/* ===================================
   TLD2 Website - Main Stylesheet
   =================================== */

/* CSS Variables */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Light mode colors */
    --bg-light: #ffffff;
    --bg-light-secondary: #f8f9fa;
    --text-light: #1a1a1a;
    --text-light-muted: #666666;
    --border-light: #e0e0e0;

    /* Dark mode colors */
    --bg-dark: #0a0e1a;
    --bg-dark-secondary: #1e1e1e;
    --text-dark: #e0e0e0;
    --text-dark-muted: #aaaaaa;
    --border-dark: #333333;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-light);
    background: var(--bg-light);
    font-size: 16px;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    body {
        color: var(--text-dark);
        background: var(--bg-dark);
    }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 16px;
}

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

a:hover {
    text-decoration: underline;
}

/* Header */
header {
    background: var(--bg-light);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

@media (prefers-color-scheme: dark) {
    header {
        background: var(--bg-dark);
        border-bottom-color: var(--border-dark);
    }
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

header .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

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

header .nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

@media (prefers-color-scheme: dark) {
    header .nav-links a {
        color: var(--text-dark);
    }
}

header .nav-links a:hover {
    color: var(--primary);
    text-decoration: none;
}

header .nav-links a.active {
    color: var(--primary);
}

/* Breadcrumb */
.breadcrumb {
    padding: 24px 0;
    font-size: 0.875rem;
    color: var(--text-light-muted);
}

@media (prefers-color-scheme: dark) {
    .breadcrumb {
        color: var(--text-dark-muted);
    }
}

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

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

/* Article Content */
.article-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px;
}

.article-content h1 {
    margin-bottom: 8px;
}

.article-meta {
    color: var(--text-light-muted);
    font-size: 0.9375rem;
    margin-bottom: 32px;
}

@media (prefers-color-scheme: dark) {
    .article-meta {
        color: var(--text-dark-muted);
    }
}

.article-content section {
    margin-bottom: 48px;
}

.article-content ul, .article-content ol {
    margin-left: 24px;
    margin-bottom: 16px;
}

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

.article-content pre {
    background: var(--bg-light-secondary);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 16px;
    font-size: 0.875rem;
}

@media (prefers-color-scheme: dark) {
    .article-content pre {
        background: var(--bg-dark-secondary);
        border-color: var(--border-dark);
    }
}

.article-content code {
    background: var(--bg-light-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
}

@media (prefers-color-scheme: dark) {
    .article-content code {
        background: var(--bg-dark-secondary);
    }
}

.article-content pre code {
    background: none;
    padding: 0;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 24px;
}

.article-content table th,
.article-content table td {
    padding: 12px;
    text-align: left;
    border: 1px solid var(--border-light);
}

@media (prefers-color-scheme: dark) {
    .article-content table th,
    .article-content table td {
        border-color: var(--border-dark);
    }
}

.article-content table th {
    background: var(--bg-light-secondary);
    font-weight: 600;
}

@media (prefers-color-scheme: dark) {
    .article-content table th {
        background: var(--bg-dark-secondary);
    }
}

.article-content table tbody tr:hover {
    background: var(--bg-light-secondary);
}

@media (prefers-color-scheme: dark) {
    .article-content table tbody tr:hover {
        background: var(--bg-dark-secondary);
    }
}

.table-note {
    font-size: 0.875rem;
    color: var(--text-light-muted);
    font-style: italic;
    margin-top: -16px;
    margin-bottom: 24px;
}

@media (prefers-color-scheme: dark) {
    .table-note {
        color: var(--text-dark-muted);
    }
}

/* Info Boxes */
.info-box {
    background: #f0f7ff;
    border-left: 4px solid var(--primary);
    padding: 24px;
    border-radius: 4px;
    margin-bottom: 32px;
}

@media (prefers-color-scheme: dark) {
    .info-box {
        background: #1a2845;
    }
}

.info-box h3 {
    margin-top: 0;
    margin-bottom: 12px;
}

.summary-box {
    background: #f0fdf4;
    border-left: 4px solid var(--success);
    padding: 24px;
    border-radius: 4px;
    margin-bottom: 32px;
}

@media (prefers-color-scheme: dark) {
    .summary-box {
        background: #0f2818;
    }
}

.issue-card {
    background: var(--bg-light-secondary);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 24px;
}

@media (prefers-color-scheme: dark) {
    .issue-card {
        background: var(--bg-dark-secondary);
        border-color: var(--border-dark);
    }
}

.issue-card h4 {
    color: var(--primary);
    margin-bottom: 12px;
}

/* Cards & Grids */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.doc-card, .card {
    background: var(--bg-light-secondary);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 24px;
    text-decoration: none;
    color: var(--text-light);
    transition: transform 0.2s, box-shadow 0.2s;
    display: block;
}

@media (prefers-color-scheme: dark) {
    .doc-card, .card {
        background: var(--bg-dark-secondary);
        border-color: var(--border-dark);
        color: var(--text-dark);
    }
}

.doc-card:hover, .card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    text-decoration: none;
}

.doc-card.featured {
    border: 2px solid var(--primary);
    background: linear-gradient(135deg, #f0f7ff 0%, #e0f2fe 100%);
}

@media (prefers-color-scheme: dark) {
    .doc-card.featured {
        background: linear-gradient(135deg, #1a2845 0%, #1e3a5f 100%);
    }
}

.doc-card h3, .card h3 {
    margin: 0 0 12px 0;
    color: var(--text-light);
}

@media (prefers-color-scheme: dark) {
    .doc-card h3, .card h3 {
        color: var(--text-dark);
    }
}

.doc-card p, .card p {
    margin: 0;
    color: var(--text-light-muted);
    line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
    .doc-card p, .card p {
        color: var(--text-dark-muted);
    }
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary);
    color: white;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-top: 12px;
}

/* Sections */
.doc-section {
    margin: 60px 0;
}

.doc-section h2 {
    font-size: 2rem;
    margin-bottom: 32px;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 60px 0 40px;
}

.hero-section h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light-muted);
    max-width: 800px;
    margin: 0 auto;
}

@media (prefers-color-scheme: dark) {
    .hero-subtitle {
        color: var(--text-dark-muted);
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s, transform 0.2s;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    text-decoration: none;
}

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

@media (prefers-color-scheme: dark) {
    .btn-secondary {
        background: var(--bg-dark-secondary);
    }
}

.btn-secondary:hover {
    background: #f0f7ff;
    text-decoration: none;
}

@media (prefers-color-scheme: dark) {
    .btn-secondary:hover {
        background: #2a2a2a;
    }
}

/* Footer */
footer {
    background: var(--bg-light-secondary);
    border-top: 1px solid var(--border-light);
    margin-top: 80px;
    padding: 48px 0 24px;
}

@media (prefers-color-scheme: dark) {
    footer {
        background: var(--bg-dark-secondary);
        border-top-color: var(--border-dark);
    }
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    margin-bottom: 16px;
    font-size: 1.125rem;
}

.footer-section p {
    color: var(--text-light-muted);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

@media (prefers-color-scheme: dark) {
    .footer-section p {
        color: var(--text-dark-muted);
    }
}

.footer-section a {
    display: block;
    color: var(--text-light-muted);
    text-decoration: none;
    margin-bottom: 8px;
    font-size: 0.9375rem;
}

@media (prefers-color-scheme: dark) {
    .footer-section a {
        color: var(--text-dark-muted);
    }
}

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

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-light);
}

@media (prefers-color-scheme: dark) {
    .footer-bottom {
        border-top-color: var(--border-dark);
    }
}

.footer-bottom p {
    color: var(--text-light-muted);
    font-size: 0.875rem;
}

@media (prefers-color-scheme: dark) {
    .footer-bottom p {
        color: var(--text-dark-muted);
    }
}

/* Responsive */
@media (max-width: 768px) {
    header nav {
        flex-direction: column;
        gap: 16px;
    }

    header .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 40px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 40px; }