/* 全局重置与变量 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --primary: #1a1a2e;
    --secondary: #f5c518;
    --accent: #e94560;
    --bg: #0f0f1a;
    --text: #e0e0e0;
    --glass: rgba(255,255,255,0.08);
    --shadow: rgba(0,0,0,0.5);
    --radius: 20px;
    --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
body.dark {
    --primary: #1a1a2e;
    --secondary: #f5c518;
    --accent: #e94560;
    --bg: #0f0f1a;
    --text: #e0e0e0;
    --glass: rgba(255,255,255,0.08);
    --shadow: rgba(0,0,0,0.5);
}
body.light {
    --primary: #ffffff;
    --secondary: #d4a017;
    --accent: #c0392b;
    --bg: #f5f5f5;
    --text: #1a1a2e;
    --glass: rgba(0,0,0,0.05);
    --shadow: rgba(0,0,0,0.1);
}
body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    scroll-behavior: smooth;
}
a {
    color: var(--secondary);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: var(--accent);
}
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}
.glass {
    background: var(--glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    box-shadow: 0 8px 32px var(--shadow);
}
.section {
    padding: 100px 0;
    position: relative;
}
.section-title {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-sub {
    font-size: 1.1rem;
    opacity: 0.8;
    max-width: 600px;
    margin-bottom: 60px;
}
.btn {
    display: inline-block;
    padding: 14px 40px;
    background: var(--secondary);
    color: var(--primary);
    font-weight: 700;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}
.btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(245,197,24,0.3);
    color: var(--primary);
}
.btn-outline {
    background: transparent;
    border: 2px solid var(--secondary);
    color: var(--secondary);
}
.btn-outline:hover {
    background: var(--secondary);
    color: var(--primary);
}
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}
.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}
.card {
    background: var(--glass);
    backdrop-filter: blur(16px);
    border-radius: var(--radius);
    padding: 40px 30px;
    border: 1px solid rgba(255,255,255,0.08);
    transition: var(--transition);
    box-shadow: 0 4px 20px var(--shadow);
}
.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px var(--shadow);
}
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}
.banner {
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.banner-slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 1.2s ease;
    background: radial-gradient(ellipse at 30% 50%, var(--glass), transparent);
}
.banner-slide.active {
    opacity: 1;
}
.banner-content {
    text-align: center;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}
.banner-content h1 {
    font-size: 4rem;
    font-weight: 900;
    margin-bottom: 20px;
    line-height: 1.2;
}
.banner-content p {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.9;
}
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 24px;
    background: rgba(15,15,26,0.85);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    transition: var(--transition);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1280px;
    margin: 0 auto;
}
.nav-logo {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--secondary);
    letter-spacing: 2px;
}
.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
    font-size: 0.95rem;
    font-weight: 500;
}
.nav-links a {
    color: var(--text);
    padding: 8px 0;
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary);
    transition: var(--transition);
}
.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}
.nav-links a.active {
    color: var(--secondary);
}
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.6rem;
    cursor: pointer;
}
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15,15,26,0.98);
    z-index: 999;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 30px;
}
.mobile-menu.open {
    display: flex;
}
.mobile-menu a {
    font-size: 1.6rem;
    color: var(--text);
}
.theme-toggle {
    background: none;
    border: 2px solid var(--secondary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--secondary);
    font-size: 1.2rem;
    transition: var(--transition);
}
.theme-toggle:hover {
    background: var(--secondary);
    color: var(--primary);
}
.search-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--glass);
    border-radius: 50px;
    padding: 8px 20px;
    border: 1px solid rgba(255,255,255,0.1);
}
.search-bar input {
    background: none;
    border: none;
    color: var(--text);
    outline: none;
    font-size: 0.95rem;
    width: 180px;
}
.search-bar input::placeholder {
    color: rgba(255,255,255,0.4);
}
.search-bar button {
    background: none;
    border: none;
    color: var(--secondary);
    cursor: pointer;
    font-size: 1.2rem;
}
.counter {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--secondary);
}
.faq-item {
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding: 20px 0;
    cursor: pointer;
}
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.2rem;
    font-weight: 600;
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.3s ease;
    padding-top: 0;
}
.faq-item.open .faq-answer {
    max-height: 300px;
    padding-top: 16px;
}
.faq-icon {
    transition: transform 0.3s ease;
}
.faq-item.open .faq-icon {
    transform: rotate(45deg);
}
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 56px;
    height: 56px;
    background: var(--secondary);
    color: var(--primary);
    border: none;
    border-radius: 50%;
    font-size: 1.6rem;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(245,197,24,0.3);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 100;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}
.back-to-top:hover {
    transform: scale(1.1);
}
footer {
    background: var(--primary);
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
}
.footer-bottom {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.06);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
    opacity: 0.7;
}
.svg-icon {
    width: 48px;
    height: 48px;
    fill: var(--secondary);
}
.svg-icon-sm {
    width: 24px;
    height: 24px;
    fill: var(--secondary);
}
.breadcrumb {
    display: flex;
    gap: 8px;
    list-style: none;
    padding: 20px 0;
    font-size: 0.9rem;
}
.breadcrumb li+li::before {
    content: '›';
    margin-right: 8px;
    color: var(--secondary);
}
@media (max-width: 1024px) {
    .grid-2,
    .grid-3,
    .grid-4,
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .section-title {
        font-size: 2.2rem;
    }
    .banner-content h1 {
        font-size: 3rem;
    }
}
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .nav-toggle {
        display: block;
    }
    .grid-2,
    .grid-3,
    .grid-4,
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .banner-content h1 {
        font-size: 2.2rem;
    }
    .section {
        padding: 60px 0;
    }
    .counter {
        font-size: 2.5rem;
    }
    .search-bar {
        display: none;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}
svg {
    max-width: 100%;
    height: auto;
    display: block;
}
.img-placeholder {
    background: var(--glass);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}
.tag {
    display: inline-block;
    padding: 4px 16px;
    background: var(--glass);
    border-radius: 50px;
    font-size: 0.85rem;
    margin: 4px;
}
.partners {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}
.partner-item {
    background: var(--glass);
    border-radius: 12px;
    padding: 20px 30px;
    border: 1px solid rgba(255,255,255,0.05);
}