/* ===========================
   Variables & Reset
   =========================== */
:root {
    /* Colors - Light Mode */
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #06b6d4;
    
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-code: #1e293b;
    
    /* Text */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;
    
    /* Borders */
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    
    /* 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);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    /* Dark Mode Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-code: #0a0f1e;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #64748b;
    
    --border-color: #334155;
    
    --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);
}

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

html {
    scroll-behavior: smooth;
}

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

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.navbar .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-xs);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    width: 40px;
    height: 40px;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    color: var(--text-primary);
}

.sun-icon {
    display: block;
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* ===========================
   Sidebar
   =========================== */
.sidebar {
    position: fixed;
    top: 73px;
    left: 0;
    width: 280px;
    height: calc(100vh - 73px);
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: var(--spacing-lg);
    z-index: 100;
}

.sidebar-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.sidebar-link {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    margin-bottom: 4px;
    font-size: 0.95rem;
}

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

.sidebar-link.active {
    background: var(--primary);
    color: var(--text-inverse);
    font-weight: 500;
}

/* ===========================
   Main Content
   =========================== */
.main-content {
    margin-left: 280px;
    margin-top: 73px;
    padding: var(--spacing-xl) 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
}

.badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text-inverse);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-endpoint {
    display: inline-block;
    background: var(--bg-code);
    color: #10b981;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-family: var(--font-mono);
    font-size: 1.125rem;
    box-shadow: var(--shadow-lg);
}

/* ===========================
   Sections
   =========================== */
.section {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section-title i {
    color: var(--secondary);
    margin-right: 12px;
}

.section-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 1.05rem;
}

/* ===========================
   Info Grid
   =========================== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.info-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition);
}

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

.info-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.info-icon i {
    color: var(--primary);
}

.info-card h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.info-card code {
    background: var(--bg-code);
    color: var(--primary-light);
    padding: 6px 12px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

/* ===========================
   Alerts
   =========================== */
.alert {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid;
}

.alert-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.alert strong {
    display: block;
    margin-bottom: 4px;
}

.alert p {
    margin: 0;
}

.alert code {
    background: rgba(0, 0, 0, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--warning);
    color: var(--text-primary);
}

.alert-warning .alert-icon {
    color: var(--warning);
}

.alert-info {
    background: rgba(6, 182, 212, 0.1);
    border-color: var(--info);
    color: var(--text-primary);
}

.alert-info .alert-icon {
    color: var(--info);
}

/* ===========================
   Code Blocks
   =========================== */
.code-block {
    background: var(--bg-code);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.code-language {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.copy-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    padding: 6px 10px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
}

.copy-btn svg {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
}

.code-block pre {
    margin: 0;
    padding: var(--spacing-lg);
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
    color: #e2e8f0;
}

/* ===========================
   Parameter Cards
   =========================== */
.param-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.param-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.param-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
    font-family: var(--font-mono);
}

.badge-required {
    background: var(--error);
    color: var(--text-inverse);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-optional {
    background: var(--text-tertiary);
    color: var(--text-inverse);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.param-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.param-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.param-detail {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.param-detail strong {
    color: var(--text-primary);
    margin-right: 8px;
}

.param-detail code {
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--primary);
}

/* ===========================
   Feature Cards
   =========================== */
.feature-card {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(139, 92, 246, 0.05));
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.feature-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.feature-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.feature-icon i {
    color: var(--primary);
}

.feature-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.feature-header code {
    background: var(--bg-code);
    color: var(--primary-light);
    padding: 4px 10px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.feature-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
}

.feature-benefits {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.benefit {
    background: var(--bg-primary);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

.benefit i {
    color: var(--success);
    margin-right: 8px;
}

/* ===========================
   Signature Preview
   =========================== */
.signature-preview {
    background: var(--bg-primary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-lg);
    display: flex;
    justify-content: center;
}

.signature-box {
    text-align: center;
}

.signature-image {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    font-family: 'Brush Script MT', cursive;
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.signature-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.signature-info div {
    margin: 2px 0;
}

/* ===========================
   Tabs
   =========================== */
.tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
}

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

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

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

/* ===========================
   Response Cards
   =========================== */
.response-card {
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.response-card.success {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--success);
}

.response-card.error {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--error);
}

.response-header h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.error-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.error-item {
    display: flex;
    gap: var(--spacing-md);
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
}

.error-code {
    background: var(--error);
    color: var(--text-inverse);
    padding: 4px 12px;
    border-radius: 6px;
    font-weight: 700;
    font-family: var(--font-mono);
    height: fit-content;
}

.error-desc {
    flex: 1;
}

.error-desc strong {
    display: block;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.error-desc code {
    background: var(--bg-tertiary);
    padding: var(--spacing-sm);
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    display: block;
    margin-top: 8px;
    color: var(--text-secondary);
}

/* ===========================
   Use Case Grid
   =========================== */
.use-case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.use-case-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    transition: var(--transition);
}

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

.use-case-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.use-case-card h3 i {
    color: var(--primary);
    margin-right: 8px;
}

.use-case-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.use-case-card .code-block {
    margin-bottom: 0;
}

/* ===========================
   Timeline
   =========================== */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
}

.timeline-badge {
    position: absolute;
    left: -40px;
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: var(--text-inverse);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    box-shadow: 0 0 0 4px var(--bg-primary);
}

.timeline-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
}

.timeline-content h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary);
}

.timeline-content ul {
    list-style: none;
    padding: 0;
}

.timeline-content li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

.timeline-content li i {
    color: var(--success);
    margin-right: 8px;
}

.timeline-content code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--primary);
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

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

.footer-section h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.footer-section p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 4px 0;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section {
        padding: var(--spacing-lg);
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-header {
        flex-direction: column;
        text-align: center;
    }
    
    .use-case-grid {
        grid-template-columns: 1fr;
    }
    
    .navbar .container {
        padding: 0 var(--spacing-sm);
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* ===========================
   Animations
   =========================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeIn 0.6s ease-out;
}

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

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

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

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

/* ===========================
   Print Styles
   =========================== */
@media print {
    .navbar,
    .sidebar,
    .theme-toggle,
    .copy-btn {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
        margin-top: 0;
    }
    
    .section {
        page-break-inside: avoid;
    }
}