/* Root Variables - Dark Theme */
:root {
    /* Dark Theme Colors */
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #262626;
    --bg-card: #1e1e1e;
    --bg-code: #141414;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a3a3a3;
    --text-muted: #737373;
    --text-accent: #60a5fa;
    
    /* Brand Colors */
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #6366f1;
    --accent: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Borders & Shadows */
    --border-primary: #404040;
    --border-secondary: #525252;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}

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

a:hover {
    color: var(--primary);
}

/* Layout Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section {
    padding: var(--space-2xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-xl);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-dark {
    background-color: var(--bg-secondary);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-primary);
    z-index: 1000;
    transition: background-color var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 600;
}

.nav-icon {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: 120px 0 var(--space-2xl);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--text-primary), var(--text-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-accent);
    margin-bottom: var(--space-sm);
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-normal);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-secondary);
}

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

/* Code Preview */
.code-preview {
    background-color: var(--bg-code);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-primary);
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-primary);
}

.code-dots {
    display: flex;
    gap: var(--space-xs);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

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

.code-title {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.code-content {
    padding: var(--space-md);
}

.code-content pre {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: auto;
}

/* Code syntax highlighting */
.code-content pre code {
    color: var(--text-primary);
}

/* Style comments in code blocks */
.code-content pre code .comment,
.code-content pre .comment {
    color: #60a5fa;
    font-style: italic;
}

/* Cards */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--space-xl);
}

.overview-card {
    background-color: var(--bg-card);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.overview-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.overview-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.overview-card p {
    margin-bottom: var(--space-md);
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.feature-list li {
    color: var(--text-secondary);
    font-size: 0.95rem;
    padding: var(--space-xs) 0;
}

/* Architecture Section */
.architecture-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.arch-diagram {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-md);
}

.arch-components {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.component {
    padding: var(--space-md);
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
}

.component h4 {
    color: var(--primary);
    margin-bottom: var(--space-sm);
}

/* Technology Stack */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.tech-category h3 {
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    font-size: 1.25rem;
}

.tech-items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tech-item {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-card));
    color: var(--text-secondary);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-primary);
    transition: all var(--transition-fast);
}

.tech-item:hover {
    color: var(--text-primary);
    border-color: var(--primary);
    transform: translateY(-1px);
}

/* Project Details */
.project-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.detail-card {
    background-color: var(--bg-card);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
}

.detail-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    font-size: 1.125rem;
}

.detail-card ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

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

.detail-card strong {
    color: var(--text-accent);
    font-weight: 500;
}

/* Quick Start Steps */
.quickstart-steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.step {
    display: flex;
    gap: var(--space-lg);
    align-items: flex-start;
}

.step-number {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.code-block {
    background-color: var(--bg-code);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    overflow-x: auto;
    margin-top: var(--space-md);
}

.code-block pre {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.access-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.access-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.access-link:hover {
    border-color: var(--primary);
    background-color: var(--bg-tertiary);
    transform: translateX(4px);
}

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

.link-url {
    margin-left: auto;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

/* API Documentation */
.api-sections {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.api-section {
    background-color: var(--bg-card);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
}

.api-section h3 {
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--primary);
}

.endpoint-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-lg);
}

.endpoint-category h4 {
    color: var(--text-accent);
    margin-bottom: var(--space-md);
    font-size: 1rem;
}

.endpoint {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xs);
    border: 1px solid var(--border-primary);
    transition: all var(--transition-fast);
}

.endpoint:hover {
    border-color: var(--primary);
    background-color: var(--bg-tertiary);
}

.method {
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 50px;
    text-align: center;
    color: white;
}

.method.get { background-color: var(--success); }
.method.post { background-color: var(--primary); }
.method.put { background-color: var(--warning); }
.method.delete { background-color: var(--error); }

.path {
    font-family: var(--font-mono);
    color: var(--text-primary);
    font-size: 0.875rem;
    flex: 1;
}

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

/* Use Cases */
.usecase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.usecase-card {
    background-color: var(--bg-card);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-normal);
}

.usecase-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.usecase-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.usecase-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.usecase-card p {
    margin-bottom: var(--space-lg);
    text-align: left;
}

.usecase-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
}

.feature-tag {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    font-weight: 500;
}

/* Video Demo Section */
.video-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.video-wrapper {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-primary);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-lg);
}

.video-description {
    padding: var(--space-lg);
}

.video-description h3 {
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    font-size: 1.5rem;
}

.video-description p {
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.video-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

/* Project Structure Section */
.structure-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.structure-overview {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.structure-overview h3 {
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.structure-overview p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.folder-structure {
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.folder-structure .code-block {
    background-color: var(--bg-code);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-primary);
}

.folder-structure .code-content {
    padding: var(--space-lg);
    max-height: 600px;
    overflow-y: auto;
}

.folder-structure pre {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin: 0;
}

/* Folder structure specific styling */
.folder-structure .comment {
    color: #60a5fa;
    font-style: italic;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.footer-section ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-section a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--text-accent);
}

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

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

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

.status-dot.green { background-color: var(--success); }
.status-dot.blue { background-color: var(--primary); }
.status-dot.purple { background-color: var(--accent); }

.footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-primary);
    color: var(--text-muted);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

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

.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-secondary);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--border-primary);
        padding: var(--space-lg) 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-lg);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .overview-grid {
        grid-template-columns: 1fr;
    }

    .architecture-container {
        grid-template-columns: 1fr;
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }

    .project-details {
        grid-template-columns: 1fr;
    }

    .endpoint-grid {
        grid-template-columns: 1fr;
    }

    .usecase-grid {
        grid-template-columns: 1fr;
    }

    .video-container {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .video-description {
        order: -1;
        text-align: center;
        padding: var(--space-md);
    }

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

    .hero-buttons {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .overview-card,
    .detail-card,
    .api-section,
    .usecase-card {
        padding: var(--space-md);
    }
}

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

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

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

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

/* Selection Styling */
::selection {
    background-color: var(--primary);
    color: white;
}

/* Focus Styles */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Smooth Transitions */
* {
    transition: background-color var(--transition-fast), 
                border-color var(--transition-fast), 
                color var(--transition-fast);
}