*{box-sizing:border-box}
:root{
  --ink:#33261b;--sub:#7a6a58;--ter:#9c8e7d;--line:#e6ddd0;--line-soft:#efe9df;
  --bg:#faf8f4;--bg-alt:#fffdfa;--blue:#3a2a1e;--blue-h:#4c382a;--radius:10px;
  --paper:#f2ece2;--onaccent:#faf6ef;
}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro SC","SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:17px;line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:#8a6a48;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
::selection{background:rgba(200,150,90,.3)}

/* 吸顶磨砂导航 */
header.top{position:sticky;top:0;z-index:999;height:48px;background:rgba(250,248,244,.82);
  -webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid rgba(58,42,30,.10)}
header.top .wrap{height:48px;display:flex;align-items:center;justify-content:space-between;gap:16px}
header.top .brand{font-size:16px;font-weight:600;color:var(--ink);letter-spacing:-.01em;white-space:nowrap}
header.top .links{display:flex;gap:24px}
header.top .links a{font-size:13px;color:var(--ink);opacity:.8}
header.top .links a:hover{text-decoration:none;opacity:1}

/* 容器与排版 */
.wrap{max-width:1024px;margin:0 auto;padding:0 22px}
.crumb{font-size:12px;color:var(--ter);padding:22px 0 0}
.crumb a{color:var(--ter)}
h1{font-size:clamp(31px,4.2vw,52px);line-height:1.12;font-weight:600;letter-spacing:-.015em;margin:16px 0 14px;text-wrap:balance}
.meta{font-size:15px;color:var(--sub);margin:0 0 20px}
.lead{font-size:clamp(17px,1.9vw,20px);line-height:1.5;color:var(--sub);
  border:0;background:none;padding:0;margin:0 0 56px;max-width:820px}
.lead strong{color:var(--ink);font-weight:600}
h2{color:var(--ink);font-size:clamp(23px,2.8vw,32px);line-height:1.18;font-weight:600;letter-spacing:-.01em;
  margin:70px 0 18px;padding:0;border:0}
h3{font-size:19px;font-weight:600;letter-spacing:-.01em;margin:30px 0 8px}

/* 苹果式发丝线表格 */
.tablewrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 0 14px}
.tablewrap table{margin:0}
table{width:100%;border-collapse:collapse;margin:0 0 14px;font-size:15px}
th,td{padding:16px 0;border:0;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;line-height:1.45}
tr:first-child>th,tr:first-child>td{border-top:1px solid var(--line)}
th{font-weight:400;color:var(--sub);padding-right:24px}
tbody th{width:32%}
td{padding-right:20px}
td:last-child,th:last-child{padding-right:0}
td.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.note{font-size:13px;color:var(--ter);margin:10px 0 0;line-height:1.6}

/* 卡片 */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(272px,1fr));gap:18px;margin:24px 0}
.card{background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius);padding:0;overflow:hidden;
  display:flex;flex-direction:column;transition:border-color .25s ease,background .25s ease}
.card:hover{border-color:#cfbda5;background:#fffefb}
.card .thumb{aspect-ratio:4/3;background:var(--paper);overflow:hidden;display:flex;align-items:center;justify-content:center}
.card .thumb.empty{background:#e9e1d4}
.card .thumb img{width:100%;height:100%;object-fit:contain;transition:transform .5s cubic-bezier(.4,0,.2,1)}
.card:hover .thumb img{transform:scale(1.04)}
.card .body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:3px;flex:1}
.card .n{font-size:17px;font-weight:600;letter-spacing:-.01em;color:var(--ink);line-height:1.3}
.card .s{font-size:13px;color:var(--sub);line-height:1.45}
.card .p{font-size:16px;color:var(--ink);font-weight:500;margin-top:auto;padding-top:14px;font-variant-numeric:tabular-nums}
.card a.s{color:var(--blue);font-size:13px;margin-top:2px}

/* 问答：发丝线分隔 */
dl.faq{margin:0}
dl.faq dt{font-size:17px;font-weight:600;padding:20px 0 10px;border-top:1px solid var(--line)}
dl.faq dd{margin:0;padding:0 0 20px;color:#5c4d3f;font-size:16px;line-height:1.55}

/* 按钮 */
.btn{display:inline-block;background:var(--blue);color:var(--onaccent)!important;border-radius:6px;
  padding:12px 26px;font-size:15px;font-weight:600;letter-spacing:.02em;margin:8px 10px 8px 0;
  transition:background .2s;white-space:nowrap}
.btn:hover{background:var(--blue-h);text-decoration:none}

img.hero{width:auto;max-width:100%;max-height:560px;object-fit:contain;background:var(--paper);
  border-radius:4px;padding:34px;margin:6px auto 44px;border:1px solid var(--line)}

.toc{font-size:15px;margin:30px 0;line-height:2}
.toc a{margin-right:20px;color:var(--blue)}

ul,ol{padding-left:22px}
li{margin:8px 0;line-height:1.55}
p{margin:14px 0}

.fill{background:#f7e9e6;color:#a4563f;padding:1px 6px;border-radius:6px;font-size:14px}

footer{margin-top:84px;background:#f2ece2;color:var(--ter);font-size:12px;padding:48px 0 40px;border-top:1px solid var(--line)}
footer .wrap{max-width:1024px}
footer a{color:var(--sub)}
.footgrid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:32px;margin-bottom:28px;line-height:2}
.footgrid strong{color:var(--ink);font-weight:600;font-size:13px}
.footgrid a{display:block}
.legal{border-top:1px solid var(--line);padding-top:20px;color:var(--ter);line-height:1.7}

/* ---------- 动效（渐进增强，无 JS 时不影响可见性） ---------- */
header.top{transition:box-shadow .3s ease,background .3s ease}
header.top.scrolled{box-shadow:0 1px 14px rgba(0,0,0,.07)}
a{transition:color .2s ease,opacity .2s ease}
.btn{transition:background .25s ease,transform .18s ease}
.btn:active{transform:scale(.97)}
.card{will-change:transform}

@media(prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}

  /* 首屏：标题、副标题、导语依次上浮（纯 CSS，不依赖 JS） */
  h1{animation:riseIn .85s cubic-bezier(.22,1,.36,1) both}
  .meta{animation:riseIn .85s .07s cubic-bezier(.22,1,.36,1) both}
  .lead{animation:riseIn .95s .15s cubic-bezier(.22,1,.36,1) both}

  /* 滚动进场 */
  .js .rv{opacity:0;transform:translateY(22px);
    transition:opacity .75s cubic-bezier(.22,1,.36,1),transform .75s cubic-bezier(.22,1,.36,1);
    transition-delay:var(--d,0ms)}
  .js .rv.in{opacity:1;transform:none}

  /* 产品大图：进场时轻微推近 */
  .js img.hero{transform:scale(1.015);transition:opacity .9s ease,transform 1.1s cubic-bezier(.22,1,.36,1)}
  .js img.hero.in{transform:scale(1)}
}

@keyframes riseIn{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}

@media(max-width:734px){
  body{font-size:16px}
  .wrap{padding:0 16px}
  h1{font-size:33px;line-height:1.1}
  h2{font-size:23px;margin-top:52px}
  .lead{margin-bottom:40px}
  th,td{padding:13px 10px 13px 0;font-size:14px}
  th{width:34%;padding-right:14px}
  .tablewrap{margin-left:-16px;margin-right:-16px;padding:0 16px}
  .tablewrap table{min-width:520px}
  .grid{grid-template-columns:1fr}
  .footgrid{grid-template-columns:1fr;gap:18px}
  img.hero{padding:18px;border-radius:16px}
  header.top .links{gap:14px}
  header.top .links a{font-size:12px}
}
@media(max-width:420px){
  header.top .links a:nth-child(3){display:none}
}