/* ============================================
   色虎 - 原创样式表
   品牌：色虎 | 域名：zeinie.cn
   配色：深蓝紫 + 活力橙 + 科技绿
   ============================================ */

/* CSS Variables */
:root {
    --primary: #1A1F3D;
    --primary-light: #252B4D;
    --secondary: #FF6B35;
    --accent: #00D4AA;
    --bg-dark: #0D1117;
    --bg-card: #161B2E;
    --bg-card-hover: #1E2440;
    --text-main: #E8ECF1;
    --text-muted: #8B95A5;
    --text-dark: #C0C8D4;
    --border-color: #2A3050;
    --gradient-primary: linear-gradient(135deg, #1A1F3D 0%, #0D1117 100%);
    --gradient-accent: linear-gradient(135deg, #FF6B35 0%, #FF8F65 100%);
    --gradient-tech: linear-gradient(135deg, #00D4AA 0%, #00B894 100%);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 40px rgba(255, 107, 53, 0.15);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: var(--secondary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent);
}

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

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

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-main);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--gradient-accent);
    margin: 12px auto 0;
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 3rem;
}

.section-padding {
    padding: 80px 0;
}

/* ============ Header & Navigation ============ */
.site-header {
    background: rgba(13, 17, 23, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    max-width: 1200px;
    margin: 0 auto;
    height: 70px;
}

.logo-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-wrap img {
    height: 42px;
    width: auto;
}

.logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: 1px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.main-nav a {
    color: var(--text-dark);
    font-size: 0.9rem;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--secondary);
    background: rgba(255, 107, 53, 0.1);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-main);
    transition: var(--transition);
    border-radius: 1px;
}

/* ============ Search Bar ============ */
.search-bar-wrap {
    background: var(--primary);
    padding: 12px 0;
    margin-top: 70px;
    border-bottom: 1px solid var(--border-color);
}

.search-bar {
    display: flex;
    max-width: 680px;
    margin: 0 auto;
    position: relative;
}

.search-bar input {
    flex: 1;
    padding: 12px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-right: none;
    border-radius: var(--radius) 0 0 var(--radius);
    color: var(--text-main);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.search-bar input:focus {
    border-color: var(--secondary);
}

.search-bar input::placeholder {
    color: var(--text-muted);
}

.search-bar button {
    padding: 12px 28px;
    background: var(--gradient-accent);
    border: none;
    border-radius: 0 var(--radius) var(--radius) 0;
    color: #fff;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.search-bar button:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* ============ Hero Section ============ */
.hero-section {
    position: relative;
    height: 520px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.4);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.hero-content h1 .brand-highlight {
    color: var(--secondary);
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-dark);
    max-width: 600px;
    margin: 0 auto 30px;
    text-shadow: 0 1px 10px rgba(0,0,0,0.5);
}

.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--gradient-accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.3);
    color: #fff;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: transparent;
    color: var(--text-main);
    border: 2px solid var(--text-muted);
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

/* ============ Video Cards Grid ============ */
.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.video-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
}

.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--secondary);
}

.video-thumb {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/9;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.video-card:hover .video-thumb img {
    transform: scale(1.05);
}

.play-btn-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: var(--transition);
}

.video-card:hover .play-btn-overlay {
    opacity: 1;
}

.play-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 107, 53, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.play-icon::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: 4px;
}

.play-icon:hover {
    transform: scale(1.1);
    background: rgba(255, 107, 53, 1);
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
}

.video-info {
    padding: 16px;
}

.video-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-main);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.video-tags {
    display: flex;
    gap: 6px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.video-tag {
    padding: 3px 10px;
    background: rgba(255, 107, 53, 0.1);
    color: var(--secondary);
    border-radius: 20px;
    font-size: 0.75rem;
    border: 1px solid rgba(255, 107, 53, 0.2);
}

/* ============ Category Tabs ============ */
.category-tabs {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.category-tab {
    padding: 8px 24px;
    background: var(--bg-card);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.category-tab:hover,
.category-tab.active {
    background: var(--gradient-accent);
    color: #fff;
    border-color: var(--secondary);
}

/* ============ Expert Section ============ */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.expert-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.expert-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--secondary);
}

.expert-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 16px;
    border: 3px solid var(--secondary);
}

.expert-card h4 {
    font-size: 1.1rem;
    color: var(--text-main);
    margin-bottom: 6px;
}

.expert-role {
    color: var(--secondary);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.expert-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.expert-btns {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.btn-sm {
    padding: 6px 16px;
    font-size: 0.8rem;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-sm-primary {
    background: var(--gradient-accent);
    color: #fff;
    border: none;
}

.btn-sm-outline {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}

/* ============ Partner Logo Wall ============ */
.partner-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
    padding: 40px 0;
}

.partner-logo {
    background: var(--bg-card);
    padding: 20px 30px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 600;
    transition: var(--transition);
}

.partner-logo:hover {
    border-color: var(--secondary);
    color: var(--text-main);
}

/* ============ FAQ Section ============ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--secondary);
}

.faq-question {
    padding: 18px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-main);
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--secondary);
}

.faq-arrow {
    transition: var(--transition);
    font-size: 1.2rem;
    color: var(--secondary);
}

.faq-item.active .faq-arrow {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer-inner {
    padding: 0 24px 18px;
    color: var(--text-muted);
    line-height: 1.8;
}

/* ============ Reviews Section ============ */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.review-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.review-card:hover {
    border-color: var(--accent);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.review-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
}

.review-name {
    font-weight: 600;
    color: var(--text-main);
}

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

.review-stars {
    color: #FFD700;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.review-text {
    color: var(--text-dark);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ============ How-To Section ============ */
.howto-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.howto-step {
    text-align: center;
    padding: 30px 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.howto-step:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.step-num {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    margin: 0 auto 16px;
}

.howto-step h4 {
    color: var(--text-main);
    margin-bottom: 8px;
}

.howto-step p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============ Contact Section ============ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.contact-info-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 30px;
    border: 1px solid var(--border-color);
}

.contact-info-card h3 {
    color: var(--secondary);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.contact-icon {
    color: var(--accent);
    font-size: 1.1rem;
    min-width: 24px;
}

.qrcode-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.qrcode-item {
    text-align: center;
}

.qrcode-item img {
    width: 160px;
    height: 160px;
    margin: 0 auto 8px;
    border-radius: var(--radius-sm);
}

.qrcode-item p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ============ Share Buttons ============ */
.share-btns {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 20px;
}

.share-btn {
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    color: #fff;
    font-weight: 500;
}

.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #161823; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; }

.share-btn:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

/* ============ Footer ============ */
.site-footer {
    background: var(--primary);
    border-top: 1px solid var(--border-color);
    padding: 50px 0 20px;
}

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

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-top: 12px;
}

.footer-col h4 {
    color: var(--text-main);
    margin-bottom: 16px;
    font-size: 1rem;
}

.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(--secondary);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ============ Breadcrumb ============ */
.breadcrumb {
    padding: 16px 0;
    margin-top: 70px;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.breadcrumb-list a {
    color: var(--text-muted);
}

.breadcrumb-list a:hover {
    color: var(--secondary);
}

.breadcrumb-sep {
    color: var(--text-muted);
}

/* ============ Inner Page Content ============ */
.page-header {
    background: var(--primary);
    padding: 60px 0 40px;
    text-align: center;
    margin-top: 70px;
}

.page-header h1 {
    font-size: 2.2rem;
    color: var(--text-main);
    margin-bottom: 12px;
}

.page-header p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

.content-section {
    padding: 60px 0;
}

.content-article {
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.9;
    color: var(--text-dark);
}

.content-article h2 {
    color: var(--text-main);
    font-size: 1.5rem;
    margin: 40px 0 16px;
    padding-left: 12px;
    border-left: 4px solid var(--secondary);
}

.content-article h3 {
    color: var(--text-main);
    font-size: 1.2rem;
    margin: 30px 0 12px;
}

.content-article p {
    margin-bottom: 16px;
}

/* ============ Feature Grid ============ */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-card h4 {
    color: var(--text-main);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============ Stats Bar ============ */
.stats-bar {
    background: var(--primary-light);
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}

.stat-item h3 {
    font-size: 2.2rem;
    color: var(--secondary);
    font-weight: 800;
}

.stat-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* ============ Lazy Load ============ */
.lazy-img {
    opacity: 0;
    transition: opacity 0.5s ease;
}

.lazy-img.loaded {
    opacity: 1;
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .expert-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .howto-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(13, 17, 23, 0.98);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
    }

    .main-nav.show {
        display: flex;
    }

    .mobile-toggle {
        display: flex;
    }

    .hero-section {
        height: 400px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

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

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

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

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

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

    .howto-steps {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-title {
        font-size: 1.5rem;
    }

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

    .hero-btns {
        flex-direction: column;
        align-items: center;
    }

    .page-header {
        padding: 40px 0 30px;
    }

    .page-header h1 {
        font-size: 1.6rem;
    }
}

@media (max-width: 480px) {
    .header-inner {
        padding: 0 12px;
    }

    .logo-text {
        font-size: 1.1rem;
    }

    .container {
        padding: 0 12px;
    }

    .section-padding {
        padding: 50px 0;
    }
}

/* ============ Animations ============ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

/* ============ JSON-LD Hidden ============ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}