/* ===== 基础与变量 ===== */
:root {
    --primary-dark: #0a0e17;
    --secondary-dark: #121826;
    --accent-blue: #00c6ff;
    --accent-purple: #6a11cb;
    --accent-green: #00ff88;
    --accent-red: #ff375f;
    --text-primary: #ffffff;
    --text-secondary: #b0b7d6;
    --card-bg: rgba(25, 30, 48, 0.8);
    --border-color: rgba(0, 198, 255, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --section-spacing: 5rem 1.5rem;
}

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

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--primary-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(106, 17, 203, 0.05) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(0, 198, 255, 0.05) 0%, transparent 20%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: var(--section-spacing);
    position: relative;
}

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

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

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 2rem;
    font-weight: 600;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    gap: 0.5rem;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    color: white;
    box-shadow: 0 4px 15px rgba(106, 17, 203, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(106, 17, 203, 0.6);
}

.section-title {
    text-align: center;
    margin-bottom: 3.5rem;
    position: relative;
}

.section-title h2 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    display: inline-block;
}

.section-title p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

/* ===== 顶部导航 ===== */
.main-header {
    background-color: rgba(10, 14, 23, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.main-nav a {
    font-weight: 600;
    font-size: 1rem;
    position: relative;
    padding: 0.5rem 0;
}

.main-nav a:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-blue), transparent);
    transition: width 0.3s ease;
}

.main-nav a:hover:after,
.main-nav a.active:after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== 轮播图 Banner ===== */
.hero-slider {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 700px;
    overflow: hidden;
    margin-top: 70px;
}

.slides-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slide.active {
    opacity: 1;
    z-index: 1;
}

.slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: brightness(0.4);
}

.slide-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 1200px;
    padding: 0 2rem;
    animation: fadeInUp 1s ease-out;
}

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

.slide-content h1 {
    font-size: 3.8rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-highlight {
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.slide-content p {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 2.5rem;
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.3);
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

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

.btn-outline:hover {
    background: rgba(0, 198, 255, 0.1);
    transform: translateY(-3px);
}

/* 轮播图导航控制 */
.slider-controls {
    position: absolute;
    bottom: 40px;
    left: 0;
    width: 100%;
    z-index: 10;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
}

.slider-dots {
    display: flex;
    gap: 1rem;
}

.slider-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: var(--transition);
}

.slider-dot.active {
    background-color: var(--accent-blue);
    transform: scale(1.3);
}

.slider-nav {
    display: flex;
    gap: 1rem;
}

.slider-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.2rem;
}

.slider-btn:hover {
    background-color: rgba(0, 198, 255, 0.2);
    border-color: var(--accent-blue);
    transform: scale(1.1);
}

/* 轮播图进度条 */
.slide-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: rgba(255, 255, 255, 0.1);
    z-index: 10;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    width: 0%;
    transition: width 5s linear;
}

.slide.active .progress-bar {
    width: 100%;
}

/* ===== 核心优势 ===== */
.core-advantages {
    background-color: var(--secondary-dark);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.advantage-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-blue), var(--accent-purple));
}

.advantage-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-blue);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.advantage-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    background: linear-gradient(135deg, rgba(0, 198, 255, 0.1), rgba(106, 17, 203, 0.1));
    color: var(--accent-blue);
}

.advantage-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

.advantage-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== 全景体验 ===== */
.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.experience-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.experience-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-green);
    box-shadow: 0 10px 25px rgba(0, 255, 136, 0.1);
}

.exp-icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.8rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    color: white;
}

.experience-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.experience-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== 用户评价 ===== */
.user-reviews {
    background-color: var(--secondary-dark);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.review-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    position: relative;
}

.review-card:before {
    content: '"';
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 4rem;
    font-family: serif;
    color: rgba(0, 198, 255, 0.2);
    line-height: 1;
}

.review-text {
    font-style: italic;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.review-author {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 600;
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

/* ===== 使命愿景 ===== */
.mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.mission-card {
    text-align: center;
    padding: 2rem;
}

.mission-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    background: rgba(0, 198, 255, 0.1);
    color: var(--accent-blue);
}

.mission-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

.mission-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== APP下载 ===== */
.app-download {
    background: linear-gradient(135deg, rgba(106, 17, 203, 0.1), rgba(0, 198, 255, 0.1));
    border-radius: 24px;
    padding: 4rem 3rem;
    text-align: center;
    margin-top: 3rem;
    border: 1px solid var(--border-color);
}

.app-download h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.app-download p {
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 2.5rem;
    font-size: 1.1rem;
}

.app-badges {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.badge:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.badge-icon {
    font-size: 2rem;
}

.badge-text p:first-child {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.badge-text p:last-child {
    font-weight: 600;
    font-size: 1.1rem;
}

/* ===== 体育资讯（带封面图） ===== */
.news-section {
    border-top: 1px solid var(--border-color);
}

.news-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.news-card {
    background: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-blue);
    box-shadow: 0 15px 30px rgba(0, 198, 255, 0.15);
}

.news-cover {
    height: 200px;
    overflow: hidden;
    position: relative;
}

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

.news-card:hover .news-cover img {
    transform: scale(1.05);
}

.news-date {
    position: absolute;
    top: 15px;
    left: 15px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 2;
}

.news-category {
    position: absolute;
    top: 15px;
    right: 15px;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue));
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 2;
}

.news-content {
    padding: 1.8rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.news-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.4;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-excerpt {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.news-author {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.news-author-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.8rem;
    font-weight: bold;
}

.news-read-more {
    color: var(--accent-blue);
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.news-read-more i {
    transition: var(--transition);
}

.news-card:hover .news-read-more i {
    transform: translateX(5px);
}

/* 资讯查看更多按钮 */
.news-view-all {
    text-align: center;
    margin-top: 3rem;
}

/* ===== 页脚 ===== */
.main-footer {
    background-color: var(--secondary-dark);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--accent-blue);
}

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: var(--text-secondary);
}

.footer-links a:hover {
    color: var(--accent-blue);
    padding-left: 5px;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.footer-contact i {
    color: var(--accent-blue);
    width: 20px;
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
    .slide-content h1 {
        font-size: 3rem;
    }
    
    .section-title h2 {
        font-size: 2.2rem;
    }
    
    .news-container {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }

    .main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--primary-dark);
        border-top: 1px solid var(--border-color);
        padding: 1.5rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 1.2rem;
    }

    .hero-slider {
        height: 80vh;
        min-height: 600px;
    }

    .slide-content h1 {
        font-size: 2.3rem;
    }

    .slide-content p {
        font-size: 1.1rem;
    }

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

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .slider-controls {
        bottom: 20px;
        flex-direction: column;
        gap: 1rem;
    }

    .app-download {
        padding: 3rem 1.5rem;
    }

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

@media (max-width: 576px) {
    .hero-slider {
        height: 70vh;
        min-height: 500px;
    }
    
    .slide-content h1 {
        font-size: 2rem;
    }
    
    .slide-content p {
        font-size: 1rem;
    }
    
    .news-cover {
        height: 180px;
    }
}