/* ===================================================================
   吹雪云官网 - 浅色系现代化旗舰视觉样式表 (Light Aesthetic Theme)
   =================================================================== */

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-glow: rgba(37, 99, 235, 0.15);
    
    --accent: #0ea5e9;
    --accent-indigo: #6366f1;
    --accent-emerald: #10b981;
    
    --bg-page: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-glass: rgba(255, 255, 255, 0.82);
    --bg-surface-elevated: #ffffff;
    --bg-subtle: #f1f5f9;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    
    --border-light: rgba(226, 232, 240, 0.85);
    --border-hover: rgba(148, 163, 184, 0.4);
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
    --shadow-lg: 0 12px 36px -4px rgba(37, 99, 235, 0.1), 0 4px 12px -2px rgba(15, 23, 42, 0.04);
    --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.25);
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Global Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

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

body {
    background-color: var(--bg-page);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.65;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* Dynamic Ambient Background Canvas & Glows */
#snow-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.ambient-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
    opacity: 0.55;
    animation: floatGlow 14s infinite ease-in-out alternate;
}

.glow-1 {
    top: -100px;
    left: 15%;
    width: 550px;
    height: 550px;
    background: radial-gradient(circle, rgba(186, 230, 253, 0.55), rgba(219, 234, 254, 0));
}

.glow-2 {
    top: 35%;
    right: -120px;
    width: 650px;
    height: 650px;
    background: radial-gradient(circle, rgba(199, 210, 254, 0.45), rgba(224, 231, 255, 0));
    animation-delay: -5s;
}

.glow-3 {
    bottom: -150px;
    left: 20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(167, 243, 208, 0.35), rgba(209, 250, 229, 0));
    animation-delay: -9s;
}

@keyframes floatGlow {
    0% { transform: translateY(0) scale(1); }
    50% { transform: translateY(40px) scale(1.08); }
    100% { transform: translateY(-30px) scale(0.95); }
}

/* Base Layout Container */
.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 2;
}

/* Typography Helpers */
.gradient-text {
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 40%, #0284c7 80%, #6366f1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--radius-full);
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 56px;
}

.section-title {
    font-size: 2.35rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.25;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Navigation Bar */
.navbar {
    position: sticky;
    top: 16px;
    z-index: 100;
    margin: 0 auto;
    padding: 0 24px;
}

.navbar-inner {
    background: var(--bg-surface-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    padding: 10px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 800;
    font-size: 1.25rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #2563eb, #38bdf8);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 8px;
}

.nav-item a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.93rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.nav-item a:hover {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.08);
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white !important;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 10px 22px;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    transition: var(--transition);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
    transform: translateY(-1px);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: white;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 10px 22px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--text-primary);
}

/* Hero Section */
.hero-section {
    padding: 70px 0 90px;
    text-align: center;
    position: relative;
}

.hero-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(191, 219, 254, 0.8);
    padding: 6px 18px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    color: #1e40af;
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
}

.hero-pill-badge {
    background: #2563eb;
    color: white;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
}

.hero-title {
    font-size: 3.4rem;
    font-weight: 850;
    line-height: 1.18;
    letter-spacing: -0.035em;
    margin-bottom: 24px;
    max-width: 980px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 780px;
    margin: 0 auto 36px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 50px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 960px;
    margin: 0 auto;
    background: var(--bg-surface-glass);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-md);
}

.stat-item {
    text-align: center;
    border-right: 1px solid var(--border-light);
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    font-size: 2.1rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Feature Cards (核心优势) */
.section-features {
    padding: 90px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-surface-glass);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #3b82f6, #06b6d4);
    opacity: 0;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(147, 197, 253, 0.6);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon-wrapper {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(14, 165, 233, 0.1));
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* Node Latency & Status (节点延迟与状态) */
.section-nodes {
    padding: 90px 0;
    background: linear-gradient(180deg, rgba(241, 245, 249, 0.5) 0%, rgba(248, 250, 252, 0) 100%);
}

.node-container {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
}

.node-control-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.node-tabs {
    display: flex;
    gap: 8px;
    background: var(--bg-subtle);
    padding: 4px;
    border-radius: var(--radius-full);
}

.node-tab {
    border: none;
    background: transparent;
    padding: 8px 18px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.node-tab.active {
    background: white;
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.node-refresh-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    color: var(--primary);
    background: var(--primary-light);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--radius-full);
    padding: 8px 16px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.node-refresh-btn:hover {
    background: #dbeafe;
}

.node-table-wrapper {
    overflow-x: auto;
}

.node-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.node-table th {
    text-align: left;
    padding: 14px 18px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-light);
    font-weight: 600;
}

.node-table td {
    padding: 18px;
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    font-size: 0.95rem;
}

.node-table tr:last-child td {
    border-bottom: none;
}

.node-table tr:hover td {
    background: rgba(241, 245, 249, 0.5);
}

.node-name-col {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    color: var(--text-primary);
}

.flag-icon {
    font-size: 1.3rem;
}

.ping-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-full);
}

.ping-badge.fast {
    background: #ecfdf5;
    color: #059669;
}

.ping-badge.medium {
    background: #fefce8;
    color: #ca8a04;
}

.status-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 8px #10b981;
    animation: blink 2s infinite ease-in-out;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.load-bar-wrapper {
    width: 110px;
    height: 8px;
    background: #e2e8f0;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.load-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg, #10b981, #06b6d4);
}

/* Pricing Section (套餐价格板块) */
.section-pricing {
    padding: 90px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    align-items: stretch;
}

.pricing-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(96, 165, 250, 0.7);
}

.pricing-card.featured {
    border: 2px solid var(--primary);
    box-shadow: 0 12px 35px -5px rgba(37, 99, 235, 0.18);
    background: linear-gradient(180deg, #ffffff 0%, #f0f7ff 100%);
    transform: scale(1.02);
}

.pricing-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #2563eb, #38bdf8);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.pricing-plan-name {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.pricing-plan-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    min-height: 42px;
    margin-bottom: 20px;
}

.pricing-price-box {
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-light);
}

.pricing-currency {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.pricing-amount {
    font-size: 2.75rem;
    font-weight: 850;
    color: var(--text-primary);
    line-height: 1;
}

.pricing-period {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.pricing-features-list {
    list-style: none;
    margin-bottom: 32px;
    flex-grow: 1;
}

.pricing-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 14px;
}

.check-icon {
    width: 18px;
    height: 18px;
    color: #10b981;
    flex-shrink: 0;
    margin-top: 3px;
}

/* Knowledge Base & Tutorials (知识库与教程板块) */
.section-knowledge {
    padding: 90px 0;
    background: linear-gradient(180deg, rgba(248, 250, 252, 0) 0%, rgba(238, 242, 255, 0.4) 100%);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
}

.article-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 26px 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.4);
}

.article-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.article-tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    background: #eff6ff;
    color: #2563eb;
}

.article-time {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.article-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.45;
    margin-bottom: 12px;
}

.article-title a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

.article-title a:hover {
    color: var(--primary);
}

.article-excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-readmore {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.article-readmore:hover {
    gap: 8px;
    color: var(--primary-hover);
}

/* User Reviews (用户评价板块) */
.section-reviews {
    padding: 90px 0;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.review-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stars-row {
    color: #f59e0b;
    display: flex;
    gap: 4px;
    margin-bottom: 14px;
    font-size: 1rem;
}

.review-content {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    font-style: italic;
}

.review-user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    border-top: 1px solid rgba(226, 232, 240, 0.6);
    padding-top: 16px;
}

.user-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, #dbeafe, #e0e7ff);
    color: #2563eb;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.user-details h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.user-details p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* FAQ Accordion (常见问题板块) */
.section-faq {
    padding: 90px 0;
    background: linear-gradient(180deg, rgba(248, 250, 252, 0) 0%, rgba(241, 245, 249, 0.6) 100%);
}

.faq-wrapper {
    max-width: 820px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    margin-bottom: 14px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(148, 163, 184, 0.5);
}

.faq-question {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-primary);
    user-select: none;
}

.faq-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
    color: var(--text-secondary);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 24px 22px;
}

/* Footer */
.footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 70px 0 35px;
    position: relative;
    z-index: 10;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 50px;
}

.footer-brand h3 {
    color: white;
    font-size: 1.3rem;
    margin-bottom: 14px;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 320px;
}

.footer-col h4 {
    color: white;
    font-size: 1rem;
    margin-bottom: 18px;
    font-weight: 600;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(148, 163, 184, 0.15);
    padding-top: 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
}

.footer-bottom-links a {
    color: #94a3b8;
    text-decoration: none;
}

.footer-bottom-links a:hover {
    color: #38bdf8;
}

/* Floating Action Button */
.back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 44px;
    height: 44px;
    background: white;
    color: var(--primary);
    border: 1px solid var(--border-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    z-index: 99;
}

.back-to-top.show {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

/* Article Single Page Specific Styling */
.article-header-banner {
    padding: 60px 0 40px;
    background: linear-gradient(180deg, rgba(239, 246, 255, 0.7) 0%, rgba(248, 250, 252, 0) 100%);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

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

.article-main-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 40px;
    padding: 40px 0 80px;
}

.article-sidebar {
    position: sticky;
    top: 90px;
    height: fit-content;
}

.article-toc-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.article-toc-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-light);
}

.article-toc-list {
    list-style: none;
}

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

.article-toc-list a {
    font-size: 0.88rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    display: block;
    line-height: 1.4;
}

.article-toc-list a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.article-content {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-sm);
}

.article-content h1 {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.article-content h2 {
    font-size: 1.55rem;
    font-weight: 700;
    margin: 40px 0 18px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
}

.article-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 28px 0 14px;
    color: var(--text-primary);
}

.article-content p {
    font-size: 1.02rem;
    line-height: 1.85;
    color: #334155;
    margin-bottom: 20px;
}

.article-content ul, .article-content ol {
    margin-bottom: 24px;
    padding-left: 24px;
    color: #334155;
}

.article-content li {
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 8px;
}

.article-content blockquote {
    background: #f0f7ff;
    border-left: 4px solid var(--primary);
    padding: 16px 20px;
    border-radius: 0 10px 10px 0;
    margin: 24px 0;
    font-size: 0.98rem;
    color: #1e3a8a;
}

.article-cta-box {
    background: linear-gradient(135deg, #eff6ff 0%, #e0e7ff 100%);
    border: 1px solid #bfdbfe;
    border-radius: var(--radius-md);
    padding: 30px;
    text-align: center;
    margin: 40px 0 20px;
}

.article-related-box {
    margin-top: 50px;
    padding-top: 35px;
    border-top: 1px solid var(--border-light);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
    .hero-title { font-size: 2.75rem; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    .articles-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-grid { grid-template-columns: repeat(2, 1fr); }
    .article-main-layout { grid-template-columns: 1fr; }
    .article-sidebar { display: none; }
    .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 65px;
        left: 20px;
        right: 20px;
        background: white;
        padding: 20px;
        border-radius: 16px;
        box-shadow: var(--shadow-lg);
        border: 1px solid var(--border-light);
    }
    .mobile-menu-btn { display: block; }
    .hero-title { font-size: 2.15rem; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .stat-item { border-right: none; }
    .features-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .articles-grid { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; }
    .article-content { padding: 24px; }
}