/* ==========================================================================
   CodeVoyager Landing Page Styles
   Aesthetic: Refined Terminal Elegance
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables & Theme
   -------------------------------------------------------------------------- */
:root {
    /* Colors - Dark Theme (Default) */
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #18181b;
    --bg-elevated: #1f1f23;

    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;

    /* Syntax-inspired accents */
    --accent-cyan: #67e8f9;
    --accent-amber: #fcd34d;
    --accent-purple: #c4b5fd;
    --accent-green: #86efac;
    --accent-pink: #f9a8d4;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    --gradient-subtle: linear-gradient(180deg, rgba(103, 232, 249, 0.1), rgba(196, 181, 253, 0.05));

    /* Borders */
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.1);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 60px rgba(103, 232, 249, 0.15);

    /* Typography */
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, 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: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

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

/* Light Theme */
@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #fafafa;
        --bg-secondary: #f4f4f5;
        --bg-tertiary: #e4e4e7;
        --bg-elevated: #ffffff;

        --text-primary: #09090b;
        --text-secondary: #52525b;
        --text-tertiary: #a1a1aa;

        --accent-cyan: #0891b2;
        --accent-amber: #d97706;
        --accent-purple: #7c3aed;
        --accent-green: #059669;
        --accent-pink: #db2777;

        --gradient-primary: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
        --gradient-subtle: linear-gradient(180deg, rgba(8, 145, 178, 0.08), rgba(124, 58, 237, 0.04));

        --border-subtle: rgba(0, 0, 0, 0.04);
        --border-medium: rgba(0, 0, 0, 0.08);

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
        --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
        --shadow-glow: 0 0 60px rgba(8, 145, 178, 0.1);
    }
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

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

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-md) var(--space-xl);
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
}

@media (prefers-color-scheme: light) {
    .nav {
        background: rgba(250, 250, 250, 0.8);
    }
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 1.125rem;
}

.logo-icon {
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

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

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-github {
    display: flex;
    align-items: center;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    transition: background var(--transition-fast);
}

.nav-github:hover {
    background: var(--bg-elevated);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: calc(80px + var(--space-4xl)) var(--space-xl) var(--space-3xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(103, 232, 249, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 30% 20%, rgba(196, 181, 253, 0.06) 0%, transparent 40%);
    pointer-events: none;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--border-subtle) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: linear-gradient(to bottom, black, transparent 80%);
    -webkit-mask-image: linear-gradient(to bottom, black, transparent 80%);
}

.hero-content {
    max-width: 800px;
    text-align: center;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
    background: rgba(103, 232, 249, 0.1);
    border: 1px solid rgba(103, 232, 249, 0.2);
    border-radius: 100px;
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s ease backwards;
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--accent-cyan);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

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

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.6s ease 0.1s backwards;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
    animation: fadeInUp 0.6s ease 0.2s backwards;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-bottom: var(--space-2xl);
    animation: fadeInUp 0.6s ease 0.3s backwards;
}

.hero-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--text-tertiary);
    animation: fadeInUp 0.6s ease 0.4s backwards;
}

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

.meta-icon {
    color: var(--accent-green);
    font-size: 0.625rem;
}

.meta-divider {
    color: var(--border-medium);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--gradient-primary);
    color: #000;
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 80px rgba(103, 232, 249, 0.25);
}

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

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

.btn-icon {
    font-size: 1.125rem;
}

.btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.2;
}

.btn-label {
    font-weight: 600;
}

.btn-version {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    opacity: 0.8;
}

.btn-arrow {
    transition: transform var(--transition-fast);
}

.btn-secondary:hover .btn-arrow {
    transform: translateX(4px);
}

.btn-large {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1rem;
}

/* --------------------------------------------------------------------------
   Hero Visual - Editor Window
   -------------------------------------------------------------------------- */
.hero-visual {
    width: 100%;
    max-width: 900px;
    margin-top: var(--space-3xl);
    animation: fadeInUp 0.8s ease 0.5s backwards;
}

.editor-window {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-medium);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.editor-titlebar {
    display: flex;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-subtle);
}

.titlebar-buttons {
    display: flex;
    gap: 8px;
}

.titlebar-buttons span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.btn-close { background: #ff5f57; }
.btn-minimize { background: #ffbd2e; }
.btn-maximize { background: #28ca41; }

.titlebar-title {
    flex: 1;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

.editor-content {
    display: flex;
    min-height: 300px;
}

.editor-sidebar {
    width: 200px;
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-right: 1px solid var(--border-subtle);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.sidebar-item.nested {
    padding-left: var(--space-xl);
}

.sidebar-item.active-file {
    background: rgba(103, 232, 249, 0.1);
    color: var(--accent-cyan);
}

.folder-icon {
    font-size: 0.625rem;
    color: var(--text-tertiary);
}

.file-icon {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    background: var(--accent-amber);
}

.file-icon.swift {
    background: linear-gradient(135deg, #f05138, #fa7343);
}

.editor-code {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.7;
    overflow: hidden;
}

.code-line {
    display: flex;
    white-space: pre;
}

.line-num {
    width: 30px;
    color: var(--text-tertiary);
    user-select: none;
    text-align: right;
    padding-right: var(--space-md);
}

.keyword { color: var(--accent-pink); }
.type { color: var(--accent-cyan); }
.variable { color: var(--text-primary); }
.literal { color: var(--accent-purple); }

.code-cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background: var(--accent-cyan);
    animation: blink 1s step-end infinite;
    margin-left: 2px;
    vertical-align: text-bottom;
}

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

/* --------------------------------------------------------------------------
   Section Common Styles
   -------------------------------------------------------------------------- */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-4xl) var(--space-xl);
}

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

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-cyan);
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Features Section
   -------------------------------------------------------------------------- */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.feature-card {
    position: relative;
    padding: var(--space-xl);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-highlight {
    grid-column: span 2;
    background: var(--gradient-subtle);
    border-color: rgba(103, 232, 249, 0.2);
}

.feature-highlight:hover {
    border-color: rgba(103, 232, 249, 0.3);
}

@media (max-width: 768px) {
    .feature-highlight {
        grid-column: span 1;
    }
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    color: var(--accent-cyan);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.feature-badge {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
    background: rgba(103, 232, 249, 0.1);
    padding: var(--space-xs) var(--space-sm);
    border-radius: 100px;
}

/* --------------------------------------------------------------------------
   Performance Section
   -------------------------------------------------------------------------- */
.performance {
    background: var(--bg-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-3xl);
}

@media (max-width: 900px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 500px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

.stat-card {
    text-align: center;
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
}

.stat-value {
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.stat-prefix {
    font-size: 2rem;
    opacity: 0.7;
}

.stat-unit {
    font-size: 1.5rem;
    opacity: 0.7;
}

.stat-label {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.stat-desc {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

/* Comparison */
.comparison {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.comparison-header {
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-subtle);
}

.comparison-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.comparison-content {
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

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

.comparison-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.comparison-icon {
    font-size: 0.75rem;
}

.comparison-item.native .comparison-icon {
    color: var(--accent-cyan);
}

.comparison-item.electron .comparison-icon {
    color: var(--text-tertiary);
}

.comparison-bar {
    position: relative;
    height: 32px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    width: var(--width);
    border-radius: var(--radius-sm);
    transition: width 1s ease;
}

.comparison-item.native .bar-fill {
    background: var(--gradient-primary);
}

.comparison-item.electron .bar-fill {
    background: var(--text-tertiary);
    opacity: 0.5;
}

.bar-value {
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.8125rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Install Section
   -------------------------------------------------------------------------- */
.install {
    background: var(--bg-secondary);
}

.install-steps {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}

.install-step {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    max-width: 250px;
}

.step-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 1.125rem;
    background: var(--gradient-primary);
    color: #000;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.step-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Install Note */
.install-note {
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
    padding: var(--space-xl);
    background: rgba(103, 232, 249, 0.05);
    border: 1px solid rgba(103, 232, 249, 0.1);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.note-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(103, 232, 249, 0.1);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.note-icon svg {
    width: 24px;
    height: 24px;
    color: var(--accent-cyan);
}

.note-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.note-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Install CTA */
.install-cta {
    text-align: center;
}

.cta-meta {
    margin-top: var(--space-md);
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-2xl) var(--space-xl);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: var(--space-xl);
}

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

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

.footer-copy {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    .nav-links a:not(.nav-github) {
        display: none;
    }

    .hero {
        padding-top: calc(60px + var(--space-3xl));
    }

    .hero-subtitle {
        font-size: 1.0625rem;
    }

    .editor-sidebar {
        display: none;
    }

    .section-container {
        padding: var(--space-3xl) var(--space-md);
    }

    .install-note {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }

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

/* --------------------------------------------------------------------------
   Scroll Animations
   -------------------------------------------------------------------------- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.stagger-children > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.05s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.15s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.25s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.3s; }

.stagger-children.visible > * {
    opacity: 1;
    transform: translateY(0);
}