@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,300;1,400&family=DM+Mono:wght@300;400&display=swap');

/* ══════════════════════════════════════════
   CSS VARIABLES
══════════════════════════════════════════ */
:root {
  --c0: #b8e4f9;
  --c1: #0096c7;
  --c2: #023e8a;
  --c3: #03045e;
  --c4: #010018;
  --c5: #000000;
  --bio-teal: #00f5d4;
  --bio-pink: #ff006e;
  --bio-violet: #7b2fff;
  --bio-gold: #ffd60a;
  --text: rgba(255, 255, 255, 0.9);
  --dim: rgba(255, 255, 255, 0.38);
  --mono: 'DM Mono', monospace;
  --serif: 'Playfair Display', serif;
}

/* ══════════════════════════════════════════
   RESET & BASE
══════════════════════════════════════════ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: #000;
  color: var(--text);
  font-family: var(--serif);
  overflow-x: hidden;
  cursor: auto;
}

/* ══════════════════════════════════════════
   LOADER
══════════════════════════════════════════ */
#loader {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: #000014;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 1.2s ease, visibility 1.2s;
}

#loader.out {
  opacity: 0;
  visibility: hidden;
}

.ld-sonar {
  width: 120px;
  height: 120px;
  position: relative;
  margin-bottom: 48px;
}

.ld-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid var(--bio-teal);
  animation: sonarPulse 2s ease-out infinite;
  opacity: 0;
}

.ld-ring:nth-child(2) { animation-delay: .6s; }
.ld-ring:nth-child(3) { animation-delay: 1.2s; }

.ld-dot {
  position: absolute;
  inset: 50%;
  width: 10px;
  height: 10px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: var(--bio-teal);
  box-shadow: 0 0 20px var(--bio-teal);
}

@keyframes sonarPulse {
  0%   { transform: scale(.1); opacity: .8; }
  100% { transform: scale(1.8); opacity: 0; }
}

.ld-title {
  font-family: var(--serif);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 400;
  letter-spacing: .18em;
  color: #fff;
  opacity: 0;
  animation: fadeUp .8s .4s forwards;
}

.ld-sub {
  font-family: var(--mono);
  font-size: .55rem;
  letter-spacing: .55em;
  text-transform: uppercase;
  color: var(--bio-teal);
  margin-top: 12px;
  opacity: 0;
  animation: fadeUp .6s .7s forwards;
}

.ld-bar-wrap {
  width: 160px;
  height: 1px;
  background: rgba(255, 255, 255, .08);
  margin-top: 40px;
  overflow: hidden;
  opacity: 0;
  animation: fadeUp .5s 1s forwards;
}

.ld-bar {
  height: 100%;
  background: var(--bio-teal);
  width: 0;
  animation: ldBar 2.4s 1.1s ease-out forwards;
  box-shadow: 0 0 10px var(--bio-teal);
}

@keyframes ldBar { to { width: 100%; } }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ══════════════════════════════════════════
   THREE.JS CANVAS
══════════════════════════════════════════ */
#three-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ══════════════════════════════════════════
   SCROLL CONTAINER & SECTIONS
══════════════════════════════════════════ */
#scroll-container {
  position: relative;
  z-index: 10;
}

section {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 max(6vw, 24px);
  overflow: hidden;
}

/* ══════════════════════════════════════════
   NAV
══════════════════════════════════════════ */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 500;
  padding: 22px max(6vw, 24px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(to bottom, rgba(0, 0, 10, .7), transparent);
}

.nav-brand {
  font-family: var(--mono);
  font-size: .6rem;
  letter-spacing: .5em;
  text-transform: uppercase;
  color: var(--bio-teal);
}

.nav-items {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-items a {
  font-family: var(--mono);
  font-size: .52rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--dim);
  text-decoration: none;
  transition: color .3s;
}

.nav-items a:hover { color: var(--bio-teal); }

/* ══════════════════════════════════════════
   DEPTH HUD (sidebar)
══════════════════════════════════════════ */
#depth-hud {
  position: fixed;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 400;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.dhud-label {
  font-family: var(--mono);
  font-size: .42rem;
  letter-spacing: .35em;
  color: var(--dim);
  writing-mode: vertical-rl;
  text-transform: uppercase;
}

.dhud-line {
  width: 1px;
  height: 100px;
  background: rgba(255, 255, 255, .1);
  position: relative;
  overflow: hidden;
}

.dhud-prog {
  position: absolute;
  bottom: 0; left: 0;
  width: 100%;
  background: var(--bio-teal);
  box-shadow: 0 0 8px var(--bio-teal);
  transition: height .5s ease;
}

.dhud-num {
  font-family: var(--mono);
  font-size: .42rem;
  color: var(--bio-teal);
  letter-spacing: .1em;
}

.dhud-dots {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.dhud-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .15);
  cursor: pointer;
  transition: background .3s, box-shadow .3s;
}

.dhud-dot.active {
  background: var(--bio-teal);
  box-shadow: 0 0 8px var(--bio-teal);
}

/* ══════════════════════════════════════════
   SECTION 1 — HERO
══════════════════════════════════════════ */
#s1 { min-height: 100vh; }

.hero-wrap {
  padding-top: 100px;
  max-width: 900px;
}

.hero-tag {
  font-family: var(--mono);
  font-size: .55rem;
  letter-spacing: .55em;
  text-transform: uppercase;
  color: var(--bio-teal);
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
  opacity: 0;
  animation: fadeUp .7s 3.4s forwards;
}

.hero-tag::before {
  content: '';
  width: 36px;
  height: 1px;
  background: var(--bio-teal);
  box-shadow: 0 0 8px var(--bio-teal);
}

.hero-title {
  font-size: clamp(4.5rem, 12vw, 11rem);
  font-weight: 400;
  line-height: .88;
  letter-spacing: -.02em;
  color: #fff;
  opacity: 0;
  animation: fadeUp 1s 3.6s forwards;
}

.hero-title em {
  font-style: italic;
  color: rgba(255, 255, 255, .35);
  display: block;
}

.hero-body {
  max-width: 480px;
  font-size: 1.1rem;
  line-height: 1.85;
  font-weight: 300;
  color: rgba(255, 255, 255, .65);
  margin-top: 32px;
  opacity: 0;
  animation: fadeUp .8s 3.9s forwards;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: max(6vw, 24px);
  display: flex;
  align-items: center;
  gap: 16px;
  opacity: 0;
  animation: fadeUp .6s 4.3s forwards;
}

.hs-line {
  width: 60px;
  height: 1px;
  background: rgba(255, 255, 255, .3);
  position: relative;
  overflow: hidden;
}

.hs-line::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: var(--bio-teal);
  animation: scanLine 2s 4.5s ease-in-out infinite;
}

@keyframes scanLine {
  0%   { left: -100%; }
  100% { left: 200%; }
}

.hs-text {
  font-family: var(--mono);
  font-size: .48rem;
  letter-spacing: .4em;
  text-transform: uppercase;
  color: var(--dim);
}

.hero-depth-float {
  position: absolute;
  right: 8vw;
  top: 50%;
  transform: translateY(-50%);
  text-align: right;
  pointer-events: none;
  opacity: 0;
  animation: fadeUp .9s 4s forwards;
}

.hdf-num {
  font-family: var(--mono);
  font-size: clamp(4rem, 10vw, 8rem);
  color: rgba(255, 255, 255, .04);
  font-weight: 400;
  line-height: 1;
  display: block;
}

.hdf-label {
  font-family: var(--mono);
  font-size: .5rem;
  letter-spacing: .4em;
  color: rgba(255, 255, 255, .12);
  text-transform: uppercase;
}

/* ══════════════════════════════════════════
   SECTION 2 — SUNLIGHT ZONE
══════════════════════════════════════════ */
#s2 { background: transparent; }

.zone-header { margin-bottom: 16px; }

.zh-number {
  font-family: var(--mono);
  font-size: .5rem;
  letter-spacing: .5em;
  color: var(--bio-teal);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 12px;
}

.zh-number::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--bio-teal);
}

.zh-depth {
  font-family: var(--mono);
  font-size: .48rem;
  color: var(--dim);
  letter-spacing: .3em;
  margin-top: 8px;
}

.zh-name {
  font-size: clamp(2.8rem, 7vw, 6.5rem);
  font-weight: 400;
  font-style: italic;
  line-height: .95;
  margin-top: 14px;
}

.two-col {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 80px;
  align-items: start;
  margin-top: 48px;
}

.section-prose {
  font-size: 1.05rem;
  line-height: 1.9;
  font-weight: 300;
  color: rgba(255, 255, 255, .65);
}

/* Creature cards */
.creature-showcase {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.cc {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 18px 22px;
  background: rgba(255, 255, 255, .03);
  border: 1px solid rgba(255, 255, 255, .06);
  border-radius: 3px;
  cursor: pointer;
  transition: background .3s, border-color .3s, transform .3s;
  position: relative;
  overflow: hidden;
}

.cc::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--bio-teal);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform .4s ease;
}

.cc:hover {
  background: rgba(0, 245, 212, .05);
  border-color: rgba(0, 245, 212, .2);
  transform: translateX(6px);
}

.cc:hover::before { transform: scaleY(1); }

.cc-icon { font-size: 1.8rem; flex-shrink: 0; }

.cc-name {
  font-family: var(--mono);
  font-size: .55rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--bio-teal);
  margin-bottom: 4px;
}

.cc-fact {
  font-size: .85rem;
  color: rgba(255, 255, 255, .5);
  font-weight: 300;
  line-height: 1.5;
}

/* Depth Explorer */
.depth-explorer {
  background: rgba(255, 255, 255, .03);
  border: 1px solid rgba(255, 255, 255, .07);
  border-radius: 4px;
  padding: 32px 28px;
  margin-top: 40px;
}

.de-label {
  font-family: var(--mono);
  font-size: .52rem;
  letter-spacing: .4em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 18px;
  display: block;
}

.de-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 2px;
  background: rgba(255, 255, 255, .1);
  outline: none;
  cursor: pointer;
  border-radius: 2px;
}

.de-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bio-teal);
  box-shadow: 0 0 14px var(--bio-teal);
  cursor: pointer;
  transition: transform .2s;
}

.de-slider::-webkit-slider-thumb:hover { transform: scale(1.3); }

.de-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: none;
  background: var(--bio-teal);
  box-shadow: 0 0 14px var(--bio-teal);
  cursor: pointer;
}

.de-output {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-top: 16px;
}

.de-depth-val {
  font-family: var(--mono);
  font-size: 1.8rem;
  color: #fff;
  font-weight: 400;
  line-height: 1;
}

.de-zone-info { text-align: right; }

.de-zone-name {
  font-family: var(--mono);
  font-size: .58rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  display: block;
  line-height: 1;
  margin-bottom: 4px;
  transition: color .4s;
}

.de-zone-sub {
  font-family: var(--mono);
  font-size: .48rem;
  letter-spacing: .2em;
  color: var(--dim);
  display: block;
}

/* ══════════════════════════════════════════
   SECTION 3 — TWILIGHT ZONE
══════════════════════════════════════════ */
.jelly-wrap {
  position: absolute;
  right: 5vw;
  top: 50%;
  transform: translateY(-45%);
  width: clamp(200px, 28vw, 380px);
  pointer-events: none;
  filter: drop-shadow(0 0 40px rgba(123, 47, 255, .5));
  animation: jellyBob 5s ease-in-out infinite;
}

@keyframes jellyBob {
  0%, 100% { transform: translateY(-45%) rotate(-1deg); }
  50%       { transform: translateY(-55%) rotate(1deg); }
}

.stats-ring {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
}

.sr-item {
  flex: 1;
  min-width: 130px;
  padding: 20px 18px;
  background: rgba(123, 47, 255, .06);
  border: 1px solid rgba(123, 47, 255, .2);
  border-radius: 3px;
  transition: background .3s, box-shadow .3s;
  cursor: default;
}

.sr-item:hover {
  background: rgba(123, 47, 255, .12);
  box-shadow: 0 0 30px rgba(123, 47, 255, .1);
}

.sr-val {
  font-family: var(--mono);
  font-size: 1.6rem;
  color: #c77dff;
  font-weight: 400;
  display: block;
  line-height: 1;
  margin-bottom: 6px;
}

.sr-lbl {
  font-family: var(--mono);
  font-size: .48rem;
  letter-spacing: .25em;
  color: var(--dim);
  text-transform: uppercase;
}

/* ══════════════════════════════════════════
   SECTION 4 — MIDNIGHT ZONE
══════════════════════════════════════════ */
.angler-wrap {
  position: absolute;
  right: 4vw;
  top: 50%;
  transform: translateY(-50%);
  width: clamp(180px, 24vw, 320px);
  pointer-events: none;
  animation: anglerDrift 7s ease-in-out infinite;
}

@keyframes anglerDrift {
  0%, 100% { transform: translateY(-50%) translateX(0); }
  50%       { transform: translateY(-60%) translateX(10px); }
}

.bio-scroll {
  display: flex;
  gap: 18px;
  margin-top: 48px;
  overflow-x: auto;
  padding-bottom: 12px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 0, 110, .3) transparent;
}

.bio-scroll::-webkit-scrollbar { height: 2px; }
.bio-scroll::-webkit-scrollbar-thumb { background: rgba(255, 0, 110, .3); }

.bcard {
  flex-shrink: 0;
  width: 220px;
  padding: 28px 22px;
  background: rgba(255, 0, 110, .04);
  border: 1px solid rgba(255, 0, 110, .12);
  border-radius: 3px;
  cursor: pointer;
  transition: border-color .3s, box-shadow .3s, transform .3s;
  position: relative;
  overflow: hidden;
}

.bcard:hover {
  border-color: rgba(255, 0, 110, .4);
  box-shadow: 0 0 40px rgba(255, 0, 110, .1);
  transform: translateY(-6px);
}

.bcard-glow {
  position: absolute;
  top: -40px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--bio-pink), transparent 70%);
  opacity: 0;
  transition: opacity .4s;
  filter: blur(20px);
}

.bcard:hover .bcard-glow { opacity: .6; }

.bcard-icon {
  font-size: 2.4rem;
  display: block;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 8px rgba(255, 0, 110, .6));
}

.bcard-name {
  font-family: var(--mono);
  font-size: .55rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--bio-pink);
  margin-bottom: 10px;
}

.bcard-text {
  font-size: .88rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, .5);
  font-weight: 300;
}

/* ══════════════════════════════════════════
   SECTION 5 — HADAL ZONE
══════════════════════════════════════════ */
#s5 {
  text-align: center;
  align-items: center;
}

.hadal-content {
  max-width: 760px;
  width: 100%;
}

.trench-diagram {
  width: 100%;
  max-width: 580px;
  margin: 0 auto 50px;
}

.hadal-quote {
  font-size: clamp(1.6rem, 4vw, 3.2rem);
  font-style: italic;
  font-weight: 300;
  line-height: 1.38;
  color: rgba(255, 255, 255, .88);
  margin-bottom: 24px;
  position: relative;
}

.hadal-quote::before {
  content: '"';
  position: absolute;
  top: -.4em; left: -.2em;
  font-size: 5em;
  color: rgba(0, 245, 212, .07);
  line-height: 1;
}

.hadal-by {
  font-family: var(--mono);
  font-size: .52rem;
  letter-spacing: .45em;
  color: var(--dim);
  text-transform: uppercase;
  margin-bottom: 60px;
}

.h-counters {
  display: flex;
  justify-content: center;
  gap: 56px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hc { text-align: center; }

.hc-val {
  font-family: var(--mono);
  font-size: clamp(1.8rem, 5vw, 3.4rem);
  color: var(--bio-teal);
  display: block;
  line-height: 1;
  margin-bottom: 8px;
}

.hc-lbl {
  font-family: var(--mono);
  font-size: .48rem;
  letter-spacing: .3em;
  color: var(--dim);
  text-transform: uppercase;
}

.resurface-btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 16px 44px;
  border: 1px solid rgba(0, 245, 212, .35);
  border-radius: 2px;
  background: transparent;
  color: var(--bio-teal);
  font-family: var(--mono);
  font-size: .6rem;
  letter-spacing: .45em;
  text-transform: uppercase;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: color .4s, box-shadow .4s;
}

.resurface-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--bio-teal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s ease;
}

.resurface-btn:hover::after { transform: scaleX(1); }

.resurface-btn:hover {
  color: #000;
  box-shadow: 0 0 50px rgba(0, 245, 212, .25);
}

.resurface-btn span { position: relative; z-index: 1; }

/* ══════════════════════════════════════════
   SCROLL REVEAL UTILITIES
══════════════════════════════════════════ */
.rx   { opacity: 0; transform: translateY(36px);  transition: opacity .9s ease, transform .9s ease; }
.rx-l { opacity: 0; transform: translateX(-36px); transition: opacity .9s ease, transform .9s ease; }
.rx-r { opacity: 0; transform: translateX(36px);  transition: opacity .9s ease, transform .9s ease; }

.rx.vis, .rx-l.vis, .rx-r.vis {
  opacity: 1;
  transform: none;
}

.d1 { transition-delay: .12s; }
.d2 { transition-delay: .24s; }
.d3 { transition-delay: .36s; }
.d4 { transition-delay: .48s; }
.d5 { transition-delay: .60s; }
.d6 { transition-delay: .72s; }

/* ══════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════ */
@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; gap: 44px; }
  .jelly-wrap,
  .angler-wrap {
    position: relative;
    right: auto; top: auto;
    transform: none;
    width: 60%;
    margin: 32px auto 0;
    animation: none;
  }
  .nav-items  { display: none; }
  #depth-hud  { display: none; }
}

@media (max-width: 580px) {
  .h-counters   { gap: 28px; }
  .bio-scroll   { gap: 12px; }
  .bcard        { width: 180px; }
  section       { padding: 0 5vw; }
  #s5           { padding: 80px 5vw; }
}