/* ═══════════ TIEFE — Designsystem ═══════════
   Farben: Abgrund-Schwarz, Biolumineszenz-Cyan, Tiefen-Violett
   Typo:   Cormorant Garamond (Display) · Inter (Text) · IBM Plex Mono (HUD)
*/
:root {
  --abyss: #02060a;
  --ink: #dff2f6;
  --ink-dim: #8fb4bf;
  --cyan: #6fe3ff;
  --violet: #b48cff;
  --hairline: rgba(140, 220, 240, 0.16);
  --font-display: "Cormorant Garamond", Georgia, serif;
  --font-body: "Inter", -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: auto; }
body {
  background: var(--abyss);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(111, 227, 255, 0.25); }

/* ─── Layer: Shader-Ozean + Partikel ─── */
#ocean, #snow {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
}
#ocean { z-index: 0; }
#snow { z-index: 1; }
#content { position: relative; z-index: 2; }

/* ─── Ladezustand: Sonar ─── */
#loader {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--abyss);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.2rem;
  transition: opacity 0.9s ease, visibility 0.9s;
}
#loader.done { opacity: 0; visibility: hidden; }
.sonar { position: relative; width: 120px; height: 120px; }
.sonar span {
  position: absolute;
  inset: 0;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  opacity: 0;
  animation: ping 2.4s cubic-bezier(0.2, 0.6, 0.4, 1) infinite;
}
.sonar span:nth-child(2) { animation-delay: 0.8s; }
.sonar span:nth-child(3) { animation-delay: 1.6s; }
@keyframes ping {
  0% { transform: scale(0.15); opacity: 0.9; }
  100% { transform: scale(1); opacity: 0; }
}
.loader-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--ink-dim);
  animation: breathe 2.4s ease-in-out infinite;
}
@keyframes breathe { 50% { opacity: 0.4; } }

/* ─── HUD: Tauchcomputer ─── */
#hud {
  position: fixed;
  left: clamp(16px, 3vw, 44px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  font-family: var(--font-mono);
  border-left: 1px solid var(--hairline);
  padding-left: 1.1rem;
  opacity: 0;
  transition: opacity 1.2s ease 0.3s;
}
#hud.on { opacity: 1; }
.hud-label {
  display: block;
  font-size: 0.58rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 0.15rem;
}
.hud-value { font-size: 1.7rem; font-weight: 500; color: var(--cyan); line-height: 1.1; font-variant-numeric: tabular-nums; }
.hud-value small { font-size: 0.85rem; color: var(--ink-dim); }
.hud-mini { font-size: 0.85rem; color: var(--ink); font-variant-numeric: tabular-nums; }
.hud-zone .hud-mini { color: var(--violet); }
.hud-gauge {
  width: 3px;
  height: 110px;
  background: rgba(140, 220, 240, 0.12);
  border-radius: 2px;
  overflow: hidden;
}
#hud-gauge-fill {
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, var(--cyan), var(--violet));
  border-radius: 2px;
}

/* ─── Sound-Toggle ─── */
#sound-toggle {
  position: fixed;
  top: clamp(16px, 3vw, 36px);
  right: clamp(16px, 3vw, 44px);
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  background: rgba(2, 6, 10, 0.45);
  border: 1px solid var(--hairline);
  color: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 0.6rem 1rem;
  border-radius: 100px;
  cursor: pointer;
  backdrop-filter: blur(12px);
  transition: color 0.3s, border-color 0.3s;
}
#sound-toggle:hover { color: var(--ink); border-color: rgba(140, 220, 240, 0.4); }
#sound-toggle[aria-pressed="true"] { color: var(--cyan); border-color: rgba(111, 227, 255, 0.5); }
#sound-toggle .wave { opacity: 0.25; transition: opacity 0.3s; }
#sound-toggle[aria-pressed="true"] .wave { opacity: 1; }
#sound-toggle[aria-pressed="true"] .w1 { animation: breathe 1.6s ease-in-out infinite; }
#sound-toggle[aria-pressed="true"] .w2 { animation: breathe 1.6s ease-in-out 0.4s infinite; }

/* ─── Hero ─── */
.hero {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}
.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-shade {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at center, transparent 30%, rgba(2, 6, 10, 0.55) 100%),
    linear-gradient(to bottom, rgba(2, 6, 10, 0.25), transparent 30%, transparent 70%, var(--abyss) 100%);
}
.hero-inner { position: relative; padding: 0 6vw; }
.hero-inner::before {
  content: '';
  position: absolute;
  inset: -18% -26%;
  background: radial-gradient(ellipse, rgba(2, 6, 10, 0.78), rgba(2, 6, 10, 0.35) 55%, transparent 72%);
  z-index: -1;
}
.overline {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 1.6rem;
}
h1 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(5rem, 17vw, 15rem);
  line-height: 0.95;
  letter-spacing: 0.14em;
  margin-left: 0.14em; /* optischer Ausgleich fürs letter-spacing */
}
.title-word {
  background: linear-gradient(to bottom, #f2fbfd 20%, #9fd8e8 60%, #4e7f94);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 90px rgba(111, 227, 255, 0.35);
}
.hero-sub {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.6;
  color: #c8e2ea;
  margin-top: 1.8rem;
  text-shadow: 0 2px 26px rgba(2, 6, 10, 0.95), 0 0 8px rgba(2, 6, 10, 0.6);
}
.scroll-hint {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.hint-line {
  width: 1px;
  height: 64px;
  background: linear-gradient(to bottom, var(--cyan), transparent);
  animation: sink 2.2s ease-in-out infinite;
  transform-origin: top;
}
@keyframes sink {
  0% { transform: scaleY(0); opacity: 0; }
  40% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(1) translateY(18px); opacity: 0; }
}

/* ─── Zonen ─── */
.zone { position: relative; padding: 22vh 0 20vh; }
/* Weicher Übergang aus dem schwarzen Prolog ins helle Oberflächenwasser */
#zone-licht::before {
  content: '';
  position: absolute;
  top: -2px; left: 0; right: 0;
  height: 55vh;
  background: linear-gradient(to bottom, var(--abyss), transparent);
  pointer-events: none;
}
.zone-head { max-width: 1240px; margin: 0 auto 7vh; padding: 0 6vw 0 clamp(90px, 12vw, 170px); }
.zone-meta {
  display: flex;
  gap: 1.6rem;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: 1.4rem;
}
.zone-no { color: var(--cyan); }
.zone-range { color: var(--ink-dim); }
h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.6rem, 5.5vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: 0.01em;
}
.zone-body {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 6vw 0 clamp(90px, 12vw, 170px);
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: stretch;
}
.zone-text { align-self: center; }
.zone-text p { color: var(--ink-dim); margin-bottom: 1.4rem; max-width: 46ch; }
.zone-text p:last-of-type { margin-bottom: 0; }

.media {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
}
.media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 62vh;
  object-fit: cover;
  transform: scale(1.12); /* Reserve für Parallax */
  will-change: transform;
}
.media-wide img { min-height: 0; height: auto; }
.media figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 2.2rem 1.4rem 1rem;
  background: linear-gradient(to top, rgba(2, 6, 10, 0.85), transparent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--ink-dim);
}
.media-wide { grid-column: 1 / -1; }

.facts {
  display: flex;
  gap: 2.4rem;
  margin-top: 2.2rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--hairline);
}
.facts dt {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 400;
  color: var(--cyan);
  line-height: 1.15;
}
.facts dd {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-top: 0.3rem;
}

/* ─── Scrub-Zone (Mitternacht) ─── */
.scrub-zone { height: 420vh; padding: 0; }
.scrub-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
}
#scrub-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.scrub-shade {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 40%, rgba(2, 6, 10, 0.6) 100%);
}
.scrub-head {
  position: absolute;
  top: clamp(24px, 6vh, 70px);
  left: 0; right: 0;
  margin: 0 auto;
  z-index: 2;
}
.scrub-captions { position: absolute; inset: 0; z-index: 2; pointer-events: none; }
.scrub-caption {
  position: absolute;
  bottom: 14vh;
  left: 50%;
  transform: translate(-50%, 20px);
  width: min(680px, 84vw);
  text-align: center;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.3rem, 2.6vw, 2rem);
  line-height: 1.5;
  color: var(--ink);
  text-shadow: 0 2px 30px rgba(2, 6, 10, 0.9);
  opacity: 0;
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.scrub-caption.on { opacity: 1; transform: translate(-50%, 0); }
.scrub-progress {
  position: absolute;
  bottom: 0;
  left: 0; right: 0;
  height: 2px;
  background: rgba(140, 220, 240, 0.1);
  z-index: 2;
}
#scrub-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(to right, var(--cyan), var(--violet));
}

/* ─── Finale ─── */
.finale {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20vh 6vw 10vh;
}
.finale-number {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(4.5rem, 13vw, 11rem);
  line-height: 1;
  margin: 1.2rem 0 4vh;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 120px rgba(180, 140, 255, 0.3);
}
.finale-number small { font-size: 0.32em; color: var(--ink-dim); }
.finale-text {
  max-width: 56ch;
  color: var(--ink-dim);
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}
.finale-dim {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.5rem;
  color: var(--ink);
  margin-top: 1.2rem;
}
#resurface {
  margin-top: 5vh;
  background: none;
  border: 1px solid var(--hairline);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  padding: 1rem 2.2rem;
  border-radius: 100px;
  cursor: pointer;
  transition: border-color 0.3s, box-shadow 0.3s, color 0.3s;
}
#resurface:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 40px rgba(111, 227, 255, 0.15);
}
.credits {
  margin-top: 12vh;
  padding-top: 2rem;
  border-top: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  line-height: 2;
  color: var(--ink-dim);
}
.asset-strip {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 1.8rem;
}
.asset-strip img {
  width: 76px;
  height: 44px;
  object-fit: cover;
  border-radius: 3px;
  opacity: 0.55;
  filter: saturate(0.9);
  transition: opacity 0.4s, transform 0.4s;
}
.asset-strip img:hover { opacity: 1; transform: translateY(-4px); }
.asset-strip-label { margin-top: 0.7rem; }

/* ─── Reveal-Motion ─── */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 1.1s cubic-bezier(0.16, 1, 0.3, 1), transform 1.1s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.in { opacity: 1; transform: none; }

/* ─── Responsive (Bonus) ─── */
@media (max-width: 900px) {
  .zone-body { grid-template-columns: 1fr; }
  #hud { display: none; }
  .zone-head, .zone-body { padding-left: 6vw; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal { transition: none; opacity: 1; transform: none; }
  .hint-line, .sonar span { animation: none; }
}