/* Reset e Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #00d084;
    --secondary-color: #1a1a2e;
    --accent-color: #ffd700;
    --dark-bg: #0f0f1e;
    --card-bg: #16213e;
    --text-primary: #ffffff;
    --text-secondary: #b8b8b8;
    --border-color: #2a2a3e;
    --hover-color: #00ff9f;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--secondary-color) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* Header */
.header {
    background: var(--secondary-color);
    border-bottom: 3px solid var(--primary-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

.logo h1 {
    color: var(--primary-color);
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.25rem;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    padding: 0.5rem 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    gap: 4px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: all 0.3s;
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 208, 132, 0.1) 0%, rgba(26, 26, 46, 0.3) 100%);
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
}

/* Features Section */
.features {
    padding: 4rem 0;
}

.features h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 208, 132, 0.3);
    border-color: var(--primary-color);
}

.feature-card img {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

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

/* Sports Section */
.sports {
    padding: 4rem 0;
    background: rgba(0, 0, 0, 0.2);
}

.sports h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

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

.sport-card {
    background: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.sport-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 208, 132, 0.3);
}

.sport-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.sport-card h3 {
    padding: 1.5rem 1.5rem 0.5rem;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.sport-card p {
    padding: 0 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-block;
    background: var(--primary-color);
    color: var(--dark-bg);
    padding: 0.75rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    margin: 0 1.5rem 1.5rem;
    transition: background 0.3s, transform 0.3s;
}

.btn:hover {
    background: var(--hover-color);
    transform: scale(1.05);
}

/* Terms Section */
.terms {
    padding: 4rem 0;
}

.terms h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

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

.term-item {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
}

.term-item h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.term-item p {
    color: var(--text-secondary);
}

/* Page Header */
.page-header {
    padding: 3rem 0;
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 208, 132, 0.1) 0%, rgba(26, 26, 46, 0.3) 100%);
}

.page-header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.breadcrumb {
    color: var(--text-secondary);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Content Section */
.content-section {
    padding: 3rem 0;
}

.content-main {
    max-width: 900px;
    margin: 0 auto;
}

.content-main article {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.content-main h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    margin-top: 2rem;
}

.content-main h2:first-child {
    margin-top: 0;
}

.content-main h3 {
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-main p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.content-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 2rem 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.content-list {
    list-style: none;
    padding-left: 0;
    margin: 1.5rem 0;
}

.content-list li {
    color: var(--text-secondary);
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.8;
}

.content-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.terms-box {
    background: rgba(0, 208, 132, 0.1);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    margin: 2rem 0;
}

.terms-box p {
    margin-bottom: 1rem;
}

.terms-box p:last-child {
    margin-bottom: 0;
}

/* Footer */
.footer {
    background: var(--secondary-color);
    border-top: 3px solid var(--primary-color);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--secondary-color);
        width: 100%;
        padding: 2rem;
        transition: left 0.3s;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
        gap: 1rem;
    }

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

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero h2 {
        font-size: 1.8rem;
    }

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

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

    .content-main article {
        padding: 2rem 1.5rem;
    }

    .content-main h2 {
        font-size: 1.6rem;
    }

    .content-main h3 {
        font-size: 1.3rem;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

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

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

    .hero {
        padding: 2rem 0;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .features,
    .sports,
    .terms {
        padding: 2rem 0;
    }

    .content-main article {
        padding: 1.5rem 1rem;
    }
}

/* SEO优化 - 图片懒加载样式 */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s;
}

img[loading="lazy"].loaded {
    opacity: 1;
}