/* ============================================
   1. Design System Variables
   ============================================ */

:root {
    /* Brand */
    --color-navy: #2B3444;
    --color-navy-light: #3D4654;
    --color-accent: #FDD100;
    --color-accent-soft: #FFFBEB;

    /* Core */
    --color-bg: #faf6f1;
    --color-surface: #FFFFFF;
    --color-ink: #1a1a1a;
    --color-ink-secondary: #666666;
    --color-ink-muted: #8896A8;
    --color-border: rgba(0, 0, 0, 0.1);

    /* Links */
    --color-link: #2F5B8A;

    /* Status */
    --color-success: #2ECC40;
    --color-success-bg: #F0FDF4;
    --color-error: #DC3545;
    --color-error-bg: #FEF2F2;
    --color-warning: #F59E0B;
    --color-warning-bg: #FFFBEB;

    /* Typography */
    --font-sans: 'Inter', -apple-system, sans-serif;
    --font-mono: "SF Mono", "Fira Code", Consolas, monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Layout */
    --header-height: 56px;
    --sidebar-width: 280px;
}

/* ============================================
   2. Reset & Base
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-ink);
    background: var(--color-bg);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ============================================
   3. Layout (.app, .app__body)
   ============================================ */

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.app__body {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ============================================
   4. Header Block (.header, .header__*)
   ============================================ */

.header {
    height: var(--header-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 var(--space-lg);
    gap: var(--space-lg);
}

.header__left {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header__center {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-left: auto;
}

.header__right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-left: var(--space-lg);
}

.header__divider {
    width: 1px;
    height: 24px;
    background: var(--color-border);
}

.header__title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-ink);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo__icon {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
}

.logo__text {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo__sql {
    color: var(--color-accent);
}

.logo__labs {
    color: var(--color-ink);
}

/* Difficulty Badge */
.badge {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25em 0.6em;
    background: var(--color-accent-soft);
    color: var(--color-ink);
    border-radius: var(--radius-sm);
    border-left: 2px solid var(--color-accent);
}

/* Connection Status */
.connection-status {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--color-ink-secondary);
    cursor: pointer;
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-sm);
    transition: background 0.15s;
}

.connection-status:hover {
    background: var(--color-bg);
}

.connection-status__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-success);
}

.connection-status__dot--connecting {
    background: var(--color-warning);
    animation: pulse 1.5s infinite;
}

.connection-status__dot--error {
    background: var(--color-error);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Header Tabs */
.header-tabs {
    display: flex;
    gap: 0;
}

.header-tabs__wrapper {
    position: relative;
}

.header-tabs__btn {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-ink-muted);
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
    transition: color 0.15s;
}

.header-tabs__btn:hover {
    color: var(--color-ink-secondary);
}

.header-tabs__btn--active {
    color: var(--color-ink);
}

.header-tabs__btn--active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
}

.header-tabs__btn--help {
    border-left: 1px solid var(--color-border);
    margin-left: var(--space-xs);
    padding-left: var(--space-sm);
    color: var(--color-ink-secondary);
}

/* Alpine.js cloak - hide until initialized */
[x-cloak] {
    display: none !important;
}

/* Tab Dropdown */
.tab-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 1px;
    width: 480px;
    max-height: 70vh;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    overflow: hidden;
    z-index: 100;
}

.tab-dropdown__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
}

.tab-dropdown__title {
    font-size: 0.9rem;
    font-weight: 700;
}

.tab-dropdown__close {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-ink-muted);
    cursor: pointer;
}

.tab-dropdown__close:hover {
    background: var(--color-border);
    color: var(--color-ink);
}

.tab-dropdown__content {
    padding: var(--space-md);
    max-height: calc(70vh - 60px); /* Account for header */
    overflow-y: auto;
}

.tab-dropdown--wide {
    width: 560px;
    max-width: calc(100vw - 2rem);
}

/* Connect AI Panel */
.connect-ai__lede {
    font-size: 0.85rem;
    color: var(--color-ink-secondary);
    margin-bottom: var(--space-sm);
    line-height: 1.5;
}

.connect-ai__tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-sm);
}

.connect-ai__tab {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-ink-muted);
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
}

.connect-ai__tab:hover {
    color: var(--color-ink-secondary);
}

.connect-ai__tab--active {
    color: var(--color-ink);
}

.connect-ai__tab--active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
}

.connect-ai__instructions {
    font-size: 0.82rem;
    color: var(--color-ink-secondary);
    margin-bottom: var(--space-sm);
    line-height: 1.5;
}

.connect-ai__instructions code {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    background: var(--color-border);
    padding: 1px 4px;
    border-radius: 3px;
}

.connect-ai__snippet {
    background: var(--color-navy);
    color: #e2e8f0;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.5;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin-bottom: var(--space-sm);
    white-space: pre;
    max-width: 100%;
}

.connect-ai__actions {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.connect-ai__caveat {
    font-size: 0.78rem;
    color: var(--color-ink-muted);
    line-height: 1.5;
}

.connect-ai__caveat code {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: var(--color-border);
    padding: 1px 4px;
    border-radius: 3px;
}

/* Connection Grid */
.connection-grid {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--space-sm) var(--space-md);
    align-items: center;
    font-size: 0.85rem;
}

.connection-grid__label {
    color: var(--color-ink-muted);
}

.connection-grid__value {
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.connection-grid__copy {
    padding: 0.2rem 0.4rem;
    font-size: 0.65rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-ink-muted);
}

.connection-grid__copy:hover {
    background: var(--color-accent-soft);
    border-color: var(--color-accent);
}

.connection-string {
    margin-top: var(--space-md);
    padding: var(--space-sm);
    background: var(--color-navy);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: white;
    word-break: break-all;
}

/* CSS tooltips — use data-tooltip="text" on any element.
   data-tooltip-pos="left" flips to left-anchored for right-edge elements. */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    width: max-content;
    max-width: 280px;
    white-space: normal;
    padding: 6px 10px;
    background: var(--color-navy, #1a2035);
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 400;
    line-height: 1.4;
    border-radius: 4px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s;
    z-index: 100;
    text-align: left;
}

[data-tooltip]:hover::after {
    opacity: 1;
}

[data-tooltip-pos="left"]::after {
    left: auto;
    right: 0;
    transform: none;
}

[data-tooltip-pos="bottom"]::after {
    bottom: auto;
    top: calc(100% + 6px);
}

[data-tooltip-pos="bottom-left"]::after {
    bottom: auto;
    top: calc(100% + 6px);
    left: auto;
    right: 0;
    transform: none;
}

/* Timer */
.timer {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-mono);
}

.timer--warning {
    color: var(--color-warning);
}

.timer--danger {
    color: var(--color-error);
}

.timer--grace {
    color: var(--color-error);
    animation: timer-pulse 1s ease-in-out infinite;
}

@keyframes timer-pulse {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.4; }
}

/* Toast notifications surfaced by the lab timer */
.timer-toasts {
    position: fixed;
    top: 4.5rem;
    right: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 1000;
    pointer-events: none;
}

.timer-toast {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 0.9rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: #fff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    animation: toast-in 0.2s ease-out;
    max-width: 22rem;
    pointer-events: auto;
}

.timer-toast__icon {
    font-size: 1rem;
}

.timer-toast--info    { background: #2563EB; }
.timer-toast--warning { background: var(--color-warning, #F59E0B); color: #1F2937; }
.timer-toast--danger  { background: var(--color-error, #DC3545); }

@keyframes toast-in {
    from { opacity: 0; transform: translateX(20px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* Help Section */
.help-section {
    margin-bottom: var(--space-md);
}

.help-section:last-child {
    margin-bottom: 0;
}

.help-section__header {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-ink-muted);
    margin-bottom: var(--space-sm);
}

/* Hint Items */
.hint {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
}

.hint--revealed {
    background: var(--color-accent-soft);
    border-left: 3px solid var(--color-accent);
    border-color: var(--color-accent);
}

.hint__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.hint__num {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-ink-muted);
}

.hint--revealed .hint__num {
    color: var(--color-ink);
}

.hint__content {
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--color-ink-secondary);
    margin-top: var(--space-xs);
}

.hint__content code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: var(--color-surface);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}

.hint__locked {
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    font-style: italic;
}

.hint__content pre,
.solution__content pre {
    background: var(--color-navy);
    color: #e6e6e6;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    margin: var(--space-sm) 0;
}

.hint__content pre code,
.solution__content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.hint__content h1,
.hint__content h2,
.hint__content h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin: var(--space-sm) 0 var(--space-xs);
    color: var(--color-ink);
}

.hint__content h1:first-child,
.hint__content h2:first-child {
    margin-top: 0;
}

.hint__content p {
    margin: var(--space-xs) 0;
}

.hint__content ul,
.hint__content ol {
    margin: var(--space-xs) 0;
    padding-left: var(--space-lg);
}

.hint__content li {
    margin: var(--space-xs) 0;
}

/* Solution Panel */
.solution__content {
    font-size: 0.85rem;
    line-height: 1.6;
}

.solution__content h1,
.solution__content h2,
.solution__content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: var(--space-md) 0 var(--space-xs);
}

.solution__content h1:first-child,
.solution__content h2:first-child {
    margin-top: 0;
}

.solution__content p {
    margin: var(--space-xs) 0;
}

.solution__content code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: var(--color-bg);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}

.solution__content ul,
.solution__content ol {
    margin: var(--space-xs) 0;
    padding-left: var(--space-lg);
}

.solution__content li {
    margin: var(--space-xs) 0;
}

.help-section__empty {
    font-size: 0.82rem;
    color: var(--color-ink-muted);
    font-style: italic;
}

/* Prose container for all rendered markdown (hints, solutions, description panel) */
.markdown-content {
    font-size: 0.85rem;
    line-height: 1.65;
    color: var(--color-ink-secondary);
}

.markdown-content > * + * {
    margin-top: 0.75em;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4 {
    font-weight: 700;
    color: var(--color-ink);
    line-height: 1.3;
    margin-top: 1.25em;
    margin-bottom: 0.4em;
}

.markdown-content h1 { font-size: 1.15rem; }
.markdown-content h2 { font-size: 1rem; }
.markdown-content h3 { font-size: 0.9rem; }
.markdown-content h4 { font-size: 0.85rem; }

.markdown-content p {
    margin: 0.5em 0;
}

.markdown-content ul,
.markdown-content ol {
    padding-left: 1.4em;
    margin: 0.5em 0;
}

.markdown-content li {
    margin-bottom: 0.25em;
}

.markdown-content code {
    font-family: var(--font-mono);
    font-size: 0.82em;
    background: var(--color-border);
    padding: 0.1em 0.35em;
    border-radius: 3px;
}

.markdown-content pre {
    background: var(--color-navy);
    color: #e2e8f0;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.5;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 0.75em 0;
}

.markdown-content pre code {
    background: none;
    padding: 0;
    font-size: inherit;
    color: inherit;
}

.markdown-content a {
    color: var(--color-link);
    text-decoration: underline;
}

.markdown-content a:hover {
    opacity: 0.85;
}

.markdown-content strong {
    font-weight: 700;
    color: var(--color-ink);
}

.markdown-content blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: var(--space-sm);
    color: var(--color-ink-muted);
    font-style: italic;
    margin: 0.75em 0;
}

.markdown-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 1em 0;
}

/* ============================================
   5. Sidebar Block (.sidebar, .sidebar__*)
   ============================================ */

.sidebar {
    width: var(--sidebar-width);
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* View Switcher */
.view-switcher {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    background: var(--color-navy);
}

.view-switcher__btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
    padding: 0.75rem 0.5rem;
    font-size: 0.7rem;
    font-weight: 600;
    color: rgba(255,255,255,0.6);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.15s;
}

.view-switcher__btn:hover {
    color: rgba(255,255,255,0.85);
    background: rgba(255,255,255,0.05);
}

.view-switcher__btn--active {
    color: white;
    background: rgba(255,255,255,0.1);
    box-shadow: inset 0 -2px 0 var(--color-accent);
}

.view-switcher__icon {
    font-size: 1.1rem;
}

/* Challenge Navigation */
.challenges {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.challenges__upcoming {
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
}

.challenges__label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-ink-muted);
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg);
}

.challenges__list {
    list-style: none;
    display: flex;
    flex-direction: column;
}

/* ============================================
   6. Challenge Block (.challenge, .challenge__*)
   ============================================ */

.challenge {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.75rem var(--space-md);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
    transition: all 0.15s;
}

.challenge:hover {
    background: var(--color-bg);
}

.challenge__num {
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.challenge__title {
    flex: 1;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-ink-secondary);
}

/* Challenge Modifiers */
.challenge--completed {
    background: var(--color-success-bg);
}

.challenge--completed .challenge__num {
    background: var(--color-success);
    color: white;
}

.challenge--completed .challenge__title {
    color: var(--color-ink-muted);
}

.challenge--locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.challenge--locked:hover {
    background: var(--color-surface);
}

/* Active Challenge (Expanded) */
.challenge--active {
    flex-direction: column;
    align-items: stretch;
    padding: 0;
    cursor: default;
}

.challenge--active:hover {
    background: var(--color-surface);
}

.challenge--active .challenge__num {
    background: var(--color-accent);
    color: var(--color-navy);
}

.challenge__header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.75rem var(--space-md);
    background: var(--color-accent-soft);
    border-left: 3px solid var(--color-accent);
}

.challenge__header .challenge__title {
    font-weight: 600;
    color: var(--color-ink);
}

.challenge__body {
    padding: var(--space-md);
    padding-left: calc(var(--space-md) + 3px);
    background: var(--color-surface);
    border-left: 3px solid var(--color-accent);
}

.challenge__desc {
    font-size: 0.85rem;
    color: var(--color-ink-secondary);
    line-height: 1.5;
}

.challenge__desc p {
    margin: 0 0 0.6rem 0;
}

.challenge__desc p:last-child {
    margin-bottom: 0;
}

.challenge__desc h1,
.challenge__desc h2,
.challenge__desc h3 {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-ink-muted);
    margin: 1rem 0 0.4rem 0;
    line-height: 1.2;
}

.challenge__desc h1:first-child,
.challenge__desc h2:first-child,
.challenge__desc h3:first-child {
    margin-top: 0;
}

.challenge__desc ol,
.challenge__desc ul {
    margin: 0 0 0.6rem 0;
    padding-left: 1.1rem;
}

.challenge__desc li {
    margin-bottom: 0.35rem;
    line-height: 1.5;
}

.challenge__desc li:last-child {
    margin-bottom: 0;
}

.challenge__desc strong {
    color: var(--color-ink);
    font-weight: 600;
}

.challenge__desc code {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: var(--color-accent-soft);
    padding: 0.08rem 0.3rem;
    border-radius: 3px;
    color: var(--color-ink);
    white-space: nowrap;
}

.challenge__objectives {
    list-style: none;
    margin: 0 0 var(--space-sm) 0;
    padding: 0;
}

.challenge__objective {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    font-size: 0.75rem;
    color: var(--color-ink-secondary);
    padding: 0.25rem 0;
}

.challenge__objective-check {
    width: 16px;
    flex-shrink: 0;
    text-align: center;
    color: var(--color-ink-muted);
}

.challenge__objective--done .challenge__objective-check {
    color: var(--color-success);
}

.challenge__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.challenge__tag {
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 0.2rem 0.4rem;
    background: var(--color-bg);
    border-radius: 3px;
    color: var(--color-ink-muted);
}

.challenge__footer {
    display: flex;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    padding-left: calc(var(--space-md) + 3px);
    background: var(--color-bg);
    border-left: 3px solid var(--color-accent);
}

.challenge__btn {
    flex: 1;
    padding: 0.5rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
}

.challenge__btn--primary {
    background: var(--color-navy);
    color: white;
}

.challenge__btn--primary:hover {
    background: var(--color-navy-light);
}

.challenge__btn--secondary {
    background: var(--color-surface);
    color: var(--color-ink-secondary);
    border: 1px solid var(--color-border);
}

.challenge__btn--secondary:hover {
    border-color: var(--color-ink-muted);
}

.challenge__btn--disabled,
.challenge__btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   7. Main Block (.main, .main__*)
   ============================================ */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--color-bg);
}

.main__panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.main__panel--active {
    display: flex;
    flex-direction: column;
}

/* ============================================
   8. Editor Block (.editor, .editor__*)
   ============================================ */

.editor {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-sm);
    gap: var(--space-sm);
    min-height: 0;
}

.editor__container {
    flex: 2;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    min-height: 130px;
}

.editor__textarea {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--color-ink);
    background: var(--color-surface);
    border: none;
    resize: none;
    outline: none;
}

.editor__textarea::placeholder {
    color: var(--color-ink-muted);
}

/* CodeMirror 6 integration */
.editor__container .cm-editor {
    height: 100%;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.editor__container .cm-scroller {
    padding: var(--space-sm) var(--space-md);
}

.editor__container .cm-content {
    color: var(--color-ink);
}

.editor__container .cm-gutters {
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
}

.editor__container .cm-activeLineGutter {
    background: var(--color-bg);
}

.editor__container .cm-activeLine {
    background: rgba(0, 0, 0, 0.03);
}

/* Toolbar */
.toolbar {
    display: flex;
    gap: var(--space-xs);
    align-items: center;
}

.toolbar__spacer {
    flex: 1;
}

.toolbar__divider {
    width: 1px;
    height: 18px;
    background: var(--color-border);
    margin: 0 var(--space-xs);
}

/* HTMX indicator for toolbar buttons */
.toolbar .htmx-indicator {
    display: none;
}

.htmx-request.toolbar .htmx-indicator,
.toolbar .htmx-request .htmx-indicator {
    display: inline;
}

.htmx-request.toolbar .run-label,
.toolbar .htmx-request .run-label {
    display: none;
}

/* Editor top row: editor+toolbar on left, workload panel on right */
.editor__top {
    display: flex;
    gap: var(--space-sm);
    flex: 2;
    min-height: 0;
}

.editor__left {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    min-width: 0;
}

/* ============================================
   Workload Panel (.workload)
   ============================================ */

.workload {
    width: 195px;
    flex-shrink: 0;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    font-size: 0.85rem;
}

.workload__header {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--color-border);
}

.workload__pulse {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-success);
    animation: workload-pulse 3s ease-in-out infinite;
}

@keyframes workload-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.workload__title {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-ink-muted);
}

.workload__info {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 13px;
    height: 13px;
    font-size: 0.65rem;
    font-style: normal;
    font-weight: 600;
    text-decoration: none;
    color: var(--color-ink-muted);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    cursor: help;
    margin-left: auto;
    flex-shrink: 0;
}

.workload__actor {
    padding: 3px 0;
    border-bottom: 1px solid var(--color-border);
}

.workload__actor:last-child {
    border-bottom: none;
}

.workload__actor--error .workload__actor-name {
    color: var(--color-error);
}

.workload__actor-name {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--color-ink-secondary);
    margin-bottom: 1px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xs);
}

.workload__actor-name-text {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
    flex: 1;
}

.workload__actor-sql-toggle {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.03em;
    color: var(--color-ink-muted);
    background: transparent;
    border: none;
    padding: 0 2px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 2px;
    line-height: 1;
    flex-shrink: 0;
}

.workload__actor-sql-toggle:hover {
    color: var(--color-ink);
}

.workload__actor-sql {
    margin-top: 3px;
    padding: 4px 6px;
    border-left: 2px solid var(--color-border);
    background: var(--color-bg);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    position: relative;
}

.workload__actor-sql-pre {
    margin: 0;
    padding: 0;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--color-ink-secondary);
    font-family: inherit;
    font-size: inherit;
    line-height: 1.35;
}

.workload__actor-sql-copy {
    position: absolute;
    top: 2px;
    right: 2px;
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.03em;
    color: var(--color-ink-muted);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 1px 5px;
    cursor: pointer;
    line-height: 1.2;
}

.workload__actor-sql-copy:hover {
    color: var(--color-ink);
    border-color: var(--color-ink-muted);
}

.workload__metrics {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.workload__metric {
    display: flex;
    align-items: baseline;
    gap: 1px;
}

.workload__metric-value {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.87rem;
    color: var(--color-ink);
}

.workload__metric-unit {
    font-size: 0.58rem;
    color: var(--color-ink-muted);
}

.workload__metric--error .workload__metric-value {
    color: var(--color-error);
}

.workload__metric--error .workload__metric-unit {
    color: var(--color-error);
}

.workload__metric-value--good { color: var(--color-success); }
.workload__metric-value--warn { color: var(--color-warning); }
.workload__metric-value--bad  { color: var(--color-error); }

.workload__sparkline { display: block; margin: 2px 0; }
.workload__sparkline polyline {
    fill: none;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}


/* ============================================
   9. Results Block (.results, .results__*)
   ============================================ */

.results {
    flex: 3;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    min-height: 130px;
}

.results__tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
}

.results__tab {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-ink-muted);
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
}

.results__tab:hover {
    color: var(--color-ink-secondary);
}

.results__tab--active {
    color: var(--color-ink);
    background: var(--color-surface);
}

.results__tab--active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
}

.results__badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 0.4rem;
    font-size: 0.65rem;
    font-weight: 700;
    background: var(--color-success);
    color: white;
    border-radius: 9px;
    margin-left: 0.4rem;
}

.results__badge--fail {
    background: var(--color-error);
}

.results__badge--partial {
    background: var(--color-warning);
}

.results__content {
    flex: 1;
    overflow: auto;
    position: relative;
}

/* Loading overlay shown while Run / EXPLAIN / Evaluate requests are in flight */
.results__loading {
    display: none;
    position: absolute;
    inset: 0;
    z-index: 5;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    background: color-mix(in srgb, var(--color-bg, #fff) 75%, transparent);
    backdrop-filter: blur(1px);
    font-size: 0.9rem;
    color: var(--color-text-muted, #555);
    pointer-events: none;
}

.results__loading.htmx-request {
    display: flex;
}

.results__loading-spinner {
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-border, #ccc);
    border-top-color: var(--color-primary, #2563eb);
    border-radius: 50%;
    animation: results-loading-spin 0.8s linear infinite;
}

@keyframes results-loading-spin {
    to { transform: rotate(360deg); }
}

.results__panel {
    flex-direction: column;
    flex: 1;
    overflow: auto;
}

.results__panel--active {
    display: flex;
}

/* Results Table */
.results__table {
    min-width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.results__table th {
    text-align: left;
    padding: 0.3rem 0.5rem;
    background: var(--color-bg);
    font-weight: 600;
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.results__table td {
    padding: 0.25rem 0.5rem;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-ink-secondary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.results__table tr:hover td {
    background: var(--color-accent-soft);
}

/* Command Tag (DDL/DML feedback) */
.results__command-tag {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    gap: 0.5rem;
    height: 100%;
}

.results__command-tag-text {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-ink);
}

.results__command-tag-time {
    font-size: 0.8rem;
    color: var(--color-ink-muted);
}

/* Results Footer */
.results__footer {
    padding: 0.3rem 0.5rem;
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.results__perf-metric {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.results__perf-value {
    font-weight: 600;
    font-family: var(--font-mono);
}

.results__perf-change {
    font-size: 0.7rem;
}

.results__perf-change--improved {
    color: var(--color-success);
}

.results__perf-change--worse {
    color: var(--color-error);
}

.results__perf-target {
    font-size: 0.65rem;
    padding: 0.1rem 0.3rem;
    border-radius: 3px;
}

.results__perf-target--pass {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.results__perf-target--fail {
    background: var(--color-error-bg);
    color: var(--color-error);
}

/* Messages */
.messages {
    padding: var(--space-sm);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.message {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    padding: 0.25rem 0.5rem;
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

.message__type {
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.1rem 0.3rem;
    border-radius: 2px;
    flex-shrink: 0;
}

.message--notice .message__type {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.message--info .message__type {
    background: var(--color-bg);
    color: var(--color-ink-muted);
}

.message--timing .message__type {
    background: var(--color-accent-soft);
    color: var(--color-ink);
}

/* Test Results */
.tests {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--space-sm);
}

.tests__section {
    margin-bottom: var(--space-md);
}

.tests__section:last-child {
    margin-bottom: 0;
}

.tests__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4rem 0.5rem;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-xs);
}

.tests__header-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.tests__header-stats {
    font-size: 0.75rem;
    font-weight: 700;
}

.tests__header-stats--pass {
    color: var(--color-success);
}

.tests__header-stats--partial {
    color: var(--color-warning);
}

.tests__header-stats--fail {
    color: var(--color-error);
}

.test {
    display: flex;
    align-items: baseline;
    gap: var(--space-xs);
    padding: 0.3rem 0.5rem;
    font-size: 0.85rem;
    border-radius: 2px;
}

.test--passed {
    border-left: 2px solid var(--color-success);
    background: var(--color-success-bg);
}

.test--failed {
    border-left: 2px solid var(--color-error);
    background: var(--color-error-bg);
}

.test__icon {
    flex-shrink: 0;
    width: 14px;
    font-size: 0.75rem;
}

.test__icon--pass {
    color: var(--color-success);
}

.test__icon--fail {
    color: var(--color-error);
}

.test__name {
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.test__failure {
    margin-left: 1.25rem;
    padding: 0.4rem 0.5rem;
    background: var(--color-error-bg);
    border-left: 2px solid var(--color-error);
    font-size: 0.8rem;
    font-family: var(--font-mono);
}

.test__failure-expected {
    color: var(--color-ink-secondary);
}

.test__failure-actual {
    color: var(--color-error);
}

.test__failure-hint {
    margin-top: 0.25rem;
    padding-top: 0.25rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-ink-muted);
    font-family: var(--font-sans);
    font-style: italic;
}

/* Performance Metrics Summary */
.perf-summary {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xs);
    padding: var(--space-sm);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-sm);
}

.perf-summary__card {
    text-align: center;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.perf-summary__label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-ink-muted);
}

.perf-summary__value {
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-ink);
}

.perf-summary__change {
    font-size: 0.7rem;
    font-weight: 600;
}

.perf-summary__change--pass {
    color: var(--color-success);
}

.perf-summary__change--fail {
    color: var(--color-error);
}

/* Verbose Test Results */
.perf-test {
    padding: var(--space-sm);
    margin-bottom: var(--space-xs);
    border-radius: var(--radius-sm);
}

.perf-test--passed {
    background: var(--color-success-bg);
    border-left: 3px solid var(--color-success);
}

.perf-test--failed {
    background: var(--color-error-bg);
    border-left: 3px solid var(--color-error);
}

.perf-test__title {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: var(--space-xs);
}

.perf-test__details {
    font-size: 0.8rem;
    color: var(--color-ink-secondary);
    padding-left: 1.25rem;
}

.perf-test__hint {
    margin-top: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-accent-soft);
    border-left: 2px solid var(--color-accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.75rem;
}

.perf-test__hint-label {
    font-weight: 700;
    color: var(--color-ink);
}

.perf-test__plan-node {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    background: var(--color-navy);
    color: #e2e8f0;
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    margin: 0.25rem 0;
    display: inline-block;
}

/* ============================================
   9b. EXPLAIN Block (.explain, .explain__*)
   ============================================ */

.explain {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.explain__tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    padding: 0 var(--space-sm);
}

.explain__tab {
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-ink-muted);
    background: none;
    border: none;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
}

.explain__tab:hover {
    color: var(--color-ink-secondary);
}

.explain__tab--active {
    color: var(--color-ink);
    border-bottom-color: var(--color-accent);
}

.explain__panel {
    flex: 1;
    overflow: auto;
    padding: var(--space-md);
}

/* Explain Summary */
.explain-summary {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.explain-verdict {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.explain-verdict--pass {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.explain-verdict--warn {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.explain-verdict--fail {
    background: var(--color-error-bg);
    color: var(--color-error);
}

.explain-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
}

.explain-metric {
    background: var(--color-bg);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    text-align: center;
}

.explain-metric__label {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--color-ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.explain-metric__value {
    font-size: 1.1rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-ink);
}

.explain-metric__detail {
    font-size: 0.65rem;
    color: var(--color-ink-muted);
    font-family: var(--font-mono);
}

/* Issues */
.explain-issues {
    background: var(--color-warning-bg);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-warning);
}

.explain-section__title {
    font-size: 0.75rem;
    font-weight: 600;
    margin: 0 0 var(--space-sm) 0;
    color: var(--color-ink);
}

.explain-issues__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.explain-issue {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    font-size: 0.8rem;
    padding: 0.2rem 0;
    color: var(--color-ink-secondary);
}

.explain-issue__icon {
    width: 14px;
    height: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-warning);
    color: white;
    border-radius: 50%;
    font-size: 0.6rem;
    font-weight: 700;
    flex-shrink: 0;
}

/* Suggestions */
.explain-suggestions {
    background: var(--color-accent-soft);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
}

.explain-suggestions__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.explain-suggestion {
    padding: 0.2rem 0;
}

.explain-suggestion code {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: var(--color-surface);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    display: block;
}

/* Text Plan */
.explain-text {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
    margin: 0;
    padding: var(--space-md);
    background: var(--color-navy);
    color: #e2e8f0;
    border-radius: var(--radius-sm);
    overflow-x: auto;
}

/* Tree View */
.explain-tree {
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.explain-tree__node {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    padding: 0.25rem 0;
    flex-wrap: wrap;
}

.explain-tree__toggle {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.7rem;
    font-weight: 700;
    flex-shrink: 0;
    color: var(--color-ink-muted);
}

.explain-tree__toggle:hover {
    background: var(--color-surface);
    color: var(--color-ink);
}

.explain-tree__toggle-spacer {
    width: 16px;
    flex-shrink: 0;
}

.explain-tree__type {
    font-weight: 600;
    color: var(--color-ink);
}

.explain-tree__relation,
.explain-tree__index {
    color: var(--color-ink-secondary);
}

.explain-tree__stats {
    color: var(--color-ink-muted);
    font-size: 0.7rem;
}

.explain-tree__details {
    width: 100%;
    margin-top: 0.15rem;
}

.explain-tree__detail {
    font-size: 0.7rem;
    color: var(--color-ink-secondary);
    padding: 0.1rem 0;
}

/* Node type color coding */
.explain-node--seqscan .explain-tree__type {
    color: var(--color-warning);
}

.explain-node--index .explain-tree__type {
    color: var(--color-success);
}

.explain-node--hash .explain-tree__type {
    color: #6366F1;
}

.explain-node--sort .explain-tree__type {
    color: #8B5CF6;
}

.explain-node--aggregate .explain-tree__type {
    color: #EC4899;
}

.explain-node--nestedloop .explain-tree__type {
    color: #F97316;
}

/* Error display */
.explain-error {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--color-error-bg);
    border-radius: var(--radius-sm);
    color: var(--color-error);
}

.explain-error__icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-error);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.8rem;
    flex-shrink: 0;
}

/* HTMX indicator for explain button */
.htmx-request .explain-label {
    display: none;
}

.explain-indicator {
    display: none;
}

.htmx-request .explain-indicator {
    display: inline;
}

/* HTMX indicator for evaluate button */
.htmx-request .evaluate-label {
    display: none;
}

.evaluate-indicator {
    display: none;
}

.htmx-request .evaluate-indicator {
    display: inline;
}

/* Disabled toolbar buttons during HTMX requests */
.toolbar button[disabled],
.toolbar button.htmx-request {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Explain Diff Indicators */

.explain-metric__change {
    font-size: 0.85rem;
    font-weight: 700;
    margin-top: 4px;
    padding: 2px 8px;
    border-radius: 4px;
    display: inline-block;
    color: var(--color-ink-secondary);
    background: var(--color-surface-alt, rgba(0,0,0,0.04));
}

.explain-metric__change--improved {
    color: #15803d;
    background: var(--color-success-bg);
}

.explain-metric__change--worse {
    color: #b91c1c;
    background: var(--color-error-bg);
}

.explain-diff-summary {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    background: var(--color-surface-alt, var(--color-surface));
    border: 1px solid var(--color-border);
}

.explain-diff-summary--improved {
    background: var(--color-success-bg);
    border-color: var(--color-success);
    color: #15803d;
}

.explain-diff-summary--mixed {
    background: #FFFBEB;
    border-color: #F59E0B;
    color: #92400E;
}

.explain-structural {
    margin-top: var(--space-md);
}

.explain-structural__note {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.85rem;
    font-weight: 500;
    border-left: 3px solid var(--color-border);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: var(--space-xs);
    background: var(--color-surface);
}

.explain-structural__note--improved {
    border-left-color: var(--color-success);
    color: #15803d;
    background: var(--color-success-bg);
}

.explain-structural__note--regressed {
    border-left-color: var(--color-error);
    color: #b91c1c;
    background: var(--color-error-bg);
}

.explain-verdict__clear-baseline {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--color-ink-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
}

.explain-verdict__clear-baseline:hover {
    color: var(--color-ink);
}

.explain-baseline-cleared {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    color: var(--color-ink-secondary);
    font-size: 0.9rem;
}

.explain-baseline-cleared__icon {
    color: var(--color-success);
    font-weight: 700;
}

/* ============================================
   10. Description Panel (.description)
   ============================================ */

.description {
    padding: var(--space-lg);
    overflow-y: auto;
    background: var(--color-surface);
    margin: var(--space-sm);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.description h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

.description h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
}

.description p {
    font-size: 0.95rem;
    color: var(--color-ink-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.description ul,
.description ol {
    margin: var(--space-sm) 0 var(--space-md);
    padding-left: var(--space-lg);
}

.description li {
    font-size: 0.95rem;
    color: var(--color-ink-secondary);
    line-height: 1.7;
    margin: var(--space-xs) 0;
}

.description code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--color-accent-soft);
    padding: 0.2em 0.5em;
    border-radius: 4px;
}

.description pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.description pre {
    background: var(--color-navy);
    color: #e2e8f0;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: var(--space-md) 0;
}

.description .callout {
    background: var(--color-accent-soft);
    border-left: 4px solid var(--color-accent);
    padding: var(--space-md) var(--space-lg);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: var(--space-lg) 0;
}

.description .callout__title {
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.description .callout p {
    margin-bottom: 0;
}

/* ============================================
   10b. Schema Panel (.schema)
   ============================================ */

.schema {
    padding: var(--space-lg);
    overflow-y: auto;
    background: var(--color-surface);
    margin: var(--space-sm);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.schema__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}

.schema__title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0;
}

.schema__empty {
    color: var(--color-ink-secondary);
    font-size: 0.95rem;
    padding: var(--space-lg);
    text-align: center;
}

/* Schema selector */
.schema-selector {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.schema-selector__label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-ink-secondary);
    margin-right: var(--space-xs);
}

.schema-selector__btn {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    padding: 3px 10px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-ink-secondary);
    cursor: pointer;
    transition: all 0.15s;
}

.schema-selector__btn:hover {
    border-color: var(--color-accent);
    color: var(--color-ink);
}

.schema-selector__btn--active {
    background: var(--color-navy);
    color: #e2e8f0;
    border-color: var(--color-navy);
}

/* Enum types section */
.schema-enums {
    border-left: 3px solid var(--color-accent);
    padding: var(--space-sm) var(--space-md);
    margin-bottom: var(--space-lg);
    background: var(--color-accent-soft);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.schema-enums__title {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-ink-secondary);
    margin: 0 0 var(--space-xs) 0;
}

.schema-enums__item {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    padding: 2px 0;
    font-size: 0.9rem;
}

.schema-enums__name {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-ink);
}

.schema-enums__values {
    color: var(--color-ink-secondary);
    font-family: var(--font-mono);
    font-size: 0.85em;
}

/* Table cards */
.schema-table {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    overflow: hidden;
}

.schema-table__header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-navy);
    color: #e2e8f0;
    cursor: pointer;
    user-select: none;
}

.schema-table__header:hover {
    opacity: 0.9;
}

.schema-table__toggle {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    width: 1.2em;
    text-align: center;
    flex-shrink: 0;
}

.schema-table__name {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.95rem;
}

.schema-table__count {
    margin-left: auto;
    font-size: 0.8rem;
    opacity: 0.7;
}

.schema-table__body {
    padding: 0;
}

/* Column table */
.schema-table__columns {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.schema-table__columns th {
    text-align: left;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-ink-secondary);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
}

.schema-table__columns td {
    padding: var(--space-xs) var(--space-sm);
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}

.schema-table__columns td code {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.schema-table__columns tr:last-child td {
    border-bottom: none;
}

.schema-col--pk {
    background: rgba(59, 130, 246, 0.05);
}

.schema-col__nullable {
    color: var(--color-ink-secondary);
    font-size: 0.85em;
}

.schema-col__not-null {
    font-weight: 600;
    font-size: 0.85em;
}

.schema-col__default {
    font-size: 0.85em;
    color: var(--color-ink-secondary);
}

/* Key badges */
.schema-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 3px;
    margin-right: 2px;
    letter-spacing: 0.02em;
}

.schema-badge--pk {
    background: #3b82f6;
    color: #fff;
}

.schema-badge--fk {
    background: #8b5cf6;
    color: #fff;
    cursor: help;
}

.schema-badge--unique {
    background: #f59e0b;
    color: #fff;
}

/* Indexes section */
.schema-table__indexes {
    padding: var(--space-sm) var(--space-md);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
}

.schema-table__indexes-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-ink-secondary);
    margin: 0 0 var(--space-xs) 0;
}

.schema-table__index {
    display: flex;
    flex-direction: column;
    gap: 1px;
    padding: 2px 0;
    font-size: 0.8rem;
}

.schema-table__index-name {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-ink);
}

.schema-table__index-def {
    font-family: var(--font-mono);
    color: var(--color-ink-secondary);
    font-size: 0.9em;
}

/* Schema error */
.schema-error {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
    color: #dc2626;
}

.schema-error__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: #dc2626;
    color: #fff;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.schema-error__message {
    font-size: 0.9rem;
}

/* Challenge Header */
.challenge-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.challenge-header__badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--color-accent);
    color: var(--color-ink);
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    transform: translateY(-8px);
}

.challenge-header__title {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0;
    color: var(--color-ink);
    letter-spacing: -0.02em;
    line-height: 28px;
}

/* Objectives Section */
.objectives {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-lg);
}

.objectives__title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-ink-muted);
    margin: 0 0 var(--space-sm) 0 !important;
}

.objectives__list {
    list-style: disc;
    margin: 0;
    padding-left: var(--space-lg);
}

.objectives__item {
    padding: var(--space-xs) 0;
    font-size: 0.9rem;
    color: var(--color-ink-secondary);
}

/* ============================================
   11. Buttons (.btn, .btn--*)
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.45rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    font-family: inherit;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s;
    border: none;
}

.btn--sm {
    padding: 0.35rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.btn--primary {
    background: var(--color-accent);
    color: var(--color-navy);
}

.btn--primary:hover {
    filter: brightness(1.05);
    transform: translateY(-1px);
}

.btn--secondary {
    background: var(--color-surface);
    color: var(--color-ink);
    border: 1px solid var(--color-border);
}

.btn--secondary:hover {
    border-color: var(--color-ink-muted);
    background: var(--color-bg);
}

.btn--success {
    background: var(--color-success);
    color: white;
}

.btn--exit {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-ink-secondary);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.btn--exit:hover {
    border-color: var(--color-ink-muted);
    color: var(--color-ink);
}

.btn--reveal {
    padding: 0.3rem 0.6rem;
    font-size: 0.7rem;
    font-weight: 600;
    background: var(--color-accent);
    color: var(--color-navy);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

/* ============================================
   12. Utility Classes
   ============================================ */

.hidden {
    display: none !important;
}

/* ============================================
   13. Lab Landing Page (.hero, .pitch, .cta-box)
   ============================================ */

/* Override body for landing pages */
body:has(.hero) {
    height: auto;
    overflow: auto;
}

/* Landing page header (different from session header) */
body:has(.hero) .header,
body:has(.status-main) .header,
body:has(.error-main) .header {
    padding: 1.5rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: auto;
    position: static;
    background: none;
    border: none;
}

body:has(.hero) .logo,
body:has(.status-main) .logo,
body:has(.error-main) .logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    object-fit: cover;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo-sql {
    color: var(--color-accent);
}

.logo-labs {
    color: var(--color-ink);
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-ink-secondary);
    text-decoration: none;
}

.nav a:hover {
    color: var(--color-ink);
}

.hero {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 2rem 3rem;
}

.hero-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-navy);
    background: var(--color-accent-soft);
    border-left: 3px solid var(--color-accent);
    padding: 0.4em 0.75em;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.035em;
    margin-bottom: 1.25rem;
    max-width: 700px;
}

.hero-title em {
    font-style: normal;
    color: var(--color-navy);
    position: relative;
    white-space: nowrap;
}

.hero-title em::before {
    content: '';
    position: absolute;
    left: -0.15em;
    right: -0.15em;
    bottom: 0.15em;
    height: 0.4em;
    background: var(--color-accent);
    border-radius: 2px 12px 4px 8px;
    transform: skewX(-8deg) rotate(-1deg);
    z-index: -1;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-ink-secondary);
    max-width: 820px;
    line-height: 1.5;
    margin-bottom: 2rem;
}

.hero-subtitle code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: rgba(0, 0, 0, 0.06);
    padding: 0.08rem 0.36rem;
    border-radius: 4px;
    color: var(--color-ink);
    white-space: nowrap;
}

.pitch {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--color-navy);
}

.pitch-main {
    flex: 1;
}

.pitch-aside {
    width: 320px;
    flex-shrink: 0;
}

/* The Deal */
.the-deal {
    margin-bottom: 3rem;
}

.deal-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-ink-muted);
    margin-bottom: 1.5rem;
}

.deal-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.deal-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.25rem;
}

.deal-item__icon {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.deal-item__title {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.deal-item__text {
    font-size: 0.8rem;
    color: var(--color-ink-secondary);
    line-height: 1.45;
}

/* Challenges */
.challenges {
    margin-bottom: 2.5rem;
}

.challenges-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
}

.challenges-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-ink-muted);
}

.challenges-count {
    font-size: 0.8rem;
    color: var(--color-ink-muted);
}

.challenge-list {
    list-style: none;
    border: 2px solid var(--color-navy);
    border-radius: 12px;
    overflow: hidden;
}

.challenge-item {
    display: flex;
    align-items: center;
    padding: 1.1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
    cursor: pointer;
    transition: all 0.15s;
}

.challenge-item:last-child {
    border-bottom: none;
}

.challenge-item:hover {
    background: var(--color-accent-soft);
    padding-left: 1.5rem;
}

.challenge-item:hover .challenge-num {
    background: var(--color-accent);
    color: var(--color-navy);
}

.challenge-num {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 800;
    margin-right: 1rem;
    transition: all 0.15s;
}

.challenge-content {
    flex: 1;
}

.challenge-title {
    font-size: 1rem;
    font-weight: 600;
}

.challenge-hint {
    font-size: 0.8rem;
    color: var(--color-ink-muted);
    margin-top: 0.15rem;
}

/* Opinion Box */
.opinion-box {
    background: var(--color-accent-soft);
    border-left: 4px solid var(--color-accent);
    padding: 1.25rem 1.5rem;
    border-radius: 0 10px 10px 0;
}

.opinion-box__title {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.opinion-box__text {
    font-size: 0.875rem;
    color: var(--color-ink-secondary);
    line-height: 1.55;
}

.opinion-box__text strong {
    color: var(--color-ink);
}

.opinion-box__text p {
    margin: 0 0 0.75rem 0;
}

.opinion-box__text p:last-child {
    margin-bottom: 0;
}

.opinion-box__text code {
    font-family: var(--font-mono);
    font-size: 0.82em;
    background: rgba(0, 0, 0, 0.06);
    padding: 0.08rem 0.32rem;
    border-radius: 3px;
    color: var(--color-ink);
}

/* Centered landing page (homepage) */
body.landing {
    height: auto;
    min-height: 100vh;
    overflow: auto;
    margin: 0;
    background:
        radial-gradient(at 20% 20%, rgba(253, 209, 0, 0.10) 0px, transparent 50%),
        radial-gradient(at 80% 80%, rgba(43, 52, 68, 0.06) 0px, transparent 50%),
        var(--color-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
}

.landing-page {
    width: 100%;
    max-width: 520px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1.5rem;
}

.landing-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 2.25rem 2rem;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
    text-align: center;
}

.landing-card__logo {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1.5rem;
    text-decoration: none;
}

.landing-card__logo .logo-icon {
    width: 40px;
    height: 40px;
}

.landing-card__logo .logo-text {
    font-size: 1.4rem;
}

.landing-card__title {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-ink);
    margin: 0 0 1rem 0;
    line-height: 1.2;
}

.landing-card__lede {
    font-size: 0.95rem;
    color: var(--color-ink-secondary);
    line-height: 1.6;
    margin: 0 0 1rem 0;
    text-align: left;
}

.landing-card__lede:last-of-type {
    margin-bottom: 1.5rem;
}

.landing-card__lede code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--color-accent-soft);
    padding: 0.05rem 0.32rem;
    border-radius: 3px;
    color: var(--color-ink);
}

.landing-footer {
    text-align: center;
    color: var(--color-ink-muted);
    font-size: 0.85rem;
    line-height: 1.5;
}

.landing-footer p {
    margin: 0 0 0.35rem 0;
}

.landing-footer a {
    color: var(--color-link);
    text-decoration: none;
}

.landing-footer a:hover {
    text-decoration: underline;
}

.landing-footer__small {
    font-size: 0.78rem;
    color: var(--color-ink-muted);
}

/* Newsletter signup */
.newsletter {
    padding: 1.25rem 1.25rem 1rem;
    background: var(--color-accent-soft);
    border: 1px solid rgba(253, 209, 0, 0.4);
    border-radius: 12px;
    text-align: left;
}

.newsletter__title {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 0.3rem 0;
    color: var(--color-ink);
}

.newsletter__lede {
    font-size: 0.85rem;
    color: var(--color-ink-secondary);
    margin: 0 0 0.85rem 0;
}

.newsletter__form {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.newsletter__input {
    flex: 1;
    padding: 0.7rem 0.9rem;
    font-size: 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-bg);
    color: var(--color-ink);
    font-family: inherit;
}

.newsletter__input:focus {
    outline: none;
    border-color: var(--color-navy);
    background: var(--color-surface);
}

.newsletter__button {
    padding: 0.7rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 700;
    background: var(--color-accent);
    color: var(--color-navy);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: filter 0.15s;
}

.newsletter__button:hover {
    filter: brightness(0.95);
}

.newsletter__fine-print {
    font-size: 0.78rem;
    color: var(--color-ink-muted);
    margin: 0;
}

.newsletter__fine-print a {
    color: var(--color-link);
    text-decoration: underline;
}

/* Legal pages (privacy, terms) */
.legal-page {
    width: 100%;
    max-width: 760px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.legal-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    margin-top: 0.5rem;
}

.legal-logo .logo-icon {
    width: 32px;
    height: 32px;
}

.legal-card {
    width: 100%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
    overflow: hidden;
}

.legal-card__head {
    padding: 2rem 2.5rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-accent-soft);
}

.legal-card__title {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--color-ink);
    letter-spacing: -0.02em;
    margin: 0 0 0.35rem 0;
}

.legal-card__date {
    font-size: 0.9rem;
    color: var(--color-ink-secondary);
    margin: 0;
}

.legal-card__body {
    padding: 2rem 2.5rem 2.25rem;
    max-width: none;
}

/* Prose (legal pages, etc.) */
.prose {
    max-width: 720px;
    font-size: 0.98rem;
    line-height: 1.65;
    color: var(--color-ink-secondary);
}

.prose p {
    margin: 0 0 1rem 0;
}

.prose h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-ink);
    margin: 2rem 0 0.75rem 0;
}

.prose ul {
    margin: 0 0 1rem 0;
    padding-left: 1.25rem;
}

.prose li {
    margin-bottom: 0.4rem;
}

.prose strong {
    color: var(--color-ink);
}

.prose a {
    color: var(--color-link);
    text-decoration: underline;
}

/* CTA Box */
.cta-box {
    background: var(--color-navy);
    color: white;
    padding: 2rem;
    border-radius: 12px;
}

.cta-box--success {
    background: var(--color-success-bg);
    color: var(--color-ink);
    text-align: center;
}

.cta-box--success .cta-box__icon {
    font-size: 3rem;
    color: var(--color-success);
    margin-bottom: 1rem;
}

.cta-box--error {
    background: var(--color-error-bg);
    color: var(--color-ink);
    text-align: center;
}

.cta-box--error .cta-box__icon {
    font-size: 3rem;
    color: var(--color-error);
    margin-bottom: 1rem;
}

.cta-box--warning {
    background: var(--color-warning-bg);
    color: var(--color-ink);
    text-align: center;
}

.cta-box--warning .cta-box__icon {
    font-size: 3rem;
    color: var(--color-warning);
    margin-bottom: 1rem;
}

.cta-box__label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

.cta-box__title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.cta-box__text {
    font-size: 0.9rem;
    color: #9CA3AF;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.cta-box--success .cta-box__text,
.cta-box--error .cta-box__text,
.cta-box--warning .cta-box__text {
    color: var(--color-ink-secondary);
}

.cta-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.cta-input {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--color-navy-light);
    color: white;
}

.cta-input::placeholder {
    color: #6B7280;
}

.cta-input:focus {
    outline: 2px solid white;
    outline-offset: 2px;
}

.cta-button {
    width: 100%;
    padding: 1rem;
    background: var(--color-accent);
    color: var(--color-navy);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: transform 0.1s, filter 0.15s;
    position: relative;
}

.cta-button:hover {
    transform: scale(1.02);
    filter: brightness(1.05);
}

.cta-button:active {
    transform: scale(0.98);
}

.cta-button .htmx-indicator {
    display: none;
}

.htmx-request .cta-button .htmx-indicator {
    display: inline;
}

.htmx-request .cta-button .cta-button-text {
    display: none;
}

.cta-fine {
    margin-top: 1rem;
    font-size: 0.75rem;
    color: #6B7280;
    text-align: center;
}

.cta-box--success .cta-fine,
.cta-box--error .cta-fine,
.cta-box--warning .cta-fine {
    color: var(--color-ink-muted);
}

/* Footer */
.footer {
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem 2rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-brand .logo-icon {
    width: 24px;
    height: 24px;
    border-radius: 6px;
}

.footer-brand .logo-text {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.footer-tagline {
    font-size: 0.8rem;
    color: var(--color-ink-muted);
    margin-top: 0.25rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    font-size: 0.8rem;
    color: var(--color-ink-muted);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--color-ink);
}

/* ============================================
   14. Status Page (.status-*)
   ============================================ */

.status-main {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--header-height));
    padding: 2rem;
}

.status-container {
    width: 100%;
    max-width: 480px;
}

.status-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
}

.status-icon {
    margin-bottom: 1.5rem;
}

.status-icon--ready {
    color: var(--color-success);
}

.status-icon--pending {
    color: var(--color-ink-muted);
}

.status-icon--provisioning {
    color: var(--color-accent);
}

.status-icon-svg {
    width: 64px;
    height: 64px;
}

.status-icon-svg--spin {
    animation: spin 2s linear infinite;
}

.status-tip {
    margin: 0 auto 1.75rem;
    max-width: 380px;
    background: #1e1e1e;
    border: 1px solid #2a2a2a;
    border-radius: 8px;
    text-align: left;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

.status-tip__chrome {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: #2a2a2a;
    border-bottom: 1px solid #353535;
}

.status-tip__dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.status-tip__dot--r { background: #ff5f56; }
.status-tip__dot--y { background: #ffbd2e; }
.status-tip__dot--g { background: #27c93f; }

.status-tip__label {
    margin-left: 8px;
    font-size: 0.72rem;
    color: #8a8a8a;
    letter-spacing: 0.02em;
}

.status-tip__body {
    margin: 0;
    padding: 14px 16px;
    color: #d4d4d4;
    font-size: 0.78rem;
    line-height: 1.55;
    white-space: pre-wrap;
    word-break: break-word;
}

.status-tip__comment {
    color: #6a9955;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.status-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.status-message {
    font-size: 1rem;
    color: var(--color-ink-secondary);
    margin-bottom: 2rem;
}

.status-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.status-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid #e5e5e5;
    border-top-color: var(--color-accent);
    border-right-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s ease-in-out infinite;
}

.status-state {
    font-size: 0.9rem;
    color: var(--color-ink-muted);
}

.status-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--color-accent);
    color: var(--color-navy);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    transition: transform 0.1s, filter 0.15s;
}

.status-button:hover {
    transform: scale(1.02);
    filter: brightness(1.05);
}

/* ============================================
   15. Error Pages (.error-*)
   ============================================ */

.error-main {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--header-height));
    padding: 2rem;
}

.error-container {
    text-align: center;
    max-width: 480px;
}

.error-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
}

.error-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.error-message {
    font-size: 1rem;
    color: var(--color-ink-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.error-message code {
    background: var(--color-bg);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.error-button {
    display: inline-block;
    padding: 0.875rem 1.5rem;
    background: var(--color-navy);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.1s, filter 0.15s;
}

.error-button:hover {
    transform: scale(1.02);
    filter: brightness(1.1);
}

.copy-link-container {
    display: flex;
    gap: 0.5rem;
    margin: 1.5rem 0;
    max-width: 100%;
}

.copy-link-input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    background: var(--color-navy);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    color: var(--color-text-muted);
    min-width: 0;
}

.copy-link-btn {
    padding: 0.75rem 1.25rem;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: filter 0.15s;
}

.copy-link-btn:hover {
    filter: brightness(1.1);
}

/* ============================================
   16. Responsive
   ============================================ */

@media (max-width: 900px) {
    .pitch {
        flex-direction: column;
    }

    .pitch-aside {
        width: 100%;
        order: -1;
    }

    .deal-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 2.25rem;
    }
}

@media (max-width: 600px) {
    .header {
        padding: 1rem;
    }

    .hero {
        padding: 1rem 1rem 2rem;
    }

    .hero-title {
        font-size: 1.85rem;
    }

    .nav {
        display: none;
    }

    .footer {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
}

/* ============================================
   Migration Terminal
   ============================================ */

.btn--migrate {
    background: var(--color-accent);
    color: var(--color-navy);
}

.btn--migrate:hover {
    filter: brightness(1.05);
    transform: translateY(-1px);
}

.migration-terminal {
    display: none;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    /* Match .results flex properties to maintain layout */
    flex: 3;
    min-height: 130px;
}

.migration-terminal.active {
    display: flex;
}

.migration-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-navy);
    color: white;
}

.migration-header.running {
    background: #3B82F6;
}

.migration-header.blocking {
    background: var(--color-error);
    animation: pulse-bg 1s infinite;
}

.migration-header.success {
    background: var(--color-success);
}

.migration-header.failed {
    background: var(--color-error);
}

@keyframes pulse-bg {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.85; }
}

.migration-status {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 0.85rem;
}

.migration-info {
    display: flex;
    gap: var(--space-md);
    font-size: 0.75rem;
    opacity: 0.9;
}

.btn-cancel {
    padding: 0.4rem 0.8rem;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(255,255,255,0.2);
    color: white;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.btn-cancel:hover {
    background: rgba(255,255,255,0.3);
}

.migration-header.success .btn-cancel,
.migration-header.failed .btn-cancel {
    background: white;
    color: var(--color-ink);
    border-color: white;
}

.terminal {
    flex: 1;
    background: #1a1d24;
    padding: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.6;
    color: #e2e8f0;
    overflow-y: auto;
    min-height: 150px;
}

.terminal-line {
    margin-bottom: 0.25rem;
}

.terminal-line.command { color: #94a3b8; }
.terminal-line.statement { color: #e2e8f0; }
.terminal-line.success { color: var(--color-success); }
.terminal-line.error { color: var(--color-error); }
.terminal-line.warning { color: var(--color-warning); }
.terminal-line.muted { color: #64748b; }
.terminal-line.indent { padding-left: 1.5rem; }

.terminal-blocking {
    margin: var(--space-sm) 0;
    padding: var(--space-sm);
    background: rgba(220, 53, 69, 0.2);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-sm);
    color: var(--color-error);
}

.terminal-blocking-title {
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.terminal-progress {
    display: flex;
    gap: 2px;
    margin-top: 0.25rem;
    padding-left: 1.5rem;
}

.terminal-progress-block {
    width: 8px;
    height: 12px;
    background: #3B82F6;
    border-radius: 1px;
    animation: progress-pulse 0.8s ease-in-out infinite;
}

.terminal-progress-block:nth-child(2) { animation-delay: 0.1s; }
.terminal-progress-block:nth-child(3) { animation-delay: 0.2s; }
.terminal-progress-block:nth-child(4) { animation-delay: 0.3s; }
.terminal-progress-block:nth-child(5) { animation-delay: 0.4s; }

@keyframes progress-pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* Actor Status Bar */
.actor-status-bar {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: #0f1115;
    border-top: 1px solid #2a2f38;
    font-size: 0.75rem;
    color: #94a3b8;
}

.actor-status-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.actor-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-success);
}

.actor-dot.blocked {
    background: var(--color-error);
    animation: pulse 1s infinite;
}

.actor-name {
    font-weight: 500;
    color: #e2e8f0;
}

.actor-stats {
    color: #64748b;
}

.actor-stats.blocked {
    color: var(--color-error);
}

/* Migration Results in Terminal */
.terminal-results {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid #2a2f38;
}

.terminal-result-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.25rem 0;
}

.terminal-result-item.pass { color: var(--color-success); }
.terminal-result-item.fail { color: var(--color-error); }

/* =============================================================================
   SQL-Themed Error Pages
   ============================================================================= */

.error-container--sql {
    text-align: left;
    max-width: 560px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.error-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 0.375rem 0.75rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
}

.error-badge--warning {
    background: var(--color-warning);
    color: #000;
}

.error-badge--error {
    background: var(--color-error);
    color: #fff;
}

.error-sql {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    background: var(--color-bg);
    border-radius: 6px;
    padding: 1.25rem;
}

.error-sql__line {
    margin: 0;
    white-space: pre-wrap;
}

.error-sql__line--code {
    color: var(--color-ink-muted);
}

.error-sql__line--caret {
    color: var(--color-error);
    font-weight: 700;
}

.error-sql__label {
    color: var(--color-error);
    font-weight: 600;
}

/* ============================================
   Session Summary Page (end-of-lab)
   ============================================ */

.summary {
    min-height: 100vh;
    background: var(--color-bg);
    padding: var(--space-xl) var(--space-md);
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.summary__container {
    width: 100%;
    max-width: 720px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.summary__hero {
    padding: var(--space-xl);
    text-align: center;
    color: #fff;
}

.summary__hero--completed { background: linear-gradient(135deg, #16A34A, #15803D); }
.summary__hero--expired   { background: linear-gradient(135deg, #DC2626, #B91C1C); }
.summary__hero--ended     { background: linear-gradient(135deg, #475569, #334155); }

.summary__icon {
    font-size: 2.75rem;
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.summary__title {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 0 0.35rem;
}

.summary__lab {
    margin: 0;
    font-size: 0.95rem;
    opacity: 0.85;
}

.summary__lead {
    margin: 0.5rem 0 0;
    font-size: 0.95rem;
    opacity: 0.9;
}

.summary__stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1px;
    background: var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.summary__stat {
    background: var(--color-surface);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    text-align: center;
}

.summary__stat-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-ink-muted);
}

.summary__stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-ink);
}

.summary__stat-sub {
    font-size: 0.75rem;
    color: var(--color-ink-muted);
}

.summary__challenges {
    padding: var(--space-lg) var(--space-xl);
}

.summary__section-title {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-ink-muted);
    margin: 0 0 var(--space-md);
}

.summary-challenge-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.summary-challenge {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
}

.summary-challenge--done {
    border-color: rgba(22, 163, 74, 0.4);
}

.summary-challenge__check {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    background: var(--color-surface);
    color: var(--color-ink-muted);
    border: 1px solid var(--color-border);
}

.summary-challenge__check--done {
    background: #16A34A;
    color: #fff;
    border-color: #16A34A;
}

.summary-challenge__body {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    flex: 1;
    min-width: 0;
}

.summary-challenge__title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-ink);
}

.summary-challenge__meta {
    font-size: 0.8rem;
    color: var(--color-ink-muted);
}

.summary__actions {
    display: flex;
    gap: var(--space-sm);
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
    flex-wrap: wrap;
}

.summary__actions .btn {
    flex: 1;
    min-width: 160px;
    text-align: center;
    text-decoration: none;
}

.summary__footnote {
    margin: 0;
    padding: 0 var(--space-xl) var(--space-lg);
    background: var(--color-bg);
    font-size: 0.75rem;
    color: var(--color-ink-muted);
    text-align: center;
}