/* =========================================================
   李森 · 个人主页 — 工程图纸风
   Design tokens + layout. No external dependencies.
   ========================================================= */

:root{
  --paper:#F2EFE6;
  --paper2:#EAE6DA;
  --ink:#12293C;
  --ink2:#3C5670;
  --dim:#6E7C8A;
  --rule:rgba(18,41,60,.20);
  --rule2:rgba(18,41,60,.10);
  --red:#BE3A28;

  --mono:"Cascadia Mono","Consolas","SFMono-Regular",ui-monospace,monospace;
  --sans:"Microsoft YaHei UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB",system-ui,sans-serif;

  --wrap:1180px;
  --pad:24px;
}

*{box-sizing:border-box;margin:0;padding:0}

html{
  background:var(--paper);
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  font-size:14.5px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  background-image:
    repeating-linear-gradient(0deg, rgba(18,41,60,.055) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(90deg, rgba(18,41,60,.055) 0 1px, transparent 1px 26px);
}

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

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--pad)}

.mono{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase}
.red{color:var(--red)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:20;
  border-bottom:2px solid var(--ink);
  background:rgba(242,239,230,.92);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.bar{display:flex;align-items:center;gap:16px;height:62px}
.bar .brand{display:flex;align-items:center;gap:11px;text-decoration:none}
.bar .brand img{height:24px;width:auto}
.bar .id{font-size:14px;font-weight:700;letter-spacing:.02em}
.bar .id em{font-style:normal;font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--dim);margin-left:10px}
.bar nav{margin-left:auto;display:flex;gap:2px;align-items:center}
.bar nav a{
  font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--dim);
  text-decoration:none;padding:7px 10px;transition:.16s;white-space:nowrap;
}
.bar nav a:hover{color:var(--ink)}
.bar nav a.is-active{color:var(--red)}

/* ---------- section scaffolding ---------- */
section{padding-bottom:54px;scroll-margin-top:74px}

.shead{
  display:flex;align-items:baseline;gap:14px;
  border-bottom:1px solid var(--rule);
  padding-bottom:10px;margin:0 0 26px;
}
.shead .code{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--red)}
.shead h2{font-size:22px;font-weight:800;letter-spacing:.02em}
.shead .en{font-family:var(--mono);font-size:10px;letter-spacing:.24em;color:var(--dim)}
.shead .r{margin-left:auto;font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--ink2);text-align:right}

/* ---------- hero ---------- */
.hero{
  display:grid;grid-template-columns:1fr 336px;gap:56px;
  padding:56px 0 52px;align-items:start;
}
.kicker{display:flex;align-items:center;gap:12px;margin-bottom:22px;color:var(--dim)}
.kicker .ln{width:34px;height:1px;background:var(--ink);flex:0 0 34px}
h1{font-size:96px;line-height:.92;font-weight:800;letter-spacing:-.045em;margin-bottom:12px}
h1 em{font-style:normal;color:var(--red)}
.pinyin{font-family:var(--mono);font-size:12px;letter-spacing:.5em;color:var(--dim);text-transform:uppercase;margin-bottom:26px}
.tagline{font-size:21px;font-weight:700;letter-spacing:.03em;margin-bottom:18px}
.tagline span{color:var(--red);font-weight:400;margin:0 6px}
.intro{color:var(--ink2);font-size:14.5px;line-height:1.95;margin-bottom:26px;max-width:660px}
.intro u{text-decoration:none;border-bottom:1px solid var(--red);padding-bottom:1px}
.intro b{color:var(--ink);font-weight:600}

.leads{border-top:1px solid var(--rule);margin-bottom:26px;max-width:600px}
.leads div{display:flex;align-items:baseline;gap:10px;padding:9px 0;border-bottom:1px solid var(--rule2)}
.leads .k{font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--dim);width:78px;flex:0 0 78px}
.leads .v{font-size:13.5px}
.leads .dots{flex:1;border-bottom:1px dotted var(--rule);transform:translateY(-3px)}
.leads .n{font-family:var(--mono);font-size:12px;color:var(--red);white-space:nowrap}

.acts{display:flex;gap:10px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:11px 20px;
  font-size:13px;font-weight:600;letter-spacing:.03em;text-decoration:none;
  border:1px solid var(--ink);transition:.16s;
}
.btn.primary{background:var(--ink);color:var(--paper)}
.btn.primary:hover{background:var(--red);border-color:var(--red)}
.btn.ghost{color:var(--ink);background:transparent}
.btn.ghost:hover{border-color:var(--red);color:var(--red)}

/* contents card */
.idxw{position:relative}
.stamp{
  position:absolute;right:-10px;top:-18px;transform:rotate(-6deg);z-index:2;
  border:1.5px solid var(--red);color:var(--red);
  font-family:var(--mono);font-size:9px;letter-spacing:.18em;
  padding:4px 10px;background:rgba(242,239,230,.9);opacity:.92;
  box-shadow:0 1px 0 rgba(190,58,40,.12);
}
.idx{border:1px solid var(--ink);background:rgba(255,255,255,.42)}
.idx .hd{
  display:flex;justify-content:space-between;align-items:center;
  border-bottom:1px solid var(--rule);padding:9px 14px;background:rgba(18,41,60,.05);
}
.idx .hd span{font-family:var(--mono);font-size:9.5px;letter-spacing:.18em;color:var(--dim)}
.idx a{
  display:flex;align-items:baseline;gap:10px;padding:11px 14px;
  border-bottom:1px dotted var(--rule);text-decoration:none;color:var(--ink);font-size:13.5px;
  transition:.16s;
}
.idx a:last-of-type{border-bottom:0}
.idx a:hover{background:rgba(190,58,40,.06)}
.idx a b{font-family:var(--mono);font-size:10px;letter-spacing:.1em;color:var(--red);font-weight:400;width:22px;flex:0 0 22px}
.idx a i{font-style:normal;flex:1}
.idx a span{font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;color:var(--dim)}
.idx .ft{border-top:1px solid var(--rule);padding:9px 14px;display:flex;justify-content:space-between}
.idx .ft span{font-family:var(--mono);font-size:8.5px;letter-spacing:.14em;color:var(--dim)}

/* ---------- sheets ---------- */
.sheet{border:1px solid var(--ink);background:rgba(255,255,255,.34);margin-bottom:16px}
.sheet .top{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  border-bottom:1px solid var(--rule);padding:9px 18px;background:rgba(18,41,60,.045);
}
.sheet .top .code{font-family:var(--mono);font-size:10px;letter-spacing:.18em;color:var(--red)}
.sheet .top .t{font-size:13px;font-weight:700}
.sheet .top .r{margin-left:auto;font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;color:var(--dim)}
.sheet .body{display:grid;grid-template-columns:1fr 386px;gap:44px;padding:24px 24px 22px}
.sheet .body.narrow{grid-template-columns:1fr 232px}
.sheet h3{font-size:23px;font-weight:800;line-height:1.4;letter-spacing:.01em;margin-bottom:12px}
.sheet p{color:var(--ink2);font-size:13.5px;line-height:1.9;margin-bottom:11px}
.sheet p:last-child{margin-bottom:0}
.sheet p b{color:var(--ink);font-weight:600}

/* spec / BOM tables */
.bom{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:10.5px;table-layout:fixed}
.bom th{
  text-align:left;color:var(--dim);font-weight:400;letter-spacing:.12em;
  border-bottom:1px solid var(--rule);padding:5px 8px 6px 0;
}
.bom td{padding:6.5px 8px 6.5px 0;border-bottom:1px dotted var(--rule);vertical-align:top}
.bom td.v{color:var(--red);font-weight:600;letter-spacing:.02em}
.bom th:first-child,.bom td:first-child{width:88px}
.bom th:nth-child(2),.bom td:nth-child(2){width:190px}
.bom tr:last-child td{border-bottom:1px solid var(--rule)}

/* PCB figures */
.figband{display:grid;grid-template-columns:1.85fr 1fr;gap:1px;background:var(--rule);border-top:1px solid var(--rule)}
.fig{background:var(--paper2);padding:12px 14px 10px;display:flex;flex-direction:column}
.fig .im{
  border:1px solid var(--rule);background:#000;line-height:0;flex:1;
  display:flex;align-items:center;justify-content:center;overflow:hidden;
}
.fig .im img{width:100%;height:auto}
.fig .cp{
  margin-top:8px;font-family:var(--mono);font-size:9px;letter-spacing:.1em;
  color:var(--dim);display:flex;justify-content:space-between;gap:10px;
}
.fig .cp b{color:var(--ink);font-weight:600}

/* PE array diagram */
.pearr{display:grid;grid-template-columns:repeat(8,1fr);gap:3px}
.pearr i{display:block;aspect-ratio:1;border:1px solid var(--rule);background:rgba(18,41,60,.05)}
.pearr i.hot{background:rgba(190,58,40,.34)}
.pearr i.wgt{background:rgba(18,41,60,.52)}
.dia-cap{
  margin-top:9px;padding:0 2px;font-family:var(--mono);font-size:9px;letter-spacing:.1em;
  color:var(--dim);display:flex;justify-content:space-between;
}

/* ---------- project cards ---------- */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.pcard{
  border:1px solid var(--rule);background:rgba(255,255,255,.34);
  padding:20px 20px 18px;position:relative;display:flex;flex-direction:column;
}
.pcard:before{content:"";position:absolute;left:-1px;top:-1px;width:9px;height:9px;border-left:1px solid var(--ink);border-top:1px solid var(--ink)}
.pcard:after{content:"";position:absolute;right:-1px;bottom:-1px;width:9px;height:9px;border-right:1px solid var(--ink);border-bottom:1px solid var(--ink)}
.pcard .hd{display:flex;justify-content:space-between;font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;color:var(--dim);margin-bottom:9px}
.pcard .hd b{color:var(--red);font-weight:400}
.pcard h4{font-size:16.5px;font-weight:700;line-height:1.5;margin-bottom:8px}
.pcard p{font-size:12.5px;color:var(--ink2);line-height:1.85;margin-bottom:14px}
.pcard .ft{
  margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:12px;
  border-top:1px solid var(--rule2);padding-top:10px;
  font-family:var(--mono);font-size:9.5px;letter-spacing:.08em;color:var(--dim);
}
.pcard .ft u{text-decoration:none;color:var(--ink);border-bottom:1px solid var(--red);padding-bottom:1px;white-space:nowrap}

/* ---------- skills ---------- */
.skills{display:grid;grid-template-columns:1.5fr 1fr;gap:44px}
.skt{width:100%;border-collapse:collapse;table-layout:fixed}
.skt th{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;color:var(--dim);
  font-weight:400;text-align:left;border-bottom:1px solid var(--ink);padding:0 10px 7px 0;
}
.skt td{padding:9px 10px 9px 0;border-bottom:1px dotted var(--rule);font-size:13px;vertical-align:top}
.skt td.c{font-family:var(--mono);font-size:10px;color:var(--red);letter-spacing:.1em;width:34px}
.skt td.g{font-weight:700;width:64px}
.skt td.n{color:var(--ink2);font-size:12.5px;width:250px}

.steps{border-left:1px solid var(--rule);padding-left:20px}
.steps .st{position:relative;padding:6px 0}
.steps .st:before{
  content:"";position:absolute;left:-24px;top:14px;width:7px;height:7px;
  border-radius:50%;background:var(--paper);border:1px solid var(--ink);
}
.steps .st b{display:block;font-size:13.5px;font-weight:700;line-height:1.5}
.steps .st span{font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;color:var(--dim)}
.steps h5{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--red);margin-bottom:10px}

/* ---------- repositories ---------- */
.ghbar{
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
  border:1px solid var(--ink);border-top:0;background:rgba(18,41,60,.05);
  padding:10px 14px;margin-bottom:14px;
}
.ghbar .h{font-family:var(--mono);font-size:11px;letter-spacing:.12em;font-weight:600}
.ghbar .m{font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;color:var(--dim)}
.ghbar .r{margin-left:auto;font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;color:var(--red);text-decoration:none}
.ghbar .r:hover{text-decoration:underline}

.repos{width:100%;border-collapse:collapse}
.repos th{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;color:var(--dim);font-weight:400;
  text-align:left;border-bottom:1px solid var(--ink);padding:0 12px 8px 0;text-transform:uppercase;
}
.repos td{padding:10px 12px 10px 0;border-bottom:1px dotted var(--rule);font-size:13px;vertical-align:top}
.repos tr:last-child td{border-bottom:1px solid var(--ink)}
.repos td.rn{font-family:var(--mono);font-size:11.5px;letter-spacing:.02em;width:250px}
.repos td.rn b{font-weight:600}
.repos td.rn a{text-decoration:none;border-bottom:1px solid var(--red)}
.repos td.rn a:hover{color:var(--red)}
.repos td.rn i{display:block;font-style:normal;font-size:9.5px;letter-spacing:.1em;color:var(--dim);margin-top:2px}
.repos td.lg{width:126px;font-family:var(--mono);font-size:10px;letter-spacing:.06em;color:var(--ink2)}
.repos td.n{color:var(--ink2);font-size:12.5px}
.repos td.st{width:112px;text-align:right}
.repos td.st span{
  font-family:var(--mono);font-size:9px;letter-spacing:.1em;
  padding:2px 7px;border:1px solid var(--rule);color:var(--dim);white-space:nowrap;
}
.repos td.st span.pub{color:var(--red);border-color:rgba(190,58,40,.4)}
.ghnote{
  font-size:12px;line-height:1.9;color:var(--dim);
  border-left:2px solid var(--red);padding:2px 0 2px 12px;margin-top:14px;
  font-family:var(--sans);letter-spacing:.02em;
}

/* ---------- awards ledger ---------- */
.ledger{width:100%;border-collapse:collapse}
.ledger th{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;color:var(--dim);font-weight:400;
  text-align:left;border-bottom:1px solid var(--ink);padding:0 12px 8px 0;text-transform:uppercase;
}
.ledger td{padding:11px 12px 11px 0;border-bottom:1px solid var(--rule2);font-size:13.5px;vertical-align:top}
.ledger td.y{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--dim);width:96px}
.ledger td.n{color:var(--dim);font-size:12.5px}
.ledger td.lv{
  width:150px;font-family:var(--mono);font-size:10px;letter-spacing:.1em;
  color:var(--red);white-space:nowrap;
}
.ledger td.lv.s{color:var(--ink2)}
.ledger tr:last-child td{border-bottom:1px solid var(--ink)}

/* ---------- contact ---------- */
.cblock{border:1px solid var(--ink);background:rgba(255,255,255,.4)}
.cblock .in{display:grid;grid-template-columns:1fr 300px;gap:44px;padding:32px 30px;align-items:start}
.cblock h2{font-size:29px;font-weight:800;letter-spacing:-.01em;line-height:1.38;margin-bottom:12px}
.cblock p{color:var(--ink2);font-size:13.5px;margin-bottom:18px}
.cl{display:flex;gap:12px;padding:7px 0;border-bottom:1px dotted var(--rule);font-size:13.5px}
.cl b{font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;color:var(--dim);font-weight:400;width:56px;flex:0 0 56px;padding-top:4px}
.cl a{text-decoration:none;border-bottom:1px solid var(--red)}
.cl a:hover{color:var(--red)}
.cblock .acts{margin-top:20px}

.tb{border-left:1px solid var(--rule);padding-left:26px}
.tb .row{
  display:flex;justify-content:space-between;gap:16px;padding:6px 0;
  border-bottom:1px dotted var(--rule);font-family:var(--mono);font-size:10px;
  letter-spacing:.1em;color:var(--dim);
}
.tb .row b{color:var(--ink);font-weight:600;white-space:nowrap}

/* ---------- footer ---------- */
.site-footer{
  display:flex;align-items:center;gap:16px;
  padding:24px 0 40px;border-top:2px solid var(--ink);margin-top:30px;
}
.site-footer img{height:20px;width:auto;opacity:.65}
.site-footer .mono{color:var(--ink2);font-size:9.5px}
.site-footer .r{margin-left:auto;text-align:right}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .hero{grid-template-columns:1fr;gap:34px;padding:44px 0 40px}
  h1{font-size:84px}
  .idxw{max-width:420px}
  .sheet .body{grid-template-columns:1fr;gap:26px}
  .sheet .body.narrow{grid-template-columns:1fr}
  .skills{grid-template-columns:1fr;gap:32px}
  .cblock .in{grid-template-columns:1fr;gap:28px}
  .tb{border-left:0;padding-left:0;border-top:1px solid var(--rule);padding-top:18px}
}

@media (max-width:860px){
  :root{--pad:18px}
  .bar{height:auto;padding:10px 0;flex-wrap:wrap;gap:8px;row-gap:6px}
  .bar nav{width:100%;margin-left:0;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:2px}
  .bar nav a{padding:6px 8px}
  .shead .r{display:none}
  .grid2{grid-template-columns:1fr}
  .figband{grid-template-columns:1fr}
  .sheet .top .r{margin-left:0;width:100%}
}

@media (max-width:640px){
  body{font-size:14px}
  h1{font-size:64px}
  .pinyin{letter-spacing:.32em;margin-bottom:20px}
  .tagline{font-size:18px}
  .intro{font-size:14px}
  .leads .k{width:64px;flex:0 0 64px}
  .sheet .body{padding:18px 16px}
  .sheet h3{font-size:19.5px}
  .cblock .in{padding:22px 18px}
  .cblock h2{font-size:23px}
  .idxw{max-width:none}
  .stamp{right:-6px;top:-12px}
  .sheet .top{padding:8px 14px}
  .site-footer{flex-wrap:wrap}
  .site-footer .r{margin-left:0;width:100%;text-align:left}

  /* tables stack into blocks on phones (no horizontal squeeze) */
  .tablewrap{overflow-x:visible}
  .skt,.repos,.ledger,.bom{table-layout:auto;width:100%}
  .skt tr,.repos tr,.ledger tr,.bom tr{display:block;padding:9px 0;border-bottom:1px dotted var(--rule)}
  .skt tr:first-child,.repos tr:first-child,.ledger tr:first-child,.bom tr:first-child{display:none}
  .skt td,.repos td,.ledger td,.bom td{
    display:block;width:auto !important;border:0;padding:1px 0;
  }
  .skt td.c{display:inline-block;margin-right:7px;font-size:9.5px;vertical-align:2px}
  .skt td.g{display:inline-block;margin-right:8px}
  .skt td.g:empty{display:none}
  .skt td.n{color:var(--dim);font-size:12px}
  .repos td.lg{color:var(--dim)}
  .repos td.st{text-align:left;margin-top:5px}
  .ledger td.lv{margin-top:5px}
  .bom td:nth-child(2){color:var(--red);font-weight:600}
  .bom td:nth-child(3){color:var(--dim)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important;animation:none !important}
}

/* ---------- print ---------- */
@media print{
  .site-header,.stamp,.acts,.idx,.site-footer{display:none !important}
  body{background:#fff;background-image:none;font-size:11pt}
  .sheet,.pcard,.cblock{border-color:#999}
  section{padding-bottom:18px;break-inside:avoid}
}