:root {
  --bg: #ffffff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --faint: #86868b;
  --line: #d2d2d7;
  --soft: #f5f5f7;
  --soft-2: #fbfbfd;
  --accent: #0071e3;
  --accent-dark: #0058b0;
  --ok: #1d7a46;
  --ok-bg: #eef8f2;
  --hold: #9a6700;
  --hold-bg: #fff8eb;
  --alert: #b42318;
  --alert-bg: #fef3f2;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
  --radius: 18px;
  --max: 1080px;
  --nav: 52px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 22px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand strong {
  font-weight: 620;
  letter-spacing: 0.14em;
  font-size: 14px;
}
.brand span {
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.01em;
}
.nav-links {
  display: flex;
  gap: 22px;
  align-items: center;
}
.nav-links a {
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 0.01em;
  text-decoration: none;
  opacity: 0.82;
}
.nav-links a:hover,
.nav-links a.active { opacity: 1; text-decoration: none; }
.nav-links a.pill {
  background: var(--ink);
  color: #fff;
  opacity: 1;
  border-radius: 980px;
  padding: 6px 12px;
  font-size: 12px;
}
.nav-toggle { display: none; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.hero { padding: 88px 0 56px; text-align: center; }
.kicker {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin: 0 0 14px;
}
h1 {
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.028em;
  font-weight: 620;
  margin: 0 auto 18px;
  max-width: 16ch;
}
.lede {
  max-width: 640px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 21px;
  line-height: 1.4;
  letter-spacing: -0.015em;
}
.actions { display: flex; gap: 12px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 980px;
  padding: 12px 20px;
  font-size: 15px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  font-family: inherit;
}
.btn:hover { text-decoration: none; }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { background: #333; }
.btn-line { background: transparent; color: var(--accent); border: 1px solid transparent; }
.btn-line:hover { text-decoration: underline; }
.btn-ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn-ghost:hover { background: var(--soft); }
.btn-small { padding: 8px 14px; font-size: 14px; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.band { background: var(--soft); }
.section { padding: 80px 0; }
.section h2 {
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.025em;
  font-weight: 620;
  line-height: 1.12;
  margin: 0 0 12px;
}
.sub {
  color: var(--muted);
  font-size: 19px;
  max-width: 680px;
  margin: 0 0 32px;
  letter-spacing: -0.01em;
}
.grid-3, .grid-2 { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 26px;
  box-shadow: var(--shadow);
}
.band .card { box-shadow: none; border: 1px solid rgba(0,0,0,0.04); }
.card h3 {
  margin: 0 0 8px;
  font-size: 21px;
  letter-spacing: -0.02em;
  font-weight: 620;
}
.card p, .prose p { color: #3a3a3c; }
.card .num {
  color: var(--faint);
  font-size: 13px;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.prose { max-width: 740px; }
.prose h2 { margin-top: 48px; }
.prose p, .prose li { font-size: 17px; color: #2c2c2e; }
.prose ul { padding-left: 18px; }
.prose li { margin: 8px 0; }
.note {
  background: var(--soft);
  border-radius: 14px;
  padding: 16px 18px;
  color: var(--muted);
  font-size: 14px;
}
.cite { color: var(--faint); font-size: 13px; }

.curve-card {
  background: #fff;
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow);
}
.curve-card svg { width: 100%; height: auto; display: block; }
.legend { display: flex; gap: 18px; font-size: 13px; color: var(--muted); margin-top: 8px; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; margin-right: 6px; }

.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}
.feature-list { list-style: none; padding: 0; margin: 0; }
.feature-list li {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.feature-list strong { display: block; letter-spacing: -0.015em; }
.feature-list span { color: var(--muted); font-size: 15px; }

.resource {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.resource .tag {
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint);
  padding-top: 4px;
}
.resource h3 { margin: 0 0 6px; font-size: 19px; letter-spacing: -0.02em; }
.resource p { margin: 0; color: var(--muted); font-size: 15px; }

.footer {
  border-top: 1px solid var(--line);
  padding: 36px 0 48px;
  color: var(--faint);
  font-size: 12px;
}
.footer .wrap { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer a { color: var(--muted); }

.banner {
  background: #fff8eb;
  color: #6b4b00;
  font-size: 13px;
  text-align: center;
  padding: 10px 16px;
  border-bottom: 1px solid #f0e2c4;
}

.app-shell { padding: 36px 0 72px; }
.app-head { max-width: 760px; margin-bottom: 28px; }
.app-head h1 { font-size: clamp(36px, 5vw, 52px); max-width: none; text-align: left; margin: 0 0 10px; }
.app-head p { color: var(--muted); margin: 0; font-size: 18px; }
.status {
  border-radius: 16px;
  padding: 16px 18px;
  margin-bottom: 16px;
}
.status strong { display: block; font-size: 18px; letter-spacing: -0.02em; }
.status.ok { background: var(--ok-bg); color: var(--ok); }
.status.hold { background: var(--hold-bg); color: var(--hold); }
.status.alert { background: var(--alert-bg); color: var(--alert); }
.status.idle { background: var(--soft); color: var(--ink); }
.panel {
  background: #fff;
  border: 1px solid #ececef;
  border-radius: 20px;
  padding: 20px;
}
.panel h3 { margin: 0 0 4px; font-size: 17px; }
.panel .hint { color: var(--faint); font-size: 13px; margin: 0 0 14px; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
input[type="text"], input[type="number"], input[type="date"], select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  font: inherit;
  font-size: 15px;
  background: #fff;
  color: var(--ink);
}
textarea { min-height: 72px; resize: vertical; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.scale { margin: 12px 0 16px; }
.scale-top { display: flex; justify-content: space-between; align-items: baseline; }
.scale-top strong { font-size: 15px; }
.scale-top em { font-style: normal; color: var(--ink); font-variant-numeric: tabular-nums; }
.scale input[type="range"] { width: 100%; accent-color: var(--ink); }
.scale small { color: var(--faint); }
.check { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; color: #3a3a3c; margin: 8px 0 14px; }
.check input { margin-top: 3px; }
.row-actions { display: flex; gap: 8px; flex-wrap: wrap; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid #eee; }
th { color: var(--faint); font-weight: 560; font-size: 12px; letter-spacing: 0.04em; }
.chart { width: 100%; height: auto; }
.mini-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 12px; }
.mini-stats div { background: var(--soft); border-radius: 12px; padding: 10px 12px; }
.mini-stats b { display: block; font-size: 18px; letter-spacing: -0.02em; }
.mini-stats span { color: var(--faint); font-size: 12px; }
.logs { max-height: 280px; overflow: auto; }

@media (max-width: 860px) {
  .grid-3, .grid-2, .split, .fields, .resource { grid-template-columns: 1fr; }
  .nav-toggle { display: block; background: none; border: 0; font-size: 20px; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav);
    left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 22px 18px;
    border-bottom: 1px solid var(--line);
    gap: 12px;
  }
  .nav-links.open { display: flex; }
  .hero { padding: 56px 0 36px; }
  .section { padding: 56px 0; }
  .brand span { display: none; }
}