/* 全局变量 */
:root {
    --primary: #1a1a2e;
    --secondary: #e94560;
    --accent: #0f3460;
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.18);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    --radius: 20px;
    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --bg-gradient: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
    --text: #f0f0f0;
    --text-muted: #b0b0b0;
    --card-bg: rgba(255, 255, 255, 0.06);
    --hover-bg: rgba(233, 69, 96, 0.15);
}
[data-theme="dark"] {
    --bg-gradient: linear-gradient(135deg, #0a0a0a, #1a1a2e, #0f3460);
    --text: #e0e0e0;
    --text-muted: #888;
    --card-bg: rgba(255, 255, 255, 0.04);
    --glass-bg: rgba(0, 0, 0, 0.3);
    --glass-border: rgba(255, 255, 255, 0.08);
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
    font-size: 16px;
}
body {
    font-family: var(--font);
    background: var(--bg-gradient);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    transition: background 0.5s, color 0.3s;
    overflow-x: hidden;
}
a {
    color: var(--secondary);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: #ff6b81;
}
img, svg {
    max-width: 100%;
    height: auto;
    display: block;
}
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 12, 41, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
}
header.scrolled {
    background: rgba(10, 10, 20, 0.95);
    box-shadow: 0 4px 30px rgba(0,0,0,0.5);
}
nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    flex-wrap: wrap;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text);
}
.logo svg {
    width: 42px;
    height: 42px;
}
.logo span {
    background: linear-gradient(135deg, var(--secondary), #ff6b81);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
    align-items: center;
}
.nav-links a {
    color: var(--text-muted);
    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(--secondary);
    transition: var(--transition);
}
.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}
.nav-links a:hover, .nav-links a.active {
    color: var(--text);
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 8px;
}
.nav-toggle span {
    width: 28px;
    height: 2px;
    background: var(--text);
    border-radius: 4px;
    transition: var(--transition);
}
.dark-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text);
    padding: 8px 16px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}
.dark-toggle:hover {
    background: var(--hover-bg);
}

/* Hero Banner */
.hero {
    padding: 140px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 40%, rgba(233,69,96,0.15), transparent 60%);
    animation: heroGlow 12s ease-in-out infinite alternate;
}
@keyframes heroGlow {
    0% { transform: translate(0,0); }
    100% { transform: translate(5%,5%); }
}
.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-text h1 {
    font-size: 3.8rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #fff, var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-text p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 540px;
}
.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.btn {
    padding: 14px 36px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-primary {
    background: var(--secondary);
    color: #fff;
    box-shadow: 0 8px 24px rgba(233,69,96,0.3);
}
.btn-primary:hover {
    background: #d63850;
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(233,69,96,0.4);
}
.btn-outline {
    background: transparent;
    border: 2px solid var(--glass-border);
    color: var(--text);
}
.btn-outline:hover {
    border-color: var(--secondary);
    background: var(--hover-bg);
    transform: translateY(-3px);
}
.hero-visual {
    position: relative;
}
.hero-visual svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0,0,0,0.3));
}
.banner-dots {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 40px;
}
.banner-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}
.banner-dot.active {
    background: var(--secondary);
    transform: scale(1.3);
}

/* Section general */
section {
    padding: 100px 0;
}
.section-title {
    text-align: center;
    margin-bottom: 60px;
}
.section-title h2 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 16px;
}
.section-title p {
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto;
    font-size: 1.1rem;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}
.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 32px 24px;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}
.card:hover {
    transform: translateY(-8px);
    border-color: var(--secondary);
    background: rgba(233,69,96,0.06);
}
.card-icon {
    margin-bottom: 20px;
}
.card-icon svg {
    width: 48px;
    height: 48px;
}
.card h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}
.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 40px;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 16px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--secondary);
}
.timeline-item {
    position: relative;
    margin-bottom: 40px;
    padding-left: 30px;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--secondary);
    border: 3px solid var(--primary);
}
.timeline-item h4 {
    font-size: 1.2rem;
}
.timeline-item span {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* FAQ */
.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    margin-bottom: 16px;
    overflow: hidden;
    transition: var(--transition);
}
.faq-question {
    padding: 20px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.05rem;
}
.faq-question:hover {
    background: var(--hover-bg);
}
.faq-question .icon {
    transition: var(--transition);
    font-size: 1.4rem;
}
.faq-item.open .faq-question .icon {
    transform: rotate(180deg);
}
.faq-answer {
    padding: 0 24px 20px;
    color: var(--text-muted);
    display: none;
}
.faq-item.open .faq-answer {
    display: block;
}

/* HowTo */
.howto-steps {
    counter-reset: step;
}
.howto-step {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    align-items: flex-start;
}
.howto-step::before {
    counter-increment: step;
    content: counter(step);
    background: var(--secondary);
    color: #fff;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

/* Contact */
.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: 22px;
    height: 22px;
    flex-shrink: 0;
}
.map-placeholder {
    background: var(--card-bg);
    border-radius: var(--radius);
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--glass-border);
}

/* Footer */
footer {
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--glass-border);
    padding: 60px 0 30px;
    margin-top: 40px;
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}
.footer-col h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--text);
}
.footer-col ul {
    list-style: none;
}
.footer-col li {
    margin-bottom: 8px;
}
.footer-col a {
    color: var(--text-muted);
    font-size: 0.9rem;
}
.footer-col a:hover {
    color: var(--secondary);
}
.footer-bottom {
    border-top: 1px solid var(--glass-border);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Back to top */
.back-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--secondary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    box-shadow: 0 8px 24px rgba(233,69,96,0.3);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}
.back-top.visible {
    opacity: 1;
    visibility: visible;
}
.back-top:hover {
    transform: scale(1.1);
}

/* Mobile menu */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        padding: 20px 0;
        gap: 16px;
    }
    .nav-links.open {
        display: flex;
    }
    .nav-toggle {
        display: flex;
    }
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-text h1 {
        font-size: 2.4rem;
    }
    .hero-text p {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-cta {
        justify-content: center;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .section-title h2 {
        font-size: 2rem;
    }
    .back-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }
}
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .hero {
        padding: 120px 0 60px;
    }
    .hero-text h1 {
        font-size: 1.8rem;
    }
    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}
.count-up {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--secondary);
    display: inline-block;
}

/* Search */
.search-box {
    display: flex;
    gap: 8px;
    max-width: 400px;
    margin: 0 auto 40px;
}
.search-box input {
    flex: 1;
    padding: 12px 20px;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    background: var(--card-bg);
    color: var(--text);
    outline: none;
}
.search-box button {
    padding: 12px 24px;
    border-radius: 50px;
    border: none;
    background: var(--secondary);
    color: #fff;
    cursor: pointer;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    padding: 16px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.breadcrumb a {
    color: var(--text-muted);
}
.breadcrumb a:hover {
    color: var(--secondary);
}
.breadcrumb span {
    color: var(--text);
}