:root {
    --red: #e60012;
    --red-dark: #b8000e;
    --red-light: #ff3b30;
    --text: #222;
    --muted: #666;
    --bg-alt: #fff5f5;
    --border: #ffd6d6;
    --radius: 14px;
    --shadow: 0 6px 24px rgba(230, 0, 18, .12);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    line-height: 1.7;
    background: #fff;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

a { color: inherit; text-decoration: none; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, .95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--red);
}

.brand img { border-radius: 10px; }

.nav-links { display: flex; gap: 26px; font-size: 15px; }
.nav-links a { color: var(--text); transition: color .2s; }
.nav-links a:hover { color: var(--red); }

.hero {
    background: linear-gradient(160deg, var(--red) 0%, var(--red-light) 100%);
    color: #fff;
    text-align: center;
    padding: 70px 0 80px;
}

.hero-logo {
    border-radius: 22px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .25);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 32px;
    font-weight: 800;
    max-width: 800px;
    margin: 0 auto 18px;
    line-height: 1.4;
}

.subtitle {
    font-size: 17px;
    max-width: 680px;
    margin: 0 auto 34px;
    opacity: .95;
}

.subtitle strong { color: #fff; border-bottom: 2px solid rgba(255, 255, 255, .6); }

.cta-group {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 700;
    transition: transform .15s, box-shadow .2s, background .2s;
    cursor: pointer;
}

.btn:hover { transform: translateY(-2px); }

.btn-icon { display: inline-flex; align-items: center; }
.btn-icon svg { width: 20px; height: 20px; display: block; }

.btn-primary {
    background: #fff;
    color: var(--red);
    box-shadow: 0 6px 18px rgba(0, 0, 0, .2);
}

.btn-primary:hover { box-shadow: 0 10px 26px rgba(0, 0, 0, .3); }

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, .8);
}

.btn-outline:hover { background: rgba(255, 255, 255, .15); }

.btn-lg { padding: 16px 48px; font-size: 18px; }

.update-time {
    margin-top: 30px;
    font-size: 14px;
    opacity: .85;
}

.section { padding: 70px 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
    text-align: center;
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 46px;
    color: var(--text);
    position: relative;
}

.section-title::after {
    content: "";
    display: block;
    width: 56px;
    height: 4px;
    background: var(--red);
    border-radius: 2px;
    margin: 14px auto 0;
}

.cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}

.card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px 22px;
    text-align: center;
    transition: transform .2s, box-shadow .2s;
}

.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.card-ico { font-size: 40px; margin-bottom: 14px; color: var(--red); line-height: 1; }
.card-ico svg { width: 42px; height: 42px; display: inline-block; vertical-align: middle; }
.card h3 { font-size: 18px; margin-bottom: 10px; color: var(--red); }
.card p { font-size: 14px; color: var(--muted); }

.download-inner { text-align: center; }
.download-inner img { border-radius: 20px; margin-bottom: 18px; box-shadow: var(--shadow); }
.download-inner p { color: var(--muted); max-width: 560px; margin: 0 auto 30px; }

.guide-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.guide-col {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px;
}

.guide-col h3 { color: var(--red); margin-bottom: 18px; font-size: 20px; }
.ico-inline { display: inline-flex; align-items: center; vertical-align: -4px; }
.ico-inline svg { width: 20px; height: 20px; display: block; }
.guide-col ol { padding-left: 22px; }
.guide-col li { margin-bottom: 12px; color: var(--text); }

.warn {
    margin-top: 30px;
    background: #fff8e6;
    border: 1px solid #ffe08a;
    border-radius: var(--radius);
    padding: 18px 22px;
    font-size: 14px;
    color: #8a5a00;
}

.faq-list { max-width: 760px; margin: 0 auto; }

.legal { max-width: 800px; }
.legal .section-title { text-align: left; }
.legal .section-title::after { margin: 14px 0 0; }
.legal-note { background: #fff8e6; border: 1px solid #ffe08a; border-radius: var(--radius); padding: 14px 18px; font-size: 14px; color: #8a5a00; margin-bottom: 26px; }
.legal h2 { font-size: 19px; color: var(--red); margin: 24px 0 8px; }
.legal p { color: var(--muted); }

details {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px 22px;
    margin-bottom: 14px;
}

summary {
    font-weight: 700;
    cursor: pointer;
    padding: 14px 0;
    list-style: none;
    position: relative;
    padding-right: 30px;
}

summary::-webkit-details-marker { display: none; }

summary::after {
    content: "+";
    position: absolute;
    right: 4px;
    top: 12px;
    font-size: 22px;
    color: var(--red);
    transition: transform .2s;
}

details[open] summary::after { content: "−"; }

details p { padding: 0 0 16px; color: var(--muted); }

.site-footer {
    background: #1a1a1a;
    color: #ccc;
    text-align: center;
    padding: 40px 0;
}

.site-footer img { border-radius: 10px; margin-bottom: 12px; }
.site-footer p { font-size: 14px; margin: 4px 0; }
.copy { opacity: .7; }
.footer-links { font-size: 13px; margin-top: 8px; }
.footer-links a { color: #ddd; transition: color .2s; }
.footer-links a:hover { color: #fff; }
.beian:empty { display: none; }
.beian a { color: #999; }
.update-time-foot { opacity: .6; font-size: 13px; }

@media (max-width: 900px) {
    .cards { grid-template-columns: repeat(2, 1fr); }
    .guide-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .nav-links { display: none; }
    .hero { padding: 50px 0 60px; }
    .hero h1 { font-size: 24px; }
    .subtitle { font-size: 15px; }
    .btn { padding: 12px 26px; font-size: 15px; }
    .section { padding: 50px 0; }
    .section-title { font-size: 23px; }
    .cards { grid-template-columns: 1fr; }
}