:root {
  --bg: #fdfcfa;
  --bg-soft: #f4f1ea;
  --ink: #1c1a17;
  --ink-2: #4d4a44;
  --ink-3: #7a756c;
  --line: #e5e1d6;
  --accent: #0f6e56;
  --accent-soft: #e4f3ec;
  --warn: #8a4f12;
  --warn-soft: #f8eddb;
  --radius: 12px;
  --max: 780px;
  --wide: 1080px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  /* 细噪点纹理：给没有照片的缩略图一点纸面质感，纯 CSS，不请求任何图片 */
  --noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.085'/%3E%3C/svg%3E");
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.wide { max-width: var(--wide); margin: 0 auto; padding: 0 20px; }

/* header */
.site-head {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-head .wide {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 60px;
}
.logo {
  font-weight: 600;
  font-size: 16px;
  color: var(--ink);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.logo:hover { text-decoration: none; }
.nav { display: flex; gap: 20px; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { font-size: 14px; color: var(--ink-2); white-space: nowrap; }
.nav a:hover { color: var(--ink); text-decoration: none; }

/* disclosure bar */
.disclosure-bar {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-3);
  padding: 8px 0;
}

/* hero */
.hero { padding: 56px 0 40px; border-bottom: 1px solid var(--line); }
.hero h1 {
  font-family: var(--serif);
  font-size: 39px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  font-weight: 500;
  max-width: 640px;
}
.hero p { font-size: 17px; color: var(--ink-2); margin: 0; max-width: 600px; }

/* section */
.section { padding: 44px 0; border-bottom: 1px solid var(--line); }
.section:last-child { border-bottom: 0; }
.section h2 {
  font-family: var(--serif);
  font-size: 24px;
  letter-spacing: -0.005em;
  margin: 0 0 6px;
  font-weight: 500;
}
.section .sub { color: var(--ink-3); font-size: 15px; margin: 0 0 24px; }

/* product grid：auto-fit 让条目少的分类（2 个）把卡片撑开，不留一排空洞 */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  transition: border-color .15s;
}
.card:hover { border-color: #c9c6bc; }
/* 缩略带用固定高度而不是 aspect-ratio：两张卡并排时 aspect-ratio 会把带子
   撑到 300px 高，图案缩在里面像一张加载失败的图。固定高度让图案始终占
   带子的一半以上，看起来是有意为之的标记，而不是缺图。 */
.card .thumb {
  height: 128px;
  background-color: var(--bg-soft);
  background-image: var(--noise);
  background-size: 160px 160px;
  display: grid;
  place-items: center;
  color: #a9a294;
}
/* 高度定死、宽度按比例走，并限一个上限：扁的图形（震动器）不会缩成一条线，
   竖的图形（润滑液滴）也不会顶穿缩略带。 */
.card .thumb .thumb-mark { height: 76px; width: auto; max-width: 156px; }
.card .body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.card .kicker { font-size: 12px; color: var(--ink-3); text-transform: uppercase; letter-spacing: .06em; }
.card .name { font-size: 15px; font-weight: 600; line-height: 1.4; color: var(--ink); margin: 0; }
.card .price { font-size: 15px; font-weight: 600; margin-top: auto; padding-top: 8px; }
.card .price s { color: var(--ink-3); font-weight: 400; margin-left: 6px; font-size: 13px; }
.card .card-sub { font-size: 13px; color: var(--ink-3); line-height: 1.5; margin: 0; }

/* product page */
.crumbs { font-size: 13px; color: var(--ink-3); padding: 20px 0 0; }
.crumbs a { color: var(--ink-3); }
h1.title {
  font-family: var(--serif);
  font-size: 34px;
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 12px 0 10px;
  font-weight: 500;
}
.meta { font-size: 13px; color: var(--ink-3); display: flex; gap: 16px; flex-wrap: wrap; }
.standfirst { font-size: 18px; line-height: 1.6; color: var(--ink-2); margin: 0 0 14px; max-width: 64ch; }
.cat-detail { font-size: 16px; line-height: 1.7; color: var(--ink-2); margin: 0 0 30px; max-width: 64ch; }

.verdict {
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 26px 0;
}
.verdict .label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 8px;
}
.verdict p { margin: 0; font-size: 16px; color: #0b3d31; }

.buybox {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.buybox .outlabel { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin-bottom: 6px; }
.buybox .price-lg { font-size: 26px; font-weight: 600; letter-spacing: -0.02em; }
.buybox .price-lg s { font-size: 15px; color: var(--ink-3); font-weight: 400; margin-left: 8px; }
.buybox .fineprint { font-size: 12px; color: var(--ink-3); margin-top: 4px; max-width: 300px; line-height: 1.5; }

.btn {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  padding: 12px 22px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
}
.btn:hover { background: #000; text-decoration: none; }
.btn-sm { padding: 9px 16px; font-size: 14px; }

.proscons { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 28px 0; }
.pc { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.pc h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .07em; margin: 0 0 12px; font-weight: 600; }
.pc.good h3 { color: var(--accent); }
.pc.bad h3 { color: var(--warn); }
.pc ul { margin: 0; padding-left: 18px; }
.pc li { font-size: 15px; margin-bottom: 8px; color: var(--ink-2); }
.pc li:last-child { margin-bottom: 0; }

table.specs { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 15px; }
table.specs th, table.specs td { text-align: left; padding: 11px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
table.specs th { width: 38%; color: var(--ink-3); font-weight: 400; }
table.specs td { color: var(--ink); }

.body-copy h2 { font-family: var(--serif); font-size: 24px; margin: 38px 0 12px; font-weight: 500; letter-spacing: -0.005em; }
.body-copy p { margin: 0 0 16px; color: var(--ink-2); }

/* 示意图：不依赖商品照，讲的是原理 */
.fig { margin: 32px 0 12px; }
.fig-canvas { background: var(--bg-soft); border-radius: var(--radius); padding: 26px 22px; }
.fig-canvas svg { width: 100%; height: auto; display: block; }
.fig figcaption { font-size: 13px; color: var(--ink-3); margin-top: 10px; line-height: 1.55; max-width: 62ch; }

.faq { margin: 32px 0; }
.faq details { border-bottom: 1px solid var(--line); padding: 14px 0; }
.faq summary { cursor: pointer; font-weight: 500; font-size: 16px; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+"; display: inline-block; width: 18px; color: var(--ink-3); }
.faq details[open] summary::before { content: "–"; }
.faq p { margin: 10px 0 0 18px; color: var(--ink-2); font-size: 15px; }

/* compare table */
table.cmp { width: 100%; border-collapse: collapse; font-size: 14px; margin: 24px 0; }
table.cmp th, table.cmp td { padding: 12px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
table.cmp thead th { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); font-weight: 600; border-bottom: 1px solid var(--ink); }
table.cmp td:first-child { color: var(--ink-3); width: 30%; }

/* footer */
.site-foot { border-top: 1px solid var(--line); padding: 36px 0 48px; font-size: 13px; color: var(--ink-3); }
.site-foot .cols { display: grid; grid-template-columns: 2fr 1fr; gap: 32px; }
.site-foot h4 { font-size: 13px; color: var(--ink-2); margin: 0 0 10px; font-weight: 600; }
.site-foot a { color: var(--ink-2); display: block; margin-bottom: 6px; }
.site-foot .legal { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); line-height: 1.7; }

/* demo banner */
.demo-banner {
  background: var(--warn-soft);
  color: var(--warn);
  font-size: 13px;
  padding: 8px 0;
  text-align: center;
  border-bottom: 1px solid #f0d9ae;
}

/* age gate */
.gate {
  position: fixed; inset: 0; background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  padding: 24px; z-index: 100;
}
.gate[hidden] { display: none; }
.gate-box { max-width: 420px; text-align: center; }
.gate-box h1 { font-size: 24px; margin: 0 0 12px; font-weight: 600; }
.gate-box p { color: var(--ink-2); font-size: 15px; margin: 0 0 24px; }
.gate-actions { display: flex; gap: 12px; justify-content: center; }

/* feed list */
.feedlist { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.feedlist li {
  display: flex; justify-content: space-between; gap: 16px;
  padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 15px;
}
.feedlist a { color: var(--ink); }
.feedlist .fprice { color: var(--ink-2); white-space: nowrap; font-variant-numeric: tabular-nums; }

/* 只有一张卡片时不要拉满整行：auto-fit 会把单条目撑到整行宽，
   一张 1000px 宽的卡配两行摘要很难看。多个条目时照常铺开。 */
.grid > :only-child { max-width: 460px; margin-inline: auto; }

/* unavailable state */
.unavailable {
  background: var(--warn-soft);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--warn);
}
.unavailable strong { display: block; margin-bottom: 4px; color: #633806; }
.unavailable a { color: var(--warn); text-decoration: underline; }

/* sticky mobile CTA */
.mobile-cta { display: none; }
.mobile-cta-spacer { display: none; }

/* horizontally scrollable tables on small screens */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-scroll table.cmp { min-width: 560px; }

@media (max-width: 640px) {
  .mobile-cta {
    display: flex;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 16px calc(10px + env(safe-area-inset-bottom, 0px));
    background: rgba(255, 255, 255, 0.97);
    border-top: 1px solid var(--line);
    z-index: 30;
  }
  .mobile-cta .p { font-size: 16px; font-weight: 600; line-height: 1.2; }
  .mobile-cta .p small { display: block; font-size: 11px; font-weight: 400; color: var(--ink-3); margin-top: 2px; }
  .mobile-cta .btn { flex: 1; padding: 13px 22px; min-height: 46px; display: inline-flex; align-items: center; justify-content: center; }
  .mobile-cta-spacer { display: block; height: 76px; }

  /* tap targets */
  .nav a { padding: 8px 0; min-height: 40px; display: inline-flex; align-items: center; }
  .site-foot a { padding: 6px 0; }
  .faq summary { padding: 4px 0; min-height: 44px; display: flex; align-items: center; }
  .faq summary::before { margin-right: 4px; }

  body { font-size: 16px; }
  .hero { padding: 36px 0 28px; }
  .hero h1, h1.title { font-size: 26px; }
  .proscons { grid-template-columns: 1fr; }
  .site-foot .cols { grid-template-columns: 1fr; }
  .nav { gap: 14px; }
  table.cmp { font-size: 13px; }
  table.cmp th, table.cmp td { padding: 10px 6px; }
  .buybox { flex-direction: column; align-items: flex-start; }
  .buybox .btn { width: 100%; text-align: center; }
}