/* ============================================
   Web3Zhuan - Styles
   ============================================ */

/* Variables */
:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a2035;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent-primary: #f59e0b;
    --accent-secondary: #fbbf24;
    --accent-red: #ef4444;
    --accent-green: #10b981;
    --border-color: #1f2937;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
}

/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
}

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

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 14, 23, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-accent {
    color: var(--accent-primary);
}

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

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.subscribe-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--accent-red);
    color: white;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.2s;
}

.subscribe-btn:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.youtube-icon {
    width: 20px;
    height: 20px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 0 60px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(245, 158, 11, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
        linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 20px;
    color: var(--accent-primary);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

.title-line {
    display: block;
    color: var(--text-primary);
}

.title-accent {
    display: block;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 48px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.btn svg {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(245, 158, 11, 0.3);
}

.btn-youtube {
    background: var(--accent-red);
    color: white;
}

.btn-youtube:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
}

.stat {
    text-align: center;
}

.stat-num {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

/* ============================================
   Categories
   ============================================ */
.categories {
    padding: 40px 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.category-tabs {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.tab {
    padding: 10px 24px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.tab.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
}

/* ============================================
   Articles
   ============================================ */
.articles {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--text-secondary);
}

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

.article-card {
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.article-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow);
}

.card-video {
    position: relative;
    padding-top: 56.25%; /* 16:9 */
    background: var(--bg-secondary);
}

.card-video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    padding: 4px 8px;
    background: rgba(0, 0, 0, 0.8);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.card-content {
    padding: 20px;
}

.card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.card-tag {
    padding: 4px 10px;
    background: rgba(245, 158, 11, 0.1);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-primary);
}

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

.card-title {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 12px;
}

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

.card-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.card-read {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
}

.card-read:hover {
    text-decoration: underline;
}

.card-subscribe {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--accent-red);
}

.load-more {
    text-align: center;
    margin-top: 48px;
}

/* ============================================
   Subscribe Section
   ============================================ */
.subscribe-section {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.subscribe-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(16, 185, 129, 0.1));
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: 24px;
    padding: 48px;
}

.subscribe-content {
    flex: 1;
}

.subscribe-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
}

.subscribe-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.btn-subscribe {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: var(--accent-red);
    color: white;
    font-size: 18px;
    font-weight: 700;
    border-radius: 12px;
    transition: all 0.2s;
}

.btn-subscribe:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

.btn-subscribe svg {
    width: 24px;
    height: 24px;
}

.subscribe-qr {
    text-align: center;
    margin-left: 48px;
}

.subscribe-qr img {
    width: 120px;
    height: 120px;
    background: white;
    border-radius: 12px;
    padding: 8px;
}

.subscribe-qr p {
    margin-top: 12px;
    font-size: 14px;
    color: var(--text-muted);
}

/* ============================================
   About
   ============================================ */
.about {
    padding: 80px 0;
}

.about-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.about-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 24px;
}

.about-text {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-links {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-top: 32px;
}

.about-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s;
}

.about-link:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 40px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-logo .logo-text {
    font-size: 18px;
}

.footer-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 8px;
}

.footer-links {
    display: flex;
    gap: 24px;
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 14px;
}

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

.footer-copy {
    font-size: 13px;
    color: var(--text-muted);
}

.friend-links {
    background: rgba(0, 0, 0, 0.3);
    padding: 12px 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.friend-links .container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.friend-links-title {
    color: var(--text-muted);
    font-size: 13px;
}

.friend-links a {
    color: var(--text-secondary);
    font-size: 13px;
    text-decoration: none;
    transition: color 0.3s;
}

.friend-links a:hover {
    color: var(--accent-primary);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }
    
    .hero-desc {
        font-size: 16px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }
    
    .nav {
        display: none;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .subscribe-box {
        flex-direction: column;
        text-align: center;
        padding: 32px;
    }
    
    .subscribe-qr {
        margin-left: 0;
        margin-top: 24px;
    }
    
    .footer-inner {
        flex-direction: column;
        text-align: center;
        gap: 24px;
    }
    
    .footer-links {
        justify-content: center;
    }
}