/* ============================================================
   完美体育中国官网 - style.css
   完整内联样式（已去除所有注释与冗余）
   随机风格：深色科技 + 渐变活力
   ============================================================ */

:root {
    --primary: #1a1a2e;
    --secondary: #e94560;
    --accent: #0f3460;
    --light: #f5f5f5;
    --glass: rgba(255,255,255,0.1);
    --shadow: 0 8px 32px rgba(0,0,0,0.2);
    --radius: 20px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --primary: #0d0d1a;
    --secondary: #ff6b6b;
    --accent: #1a3a6b;
    --light: #1e1e2f;
    --glass: rgba(0,0,0,0.3);
    --shadow: 0 8px 32px rgba(0,0,0,0.6);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--primary);
    color: var(--light);
    line-height: 1.7;
    transition: var(--transition);
}

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

a:hover {
    opacity: 0.8;
}

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

.glass {
    background: var(--glass);
    backdrop-filter: blur(12px);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,0.05);
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    background: var(--secondary);
    color: #fff;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(233,69,96,0.4);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 2rem;
    text-align: center;
    background: linear-gradient(135deg, var(--secondary), #ff8e53);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.card {
    background: var(--glass);
    backdrop-filter: blur(8px);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.05);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(0,0,0,0.3);
}

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

.lazy {
    opacity: 0;
    transition: opacity 0.6s ease;
}

.lazy.loaded {
    opacity: 1;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(26,26,46,0.9);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--secondary);
    letter-spacing: 1px;
}

nav a {
    margin: 0 14px;
    font-size: 0.95rem;
    color: var(--light);
    position: relative;
}

nav a::after {
    content: '';
    display: block;
    width: 0;
    height: 2px;
    background: var(--secondary);
    transition: var(--transition);
}

nav a:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--light);
    font-size: 2rem;
    cursor: pointer;
}

.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    padding-top: 80px;
}

.hero h1 {
    font-size: 3.8rem;
    font-weight: 900;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--secondary), #ffb347);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.3rem;
    max-width: 700px;
    margin: 0 auto 2rem;
    opacity: 0.9;
}

.banner-carousel {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    margin: 40px 0;
    min-height: 400px;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.banner-slide.active {
    opacity: 1;
    position: relative;
}

.banner-slide svg {
    width: 100%;
    height: auto;
    max-height: 400px;
}

.stats {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
    margin: 60px 0;
}

.stat-item {
    text-align: center;
    padding: 20px;
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--secondary);
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
    margin-top: 8px;
}

.faq-item {
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding: 18px 0;
    cursor: pointer;
}

.faq-question {
    font-weight: 700;
    font-size: 1.1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.faq-item.open .faq-answer {
    max-height: 400px;
    padding-top: 16px;
}

.faq-toggle {
    font-size: 1.5rem;
    transition: var(--transition);
}

.faq-item.open .faq-toggle {
    transform: rotate(45deg);
}

.news-card {
    padding: 20px;
}

.news-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.news-card .date {
    font-size: 0.85rem;
    opacity: 0.6;
    margin-bottom: 12px;
}

footer {
    background: rgba(0,0,0,0.4);
    padding: 60px 20px 30px;
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 30px;
}

.footer-grid h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--secondary);
}

.footer-grid a {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.05);
    margin-top: 30px;
    font-size: 0.85rem;
    opacity: 0.7;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--secondary);
    color: #fff;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 999;
    transition: var(--transition);
}

.back-to-top.show {
    display: flex;
}

.dark-toggle {
    background: none;
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--light);
    padding: 8px 16px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.search-box {
    display: flex;
    gap: 8px;
    max-width: 400px;
    margin: 20px auto;
}

.search-box input {
    flex: 1;
    padding: 10px 16px;
    border-radius: 50px;
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.05);
    color: var(--light);
    outline: none;
}

.search-box button {
    padding: 10px 20px;
    border-radius: 50px;
    background: var(--secondary);
    color: #fff;
    border: none;
    cursor: pointer;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    .section-title {
        font-size: 1.8rem;
    }
    nav {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(26,26,46,0.98);
        padding: 20px;
    }
    nav.open {
        display: flex;
    }
    nav a {
        margin: 10px 0;
    }
    .menu-toggle {
        display: block;
    }
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

.howto-step {
    padding: 20px;
    margin-bottom: 20px;
    border-left: 4px solid var(--secondary);
}

.howto-step h4 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.team-card {
    text-align: center;
}

.team-card svg {
    margin: 0 auto 16px;
    border-radius: 50%;
}

.testimonial-card {
    font-style: italic;
}

.testimonial-card .author {
    margin-top: 16px;
    font-weight: 600;
}

.partner-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
    margin: 40px 0;
}

.partner-grid svg {
    width: 120px;
    height: auto;
    opacity: 0.6;
    transition: var(--transition);
}

.partner-grid svg:hover {
    opacity: 1;
}

.qrcode-svg {
    width: 120px;
    height: 120px;
    margin: 0 auto;
}

.schema-hidden {
    display: none;
}