/**
 * Helpdesk Knowledge Base - Public Styles
 */

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f7fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: #4a6cf7;
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: #3451b2;
}

img {
    max-width: 100%;
    height: auto;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    background: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1a1a2e;
}

.logo:hover {
    color: #4a6cf7;
}

.main-nav a {
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 500;
    transition: background 0.2s;
}

.main-nav a:hover {
    background: #f0f4ff;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #4a6cf7 0%, #6366f1 100%);
    padding: 60px 0;
    text-align: center;
    color: #fff;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    font-weight: 700;
}

/* Search Form */
.search-form {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
    background: #fff;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
}

.search-form input {
    flex: 1;
    padding: 18px 25px;
    border: none;
    font-size: 1rem;
    outline: none;
}

.search-form button {
    padding: 18px 35px;
    background: #1a1a2e;
    color: #fff;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.search-form button:hover {
    background: #2d2d44;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 40px 20px;
}

/* Categories Section */
.categories-section h2,
.recent-section h2,
.search-results h2 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: #1a1a2e;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.category-card {
    background: #fff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.2s, box-shadow 0.2s;
    display: block;
    color: inherit;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    color: inherit;
}

.category-icon {
    width: 50px;
    height: 50px;
    background: #f0f4ff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    color: #4a6cf7;
}

.category-card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: #1a1a2e;
}

.category-card p {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.article-count {
    font-size: 0.85rem;
    color: #888;
    font-weight: 500;
}

/* Articles List */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.article-card {
    background: #fff;
    padding: 20px 25px;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    transition: box-shadow 0.2s;
}

.article-card:hover {
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.article-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.article-card h3 a {
    color: #1a1a2e;
}

.article-card h3 a:hover {
    color: #4a6cf7;
}

.article-card p {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.article-card .date {
    font-size: 0.85rem;
    color: #999;
}

.category-tag {
    display: inline-block;
    padding: 4px 10px;
    background: #f0f4ff;
    color: #4a6cf7;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 10px;
}

/* Breadcrumb */
.breadcrumb {
    margin-bottom: 25px;
    font-size: 0.9rem;
    color: #666;
}

.breadcrumb a {
    color: #666;
}

.breadcrumb a:hover {
    color: #4a6cf7;
}

.breadcrumb .separator {
    margin: 0 8px;
    color: #ccc;
}

/* Page Header */
.page-header {
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 2rem;
    color: #1a1a2e;
    margin-bottom: 10px;
}

.page-header .description {
    color: #666;
    font-size: 1.1rem;
}

/* Article Layout */
.article-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 40px;
    align-items: start;
}

@media (max-width: 900px) {
    .article-layout {
        grid-template-columns: 1fr;
    }
}

.article-main {
    min-width: 0;
}

.article-full {
    background: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.article-header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.article-header h1 {
    font-size: 1.8rem;
    color: #1a1a2e;
    margin-bottom: 15px;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    font-size: 0.9rem;
    color: #666;
}

.article-meta .category a {
    color: #4a6cf7;
}

/* Article Content */
.article-content {
    font-size: 1rem;
    line-height: 1.8;
}

.article-content h2 {
    font-size: 1.4rem;
    margin: 30px 0 15px;
    color: #1a1a2e;
}

.article-content h3 {
    font-size: 1.2rem;
    margin: 25px 0 12px;
    color: #1a1a2e;
}

.article-content p {
    margin-bottom: 15px;
}

.article-content ul,
.article-content ol {
    margin: 15px 0;
    padding-left: 25px;
}

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

.article-content pre {
    background: #1a1a2e;
    color: #e2e8f0;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
}

.article-content code {
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

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

.article-content blockquote {
    border-left: 4px solid #4a6cf7;
    padding-left: 20px;
    margin: 20px 0;
    color: #555;
    font-style: italic;
}

.article-content img {
    border-radius: 8px;
    margin: 20px 0;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.article-content th,
.article-content td {
    padding: 12px;
    border: 1px solid #e2e8f0;
    text-align: left;
}

.article-content th {
    background: #f8fafc;
    font-weight: 600;
}

/* Sidebar */
.article-sidebar {
    background: #fff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    position: sticky;
    top: 90px;
}

.article-sidebar h3 {
    font-size: 1rem;
    margin-bottom: 15px;
    color: #1a1a2e;
}

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

.related-list li {
    padding: 10px 0;
    border-bottom: 1px solid #f1f5f9;
}

.related-list li:last-child {
    border-bottom: none;
}

.related-list a {
    color: #444;
    font-size: 0.95rem;
}

.related-list a:hover {
    color: #4a6cf7;
}

/* Navigation */
.article-nav {
    margin-top: 30px;
}

.back-link {
    color: #666;
    font-weight: 500;
}

.back-link:hover {
    color: #4a6cf7;
}

.back-nav {
    margin-top: 30px;
}

/* Error Page */
.error-page {
    text-align: center;
    padding: 60px 20px;
}

.error-page h1 {
    font-size: 2rem;
    color: #1a1a2e;
    margin-bottom: 15px;
}

.error-page p {
    color: #666;
    margin-bottom: 25px;
}

/* Button */
.btn {
    display: inline-block;
    padding: 12px 25px;
    background: #4a6cf7;
    color: #fff;
    border-radius: 8px;
    font-weight: 600;
    transition: background 0.2s;
}

.btn:hover {
    background: #3451b2;
    color: #fff;
}

/* No Content */
.no-content,
.no-results {
    text-align: center;
    padding: 40px;
    color: #666;
    background: #fff;
    border-radius: 10px;
}

/* Recent Section */
.recent-section {
    margin-top: 50px;
}

/* Footer */
.site-footer {
    background: #1a1a2e;
    color: #888;
    padding: 25px 0;
    margin-top: auto;
    text-align: center;
}

.site-footer p {
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .search-form {
        flex-direction: column;
        border-radius: 12px;
    }

    .search-form input {
        border-bottom: 1px solid #eee;
    }

    .search-form button {
        border-radius: 0;
    }

    .article-full {
        padding: 25px;
    }

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