/* ============================================================
   mujun.studio -- Aquatic Cyberpunk / Deep-Sea Research Station
   Palette: Ethereal Blue
   Typography: Outfit + Nunito Sans + Azeret Mono (variable-fluid)
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Palette -- Ethereal Blue */
  --abyssal-ink: #0a1224;
  --pressure-hull: #0f1d35;
  --bioluminescent-current: #4a8ec2;
  --phosphor-teal: #5ec4b6;
  --jellyfish-glow: #7eb8f0;
  --frosted-depth: rgba(15, 29, 53, 0.55);
  --pelagic-white: #d4e3f5;
  --twilight-silver: #8a9bb5;
  --anglerfish-amber: #e8a84c;

  /* Variable-fluid type weights */
  --weight-display: clamp(200, calc(200 + (500 - 200) * ((100vw - 320px) / (1440 - 320))), 500);

  /* Glassmorphic shared values */
  --glass-bg: rgba(15, 29, 53, 0.55);
  --glass-blur: blur(20px);
  --glass-border: 1px solid rgba(74, 142, 194, 0.2);
  --glass-border-hover: 1px solid rgba(74, 142, 194, 0.4);
  --glass-radius: 16px;
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(126, 184, 240, 0.08);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--abyssal-ink);
  color: var(--pelagic-white);
  font-family: 'Nunito Sans', sans-serif;
  font-weight: 300;
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  line-height: 1.72;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

/* --- Porthole Container --- */
.porthole {
  max-width: 100%;
  border-radius: 24px;
  border: 2px solid rgba(74, 142, 194, 0.3);
  overflow: hidden;
  position: relative;
}

/* --- Typography --- */
.hero-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 200;
  font-size: clamp(2.8rem, 7vw, 5.6rem);
  color: var(--pelagic-white);
  text-shadow: 0 0 40px rgba(126, 184, 240, 0.15);
  letter-spacing: -0.02em;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeRiseIn 1200ms ease-out 1400ms forwards;
}

.hero-tagline {
  font-family: 'Nunito Sans', sans-serif;
  font-weight: 300;
  font-size: clamp(0.95rem, 2vw, 1.3rem);
  color: var(--twilight-silver);
  margin-top: 0.8rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeRiseIn 1200ms ease-out 2600ms forwards;
}

.zone-heading {
  font-family: 'Outfit', sans-serif;
  font-weight: 400;
  font-size: clamp(1.6rem, 4vw, 2.8rem);
  color: var(--pelagic-white);
  margin-bottom: 2rem;
  text-shadow: 0 0 30px rgba(126, 184, 240, 0.1);
}

.mono-accent {
  font-family: 'Azeret Mono', monospace;
  font-weight: 400;
  font-size: clamp(0.7rem, 1.2vw, 0.85rem);
  color: var(--phosphor-teal);
  letter-spacing: 0.04em;
}

/* --- Keyframe Animations --- */
@keyframes fadeRiseIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse-lure {
  0% {
    opacity: 0.3;
    filter: blur(2px);
  }
  50% {
    opacity: 1;
    filter: blur(6px) drop-shadow(0 0 12px #e8a84c);
  }
  100% {
    opacity: 0.3;
    filter: blur(2px);
  }
}

@keyframes float-y {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-18px);
  }
}

@keyframes chevron-bob {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(10px);
  }
}

@keyframes swim-right {
  0% {
    transform: translateX(-120px);
  }
  100% {
    transform: translateX(calc(100vw + 120px));
  }
}

@keyframes swim-left {
  0% {
    transform: translateX(calc(100vw + 120px));
  }
  100% {
    transform: translateX(-120px);
  }
}

@keyframes fish-wobble-y {
  0%, 100% {
    transform: translateY(0);
  }
  25% {
    transform: translateY(-8px);
  }
  75% {
    transform: translateY(8px);
  }
}

@keyframes card-enter {
  from {
    opacity: 0;
    transform: translateY(40px) scale(0.97);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

@keyframes plankton-float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

@keyframes plankton-pulse {
  0%, 100% {
    opacity: var(--p-opacity-min, 0.1);
  }
  50% {
    opacity: var(--p-opacity-max, 0.6);
  }
}

@keyframes margin-fish-drift {
  0%, 100% {
    transform: translateX(0) translateY(0);
  }
  30% {
    transform: translateX(8px) translateY(-5px);
  }
  70% {
    transform: translateX(-5px) translateY(5px);
  }
}

/* --- Fish Navigation (right-edge dots) --- */
.fish-nav {
  position: fixed;
  right: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  z-index: 100;
}

.fish-dot {
  position: relative;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bioluminescent-current);
  border: none;
  cursor: pointer;
  opacity: 0.4;
  transition: all 400ms ease;
  padding: 0;
}

.fish-dot:hover {
  opacity: 0.8;
  transform: scale(1.3);
}

.fish-dot.active {
  opacity: 1;
  width: 12px;
  height: 12px;
  animation: pulse-attention 2s ease-in-out infinite;
  background: var(--jellyfish-glow);
}

.fish-dot-label {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  font-family: 'Outfit', sans-serif;
  font-weight: 500;
  font-size: clamp(0.75rem, 1.5vw, 0.9rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pelagic-white);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 0.3rem 0.8rem;
  border-radius: 6px;
  border: 1px solid rgba(74, 142, 194, 0.2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease;
}

.fish-dot:hover .fish-dot-label {
  opacity: 1;
}

/* --- Zone Common --- */
.zone {
  min-height: 100vh;
  position: relative;
  overflow: hidden;
}

.zone-divider {
  width: 60%;
  max-width: 600px;
  height: 1px;
  margin: 0 auto;
  background: rgba(74, 142, 194, 0.15);
  opacity: 0;
  transition: opacity 800ms ease;
}

.zone-divider.visible {
  opacity: 1;
}

/* ============================================================
   Zone 1: Surface Entry
   ============================================================ */
.zone-surface {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: var(--abyssal-ink);
  position: relative;
}

.surface-content {
  text-align: center;
  z-index: 10;
  position: relative;
}

/* --- Bioluminescent Plankton Particle Field (CSS-only) --- */
.plankton-field {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.plankton {
  position: absolute;
  width: var(--p-size, 3px);
  height: var(--p-size, 3px);
  border-radius: 50%;
  background: radial-gradient(circle, var(--p-color, #7eb8f0) 0%, transparent 70%);
  opacity: 0;
  animation:
    plankton-float var(--p-float-dur, 10s) ease-in-out infinite var(--p-float-delay, 0s),
    plankton-pulse var(--p-pulse-dur, 5s) ease-in-out infinite var(--p-pulse-delay, 0s),
    fadeRiseIn 600ms ease-out var(--p-appear-delay, 600ms) forwards;
}

/* Plankton particles -- unique positions and timing via custom properties */
.p1  { --p-size: 3px; --p-color: #7eb8f0; left: 8%;  top: 15%; --p-float-dur: 9s;  --p-pulse-dur: 4s;  --p-float-delay: 0s;   --p-pulse-delay: 0.3s; --p-appear-delay: 700ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p2  { --p-size: 2px; --p-color: #5ec4b6; left: 15%; top: 40%; --p-float-dur: 12s; --p-pulse-dur: 6s;  --p-float-delay: 1.2s; --p-pulse-delay: 0.8s; --p-appear-delay: 800ms;  --p-opacity-min: 0.08; --p-opacity-max: 0.45; }
.p3  { --p-size: 4px; --p-color: #7eb8f0; left: 22%; top: 70%; --p-float-dur: 11s; --p-pulse-dur: 5s;  --p-float-delay: 0.5s; --p-pulse-delay: 1.5s; --p-appear-delay: 900ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.55; }
.p4  { --p-size: 2px; --p-color: #5ec4b6; left: 30%; top: 20%; --p-float-dur: 14s; --p-pulse-dur: 7s;  --p-float-delay: 2s;   --p-pulse-delay: 0.2s; --p-appear-delay: 750ms;  --p-opacity-min: 0.05; --p-opacity-max: 0.4; }
.p5  { --p-size: 3px; --p-color: #7eb8f0; left: 37%; top: 55%; --p-float-dur: 10s; --p-pulse-dur: 4.5s; --p-float-delay: 0.8s; --p-pulse-delay: 2s;   --p-appear-delay: 1000ms; --p-opacity-min: 0.1; --p-opacity-max: 0.6; }
.p6  { --p-size: 2px; --p-color: #7eb8f0; left: 45%; top: 10%; --p-float-dur: 13s; --p-pulse-dur: 5.5s; --p-float-delay: 1.5s; --p-pulse-delay: 1s;   --p-appear-delay: 850ms;  --p-opacity-min: 0.08; --p-opacity-max: 0.5; }
.p7  { --p-size: 3px; --p-color: #5ec4b6; left: 52%; top: 35%; --p-float-dur: 8s;  --p-pulse-dur: 6.5s; --p-float-delay: 0.3s; --p-pulse-delay: 0.5s; --p-appear-delay: 950ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.45; }
.p8  { --p-size: 4px; --p-color: #7eb8f0; left: 60%; top: 65%; --p-float-dur: 15s; --p-pulse-dur: 3.5s; --p-float-delay: 2.5s; --p-pulse-delay: 1.8s; --p-appear-delay: 1100ms; --p-opacity-min: 0.12; --p-opacity-max: 0.55; }
.p9  { --p-size: 2px; --p-color: #5ec4b6; left: 68%; top: 80%; --p-float-dur: 11s; --p-pulse-dur: 5s;  --p-float-delay: 1s;   --p-pulse-delay: 0.6s; --p-appear-delay: 1200ms; --p-opacity-min: 0.08; --p-opacity-max: 0.4; }
.p10 { --p-size: 3px; --p-color: #7eb8f0; left: 75%; top: 25%; --p-float-dur: 9s;  --p-pulse-dur: 4s;  --p-float-delay: 0.7s; --p-pulse-delay: 2.5s; --p-appear-delay: 680ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p11 { --p-size: 2px; --p-color: #7eb8f0; left: 82%; top: 50%; --p-float-dur: 12s; --p-pulse-dur: 6s;  --p-float-delay: 1.8s; --p-pulse-delay: 0.4s; --p-appear-delay: 1300ms; --p-opacity-min: 0.1; --p-opacity-max: 0.45; }
.p12 { --p-size: 3px; --p-color: #5ec4b6; left: 90%; top: 72%; --p-float-dur: 10s; --p-pulse-dur: 5.5s; --p-float-delay: 0.4s; --p-pulse-delay: 1.2s; --p-appear-delay: 1400ms; --p-opacity-min: 0.08; --p-opacity-max: 0.5; }
.p13 { --p-size: 4px; --p-color: #7eb8f0; left: 5%;  top: 88%; --p-float-dur: 13s; --p-pulse-dur: 4.5s; --p-float-delay: 2.2s; --p-pulse-delay: 0.9s; --p-appear-delay: 750ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.55; }
.p14 { --p-size: 2px; --p-color: #5ec4b6; left: 18%; top: 5%;  --p-float-dur: 11s; --p-pulse-dur: 7s;  --p-float-delay: 1.3s; --p-pulse-delay: 2.2s; --p-appear-delay: 900ms;  --p-opacity-min: 0.05; --p-opacity-max: 0.4; }
.p15 { --p-size: 3px; --p-color: #7eb8f0; left: 28%; top: 92%; --p-float-dur: 9s;  --p-pulse-dur: 5s;  --p-float-delay: 0.6s; --p-pulse-delay: 1.6s; --p-appear-delay: 1050ms; --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p16 { --p-size: 2px; --p-color: #7eb8f0; left: 42%; top: 78%; --p-float-dur: 14s; --p-pulse-dur: 6s;  --p-float-delay: 1.7s; --p-pulse-delay: 0.7s; --p-appear-delay: 1150ms; --p-opacity-min: 0.08; --p-opacity-max: 0.45; }
.p17 { --p-size: 3px; --p-color: #5ec4b6; left: 55%; top: 8%;  --p-float-dur: 10s; --p-pulse-dur: 4.5s; --p-float-delay: 0.9s; --p-pulse-delay: 1.3s; --p-appear-delay: 800ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p18 { --p-size: 4px; --p-color: #7eb8f0; left: 63%; top: 45%; --p-float-dur: 12s; --p-pulse-dur: 5.5s; --p-float-delay: 2.3s; --p-pulse-delay: 0.1s; --p-appear-delay: 1250ms; --p-opacity-min: 0.12; --p-opacity-max: 0.6; }
.p19 { --p-size: 2px; --p-color: #5ec4b6; left: 78%; top: 62%; --p-float-dur: 8s;  --p-pulse-dur: 3.5s; --p-float-delay: 1.1s; --p-pulse-delay: 2.1s; --p-appear-delay: 1350ms; --p-opacity-min: 0.08; --p-opacity-max: 0.45; }
.p20 { --p-size: 3px; --p-color: #7eb8f0; left: 88%; top: 30%; --p-float-dur: 11s; --p-pulse-dur: 6.5s; --p-float-delay: 0.2s; --p-pulse-delay: 1.7s; --p-appear-delay: 700ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p21 { --p-size: 2px; --p-color: #7eb8f0; left: 3%;  top: 52%; --p-float-dur: 13s; --p-pulse-dur: 5s;  --p-float-delay: 1.6s; --p-pulse-delay: 0.3s; --p-appear-delay: 1000ms; --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p22 { --p-size: 3px; --p-color: #5ec4b6; left: 12%; top: 28%; --p-float-dur: 9s;  --p-pulse-dur: 4s;  --p-float-delay: 0.8s; --p-pulse-delay: 2.4s; --p-appear-delay: 880ms;  --p-opacity-min: 0.08; --p-opacity-max: 0.45; }
.p23 { --p-size: 4px; --p-color: #7eb8f0; left: 25%; top: 48%; --p-float-dur: 15s; --p-pulse-dur: 7s;  --p-float-delay: 2.8s; --p-pulse-delay: 0.5s; --p-appear-delay: 1100ms; --p-opacity-min: 0.12; --p-opacity-max: 0.55; }
.p24 { --p-size: 2px; --p-color: #5ec4b6; left: 35%; top: 82%; --p-float-dur: 10s; --p-pulse-dur: 5.5s; --p-float-delay: 0.4s; --p-pulse-delay: 1.9s; --p-appear-delay: 1450ms; --p-opacity-min: 0.05; --p-opacity-max: 0.4; }
.p25 { --p-size: 3px; --p-color: #7eb8f0; left: 48%; top: 22%; --p-float-dur: 11s; --p-pulse-dur: 4.5s; --p-float-delay: 1.4s; --p-pulse-delay: 0.8s; --p-appear-delay: 950ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p26 { --p-size: 2px; --p-color: #7eb8f0; left: 58%; top: 90%; --p-float-dur: 12s; --p-pulse-dur: 6s;  --p-float-delay: 2.1s; --p-pulse-delay: 1.4s; --p-appear-delay: 1500ms; --p-opacity-min: 0.08; --p-opacity-max: 0.45; }
.p27 { --p-size: 3px; --p-color: #5ec4b6; left: 72%; top: 42%; --p-float-dur: 9s;  --p-pulse-dur: 5s;  --p-float-delay: 0.6s; --p-pulse-delay: 2.8s; --p-appear-delay: 780ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p28 { --p-size: 4px; --p-color: #7eb8f0; left: 85%; top: 15%; --p-float-dur: 14s; --p-pulse-dur: 3.5s; --p-float-delay: 1.9s; --p-pulse-delay: 0.2s; --p-appear-delay: 1200ms; --p-opacity-min: 0.12; --p-opacity-max: 0.6; }
.p29 { --p-size: 2px; --p-color: #5ec4b6; left: 93%; top: 55%; --p-float-dur: 10s; --p-pulse-dur: 6.5s; --p-float-delay: 0.3s; --p-pulse-delay: 1.1s; --p-appear-delay: 1350ms; --p-opacity-min: 0.08; --p-opacity-max: 0.45; }
.p30 { --p-size: 3px; --p-color: #7eb8f0; left: 7%;  top: 68%; --p-float-dur: 13s; --p-pulse-dur: 4s;  --p-float-delay: 2.6s; --p-pulse-delay: 0.6s; --p-appear-delay: 850ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p31 { --p-size: 2px; --p-color: #7eb8f0; left: 20%; top: 58%; --p-float-dur: 8s;  --p-pulse-dur: 5.5s; --p-float-delay: 1s;   --p-pulse-delay: 2.6s; --p-appear-delay: 1050ms; --p-opacity-min: 0.08; --p-opacity-max: 0.5; }
.p32 { --p-size: 3px; --p-color: #5ec4b6; left: 33%; top: 12%; --p-float-dur: 11s; --p-pulse-dur: 4.5s; --p-float-delay: 0.7s; --p-pulse-delay: 0.4s; --p-appear-delay: 720ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.45; }
.p33 { --p-size: 2px; --p-color: #7eb8f0; left: 50%; top: 95%; --p-float-dur: 12s; --p-pulse-dur: 7s;  --p-float-delay: 2.4s; --p-pulse-delay: 1.5s; --p-appear-delay: 1550ms; --p-opacity-min: 0.05; --p-opacity-max: 0.4; }
.p34 { --p-size: 4px; --p-color: #5ec4b6; left: 65%; top: 3%;  --p-float-dur: 9s;  --p-pulse-dur: 5s;  --p-float-delay: 0.5s; --p-pulse-delay: 2.3s; --p-appear-delay: 680ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.55; }
.p35 { --p-size: 3px; --p-color: #7eb8f0; left: 80%; top: 38%; --p-float-dur: 10s; --p-pulse-dur: 6s;  --p-float-delay: 1.8s; --p-pulse-delay: 0.9s; --p-appear-delay: 1150ms; --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p36 { --p-size: 2px; --p-color: #7eb8f0; left: 95%; top: 85%; --p-float-dur: 14s; --p-pulse-dur: 4.5s; --p-float-delay: 0.9s; --p-pulse-delay: 1.8s; --p-appear-delay: 1400ms; --p-opacity-min: 0.08; --p-opacity-max: 0.45; }
.p37 { --p-size: 3px; --p-color: #5ec4b6; left: 40%; top: 32%; --p-float-dur: 11s; --p-pulse-dur: 5.5s; --p-float-delay: 2.7s; --p-pulse-delay: 0.1s; --p-appear-delay: 920ms;  --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p38 { --p-size: 2px; --p-color: #7eb8f0; left: 16%; top: 75%; --p-float-dur: 9s;  --p-pulse-dur: 3.5s; --p-float-delay: 1.3s; --p-pulse-delay: 2.7s; --p-appear-delay: 1250ms; --p-opacity-min: 0.1; --p-opacity-max: 0.5; }
.p39 { --p-size: 3px; --p-color: #5ec4b6; left: 70%; top: 18%; --p-float-dur: 13s; --p-pulse-dur: 6.5s; --p-float-delay: 0.2s; --p-pulse-delay: 0.7s; --p-appear-delay: 770ms;  --p-opacity-min: 0.08; --p-opacity-max: 0.45; }
.p40 { --p-size: 4px; --p-color: #7eb8f0; left: 47%; top: 60%; --p-float-dur: 10s; --p-pulse-dur: 5s;  --p-float-delay: 2s;   --p-pulse-delay: 1.6s; --p-appear-delay: 1300ms; --p-opacity-min: 0.12; --p-opacity-max: 0.6; }

/* --- Zone 1: Swimming Fish --- */
.fish-container {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
}

.swimming-fish {
  position: absolute;
}

.fish-wobble {
  animation: fish-wobble-y 4s ease-in-out infinite;
}

.f1 {
  width: 30px;
  top: 25%;
  animation: swim-right 30s linear infinite;
}
.f1 .fish-wobble { animation-duration: 3.5s; }

.f2 {
  width: 40px;
  top: 55%;
  animation: swim-left 38s linear infinite;
  animation-delay: -10s;
}
.f2 .fish-wobble { animation-duration: 4.5s; animation-delay: -1s; }

.f3 {
  width: 25px;
  top: 75%;
  animation: swim-right 42s linear infinite;
  animation-delay: -5s;
}
.f3 .fish-wobble { animation-duration: 5s; animation-delay: -2s; }

.f4 {
  width: 28px;
  top: 38%;
  animation: swim-left 35s linear infinite;
  animation-delay: -18s;
}
.f4 .fish-wobble { animation-duration: 3.8s; animation-delay: -0.5s; }

/* --- Scroll Chevron --- */
.scroll-chevron {
  position: absolute;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  opacity: 0;
  animation:
    fadeRiseIn 600ms ease-out 3800ms forwards,
    chevron-bob 3s ease-in-out infinite 3800ms;
}

/* ============================================================
   Zone 2: Observation Deck
   ============================================================ */
.zone-observation {
  background: linear-gradient(180deg, var(--abyssal-ink) 0%, #0b1428 50%, var(--abyssal-ink) 100%);
  padding: 6rem 2rem;
}

.zone-observation .zone-heading {
  text-align: center;
  margin-bottom: 3.5rem;
}

/* --- Staggered Card Grid --- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  max-width: 960px;
  margin: 0 auto;
}

.glass-card {
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border: var(--glass-border);
  border-radius: var(--glass-radius);
  box-shadow: var(--glass-shadow);
  padding: 2rem 1.8rem;
  overflow: hidden;
  transition: border 400ms ease, backdrop-filter 400ms ease;
}

.glass-card:hover {
  border: var(--glass-border-hover);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
}

.glass-card:hover .pulse-dot {
  opacity: 1;
}

.glass-card h3 {
  font-family: 'Outfit', sans-serif;
  font-weight: 500;
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--jellyfish-glow);
  margin-bottom: 0.8rem;
  position: relative;
  z-index: 2;
}

.glass-card p {
  position: relative;
  z-index: 2;
  color: var(--pelagic-white);
  opacity: 0.9;
}

.card-right {
  margin-top: 120px;
}

/* Card entrance animation (triggered by JS) */
.card-reveal {
  opacity: 0;
  transform: translateY(40px) scale(0.97);
  filter: blur(4px);
  transition: none;
}

.card-reveal.visible {
  animation: card-enter 600ms ease-out forwards;
}

.card-reveal.visible.delay-150 {
  animation-delay: 150ms;
}

/* Card background swimming fish */
.card-fish {
  position: absolute;
  width: 80px;
  bottom: 10px;
  right: -10px;
  z-index: 1;
  animation: swim-right 25s linear infinite;
  opacity: 0.6;
}

/* Pulse dot on card hover */
.pulse-dot {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--jellyfish-glow);
  opacity: 0;
  transition: opacity 300ms ease;
  animation: pulse-attention 2s ease-in-out infinite;
  z-index: 5;
}

/* ============================================================
   Zone 3: Laboratory
   ============================================================ */
.zone-laboratory {
  background: linear-gradient(180deg, var(--abyssal-ink) 0%, #091020 100%);
  padding: 6rem 2rem;
  position: relative;
  overflow: hidden;
}

.lab-content {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
  z-index: 5;
}

.lab-content p {
  margin-bottom: 1.6rem;
}

.lab-aside {
  margin-top: 2rem;
  margin-bottom: 2rem;
  padding: 1rem 1.4rem;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(74, 142, 194, 0.15);
  border-radius: 10px;
  font-style: italic;
  color: var(--twilight-silver);
}

/* Glassmorphic inline highlighting */
.glass-highlight {
  background: rgba(15, 29, 53, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 0.1em 0.5em;
  border-radius: 4px;
  border: 1px solid rgba(74, 142, 194, 0.15);
  color: var(--jellyfish-glow);
  white-space: nowrap;
}

/* Margin fish decorations */
.margin-fish {
  position: absolute;
  z-index: 2;
  opacity: 0.6;
  animation: margin-fish-drift 12s ease-in-out infinite;
}

.margin-fish-left {
  width: 90px;
  left: -20px;
  top: 20%;
  animation-delay: 0s;
}

.margin-fish-right {
  width: 70px;
  right: -10px;
  top: 45%;
  animation-delay: -4s;
}

.margin-fish-left-2 {
  width: 80px;
  left: -15px;
  top: 72%;
  animation-delay: -8s;
}

/* ============================================================
   Zone 4: Deep Trench
   ============================================================ */
.zone-trench {
  background: linear-gradient(180deg, #091020 0%, #060d1a 50%, #040a14 100%);
  padding: 8rem 2rem;
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.anglerfish {
  position: absolute;
  width: clamp(300px, 50vw, 600px);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.08;
  z-index: 1;
  pointer-events: none;
}

.anglerfish-lure {
  animation: pulse-lure 4s ease-in-out infinite;
}

.trench-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 600px;
}

.trench-heading {
  font-weight: 300;
  margin-bottom: 2.5rem;
}

.trench-text {
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  line-height: 1.8;
  color: var(--pelagic-white);
  margin-bottom: 1.5rem;
}

.trench-contact {
  margin-top: 4rem;
  margin-bottom: 3rem;
}

.trench-contact .mono-accent {
  display: block;
  margin-bottom: 0.8rem;
}

.trench-link {
  font-family: 'Outfit', sans-serif;
  font-weight: 400;
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--bioluminescent-current);
  text-decoration: none;
  position: relative;
  background-image: linear-gradient(var(--phosphor-teal), var(--phosphor-teal));
  background-size: 0% 1px;
  background-position: 0% 100%;
  background-repeat: no-repeat;
  transition: color 300ms ease, background-size 300ms ease;
}

.trench-link:hover {
  color: var(--phosphor-teal);
  background-size: 100% 1px;
}

.trench-sign-off {
  font-family: 'Outfit', sans-serif;
  font-weight: 300;
  font-size: clamp(0.85rem, 1.5vw, 1rem);
  color: var(--twilight-silver);
  margin-top: 4rem;
  letter-spacing: 0.05em;
}

.twilight {
  color: rgba(138, 155, 181, 0.5);
}

/* ============================================================
   Interactive States (links)
   ============================================================ */
a {
  color: var(--bioluminescent-current);
  text-decoration: none;
  position: relative;
  transition: color 300ms ease;
}

a:hover {
  color: var(--phosphor-teal);
}

/* ============================================================
   Responsive Adjustments
   ============================================================ */
@media (max-width: 768px) {
  .card-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .card-right {
    margin-top: 0;
  }

  .fish-nav {
    right: 0.6rem;
    gap: 0.8rem;
  }

  .fish-dot-label {
    display: none;
  }

  .margin-fish {
    display: none;
  }

  .zone-observation,
  .zone-laboratory {
    padding: 4rem 1.2rem;
  }

  .zone-trench {
    padding: 5rem 1.2rem;
  }

  .porthole {
    border-radius: 0;
    border: none;
  }
}

@media (max-width: 480px) {
  .hero-title {
    letter-spacing: -0.01em;
  }

  .glass-card {
    padding: 1.4rem 1.2rem;
  }

  .trench-content {
    padding: 0 0.5rem;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .plankton {
    opacity: 0.3;
  }

  .hero-title,
  .hero-tagline {
    opacity: 1;
    transform: none;
  }

  .card-reveal {
    opacity: 1;
    transform: none;
    filter: none;
  }

  .scroll-chevron {
    opacity: 1;
  }
}