/* ===== C7娱乐中国官方网站 - 完整样式表 ===== */
/* 暗色模式默认 */
:root {
    --bg: #0a0e27;
    --surface: rgba(255,255,255,0.06);
    --text: #e0e6f0;
    --accent: #ffd700;
    --accent2: #00e5ff;
    --glass: rgba(255,255,255,0.08);
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --radius: 20px;
    --transition: 0.3s ease;
}
.dark-mode {
    --bg: #f0f4f8;
    --surface: rgba(0,0,0,0.04);
    --text: #1a1e2e;
    --glass: rgba(0,0,0,0.06);
    --shadow: 0 8px 32px rgba(0,0,0,0.1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent2); }
img, svg { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.glass {
    background: var(--glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.btn {
    display: inline-block;
    padding: 14px 36px;
    background: linear-gradient(135deg, var(--accent), #ffaa00);
    color: #0a0e27;
    font-weight: 700;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    box-shadow: 0 4px 20px rgba(255,215,0,0.3);
}
.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255,215,0,0.5);
    color: #0a0e27;
}
.btn-outline {
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent);
    box-shadow: none;
}
.btn-outline:hover {
    background: var(--accent);
    color: #0a0e27;
}
.section-title {
    font-size: 2.6rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 1.2rem;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-sub {
    text-align: center;
    font-size: 1.1rem;
    opacity: 0.8;
    max-width: 700px;
    margin: 0 auto 3rem;
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }
.card {
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius);
    padding: 30px;
    transition: var(--transition);
}
.card:hover {
    transform: translateY(-8px);
    border-color: var(--accent);
    box-shadow: 0 12px 40px rgba(255,215,0,0.15);
}
.icon-svg { width: 48px; height: 48px; margin-bottom: 16px; fill: var(--accent); }

/* 导航栏 */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(10,14,39,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    transition: var(--transition);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}
.logo {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--accent);
    letter-spacing: 1px;
}
.logo span { color: var(--accent2); }
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a {
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 4px 0;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}
.nav-links a:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 20px; }
.theme-toggle {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.4rem;
    cursor: pointer;
    padding: 4px;
    transition: var(--transition);
}
.theme-toggle:hover { color: var(--accent); }
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}
.menu-toggle span {
    width: 28px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
}

/* Hero区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 20% 50%, rgba(255,215,0,0.12) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 20%, rgba(0,229,255,0.08) 0%, transparent 50%);
    pointer-events: none;
}
.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}
.hero h1 {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}
.hero h1 .highlight {
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: 1.2rem;
    opacity: 0.85;
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}
.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Banner滑块 */
.banner-slider {
    position: relative;
    width: 100%;
    margin-top: 3rem;
    border-radius: var(--radius);
    overflow: hidden;
}
.banner-slide { display: none; }
.banner-slide.active { display: block; }
.banner-slide img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--radius);
}
.banner-dots {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
}
.banner-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}
.banner-dot.active {
    background: var(--accent);
    transform: scale(1.2);
}

/* 统计数据 */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 3rem 0;
}
.stat-item { text-align: center; padding: 20px; }
.stat-number {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--accent);
}
.stat-label { opacity: 0.7; margin-top: 4px; }

/* 关于部分 */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}
.about-text h2 { font-size: 2.2rem; margin-bottom: 1.2rem; }
.about-text p { margin-bottom: 1rem; opacity: 0.85; }

/* 时间线 */
.timeline {
    position: relative;
    padding-left: 30px;
    border-left: 2px solid var(--accent);
}
.timeline-item {
    margin-bottom: 30px;
    position: relative;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -38px;
    top: 6px;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
}
.timeline-year {
    font-weight: 800;
    color: var(--accent);
    font-size: 1.2rem;
}

/* FAQ手风琴 */
.faq-item {
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding: 18px 0;
    cursor: pointer;
}
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
}
.faq-question .icon {
    transition: var(--transition);
    font-size: 1.4rem;
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.4s ease;
    opacity: 0;
}
.faq-item.open .faq-answer {
    max-height: 300px;
    opacity: 1;
    padding-top: 12px;
}
.faq-item.open .faq-question .icon { transform: rotate(45deg); }

/* 步骤列表 */
.howto-steps { counter-reset: step; }
.howto-step {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    align-items: flex-start;
}
.howto-step::before {
    counter-increment: step;
    content: counter(step);
    background: var(--accent);
    color: #0a0e27;
    font-weight: 800;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* 联系我们 */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}
.contact-info p {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.contact-info svg {
    width: 20px;
    height: 20px;
    fill: var(--accent);
    flex-shrink: 0;
}

/* 页脚 */
footer {
    background: rgba(0,0,0,0.3);
    padding: 60px 0 30px;
    margin-top: 60px;
    border-top: 1px solid rgba(255,255,255,0.05);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
}
.footer-brand .logo {
    font-size: 1.5rem;
    margin-bottom: 12px;
}
.footer-brand p { opacity: 0.7; font-size: 0.9rem; }
.footer-links h4 {
    margin-bottom: 16px;
    font-size: 1rem;
    color: var(--accent);
}
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { opacity: 0.7; font-size: 0.9rem; }
.footer-links a:hover { opacity: 1; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.05);
    margin-top: 40px;
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
    opacity: 0.6;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--accent);
    color: #0a0e27;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}
.back-to-top.show { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: scale(1.1); }

/* 搜索覆盖层 */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
}
.search-overlay.open { display: flex; }
.search-box {
    background: var(--bg);
    padding: 40px;
    border-radius: var(--radius);
    width: 90%;
    max-width: 500px;
}
.search-box input {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--accent);
    border-radius: 50px;
    background: transparent;
    color: var(--text);
    font-size: 1rem;
    outline: none;
}
.search-box input::placeholder { color: rgba(255,255,255,0.4); }
.search-close {
    position: absolute;
    top: 20px;
    right: 30px;
    background: none;
    border: none;
    color: var(--text);
    font-size: 2rem;
    cursor: pointer;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .grid-2, .about-grid, .contact-grid { grid-template-columns: 1fr; }
    .grid-3 { grid-template-columns: 1fr 1fr; }
    .grid-4 { grid-template-columns: 1fr 1fr; }
    .stats { grid-template-columns: 1fr 1fr; }
    .hero h1 { font-size: 2.6rem; }
    .section-title { font-size: 2rem; }
    .nav-links {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.98);
        flex-direction: column;
        padding: 30px;
        gap: 20px;
        border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .nav-links.open { display: flex; }
    .menu-toggle { display: flex; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .banner-slide img { height: 240px; }
}
@media (max-width: 480px) {
    .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2rem; }
    .btn { padding: 12px 28px; font-size: 0.9rem; }
}