/* ============================================
   里番网 - 全站样式表
   品牌色系：深邃夜蓝 + 活力橙 + 科技青绿
   ============================================ */

/* CSS Variables */
:root {
    --primary: #1A1E2E;
    --accent: #FF6B35;
    --teal: #00D4AA;
    --bg-dark: #0D1117;
    --card-bg: #161B22;
    --text-light: #E6EDF3;
    --text-muted: #8B949E;
    --border-color: #21262D;
    --gradient-accent: linear-gradient(135deg, #FF6B35, #FF8F65);
    --gradient-teal: linear-gradient(135deg, #00D4AA, #00F5C8);
    --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-hover: 0 8px 32px rgba(255,107,53,0.2);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--teal); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; }

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section-padding { padding: 60px 0; }

/* ============================================
   Header & Navigation
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(13,17,23,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    max-width: 1200px;
    margin: 0 auto;
}
.site-logo { display: flex; align-items: center; gap: 10px; }
.site-logo img { height: 42px; width: auto; }
.site-logo span { font-size: 1.3rem; font-weight: 700; color: var(--accent); }

/* Navigation */
.main-nav { display: flex; align-items: center; gap: 0; }
.main-nav a {
    color: var(--text-light);
    padding: 8px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
    color: var(--accent);
    background: rgba(255,107,53,0.1);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}
.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-light);
    transition: var(--transition);
}

/* Search Bar */
.search-bar {
    background: var(--primary);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
    margin-top: 66px;
}
.search-bar .container { display: flex; justify-content: center; }
.search-input-wrap {
    display: flex;
    max-width: 600px;
    width: 100%;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    overflow: hidden;
    transition: var(--transition);
}
.search-input-wrap:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(255,107,53,0.15); }
.search-input-wrap input {
    flex: 1;
    padding: 10px 20px;
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 0.95rem;
    outline: none;
}
.search-input-wrap input::placeholder { color: var(--text-muted); }
.search-input-wrap button {
    padding: 10px 24px;
    background: var(--gradient-accent);
    border: none;
    color: #fff;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
}
.search-input-wrap button:hover { opacity: 0.85; }

/* Breadcrumb */
.breadcrumb {
    padding: 15px 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 6px; }

/* ============================================
   Banner / Hero Section
   ============================================ */
.hero-banner {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 0;
}
.hero-banner .hero-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    object-fit: cover;
    filter: brightness(0.5);
}
.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 40px 20px;
    max-width: 800px;
}
.hero-content h1 {
    font-size: 2.8rem;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--accent), var(--teal));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-content p {
    font-size: 1.15rem;
    color: rgba(230,237,243,0.85);
    margin-bottom: 24px;
    line-height: 1.8;
}
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.hero-tags span {
    padding: 6px 16px;
    background: rgba(255,107,53,0.15);
    border: 1px solid rgba(255,107,53,0.3);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--accent);
}

/* ============================================
   Section Titles
   ============================================ */
.section-title {
    text-align: center;
    margin-bottom: 40px;
}
.section-title h2 {
    font-size: 2rem;
    margin-bottom: 12px;
    color: var(--text-light);
}
.section-title h2 em {
    font-style: normal;
    color: var(--accent);
}
.section-title p {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}
.title-line {
    width: 60px;
    height: 3px;
    background: var(--gradient-accent);
    margin: 12px auto 0;
    border-radius: 2px;
}

/* ============================================
   Video Card Grid
   ============================================ */
.video-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.video-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
}
.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(255,107,53,0.3);
}
.video-thumb {
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
}
.video-thumb img {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.play-btn {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 56px; height: 56px;
    background: rgba(255,107,53,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    z-index: 3;
}
.play-btn::after {
    content: '';
    display: block;
    width: 0; height: 0;
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent #fff;
    margin-left: 3px;
}
.video-card:hover .play-btn { opacity: 1; }
.video-duration {
    position: absolute;
    bottom: 8px; right: 8px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}
.video-info { padding: 14px; }
.video-info h3 {
    font-size: 0.95rem;
    margin-bottom: 8px;
    color: var(--text-light);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-meta {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tag {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(0,212,170,0.1);
    color: var(--teal);
    border-radius: 4px;
    font-size: 0.75rem;
    margin-top: 8px;
}

/* ============================================
   Module Cards (游戏传媒、AI赋能等)
   ============================================ */
.module-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.module-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
    text-align: center;
}
.module-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.module-icon {
    width: 56px; height: 56px;
    margin: 0 auto 16px;
    background: var(--gradient-accent);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}
.module-icon.teal { background: var(--gradient-teal); }
.module-card h3 { font-size: 1.1rem; margin-bottom: 10px; color: var(--text-light); }
.module-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

/* ============================================
   Expert Cards
   ============================================ */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.expert-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}
.expert-card:hover {
    border-color: var(--teal);
    transform: translateY(-4px);
}
.expert-avatar {
    width: 100px; height: 100px;
    border-radius: 50%;
    margin: 0 auto 16px;
    overflow: hidden;
    border: 3px solid var(--accent);
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-card h4 { font-size: 1.05rem; margin-bottom: 4px; color: var(--text-light); }
.expert-card .role { color: var(--accent); font-size: 0.85rem; margin-bottom: 10px; }
.expert-card p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 14px; }
.expert-links { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.btn-sm {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    border: 1px solid var(--accent);
    color: var(--accent);
    transition: var(--transition);
    cursor: pointer;
    background: transparent;
}
.btn-sm:hover { background: var(--accent); color: #fff; }
.btn-sm.teal { border-color: var(--teal); color: var(--teal); }
.btn-sm.teal:hover { background: var(--teal); color: var(--bg-dark); }

/* ============================================
   FAQ Section
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
}
.faq-question {
    padding: 18px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-light);
    transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-question .arrow {
    transition: transform 0.3s ease;
    font-size: 1.2rem;
    color: var(--accent);
}
.faq-item.active .faq-question .arrow { transform: rotate(180deg); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}
.faq-answer-inner {
    padding: 0 24px 18px;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* ============================================
   Reviews / Testimonials
   ============================================ */
.review-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.review-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}
.review-card:hover { border-color: rgba(0,212,170,0.3); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar {
    width: 44px; height: 44px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
}
.review-name { font-weight: 600; color: var(--text-light); font-size: 0.95rem; }
.review-date { font-size: 0.8rem; color: var(--text-muted); }
.review-stars { color: #FFB800; font-size: 0.9rem; margin-bottom: 10px; }
.review-text { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }

/* ============================================
   Contact & QR Codes
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
}
.contact-card h4 { color: var(--accent); margin-bottom: 12px; font-size: 1.1rem; }
.contact-card p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 6px; }
.qr-img { width: 160px; height: 160px; margin: 12px auto; border-radius: var(--radius-sm); overflow: hidden; }
.qr-img img { width: 100%; height: 100%; object-fit: cover; }

/* ============================================
   Community Grid
   ============================================ */
.community-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.community-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}
.community-card:hover {
    border-color: var(--teal);
    transform: translateY(-4px);
}
.community-emoji { font-size: 2.5rem; margin-bottom: 12px; }
.community-card h4 { font-size: 1rem; margin-bottom: 8px; color: var(--text-light); }
.community-card p { font-size: 0.85rem; color: var(--text-muted); }

/* ============================================
   How-To Guide
   ============================================ */
.howto-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 30px;
}
.howto-step {
    text-align: center;
    position: relative;
}
.step-number {
    width: 48px; height: 48px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
}
.howto-step h4 { font-size: 1rem; margin-bottom: 8px; color: var(--text-light); }
.howto-step p { font-size: 0.85rem; color: var(--text-muted); }

/* ============================================
   Share Buttons
   ============================================ */
.share-bar {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    padding: 20px 0;
}
.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
    color: var(--text-light);
    background: var(--card-bg);
    cursor: pointer;
    transition: var(--transition);
}
.share-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: var(--primary);
    border-top: 1px solid var(--border-color);
    padding: 40px 0 20px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}
.footer-brand .site-logo { margin-bottom: 14px; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }
.footer-col h5 {
    color: var(--accent);
    font-size: 1rem;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
}
.footer-col a {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 4px 0;
    transition: var(--transition);
}
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}
.footer-qr-row {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin: 20px 0;
}
.footer-qr-item { text-align: center; }
.footer-qr-item img { width: 120px; height: 120px; border-radius: var(--radius-sm); margin-bottom: 6px; }
.footer-qr-item span { font-size: 0.8rem; color: var(--text-muted); }

/* ============================================
   Buttons
   ============================================ */
.btn-primary {
    display: inline-block;
    padding: 12px 28px;
    background: var(--gradient-accent);
    color: #fff;
    border-radius: 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,107,53,0.35); color: #fff; }
.btn-outline {
    display: inline-block;
    padding: 10px 24px;
    border: 2px solid var(--accent);
    color: var(--accent);
    border-radius: 24px;
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
}
.btn-outline:hover { background: var(--accent); color: #fff; }

/* ============================================
   Partner Logo Wall
   ============================================ */
.partner-wall {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: center;
}
.partner-item {
    width: 140px;
    height: 70px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: var(--transition);
}
.partner-item:hover { border-color: var(--accent); color: var(--accent); }

/* ============================================
   Inner Page Styles
   ============================================ */
.page-header {
    padding: 100px 0 40px;
    text-align: center;
    background: linear-gradient(180deg, var(--primary), var(--bg-dark));
}
.page-header h1 { font-size: 2.2rem; margin-bottom: 12px; color: var(--text-light); }
.page-header p { color: var(--text-muted); font-size: 1rem; }

.content-block {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 30px;
    margin-bottom: 24px;
}
.content-block h2 { font-size: 1.5rem; margin-bottom: 16px; color: var(--accent); }
.content-block h3 { font-size: 1.2rem; margin-bottom: 12px; color: var(--text-light); }
.content-block p { color: var(--text-muted); margin-bottom: 12px; line-height: 1.8; }

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .video-grid { grid-template-columns: repeat(3, 1fr); }
    .expert-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .howto-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 66px;
        left: 0;
        width: 100%;
        background: rgba(13,17,23,0.98);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
    }
    .main-nav.active { display: flex; }
    .menu-toggle { display: flex; }
    .video-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .module-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .community-grid { grid-template-columns: repeat(2, 1fr); }
    .review-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .hero-content h1 { font-size: 1.8rem; }
    .hero-banner { min-height: 380px; }
    .section-title h2 { font-size: 1.5rem; }
    .expert-grid { grid-template-columns: 1fr; }
    .howto-steps { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .video-grid { grid-template-columns: 1fr; }
    .community-grid { grid-template-columns: 1fr; }
    .hero-content h1 { font-size: 1.5rem; }
}

/* ============================================
   Lazy Loading & Animation
   ============================================ */
.lazy-img {
    opacity: 0;
    transition: opacity 0.5s ease;
}
.lazy-img.loaded { opacity: 1; }

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease forwards; }

/* ============================================
   MCP Service Frontend (Decorative)
   ============================================ */
.mcp-widget {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin-top: 20px;
    text-align: center;
}
.mcp-widget .mcp-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--teal);
}
.mcp-widget .mcp-dot {
    width: 8px; height: 8px;
    background: var(--teal);
    border-radius: 50%;
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}