/* ============================================================
   易游体育官方网站 - 完整样式表 (style.css)
   风格：现代科技运动风 · 渐变Banner · 毛玻璃卡片 · 暗色模式
   ============================================================ */

/* ---------- Reset & Variables ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a1a2e;
    --secondary: #16213e;
    --accent: #ff6b35;
    --accent2: #e94560;
    --bg: #0f0f1a;
    --text: #f0f0f0;
    --card-bg: rgba(255, 255, 255, 0.05);
    --glass: rgba(255, 255, 255, 0.08);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --radius: 16px;
    --transition: 0.3s ease;
    --max-width: 1200px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}

/* ---------- Dark Mode ---------- */
.dark-mode {
    --bg: #f5f5f5;
    --text: #1a1a2e;
    --card-bg: rgba(0, 0, 0, 0.03);
    --glass: rgba(0, 0, 0, 0.05);
    --primary: #ffffff;
    --secondary: #f0f0f0;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

/* ---------- Base Elements ---------- */
a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent2);
}

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

ul {
    list-style: none;
}

/* ---------- Container ---------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ---------- Header ---------- */
header {
    background: var(--primary);
    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: 15px 0;
    transition: var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 15px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

nav ul {
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
}

nav a {
    color: var(--text);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

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

.menu-toggle {
    display: none;
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text);
    font-size: 1.5rem;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.menu-toggle:hover {
    background: var(--glass);
}

.dark-toggle {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.dark-toggle:hover {
    background: var(--glass);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
    padding: 15px 0;
    font-size: 0.9rem;
    opacity: 0.7;
}

.breadcrumb span {
    margin: 0 5px;
}

.breadcrumb a {
    color: var(--text);
    opacity: 0.7;
}

.breadcrumb a:hover {
    opacity: 1;
    color: var(--accent);
}

/* ---------- Hero ---------- */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--bg));
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 50%, rgba(255, 107, 53, 0.15), transparent 60%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

.hero .btn {
    display: inline-block;
    padding: 14px 40px;
    background: var(--accent);
    color: #fff;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.hero .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 107, 53, 0.4);
    background: var(--accent2);
}

/* ---------- Banner Slider ---------- */
.banner-slider {
    position: relative;
    max-width: 1000px;
    margin: 40px auto 0;
    overflow: hidden;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.banner-slide {
    display: none;
    padding: 60px 40px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    border-radius: var(--radius);
}

.banner-slide.active {
    display: block;
    animation: fadeIn 0.8s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.banner-slide h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--accent);
}

.banner-slide p {
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.9;
}

.banner-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
}

.banner-controls button {
    background: var(--glass);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text);
    padding: 10px 20px;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    font-weight: 500;
}

.banner-controls button:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ---------- Sections ---------- */
section {
    padding: 70px 0;
}

.section-title {
    font-size: 2.2rem;
    text-align: center;
    margin-bottom: 50px;
    position: relative;
    font-weight: 700;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--accent);
    margin: 15px auto 0;
    border-radius: 2px;
}

/* ---------- Grid Systems ---------- */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

/* ---------- Card ---------- */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
    padding: 30px;
    transition: var(--transition);
}

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

.card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--accent);
}

.card h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text);
}

.card p {
    opacity: 0.85;
    line-height: 1.8;
}

.card svg {
    width: 60px;
    height: 60px;
    margin-bottom: 15px;
    fill: var(--accent);
    transition: var(--transition);
}

.card:hover svg {
    transform: scale(1.05);
}

/* ---------- Stats Section ---------- */
.stats {
    background: linear-gradient(135deg, var(--secondary), var(--primary));
}

.stat-item {
    text-align: center;
    padding: 30px;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

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

/* ---------- Testimonials ---------- */
.testimonial-card {
    background: var(--glass);
    border-radius: var(--radius);
    padding: 30px;
    border-left: 4px solid var(--accent);
    transition: var(--transition);
}

.testimonial-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-3px);
}

.testimonial-card p {
    font-style: italic;
    line-height: 1.8;
}

.testimonial-author {
    margin-top: 15px;
    font-weight: 600;
    color: var(--accent);
}

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

.faq-item:hover {
    background: var(--glass);
    border-radius: 8px;
    padding-left: 10px;
    padding-right: 10px;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
}

.faq-question span {
    transition: var(--transition);
    font-size: 1.5rem;
    line-height: 1;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    opacity: 0.8;
    line-height: 1.8;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding-top: 15px;
}

.faq-item.active .faq-question span {
    transform: rotate(45deg);
    color: var(--accent);
}

/* ---------- Search Box ---------- */
.search-box {
    display: flex;
    max-width: 400px;
    margin: 0 auto 40px;
}

.search-box input {
    flex: 1;
    padding: 12px 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: var(--glass);
    border-radius: 50px 0 0 50px;
    color: var(--text);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.search-box input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(255, 107, 53, 0.2);
}

.search-box button {
    padding: 12px 25px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 0 50px 50px 0;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.search-box button:hover {
    background: var(--accent2);
}

/* ---------- Footer ---------- */
footer {
    background: var(--primary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 60px 0 30px;
    transition: var(--transition);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

footer h4 {
    margin-bottom: 20px;
    color: var(--accent);
    font-size: 1.1rem;
}

footer ul li {
    margin-bottom: 10px;
}

footer a {
    color: var(--text);
    opacity: 0.7;
    transition: var(--transition);
}

footer a:hover {
    opacity: 1;
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 25px;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
    line-height: 1.8;
}

/* ---------- Back to Top ---------- */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--accent);
    color: #fff;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    border: none;
    z-index: 999;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: scale(1.1);
    background: var(--accent2);
}

/* ---------- Scroll Animation (fade-up) ---------- */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- SVG Color ---------- */
.svg-color {
    fill: var(--accent);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

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

    .hero .btn {
        padding: 12px 30px;
        font-size: 1rem;
    }

    nav ul {
        display: none;
        flex-direction: column;
        width: 100%;
        gap: 10px;
        padding: 20px 0;
        background: var(--primary);
        border-radius: var(--radius);
        margin-top: 10px;
    }

    nav ul.show {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .header-inner {
        flex-wrap: wrap;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .banner-slide {
        padding: 30px 20px;
    }

    .banner-slide h3 {
        font-size: 1.4rem;
    }

    .stat-number {
        font-size: 2.2rem;
    }

    .card {
        padding: 20px;
    }

    .back-to-top {
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
        bottom: 20px;
        right: 20px;
    }

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

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

    .hero h1 {
        font-size: 2.5rem;
    }
}

@media (min-width: 1025px) {
    .hero h1 {
        font-size: 3.2rem;
    }
}

/* ---------- Dark Mode Adjustments ---------- */
.dark-mode .card {
    border-color: rgba(0, 0, 0, 0.08);
}

.dark-mode .banner-slide {
    border-color: rgba(0, 0, 0, 0.1);
}

.dark-mode header {
    border-bottom-color: rgba(0, 0, 0, 0.1);
}

.dark-mode .menu-toggle,
.dark-mode .dark-toggle {
    border-color: rgba(0, 0, 0, 0.2);
    color: var(--text);
}

.dark-mode .faq-item {
    border-bottom-color: rgba(0, 0, 0, 0.1);
}

.dark-mode .search-box input {
    border-color: rgba(0, 0, 0, 0.2);
}

.dark-mode footer {
    border-top-color: rgba(0, 0, 0, 0.1);
}

.dark-mode .footer-bottom {
    border-top-color: rgba(0, 0, 0, 0.08);
}

/* ---------- Custom Scrollbar ---------- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent2);
}

/* ---------- Selection ---------- */
::selection {
    background: var(--accent);
    color: #fff;
}

/* ---------- Focus Styles ---------- */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ---------- Print ---------- */
@media print {
    header,
    .back-to-top,
    .banner-controls,
    .menu-toggle,
    .dark-toggle {
        display: none !important;
    }
}