:root {
  --ink: #1a2a32;
  --mute: #5b6b72;
  --pale: #eef3f1;
  --pale-2: #f7fbf9;
  --scald: #c45c3a;
  --scald-2: #e8a07a;
  --lock: #b42318;
  --ok: #2f6f5e;
  --line: rgba(26, 42, 50, 0.12);
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 108px; }
body { margin: 0; color: var(--ink); background: var(--pale); font-family: var(--sans); font-size: 16px; line-height: 1.7; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link, .live { color: var(--lock); border-bottom: 1px solid rgba(180,35,24,.35); }
footer .app-link { color: var(--scald-2); }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); background: rgba(196,92,58,.12); padding: 0.05em 0.35em; }
.steel { pointer-events: none; position: fixed; inset: 0; z-index: 5; opacity: 0.1; background-image: url("images/texture.webp"); background-size: 420px auto; mix-blend-mode: multiply; }
.lock-banner {
  position: fixed; top: 0; left: 0; right: 0; z-index: 46; margin: 0;
  background: var(--lock); color: #fff; font-family: var(--mono); font-size: 12px;
  letter-spacing: 0.08em; text-align: center; padding: 6px 12px;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 40px; z-index: 80; background: #fff; padding: 8px; }

.nav {
  position: fixed; top: 28px; left: 0; right: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 8px 20px; background: rgba(238,243,241,.94); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand small { display: block; font-family: var(--mono); font-size: 10px; color: var(--mute); letter-spacing: 0.12em; font-weight: 400; }
.hook { width: 22px; height: 22px; border: 3px solid var(--ink); border-radius: 50%; border-bottom-color: var(--scald); }
.nav-toggle { display: none; background: transparent; border: 1px solid var(--ink); padding: 6px 12px; }
.nav-links { display: flex; gap: 14px; align-items: center; font-size: 13px; }
.nav-links a { color: var(--mute); }
.nav-links a.is-active, .nav-links a:hover { color: var(--lock); }
.nav-links .live { padding: 5px 10px; border: 1px solid var(--lock); }

.hero { position: relative; min-height: 100vh; display: grid; align-items: end; overflow: hidden; color: var(--pale-2); }
.hero picture { position: absolute; inset: 0; }
.hero img { width: 100%; height: 100%; object-fit: cover; }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(26,42,50,.2), rgba(26,42,50,.88) 78%); }
.hero-copy { position: relative; z-index: 1; padding: 22vh 7vw 10vh; max-width: 820px; }
.kicker, .vlabel { font-family: var(--mono); letter-spacing: 0.2em; font-size: 11px; color: var(--scald-2); margin: 0 0 12px; }
.vlabel { color: var(--scald); }
h1, h2, h3 { margin: 0 0 14px; line-height: 1.08; word-break: keep-all; }
h1 { font-size: clamp(36px, 6.4vw, 84px); }
h2 { font-size: clamp(24px, 3.2vw, 38px); }
h3 { font-size: 20px; }
.lead { max-width: 40em; word-break: keep-all; overflow-wrap: anywhere; }
.gauges { display: flex; flex-wrap: wrap; gap: 16px; margin: 22px 0; }
.gauge { min-width: 160px; padding: 12px 16px; border: 1px solid rgba(255,255,255,.25); }
.gauge p { margin: 0; font-size: 12px; font-family: var(--mono); }
.gauge strong { display: block; font-size: 42px; font-family: var(--mono); line-height: 1.1; }
.gauge.low strong { color: #ffd0c8; }
.gauge.hot strong { color: var(--scald-2); }
.gauge span { font-size: 12px; color: rgba(238,243,241,.75); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 16px; border: 1px solid currentColor; font-size: 14px; }
.btn-fill { background: var(--lock); color: #fff; border-color: var(--lock); }
.btn-ghost { background: transparent; color: inherit; }

.wrap { width: min(1100px, calc(100% - 40px)); margin: 0 auto; padding: 88px 0; }
.section-head { display: grid; grid-template-columns: 140px 1fr; gap: 20px; margin-bottom: 36px; }
.section-head p:last-child { color: var(--mute); margin: 0; }
.tri, .bench-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.tile { background: var(--pale-2); border: 1px solid var(--line); padding: 18px; min-height: 200px; }
.tile.warn { border-top: 6px solid var(--lock); }
.stamp { display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; border: 1px solid var(--ink); padding: 2px 8px; margin-bottom: 8px; }
.tile ul, .io ul, .rule-list { margin: 0; padding-left: 1.1em; }
.tile li, .io li, .rule-list li { margin: 0.35em 0; }
.alt { background: #e3ece9; }

.river { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; list-style: none; padding: 0; margin: 0 0 48px; }
.river li { text-align: center; padding: 10px 4px; font-family: var(--mono); font-size: 12px; background: #fff; border-right: 1px solid var(--line); position: relative; }
.river li::after { content: ""; position: absolute; right: -6px; top: 50%; width: 12px; height: 12px; background: var(--scald); border-radius: 50%; transform: translateY(-50%); z-index: 1; }
.river li:last-child::after { display: none; }
.river li:last-child { background: #f8d7d4; }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; margin-bottom: 60px; }
.row.flip { direction: rtl; }
.row.flip > * { direction: ltr; }
.num { font-family: var(--mono); color: var(--scald); display: block; margin-bottom: 6px; }
figure { margin: 0; }
figure img { width: 100%; height: 300px; object-fit: cover; }
figcaption { margin-top: 8px; font-size: 13px; color: var(--mute); }
.demo { margin-top: 16px; padding: 12px; border: 1px dashed var(--lock); }
.demo-kicker { margin: 0 0 8px; font-family: var(--mono); font-size: 11px; color: var(--lock); }

.io { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.io > div { background: var(--pale-2); padding: 18px; border-left: 8px solid var(--scald); }
footer { background: var(--ink); color: var(--pale); }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; padding: 28px 0; font-size: 13px; }

@media (max-width: 960px) {
  .hero, .row, .section-head, .tri, .bench-grid, .io, .footer-inner, .river { grid-template-columns: 1fr; }
  .hero { min-height: 100svh; }
  .hero-copy { padding: 130px 20px 48px; }
  .nav { flex-wrap: wrap; }
  .nav-toggle { display: inline-flex; margin-left: auto; background: var(--pale-2); position: relative; z-index: 60; }
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; padding: 12px 16px; background: var(--pale-2); z-index: 55; }
  .nav-links.open { display: flex; }
  .river li::after { display: none; }
  figure img { height: 210px; }
}