/* ============================================
   PyVisualizer Website - Premium CSS Design
   ============================================ */

/* CSS Custom Properties
   ------------------------------------------------------------------
   The palette is the tool's own vocabulary. Every call edge this
   project emits is labelled resolved / inherited / ambiguous, so those
   three confidence levels ARE the semantic colour system — verified
   green, inherited amber, ambiguous rust. Neutrals carry a slight
   green bias so they read as chosen rather than inherited grey.
   ------------------------------------------------------------------ */
:root {
    /* Brand — "resolved" green */
    --primary: #14624A;
    --primary-light: #1C8462;
    --primary-dark: #0C3E2F;
    --secondary: #275E6E;
    --secondary-light: #3B8095;
    --accent: #14624A;
    --accent-light: #1C8462;
    --warning: #8A5C0A;
    --danger: #8C3322;

    /* Confidence semantics — mirrors CONFIDENCE_* in pyvisualizer/core/model.py */
    --confidence-resolved: #14624A;
    --confidence-inherited: #8A5C0A;
    --confidence-ambiguous: #8C3322;

    /* Neutrals — green-biased, not pure grey */
    --gray-50: #F7F8F5;
    --gray-100: #EFF1EC;
    --gray-200: #E3E6DF;
    --gray-300: #D3D8CE;
    --gray-400: #B4BBB1;
    --gray-500: #8B948B;
    --gray-600: #5F6963;
    --gray-700: #414A45;
    --gray-800: #2A322E;
    --gray-900: #161A18;

    /* Theme colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F7F8F5;
    --bg-tertiary: #EFF1EC;
    --bg-card: #FFFFFF;
    --text-primary: #161A18;
    --text-secondary: #5F6963;
    --text-muted: #79837C;
    --border-color: #E3E6DF;
    --shadow-color: rgba(20, 40, 32, 0.07);
    --shadow-color-strong: rgba(20, 40, 32, 0.14);

    /* Tinted surfaces — theme-safe replacements for hard-coded rgba() */
    --surface-sunken: #F7F8F5;
    --surface-raised: #FFFFFF;
    --rule-soft: rgba(22, 26, 24, 0.09);
    --accent-wash: rgba(20, 98, 74, 0.07);

    /* Terminal surface — identical in both themes on purpose: a terminal
       is a terminal. Tokenised so pages stop hard-coding #0d1117. */
    --term-bg: #10221C;
    --term-fg: #DCE8E2;
    --term-border: #24443A;
    --term-prompt: #4FBF95;
    --term-ok: #4FBF95;
    --term-warn: #D9A441;
    --term-bad: #E3866F;

    /* Ambient wash (index hero) — single hue, low saturation */
    --aurora-1: rgba(20, 98, 74, 0.16);
    --aurora-2: rgba(39, 94, 110, 0.12);
    --aurora-3: rgba(20, 98, 74, 0.08);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary), var(--secondary));
    --gradient-hero: linear-gradient(120deg, #14624A 0%, #275E6E 100%);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-tooltip: 400;
}

/* Dark mode — the green lightens so it keeps working on a dark ground.
   Every token defined in :root that carries colour is redefined here;
   components must reference tokens only, never a literal. */
[data-theme="dark"] {
    --primary: #4FBF95;
    --primary-light: #6FD3AE;
    --primary-dark: #2E9873;
    --secondary: #6FB3C7;
    --secondary-light: #8FC9D9;
    --accent: #4FBF95;
    --accent-light: #6FD3AE;
    --warning: #D9A441;
    --danger: #E3866F;

    --confidence-resolved: #4FBF95;
    --confidence-inherited: #D9A441;
    --confidence-ambiguous: #E3866F;

    --bg-primary: #0C110F;
    --bg-secondary: #121815;
    --bg-tertiary: #1A211D;
    --bg-card: #121815;
    --text-primary: #E9EFEB;
    --text-secondary: #9AA69F;
    --text-muted: #7C8880;
    --border-color: #263029;
    --shadow-color: rgba(0, 0, 0, 0.36);
    --shadow-color-strong: rgba(0, 0, 0, 0.55);

    --surface-sunken: #121815;
    --surface-raised: #1A211D;
    --rule-soft: rgba(233, 239, 235, 0.11);
    --accent-wash: rgba(79, 191, 149, 0.10);

    --aurora-1: rgba(79, 191, 149, 0.20);
    --aurora-2: rgba(111, 179, 199, 0.14);
    --aurora-3: rgba(79, 191, 149, 0.10);

    --gradient-hero: linear-gradient(120deg, #4FBF95 0%, #6FB3C7 100%);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    overflow-x: clip;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
    /* The page must never scroll horizontally. `clip` prevents it without the
       scroll-container side-effects `hidden` has on the sticky nav. Wide content
       (tables, code) scrolls inside its own overflow-x container instead. */
    overflow-x: clip;
}

img,
svg {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-light);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

code {
    font-family: var(--font-mono);
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition-base);
}

[data-theme="dark"] .nav {
    background: rgba(12, 17, 15, 0.82);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-menu a:not(.nav-github) {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.nav-menu a:not(.nav-github):hover {
    color: var(--text-primary);
}

.nav-github {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.85rem;
    transition: background var(--transition-fast);
}

.nav-github:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

/* Mobile navigation toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        height: calc(100vh - 64px);
        display: flex !important;
        background: #F7F8F5;
        /* Solid light mode background */
        flex-direction: column;
        padding: var(--space-xl);
        gap: var(--space-xl);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        z-index: 999;
        border-left: 1px solid var(--border-color);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1);
        overflow-y: auto;
    }

    [data-theme="dark"] .nav-menu {
        background: #0C110F;
        /* Solid dark mode background */
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
    }

    .nav-menu.open {
        transform: translateX(0);
    }

    .nav-toggle.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.open span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: calc(64px + var(--space-3xl)) 0 var(--space-3xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.aurora {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: aurora-float 20s ease-in-out infinite;
}

.aurora-1 {
    width: 600px;
    height: 600px;
    background: var(--aurora-1);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.aurora-2 {
    width: 500px;
    height: 500px;
    background: var(--aurora-2);
    top: 30%;
    right: -5%;
    animation-delay: -5s;
    animation-duration: 25s;
}

.aurora-3 {
    width: 400px;
    height: 400px;
    background: var(--aurora-3);
    bottom: 10%;
    left: 30%;
    animation-delay: -10s;
    animation-duration: 30s;
}

@keyframes aurora-float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    25% {
        transform: translate(5%, 5%) scale(1.05);
    }

    50% {
        transform: translate(-3%, 8%) scale(0.95);
    }

    75% {
        transform: translate(8%, -5%) scale(1.02);
    }
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s ease-out;
}

.badge-icon {
    font-size: 1rem;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.gradient-text {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.7;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-cta {
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.install-box {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
}

.install-box code {
    font-size: 1rem;
    color: var(--text-primary);
}

.install-box.large {
    padding: var(--space-lg) var(--space-xl);
}

.install-box.large code {
    font-size: 1.1rem;
}

.copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.copy-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.copy-btn .check-icon {
    display: none;
    color: var(--accent);
}

.copy-btn.copied svg:first-child {
    display: none;
}

.copy-btn.copied .check-icon {
    display: block;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px var(--shadow-color-strong);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-color-strong);
    color: white;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-xl);
    margin-top: var(--space-3xl);
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.hero-scroll a {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.hero-scroll a:hover {
    color: var(--primary);
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Section Styles
   ============================================ */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-3xl);
}

.section-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--accent-wash);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

[data-theme="dark"] .section-badge {
    background: var(--accent-wash);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: var(--space-4xl) 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--shadow-color);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--accent-wash);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    color: var(--icon-color, var(--primary));
}

[data-theme="dark"] .feature-icon {
    background: var(--accent-wash);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   Demo Section
   ============================================ */
.demo {
    padding: var(--space-4xl) 0;
}

.demo-container {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 20px 60px var(--shadow-color);
}

.demo-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.demo-dots {
    display: flex;
    gap: var(--space-sm);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background: #FF5F57;
}

.dot.yellow {
    background: #FFBD2E;
}

.dot.green {
    background: #28CA41;
}

.demo-title {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-family: var(--font-mono);
}

.demo-content {
    min-height: 500px;
    background: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.demo-content iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Mermaid Wrapper Styles */
.mermaid-wrapper {
    overflow: auto;
    max-height: 600px;
}

.mermaid-wrapper .mermaid {
    display: flex;
    justify-content: center;
    width: 100%;
}

.mermaid-wrapper svg {
    max-width: 100%;
    height: auto;
}

/* Demo Features */
.demo-features {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    margin-top: var(--space-xl);
    flex-wrap: wrap;
}

.demo-feature {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.demo-feature-icon {
    font-size: 1.25rem;
}

.demo-caption {
    text-align: center;
    margin-top: var(--space-lg);
    color: var(--text-secondary);
}

.demo-caption a {
    font-weight: 500;
}

/* Mobile-specific demo styles */
@media (max-width: 768px) {
    .demo-content {
        min-height: 400px;
        padding: var(--space-md);
    }

    .mermaid-wrapper {
        overflow-x: auto;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        max-height: 450px;
    }

    .mermaid-wrapper .mermaid {
        min-width: 600px;
    }

    .demo-features {
        gap: var(--space-md);
        padding: 0 var(--space-md);
    }

    .demo-feature {
        font-size: 0.8rem;
    }
}

/* ============================================
   Installation Section
   ============================================ */
.installation {
    padding: var(--space-4xl) 0;
    background: var(--bg-secondary);
}

/* Fixed 3-column grid for desktop, single column for tablet/mobile */
.install-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-3xl);
}

@media (max-width: 1200px) {
    .install-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }
}

.install-step {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    /* Let this grid cell shrink so long commands scroll inside the code block
       instead of pushing the whole card off-screen. */
    min-width: 0;
}

.install-step:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--shadow-color);
}

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

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-weight: 800;
    font-size: 1.25rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 14px var(--shadow-color-strong);
}

.step-content {
    flex: 1;
    min-width: 0;
}

.step-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.code-block {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    min-width: 0;
}

.code-block code {
    flex: 1;
    min-width: 0;
    font-size: 0.85rem;
    color: var(--text-primary);
    white-space: nowrap;
    line-height: 1.5;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.code-block .copy-btn {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
}

.cli-options {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
}

.cli-options h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.options-table {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

@media (max-width: 768px) {
    .options-table {
        grid-template-columns: 1fr;
    }
}

.option-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.option-row code {
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 600;
}

.option-row span {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ============================================
   Comparison Section
   ============================================ */
.comparison {
    padding: var(--space-4xl) 0;
}

.comparison-table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: var(--space-2xl);
}

/* Ensure table doesn't shrink on mobile */
@media (max-width: 768px) {
    .comparison-table-wrapper {
        margin-left: calc(-1 * var(--space-md));
        margin-right: calc(-1 * var(--space-md));
        padding: 0 var(--space-md);
    }

    .comparison-table {
        min-width: 600px;
    }
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.comparison-table th,
.comparison-table td {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    white-space: nowrap;
}

.comparison-table th:first-child {
    border-radius: var(--radius-md) 0 0 0;
}

.comparison-table th:last-child {
    border-radius: 0 var(--radius-md) 0 0;
}

.comparison-table td {
    background: var(--bg-card);
}

.comparison-table td.highlight {
    color: var(--primary);
    font-weight: 500;
}

.comparison-table tr:last-child td:first-child {
    border-radius: 0 0 0 var(--radius-md);
}

.comparison-table tr:last-child td:last-child {
    border-radius: 0 0 var(--radius-md) 0;
}

.comparison-callout {
    display: flex;
    gap: var(--space-lg);
    background: var(--accent-wash);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
}

[data-theme="dark"] .comparison-callout {
    background: var(--accent-wash);
}

.callout-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.callout-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.callout-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

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

.callout-content strong {
    color: var(--text-primary);
}

/* ============================================
   Use Cases Section
   ============================================ */
.use-cases {
    padding: var(--space-4xl) 0;
    background: var(--bg-secondary);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.use-case {
    text-align: center;
    padding: var(--space-xl);
}

.use-case-icon {
    font-size: 3rem;
    margin-bottom: var(--space-lg);
}

.use-case h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.use-case p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   CTA Section
   ============================================ */
.cta {
    padding: var(--space-4xl) 0;
    background: var(--gradient-primary);
    color: white;
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: var(--space-sm);
}

.cta p {
    font-size: 1.15rem;
    opacity: 0.9;
    margin-bottom: var(--space-xl);
}

.cta-install {
    margin-bottom: var(--space-xl);
}

.cta .install-box {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.cta .install-box code {
    color: white;
}

.cta .copy-btn {
    color: rgba(255, 255, 255, 0.8);
}

.cta .copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.cta-links {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.cta .btn-secondary {
    background: white;
    color: var(--primary);
    border: none;
}

.cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.9);
    color: var(--primary);
}

.cta .btn-outline {
    border-color: rgba(255, 255, 255, 0.5);
    color: white;
}

.cta .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-tertiary);
    padding: var(--space-3xl) 0 var(--space-xl);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--space-3xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.footer-col h4 {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-bottom a {
    color: var(--primary);
    font-weight: 500;
}

.copyright {
    margin-top: var(--space-sm);
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .footer-links {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Scroll Animations
   ============================================ */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered animations for grids */
.features-grid .feature-card:nth-child(1) {
    transition-delay: 0.1s;
}

.features-grid .feature-card:nth-child(2) {
    transition-delay: 0.2s;
}

.features-grid .feature-card:nth-child(3) {
    transition-delay: 0.3s;
}

.features-grid .feature-card:nth-child(4) {
    transition-delay: 0.4s;
}

.features-grid .feature-card:nth-child(5) {
    transition-delay: 0.5s;
}

.features-grid .feature-card:nth-child(6) {
    transition-delay: 0.6s;
}

.install-grid .install-step:nth-child(1) {
    transition-delay: 0.1s;
}

.install-grid .install-step:nth-child(2) {
    transition-delay: 0.2s;
}

.install-grid .install-step:nth-child(3) {
    transition-delay: 0.3s;
}

.use-cases-grid .use-case:nth-child(1) {
    transition-delay: 0.1s;
}

.use-cases-grid .use-case:nth-child(2) {
    transition-delay: 0.2s;
}

.use-cases-grid .use-case:nth-child(3) {
    transition-delay: 0.3s;
}

/* ============================================
   Utility Classes
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================
   Mobile Responsive Enhancements
   ============================================ */
@media (max-width: 768px) {

    /* Container padding */
    .container {
        padding: 0 var(--space-md);
    }

    /* Hero mobile fixes */
    .hero {
        padding: calc(64px + var(--space-xl)) 0 var(--space-xl);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .hero-stats {
        gap: var(--space-md);
        flex-wrap: wrap;
    }

    .stat-divider {
        display: none;
    }

    .install-box {
        flex-direction: row;
        justify-content: space-between;
        width: 100%;
        max-width: 320px;
    }

    .install-box code {
        font-size: 0.85rem;
    }

    /* Section header mobile */
    .section-header {
        margin-bottom: var(--space-xl);
    }

    .section-title {
        font-size: 1.75rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }

    /* Features mobile */
    .features {
        padding: var(--space-2xl) 0;
    }

    .feature-card {
        padding: var(--space-lg);
    }

    /* Installation mobile */
    .installation {
        padding: var(--space-2xl) 0;
    }

    .install-step {
        padding: var(--space-lg);
    }

    .step-number {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .code-block {
        padding: var(--space-sm);
    }

    .code-block code {
        font-size: 0.75rem;
        overflow-x: auto;
    }

    .cli-options {
        padding: var(--space-lg);
    }

    /* Use cases mobile */
    .use-cases {
        padding: var(--space-2xl) 0;
    }

    .use-case {
        padding: var(--space-lg);
    }

    /* CTA mobile */
    .cta {
        padding: var(--space-2xl) 0;
    }

    .cta h2 {
        font-size: 1.5rem;
    }

    /* Footer mobile */
    .footer-grid {
        gap: var(--space-xl);
    }

    .footer-links {
        margin-top: var(--space-lg);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }

    /* Callout mobile */
    .comparison-callout {
        flex-direction: column;
        padding: var(--space-lg);
    }

    .callout-icon {
        font-size: 1.5rem;
    }
}

/* Extra small screens */
@media (max-width: 375px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .install-box code {
        font-size: 0.75rem;
    }

    .btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.875rem;
    }
}
/* ============================================
   Brand mark
   The nav/footer logo is inline SVG using currentColor so it inverts
   with the theme. The 5.5 MB PNG is no longer loaded on any page.
   ============================================ */
.brand-mark {
    width: 26px;
    height: 29px;
    flex: 0 0 auto;
    color: var(--primary);
    display: block;
}

.nav-logo {
    text-decoration: none;
}

.nav-logo .brand-word {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    white-space: nowrap;
}

@media (max-width: 420px) {
    .nav-logo .brand-word {
        font-size: 0.82rem;
    }
}

/* ============================================
   Shared utilities
   These exist so pages stop reaching for inline rgba() literals that
   only work in one theme. Anything a content page needs should be a
   token or a class here.
   ============================================ */

/* Wide content must scroll inside itself — the page body never does. */
.scroll-x {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: var(--space-md) 0;
}

.data-table {
    width: 100%;
    min-width: 520px;
    border-collapse: collapse;
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;
}

.data-table th {
    text-align: right;
    padding: 0.5rem 0.6rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.data-table td {
    text-align: right;
    padding: 0.55rem 0.6rem;
    border-bottom: 1px solid var(--rule-soft);
    color: var(--text-secondary);
}

.data-table th:first-child,
.data-table td:first-child {
    text-align: left;
    color: var(--text-primary);
}

.data-table tbody tr:last-child td {
    border-bottom: 0;
}

/* The row that represents pyvisualizer's own result. */
.data-table tr.is-ours td {
    font-weight: 600;
    color: var(--primary);
    background: var(--accent-wash);
}

.data-table tr.is-ours td:first-child {
    color: var(--text-primary);
}

/* Confidence chips — the product's own taxonomy, used as a legend. */
.conf {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 0.15em 0.5em;
    border-radius: var(--radius-sm);
    border: 1px solid currentColor;
    white-space: nowrap;
}

.conf-resolved {
    color: var(--confidence-resolved);
}

.conf-inherited {
    color: var(--confidence-inherited);
}

.conf-ambiguous {
    color: var(--confidence-ambiguous);
}

.footnote {
    font-size: 0.78rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin: var(--space-md) 0 0;
}

/* Site footer — one pattern across every page. */
.site-footer {
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
    padding: var(--space-2xl) 0;
    margin-top: var(--space-4xl);
}

.site-footer .footer-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xl);
    align-items: flex-start;
    justify-content: space-between;
}

.site-footer .footer-id {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.site-footer .footer-id .brand-word {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-primary);
}

.site-footer nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.site-footer nav a {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.site-footer nav a:hover {
    color: var(--primary);
}

.site-footer .footer-legal {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--rule-soft);
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-md);
    justify-content: space-between;
}

.site-footer .footer-legal a {
    color: var(--text-secondary);
}