/* ============================================
   BRYZA — Living Ocean Observatory
   Color System & Design Tokens
   ============================================ */

:root {
  --abyss-blue: #07131F;
  --biolum-cyan: #19E3D5;
  --deep-void: #02070D;
  --text-light: #EAF7FF;
  --current-blue: #5B8CFF;
  --coral-amber: #E8A87C;
  --deep-teal: #0D4D4A;
  --jellyfish-violet: #9B7FD4;
  --seafoam-silver: #B8D4E3;

  --font-heading: 'Fraunces', 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Inter', 'Source Sans 3', system-ui, sans-serif;

  --depth-progress: 0;
  --section-padding: clamp(4rem, 12vh, 10rem);
  --transition-fluid: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-weight: 300;
  color: var(--text-light);
  background: var(--deep-void);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 10000;
  padding: 0.75rem 1.5rem;
  background: var(--biolum-cyan);
  color: var(--deep-void);
  text-decoration: none;
  font-weight: 500;
  border-radius: 4px;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 1rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Master Canvas */
#oceanCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.depth-overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(ellipse at 50% 0%, transparent 0%, var(--deep-void) 100%);
  opacity: calc(var(--depth-progress) * 0.6);
  transition: opacity 0.1s linear;
}

/* Shell Navigation */
.shell-nav-trigger {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  width: 48px;
  height: 48px;
  border: none;
  background: rgba(7, 19, 31, 0.7);
  backdrop-filter: blur(12px);
  border-radius: 50%;
  cursor: pointer;
  color: var(--biolum-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.4s var(--transition-fluid), box-shadow 0.4s;
  box-shadow: 0 0 20px rgba(25, 227, 213, 0.2);
}

.shell-nav-trigger:hover,
.shell-nav-trigger:focus-visible {
  transform: scale(1.1);
  box-shadow: 0 0 30px rgba(25, 227, 213, 0.4);
  outline: 2px solid var(--biolum-cyan);
  outline-offset: 3px;
}

.shell-nav-trigger[aria-expanded="true"] {
  opacity: 0;
  pointer-events: none;
}

.shell-icon {
  width: 28px;
  height: 28px;
}

/* Circular Ocean Nav */
.ocean-nav {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(2, 7, 13, 0.85);
  backdrop-filter: blur(20px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s, visibility 0.5s;
}

.ocean-nav[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.ocean-nav__ring {
  position: relative;
  width: min(90vw, 420px);
  height: min(90vw, 420px);
  border-radius: 50%;
  border: 1px solid rgba(25, 227, 213, 0.2);
  animation: navRingPulse 4s ease-in-out infinite;
}

@keyframes navRingPulse {
  0%, 100% { box-shadow: 0 0 40px rgba(25, 227, 213, 0.1); }
  50% { box-shadow: 0 0 80px rgba(25, 227, 213, 0.25); }
}

.ocean-nav__item {
  position: absolute;
  color: var(--text-light);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: clamp(0.9rem, 2.5vw, 1.1rem);
  padding: 0.75rem 1.25rem;
  border-radius: 2rem;
  background: rgba(7, 19, 31, 0.6);
  border: 1px solid rgba(25, 227, 213, 0.15);
  transition: all 0.3s var(--transition-fluid);
  white-space: nowrap;
}

.ocean-nav__item:hover,
.ocean-nav__item:focus-visible {
  color: var(--biolum-cyan);
  border-color: var(--biolum-cyan);
  box-shadow: 0 0 20px rgba(25, 227, 213, 0.3);
  transform: scale(1.05);
  outline: none;
}

.ocean-nav__item:nth-child(1) { top: 5%; left: 50%; transform: translateX(-50%); }
.ocean-nav__item:nth-child(2) { top: 22%; right: 5%; }
.ocean-nav__item:nth-child(3) { bottom: 22%; right: 5%; }
.ocean-nav__item:nth-child(4) { bottom: 5%; left: 50%; transform: translateX(-50%); }
.ocean-nav__item:nth-child(5) { bottom: 22%; left: 5%; }
.ocean-nav__item:nth-child(6) { top: 22%; left: 5%; }

.ocean-nav__item:nth-child(1):hover { transform: translateX(-50%) scale(1.05); }
.ocean-nav__item:nth-child(4):hover { transform: translateX(-50%) scale(1.05); }

.ocean-nav__close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  color: var(--text-light);
  font-size: 2rem;
  cursor: pointer;
  border-radius: 50%;
  transition: color 0.3s, transform 0.3s;
}

.ocean-nav__close:hover,
.ocean-nav__close:focus-visible {
  color: var(--biolum-cyan);
  transform: rotate(90deg);
  outline: 2px solid var(--biolum-cyan);
}

/* Main Content */
main {
  position: relative;
  z-index: 2;
}

.ocean-section {
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--section-padding) clamp(1.5rem, 5vw, 4rem);
}

.section-inner {
  width: 100%;
  max-width: 1200px;
  position: relative;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
  color: var(--text-light);
  text-shadow: 0 0 40px rgba(25, 227, 213, 0.15);
}

.section-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--seafoam-silver);
  margin-bottom: 3rem;
  opacity: 0.85;
}

/* ============================================
   SECTION 1 — SURFACE
   ============================================ */
.section-surface {
  min-height: 120vh;
  padding: 0;
  align-items: flex-start;
}

.section-surface .section-inner {
  height: 120vh;
  max-width: none;
}

.surface-horizon {
  position: absolute;
  top: 35%;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(184, 212, 227, 0.4) 20%,
    rgba(234, 247, 255, 0.6) 50%,
    rgba(184, 212, 227, 0.4) 80%,
    transparent 100%
  );
  box-shadow: 0 0 60px rgba(234, 247, 255, 0.15);
}

.surface-ripples {
  position: absolute;
  top: 35%;
  left: 0;
  right: 0;
  height: 40%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 8px,
    rgba(25, 227, 213, 0.03) 8px,
    rgba(25, 227, 213, 0.03) 9px
  );
  animation: rippleDrift 8s ease-in-out infinite;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.6) 0%, transparent 100%);
}

@keyframes rippleDrift {
  0%, 100% { transform: translateY(0) scaleY(1); }
  50% { transform: translateY(4px) scaleY(1.02); }
}

/* ============================================
   SECTION 2 — CURRENT FIELDS
   ============================================ */
.section-currents {
  background: linear-gradient(180deg,
    rgba(7, 19, 31, 0.3) 0%,
    rgba(7, 19, 31, 0.8) 100%
  );
}

.current-streams {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
}

.current-item {
  position: relative;
  padding: 1.5rem 2rem;
  background: rgba(7, 19, 31, 0.5);
  border-left: 2px solid var(--biolum-cyan);
  border-radius: 0 8px 8px 0;
  transform: translateX(calc(var(--offset, 0) * 1px));
  transition: transform 0.6s var(--transition-fluid), box-shadow 0.4s;
  cursor: default;
  animation: currentFloat 6s ease-in-out infinite;
  animation-delay: calc(var(--i, 0) * 0.8s);
}

.current-item:nth-child(odd) { --offset: -20; margin-left: 0; margin-right: auto; max-width: 85%; }
.current-item:nth-child(even) { --offset: 20; margin-left: auto; margin-right: 0; max-width: 85%; border-left: none; border-right: 2px solid var(--current-blue); border-radius: 8px 0 0 8px; }

.current-item:nth-child(1) { --i: 0; }
.current-item:nth-child(2) { --i: 1; }
.current-item:nth-child(3) { --i: 2; }
.current-item:nth-child(4) { --i: 3; }
.current-item:nth-child(5) { --i: 4; }
.current-item:nth-child(6) { --i: 5; }

@keyframes currentFloat {
  0%, 100% { transform: translateX(calc(var(--offset, 0) * 1px)) translateY(0); }
  50% { transform: translateX(calc(var(--offset, 0) * 1px + 15px)) translateY(-8px); }
}

.current-item:hover,
.current-item:focus-visible {
  box-shadow: 0 0 30px rgba(25, 227, 213, 0.2);
  outline: none;
}

.current-label {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--biolum-cyan);
  margin-bottom: 0.5rem;
}

.current-text {
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  color: var(--seafoam-silver);
  line-height: 1.8;
}

/* ============================================
   SECTION 3 — CORAL CITIES
   ============================================ */
.section-coral {
  background: linear-gradient(180deg,
    rgba(13, 77, 74, 0.2) 0%,
    rgba(7, 19, 31, 0.9) 100%
  );
}

.coral-ecosystem {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.5rem;
  margin-top: 2rem;
}

.coral-formation {
  position: relative;
  padding: 2rem 1.5rem 1.5rem;
  background: rgba(7, 19, 31, 0.6);
  border-radius: 12px;
  border: 1px solid rgba(232, 168, 124, 0.15);
  transition: transform 0.5s var(--transition-fluid), border-color 0.4s;
  overflow: hidden;
}

.coral-formation:hover {
  transform: translateY(-8px);
  border-color: rgba(232, 168, 124, 0.4);
}

.coral-visual {
  width: 100%;
  height: 120px;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
}

.coral-visual--branching {
  background: linear-gradient(180deg, var(--deep-teal) 0%, var(--coral-amber) 100%);
  clip-path: polygon(50% 0%, 30% 40%, 10% 60%, 25% 80%, 50% 100%, 75% 80%, 90% 60%, 70% 40%);
  opacity: 0.7;
}

.coral-visual--plate {
  background: linear-gradient(135deg, var(--coral-amber) 0%, var(--deep-teal) 100%);
  clip-path: polygon(20% 100%, 0% 40%, 30% 0%, 70% 0%, 100% 40%, 80% 100%);
  opacity: 0.7;
}

.coral-visual--fan {
  background: radial-gradient(ellipse at bottom, var(--coral-amber), var(--jellyfish-violet));
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
  opacity: 0.6;
}

.coral-visual--mound {
  background: linear-gradient(0deg, var(--deep-teal), var(--coral-amber));
  border-radius: 50% 50% 20% 20% / 60% 60% 40% 40%;
  opacity: 0.7;
}

.coral-formation h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: var(--coral-amber);
  margin-bottom: 0.75rem;
}

.coral-formation p {
  font-size: 0.95rem;
  color: var(--seafoam-silver);
  opacity: 0.9;
}

/* ============================================
   SECTION 4 — MIGRATION
   ============================================ */
.section-migration {
  min-height: 110vh;
}

.migration-map {
  position: relative;
  min-height: 60vh;
  border-radius: 16px;
  overflow: hidden;
  background: rgba(7, 19, 31, 0.5);
  border: 1px solid rgba(91, 140, 255, 0.15);
}

#migrationCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.migration-stories {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
  margin-top: 2rem;
}

.migration-story {
  padding: 1.25rem;
  background: rgba(2, 7, 13, 0.7);
  border-radius: 8px;
  border: 1px solid rgba(91, 140, 255, 0.2);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.migration-story:hover {
  border-color: var(--current-blue);
  box-shadow: 0 0 25px rgba(91, 140, 255, 0.15);
}

.migration-story h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--current-blue);
  margin-bottom: 0.5rem;
}

.migration-story p {
  font-size: 0.9rem;
  color: var(--seafoam-silver);
}

/* ============================================
   SECTION 5 — KELP FOREST
   ============================================ */
.section-kelp {
  min-height: 110vh;
  overflow: hidden;
}

.kelp-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.6;
}

.kelp-forest {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 3rem;
  padding: 2rem 0;
}

.kelp-organism {
  position: relative;
  max-width: 500px;
  padding: 1.5rem 2rem;
  background: rgba(13, 77, 74, 0.3);
  border-radius: 0 20px 20px 0;
  border-left: 3px solid var(--deep-teal);
  transition: transform 0.5s, box-shadow 0.4s;
}

.kelp-organism:nth-child(even) {
  margin-left: auto;
  border-left: none;
  border-right: 3px solid var(--deep-teal);
  border-radius: 20px 0 0 20px;
}

.kelp-organism:hover,
.kelp-organism:focus-visible {
  transform: translateX(10px);
  box-shadow: 0 0 30px rgba(13, 77, 74, 0.4);
  outline: none;
}

.kelp-organism:nth-child(even):hover {
  transform: translateX(-10px);
}

.organism-glow {
  position: absolute;
  top: 50%;
  left: -20px;
  width: 8px;
  height: 8px;
  background: var(--biolum-cyan);
  border-radius: 50%;
  box-shadow: 0 0 20px var(--biolum-cyan);
  transform: translateY(-50%);
  animation: organismPulse 3s ease-in-out infinite;
}

.kelp-organism:nth-child(even) .organism-glow {
  left: auto;
  right: -20px;
}

@keyframes organismPulse {
  0%, 100% { opacity: 0.6; transform: translateY(-50%) scale(1); }
  50% { opacity: 1; transform: translateY(-50%) scale(1.5); }
}

.kelp-organism p {
  color: var(--seafoam-silver);
  font-size: 1rem;
}

/* ============================================
   SECTION 6 — MIDNIGHT ZONE
   ============================================ */
.section-midnight {
  background: linear-gradient(180deg,
    rgba(7, 19, 31, 0.95) 0%,
    rgba(2, 7, 13, 1) 100%
  );
}

.biolum-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
}

.biolum-creature {
  position: relative;
  padding: 2rem 1.5rem;
  text-align: center;
  background: rgba(7, 19, 31, 0.8);
  border-radius: 16px;
  border: 1px solid rgba(155, 127, 212, 0.1);
  transition: border-color 0.4s, transform 0.4s;
  cursor: default;
}

.biolum-creature:hover,
.biolum-creature:focus-visible {
  border-color: rgba(155, 127, 212, 0.5);
  transform: scale(1.03);
  outline: none;
}

.creature-glow {
  width: 60px;
  height: 60px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  animation: biolumPulse 3s ease-in-out infinite;
}

.creature-glow--jelly {
  background: radial-gradient(circle, var(--jellyfish-violet), transparent 70%);
  box-shadow: 0 0 40px var(--jellyfish-violet);
}

.creature-glow--angler {
  background: radial-gradient(circle, var(--biolum-cyan), transparent 70%);
  box-shadow: 0 0 40px var(--biolum-cyan);
  animation-delay: 0.5s;
}

.creature-glow--squid {
  background: radial-gradient(circle, var(--current-blue), transparent 70%);
  box-shadow: 0 0 40px var(--current-blue);
  animation-delay: 1s;
}

.creature-glow--bacteria {
  background: radial-gradient(circle, var(--biolum-cyan), var(--jellyfish-violet) 50%, transparent 70%);
  box-shadow: 0 0 40px var(--biolum-cyan);
  animation-delay: 1.5s;
}

@keyframes biolumPulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.15); }
}

.biolum-creature h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: var(--text-light);
  margin-bottom: 0.75rem;
}

.biolum-creature p {
  font-size: 0.9rem;
  color: var(--seafoam-silver);
  opacity: 0.85;
}

/* ============================================
   SECTION 7 — ABYSSAL ARCHIVE
   ============================================ */
.section-archive {
  min-height: 110vh;
}

.archive-chamber {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2.5rem;
  perspective: 1000px;
}

.archive-artifact {
  position: relative;
  padding: 2rem;
  background: rgba(7, 19, 31, 0.7);
  border-radius: 12px;
  border: 1px solid rgba(184, 212, 227, 0.1);
  transition: transform 0.6s var(--transition-fluid), box-shadow 0.4s;
  animation: artifactFloat 8s ease-in-out infinite;
}

.archive-artifact:nth-child(1) { animation-delay: 0s; }
.archive-artifact:nth-child(2) { animation-delay: 2s; }
.archive-artifact:nth-child(3) { animation-delay: 4s; }
.archive-artifact:nth-child(4) { animation-delay: 6s; }

@keyframes artifactFloat {
  0%, 100% { transform: translateY(0) rotateX(0deg); }
  50% { transform: translateY(-12px) rotateX(2deg); }
}

.archive-artifact:hover,
.archive-artifact:focus-visible {
  box-shadow: 0 0 40px rgba(184, 212, 227, 0.1);
  outline: none;
}

.artifact-shape {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  opacity: 0.6;
}

.artifact-shape--vessel {
  background: linear-gradient(135deg, var(--coral-amber), var(--seafoam-silver));
  clip-path: polygon(30% 0%, 70% 0%, 85% 100%, 15% 100%);
}

.artifact-shape--compass {
  border: 3px solid var(--seafoam-silver);
  border-radius: 50%;
  position: relative;
}

.artifact-shape--compass::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 2px;
  height: 50%;
  background: var(--coral-amber);
  transform: translate(-50%, -100%) rotate(30deg);
  transform-origin: bottom center;
}

.artifact-shape--book {
  background: var(--seafoam-silver);
  border-radius: 2px 8px 8px 2px;
  box-shadow: inset -4px 0 0 var(--coral-amber);
}

.artifact-shape--anchor {
  background: var(--seafoam-silver);
  clip-path: polygon(50% 0%, 60% 30%, 80% 30%, 80% 50%, 50% 100%, 20% 50%, 20% 30%, 40% 30%);
}

.archive-artifact h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--seafoam-silver);
  margin-bottom: 0.75rem;
  text-align: center;
}

.archive-artifact p {
  font-size: 0.9rem;
  color: var(--seafoam-silver);
  opacity: 0.8;
  text-align: center;
}

/* ============================================
   SECTION 8 — WHALE CHAMBER
   ============================================ */
.section-whale {
  min-height: 120vh;
}

.whale-sanctuary {
  position: relative;
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#whaleCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.whale-song-waves {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.song-wave {
  position: absolute;
  border: 1px solid rgba(91, 140, 255, 0.3);
  border-radius: 50%;
  animation: songWaveExpand 4s ease-out infinite;
}

@keyframes songWaveExpand {
  0% { width: 20px; height: 20px; opacity: 0.8; }
  100% { width: 600px; height: 600px; opacity: 0; }
}

.whale-info {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  width: 100%;
  margin-top: 3rem;
}

.song-reveal {
  padding: 1.5rem;
  background: rgba(2, 7, 13, 0.8);
  border-radius: 12px;
  border: 1px solid rgba(91, 140, 255, 0.2);
  transition: box-shadow 0.4s;
}

.song-reveal:hover,
.song-reveal:focus-visible {
  box-shadow: 0 0 40px rgba(91, 140, 255, 0.2);
  outline: none;
}

.song-reveal h3 {
  font-family: var(--font-heading);
  color: var(--current-blue);
  margin-bottom: 0.75rem;
}

.song-reveal p {
  color: var(--seafoam-silver);
  font-size: 0.95rem;
}

/* ============================================
   SECTION 9 — CITY OF LIGHT
   ============================================ */
.section-light-city {
  min-height: 120vh;
  overflow: hidden;
}

.light-metropolis {
  position: relative;
  min-height: 60vh;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-end;
  gap: 1rem;
  padding: 3rem 0;
}

.light-structure {
  width: clamp(40px, 8vw, 80px);
  height: clamp(120px, 25vh, 280px);
  background: linear-gradient(180deg,
    rgba(25, 227, 213, 0.8) 0%,
    rgba(155, 127, 212, 0.4) 50%,
    rgba(25, 227, 213, 0.2) 100%
  );
  border-radius: 4px 4px 0 0;
  box-shadow: 0 0 30px rgba(25, 227, 213, 0.3);
  animation: structureGlow 3s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}

@keyframes structureGlow {
  0%, 100% { opacity: 0.6; filter: brightness(1); }
  50% { opacity: 1; filter: brightness(1.3); }
}

.light-district {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.light-node {
  padding: 1.5rem;
  background: rgba(7, 19, 31, 0.7);
  border: 1px solid rgba(25, 227, 213, 0.2);
  border-radius: 12px;
  transition: border-color 0.4s, transform 0.4s;
}

.light-node:hover,
.light-node:focus-visible {
  border-color: var(--biolum-cyan);
  transform: translateY(-4px);
  outline: none;
}

.light-node h3 {
  font-family: var(--font-heading);
  color: var(--biolum-cyan);
  margin-bottom: 0.75rem;
}

.light-node p {
  color: var(--seafoam-silver);
  font-size: 0.95rem;
}

/* ============================================
   SECTION 10 — HEART OF THE OCEAN
   ============================================ */
.section-heart {
  min-height: 100vh;
  text-align: center;
}

.heart-chamber {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.tidal-core {
  position: relative;
  width: 200px;
  height: 200px;
  margin-bottom: 2rem;
}

.core-sphere {
  position: absolute;
  inset: 20%;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%,
    var(--biolum-cyan),
    var(--current-blue) 40%,
    var(--jellyfish-violet) 70%,
    var(--deep-void) 100%
  );
  box-shadow:
    0 0 60px rgba(25, 227, 213, 0.5),
    0 0 120px rgba(91, 140, 255, 0.3),
    inset 0 0 40px rgba(25, 227, 213, 0.3);
  animation: corePulse 4s ease-in-out infinite;
}

@keyframes corePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.core-rings span {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(25, 227, 213, 0.2);
  border-radius: 50%;
  animation: coreRingExpand 6s ease-out infinite;
}

.core-rings span:nth-child(2) { animation-delay: 2s; }
.core-rings span:nth-child(3) { animation-delay: 4s; }

@keyframes coreRingExpand {
  0% { transform: scale(0.8); opacity: 0.8; }
  100% { transform: scale(2); opacity: 0; }
}

.heart-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  font-weight: 400;
  font-style: italic;
  color: var(--text-light);
  max-width: 700px;
  line-height: 1.4;
  text-shadow: 0 0 60px rgba(25, 227, 213, 0.2);
}

.heart-core-label {
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--biolum-cyan);
  opacity: 0.7;
}

.descend-btn {
  margin-top: 2rem;
  padding: 1.25rem 3rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--deep-void);
  background: linear-gradient(135deg, var(--biolum-cyan), var(--current-blue));
  border: none;
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.4s, box-shadow 0.4s;
}

.descend-btn:hover,
.descend-btn:focus-visible {
  transform: scale(1.05);
  box-shadow: 0 0 50px rgba(25, 227, 213, 0.5);
  outline: 2px solid var(--biolum-cyan);
  outline-offset: 4px;
}

.descend-btn.wave-active {
  animation: btnWave 0.8s ease-out;
}

@keyframes btnWave {
  0% { box-shadow: 0 0 0 0 rgba(25, 227, 213, 0.6); }
  100% { box-shadow: 0 0 0 80px rgba(25, 227, 213, 0); }
}

/* Global wave effect on hover */
.ocean-wave {
  position: fixed;
  border-radius: 50%;
  border: 2px solid rgba(25, 227, 213, 0.4);
  pointer-events: none;
  z-index: 9999;
  animation: globalWave 2s ease-out forwards;
}

@keyframes globalWave {
  0% { transform: translate(-50%, -50%) scale(0); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(4); opacity: 0; }
}

/* ============================================
   CONTACT
   ============================================ */
.section-contact {
  min-height: 80vh;
  background: rgba(7, 19, 31, 0.95);
}

.contact-text {
  color: var(--seafoam-silver);
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 480px;
}

.contact-form label {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--biolum-cyan);
}

.contact-form input,
.contact-form textarea {
  padding: 0.875rem 1rem;
  background: rgba(2, 7, 13, 0.8);
  border: 1px solid rgba(25, 227, 213, 0.2);
  border-radius: 6px;
  color: var(--text-light);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--biolum-cyan);
  box-shadow: 0 0 20px rgba(25, 227, 213, 0.15);
}

.contact-submit {
  align-self: flex-start;
  padding: 1rem 2.5rem;
  background: transparent;
  border: 1px solid var(--biolum-cyan);
  color: var(--biolum-cyan);
  font-family: var(--font-body);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.3s, color 0.3s;
  margin-top: 0.5rem;
}

.contact-submit:hover,
.contact-submit:focus-visible {
  background: var(--biolum-cyan);
  color: var(--deep-void);
  outline: none;
}

/* Footer */
.ocean-footer {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem;
  font-size: 0.85rem;
  color: var(--seafoam-silver);
  opacity: 0.5;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--transition-fluid), transform 0.8s var(--transition-fluid);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
  .ocean-nav__ring {
    width: min(95vw, 320px);
    height: min(95vw, 320px);
  }

  .ocean-nav__item {
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
  }

  .current-item {
    max-width: 100% !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
  }

  .light-metropolis {
    gap: 0.5rem;
  }

  .tidal-core {
    width: 150px;
    height: 150px;
  }
}

@media (max-width: 480px) {
  .shell-nav-trigger {
    top: 1rem;
    right: 1rem;
    width: 42px;
    height: 42px;
  }

  .descend-btn {
    padding: 1rem 2rem;
    font-size: 0.75rem;
  }
}