:root {
  --primary: #1d4ed8;
  --primary-dark: #1e40af;
  --accent: #dc2626;
  --text: #111827;
  --text2: #4b5563;
  --muted: #9ca3af;
  --border: #e5e7eb;
  --bg: #f9fafb;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: #fff;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; font-size: 14px; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* ===== 顶部导航 ===== */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.logo-badge {
  width: 38px; height: 38px; border-radius: 10px; flex: none;
  background: linear-gradient(135deg, var(--primary), #3b82f6);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800; letter-spacing: -1px;
}
.logo-sub { display: block; font-size: 11px; font-weight: 400; color: var(--muted); margin-top: 2px; }
.nav { display: flex; align-items: center; gap: 22px; font-size: 14px; color: var(--text2); }
.nav a:hover { color: var(--primary); }
.nav a.active { color: var(--primary); font-weight: 600; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: none; border-radius: 10px; font-size: 14px; font-weight: 600;
  padding: 10px 20px; transition: all .18s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #b91c1c; }
.btn-dark { background: #1f2937; color: #fff; }
.btn-dark:hover { background: #374151; }
.btn-outline { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--muted); }
.btn-ghost { background: transparent; color: var(--text2); padding: 8px 10px; }
.btn-ghost:hover { color: var(--primary); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-lg { padding: 13px 30px; font-size: 15px; border-radius: 12px; }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn-block { width: 100%; }

/* ===== Hero ===== */
.hero {
  background:
    radial-gradient(1000px 400px at 80% -10%, rgba(59,130,246,.18), transparent),
    radial-gradient(700px 350px at 10% 110%, rgba(220,38,38,.10), transparent),
    linear-gradient(180deg, #f8fafc, #fff);
  border-bottom: 1px solid var(--border);
}
.hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; padding: 72px 0 64px; }
.hero-tag {
  display: inline-block; font-size: 13px; color: var(--primary);
  background: #eff6ff; border: 1px solid #bfdbfe; border-radius: 999px;
  padding: 5px 14px; margin-bottom: 18px;
}
.hero h1 { font-size: 40px; line-height: 1.25; letter-spacing: -1px; }
.hero h1 .hl { color: var(--accent); }
.hero p.desc { margin-top: 16px; font-size: 16px; line-height: 1.8; color: var(--text2); max-width: 480px; }
.hero-actions { margin-top: 28px; display: flex; gap: 12px; }
.hero-meta { margin-top: 26px; display: flex; gap: 26px; font-size: 13px; color: var(--muted); flex-wrap: wrap; }
.hero-card {
  background: #fff; border: 1px solid var(--border); border-radius: 18px;
  box-shadow: 0 18px 45px rgba(17,24,39,.08); padding: 26px;
}
.hero-card h3 { font-size: 16px; margin-bottom: 4px; }
.hero-card .price { color: var(--accent); font-size: 30px; font-weight: 800; margin: 10px 0 2px; }
.hero-card .price small { font-size: 13px; font-weight: 400; color: var(--muted); margin-left: 6px; }
.hero-card ul { list-style: none; margin: 14px 0 20px; font-size: 13.5px; color: var(--text2); line-height: 2; }
.hero-card ul li::before { content: "✓"; color: #16a34a; font-weight: 700; margin-right: 8px; }

/* ===== 特色 ===== */
.features { padding: 52px 0; }
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature {
  border: 1px solid var(--border); border-radius: 14px; padding: 22px;
  transition: box-shadow .2s, transform .2s;
}
.feature:hover { box-shadow: 0 10px 28px rgba(17,24,39,.07); transform: translateY(-2px); }
.feature .icon {
  width: 42px; height: 42px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  font-size: 20px; margin-bottom: 12px; background: #eff6ff;
}
.feature h4 { font-size: 15px; margin-bottom: 6px; }
.feature p { font-size: 13px; color: var(--text2); line-height: 1.7; }

/* ===== 区块 ===== */
.section { padding: 44px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 22px; }
.section-head h2 { font-size: 24px; letter-spacing: -.5px; }
.section-head a { font-size: 13px; color: var(--text2); }
.section-head a:hover { color: var(--primary); }
.card-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.card {
  border: 1px solid var(--border); border-radius: 14px; padding: 20px;
  transition: box-shadow .2s;
}
.card:hover { box-shadow: 0 8px 24px rgba(17,24,39,.06); }
.card .tag {
  display: inline-block; font-size: 12px; padding: 2px 10px; border-radius: 999px; margin-bottom: 10px;
  background: #eff6ff; color: var(--primary);
}
.card .tag.red { background: #fef2f2; color: var(--accent); }
.card h4 { font-size: 15px; line-height: 1.5; }
.card .src { margin-top: 8px; font-size: 12px; color: var(--muted); }
.card p.body { margin-top: 10px; font-size: 13.5px; color: var(--text2); line-height: 1.8; }

/* FAQ */
.faq-item { border: 1px solid var(--border); border-radius: 14px; padding: 18px 22px; margin-bottom: 12px; background: #fff; }
.faq-item h4 { font-size: 15px; }
.faq-item p { margin-top: 10px; font-size: 13.5px; color: var(--text2); line-height: 1.8; }

/* CTA */
.cta {
  margin: 30px 0 60px; border-radius: 20px; padding: 48px 40px; color: #fff;
  background: linear-gradient(120deg, #1e3a8a, #1d4ed8 55%, #3b82f6);
}
.cta h2 { font-size: 26px; margin-bottom: 10px; }
.cta p { font-size: 14.5px; opacity: .85; line-height: 1.8; max-width: 560px; }
.cta .btn { background: #fff; color: var(--primary-dark); margin-top: 22px; }
.cta .btn:hover { background: #eff6ff; }

/* ===== 表单 ===== */
.auth-wrap { max-width: 420px; margin: 56px auto 80px; padding: 0 20px; }
.auth-card { border: 1px solid var(--border); border-radius: 18px; padding: 32px; background: #fff; box-shadow: 0 10px 34px rgba(17,24,39,.06); }
.auth-card h2 { font-size: 22px; margin-bottom: 4px; }
.auth-card .sub { font-size: 13px; color: var(--text2); margin-bottom: 22px; }
.auth-switch { text-align: center; font-size: 13px; color: var(--text2); margin-top: 18px; }
.auth-switch a { color: var(--primary); font-weight: 600; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 6px; }
.field label .req { color: var(--accent); margin-left: 2px; }
.field .opt { font-weight: 400; color: var(--muted); font-size: 12px; }
.input, .select, .textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 12px; font-size: 14px; outline: none; background: #fff;
  transition: border-color .15s, box-shadow .15s;
}
.input:focus, .select:focus, .textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(29,78,216,.10); }
.input.err, .select.err { border-color: var(--accent); }
.err-msg { color: var(--accent); font-size: 12px; margin-top: 4px; }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
.code-row { display: flex; gap: 10px; }
.code-row .input { flex: 1; }
.radio-row { display: flex; gap: 18px; padding-top: 4px; }
.radio-row label { display: flex; align-items: center; gap: 6px; font-weight: 400; font-size: 14px; margin: 0; }

.notice-box {
  background: #fffbeb; border: 1px solid #fde68a; border-radius: 12px;
  padding: 16px 18px; font-size: 13.5px; line-height: 2; color: #92400e; white-space: pre-line;
}

/* ===== 页面容器 ===== */
.page { max-width: 880px; margin: 0 auto; padding: 40px 20px 80px; }
.page h1 { font-size: 26px; margin-bottom: 6px; }
.page .crumb { font-size: 13px; color: var(--muted); margin-bottom: 24px; }
.page .crumb a:hover { color: var(--primary); }
.panel { border: 1px solid var(--border); border-radius: 16px; background: #fff; padding: 26px; margin-bottom: 18px; }
.panel h3 { font-size: 16px; margin-bottom: 16px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; }

/* 表格 */
.table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.table th, .table td { padding: 11px 12px; border-bottom: 1px solid var(--border); text-align: left; }
.table th { color: var(--muted); font-weight: 600; font-size: 12.5px; background: var(--bg); }
.table tr:last-child td { border-bottom: none; }
.badge { display: inline-block; font-size: 12px; padding: 3px 10px; border-radius: 999px; }
.badge.gray { background: #f3f4f6; color: var(--text2); }
.badge.green { background: #dcfce7; color: #15803d; }
.badge.blue { background: #dbeafe; color: var(--primary-dark); }
.badge.red { background: #fee2e2; color: var(--accent); }
.badge.yellow { background: #fef3c7; color: #b45309; }

.empty { text-align: center; padding: 48px 0; color: var(--muted); font-size: 14px; }

/* 支付方式 */
.pay-method {
  display: flex; align-items: center; gap: 14px; border: 1.5px solid var(--border);
  border-radius: 12px; padding: 15px 18px; margin-bottom: 12px; cursor: pointer; transition: border-color .15s;
}
.pay-method:hover { border-color: var(--muted); }
.pay-method.sel { border-color: var(--primary); background: #f0f6ff; }
.pay-method.disabled { opacity: .5; cursor: not-allowed; }
.pay-icon {
  width: 40px; height: 40px; border-radius: 10px; flex: none;
  display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 800; font-size: 17px;
}
.pay-method .t { font-weight: 600; font-size: 14.5px; }
.pay-method .d { font-size: 12.5px; color: var(--text2); margin-top: 3px; }

/* 管理后台 */
.admin-layout { display: grid; grid-template-columns: 210px 1fr; min-height: calc(100vh - 64px); }
.admin-side { background: #111827; color: #d1d5db; padding: 22px 0; }
.admin-side .brand { color: #fff; font-weight: 700; font-size: 15px; padding: 0 22px 18px; border-bottom: 1px solid #1f2937; margin-bottom: 12px; }
.admin-side a { display: block; padding: 11px 22px; font-size: 14px; }
.admin-side a:hover { background: #1f2937; color: #fff; }
.admin-side a.active { background: var(--primary); color: #fff; }
.admin-main { padding: 28px 32px; background: var(--bg); }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 26px; }
.stat { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.stat .n { font-size: 26px; font-weight: 800; margin-top: 6px; }
.stat .l { font-size: 13px; color: var(--text2); }
.admin-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 34px 0 40px; color: var(--muted); font-size: 13px; background: var(--bg); }
.footer .links { display: flex; gap: 18px; margin-bottom: 10px; }
.footer .links a:hover { color: var(--primary); }

.toast {
  position: fixed; left: 50%; bottom: 36px; transform: translateX(-50%) translateY(20px);
  background: #111827; color: #fff; font-size: 14px; padding: 11px 22px; border-radius: 12px;
  opacity: 0; pointer-events: none; transition: all .25s; z-index: 200; max-width: 86vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.err { background: #b91c1c; }

@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; padding: 44px 0; }
  .hero h1 { font-size: 30px; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .card-list { grid-template-columns: 1fr; }
  .grid2 { grid-template-columns: 1fr; }
  .admin-layout { grid-template-columns: 1fr; }
  .admin-side { display: flex; overflow-x: auto; padding: 0; }
  .admin-side .brand { border: none; padding: 12px 18px; white-space: nowrap; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .nav { display: none; }
}