/* ============================================================
   Stereogram Analyzer — optical-depth-lab theme
   ============================================================ */
:root {
  --bg: #070912;
  --bg-2: #0b0f1f;
  --panel: #0e1322;
  --panel-2: #121a30;
  --line: #1d2742;
  --line-soft: #161e34;
  --ink: #e8eef7;
  --ink-dim: #8b9ac0;
  --ink-faint: #56648a;
  --teal: #2aa3b0;
  --cyan: #3fd2c7;
  --violet: #7c5cff;
  --magenta: #ff6ad5;
  --amber: #ffd37a;
  --grad: linear-gradient(100deg, var(--cyan), var(--violet) 55%, var(--magenta));
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.8);
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: "Spline Sans Mono", ui-monospace, monospace;
  color: var(--ink);
  background:
    radial-gradient(1200px 700px at 78% -10%, rgba(124, 92, 255, 0.16), transparent 60%),
    radial-gradient(900px 600px at 0% 110%, rgba(42, 163, 176, 0.14), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* subtle grain + scanline atmosphere */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: 0.5;
  background-image:
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.015) 0px,
      rgba(255, 255, 255, 0.015) 1px,
      transparent 1px,
      transparent 3px
    );
  mix-blend-mode: screen;
}

a { color: var(--cyan); }

/* ───────────────── masthead ───────────────── */
.masthead {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 40px clamp(20px, 5vw, 64px) 20px;
}
.eyebrow {
  font-size: 11px;
  letter-spacing: 0.42em;
  color: var(--teal);
  margin-bottom: 14px;
}
h1 {
  font-family: "Syne", sans-serif;
  font-weight: 800;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 0.92;
  margin: 0;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
h1 span {
  display: block;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tagline {
  max-width: 48ch;
  color: var(--ink-dim);
  margin: 18px 0 0;
  font-size: 14px;
}
.tagline em { color: var(--ink); font-style: italic; }
.repo-link {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  padding: 9px 14px;
  border-radius: 999px;
  transition: 0.2s;
}
.repo-link:hover { color: var(--ink); border-color: var(--violet); }

/* ───────────────── workbench grid ───────────────── */
.workbench {
  flex: 1;
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 18px;
  padding: 10px clamp(20px, 5vw, 64px) 28px;
  align-items: stretch;
}
.panel {
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ───────────────── controls ───────────────── */
.controls {
  padding: 8px 18px 18px;
  overflow-y: auto;
  max-height: calc(100vh - 150px);
  position: sticky;
  top: 16px;
}
.block { padding: 18px 0; border-bottom: 1px solid var(--line-soft); }
.block:last-child { border-bottom: none; }
.block-title {
  font-family: "Syne", sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 14px;
}

.dropzone {
  border: 1.5px dashed var(--line);
  border-radius: 12px;
  background: rgba(63, 210, 199, 0.03);
  cursor: pointer;
  transition: 0.2s;
  padding: 22px 14px;
  text-align: center;
}
.dropzone:hover,
.dropzone.drag {
  border-color: var(--cyan);
  background: rgba(63, 210, 199, 0.08);
}
.dz-icon { font-size: 28px; color: var(--cyan); }
.dz-inner p { margin: 8px 0 4px; font-size: 13px; color: var(--ink); }
.dz-inner small { color: var(--ink-faint); letter-spacing: 0.15em; font-size: 10px; }

.field {
  display: block;
  margin: 14px 0;
  font-size: 12px;
  color: var(--ink-dim);
}
.field > span {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 7px;
}
.field i {
  font-style: normal;
  color: var(--cyan);
  font-weight: 600;
  font-size: 11px;
}
.field select {
  width: 100%;
  background: var(--panel-2);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
  font-family: inherit;
  font-size: 13px;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 4px;
  background: var(--line);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cyan);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--cyan);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan);
  border: 3px solid var(--bg);
  cursor: pointer;
}

/* ───────────────── buttons ───────────────── */
.btn {
  font-family: "Syne", sans-serif;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 12px;
  text-transform: uppercase;
  border-radius: 9px;
  padding: 11px 14px;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  transition: 0.18s;
}
.btn:hover:not(:disabled) { border-color: var(--violet); transform: translateY(-1px); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.full { width: 100%; }
.btn.ghost { background: transparent; color: var(--ink-dim); }
.btn.ghost:hover:not(:disabled) { color: var(--ink); }
.btn.primary {
  background: var(--grad);
  color: #05070f;
  border: none;
  font-size: 14px;
  padding: 14px;
  box-shadow: 0 10px 30px -10px rgba(124, 92, 255, 0.7);
}
.btn.primary:hover:not(:disabled) { transform: translateY(-2px); }
#sample { margin-top: 12px; }

.export-grid { display: grid; gap: 8px; }

/* progress + readout */
.progress { margin-top: 14px; }
.progress .bar {
  height: 5px;
  border-radius: 4px;
  background: var(--line);
  overflow: hidden;
}
.progress .bar i {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--grad);
  transition: width 0.15s;
}
.progress span {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}
.readout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 16px 0 0;
}
.readout div {
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
  border-radius: 9px;
  padding: 10px 12px;
}
.readout dt {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.readout dd {
  margin: 4px 0 0;
  font-family: "Syne", sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--cyan);
}

/* ───────────────── stage / viewport ───────────────── */
.stage { display: flex; flex-direction: column; min-height: 560px; overflow: hidden; }
.tabs {
  display: flex;
  gap: 2px;
  padding: 10px 10px 0;
  border-bottom: 1px solid var(--line);
}
.tab {
  font-family: "Syne", sans-serif;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 16px;
  cursor: pointer;
  transition: 0.18s;
}
.tab:hover { color: var(--ink-dim); }
.tab.active {
  color: var(--ink);
  border-bottom-color: var(--cyan);
}

.views { position: relative; flex: 1; }
.view {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.view.active { display: flex; }
.view canvas {
  max-width: 100%;
  max-height: 100%;
  border-radius: 8px;
  image-rendering: auto;
  box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.7);
  background:
    linear-gradient(45deg, #0c1120 25%, transparent 25%) 0 0 / 20px 20px,
    linear-gradient(-45deg, #0c1120 25%, transparent 25%) 0 0 / 20px 20px,
    var(--bg-2);
}
#canvasTexture { image-rendering: pixelated; }

.placeholder {
  position: absolute;
  text-align: center;
  color: var(--ink-dim);
  font-size: 14px;
  max-width: 46ch;
  line-height: 1.7;
}
.placeholder .hint {
  display: block;
  margin-top: 16px;
  font-size: 12px;
  color: var(--ink-faint);
}

#surface { width: 100%; height: 100%; }
.surface-hint {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  pointer-events: none;
}

/* ───────────────── colophon ───────────────── */
.colophon {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 16px clamp(20px, 5vw, 64px) 34px;
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

/* ───────────────── responsive ───────────────── */
@media (max-width: 900px) {
  .workbench { grid-template-columns: 1fr; }
  .controls { position: static; max-height: none; }
  .stage { min-height: 70vh; }
}

/* fade-in on load */
.masthead, .panel { animation: rise 0.7s cubic-bezier(0.2, 0.8, 0.2, 1) both; }
.panel.controls { animation-delay: 0.08s; }
.panel.stage { animation-delay: 0.16s; }
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}