/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #00d4ff;
    --primary-dark: #0099cc;
    --primary-light: #33e0ff;
    --secondary: #0066ff;
    --accent: #00a8ff;
    --bg-dark: #0a0e27;
    --bg-darker: #050812;
    --bg-card: #141b2d;
    --bg-hover: #1e2a3f;
    --text-primary: #ffffff;
    --text-secondary: #b8c5d6;
    --text-muted: #7a8ba3;
    --border-color: #1e2a3f;
    --shadow-sm: 0 2px 12px rgba(0, 212, 255, 0.1);
    --shadow-md: 0 4px 24px rgba(0, 212, 255, 0.15);
    --shadow-lg: 0 8px 48px rgba(0, 212, 255, 0.2);
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #0066ff 100%);
    --gradient-hero: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, rgba(0, 102, 255, 0.1) 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 顶部导航栏 - 全新风格 */
.main-header {
    background: rgba(20, 27, 45, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-wrapper {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.header-brand {
    display: flex;
    align-items: center;
}

.brand-logo {
    font-size: 32px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 1px;
}

.header-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    padding: 12px 24px;
    border-radius: 8px;
    transition: all 0.3s;
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s;
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(0, 212, 255, 0.1);
}

.nav-link:hover::before {
    width: 60%;
}

.nav-link.active {
    color: var(--primary);
    background: rgba(0, 212, 255, 0.15);
}

.nav-link.active::before {
    width: 60%;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    width: 28px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
    transition: all 0.3s;
}

/* 主横幅区域 - 全新设计 */
.hero-section {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-bottom: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #0a0e27 0%, #050812 50%, #0a0e27 100%);
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.15) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 60px 0;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: 72px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
    letter-spacing: -1px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 28px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-weight: 500;
}

.hero-description {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-muted);
    max-width: 900px;
    margin: 0 auto;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 主内容区 */
.main-content {
    padding: 0;
    background: var(--bg-dark);
}

/* 关于区块 */
.about-section {
    padding: 100px 0;
    background: var(--bg-card);
    position: relative;
}

.about-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 48px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.about-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 212, 255, 0.1) 100%);
    pointer-events: none;
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
}

.about-text {
    font-size: 17px;
    line-height: 1.9;
    color: var(--text-secondary);
}

.about-text p {
    margin-bottom: 24px;
}

.about-text p:last-child {
    margin-bottom: 0;
}

/* 视频区块 - 全新卡片设计 */
.videos-section {
    padding: 100px 0;
    background: var(--bg-dark);
}

.section-link {
    color: var(--primary);
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s;
}

.section-link:hover {
    color: var(--primary-light);
    transform: translateX(5px);
}

.videos-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
}

.video-item {
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    position: relative;
}

.video-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.4s;
    z-index: 0;
}

.video-item:hover {
    transform: translateY(-12px) scale(1.02);
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.video-item:hover::before {
    opacity: 0.1;
}

.video-wrapper {
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    z-index: 1;
}

.video-poster {
    width: 100%;
    height: 240px;
    position: relative;
    overflow: hidden;
}

.video-poster img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.video-item:hover .video-poster img {
    transform: scale(1.15);
}

.video-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 2;
}

.video-item:hover .video-play {
    opacity: 1;
}

.video-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--gradient-primary);
    color: var(--bg-dark);
    font-size: 12px;
    font-weight: 800;
    padding: 6px 12px;
    border-radius: 6px;
    z-index: 2;
    box-shadow: var(--shadow-md);
}

.video-details {
    padding: 24px;
}

.video-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

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

.video-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    background: rgba(0, 212, 255, 0.15);
    color: var(--primary);
    font-weight: 600;
    border: 1px solid rgba(0, 212, 255, 0.3);
}

/* 平台优势区块 */
.features-section {
    padding: 100px 0;
    background: var(--bg-card);
    position: relative;
}

.features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-dark);
    border-radius: 16px;
    padding: 40px 32px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.4s;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 24px;
    border-radius: 16px;
    overflow: hidden;
    border: 2px solid var(--border-color);
    transition: all 0.4s;
}

.feature-card:hover .feature-icon {
    border-color: var(--primary);
    transform: scale(1.1);
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.feature-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-muted);
}

/* 页面标题 */
.page-banner {
    background: var(--bg-card);
    padding: 80px 0;
    text-align: center;
    border-bottom: 2px solid var(--gradient-primary);
    position: relative;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 0.3;
    pointer-events: none;
}

.page-title {
    font-size: 56px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.page-subtitle {
    font-size: 20px;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

/* 内容区块 */
.content-section {
    padding: 80px 0;
    background: var(--bg-card);
}

.content-wrapper {
    max-width: 1000px;
    margin: 0 auto;
}

.content-title {
    font-size: 48px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 40px;
    line-height: 1.2;
}

.content-image {
    margin: 50px 0;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.content-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 212, 255, 0.1) 100%);
    pointer-events: none;
}

.content-image img {
    width: 100%;
    height: auto;
    display: block;
}

.content-text {
    font-size: 17px;
    line-height: 1.9;
    color: var(--text-secondary);
}

.content-text h2 {
    font-size: 36px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 40px 0 24px;
}

.content-text p {
    margin-bottom: 24px;
}

.content-text p:last-child {
    margin-bottom: 0;
}

/* 页脚 */
.main-footer {
    background: var(--bg-darker);
    color: var(--text-primary);
    padding: 80px 0 30px;
    margin-top: 100px;
    border-top: 2px solid var(--gradient-primary);
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 80px;
    margin-bottom: 50px;
}

.footer-brand {
    max-width: 600px;
}

.footer-title {
    font-size: 28px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
}

.footer-desc {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-muted);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.link-group {
    flex: 1;
}

.link-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.link-list {
    list-style: none;
}

.link-list li {
    margin-bottom: 12px;
}

.link-list a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 15px;
    transition: all 0.3s;
}

.link-list a:hover {
    color: var(--primary);
    padding-left: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 14px;
    color: var(--text-muted);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .videos-container {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 24px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        background: var(--bg-card);
        flex-direction: column;
        padding: 24px;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s;
        z-index: 999;
        border-top: 1px solid var(--border-color);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-link {
        display: block;
        padding: 16px 0;
        border-radius: 0;
    }

    .nav-link::before {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(8px, -8px);
    }

    .hero-title {
        font-size: 48px;
    }

    .hero-subtitle {
        font-size: 20px;
    }

    .section-title {
        font-size: 36px;
    }

    .videos-container {
        grid-template-columns: 1fr;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 36px;
    }

    .page-title {
        font-size: 40px;
    }

    .content-title {
        font-size: 36px;
    }

    .section-title {
        font-size: 28px;
    }
}