:root{
  --ink:#041018;
  --deep:#02070c;
  --teal:#0aa6a6;
  --aqua:#75ffe6;
  --foam:#d7fff7;

  --glass: rgba(7, 28, 40, 0.58);
  --glass2: rgba(10, 38, 54, 0.38);
  --stroke: rgba(255,255,255,0.14);

  --text: #e9fbff;
  --muted: rgba(233,251,255,0.72);
  --muter: rgba(233,251,255,0.52);

  --radius: 22px;
  --shadow: 0 22px 80px rgba(0,0,0,0.55);

  /* controlled by JS (app.js updates this) */
  --blur: 26px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }

body{
  margin:0;
  color:var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background:
    radial-gradient(1200px 800px at 30% 10%, rgba(117,255,230,0.18), transparent 60%),
    radial-gradient(900px 600px at 70% 0%, rgba(10,166,166,0.22), transparent 55%),
    linear-gradient(180deg, var(--ink), var(--deep) 55%, #000 110%);
  overflow-x:hidden;
}

/* ---- Deep sea scene layers ---- */
body::before{
  /* caustics shimmer */
  content:"";
  position:fixed;
  inset:-30%;
  background:
    radial-gradient(closest-side at 20% 30%, rgba(117,255,230,0.12), transparent 60%),
    radial-gradient(closest-side at 70% 40%, rgba(10,166,166,0.10), transparent 65%),
    repeating-radial-gradient(circle at 30% 20%,
      rgba(255,255,255,0.03) 0px,
      rgba(255,255,255,0.02) 18px,
      rgba(255,255,255,0.00) 42px);
  filter: blur(10px) saturate(1.2);
  opacity:0.7;
  mix-blend-mode: screen;
  animation: caustics 12s ease-in-out infinite alternate;
  pointer-events:none;
  z-index: 0;
}

body::after{
  /* marine snow */
  content:"";
  position:fixed;
  inset:0;
  background-image:
    radial-gradient(circle at 10% 10%, rgba(255,255,255,0.18) 0 1px, transparent 2px),
    radial-gradient(circle at 40% 30%, rgba(255,255,255,0.12) 0 1px, transparent 2px),
    radial-gradient(circle at 70% 60%, rgba(255,255,255,0.14) 0 1px, transparent 2px),
    radial-gradient(circle at 90% 20%, rgba(255,255,255,0.10) 0 1px, transparent 2px),
    radial-gradient(circle at 25% 80%, rgba(255,255,255,0.10) 0 1px, transparent 2px);
  background-size: 220px 220px, 280px 280px, 340px 340px, 260px 260px, 300px 300px;
  opacity:0.55;
  animation: snow 18s linear infinite;
  pointer-events:none;
  z-index: 0;
}

/* Kelp silhouettes */
.scene-kelp{
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 38vh;
  pointer-events: none;
  z-index: 5;
  opacity: 0.9;
  background:
    radial-gradient(160px 520px at 8% 120%, rgba(0,120,90,0.85), transparent 72%),
    radial-gradient(140px 460px at 14% 120%, rgba(0,95,75,0.70), transparent 72%),
    radial-gradient(180px 600px at 20% 120%, rgba(0,80,70,0.65), transparent 74%),
    radial-gradient(200px 640px at 92% 120%, rgba(0,120,90,0.85), transparent 74%),
    radial-gradient(160px 520px at 86% 120%, rgba(0,95,75,0.70), transparent 72%),
    radial-gradient(180px 600px at 80% 120%, rgba(0,80,70,0.65), transparent 74%);
  filter: blur(0.5px);
  mix-blend-mode: screen;
}

/* ---- Layout ---- */
.wrap{
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px;
  position:relative;
  z-index: 10; /* above kelp */
}

/* Header */
.top{
  display:flex;
  justify-content:space-between;
  gap:14px;
  align-items:flex-end;
  padding: 10px 6px 18px;
}

h1{
  margin:0;
  font-size: clamp(24px, 3.8vw, 40px);
  letter-spacing: -0.03em;
  text-shadow: 0 10px 30px rgba(0,0,0,0.35);
}

.sub{
  margin:6px 0 0;
  color:var(--muted);
  max-width: 64ch;
  line-height:1.35;
}

.pillrow{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:flex-end;
  gap:10px;
}

.pill{
  font-size: 12px;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.03));
  backdrop-filter: blur(10px);
}

/* Buttons */
button{
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, rgba(255,255,255,0.10), rgba(255,255,255,0.04));
  color: var(--text);
  padding: 11px 12px;
  border-radius: 14px;
  cursor:pointer;
  transition: transform 120ms ease, filter 120ms ease, background 120ms ease;
  backdrop-filter: blur(10px);
}

button:hover{ filter: brightness(1.08); }
button:active{ transform: translateY(1px); }
button:focus{
  outline:none;
  box-shadow: 0 0 0 3px rgba(117,255,230,0.18);
}

button.ghost{ background: transparent; }

/* ---- Main viewport ---- */
.card{
  display:grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 16px;
  border-radius: var(--radius);
  overflow:hidden;
  background: linear-gradient(180deg, var(--glass), var(--glass2));
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: var(--shadow);
  position:relative;

  /* critical: prevent overlay/filters from “leaking” across columns */
  isolation: isolate;
}

/* subtle inner rim */
.card::before{
  content:"";
  position:absolute;
  inset:10px;
  border-radius: calc(var(--radius) - 10px);
  border: 1px solid rgba(255,255,255,0.10);
  pointer-events:none;
  z-index: 3;
}

/* Image column */
.imgFrame{
  position:relative;
  overflow:hidden; /* critical: clip image + overlays */
  min-height: 420px;
  background:
    radial-gradient(800px 400px at 40% 0%, rgba(117,255,230,0.16), transparent 60%),
    linear-gradient(180deg, rgba(0,0,0,0.25), rgba(0,0,0,0.60));
}

/* Blurred image (no scale to avoid edge bleed artifacts) */
.imgFrame img{
  width:100%;
  height:100%;
  object-fit: cover;
  display:block;
  position: relative;
  z-index: 0;
  transform: none;
  filter: blur(var(--blur)) saturate(1.1) contrast(1.05);
  transition: filter 240ms ease;
}

/* Vignette + glass reflections */
.imgFrame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index: 1;
  background:
    radial-gradient(closest-side at 50% 40%, transparent 55%, rgba(0,0,0,0.55) 100%),
    linear-gradient(120deg, rgba(255,255,255,0.08), transparent 40%),
    linear-gradient(240deg, rgba(117,255,230,0.06), transparent 45%);
  mix-blend-mode: overlay;
  pointer-events:none;
}

.imgOverlay{
  position:absolute;
  inset:0;
  z-index: 2;
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  padding: 12px 14px;
  background: linear-gradient(180deg, transparent 55%, rgba(0,0,0,0.70));
  pointer-events:none;
}

.overlayText{
  font-size: 12px;
  color: rgba(255,255,255,0.90);
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(0,0,0,0.30);
  padding: 7px 10px;
  border-radius: 999px;
  backdrop-filter: blur(8px);
}

/* Right column */
.content{
  padding: 16px 16px 12px;
  display:flex;
  flex-direction:column;
  gap: 12px;
  position: relative;
  z-index: 4; /* above image column visuals */
}

/* Optional seam between columns */
.content{
  border-left: 1px solid rgba(255,255,255,0.10);
}

.promptRow{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:10px;
}

.prompt{
  margin:0;
  font-weight:650;
  letter-spacing:-0.015em;
  font-size: 16px;
}

.tagline{
  font-size:12px;
  color:var(--muter);
  text-align:right;
  text-transform: lowercase;
}

.guessRow{
  display:flex;
  gap:10px;
}

input{
  flex:1;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(0,0,0,0.20);
  color: var(--text);
  outline: none;
}

input::placeholder{ color: rgba(233,251,255,0.52); }

input:focus{
  border-color: rgba(117,255,230,0.40);
  box-shadow: 0 0 0 3px rgba(117,255,230,0.18);
}

.actions{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}

.hintBox{
  border-top: 1px solid rgba(255,255,255,0.10);
  padding-top: 10px;
  min-height: 96px;
}

#hintList{
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.48;
}

#hintList li{ margin: 6px 0; }

.revealBox{
  display:none;
  border-top: 1px solid rgba(255,255,255,0.10);
  padding-top: 12px;
}

.revealBox.show{ display:block; }

.revealBox h2{
  margin: 0 0 6px;
  font-size: 20px;
  letter-spacing:-0.015em;
}

.revealFact{
  margin: 0 0 8px;
  color: var(--muted);
}

.revealWhy{
  margin: 0;
  color: var(--text);
}

.revealActions{
  display:flex;
  gap:10px;
  margin-top: 12px;
  flex-wrap:wrap;
}

.footer .fine{
  margin: 0;
  font-size: 12px;
  color: var(--muter);
}

/* Mobile */
@media (max-width: 900px){
  .card{ grid-template-columns: 1fr; }
  .imgFrame{ min-height: 320px; }
  .content{
    border-left: none;
    border-top: 1px solid rgba(255,255,255,0.10);
  }
}

/* Animations */
@keyframes caustics{
  0%{ transform: translate3d(-2%, -1%, 0) scale(1.02); opacity:0.55; }
  100%{ transform: translate3d(2%, 1%, 0) scale(1.06); opacity:0.78; }
}

@keyframes snow{
  0%{ transform: translateY(-10%); }
  100%{ transform: translateY(10%); }
}
.letterHint{
  margin-top: 4px;
}

.pattern{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  letter-spacing: 0.28em;
  font-size: 14px;
  color: var(--muted);
  user-select: none;
}