:root {
    /* Color System - Red & White Theme */
    --red-400: #f87171;
    --red-500: #ef4444;
    --red-600: #dc2626;
    --red-700: #b91c1c;
    --red-800: #991b1b;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f5f5f5;
    --bg-card: #ffffff;
    --bg-hover: #fee2e2;
    
    /* Text Colors */
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    
    /* Border Colors */
    --border: #e5e7eb;
    --border-light: #f3f4f6;
    --border-red: #fca5a5;
    
    /* Accent Colors */
    --accent-gradient: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
    --success: #dc2626;
    --info: #ef4444;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(220, 38, 38, 0.2);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    font-size: 0.95rem;
}

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

.github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.github-link:hover {
    border-color: var(--red-600);
    background: var(--bg-hover);
    color: var(--red-600);
}

/* Hero Section */
.hero {
    padding: 6rem 2rem;
    text-align: center;
    background: radial-gradient(circle at top, rgba(220, 38, 38, 0.05) 0%, transparent 50%);
}

.hero-container {
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.badge-icon {
    font-size: 1.25rem;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.875rem 2rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(220, 38, 38, 0.4);
}

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

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--red-600);
    color: var(--red-600);
}

/* Section Containers */
.section-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 5rem 2rem;
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 4rem;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--red-600);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Quick Start Section */
.quickstart {
    background: var(--bg-primary);
}

.steps-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.step-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    gap: 2rem;
    transition: all 0.3s;
}

.step-card:hover {
    border-color: var(--border-light);
}

.step-card.highlight {
    border-color: var(--red-600);
    box-shadow: 0 0 0 1px var(--red-600), var(--shadow-glow);
}

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--accent-gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.step-content > p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.step-content a {
    color: var(--red-600);
    text-decoration: none;
    font-weight: 500;
}

.step-content a:hover {
    text-decoration: underline;
}

.step-note {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.step-note.success {
    color: var(--success);
    font-weight: 500;
}

/* Info Box */
.info-box {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: rgba(220, 38, 38, 0.05);
    border: 1px solid rgba(220, 38, 38, 0.15);
    border-radius: 10px;
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.info-box svg {
    flex-shrink: 0;
    color: var(--red-600);
    margin-top: 0.125rem;
}

/* Code Block */
.code-block {
    position: relative;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 1rem 1.25rem;
    border-radius: 10px;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    overflow-x: auto;
    margin-top: 1rem;
}

.code-block.large {
    font-size: 1.1rem;
    padding: 1.25rem 1.5rem;
}

.code-block code {
    flex: 1;
    color: var(--text-primary);
    white-space: nowrap;
}

.copy-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.copy-btn:hover {
    background: var(--bg-hover);
    border-color: var(--red-600);
    color: var(--red-600);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tab-btn {
    padding: 0.625rem 1.25rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.tab-btn:hover {
    border-color: var(--border-light);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
}

.tab-content {
    display: none;
}

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

/* Usage Section */
.usage {
    background: var(--bg-secondary);
}

.usage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.usage-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s;
}

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

.usage-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.usage-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.usage-tag {
    padding: 0.25rem 0.75rem;
    background: rgba(220, 38, 38, 0.1);
    border: 1px solid rgba(220, 38, 38, 0.2);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--red-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Platforms Section */
.platforms {
    background: var(--bg-primary);
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.platform-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s;
}

.platform-card:hover {
    border-color: var(--red-600);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.platform-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.platform-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.platform-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 3rem 2rem;
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

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

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s;
    pointer-events: none;
    z-index: 1000;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toast svg {
    color: var(--success);
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .nav-links a {
        font-size: 0.875rem;
    }
    
    .github-link span {
        display: none;
    }
    
    .hero {
        padding: 4rem 1.5rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .section-container {
        padding: 3rem 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1.1rem;
    }
    
    .features-grid,
    .usage-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .step-card {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .code-block {
        font-size: 0.8rem;
        padding: 0.875rem 1rem;
    }
    
    .platforms-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-content {
        align-items: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        flex: 1;
        min-width: 80px;
        font-size: 0.8rem;
        padding: 0.5rem 0.75rem;
    }
}

/* Smooth Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card,
.step-card,
.usage-card,
.platform-card {
    animation: fadeInUp 0.6s ease-out backwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}