/* ===================================================================
   PicoClaw.ai — Main Stylesheet
   Ultra-Lightweight AI Assistant Website
   =================================================================== */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
    /* Brand Colors */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-primary-bg: rgba(99, 102, 241, 0.08);
    --color-accent: #06b6d4;
    --color-accent-light: #22d3ee;

    /* Status Colors */
    --color-green: #10b981;
    --color-green-bg: rgba(16, 185, 129, 0.1);
    --color-yellow: #f59e0b;
    --color-yellow-bg: rgba(245, 158, 11, 0.1);
    --color-red: #ef4444;
    --color-red-bg: rgba(239, 68, 68, 0.1);

    /* Neutrals */
    --color-bg: #0b0d17;
    --color-bg-alt: #111425;
    --color-bg-card: #161933;
    --color-bg-card-hover: #1c2044;
    --color-surface: #1e2139;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-border-light: rgba(255, 255, 255, 0.1);

    /* Text */
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-heading: #f8fafc;
    --color-text-code: #c4b5fd;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1, #06b6d4);
    --gradient-hero: linear-gradient(180deg, #0b0d17 0%, #111425 50%, #0b0d17 100%);
    --gradient-card: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(6, 182, 212, 0.05));
    --gradient-glow: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15), transparent 70%);

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

    /* Borders */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.2);

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

    /* Layout */
    --max-width: 1200px;
    --navbar-height: 72px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--navbar-height);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--color-text-code);
    background: rgba(99, 102, 241, 0.1);
    padding: 0.15em 0.4em;
    border-radius: var(--radius-sm);
}

strong {
    color: var(--color-text-heading);
    font-weight: 600;
}

/* --- Accessibility --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: #fff;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-sm);
    z-index: 10000;
    font-weight: 600;
}

.skip-link:focus {
    top: var(--space-sm);
}

.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;
}

/* --- Container --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }
}

/* --- Gradient Text --- */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===================================================================
   NAVBAR
   =================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(11, 13, 23, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(11, 13, 23, 0.95);
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text-heading);
    text-decoration: none;
}

.nav-brand:hover {
    color: var(--color-text-heading);
}

.nav-logo {
    border-radius: var(--radius-sm);
}

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

.nav-link {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-text-heading);
    background: rgba(255, 255, 255, 0.05);
}

.nav-github {
    background: var(--color-primary-bg);
    color: var(--color-primary-light);
    margin-left: var(--space-sm);
}

.nav-github:hover {
    background: var(--color-primary);
    color: #fff;
}

/* Nav Toggle (Mobile) */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: all var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

@media (max-width: 1024px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        flex-direction: column;
        align-items: flex-start;
        background: var(--color-bg-alt);
        padding: calc(var(--navbar-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
        gap: var(--space-xs);
        transition: right var(--transition-slow);
        border-left: 1px solid var(--color-border);
        overflow-y: auto;
    }

    .nav-links.open {
        right: 0;
    }

    .nav-link {
        width: 100%;
        padding: var(--space-md);
        font-size: 1rem;
    }

    .nav-github {
        margin-left: 0;
        margin-top: var(--space-md);
    }
}

/* ===================================================================
   BUTTONS
   =================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.625rem 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
    color: #fff;
}

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

.btn-secondary:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-primary-light);
    color: var(--color-text-heading);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary-light);
    border: 1px solid var(--color-primary);
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1.0625rem;
}

/* ===================================================================
   SECTION COMMON
   =================================================================== */
.section {
    padding: var(--space-4xl) 0;
    position: relative;
}

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

.section-badge {
    display: inline-block;
    background: var(--color-primary-bg);
    color: var(--color-primary-light);
    font-size: 0.8125rem;
    font-weight: 600;
    padding: 0.35em 1em;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--color-text-heading);
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.section-description {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ===================================================================
   HERO
   =================================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--navbar-height) + var(--space-3xl)) 0 var(--space-3xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: var(--gradient-glow);
    pointer-events: none;
}

.hero-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-primary-bg);
    color: var(--color-primary-light);
    font-size: 0.8125rem;
    font-weight: 600;
    padding: 0.4em 1.2em;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-xl);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    color: var(--color-text-heading);
}

.hero-emoji {
    display: inline-block;
    font-size: 0.8em;
}

.hero-subtitle-text {
    font-size: 0.45em;
    font-weight: 400;
    color: var(--color-text-muted);
    display: block;
    margin-top: var(--space-sm);
}

.hero-tagline {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-accent-light);
    margin-bottom: var(--space-lg);
    font-family: var(--font-mono);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.8;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-text-heading);
    font-family: var(--font-mono);
}

.stat-label {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

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

/* Hero Actions */
.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}

/* Hero Code Block */
.hero-code {
    max-width: 500px;
    margin: 0 auto;
    text-align: left;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
    box-shadow: var(--shadow-lg);
}

.code-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--color-border);
}

.code-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.code-dot.red { background: #ef4444; }
.code-dot.yellow { background: #f59e0b; }
.code-dot.green { background: #10b981; }

.code-title {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    margin-left: auto;
}

.hero-code pre {
    padding: var(--space-lg);
    overflow-x: auto;
    font-size: 0.875rem;
    line-height: 1.8;
}

.hero-code code {
    background: none;
    padding: 0;
    color: var(--color-text);
    font-size: 0.875rem;
}

.code-prompt {
    color: var(--color-green);
    font-weight: 700;
}

.code-comment {
    color: #64748b;
}

.code-string {
    color: var(--color-accent-light);
}

/* Hero Scroll Indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-text-muted);
    font-size: 1.25rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ===================================================================
   FEATURES
   =================================================================== */
.features-section {
    background: var(--color-bg-alt);
}

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

.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-glow);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    color: #fff;
    margin-bottom: var(--space-lg);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--space-sm);
}

.feature-desc {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.feature-metric {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 800;
    font-family: var(--font-mono);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================================================
   COMPARISON
   =================================================================== */
.comparison-table-wrapper {
    overflow-x: auto;
    margin-bottom: var(--space-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.comparison-table thead {
    background: var(--color-surface);
}

.comparison-table th {
    padding: var(--space-lg) var(--space-xl);
    text-align: left;
    font-weight: 700;
    color: var(--color-text-heading);
    border-bottom: 2px solid var(--color-border);
    white-space: nowrap;
}

.comparison-table td {
    padding: var(--space-md) var(--space-xl);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

.comparison-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.03);
}

.highlight-col {
    background: rgba(99, 102, 241, 0.06) !important;
    color: var(--color-text-heading) !important;
}

.text-green { color: var(--color-green) !important; }
.text-yellow { color: var(--color-yellow) !important; }
.text-red { color: var(--color-red) !important; }

.comparison-visual {
    text-align: center;
}

.comparison-visual img {
    margin: 0 auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 600px;
}

/* ===================================================================
   DEMO
   =================================================================== */
.demo-section {
    background: var(--color-bg-alt);
}

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

.demo-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.demo-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(99, 102, 241, 0.3);
}

.demo-visual {
    overflow: hidden;
    background: #000;
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.demo-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.demo-info {
    padding: var(--space-lg);
}

.demo-info h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.demo-info h3 i {
    color: var(--color-primary-light);
}

.demo-info p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.demo-tags {
    display: flex;
    gap: var(--space-sm);
    list-style: none;
}

.demo-tags li {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary-light);
    background: var(--color-primary-bg);
    padding: 0.25em 0.75em;
    border-radius: var(--radius-full);
}

/* Demo Showcase */
.demo-memory-showcase {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-2xl);
    align-items: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
}

.showcase-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--space-md);
}

.showcase-content p {
    color: var(--color-text-muted);
    line-height: 1.7;
}

.showcase-images {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.showcase-images figure {
    text-align: center;
}

.showcase-images img {
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    width: 100%;
    height: auto;
}

.showcase-images figcaption {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
}

@media (max-width: 1024px) {
    .demo-grid {
        grid-template-columns: 1fr;
    }

    .demo-memory-showcase {
        grid-template-columns: 1fr;
    }
}

/* ===================================================================
   HARDWARE
   =================================================================== */
.hardware-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.hardware-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    position: relative;
    transition: all var(--transition-normal);
}

.hardware-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(99, 102, 241, 0.3);
}

.hardware-card.featured {
    border-color: var(--color-primary);
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.15);
}

.hardware-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.3em 1em;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hardware-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    font-size: 1.5rem;
    color: var(--color-primary-light);
    margin: 0 auto var(--space-lg);
}

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

.hardware-price {
    font-size: 2rem;
    font-weight: 800;
    font-family: var(--font-mono);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-md);
}

.hardware-desc {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.hardware-specs {
    list-style: none;
    text-align: left;
    margin-bottom: var(--space-lg);
}

.hardware-specs li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    padding: var(--space-sm) 0;
}

.hardware-specs li i {
    color: var(--color-green);
    font-size: 0.75rem;
}

@media (max-width: 1024px) {
    .hardware-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
}

/* ===================================================================
   INSTALL
   =================================================================== */
.install-section {
    background: var(--color-bg-alt);
}

.install-tabs {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.install-tab {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.625rem 1.25rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.install-tab:hover {
    color: var(--color-text-heading);
    border-color: var(--color-primary);
}

.install-tab.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.install-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.install-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.install-panel h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--space-sm);
}

.install-panel > p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

/* Code Block */
.code-block {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
    margin-bottom: var(--space-lg);
}

.code-block .code-header {
    position: relative;
}

.copy-btn {
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: 1px solid var(--color-border-light);
    color: var(--color-text-muted);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.75rem;
    transition: all var(--transition-fast);
}

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

.copy-btn.copied {
    color: var(--color-green);
    border-color: var(--color-green);
}

.code-block pre {
    padding: var(--space-lg);
    overflow-x: auto;
    font-size: 0.8125rem;
    line-height: 1.9;
}

.code-block code {
    background: none;
    padding: 0;
    color: var(--color-text);
    font-size: 0.8125rem;
}

/* Quick Start Config */
.quickstart-config {
    margin-top: var(--space-3xl);
    padding: var(--space-2xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
}

.quickstart-config > h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.quickstart-config > h3 i {
    color: var(--color-primary-light);
}

.quickstart-config > p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

.api-providers {
    margin-top: var(--space-xl);
}

.api-providers h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: var(--space-md);
}

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

.provider-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.4em 1em;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.provider-badge:hover {
    color: var(--color-primary-light);
    border-color: var(--color-primary);
    background: var(--color-primary-bg);
}

/* ===================================================================
   CHAT APPS
   =================================================================== */
.chatapps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}

.chatapp-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    transition: all var(--transition-normal);
}

.chatapp-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(99, 102, 241, 0.3);
}

.chatapp-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    font-size: 1.75rem;
    margin: 0 auto var(--space-lg);
}

.chatapp-icon.telegram { background: rgba(38, 165, 229, 0.15); color: #26A5E5; }
.chatapp-icon.discord { background: rgba(88, 101, 242, 0.15); color: #5865F2; }
.chatapp-icon.qq { background: rgba(18, 183, 245, 0.15); color: #12B7F5; }
.chatapp-icon.dingtalk { background: rgba(0, 123, 255, 0.15); color: #007BFF; }

.chatapp-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--space-sm);
}

.chatapp-difficulty {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2em 0.8em;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.chatapp-difficulty.easy {
    background: var(--color-green-bg);
    color: var(--color-green);
}

.chatapp-difficulty.medium {
    background: var(--color-yellow-bg);
    color: var(--color-yellow);
}

.chatapp-card p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    text-align: left;
}

@media (max-width: 1024px) {
    .chatapps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .chatapps-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================================================
   CLI REFERENCE
   =================================================================== */
.cli-section {
    background: var(--color-bg-alt);
}

.cli-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    max-width: 800px;
    margin: 0 auto;
}

.cli-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    transition: all var(--transition-fast);
}

.cli-item:hover {
    border-color: rgba(99, 102, 241, 0.3);
}

.cli-command {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-accent-light);
    background: rgba(6, 182, 212, 0.1);
    padding: 0.25em 0.6em;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    flex-shrink: 0;
}

.cli-desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

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

    .cli-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
}

/* ===================================================================
   FAQ
   =================================================================== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.faq-item:hover {
    border-color: rgba(99, 102, 241, 0.3);
}

.faq-item[open] {
    border-color: var(--color-primary);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    cursor: pointer;
    list-style: none;
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-heading);
}

.faq-icon {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    transition: transform var(--transition-fast);
    flex-shrink: 0;
    margin-left: var(--space-md);
}

.faq-item[open] .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 var(--space-xl) var(--space-lg);
}

.faq-answer p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.faq-answer a {
    color: var(--color-primary-light);
}

/* ===================================================================
   CTA
   =================================================================== */
.cta-section {
    background: var(--color-bg-alt);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--space-3xl) 0;
}

.cta-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--color-text-heading);
    margin-bottom: var(--space-md);
    line-height: 1.2;
}

.cta-description {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-2xl);
    line-height: 1.7;
}

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

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

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

.footer-brand img {
    border-radius: var(--radius-sm);
}

.footer-brand h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-heading);
}

.footer-brand p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.footer-links h4 {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-text-heading);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.footer-social a {
    color: var(--color-text-muted);
    font-size: 1.25rem;
    transition: color var(--transition-fast);
}

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

@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 640px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ===================================================================
   ANIMATIONS
   =================================================================== */
[data-aos] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* Particle */
.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(99, 102, 241, 0.3);
    border-radius: 50%;
    animation: floatParticle linear infinite;
}

@keyframes floatParticle {
    0% {
        transform: translateY(100vh) scale(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-10vh) scale(1);
        opacity: 0;
    }
}

/* ===================================================================
   RESPONSIVE UTILITIES
   =================================================================== */
@media (max-width: 768px) {
    .section {
        padding: var(--space-3xl) 0;
    }

    .hero {
        padding-top: calc(var(--navbar-height) + var(--space-2xl));
        min-height: auto;
    }

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

    .stat-divider {
        display: none;
    }

    .stat-item {
        min-width: 80px;
    }

    .hero-code {
        max-width: 100%;
    }
}

/* Print styles */
@media print {
    .navbar,
    .hero-particles,
    .hero-scroll-indicator,
    .nav-toggle,
    .cta-section {
        display: none !important;
    }

    body {
        color: #000;
        background: #fff;
    }

    a {
        color: #000;
    }

    .gradient-text {
        -webkit-text-fill-color: #4f46e5;
    }
}