/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0F1419; /* 深蓝色 */
    --secondary-color: #FFD700; /* 金色 */
    --accent-color: #1A2332; /* 深灰蓝 */
    --chinese-red: #DC143C; /* 中国红 */
    --chinese-gold: #FFD700; /* 中国金 */
    --jade-green: #00CED1; /* 现代青色 */
    --electric-blue: #00D4FF; /* 电光蓝 */
    --neon-purple: #9333EA; /* 霓虹紫 */
    --text-primary: #FFFFFF;
    --text-secondary: #E2E8F0;
    --text-muted: #94A3B8;
    --background-primary: #0a0a0f;
    --background-secondary: rgba(15, 20, 25, 0.8);
    --background-glass: rgba(255, 255, 255, 0.1);
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 35px 70px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 30px rgba(255, 215, 0, 0.3);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --glass-border: 1px solid rgba(255, 255, 255, 0.2);
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background-primary);
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(147, 51, 234, 0.1) 0%, transparent 50%);
    animation: backgroundShift 20s ease-in-out infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes backgroundShift {
    0%, 100% {
        transform: scale(1) rotate(0deg);
        opacity: 0.3;
    }
    33% {
        transform: scale(1.1) rotate(120deg);
        opacity: 0.5;
    }
    66% {
        transform: scale(0.9) rotate(240deg);
        opacity: 0.4;
    }
}

/* 粒子背景 */
.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.particle {
    position: absolute;
    background: rgba(255, 215, 0, 0.6);
    border-radius: 50%;
    animation: particleFloat 15s linear infinite;
}

.particle:nth-child(2n) {
    background: rgba(0, 212, 255, 0.4);
    animation-duration: 20s;
    animation-delay: -5s;
}

.particle:nth-child(3n) {
    background: rgba(147, 51, 234, 0.3);
    animation-duration: 25s;
    animation-delay: -10s;
}

@keyframes particleFloat {
    0% {
        transform: translateY(100vh) translateX(0) scale(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
        transform: translateY(90vh) translateX(10vw) scale(0.5);
    }
    90% {
        opacity: 1;
        transform: translateY(10vh) translateX(-10vw) scale(1);
    }
    100% {
        transform: translateY(-10vh) translateX(20vw) scale(0);
        opacity: 0;
    }
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--background-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: var(--glass-border);
    box-shadow: var(--glass-shadow);
    z-index: 1000;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar:hover {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(30px) saturate(200%);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: bold;
    color: var(--secondary-color);
}

.logo-icon {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon i {
    position: absolute;
    font-size: 32px;
    color: var(--secondary-color);
    animation: rotate 8s linear infinite;
}

.logo-icon .inner {
    font-size: 20px;
    color: var(--chinese-red);
    animation: rotate-reverse 6s linear infinite;
}

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

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

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--secondary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: width 0.3s ease;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color), var(--electric-blue));
    color: var(--primary-color);
    border: none;
    padding: 16px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-glow);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 20px 60px rgba(255, 215, 0, 0.4);
    background: linear-gradient(135deg, var(--electric-blue), var(--secondary-color));
}

.btn-secondary {
    background: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

/* 首页横幅 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%),
                url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNjAiIGhlaWdodD0iNjAiIHZpZXdCb3g9IjAgMCA2MCA2MCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPGcgZmlsbD0ibm9uZSIgZmlsbC1ydWxlPSJldmVub2RkIj4KPGcgZmlsbD0iIzFFMjk0MiIgZmlsbC1vcGFjaXR5PSIwLjAzIj4KPGNpcmNsZSBjeD0iMzAiIGN5PSIzMCIgcj0iMiIvPgo8L2c+CjwvZz4KPC9zdmc+');
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.05;
    background-image:
        radial-gradient(circle at 25% 25%, var(--secondary-color) 2px, transparent 2px),
        radial-gradient(circle at 75% 75%, var(--chinese-red) 1px, transparent 1px);
    background-size: 50px 50px, 30px 30px;
    background-position: 0 0, 25px 25px;
}

.chinese-decorations {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

.cloud-decoration {
    position: absolute;
    width: 120px;
    height: 80px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    animation: float-cloud 15s ease-in-out infinite;
}

.cloud-decoration::before,
.cloud-decoration::after {
    content: '';
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.cloud-decoration::before {
    width: 80px;
    height: 60px;
    top: -10px;
    left: 20px;
}

.cloud-decoration::after {
    width: 60px;
    height: 40px;
    top: 10px;
    right: -10px;
}

.cloud-left {
    top: 20%;
    left: -10%;
    animation-delay: 0s;
}

.cloud-right {
    top: 60%;
    right: -10%;
    animation-delay: 5s;
}

@keyframes float-cloud {
    0%, 100% { transform: translateX(0) translateY(0) scale(1); }
    25% { transform: translateX(30px) translateY(-10px) scale(1.05); }
    50% { transform: translateX(60px) translateY(0) scale(1); }
    75% { transform: translateX(90px) translateY(-5px) scale(1.02); }
}

.lantern-decoration {
    position: absolute;
    width: 30px;
    height: 40px;
    background: linear-gradient(to bottom, var(--chinese-red), var(--chinese-gold));
    border-radius: 15px 15px 5px 5px;
    animation: swing-lantern 6s ease-in-out infinite;
}

.lantern-decoration::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: #8B4513;
    border-radius: 2px 2px 0 0;
}

.lantern-decoration::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--chinese-gold);
    border-radius: 1px;
    box-shadow: 0 0 5px var(--chinese-gold);
}

.lantern-1 {
    top: 15%;
    left: 10%;
    animation-delay: 0s;
}

.lantern-2 {
    top: 25%;
    right: 15%;
    animation-delay: 3s;
}

@keyframes swing-lantern {
    0%, 100% { transform: rotate(-5deg); }
    50% { transform: rotate(5deg); }
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 25% 25%, rgba(255, 215, 0, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(147, 51, 234, 0.15) 0%, transparent 50%);
    animation: heroGlow 15s ease-in-out infinite;
    pointer-events: none;
}

@keyframes heroGlow {
    0%, 100% {
        transform: scale(1) rotate(0deg);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.2) rotate(180deg);
        opacity: 0.8;
    }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(30, 41, 66, 0.8), rgba(42, 52, 65, 0.6));
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

.hero-header {
    position: relative;
    margin-bottom: 20px;
}

.traditional-border {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--secondary-color), transparent);
    border-radius: 2px;
}

.traditional-border:first-child {
    top: -20px;
}

.traditional-border:last-child {
    bottom: -20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--text-primary), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    display: block;
    color: var(--secondary-color);
    font-size: 1.2rem;
    margin-top: 10px;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 30px auto 40px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin: 40px 0;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--secondary-color);
    display: block;
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-image {
    position: absolute;
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
}

.floating-elements {
    position: relative;
}

.element-1, .element-2, .element-3 {
    position: absolute;
    color: var(--secondary-color);
    opacity: 0.3;
    animation: float 6s ease-in-out infinite;
}

.element-1 {
    top: -50px;
    left: -30px;
    font-size: 24px;
    animation-delay: 0s;
}

.element-2 {
    top: 20px;
    left: 50px;
    font-size: 18px;
    animation-delay: 2s;
}

.element-3 {
    top: 80px;
    left: -60px;
    font-size: 20px;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* 通用容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--text-primary), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 预约区域 */
.booking-section {
    padding: 100px 0;
    background: var(--background-secondary);
}

.booking-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--primary-color);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--background-primary);
    color: var(--text-primary);
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.btn-full {
    width: 100%;
    padding: 16px;
    font-size: 16px;
}

/* 助教区域 */
.coaches-section {
    padding: 100px 0;
    background: var(--background-primary);
}

.coaches-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.coach-card {
    background: var(--background-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--glass-shadow);
    border: var(--glass-border);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.coach-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1), rgba(0, 212, 255, 0.1));
    opacity: 0;
    transition: opacity 0.5s ease;
    pointer-events: none;
}

.coach-card:hover::before {
    opacity: 1;
}

.coach-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.coach-image {
    position: relative;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.coach-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px;
}

.coach-level {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--secondary-color);
    color: var(--primary-color);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.coach-info {
    padding: 25px;
}

.coach-info h3 {
    font-size: 1.5rem;
    margin-bottom: 5px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.coach-title {
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 15px;
}

.coach-desc {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.coach-stats {
    display: flex;
    gap: 20px;
}

.coach-stats span {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-muted);
    font-size: 14px;
}

.coach-stats span i {
    color: var(--secondary-color);
}

/* 社交区域 */
.social-section {
    padding: 100px 0;
    background: var(--background-secondary);
}

.social-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: start;
}

.social-feed {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.feed-item {
    background: var(--primary-color);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feed-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.feed-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--secondary-color);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
}

.post-time {
    color: var(--text-muted);
    font-size: 14px;
}

.feed-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 15px;
}

.feed-actions {
    display: flex;
    gap: 20px;
}

.feed-actions span {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
    transition: color 0.3s ease;
}

.feed-actions span:hover {
    color: var(--secondary-color);
}

.social-stats {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.stat-card {
    background: var(--primary-color);
    border-radius: 12px;
    padding: 25px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--secondary-color), #F4C430);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 20px;
}

.stat-info .stat-number {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.stat-info .stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 体育项目区域 */
.sports-section {
    padding: 100px 0;
    background: var(--background-primary);
}

.sports-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    margin-bottom: 80px;
    align-items: center;
}

.intro-content h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.intro-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

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

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px;
    background: var(--background-secondary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.feature-item i {
    color: var(--secondary-color);
    font-size: 20px;
}

.feature-item span {
    font-weight: 600;
    color: var(--text-primary);
}

.sports-collage {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    max-width: 400px;
}

.sport-item {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--secondary-color), var(--chinese-red));
    border-radius: 15px;
    padding: 20px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.sport-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.3);
}

.sport-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.sport-item span {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-color);
}

.sport-item.cycling { background: linear-gradient(135deg, #FF6B35, #F7931E); }
.sport-item.swimming { background: linear-gradient(135deg, #4FC3F7, #29B6F6); }
.sport-item.hiking { background: linear-gradient(135deg, #8BC34A, #689F38); }
.sport-item.golf { background: linear-gradient(135deg, #4CAF50, #388E3C); }
.sport-item.tennis { background: linear-gradient(135deg, #FF9800, #F57C00); }
.sport-item.yoga { background: linear-gradient(135deg, #9C27B0, #7B1FA2); }
.sport-item.running { background: linear-gradient(135deg, #E91E63, #C2185B); }
.sport-item.more { background: linear-gradient(135deg, var(--secondary-color), var(--chinese-gold)); }

.sports-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 80px;
}

.category-card {
    background: var(--background-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 20px;
    padding: 30px;
    border: var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    position: relative;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.05), rgba(147, 51, 234, 0.05));
    opacity: 0;
    transition: opacity 0.5s ease;
    pointer-events: none;
    border-radius: 20px;
}

.category-card:hover::before {
    opacity: 1;
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-color: var(--secondary-color);
}

.category-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--secondary-color), var(--chinese-red));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: var(--primary-color);
}

.category-card h4 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.category-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.category-stats {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.category-stats span {
    background: var(--background-primary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    color: var(--secondary-color);
    font-weight: 600;
}

.platform-advantages {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.advantage-item {
    text-align: center;
    padding: 30px;
    background: var(--background-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 20px;
    border: var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(147, 51, 234, 0.05));
    opacity: 0;
    transition: opacity 0.5s ease;
    pointer-events: none;
    border-radius: 20px;
}

.advantage-item:hover::before {
    opacity: 1;
}

.advantage-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--secondary-color);
}

.advantage-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--secondary-color), var(--chinese-gold));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary-color);
}

.advantage-item h4 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.advantage-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 特色区域 */
.features-section {
    padding: 100px 0;
    background: var(--background-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.feature-card {
    text-align: center;
    padding: 40px 30px;
    background: var(--background-secondary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary-color), #F4C430);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 30px;
    margin: 0 auto 20px;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 联系我们 */
.contact-section {
    padding: 100px 0;
    background: var(--background-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.contact-item i {
    font-size: 24px;
    color: var(--secondary-color);
    margin-top: 5px;
}

.contact-item h4 {
    color: var(--text-primary);
    margin-bottom: 5px;
    font-size: 1.1rem;
}

.contact-item p {
    color: var(--text-secondary);
    line-height: 1.5;
}

.contact-form {
    background: var(--primary-color);
    padding: 40px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--background-primary);
    color: var(--text-primary);
    font-size: 16px;
    transition: border-color 0.3s ease;
    margin-bottom: 0;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.contact-form textarea {
    resize: vertical;
    min-height: 100px;
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: bold;
    color: var(--secondary-color);
}

.footer-logo i {
    color: var(--chinese-red);
    font-size: 28px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    margin-bottom: 8px;
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: var(--secondary-color);
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--background-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-stats {
        gap: 30px;
    }

    .nav-menu {
        display: none;
    }

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

    .sports-intro {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .sports-collage {
        grid-template-columns: repeat(4, 1fr);
        max-width: none;
    }

    .sports-categories {
        grid-template-columns: 1fr;
    }

    .platform-advantages {
        grid-template-columns: 1fr;
    }

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

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

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

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

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

/* APP下载区域 */
.download-section {
    padding: 100px 0;
    background: var(--background-primary);
    position: relative;
}

.download-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 30% 70%, rgba(0, 82, 217, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(245, 158, 11, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.app-showcase {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.phone-mockup {
    position: relative;
    width: 280px;
    height: 560px;
    margin: 0 auto;
    background: linear-gradient(145deg, #1a1a1a, #2a2a2a);
    border-radius: 30px;
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.5),
        inset 0 0 0 1px rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 150px;
    height: 25px;
    background: #000;
    border-radius: 15px;
    z-index: 3;
}

.phone-screen {
    position: absolute;
    top: 60px;
    left: 20px;
    right: 20px;
    bottom: 60px;
    background: var(--background-primary);
    border-radius: 20px;
    overflow: hidden;
}

.app-interface {
    padding: 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.app-header {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 30px;
    background: linear-gradient(135deg, var(--secondary-color), var(--electric-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-features {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    flex: 1;
}

.app-features .feature-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: var(--background-glass);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.app-features .feature-item i {
    font-size: 20px;
    color: var(--secondary-color);
    width: 30px;
    text-align: center;
}

.app-features .feature-item span {
    color: var(--text-secondary);
    font-weight: 500;
}

.app-description h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.app-description ul {
    list-style: none;
    padding: 0;
}

.app-description li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.app-description li i {
    color: var(--sport-green);
    font-size: 14px;
}

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

.download-card {
    background: var(--background-glass);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 30px;
    border: var(--glass-border);
    box-shadow: var(--glass-shadow);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.platform-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--secondary-color), var(--electric-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary-color);
    box-shadow: var(--shadow-glow);
}

.download-card:nth-child(1) .platform-icon {
    background: linear-gradient(135deg, #4CAF50, #45a049);
}

.download-card:nth-child(2) .platform-icon {
    background: linear-gradient(135deg, #007AFF, #0056CC);
}

.download-card:nth-child(3) .platform-icon {
    background: linear-gradient(135deg, #07C160, #00A857);
}

.download-card h4 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.download-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 14px;
}

.download-btn {
    background: var(--background-glass);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.download-btn:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.android-btn:hover {
    background: #4CAF50;
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.4);
}

.ios-btn:hover {
    background: #007AFF;
    box-shadow: 0 0 20px rgba(0, 122, 255, 0.4);
}

.wechat-btn:hover {
    background: #07C160;
    box-shadow: 0 0 20px rgba(7, 193, 96, 0.4);
}

.qr-code {
    width: 120px;
    height: 120px;
    margin: 0 auto;
    background: var(--background-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.qr-code:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow);
}

.qr-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.qr-placeholder i {
    font-size: 32px;
}

.qr-placeholder span {
    font-size: 12px;
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-stats {
        gap: 30px;
    }

    .nav-menu {
        display: none;
    }

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

    .sports-intro {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .sports-collage {
        grid-template-columns: repeat(4, 1fr);
        max-width: none;
    }

    .sports-categories {
        grid-template-columns: 1fr;
    }

    .sports-categories {
        grid-template-columns: 1fr;
    }

    .download-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .phone-mockup {
        width: 220px;
        height: 440px;
    }

    .app-showcase {
        gap: 35px;
    }

    .app-description h3 {
        font-size: 1.6rem;
    }

    .app-features {
        gap: 20px;
    }

    .app-header {
        font-size: 17px;
    }

    .download-buttons {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

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

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

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

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

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .booking-form {
        padding: 30px 20px;
    }

    .sports-collage {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }

    .sport-item {
        padding: 15px;
    }

    .sport-item i {
        font-size: 1.5rem;
    }

    .sport-item span {
        font-size: 0.8rem;
    }

    .platform-features {
        grid-template-columns: 1fr;
    }

    .category-stats {
        flex-direction: column;
        gap: 10px;
    }

    .download-card {
        padding: 20px;
    }

    .phone-mockup {
        width: 200px;
        height: 400px;
    }

    .app-showcase {
        gap: 30px;
        align-items: center;
    }

    .app-description h3 {
        font-size: 1.5rem;
        margin-bottom: 15px;
    }

    .app-description li {
        font-size: 14px;
        margin-bottom: 10px;
    }

    .app-features .feature-item {
        padding: 12px;
        font-size: 14px;
    }

    .app-features {
        gap: 15px;
    }

    .app-header {
        font-size: 16px;
        margin-bottom: 15px;
    }

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

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