:root {
  --surface: #14405a;
  --abyss: #03080c;
  --ink: #dbe9ec;
  --text: #a9c2ca;
  --muted: #6f8d99;
  --teal: #3fd6c6;
  --brass: #d9a55b;
  --brass-hi: #f1d29a;
  --brass-lo: #8a6a3c;
  --line: rgba(217, 165, 91, .35);
  --serif: "EB Garamond", "Iowan Old Style", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;
}

* { box-sizing: border-box; }
html { background: #0b1620; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
  margin: 0;
  background: #0b1620;
  color: var(--text);
  font: 400 1.25rem/1.65 var(--serif);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

#ocean { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; display: block; }
main { position: relative; z-index: 1; padding-inline: 18px; }
@media (min-width: 820px) { main { padding-inline: 200px; } }

h1, h2, h3 { color: var(--ink); font-weight: 500; margin: 0; line-height: 1.1; }
p { margin: 0; text-shadow: 0 1px 14px rgba(0, 0, 0, .55); }
a { color: inherit; }
a:focus-visible { outline: 2px solid var(--teal); outline-offset: 4px; border-radius: 2px; }

.eyebrow, .hint, .depth-tag, .cat, .chips, .descend, .colophon, .hud {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: .18em;
  font-size: .7rem;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  place-content: center;
  justify-items: center;
  text-align: center;
  gap: 1.1rem;
  padding: 18vh 0 26vh;
}
.eyebrow { color: var(--teal); opacity: .8; }
h1 {
  font-size: clamp(3.2rem, 10vw, 7rem);
  letter-spacing: .015em;
  background: linear-gradient(180deg, var(--brass-hi), var(--brass) 55%, var(--brass-lo));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 4px 24px rgba(217, 165, 91, .18));
}
.motto { font-style: italic; color: var(--teal); font-size: 1.5rem; letter-spacing: .04em; }
.lede { max-width: 34rem; color: var(--text); }
.hint { color: var(--muted); opacity: .7; margin-top: .4rem; }

.descend {
  display: inline-block;
  margin-top: 1.2rem;
  color: var(--brass);
  text-decoration: none;
  padding: .6rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color .3s, border-color .3s, background .3s;
}
.descend:hover { color: var(--teal); border-color: rgba(63, 214, 198, .5); background: rgba(63, 214, 198, .06); }

.voyage {
  position: absolute;
  left: -18px; right: -18px;
  bottom: 7vh;
  height: clamp(70px, 14vw, 130px);
  overflow: hidden;
  pointer-events: none;
}
@media (min-width: 820px) { .voyage { left: -200px; right: -200px; } }
.nautilus {
  position: absolute;
  left: 0; bottom: 0;
  height: 100%;
  animation: cruise 80s linear -30s infinite;
  filter: drop-shadow(0 0 18px rgba(63, 214, 198, .12));
}
.nautilus .bob { animation: bob 7s ease-in-out infinite alternate; }
.nautilus .prop { transform-box: fill-box; transform-origin: center; animation: spin .35s linear infinite alternate; }
.nautilus .beam { animation: flicker 5s ease-in-out infinite alternate; }
@keyframes cruise { from { transform: translateX(-100%); } to { transform: translateX(100vw); } }
@keyframes bob { from { transform: translateY(-3px); } to { transform: translateY(4px); } }
@keyframes spin { from { transform: scaleY(1); } to { transform: scaleY(.15); } }
@keyframes flicker { from { opacity: .75; } to { opacity: 1; } }

/* ---------- Log sections ---------- */
.log, .seafloor {
  min-height: 115vh;
  max-width: 40rem;
  margin: 0 auto;
  display: grid;
  align-content: center;
  gap: 1.3rem;
}
.log.wide { max-width: 66rem; }
.depth-tag { color: var(--teal); opacity: .85; }
.depth-tag::before { content: "— "; color: var(--brass); }
h2 { font-size: clamp(2rem, 5vw, 2.9rem); }
.numeral { color: var(--brass); font-style: italic; margin-right: .3em; }

.chips { list-style: none; padding: 0; margin: .4rem 0 0; display: flex; flex-wrap: wrap; gap: .55rem; }
.chips li {
  color: var(--teal);
  border: 1px solid rgba(63, 214, 198, .3);
  background: rgba(6, 16, 22, .45);
  border-radius: 999px;
  padding: .4rem .85rem;
}

/* ---------- Specimen labels ---------- */
.specimens {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 1.4rem;
  margin-top: 1rem;
}
.specimen {
  position: relative;
  padding: 1.5rem 1.4rem 1.6rem;
  background: rgba(6, 16, 22, .62);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  border: 1px solid var(--line);
  outline: 1px solid rgba(217, 165, 91, .12);
  outline-offset: 5px;
  display: grid;
  gap: .35rem;
  transition: transform .4s, border-color .4s;
}
.specimen:hover { transform: translateY(-3px); border-color: var(--brass); }
.specimen svg { width: 44px; height: 44px; fill: none; stroke: var(--brass); stroke-width: 1.4; margin-bottom: .5rem; }
.specimen svg text { fill: var(--brass); stroke: none; font: 500 13px var(--mono); }
.cat { color: var(--muted); font-size: .64rem; }
.specimen h3 { font-size: 1.65rem; }
.latin { font-style: italic; color: var(--teal); margin-bottom: .5rem; }
.specimen p:last-child { font-size: 1.08rem; line-height: 1.55; }
.specimen.pending { border-style: dashed; opacity: .78; }

/* ---------- Seafloor ---------- */
.seafloor { min-height: 100vh; align-content: end; justify-items: center; text-align: center; padding-bottom: max(14vh, 250px); }
.colophon { color: var(--muted); margin-top: 3rem; letter-spacing: .14em; }
.colophon i { font-family: var(--serif); text-transform: none; font-size: .95rem; letter-spacing: .02em; }

/* ---------- HUD ---------- */
.hud {
  position: fixed;
  z-index: 2;
  left: 28px; top: 50%;
  transform: translateY(-50%);
  display: flex;
  gap: 16px;
  align-items: stretch;
  color: var(--muted);
  pointer-events: none;
}
.gauge { position: relative; width: 16px; height: 44vh; }
.gauge-track {
  position: absolute; left: 7px; top: 0; bottom: 0; width: 9px;
  border-left: 1px solid var(--line);
  background: repeating-linear-gradient(to bottom, rgba(217, 165, 91, .55) 0 1px, transparent 1px 10%);
}
.gauge-needle { position: absolute; left: 0; top: 0; width: 18px; height: 2px; background: var(--brass); box-shadow: 0 0 10px var(--brass); }
.gauge-needle span { position: absolute; left: -7px; top: -4px; border: 5px solid transparent; border-left: 6px solid var(--brass-hi); }
.readout { margin: 0; display: grid; align-content: center; gap: .85rem; }
.readout dt { font-size: .6rem; letter-spacing: .22em; }
.readout dd { margin: .1rem 0 0; color: var(--ink); font-size: .8rem; letter-spacing: .08em; text-transform: none; }
.readout b { font-weight: 500; color: var(--teal); font-variant-numeric: tabular-nums; }
.readout .zone dd { color: var(--brass); text-transform: uppercase; font-size: .66rem; letter-spacing: .16em; }

@media (max-width: 819px) {
  .hud { top: 12px; right: 12px; left: auto; transform: none; }
  .gauge, .readout dt, .readout > div:nth-child(2), .readout > div:nth-child(4) { display: none; }
  .readout {
    display: flex; gap: .9rem; align-items: center;
    background: rgba(6, 14, 20, .72);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: .45rem .95rem;
  }
  .readout dd { margin: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .nautilus, .nautilus .bob, .nautilus .prop, .nautilus .beam { animation: none; }
  .nautilus { left: 50%; transform: translateX(-50%); }
}