:root {
  --hold: #123040;
  --deep: #0b1e28;
  --ice: #e8f2f6;
  --frost: #f4fbfd;
  --sea: #78b8c8;
  --melt: #e8a0b8;
  --ink: #14303c;
  --mute: #5e7a86;
  --serif: "Newsreader", "Noto Serif SC", "Songti SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 72px; }
body {
  margin: 0;
  background: var(--ice);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
  padding-left: 132px;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: #0b6a7a; text-decoration: underline; text-underline-offset: 3px; }
button, input { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); background: rgba(232, 160, 184, 0.28); padding: 0 0.3em; }
.frost {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 6;
  opacity: 0.22;
  background-image: url("images/texture.webp");
  background-size: 280px;
  mix-blend-mode: multiply;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 140px; top: 10px; z-index: 80; background: var(--sea); padding: 8px; }

.well {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 132px;
  z-index: 40;
  background: var(--deep);
  color: var(--ice);
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-right: 1px solid rgba(120, 184, 200, 0.4);
}
.well-title, .well-foot { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--sea); margin: 0 0 8px; }
.well-foot { margin-top: auto; }
.layer {
  text-align: left;
  background: rgba(232, 242, 246, 0.08);
  color: var(--ice);
  border: 1px solid rgba(120, 184, 200, 0.35);
  padding: 10px 8px;
  font-family: var(--mono);
  font-size: 13px;
}
.layer small { display: block; font-size: 10px; color: var(--sea); font-weight: 400; }
.layer.hot { background: var(--melt); color: var(--deep); border-color: var(--melt); }
.layer.hot small { color: var(--hold); }
.layer.on { outline: 2px solid #fff; outline-offset: 2px; }

.frost-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 22px;
  background: rgba(244, 251, 253, 0.86);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(18, 48, 64, 0.12);
}
.brand { font-family: var(--serif); font-weight: 700; }
.brand small { display: block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; color: var(--mute); font-weight: 400; }
.nav-toggle { display: none; background: transparent; border: 1px solid var(--hold); padding: 6px 12px; }
.nav-links { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; }
.nav-links a { color: var(--mute); }
.nav-links a.is-active, .nav-links a:hover { color: var(--hold); }
.nav-links .live { background: var(--hold); color: var(--ice); padding: 6px 12px; border-radius: 999px; }

.hero { position: relative; min-height: 100vh; display: grid; align-items: end; overflow: hidden; }
.hero > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 30, 40, 0.15), rgba(11, 30, 40, 0.72));
}
.glass {
  position: relative;
  z-index: 1;
  margin: 8vh 6vw 7vh;
  max-width: 720px;
  padding: 28px 28px 24px;
  background: rgba(244, 251, 253, 0.78);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 4px 28px 4px 4px;
}
.kicker, .vlabel {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 11px;
  color: #0b6a7a;
  margin: 0 0 10px;
}
h1, h2, h3 { font-family: var(--serif); margin: 0 0 14px; line-height: 1.08; }
h1 { font-size: clamp(40px, 6.4vw, 78px); }
h1 em { font-style: italic; color: #9a4060; font-weight: 500; }
h2 { font-size: clamp(28px, 3.2vw, 42px); }
h3 { font-size: 22px; }
.lead, .quiet { max-width: 46em; }
.ice-chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 18px 0; }
.ice-chips li {
  border: 1px solid rgba(18, 48, 64, 0.2);
  padding: 4px 10px;
  font-family: var(--mono);
  font-size: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.5);
}
.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; padding: 10px 16px; border: 1px solid currentColor; border-radius: 999px; }
.btn.fill { background: var(--hold); color: var(--ice); border-color: var(--hold); }
.btn.line { color: var(--hold); }

.wrap { width: min(1080px, calc(100% - 40px)); margin: 0 auto; padding: 80px 0; }
.frost-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }
.frost-3 article {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(18, 48, 64, 0.12);
  padding: 18px;
  border-radius: 4px 24px 4px 4px;
}
.melt-card { background: rgba(232, 160, 184, 0.28) !important; }
.frost-3 ul { margin: 0; padding-left: 1.1em; }

.hold-band { background: var(--hold); color: var(--ice); }
.hold-band .vlabel { color: var(--sea); }
.hold-band .quiet { color: rgba(232, 242, 246, 0.75); }
.cut { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; margin-bottom: 40px; }
.cut.flip { direction: rtl; }
.cut.flip > * { direction: ltr; }
.cut figure { margin: 0; }
.cut img { width: 100%; height: 260px; object-fit: cover; border-radius: 4px 32px 4px 4px; }
.cut figcaption { font-size: 13px; color: rgba(232, 242, 246, 0.7); margin-top: 8px; font-style: italic; font-family: var(--serif); }
.num { font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; color: var(--sea); display: block; margin-bottom: 8px; }

.demo {
  background: #fff;
  border: 1px solid rgba(18, 48, 64, 0.12);
  padding: 20px;
  border-radius: 4px 28px 4px 4px;
}
#layer-read { font-family: var(--serif); font-size: 22px; }
.demo label { font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; display: block; margin: 12px 0 8px; }
#ice-cm { width: 100%; accent-color: var(--melt); }
.value-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 12px; }
.value-4 article {
  background: rgba(232, 242, 246, 0.08);
  border-top: 4px solid var(--sea);
  padding: 16px;
}
ol { padding-left: 1.2em; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid rgba(232, 242, 246, 0.2); }
th { font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; }
.foot-live { margin-top: 22px; }

@media (max-width: 960px) {
  body { padding-left: 0; }
  .well { display: none; }
  .nav-toggle { display: inline-flex; }
  .frost-bar { flex-wrap: wrap; }
  .nav-links { display: none; width: 100%; }
  .nav-links.open { display: flex; }
  .frost-3, .cut, .value-4 { grid-template-columns: 1fr; }
  .cut.flip { direction: ltr; }
  h1 { font-size: clamp(34px, 11vw, 52px); }
  .hero { min-height: 88vh; }
  .glass { margin: 18vh 16px 24px; }
}