/* ============================================================================
   简栈电子 · 品牌主站（oink.tech）
   ----------------------------------------------------------------------------
   设计语言与产品站（site/styles.css）同一套纸页：一种纸、一种墨、一种赭色；
   宋体标题 + 无衬线正文 + 等宽元信息；发丝线、方角 2px、顶部 2px 赭色规矩线。
   颜色**只取自产品站已有的 token**，不新增色值。
   本页不加载任何外部资源：无统计、无 CDN、无字体外链、无第三方图片。
   ============================================================================ */

:root{
  color-scheme: light;

  --desk:#12100C;
  --desk-2:#17130D;

  --paper:#FAF7F0;
  --paper-2:#F4EFE4;
  --paper-3:#EDE7DA;
  --ink:#211E18;
  --body:#4A443A;
  --muted:#7C7466;
  --faint:#A69D8C;
  --line:#E2DACA;
  --line-2:#EDE7DA;
  --ochre:#9A6B3F;
  --ochre-2:#7A4F2A;
  --ochre-soft:#F3E9DA;
  --ochre-line:#D9C4A6;
  --btn:#2B2419;
  --btn-ink:#F4EEDF;
  --ok:#5F7350;

  --shadow-sheet:0 34px 90px rgba(0,0,0,.55), 0 0 0 1px rgba(255,255,255,.04);

  --serif:"Songti SC","STSong","SimSun","Noto Serif CJK SC","Noto Serif SC",serif;
  --sans:"Microsoft YaHei UI","Microsoft YaHei","PingFang SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --mono:Consolas,"Cascadia Mono",SFMono-Regular,Menlo,"Liberation Mono",monospace;

  --w:1060px;
  --pad:56px;
}

html[data-theme="dark"]{
  color-scheme: dark;
  --desk:#0B0906;
  --desk-2:#100D09;

  --paper:#1C1A16;
  --paper-2:#24211B;
  --paper-3:#2E2A22;
  --ink:#F2ECDF;
  --body:#CFC5B2;
  --muted:#9B9282;
  --faint:#857C6B;
  --line:#3A352C;
  --line-2:#2E2A22;
  --ochre:#C79A6B;
  --ochre-2:#D3A374;
  --ochre-soft:#2A2419;
  --ochre-line:#5A4A36;
  --btn:#F2ECDF;
  --btn-ink:#1A1712;
  --ok:#A3B58E;

  --shadow-sheet:0 34px 90px rgba(0,0,0,.72), 0 0 0 1px rgba(255,255,255,.05);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:24px}
body{
  margin:0;
  padding:34px 20px 48px;
  color:var(--body);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  background:
    radial-gradient(900px 520px at 12% -2%, #241D14 0%, transparent 62%),
    radial-gradient(760px 480px at 92% 4%, #1C1810 0%, transparent 58%),
    linear-gradient(160deg,var(--desk-2) 0%,var(--desk) 52%,#0A0806 100%);
  background-attachment:fixed;
}
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.022) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(80% 70% at 50% 40%,#000 0%,transparent 100%);
  -webkit-mask-image:radial-gradient(80% 70% at 50% 40%,#000 0%,transparent 100%);
}

h1,h2,h3,h4{font-family:var(--serif);font-weight:700;color:var(--ink);margin:0;letter-spacing:.02em}
p{margin:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* ---------- 那张纸 ---------- */
.sheet{
  position:relative;
  z-index:1;
  max-width:var(--w);
  margin:0 auto;
  background:var(--paper);
  border-radius:2px;
  box-shadow:var(--shadow-sheet);
  overflow:hidden;
}
.sheet::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--ochre);z-index:2;
}

/* ---------- 图标 ---------- */
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.arw{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;vertical-align:-2px}

/* ---------- 页头 ---------- */
.head{border-bottom:1px solid var(--line)}
.head-in{
  display:flex;align-items:center;gap:20px;
  padding:17px var(--pad);
}
.brand{display:flex;align-items:center;gap:11px}
.mark{
  width:34px;height:34px;flex:none;display:grid;place-items:center;
  border:1px solid var(--ochre-line);border-radius:2px;
  background:var(--paper-2);color:var(--ochre);
}
.brand-name{
  display:block;font-family:var(--serif);font-size:19px;line-height:1.25;
  color:var(--ink);letter-spacing:.08em;
}
.brand-sub{
  display:block;font-family:var(--mono);font-size:9.5px;line-height:1.4;
  color:var(--faint);letter-spacing:.2em;
}
.nav{display:flex;gap:24px;margin-left:auto}
.nav a{font-size:13px;color:var(--muted);transition:color .15s}
.nav a:hover{color:var(--ochre)}
.theme-toggle{
  width:32px;height:32px;flex:none;display:grid;place-items:center;
  border:1px solid var(--line);border-radius:2px;
  background:var(--paper);color:var(--muted);
  transition:color .15s,border-color .15s;
}
.theme-toggle:hover{color:var(--ochre);border-color:var(--ochre-line)}
.theme-toggle svg{
  width:16px;height:16px;grid-area:1/1;
  fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;
}
html[data-theme="light"] .theme-toggle .i-moon{display:none}
html[data-theme="dark"] .theme-toggle .i-sun{display:none}

/* ---------- 封面 ---------- */
.hero{padding:64px var(--pad) 54px;border-bottom:1px solid var(--line)}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  color:var(--muted);text-transform:uppercase;
}
.dot{width:5px;height:5px;border-radius:50%;background:var(--ochre);flex:none}
.hero h1{margin-top:20px;font-size:46px;line-height:1.24;letter-spacing:.015em}
.hero h1 em{font-style:normal;color:var(--ochre)}
.lede{margin-top:22px;font-size:17px;line-height:2;color:var(--body)}
.who{margin-top:16px;font-size:13px;color:var(--muted)}

/* ---------- 分段标题 ---------- */
.sec-head{display:flex;align-items:baseline;gap:14px;margin-bottom:24px}
.sec-no{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--ochre);flex:none}
.sec-head h2{font-size:22px;letter-spacing:.05em;flex:none}
.sec-line{flex:1;height:1px;background:var(--line);transform:translateY(-4px)}

/* ---------- 产品 ---------- */
.products{padding:52px var(--pad);border-bottom:1px solid var(--line)}
.card{
  border:1px solid var(--line);border-radius:2px;
  background:var(--paper-2);
  padding:26px 28px;
}
.card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;flex-wrap:wrap}
.card-title{display:flex;align-items:center;gap:10px}
.card-title h3{font-size:24px;letter-spacing:.06em}
.mark-sm{width:24px;height:24px;flex:none;display:grid;place-items:center;color:var(--ochre)}
.mark-sm .icon{width:22px;height:22px}
.tag{
  font-size:9.5px;letter-spacing:.1em;color:var(--muted);
  border:1px solid var(--line);border-radius:1px;padding:1px 6px;
  background:var(--paper);
}
.card-meta{font-size:11px;letter-spacing:.04em;color:var(--muted);padding-top:6px}
.card-desc{margin-top:18px;max-width:72ch;font-size:14px;line-height:1.95}
.card-points{list-style:none;display:flex;flex-wrap:wrap;gap:8px 22px;margin:18px 0 0;padding:0}
.card-points li{font-size:12px;color:var(--muted)}
.card-points li::before{
  content:"";display:inline-block;width:5px;height:5px;border-radius:50%;
  background:var(--ochre);margin-right:8px;vertical-align:2px;
}
.card-foot{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:24px;padding-top:18px;border-top:1px solid var(--line);
}
.price{font-size:12px;color:var(--body);letter-spacing:.03em}
.btn{
  display:inline-flex;align-items:center;gap:7px;
  background:var(--btn);color:var(--btn-ink);
  font-size:13px;letter-spacing:.05em;
  padding:10px 18px;border-radius:2px;
  transition:background .15s,color .15s;
}
.btn:hover{background:var(--ochre);color:var(--btn-ink)}
.btn:hover .arw{transform:translateX(2px)}
.btn .arw{transition:transform .15s}
.later{margin-top:16px;font-size:12px;color:var(--faint);letter-spacing:.02em}

/* ---------- 页脚 ---------- */
.foot{padding:36px var(--pad) 24px;background:var(--paper-2)}
.foot-head{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.foot-brand{display:flex;align-items:center;gap:9px;flex:none}
.foot-name{font-family:var(--serif);font-size:16px;color:var(--ink);letter-spacing:.06em}
.foot-about{font-size:12.5px;line-height:1.8;color:var(--muted)}
.foot-bottom{
  display:flex;align-items:center;flex-wrap:wrap;gap:6px 14px;
  margin-top:20px;padding-top:14px;border-top:1px solid var(--line);
  font-size:11px;line-height:1.9;color:var(--faint);
}
.foot-bottom a{color:var(--muted);transition:color .15s}
.foot-bottom a:hover{color:var(--ochre)}
.icp-line{text-decoration:underline;text-underline-offset:3px}
.foot-links{display:inline-flex;align-items:center}
.foot-links a + a::before{content:"·";margin:0 8px;color:var(--line)}

/* ---------- 窄屏 ---------- */
@media (max-width:860px){
  :root{--pad:22px}
  body{padding:0}
  .sheet{border-radius:0;box-shadow:none}
  .nav{display:none}
  .hero{padding:46px var(--pad) 38px}
  .hero h1{font-size:34px}
  .lede{font-size:15.5px}
  .products{padding:40px var(--pad)}
  .card{padding:22px 20px}
  .foot{padding:30px var(--pad) 20px}
  .foot-about{font-size:12px}
  .foot-bottom{gap:6px 12px}
}
@media (max-width:520px){
  .hero h1{font-size:29px}
  .foot-head{display:block}
  .foot-about{margin-top:10px}
  .card-foot{flex-direction:column;align-items:flex-start}
  .btn{width:100%;justify-content:center}
}