:root{
  --bg:#eef2f6;
  --bg-2:#e6ebf1;
  --panel:#ffffff;
  --panel-2:#f8fafc;
  --text:#15202b;
  --muted:#566574;
  --soft:#778493;
  --line:#d8e0e8;
  --line-2:#c5d0db;
  --accent:#0f5d7f;
  --accent-2:#8c5a28;
  --accent-3:#395d6c;
  --shadow:0 22px 56px rgba(21,32,43,.08);
  --shadow-soft:0 10px 24px rgba(21,32,43,.06);
  --radius-xl:28px;
  --radius-lg:20px;
  --radius-md:14px;
  --max:1280px;
  color-scheme:light;
  scroll-behavior:smooth;
  font-family:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  line-height:1.72;
}

*{box-sizing:border-box}
html,body{margin:0;min-width:320px;min-height:100%}
body{
  color:var(--text);
  background:
    radial-gradient(circle at 14% 6%, rgba(15,93,127,.08), transparent 18%),
    radial-gradient(circle at 86% 10%, rgba(140,90,40,.08), transparent 17%),
    radial-gradient(circle at 50% 120%, rgba(57,93,108,.08), transparent 28%),
    linear-gradient(180deg, #f6f8fb 0%, var(--bg) 100%);
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(21,32,43,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21,32,43,.03) 1px, transparent 1px);
  background-size:48px 48px;
  opacity:.55;
  mask-image:linear-gradient(180deg, rgba(0,0,0,.34), transparent 86%);
}

a{color:inherit;text-decoration:none}
p,ul,ol,dl,figure{margin:0}

.skip-link{
  position:absolute;
  left:-999px;
  top:10px;
  z-index:100;
  padding:10px 14px;
  border-radius:999px;
  background:#fff;
  color:#111;
  box-shadow:var(--shadow-soft);
}
.skip-link:focus{left:12px}

.page{
  width:min(var(--max), calc(100vw - 24px));
  margin:0 auto;
  padding:16px 0 48px;
  position:relative;
  z-index:1;
}

.masthead{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:14px 18px;
  border:1px solid rgba(21,32,43,.08);
  border-radius:999px;
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(14px);
  box-shadow:var(--shadow-soft);
  position:sticky;
  top:10px;
  z-index:20;
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
}
.brand-mark{
  width:46px;
  height:46px;
  border-radius:16px;
  flex:0 0 auto;
  display:grid;
  place-items:center;
  color:#fff;
  background:linear-gradient(145deg, var(--accent), #2b7591 58%, #e09e5d);
  box-shadow:0 12px 24px rgba(15,93,127,.18);
  font:800 18px/1 "Songti SC","STSong","Noto Serif SC",serif;
}
.brand-copy strong{
  display:block;
  font-size:15px;
  line-height:1.15;
  letter-spacing:.02em;
}
.brand-copy span{
  display:block;
  margin-top:3px;
  color:var(--muted);
  font-size:12px;
}

.nav{
  display:flex;
  flex-wrap:wrap;
  justify-content:flex-end;
  gap:8px;
}
.nav a{
  padding:9px 12px;
  border-radius:999px;
  border:1px solid transparent;
  color:var(--muted);
  background:rgba(15,93,127,.05);
  transition:transform .16s ease, background .16s ease, border-color .16s ease, color .16s ease;
}
.nav a:hover,
.nav a:focus-visible{
  transform:translateY(-1px);
  background:rgba(15,93,127,.09);
  border-color:rgba(15,93,127,.15);
  color:var(--text);
  outline:none;
}

main{
  display:grid;
  gap:18px;
  margin-top:16px;
}

.intro{
  display:grid;
  grid-template-columns:minmax(0,1.2fr) minmax(320px,.8fr);
  gap:18px;
  align-items:stretch;
}

.intro-copy,
.visual-card,
.section-table,
.section-signals,
.section-steps,
.section-notes,
.about-card,
.about-panel{
  border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(255,255,255,.98), rgba(248,250,252,.98));
  box-shadow:var(--shadow);
}

.intro-copy{
  border-radius:var(--radius-xl);
  padding:28px;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  gap:18px;
}

.eyebrow{
  display:inline-flex;
  width:fit-content;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid rgba(15,93,127,.16);
  background:rgba(15,93,127,.08);
  color:#315163;
  font-size:12px;
  letter-spacing:.04em;
  text-transform:none;
}

h1,
h2,
h3{
  margin:0;
  line-height:1.12;
  letter-spacing:-.04em;
}

h1{
  font-size:clamp(38px, 4.8vw, 72px);
  max-width:10ch;
}

.lead{
  font-size:18px;
  color:var(--text);
  max-width:62ch;
}

.intro-tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.intro-tags span{
  padding:10px 13px;
  border-radius:999px;
  background:#f0f5f8;
  border:1px solid rgba(21,32,43,.08);
  color:var(--muted);
  font-size:13px;
}

.visual-card{
  border-radius:var(--radius-xl);
  padding:14px;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.visual-card img{
  width:100%;
  display:block;
  height:auto;
  border-radius:22px;
  background:#fff;
}
.visual-card figcaption{
  color:var(--muted);
  font-size:13px;
  padding:0 6px 2px;
}

.section{
  scroll-margin-top:112px;
}

.section-table,
.section-signals,
.section-steps,
.section-notes,
.about-card,
.about-panel{
  border-radius:var(--radius-xl);
}

.section-table,
.section-signals,
.section-steps,
.section-notes{
  padding:24px;
}

.section-head{
  display:grid;
  gap:10px;
  margin-bottom:18px;
}

.section-head h2{
  font-size:clamp(24px, 3vw, 38px);
}
.section-head p{
  color:var(--muted);
  max-width:70ch;
}

.table-wrap{
  overflow:auto;
  border-radius:22px;
  border:1px solid var(--line);
  background:linear-gradient(180deg, #fff, #fbfcfe);
}
.result-table{
  width:100%;
  border-collapse:collapse;
  min-width:760px;
}
.result-table caption{
  caption-side:bottom;
  padding:10px 12px 12px;
  color:var(--muted);
}
.result-table th,
.result-table td{
  padding:16px 18px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
  text-align:left;
}
.result-table thead th{
  font-size:13px;
  color:#35566b;
  background:#f4f8fb;
}
.result-table tbody th{
  width:18%;
  font-size:15px;
}
.result-table td{
  color:var(--text);
}
.result-table tbody tr:last-child th,
.result-table tbody tr:last-child td{
  border-bottom:none;
}

.signal-grid{
  display:grid;
  grid-template-columns:repeat(4, minmax(0,1fr));
  gap:14px;
}
.signal-card{
  padding:18px;
  border-radius:22px;
  border:1px solid var(--line);
  background:linear-gradient(180deg, #fff, #f8fbfd);
  box-shadow:var(--shadow-soft);
}
.signal-card h3{
  font-size:18px;
  margin-bottom:10px;
}
.signal-card p{
  color:var(--muted);
}

.steps{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  grid-template-columns:repeat(3, minmax(0,1fr));
  gap:14px;
}
.steps li{
  padding:18px;
  border-radius:22px;
  background:linear-gradient(180deg, #fff, #f8fbfd);
  border:1px solid var(--line);
  box-shadow:var(--shadow-soft);
}
.steps strong{
  display:block;
  margin-bottom:10px;
  font-size:16px;
}
.steps p{
  color:var(--muted);
}

.notes-box{
  padding:4px 2px 0;
}
.notes-box h2{
  font-size:28px;
  margin-bottom:10px;
}
.notes-box p{
  color:var(--muted);
  max-width:68ch;
}

.footer{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 4px 4px;
  color:var(--muted);
}
.footer a{
  color:var(--text);
  padding-bottom:2px;
  border-bottom:1px solid rgba(21,32,43,.14);
}

.about-card{
  padding:28px;
  display:grid;
  gap:16px;
}
.about-card h1{
  font-size:clamp(32px, 4vw, 54px);
  max-width:14ch;
}
.about-grid{
  display:grid;
  grid-template-columns:repeat(3, minmax(0,1fr));
  gap:14px;
}
.about-panel{
  padding:20px;
  display:grid;
  gap:10px;
}
.about-panel h2{
  font-size:18px;
}
.about-panel p{
  color:var(--muted);
}
.footer-about{
  margin-top:8px;
}

.sr-only{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}

@media (max-width: 1080px){
  .signal-grid,
  .about-grid{
    grid-template-columns:repeat(2, minmax(0,1fr));
  }
  .steps{
    grid-template-columns:1fr;
  }
}

@media (max-width: 900px){
  .masthead{
    border-radius:24px;
    align-items:flex-start;
    flex-direction:column;
  }
  .nav{
    justify-content:flex-start;
  }
  .intro{
    grid-template-columns:1fr;
  }
}

@media (max-width: 640px){
  .page{
    width:min(var(--max), calc(100vw - 16px));
    padding-top:8px;
  }
  .masthead{
    padding:14px;
  }
  .intro-copy,
  .visual-card,
  .section-table,
  .section-signals,
  .section-steps,
  .section-notes,
  .about-card,
  .about-panel{
    border-radius:22px;
  }
  .intro-copy{
    padding:20px;
  }
  .visual-card{
    padding:12px;
  }
  h1{
    font-size:clamp(32px, 10vw, 46px);
  }
  .lead{
    font-size:16px;
  }
  .signal-grid,
  .about-grid{
    grid-template-columns:1fr;
  }
  .section-table,
  .section-signals,
  .section-steps,
  .section-notes{
    padding:18px;
  }
  .footer{
    flex-direction:column;
    align-items:flex-start;
  }
}