:root { --blue: #3b82f6; --blue-dark: #2563eb; --orange: #f97316; --orange-dark: #ea580c; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; background: #f5f7fa; color: #333; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }

/* ========== 顶部导航栏 ========== */
.topbar { background: #1e1e2a; }
.topbar-inner {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 30px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.topbar-brand {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}
.topbar-logo { width: 42px; height: 42px; border-radius: 8px; }
.topbar-name { font-size: 24px; font-weight: 800; color: #fff; letter-spacing: 1px; position: relative; }
.topbar-tm { font-size: 6px; font-weight: 400; color: #fff; vertical-align: top; margin-left: 1px; line-height: 1; }
.topbar-sep { margin: 0 8px; color: rgba(255,255,255,0.2); font-weight: 300; }
.topbar-sub { font-size: 15px; color: rgba(255,255,255,0.5); }
.topbar-links a {
    font-size: 16px;
    color: rgba(255,255,255,0.7);
    margin-left: 30px;
    text-decoration: none;
    transition: color 0.2s;
}
.topbar-links a:hover { color: #fff; }

/* ========== 底部 ========== */
.bottom-bar {
    margin-top: 30px;
    background: #1e1e2a;
    color: rgba(255,255,255,0.6);
}
.bottom-inner {
    max-width: 1300px;
    margin: 0 auto;
    padding: 28px 30px 20px;
}
.bottom-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    margin-bottom: 14px;
}
.bottom-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}
.bottom-logo { width: 36px; height: 36px; border-radius: 6px; }
.bottom-name { font-size: 18px; font-weight: 700; color: #fff; }
.bottom-tm { font-size: 6px; font-weight: 400; color: #fff; vertical-align: top; margin-left: 1px; line-height: 1; }
.bottom-slogan { font-size: 14px; color: rgba(255,255,255,0.4); }
.bottom-links a {
    font-size: 15px;
    color: rgba(255,255,255,0.5);
    margin-left: 24px;
    text-decoration: none;
    transition: color 0.2s;
}
.bottom-links a:hover { color: #fff; }
.bottom-notice {
    font-size: 13px;
    color: rgba(255,255,255,0.3);
    line-height: 1.7;
    margin-bottom: 10px;
}
.bottom-copy {
    font-size: 14px;
    color: rgba(255,255,255,0.3);
    text-align: center;
}

/* ========== 业务说明卡片 ========== */
.biz-card {
    max-width: 680px;
    margin: 30px auto 0;
    background: #fff;
    border-radius: 10px;
    padding: 22px 24px;
    text-align: left;
    box-shadow: 0 1px 8px rgba(0,0,0,0.05);
}
.biz-title { font-size: 16px; font-weight: 700; color: #222; margin-bottom: 16px; text-align: center; padding-bottom: 12px; border-bottom: 1px solid #f0f0f0; }
.biz-section { margin-bottom: 14px; }
.biz-section-title { font-size: 14px; font-weight: 600; color: #333; margin-bottom: 5px; line-height: 1.4; }
.biz-section p { font-size: 13px; color: #555; line-height: 1.8; margin: 0; padding-left: 24px; }
.biz-section p strong, .biz-list strong { color: var(--orange); }
.biz-section p em, .biz-list em { font-style: normal; color: var(--blue); font-weight: 500; }
.biz-list { list-style: none; margin: 0; padding: 0; }
.biz-list li { position: relative; padding: 2px 0 2px 36px; font-size: 13px; color: #555; line-height: 1.8; }
.biz-list li::before { content: "•"; position: absolute; left: 24px; color: #aaa; }
.biz-disclaimer { margin-top: 16px; padding: 14px 16px; background: #fffbe6; border: 1px solid #ffe58f; border-radius: 6px; }
.biz-disclaimer .biz-section-title { font-size: 13px; color: #d48806; margin-bottom: 8px; }
.biz-disclaimer .biz-list li { font-size: 12px; color: #8c6d1f; line-height: 1.7; padding-left: 12px; }
.biz-disclaimer .biz-list li::before { left: 0; }

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .topbar-inner { padding: 0 16px; height: 52px; }
    .topbar-logo { width: 32px; height: 32px; }
    .topbar-name { font-size: 17px; }
    .topbar-sep, .topbar-sub { display: none; }
    .topbar-links a { margin-left: 12px; font-size: 13px; }

    .bottom-inner { padding: 20px 16px 16px; }
    .bottom-info { flex-direction: column; gap: 12px; text-align: center; }
    .bottom-links { margin-top: 4px; }
    .bottom-links a { margin: 0 10px; font-size: 13px; }
    .bottom-notice { font-size: 11px; }
    .bottom-copy { font-size: 12px; }

    .biz-card { margin: 24px 0 0; padding: 18px 16px; }
}

@media (max-width: 480px) {
    .topbar-links a:nth-child(n+3) { display: none; }
}