:root {
  --chart-linen: #dfe6d4;
  --channel-ink: #0e1f2c;
  --phosphor-wake: #3ee08a;
  --statute-amber: #e8720c;
  --fog-gauze: #9aa7b0;
  --vhf-thread: #7e93a8;
  --paper: #e8eedf;
  --mute: #5f7185;
  --ok: #1f8a58;
  --hot: #c43a3a;
  --display: "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: 76px; }

body {
  margin: 0;
  color: var(--channel-ink);
  background: var(--chart-linen);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link {
  color: var(--statute-amber);
  text-decoration: underline;
  text-underline-offset: 3px;
}
button { font-family: inherit; cursor: pointer; }
code {
  font-family: var(--mono);
  background: rgba(62, 224, 138, 0.16);
  padding: 0.05em 0.35em;
}

.linen-skin {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 8;
  opacity: 0.18;
  background-image: url("images/texture.webp");
  background-size: 320px auto;
  mix-blend-mode: multiply;
}

.fog-glyph {
  position: fixed;
  right: -0.08em;
  top: 12vh;
  font-family: var(--display);
  font-size: 46vh;
  line-height: 0.8;
  color: rgba(14, 31, 44, 0.07);
  pointer-events: none;
  z-index: 0;
  writing-mode: vertical-rl;
}

.skip { position: absolute; left: -999px; }
.skip:focus {
  left: 12px;
  top: 12px;
  z-index: 80;
  background: var(--channel-ink);
  color: var(--phosphor-wake);
  padding: 8px;
}

.desk-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 22px;
  background: rgba(223, 230, 212, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(14, 31, 44, 0.12);
  box-shadow: inset 0 -2px 0 var(--phosphor-wake);
}
.brand {
  font-family: var(--display);
  font-size: 22px;
  letter-spacing: 0.04em;
}
.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--mute);
}
.nav-toggle {
  display: none;
  background: var(--channel-ink);
  color: var(--phosphor-wake);
  border: 0;
  border-radius: 2px;
  padding: 8px 14px;
  letter-spacing: 0.12em;
}
.channel-nav {
  display: flex;
  gap: 14px;
  align-items: center;
  font-size: 13px;
}
.channel-nav a { color: var(--mute); }
.channel-nav a.is-active,
.channel-nav a:hover { color: var(--channel-ink); }
.channel-nav a.live {
  background: var(--channel-ink);
  color: var(--phosphor-wake);
  padding: 7px 14px;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 12px;
}

.sand-hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 0;
  min-height: calc(100vh - 58px);
  position: relative;
  z-index: 1;
  background: var(--channel-ink);
  color: var(--paper);
}
.chart-plate {
  margin: 0;
  position: relative;
  min-height: 100%;
  overflow: hidden;
}
.chart-plate img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: calc(100vh - 58px);
}
.fog-veil {
  position: absolute;
  inset: 0;
  background-image: url("images/gauze.webp");
  background-size: cover;
  opacity: 0.28;
  mix-blend-mode: soft-light;
  pointer-events: none;
  transition: opacity 0.35s ease;
}
body.gauze-open .fog-veil { opacity: 0.03; }

.cartouche {
  padding: 28px 4.5vw 32px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background:
    linear-gradient(180deg, rgba(14, 31, 44, 0.15), rgba(14, 31, 44, 0.88)),
    var(--channel-ink);
}
.kicker {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 11px;
  color: #1f6b4a;
  margin: 0 0 10px;
}
.sand-hero .kicker,
.ink-well .kicker {
  color: var(--phosphor-wake);
}
h1, h2, h3 {
  font-family: var(--display);
  margin: 0 0 12px;
  line-height: 1.14;
  font-weight: 700;
}
h1 { font-size: clamp(32px, 4.4vw, 56px); }
h2 { font-size: clamp(26px, 3.2vw, 42px); }
h3 { font-size: 22px; }
.lead {
  max-width: 44em;
  color: #c9d4c4;
  font-size: 15px;
  margin: 0 0 14px;
}
.quiet { color: var(--mute); max-width: 46em; }

.fog-lever {
  margin: 0 0 12px;
  padding: 12px 14px;
  background: rgba(232, 238, 223, 0.08);
  border: 1px solid rgba(62, 224, 138, 0.28);
  border-left: 4px solid var(--statute-amber);
}
.fog-lever .kicker { margin-bottom: 8px; }
.fog-lever label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
}
.fog-lever input { flex: 1; accent-color: var(--statute-amber); }
#fog-state { margin: 8px 0 10px; font-size: 13px; }
.gate-ok { color: var(--phosphor-wake); }
.gate-hot { color: var(--statute-amber); }
.gate-severe { color: #ff8a7a; }
#gauze-lift {
  background: transparent;
  color: var(--paper);
  border: 1px solid var(--phosphor-wake);
  padding: 6px 12px;
  font-size: 12px;
  letter-spacing: 0.12em;
}

.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border-radius: 2px;
  font-size: 14px;
}
.btn.fill {
  background: var(--statute-amber);
  color: #fff;
}
.btn.ghost {
  border: 1px solid var(--paper);
  color: var(--paper);
}

.fold {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 72px 0;
  position: relative;
  z-index: 1;
}
.ink-well {
  background: var(--channel-ink);
  color: var(--paper);
}
.ink-well .kicker { color: var(--phosphor-wake); }
.ink-well .quiet { color: #9db0c2; }
.ink-well .app-link { color: var(--phosphor-wake); }
.ink-well code { background: rgba(62, 224, 138, 0.18); color: var(--paper); }

.buoy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 28px;
}
.buoy-grid article,
.trough article,
.io > div {
  background: #f4f7ec;
  padding: 18px 20px;
  border-top: 3px solid var(--phosphor-wake);
  box-shadow: 0 12px 28px rgba(14, 31, 44, 0.08);
}
.buoy-grid article.hot {
  background: #f8e4d4;
  border-top-color: var(--statute-amber);
}
.buoy-grid ul, .io ul, .statute, .wake-pair ul { margin: 0; padding-left: 1.1em; }
.buoy-grid li, .io li, .statute li, .wake-pair li { margin: 0 0 6px; }

.wake-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  margin: 32px 0;
}
.wake-pair.flip { direction: rtl; }
.wake-pair.flip > * { direction: ltr; }
.num {
  font-family: var(--mono);
  letter-spacing: 0.14em;
  color: var(--statute-amber);
  font-size: 12px;
  margin: 0 0 8px;
}
.wake-pair figure { margin: 0; }
.wake-pair img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  clip-path: polygon(0 8%, 100% 0, 100% 92%, 0 100%);
}
.wake-pair figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: #9db0c2;
}

.trough {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 28px;
}
.ink-well .trough article,
.ink-well .io > div {
  background: rgba(232, 238, 223, 0.08);
  color: var(--paper);
  border-top-color: var(--phosphor-wake);
}

.bench-desk {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 20px;
  margin-top: 24px;
  align-items: stretch;
}
.mini-sand {
  width: 100%;
  height: auto;
  border: 1px solid rgba(14, 31, 44, 0.2);
  background: var(--channel-ink);
}
.bench-readout {
  background: var(--channel-ink);
  color: var(--paper);
  padding: 18px 20px;
  font-family: var(--mono);
  font-size: 13px;
}
.bench-readout p {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin: 0;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(232, 238, 223, 0.2);
}
.bench-readout span { color: #9db0c2; }
.bench-readout.hot strong { color: var(--statute-amber); }
.bench-readout.ok strong { color: var(--phosphor-wake); }

.value-seats {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
}
.value-seats article {
  background: rgba(232, 238, 223, 0.08);
  padding: 0 0 18px;
}
.value-seats img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  margin-bottom: 14px;
}
.value-seats h3, .value-seats p { padding: 0 16px; }

.statute {
  max-width: 46em;
  border-left: 4px solid var(--statute-amber);
  padding: 8px 0 8px 18px;
}
.io {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 24px;
}

footer {
  padding: 22px 24px 40px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--mute);
  position: relative;
  z-index: 1;
}

@media (max-width: 900px) {
  .fog-glyph { display: none; }
  .sand-hero,
  .buoy-grid,
  .trough,
  .io,
  .wake-pair,
  .wake-pair.flip,
  .bench-desk,
  .value-seats {
    grid-template-columns: 1fr;
  }
  .wake-pair.flip { direction: ltr; }
  .chart-plate img { min-height: 38vh; }
  .cartouche { padding: 24px 20px 32px; }
  .nav-toggle { display: inline-block; }
  .channel-nav {
    display: none;
    position: absolute;
    right: 12px;
    top: 58px;
    flex-direction: column;
    align-items: stretch;
    background: var(--chart-linen);
    padding: 12px;
    min-width: 188px;
    box-shadow: 0 12px 30px rgba(14, 31, 44, 0.16);
    border-top: 3px solid var(--phosphor-wake);
  }
  .channel-nav.open { display: flex; }
  .channel-nav a { color: var(--channel-ink); }
}