/* ============================================
   AI in Civic Tech Guide - Styles
   ============================================ */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Colors - Light Theme */
    --primary: #0366d6;
    --primary-dark: #0256c4;
    --primary-light: #5094e8;
    --secondary: #6f42c1;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;

    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #e1e4e8;
    --text-primary: #24292e;
    --text-secondary: #586069;
    --text-muted: #6a737d;
    --border: #e1e4e8;
    --shadow: rgba(0, 0, 0, 0.1);

    /* Sidebar */
    --sidebar-width: 280px;
    --sidebar-bg: #f6f8fa;
    --sidebar-border: #e1e4e8;

    /* Header */
    --header-height: 64px;
    --header-bg: #ffffff;
    --header-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Border Radius */
    --radius-sm: 3px;
    --radius-md: 6px;
    --radius-lg: 12px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
}

/* Dark Theme */
body.dark-theme {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --border: #30363d;
    --shadow: rgba(0, 0, 0, 0.3);

    --sidebar-bg: #161b22;
    --sidebar-border: #30363d;
    --header-bg: #0d1117;
    --header-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--header-bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--header-shadow);
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-lg);
    max-width: 100%;
}

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

.header-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.emoji {
    font-size: 1.5rem;
}

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

/* Menu Toggle (Mobile) */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Search */
.search-container {
    position: relative;
    width: 300px;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 2.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-primary);
}

.search-clear {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 var(--spacing-sm);
    display: none;
}

.search-input:not(:placeholder-shown) + .search-clear {
    display: block;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
}

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

/* ============================================
   Layout
   ============================================ */
.container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 90;
    transition: transform var(--transition-base);
}

.sidebar::-webkit-scrollbar {
    width: 8px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

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

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

/* Main Content */
.main {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: var(--spacing-xxl);
    max-width: 1200px;
    width: 100%;
}

.content {
    max-width: 900px;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    padding: var(--spacing-lg);
}

.nav-section {
    margin-bottom: var(--spacing-lg);
}

.nav-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: var(--spacing-sm) 0;
    letter-spacing: 0.5px;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin: var(--spacing-xs) 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    font-size: 0.9rem;
}

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

.nav-link.active {
    background: var(--primary);
    color: white;
    font-weight: 500;
}

.nav-link-icon {
    font-size: 1rem;
}

.nav-loading {
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-muted);
}

/* ============================================
   Content Header
   ============================================ */
.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.breadcrumb {
    font-size: 0.9rem;
    color: var(--text-muted);
}

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

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

.print-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.print-btn:hover {
    background: var(--bg-tertiary);
}

/* ============================================
   Markdown Content
   ============================================ */
.markdown-content {
    animation: fadeIn 0.3s ease;
}

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

.markdown-content h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

.markdown-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: var(--spacing-xxl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.markdown-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.markdown-content h4, .markdown-content h5, .markdown-content h6 {
    font-weight: 600;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.markdown-content p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

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

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

.markdown-content ul, .markdown-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.markdown-content li {
    margin-bottom: var(--spacing-sm);
}

.markdown-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-content em {
    font-style: italic;
}

.markdown-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: var(--spacing-xxl) 0;
}

/* Code */
.markdown-content code {
    background: var(--bg-secondary);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--text-primary);
}

.markdown-content pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.markdown-content pre code {
    background: none;
    padding: 0;
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Tables */
.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
}

.markdown-content th,
.markdown-content td {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    text-align: left;
}

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

.markdown-content tr:hover {
    background: var(--bg-secondary);
}

/* Blockquotes */
.markdown-content blockquote {
    border-left: 4px solid var(--primary);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* Images */
.markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
}

/* ============================================
   Welcome Screen
   ============================================ */
.welcome-screen h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.lead {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xxl);
}

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

.welcome-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: var(--transition-base);
}

.welcome-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px var(--shadow);
}

.welcome-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

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

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

.quick-start {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xxl);
}

.quick-start h2 {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
}

.quick-start ul {
    list-style: none;
    padding: 0;
}

.quick-start li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border);
}

.quick-start li:last-child {
    border-bottom: none;
}

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

.stat {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   Search Results
   ============================================ */
.search-results {
    animation: fadeIn 0.3s ease;
}

.search-result {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.search-result:hover {
    border-color: var(--primary);
    transform: translateX(4px);
}

.search-result-title {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.search-result-path {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.search-result-excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.search-result mark {
    background: var(--warning);
    padding: 0.1em 0.2em;
    border-radius: var(--radius-sm);
}

/* ============================================
   Loading & Error States
   ============================================ */
.loading-state,
.error-state {
    text-align: center;
    padding: var(--spacing-xxl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   Navigation Buttons
   ============================================ */
.content-footer {
    margin-top: var(--spacing-xxl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border);
}

.nav-buttons {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.nav-button {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.nav-button:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: var(--spacing-lg);
    text-align: center;
    margin-top: var(--spacing-xxl);
}

.footer-content {
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.separator {
    margin: 0 var(--spacing-sm);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main {
        margin-left: 0;
        padding: var(--spacing-lg);
    }

    .menu-toggle {
        display: flex;
    }

    .overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 85;
        display: none;
    }

    .overlay.active {
        display: block;
    }

    .search-container {
        width: 200px;
    }

    .header-title {
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    .header-title span:not(.emoji) {
        display: none;
    }

    .search-container {
        width: 150px;
    }

    .search-input {
        font-size: 0.85rem;
    }

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

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

    .main {
        padding: var(--spacing-md);
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .header,
    .sidebar,
    .footer,
    .content-header,
    .content-footer,
    .search-results {
        display: none !important;
    }

    .main {
        margin-left: 0;
        padding: 0;
        max-width: 100%;
    }

    .markdown-content {
        font-size: 12pt;
        line-height: 1.5;
    }

    .markdown-content h1 {
        font-size: 24pt;
        page-break-after: avoid;
    }

    .markdown-content h2 {
        font-size: 18pt;
        page-break-after: avoid;
    }

    .markdown-content pre {
        page-break-inside: avoid;
    }

    .markdown-content a {
        color: #000;
        text-decoration: underline;
    }

    .markdown-content a[href]:after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
    }
}

/* ============================================
   Utilities
   ============================================ */
.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-primary:hover {
    background: var(--primary-dark);
}