:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-success: #3fb950;
    --text-warning: #d29922;
    --text-error: #f85149;
    --text-info: #58a6ff;
    --border-color: #30363d;
    --accent-primary: #58a6ff;
    --accent-secondary: #bc8cff;
    --accent-success: #238636;
    --gradient-primary: linear-gradient(135deg, #58a6ff, #bc8cff);
    --gradient-success: linear-gradient(135deg, #238636, #2ea043);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --border-radius-sm: 6px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    scroll-behavior: smooth;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
.header {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

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

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-primary);
    border-bottom: 2px solid var(--accent-primary);
}

/* Hero Section */
.hero {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 3rem;
    padding: 3rem 0 4rem;
    flex-wrap: wrap;
}

.hero-content {
    flex: 1;
    min-width: 280px;
}

.hero-badge {
    display: inline-block;
    background: rgba(88, 166, 255, 0.2);
    color: var(--accent-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    border: 1px solid rgba(88, 166, 255, 0.3);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-primary);
}

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

.hero-visual {
    flex: 1;
    min-width: 300px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

/* Terminal */
.terminal {
    background: var(--bg-primary);
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

.terminal-header {
    background: var(--bg-tertiary);
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.terminal-dot:nth-child(1) { background: #ff5f56; }
.terminal-dot:nth-child(2) { background: #ffbd2e; }
.terminal-dot:nth-child(3) { background: #27c93f; }

.terminal-body {
    padding: 1rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
}

.terminal-line {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.terminal-line .prompt {
    color: var(--accent-primary);
}

.terminal-line .success {
    color: var(--text-success);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(46, 160, 67, 0.3);
}

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

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

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

.btn-outline:hover {
    background: rgba(88, 166, 255, 0.1);
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.card h3, .card h4 {
    margin: 0 0 0.5rem;
}

/* Image Placeholders */
.image-placeholder {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    margin: 1.5rem 0;
    transition: border-color var(--transition-fast);
}

.image-placeholder:hover {
    border-color: var(--accent-primary);
}

.image-placeholder::before {
    content: '🖼️';
    font-size: 2rem;
    display: block;
    margin-bottom: 0.5rem;
    opacity: 0.7;
}

.image-placeholder .placeholder-text {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.image-placeholder .placeholder-caption {
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-family: monospace;
}

.image-row {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin: 1.5rem 0;
}

.image-row .image-placeholder {
    flex: 1;
    min-width: 250px;
    margin: 0;
}

/* Video Placeholders */
.video-placeholder {
    background: linear-gradient(135deg, #0a0c10, var(--bg-secondary));
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    margin: 1.5rem 0;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.video-placeholder:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.video-placeholder .play-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    display: inline-block;
    background: var(--accent-primary);
    width: 70px;
    height: 70px;
    border-radius: 50%;
    line-height: 70px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.video-placeholder .duration {
    display: inline-block;
    background: var(--bg-tertiary);
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.7rem;
    margin-top: 0.5rem;
    color: var(--accent-primary);
}

/* Demo Grid */
.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.demo-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
    cursor: pointer;
}

.demo-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
}

.demo-card .video-thumb {
    height: 160px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.demo-card .video-thumb .play-btn {
    width: 50px;
    height: 50px;
    background: rgba(0,0,0,0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all var(--transition-fast);
}

.demo-card .video-thumb:hover .play-btn {
    background: var(--accent-primary);
    transform: scale(1.1);
}

.demo-card .demo-info {
    padding: 1rem;
}

.demo-card .demo-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.demo-card .demo-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Code Blocks */
.code-block {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    margin: 1rem 0;
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

.code-block pre {
    padding: 1rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-primary);
    overflow-x: auto;
    margin: 0;
}

.code-block .comment { color: var(--text-secondary); }
.code-block .keyword { color: #ff7b72; }
.code-block .string { color: #a5d6ff; }
.code-block .function { color: #d2a8ff; }
.code-block .number { color: #79c0ff; }

/* Tables */
.table-wrapper {
    overflow-x: auto;
    margin: 1rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--bg-secondary);
    color: var(--accent-primary);
    font-weight: 600;
}

td {
    color: var(--text-primary);
}

/* Notes & Alerts */
.note, .tip, .warning, .danger, .success {
    padding: 1rem;
    margin: 1rem 0;
    border-radius: var(--border-radius-md);
    position: relative;
    padding-left: 3rem;
}

.note::before, .tip::before, .warning::before, .danger::before, .success::before {
    position: absolute;
    left: 1rem;
    top: 1rem;
    font-size: 1.2rem;
}

.note { background: var(--bg-secondary); border-left: 4px solid var(--accent-primary); }
.note::before { content: "📘"; }
.tip { background: var(--bg-secondary); border-left: 4px solid var(--text-success); }
.tip::before { content: "💡"; }
.warning { background: var(--bg-secondary); border-left: 4px solid var(--text-warning); }
.warning::before { content: "⚠️"; }
.danger { background: var(--bg-secondary); border-left: 4px solid var(--text-error); }
.danger::before { content: "🚨"; }
.success { background: var(--bg-secondary); border-left: 4px solid var(--text-success); }
.success::before { content: "✅"; }

/* Step by Step */
.step {
    display: flex;
    gap: 1rem;
    margin: 1.5rem 0;
    align-items: flex-start;
}

.step-number {
    width: 36px;
    height: 36px;
    background: var(--accent-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

/* Keyboard Shortcuts */
.keyboard-shortcuts {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 1rem 0;
}

.shortcut {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-md);
    padding: 0.5rem 1rem;
    font-family: monospace;
    font-size: 0.9rem;
}

.shortcut kbd {
    background: var(--bg-primary);
    padding: 0.2rem 0.5rem;
    border-radius: var(--border-radius-sm);
    margin: 0 0.2rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.tab {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-radius: var(--border-radius-sm) var(--border-radius-sm) 0 0;
    font-size: 0.9rem;
}

.tab:hover {
    color: var(--accent-primary);
}

.tab.active {
    color: var(--accent-primary);
    border-bottom: 2px solid var(--accent-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* FAQ Accordion */
.faq-item {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0.5rem;
}

.faq-question {
    padding: 1rem;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-answer {
    padding: 0 1rem 1rem 1rem;
    display: none;
}

.faq-answer.active {
    display: block;
}

.faq-toggle {
    font-size: 1.2rem;
    transition: transform var(--transition-fast);
}

.faq-item.open .faq-toggle {
    transform: rotate(45deg);
}

/* Video Modal */
.video-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.95);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.video-modal-content {
    position: relative;
    width: 90%;
    max-width: 1000px;
}

.video-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.video-modal-close:hover {
    opacity: 0.7;
}

.video-container {
    background: #000;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-placeholder-inline {
    padding: 3rem;
    text-align: center;
    color: var(--text-secondary);
}

.video-loading {
    animation: pulse 1.5s infinite;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--accent-primary);
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    border: none;
    z-index: 99;
    font-size: 1.2rem;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
    color: var(--text-secondary);
}

.footer a {
    color: var(--accent-primary);
    text-decoration: none;
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-transition {
    animation: fadeIn 0.3s ease;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-left: 0.5rem;
    vertical-align: middle;
}

.badge-new { background: var(--text-success); color: var(--bg-primary); }
.badge-beta { background: var(--text-warning); color: var(--bg-primary); }
.badge-stable { background: var(--accent-primary); color: var(--bg-primary); }

.os-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

.os-linux { background: #f1c40f; color: var(--bg-primary); }
.os-macos { background: #8e44ad; color: white; }
.os-windows { background: #0078d4; color: white; }

.demo-badge {
    background: var(--gradient-success);
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-left: 0.5rem;
    vertical-align: middle;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    
    .hero {
        flex-direction: column;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons, .hero-stats {
        justify-content: center;
    }
    
    .nav {
        flex-direction: column;
    }
    
    .nav-links {
        justify-content: center;
    }
    
    .step {
        flex-direction: column;
    }
    
    .step-number {
        align-self: flex-start;
    }
    
    .image-row {
        flex-direction: column;
    }
    
    .tabs {
        justify-content: center;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}