/* 码思在线考试系统 —— 对外商城静态页样式（/shop/） */
* { box-sizing: border-box; }
:root {
  --brand: #2f7cf6;
  --brand-dark: #1c5fd0;
  --ink: #1f2733;
  --muted: #6b7686;
  --line: #e8ecf2;
  --bg: #f6f8fb;
  --price: #f5533d;
}
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* ---------- 顶栏 ---------- */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255,255,255,.94);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; height: 64px; gap: 26px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 19px; letter-spacing: .5px; }
.logo .mark {
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), #4aa3ff);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 17px; font-weight: 800;
}
.logo .sub { font-size: 11px; color: var(--muted); font-weight: 400; letter-spacing: 0; display: block; margin-top: -2px; }
.nav-links { display: flex; gap: 22px; margin-left: 14px; font-size: 15px; color: #414b5a; }
.nav-links a:hover { color: var(--brand); }
.nav-spacer { flex: 1; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 40px; padding: 0 20px; border-radius: 8px; font-size: 15px; cursor: pointer;
  border: 1px solid transparent; transition: .15s;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: #fff; border-color: #cfd8e6; color: #364152; }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn-lg { height: 46px; padding: 0 26px; font-size: 16px; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(160deg, #eef4ff 0%, #f7faff 55%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
}
.hero .wrap { padding: 62px 20px 54px; }
.hero h1 { font-size: 34px; line-height: 1.3; margin: 0 0 14px; }
.hero h1 em { font-style: normal; color: var(--brand); }
.hero p.lead { font-size: 16px; color: #46505f; max-width: 720px; margin: 0 0 26px; }
.hero .cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .tags { margin-top: 22px; display: flex; gap: 10px; flex-wrap: wrap; }
.tag { font-size: 13px; color: #3a4658; background: #fff; border: 1px solid var(--line); padding: 5px 12px; border-radius: 999px; }

/* ---------- 通用区块 ---------- */
.section { padding: 54px 0; }
.section.alt { background: var(--bg); }
.section-head { margin-bottom: 26px; }
.section-head h2 { font-size: 24px; margin: 0 0 6px; }
.section-head p { color: var(--muted); margin: 0; font-size: 15px; }

/* ---------- 服务能力 ---------- */
.feats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feat { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 22px 20px; }
.feat .ico { width: 40px; height: 40px; border-radius: 10px; background: #eaf2ff; color: var(--brand); display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 12px; }
.feat h3 { margin: 0 0 6px; font-size: 16px; }
.feat p { margin: 0; color: var(--muted); font-size: 13.5px; }

/* ---------- 商品卡片 ---------- */
.products { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
  display: flex; flex-direction: column; transition: .18s;
}
.card:hover { box-shadow: 0 12px 30px rgba(28,66,132,.10); transform: translateY(-2px); border-color: #d6e3f8; }
.card .cover { height: 190px; background: linear-gradient(135deg, #e9f1ff, #f4f8ff); display: flex; align-items: center; justify-content: center; color: #9fb6d8; font-size: 13px; overflow: hidden; }
.card .cover img { width: 100%; height: 100%; object-fit: cover; }
.card .body { padding: 16px 18px 18px; display: flex; flex-direction: column; flex: 1; }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card .desc { color: var(--muted); font-size: 13.5px; margin: 0 0 12px; flex: 1; min-height: 40px; }
.card .meta { font-size: 12.5px; color: #9aa4b2; margin-bottom: 12px; }
.card .foot { display: flex; align-items: flex-end; justify-content: space-between; gap: 10px; }
.card .price { color: var(--price); font-weight: 700; font-size: 20px; }
.card .price small { font-size: 12px; color: var(--muted); font-weight: 400; margin-left: 2px; }
.card .price .unit { font-size: 13px; font-weight: 400; }
.card .price.free { color: #2fa46a; font-size: 17px; }
.loading, .empty { color: var(--muted); font-size: 14px; padding: 24px 0; }

/* ---------- 购买步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: s; }
.step { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.step .n { width: 28px; height: 28px; border-radius: 50%; background: var(--brand); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 14px; margin-bottom: 10px; }
.step h4 { margin: 0 0 6px; font-size: 15px; }
.step p { margin: 0; color: var(--muted); font-size: 13px; }

/* ---------- 详情页 ---------- */
.detail { display: grid; grid-template-columns: 340px 1fr; gap: 30px; align-items: start; }
.detail .cover { border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: #f2f6fc; }
.detail .cover img { width: 100%; }
.detail h1 { margin: 0 0 10px; font-size: 26px; }
.detail .intro { color: #46505f; font-size: 15px; margin: 0 0 16px; }
.detail .meta { color: var(--muted); font-size: 13.5px; margin-bottom: 20px; }
.pkg-title { font-size: 15px; font-weight: 600; margin: 0 0 12px; }
.pkgs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.pkg { border: 1.5px solid var(--line); border-radius: 10px; padding: 14px 16px; cursor: pointer; transition: .15s; background: #fff; }
.pkg:hover { border-color: #b9d2fb; }
.pkg.active { border-color: var(--brand); box-shadow: 0 0 0 3px #e6f0ff; }
.pkg .pn { font-size: 14px; color: #3a4658; }
.pkg .pp { color: var(--price); font-weight: 700; font-size: 20px; margin-top: 4px; }
.pkg .pp small { font-size: 12px; color: var(--muted); font-weight: 400; }
.buy-bar { margin-top: 24px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.buy-bar .hint { color: var(--muted); font-size: 13px; }

/* ---------- 订单确认 / 支付 ---------- */
.checkout { margin-top: 24px; border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; background: #fbfcfe; max-width: 460px; }
.checkout .co-title { font-size: 15px; font-weight: 600; margin: 0 0 12px; }
.checkout .co-row { display: flex; justify-content: space-between; gap: 12px; font-size: 14px; padding: 7px 0; border-bottom: 1px dashed #eef1f6; }
.checkout .co-row:last-of-type { border-bottom: 0; }
.checkout .co-row span { color: var(--muted); }
.checkout .co-price { color: var(--price); font-size: 20px; }
.checkout .co-buy { margin-top: 14px; width: 100%; }
.checkout .co-note { color: var(--muted); font-size: 12.5px; margin: 12px 0 0; }

/* ---------- 关于/条款 ---------- */
.prose { max-width: 860px; }
.prose h2 { font-size: 20px; margin: 30px 0 10px; }
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { color: #414b5a; font-size: 14.5px; }
.prose ol { padding-left: 22px; }
.notice { background: #fff7ed; border: 1px solid #ffe0b8; color: #8a5a12; border-radius: 10px; padding: 14px 16px; font-size: 13.5px; margin: 18px 0; }

/* ---------- 页脚 ---------- */
.footer { background: #101826; color: #aeb9c9; padding: 40px 0 30px; margin-top: 10px; font-size: 13.5px; }
.footer .cols { display: flex; flex-wrap: wrap; gap: 40px; justify-content: space-between; }
.footer h4 { color: #fff; font-size: 14px; margin: 0 0 10px; }
.footer a:hover { color: #fff; }
.footer .links { display: flex; flex-direction: column; gap: 7px; }
.footer .copy { margin-top: 26px; padding-top: 18px; border-top: 1px solid #223047; color: #7d8aa0; font-size: 12.5px; display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; }
.footer .copy a { color: #9fb0c8; }

@media (max-width: 900px) {
  .feats, .products, .steps, .pkgs { grid-template-columns: 1fr 1fr; }
  .detail { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  .feats, .products, .steps, .pkgs { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
}