/* =========================================
   CSS Variables & Design Tokens
   ========================================= */
   :root {
    --bg-base: #0a0a0c;
    --bg-surface: rgba(20, 20, 24, 0.6);
    --bg-glass: rgba(30, 30, 35, 0.4);
    --bg-glass-hover: rgba(45, 45, 50, 0.6);
    
    --text-primary: #f2f2f5;
    --text-secondary: #a0a0a8;
    --text-muted: #6e6e75;
    
    --accent-primary: #5e6ad2;
    --accent-primary-hover: #4b55b2;
    --accent-glow: rgba(94, 106, 210, 0.3);
    
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.15);
    
    --blur-sm: blur(8px);
    --blur-md: blur(16px);
    --blur-lg: blur(24px);

    --transition-fast: 0.2s cubic-bezier(0.25, 1, 0.5, 1);
    --transition-base: 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    --transition-slow: 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

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

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* =========================================
   Background Effects
   ========================================= */
.noise-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

.gradient-bg {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    z-index: -1;
    background: radial-gradient(circle at 15% 50%, rgba(94, 106, 210, 0.08) 0%, transparent 40%),
                radial-gradient(circle at 85% 30%, rgba(138, 94, 210, 0.08) 0%, transparent 40%);
    pointer-events: none;
}

/* =========================================
   Common Components
   ========================================= */
.glass-pane {
    background: var(--bg-glass);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-base);
}

.text-gradient {
    background: linear-gradient(135deg, #a5b4fc 0%, #818cf8 50%, #c084fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.primary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--accent-primary);
    color: white;
    padding: 12px 24px;
    border-radius: 99px;
    font-weight: 500;
    font-size: 0.95rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 12px var(--accent-glow);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.primary-btn:hover {
    background: var(--accent-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--accent-glow);
}

.secondary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--bg-surface);
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 99px;
    font-weight: 500;
    font-size: 0.95rem;
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-fast);
    cursor: pointer;
}

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

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

/* =========================================
   Layout & Sections
   ========================================= */
.section {
    padding: 120px 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* =========================================
   Navigation
   ========================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 20px 5%;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    padding: 12px 5%;
    background: rgba(10, 10, 12, 0.8);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border-bottom: 1px solid var(--border-subtle);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.logo i {
    font-size: 1.5rem;
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a:not(.nav-btn) {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

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

/* =========================================
   Hero Section
   ========================================= */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    padding-top: 160px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.5;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

/* =========================================
   Interface Screenshot (Hero Visual)
   ========================================= */
.hero-visual {
    flex: 1;
    perspective: 1000px;
}

.screenshot-container {
    padding: 8px;
    background: rgba(40, 40, 45, 0.4);
    border-radius: 12px;
    box-shadow: -20px 20px 60px rgba(0, 0, 0, 0.4), 0 0 40px rgba(94, 106, 210, 0.1);
    transform: rotateY(-8deg) rotateX(4deg);
    transition: transform var(--transition-base);
}

.screenshot-container:hover {
    transform: rotateY(-2deg) rotateX(1deg) scale(1.02);
}

.hero-screenshot {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
    border: 1px solid var(--border-subtle);
}

/* =========================================
   Features Section
   ========================================= */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 32px;
}

.feature-card:hover {
    background: var(--bg-glass-hover);
    border-color: var(--border-light);
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2rem;
    color: var(--accent-primary);
    margin-bottom: 20px;
    height: 48px;
    width: 48px;
    border-radius: 12px;
    background: rgba(94, 106, 210, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

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

/* =========================================
   Usage Section
   ========================================= */
.usage-container {
    padding: 64px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.usage-content {
    max-width: 800px;
    width: 100%;
    text-align: center;
}

.code-window {
    text-align: left;
    margin-top: 40px;
    background: #111116;
    border-radius: 12px;
    border: 1px solid var(--border-subtle);
    overflow: hidden;
}

.code-content {
    padding: 24px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.9rem;
}

.code-content .comment {
    color: #6a737d;
    margin-bottom: 4px;
}

.code-content .command {
    color: #e1e4e8;
}

.code-content .prompt {
    color: var(--accent-primary);
    margin-right: 8px;
}

.requirements-box {
    text-align: left;
    margin-top: 32px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 24px;
}

.requirements-title {
    font-size: 1.05rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.requirements-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

.requirements-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.requirements-list i {
    color: var(--accent-primary);
    font-size: 1.1rem;
}

.text-link {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px dashed var(--border-light);
    transition: all var(--transition-fast);
}

.text-link:hover {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.install-guide {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px dashed var(--border-light);
}

.install-guide summary {
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.install-guide summary:hover {
    color: var(--accent-primary);
}

.guide-content {
    margin-top: 16px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.guide-content ol {
    margin: 12px 0 12px 24px;
}

.guide-content li {
    margin-bottom: 8px;
}

.guide-content code {
    background: #111116;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.85rem;
    color: #e1e4e8;
}

.text-sm {
    font-size: 0.8rem;
}

.mt-2 {
    margin-top: 16px;
}

/* =========================================
   Credits Section
   ========================================= */
.credits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 48px;
}

.credit-card {
    display: block;
    position: relative;
    padding: 24px;
}

.credit-card:hover {
    background: var(--bg-glass-hover);
    border-color: var(--border-light);
    transform: translateY(-3px);
}

.credit-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.credit-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-right: 20px;
}

.credit-card i {
    position: absolute;
    top: 24px;
    right: 24px;
    color: var(--text-muted);
    font-size: 1.2rem;
    transition: color var(--transition-fast);
}

.credit-card:hover i {
    color: var(--accent-primary);
}

.note-author {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: 32px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 16px;
    border: 1px dashed var(--border-subtle);
}

.comment-text {
    font-style: italic;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* =========================================
   Footer
   ========================================= */
.footer {
    padding: 40px 5%;
    border-top: 1px solid var(--border-subtle);
    background: rgba(10, 10, 12, 0.5);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-weight: 500;
}

.copyright {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* =========================================
   Animations & Transitions
   ========================================= */
.fade-up-element {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }

/* =========================================
   Responsive Design
   ========================================= */
@media (max-width: 900px) {
    .hero-section {
        flex-direction: column;
        text-align: center;
        padding-top: 120px;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-actions {
        justify-content: center;
    }

    .screenshot-container {
        transform: rotateY(0) rotateX(0);
    }
    .screenshot-container:hover {
        transform: scale(1.02);
    }
}

@media (max-width: 768px) {
    .nav-links a:not(.nav-btn) {
        display: none;
    }
    
    .section {
        padding: 80px 5%;
    }
    
    .usage-container {
        padding: 32px 16px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
}