/* Reset & Base Styles */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --primary: #165DFF;
    --primary-dark: #0E42D2;
    --accent: #00C48C;
    --text: #1D2129;
    --text-light: #86909C;
    --bg: #F5F7FA;
    --card-bg: #FFFFFF;
    --border: #E5E6EB;
    --shadow: rgba(0,0,0,0.08);
    --shadow-md: rgba(0,0,0,0.12);
    --progress-bg: rgba(22, 93, 255, 0.2);
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }

/* Progress Bar */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    z-index: 9999;
    width: 0;
    transition: width 0.1s ease-out;
}

/* Header */
.header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}
.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    gap: 24px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    color: var(--text);
}
.logo-icon {
    font-size: 28px;
}

/* Navigation */
.nav {
    display: flex;
    gap: 32px;
}
.nav-link {
    color: var(--text-light);
    font-weight: 500;
    position: relative;
    transition: color 0.2s;
}
.nav-link:hover, .nav-link.active {
    color: var(--primary);
}
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
}

/* Search */
.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}
.search-form { flex: 0 0 auto; }
.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}
.search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-light);
    pointer-events: none;
}
.search-input {
    width: 280px;
    padding: 10px 12px 10px 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--progress-bg);
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}
.theme-toggle:hover {
    background: var(--bg);
}
.moon-icon { display: none; }

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 4px;
}
.mobile-menu-btn span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text);
    border-radius: 1px;
    transition: all 0.2s;
}
.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 24px;
    z-index: 99;
}
.mobile-menu-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.mobile-nav-link {
    color: var(--text);
    font-weight: 500;
    padding: 8px 0;
}

/* Hero */
.hero {
    padding: 80px 0 60px;
    background: linear-gradient(135deg, var(--bg) 0%, #E8F4FF 100%);
}
.hero-content { text-align: center; }
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--card-bg);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
    box-shadow: 0 2px 12px var(--shadow);
}
.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}
.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}
.hero-subtitle {
    font-size: 20px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 32px;
}
.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 40px;
}
.stat { text-align: center; }
.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}
.stat-label {
    font-size: 14px;
    color: var(--text-light);
    margin-top: 6px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-weight: 600;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-dark);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(22, 93, 255, 0.3);
}
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: white;
}
.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

/* Symptoms Section */
.symptoms-section {
    padding: 60px 0;
}
.section-header { text-align: center; margin-bottom: 40px; }
.section-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
}
.section-subtitle {
    font-size: 16px;
    color: var(--text-light);
}
.symptoms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}
.symptom-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}
.symptom-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 16px var(--shadow);
    transform: translateY(-2px);
}
.symptom-icon { font-size: 40px; margin-bottom: 12px; }
.symptom-name { font-weight: 600; font-size: 16px; }

/* Main Content Layout */
.main-content { padding: 40px 0 80px; }
.content-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 32px;
}

/* Article Cards */
.articles-grid { display: flex; flex-direction: column; gap: 20px; }
.article-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.2s;
}
.article-card:hover {
    box-shadow: 0 4px 16px var(--shadow);
    border-color: var(--border);
}
.article-card.featured {
    border-color: var(--primary);
}
.article-link {
    display: flex;
    gap: 24px;
    padding: 24px;
}
.article-image {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--progress-bg) 0%, var(--bg) 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.article-content { flex: 1; }
.article-meta-top {
    display: flex;
    gap: 12px;
    margin-bottom: 8px;
}
.article-category {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg);
    color: var(--primary);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}
.article-date {
    color: var(--text-light);
    font-size: 12px;
    line-height: 24px;
}
.article-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}
.article-excerpt {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.read-time {
    color: var(--text-light);
    font-size: 13px;
}
.read-more {
    color: var(--primary);
    font-weight: 600;
    font-size: 13px;
}

/* Sidebar */
.sidebar { display: flex; flex-direction: column; gap: 20px; }
.sidebar-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}
.sidebar-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}
.category-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.category-link {
    display: block;
    padding: 8px 12px;
    color: var(--text);
    border-radius: 6px;
    transition: all 0.2s;
}
.category-link:hover, .category-link.active {
    background: var(--bg);
    color: var(--primary);
}
.popular-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.popular-link {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    color: var(--text);
    transition: color 0.2s;
}
.popular-link:hover {
    color: var(--primary);
}
.popular-text {
    font-size: 14px;
    line-height: 1.4;
}

/* Sidebar CTA */
.cta-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
}
.cta-card .cta-icon { font-size: 36px; margin-bottom: 8px; }
.cta-card .cta-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}
.cta-card .cta-desc {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 16px;
}
.cta-card .btn-primary {
    background: white;
    color: var(--primary);
}
.cta-card .btn-primary:hover {
    background: rgba(255,255,255,0.9);
}

/* Article Page */
.article-main { padding: 40px 0 80px; }
.article-header { margin-bottom: 32px; }
.article-breadcrumbs {
    margin-bottom: 16px;
    color: var(--text-light);
    font-size: 14px;
}
.article-breadcrumbs a { color: var(--text-light); }
.article-breadcrumbs a:hover { color: var(--primary); }
.article-breadcrumbs .separator { margin: 0 8px; }
.article-main .article-title {
    font-size: 36px;
    margin-bottom: 12px;
}
.article-meta {
    display: flex;
    gap: 20px;
    color: var(--text-light);
    font-size: 14px;
}
.article-meta svg { color: var(--text-light); }

.article-body { display: flex; flex-direction: column; gap: 32px; }
.article-content { font-size: 16px; line-height: 1.8; }
.article-content h2 {
    font-size: 24px;
    font-weight: 700;
    margin: 32px 0 16px;
}
.article-content p { margin-bottom: 16px; }
.article-content ul {
    margin: 0 0 16px 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Info & Warning Boxes */
.warning-box, .info-box {
    display: flex;
    gap: 12px;
    padding: 16px;
    border-radius: 10px;
    margin: 20px 0;
}
.warning-box {
    background: #FFF7E6;
    border-left: 4px solid #FF7D00;
}
.info-box {
    background: #E8F4FF;
    border-left: 4px solid var(--primary);
}
.warning-icon, .info-icon { font-size: 24px; flex-shrink: 0; }
.warning-content strong, .info-content strong { display: block; margin-bottom: 4px; }

.toc-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}
.toc-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
}
.toc-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.toc-list a { color: var(--text); }
.toc-list a:hover { color: var(--primary); }

.article-footer {
    padding-top: 24px;
    border-top: 1px solid var(--border);
}
.article-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg);
    color: var(--text-light);
    border-radius: 100px;
    font-size: 13px;
}
.article-feedback {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
}
.article-feedback .feedback-text {
    color: var(--text-light);
    font-weight: 500;
}
.article-feedback .feedback-btn {
    padding: 8px 16px;
    border: 1px solid var(--border);
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}
.article-feedback .feedback-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.related-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.related-link {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    color: var(--text);
    transition: color 0.2s;
}
.related-link:hover { color: var(--primary); }
.related-text {
    font-size: 14px;
    line-height: 1.4;
}

/* Diagnose Page */
.diagnose-main { padding: 40px 0 80px; }
.diagnose-header { text-align: center; margin-bottom: 48px; }
.diagnose-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
}
.diagnose-subtitle {
    font-size: 16px;
    color: var(--text-light);
}
.diagnose-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
    margin-bottom: 48px;
}
.diagnose-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    transition: all 0.2s;
}
.diagnose-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 16px var(--shadow);
}
.diagnose-icon { font-size: 40px; }
.diagnose-content { flex: 1; }
.diagnose-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}
.diagnose-desc {
    font-size: 14px;
    color: var(--text-light);
}
.diagnose-card svg {
    color: var(--primary);
}

.diagnose-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.info-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
}
.info-card .info-icon { font-size: 36px; margin-bottom: 8px; }
.info-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}
.info-card p {
    font-size: 14px;
    color: var(--text-light);
}

/* Diagnose Step */
.diagnose-step-main { padding: 40px 0 80px; }
.diagnose-step-container { max-width: 700px; margin: 0 auto; }
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-light);
    font-weight: 500;
    margin-bottom: 24px;
}
.diagnose-step-header {
    text-align: center;
    margin-bottom: 32px;
}
.diagnose-step-header .step-icon {
    font-size: 48px;
    margin-bottom: 12px;
}
.diagnose-step-header .step-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}
.diagnose-step-header .step-subtitle {
    color: var(--text-light);
    font-size: 16px;
}

.progress-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}
.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}
.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--border);
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}
.progress-step.active .step-number {
    background: var(--primary);
    color: white;
}
.step-label {
    font-size: 12px;
    color: var(--text-light);
}
.progress-line {
    width: 80px;
    height: 2px;
    background: var(--border);
    border-radius: 1px;
}

.diagnose-question {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
}
.question-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}
.question-desc {
    color: var(--text-light);
    margin-bottom: 24px;
}
.question-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.option-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 16px 20px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s;
}
.option-btn:hover {
    border-color: var(--primary);
    background: var(--progress-bg);
}
.option-icon { font-size: 24px; }
.option-text { font-weight: 500; font-size: 15px; }

.diagnose-result {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
}
.result-header { text-align: center; margin-bottom: 24px; }
.result-icon { font-size: 56px; margin-bottom: 8px; }
.result-title {
    font-size: 24px;
    font-weight: 700;
}
.solution-card {
    text-align: center;
}
.solution-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}
.solution-desc {
    color: var(--text-light);
    margin-bottom: 24px;
}
.solution-steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}
.solution-step {
    display: flex;
    gap: 16px;
    text-align: left;
}
.solution-step .step-num {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}
.solution-step h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
}
.solution-step p {
    font-size: 14px;
    color: var(--text-light);
}
.solution-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
}

/* Tools Page */
.tools-main { padding: 40px 0 80px; }
.tools-header { text-align: center; margin-bottom: 48px; }
.tools-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
}
.tools-subtitle {
    font-size: 16px;
    color: var(--text-light);
}
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}
.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
}
.tool-card .tool-icon {
    font-size: 40px;
    margin-bottom: 12px;
}
.tool-card .tool-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}
.tool-card .tool-desc {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 16px;
}
.tool-card .tool-meta {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.tool-card .tool-tag {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg);
    font-size: 12px;
    border-radius: 6px;
    font-weight: 500;
    color: var(--text);
}

/* Search Page */
.search-main { padding: 40px 0 80px; }
.search-header { margin-bottom: 32px; }
.search-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}
.search-subtitle {
    color: var(--text-light);
}
.search-results {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.search-result-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    gap: 16px;
    transition: all 0.2s;
}
.search-result-card:hover {
    box-shadow: 0 4px 16px var(--shadow);
}
.result-icon { font-size: 32px; }
.search-result-card .result-content { flex: 1; }
.search-result-card .result-category {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg);
    color: var(--primary);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 8px;
}
.search-result-card .result-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}
.search-result-card .result-excerpt {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 8px;
}
.search-result-card .result-meta {
    font-size: 13px;
    color: var(--text-light);
}

.no-results {
    text-align: center;
    padding: 60px 24px;
}
.no-results .no-results-icon {
    font-size: 56px;
    margin-bottom: 16px;
}
.no-results h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}
.no-results p {
    color: var(--text-light);
    margin-bottom: 24px;
}

/* About Page */
.about-main { padding: 40px 0 80px; }
.about-content { max-width: 700px; margin: 0 auto; }
.about-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
}
.about-intro {
    color: var(--text-light);
    font-size: 16px;
    margin-bottom: 40px;
}
.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}
.about-stats .stat-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
}
.about-stats .stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
}
.about-stats .stat-label {
    font-size: 14px;
    color: var(--text-light);
}
.about-section { margin-bottom: 32px; }
.about-section h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
}
.about-section p {
    color: var(--text);
    line-height: 1.7;
}
.about-section .feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.about-section .feature-list li {
    font-size: 16px;
}

/* Contact Page */
.contact-main { padding: 40px 0 80px; }
.contact-content { max-width: 500px; margin: 0 auto; }
.contact-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
}
.contact-intro {
    color: var(--text-light);
    font-size: 16px;
    margin-bottom: 32px;
}
.contact-form {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
}
.contact-form .form-group { margin-bottom: 20px; }
.contact-form label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}
.contact-form .form-input,
.contact-form .form-textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.contact-form .form-input:focus,
.contact-form .form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--progress-bg);
}
.contact-form .form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* Privacy & Terms */
.page-main { padding: 40px 0 80px; }
.page-content { max-width: 700px; margin: 0 auto; }
.page-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
}
.page-intro {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 32px;
}
.page-content section {
    margin-bottom: 28px;
}
.page-content h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
}
.page-content p {
    color: var(--text);
    line-height: 1.7;
}

/* 404 Page */
.error-main { padding: 80px 0 120px; }
.error-content { text-align: center; max-width: 500px; margin: 0 auto; }
.error-icon { font-size: 64px; margin-bottom: 16px; }
.error-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
}
.error-desc {
    color: var(--text-light);
    font-size: 16px;
    margin-bottom: 24px;
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 32px;
}
.pagination-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-weight: 500;
    transition: all 0.2s;
}
.pagination-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}
.pagination-info {
    font-size: 14px;
    color: var(--text-light);
}

/* Page Header (Category) */
.page-header {
    margin-bottom: 32px;
}
.page-header .page-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}
.page-header .page-description {
    color: var(--text-light);
    font-size: 15px;
}

/* Footer */
.footer {
    background: var(--text);
    color: white;
    padding: 60px 0 30px;
    margin-top: 40px;
}
.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}
.footer-section ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.footer-section a {
    color: #D1D5DB;
    font-size: 14px;
}
.footer-section a:hover {
    color: white;
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    margin-bottom: 12px;
}
.footer-description {
    color: #D1D5DB;
    font-size: 14px;
    line-height: 1.6;
}
.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid #374151;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}
.copyright {
    color: #9CA3AF;
    font-size: 14px;
}
.footer-badges {
    display: flex;
    gap: 12px;
}
.footer-badges .badge {
    padding: 6px 12px;
    background: rgba(255,255,255,0.08);
    border-radius: 6px;
    font-size: 13px;
    color: #D1D5DB;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.2s;
    box-shadow: 0 4px 12px var(--shadow-md);
    z-index: 999;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 1024px) {
    .content-layout {
        grid-template-columns: 1fr;
    }
    .sidebar {
        order: -1;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    .mobile-menu-btn {
        display: flex;
    }
    .search-input {
        width: 200px;
    }
    .hero-title {
        font-size: 32px;
    }
    .hero-subtitle {
        font-size: 16px;
    }
    .hero-actions {
        flex-direction: column;
    }
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }
    .article-link {
        flex-direction: column;
    }
    .article-image {
        width: 100%;
        height: 160px;
    }
    .footer-content {
        grid-template-columns: 1fr;
    }
    .footer-bottom {
        flex-direction: column;
    }
    .about-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .search-input {
        width: 140px;
    }
}

/* Dark Mode (Ready for JS toggle) */
body.dark-mode {
    --text: #F5F7FA;
    --text-light: #9CA3AF;
    --bg: #0F172A;
    --card-bg: #1E293B;
    --border: #334155;
    --shadow: rgba(0,0,0,0.3);
    --shadow-md: rgba(0,0,0,0.4);
}
body.dark-mode .sun-icon { display: none; }
body.dark-mode .moon-icon { display: block; }