:root {
  --ink: #18181a;
  --sub: #55555c;
  --line: #e6e6ea;
  --bg: #ffffff;
  --soft: #f7f7f8;
  --accent: #ffb319;
  --blue: #2a74db;
  --head: "Avenir Next", "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --body: Helvetica, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--body); overflow-x: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
h1, h2, h3 { font-family: var(--head); font-weight: 700; letter-spacing: -.01em; margin: 0; line-height: 1.2; }
.wrap { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 16px; }

/* 顶栏 */
.top { position: sticky; top: 0; z-index: 20; background: rgba(255, 255, 255, .92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; gap: 18px; height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; font-family: var(--head); font-weight: 700; font-size: 17px; }
.brand img { width: 26px; height: 26px; border-radius: 6px; }
.nav { display: flex; gap: 18px; margin-left: 8px; color: var(--sub); font-size: 15px; }
.nav a:hover { color: var(--ink); }
.spacer { flex: 1; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 40px; padding: 0 18px; border: 0; border-radius: 10px; background: var(--ink); color: #fff; font-weight: 600; }
.btn:hover { opacity: .88; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn.big { height: 46px; padding: 0 24px; font-size: 17px; }
.cart { display: inline-flex; align-items: center; gap: 6px; height: 36px; padding: 0 14px; border: 1px solid var(--line); border-radius: 999px; font-size: 14px; }
.cart-n { min-width: 18px; height: 18px; padding: 0 5px; border-radius: 999px; background: var(--accent); color: #3a2a00; font-size: 12px; line-height: 18px; text-align: center; font-weight: 700; }

/* 首屏 */
.hero { padding: 52px 0 30px; }
.hero h1 { font-size: 38px; }
.hero p { margin: 14px 0 0; max-width: 620px; color: var(--sub); font-size: 17px; }
.hero .row { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.wall { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.wall span { padding: 7px 13px; border: 1px solid var(--line); border-radius: 999px; background: var(--soft); font-size: 14px; color: var(--sub); }

/* 分组条 */
section.band { padding: 30px 0; }
section.band > .wrap > h2 { font-size: 23px; margin-bottom: 4px; }
.note { margin: 0 0 18px; color: var(--sub); font-size: 14px; }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.pc { display: block; padding: 16px; border: 1px solid var(--line); border-radius: 14px; background: #fff; transition: .16s; }
.pc:hover { border-color: var(--ink); transform: translateY(-2px); }
.pc h3 { font-size: 16px; line-height: 1.35; }
.pc .sub { margin: 6px 0 0; color: var(--sub); font-size: 13px; height: 38px; overflow: hidden; }
.pc .price { margin-top: 10px; font-family: var(--head); font-weight: 700; font-size: 21px; }
.pc .price i { font-style: normal; font-size: 13px; margin-right: 2px; color: var(--sub); }
.pc .stk { margin-top: 4px; color: var(--sub); font-size: 12px; }
.pc.out { opacity: .55; }
.pc.out .price { color: var(--sub); }

/* 流程 / 说明 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.step { padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--soft); }
.step b { display: block; font-family: var(--head); font-size: 15px; margin-bottom: 6px; }
.step span { color: var(--sub); font-size: 14px; }

/* 站长说 */
.owner { display: flex; gap: 16px; padding: 22px; border: 1px solid var(--line); border-radius: 16px; }
.owner img { width: 56px; height: 56px; border-radius: 50%; flex: none; }
.owner p { margin: 0; color: var(--sub); }

/* 商品详情 */
.pd { display: grid; grid-template-columns: 1fr 320px; gap: 26px; padding: 26px 0 40px; }
.bc h1 { font-size: 30px; }
.crumb { margin: 0 0 14px; color: var(--sub); font-size: 14px; }
.ph { display: flex; align-items: center; gap: 14px; }
.ph img { width: 72px; height: 72px; border-radius: 16px; object-fit: contain; background: var(--soft); border: 1px solid var(--line); flex: none; }
.kicker { margin: 0 0 4px; color: var(--sub); font-size: 14px; }
.pics { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 18px 0; }
.pics img { width: 100%; border-radius: 12px; border: 1px solid var(--line); }
.detail { margin-top: 22px; }
.detail img { margin: 10px 0; border-radius: 12px; }
.detail h2, .detail h3 { margin: 18px 0 8px; font-size: 19px; }
.detail ul, .detail ol { padding-left: 22px; }
.pd-buy { position: sticky; top: 76px; align-self: start; padding: 22px 20px; border: 1px solid var(--line); border-top: 4px solid var(--accent); border-radius: 16px; text-align: center; }
.pd-buy .price { font-family: var(--head); font-weight: 700; font-size: 34px; }
.c-note { margin: 2px 0 14px; color: var(--sub); font-size: 14px; }
.qty { display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 14px; }
.qty button { width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 9px; background: #fff; font-size: 18px; }
.qty output { min-width: 34px; text-align: center; font-weight: 700; }
.pd-buy .btn { width: 100%; border-radius: 999px; }
.link { display: block; width: 100%; margin-top: 10px; padding: 12px 0 0; border: 0; background: transparent; color: var(--blue); font-size: 15px; text-decoration: underline; }
.bc-assure { margin: 16px 0 0; padding: 14px 0 0; border-top: 1px dashed var(--line); list-style: none; text-align: left; }
.bc-assure li { margin: 6px 0; color: var(--sub); font-size: 13px; }
.bc-assure li::before { content: "\2713"; color: var(--blue); margin-right: 7px; }

/* 页脚 */
.foot { padding: 30px 0 46px; border-top: 1px solid var(--line); background: var(--soft); color: var(--sub); font-size: 14px; }
.foot .row { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 10px; }
.toast { position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%); padding: 11px 18px; border-radius: 10px; background: var(--ink); color: #fff; font-size: 14px; opacity: 0; transition: .2s; pointer-events: none; z-index: 40; }
.toast.on { opacity: 1; }
.hide-m { display: initial; }

@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .pd { grid-template-columns: 1fr; }
  .pd-buy { position: static; order: -1; }
  .steps { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
  .nav, .hide-m { display: none; }
  .hero { padding: 32px 0 20px; }
}