/* style.css - 开云·体育(kaiyun)官方网站 完整样式 */
:root {
    --primary: #e94560;
    --primary-dark: #c23152;
    --secondary: #0f3460;
    --accent: #16213e;
    --bg: #1a1a2e;
    --text: #f0f0f0;
    --card-bg: rgba(255, 255, 255, 0.08);
    --glass: rgba(255, 255, 255, 0.12);
    --radius: 16px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --transition: 0.3s ease;
}
[data-theme="light"] {
    --bg: #f5f5f5;
    --text: #1a1a2e;
    --card-bg: rgba(0, 0, 0, 0.04);
    --glass: rgba(255, 255, 255, 0.7);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    scroll-behavior: smooth;
    transition: background var(--transition), color var(--transition);
}
a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition);
}
a:hover {
    color: #ff6b81;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
header {
    background: var(--glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 12px 0;
}
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.6rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), #ff6b81);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
nav ul {
    list-style: none;
    display: flex;
    gap: 28px;
}
nav a {
    color: var(--text);
    font-weight: 500;
    position: relative;
    padding-bottom: 4px;
}
nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition);
}
nav a:hover::after,
nav a.active::after {
    width: 100%;
}
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
}
.theme-toggle {
    background: var(--glass);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text);
    padding: 8px 16px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all var(--transition);
}
.theme-toggle:hover {
    background: var(--primary);
    color: #fff;
}
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 50%, var(--bg) 100%);
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    opacity: 0.3;
    animation: float 6s ease-in-out infinite;
}
@keyframes float {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-30px);
    }
}
.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}
.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 30px;
}
.hero .btn {
    display: inline-block;
    padding: 16px 40px;
    background: var(--primary);
    color: #fff;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all var(--transition);
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
}
.hero .btn:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(233, 69, 96, 0.6);
}
.banner-slider {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: var(--radius);
    margin: 40px 0;
}
.banner-slide {
    display: none;
    padding: 60px 40px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    text-align: center;
    animation: fadeIn 0.6s ease;
}
.banner-slide.active {
    display: block;
}
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.banner-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 16px;
}
.banner-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all var(--transition);
}
.banner-dots span.active {
    background: var(--primary);
    width: 30px;
    border-radius: 6px;
}
.section {
    padding: 80px 0;
}
.section-title {
    text-align: center;
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 50px;
    position: relative;
}
.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary);
    margin: 12px auto 0;
    border-radius: 4px;
}
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}
.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all var(--transition);
    opacity: 0;
    transform: translateY(40px);
}
.card.visible {
    opacity: 1;
    transform: translateY(0);
}
.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    border-color: var(--primary);
}
.card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--primary);
}
.card svg {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    text-align: center;
}
.stat-item {
    padding: 30px;
    background: var(--card-bg);
    border-radius: var(--radius);
    backdrop-filter: blur(10px);
}
.stat-number {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--primary);
}
.stat-label {
    font-size: 1rem;
    opacity: 0.8;
    margin-top: 8px;
}
.faq-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    margin-bottom: 16px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
}
.faq-question {
    padding: 20px 24px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition);
}
.faq-question:hover {
    background: rgba(255, 255, 255, 0.05);
}
.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    transition: transform var(--transition);
}
.faq-item.open .faq-question::after {
    transform: rotate(45deg);
}
.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
}
.faq-item.open .faq-answer {
    max-height: 300px;
    padding: 0 24px 20px;
}
.howto-step {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    align-items: flex-start;
}
.howto-step .step-num {
    background: var(--primary);
    color: #fff;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}
.contact-info p {
    margin-bottom: 8px;
}
.contact-info svg {
    vertical-align: middle;
    margin-right: 8px;
}
footer {
    background: var(--accent);
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}
.footer-grid h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--primary);
}
.footer-grid ul {
    list-style: none;
}
.footer-grid li {
    margin-bottom: 8px;
}
.footer-grid a {
    opacity: 0.8;
}
.footer-grid a:hover {
    opacity: 1;
}
.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    opacity: 0.7;
}
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
    transition: all var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}
.back-to-top:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}
.search-box {
    display: flex;
    max-width: 400px;
    margin: 20px auto;
    background: var(--glass);
    border-radius: 50px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.15);
}
.search-box input {
    flex: 1;
    padding: 14px 20px;
    border: none;
    background: transparent;
    color: var(--text);
    font-size: 1rem;
    outline: none;
}
.search-box input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}
.search-box button {
    padding: 14px 24px;
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: background var(--transition);
}
.search-box button:hover {
    background: var(--primary-dark);
}
.breadcrumb {
    padding: 16px 0;
    font-size: 0.9rem;
    opacity: 0.7;
}
.breadcrumb span {
    margin: 0 6px;
}
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 999;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.mobile-nav.open {
    display: flex;
}
.mobile-nav a {
    color: #fff;
    font-size: 1.4rem;
    padding: 16px;
}
.mobile-nav .close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
}
@media (max-width: 768px) {
    nav ul {
        display: none;
    }
    .menu-toggle {
        display: block;
    }
    .hero h1 {
        font-size: 2rem;
    }
    .section-title {
        font-size: 1.6rem;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }
}
@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.6rem;
    }
    .hero p {
        font-size: 1rem;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
}
.hidden {
    display: none;
}