/**
 * ULDL Designer Help Center - Shared Styles
 *
 * This stylesheet contains all common styles used across help pages.
 * Page-specific styles should be added inline or in separate stylesheets.
 */

/* ==========================================
   CSS Variables (Theme Support)
   ========================================== */
:root {
    --bg-primary: #0d0d0d;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --accent: #7c3aed;
    --accent-hover: #8b5cf6;
    --border: #333333;
    --success: #22c55e;
    --info: #3b82f6;
    --warning: #f59e0b;
}

[data-theme="light"] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e9ecef;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --border: #e5e7eb;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* ==========================================
   Header
   ========================================== */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

[data-theme="light"] .logo img {
    filter: invert(1);
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 48px;
    display: block;
}

.header-nav {
    display: flex;
    gap: 32px;
}

.header-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.header-nav a.active {
    color: var(--accent);
    font-weight: 600;
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 10px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    padding: 0;
}

.mobile-menu-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ==========================================
   Theme Toggle & Action Buttons
   ========================================== */
.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    padding: 0;
    margin-left: 16px;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="light"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="light"] .theme-toggle .moon-icon {
    display: none;
}

/* ==========================================
   Main Content
   ========================================== */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 24px;
}

/* ==========================================
   Section Styles
   ========================================== */
.section {
    margin-bottom: 60px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.section-title {
    font-size: 24px;
    font-weight: 600;
}

.section-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.section-link:hover {
    text-decoration: underline;
}

/* ==========================================
   Category Cards
   ========================================== */
.categories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.category-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    text-decoration: none;
    color: var(--text-primary);
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.category-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 24px;
}

.category-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.category-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.article-count {
    font-size: 12px;
    color: var(--text-muted);
}

/* ==========================================
   Quick Start Cards
   ========================================== */
.quick-start {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.quick-card {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: transform 0.2s, border-color 0.2s;
}

.quick-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

.quick-card-icon {
    width: 56px;
    height: 56px;
    background: var(--accent);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    flex-shrink: 0;
}

.quick-card-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.quick-card-content p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ==========================================
   Badges
   ========================================== */
.badge {
    display: inline-block;
    background: var(--accent);
    color: white;
    font-size: 10px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
    margin-left: 8px;
    text-transform: uppercase;
}

.badge.new {
    background: var(--success);
}

.badge.beta {
    background: var(--warning);
}

/* ==========================================
   Article List
   ========================================== */
.articles-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 16px;
}

.article-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-primary);
    transition: border-color 0.2s, background 0.2s;
}

.article-item:hover {
    border-color: var(--accent);
    background: var(--bg-tertiary);
}

.article-icon {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.article-item h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
}

.article-item p {
    font-size: 12px;
    color: var(--text-muted);
}

/* ==========================================
   Search
   ========================================== */
.search-container {
    max-width: 600px;
    margin: 0 auto;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px 20px;
    gap: 12px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

.search-icon {
    color: var(--text-muted);
}

.search-box input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-shortcut {
    background: var(--bg-secondary);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 12px;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    padding: 80px 24px;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #ffffff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

[data-theme="light"] .hero h1 {
    background: linear-gradient(135deg, #111827 0%, #4b5563 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

.hero p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
}

/* ==========================================
   Breadcrumb
   ========================================== */
.breadcrumb {
    max-width: 900px;
    margin: 0 auto;
    padding: 16px 24px;
}

.breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
}

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

.breadcrumb span {
    color: var(--text-muted);
    margin: 0 8px;
}

/* ==========================================
   Article Content
   ========================================== */
.article {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

.article-header h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.article-meta {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 40px;
}

.article-content h2 {
    font-size: 24px;
    font-weight: 600;
    margin: 48px 0 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.article-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 32px 0 16px;
}

.article-content p {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.article-content ul,
.article-content ol {
    margin: 0 0 20px 24px;
    color: var(--text-secondary);
}

.article-content li {
    margin-bottom: 10px;
}

.article-content code {
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, monospace;
    font-size: 14px;
}

/* ==========================================
   Step Box
   ========================================== */
.step-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin: 24px 0;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--accent);
    border-radius: 50%;
    font-weight: 600;
    font-size: 14px;
    margin-right: 12px;
    color: white;
}

.step-box h4 {
    display: inline;
    font-size: 16px;
    font-weight: 600;
}

.step-box p {
    margin: 16px 0 0 44px;
    color: var(--text-secondary);
}

/* ==========================================
   Tip Box
   ========================================== */
.tip-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 12px;
    padding: 20px 24px;
    margin: 24px 0;
}

.tip-label {
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    margin-bottom: 8px;
    color: #3b82f6;
}

.tip-box p {
    margin: 0;
    color: var(--text-secondary);
}

/* ==========================================
   Shortcut Table
   ========================================== */
.shortcut-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
}

.shortcut-table th,
.shortcut-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.shortcut-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    font-size: 14px;
}

.shortcut-table td {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 60px 24px 32px;
    margin-top: 80px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px 24px;
}

.footer-brand {
    grid-column: 1 / -1;
    max-width: 450px;
}

.footer-brand h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--accent) 0%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s;
    text-decoration: none;
}

.social-link:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    transform: translateY(-2px);
}

.footer-section h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 12px;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

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

.footer-bottom {
    max-width: 1200px;
    margin: 40px auto 0;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-muted);
}

.footer-bottom-left,
.footer-bottom-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.footer-divider {
    color: var(--border);
    user-select: none;
}

/* ==========================================
   Responsive Design
   ========================================== */

/* Tablet screens */
@media (max-width: 1024px) {
    .header-nav {
        gap: 20px;
    }

    .header-nav a {
        font-size: 13px;
    }
}

/* Mobile screens */
@media (max-width: 768px) {
    .header-content {
        padding: 12px 16px;
    }

    .logo img {
        height: 40px;
    }

    /* Show mobile menu toggle */
    .mobile-menu-toggle {
        display: flex;
    }

    /* Hide desktop nav by default, show when menu is open */
    .header-nav {
        display: none !important;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-top: 1px solid var(--border);
        flex-direction: column;
        gap: 0;
        padding: 8px 0;
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
        z-index: 1000;
    }

    .header-nav.mobile-open {
        display: flex !important;
    }

    .header-nav a {
        padding: 12px 24px;
        font-size: 15px;
        border-bottom: 1px solid var(--border);
    }

    .header-nav a:last-child {
        border-bottom: none;
    }

    .hero h1 {
        font-size: 32px;
    }

    .article-header h1 {
        font-size: 28px;
    }

    .footer-content {
        grid-template-columns: 1fr !important;
        gap: 24px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .footer-bottom-left,
    .footer-bottom-right {
        flex-direction: column;
        gap: 8px;
    }

    .footer-divider {
        display: none;
    }

    .quick-start {
        grid-template-columns: 1fr;
    }

    .articles-list {
        grid-template-columns: 1fr;
    }
}