:root {
  /* dark studio (viewer + page) */
  --bg: #161616;
  --viewer-0: #232326;
  --viewer-1: #161616;
  --viewer-2: #121212;
  --strip: #101011;
  --d-text: #F5F4F0;
  --d-muted: #A2A19F;
  --d-faint: #6A6A6A;
  --d-line: rgba(245, 244, 240, 0.10);

  /* light inspector (LINESIGHT cream) */
  --panel: #F5F4F0;
  --panel-foot: #EFEDE7;
  --ink: #2A2A2A;
  --ink-soft: #6A6A6A;
  --muted: #A2A19F;
  --surface: #FFFFFF;
  --line: rgba(42, 42, 42, 0.14);
  --line-2: rgba(42, 42, 42, 0.10);
  --line-input: #D9D6D1;

  /* brand */
  --accent: #FF5D2A;
  --accent-deep: #E0481A;
  --accent-soft: rgba(255, 93, 42, 0.18);
  --ok: #5a8f48;
  --warn: #b9791f;
  --danger: #c0392b;

  /* type */
  --f-display: "Funnel Display", system-ui, sans-serif;
  --f-sans: "Funnel Sans", system-ui, sans-serif;
  --f-mono: "Space Mono", ui-monospace, monospace;

  /* spacing */
  --pad-x: 1.875rem;
}

* { box-sizing: border-box; }

html { font-size: clamp(0.875rem, 0.55vw + 0.66rem, 1.0625rem); }

html, body {
  margin: 0; height: 100%;
  font-family: var(--f-sans);
  background: var(--bg); color: var(--d-text);
  -webkit-font-smoothing: antialiased;
}

#app { display: flex; height: 100vh; overflow: hidden; }

/* ---------------- editorial index strip ---------------- */
#rail {
  width: 5rem; flex: 0 0 auto;
  background: var(--strip); border-right: 1px solid var(--d-line);
  display: flex; flex-direction: column; align-items: center; justify-content: space-between;
  padding: 1.625rem 0;
}
.rail-mark {
  width: 1.625rem; height: 1.625rem; display: grid; place-items: center;
  background: var(--accent); color: #161616;
  font-family: var(--f-mono); font-weight: 700; font-size: 0.75rem;
}
.rail-spine {
  writing-mode: vertical-rl; transform: rotate(180deg);
  font-family: var(--f-mono); font-size: 0.69rem; letter-spacing: 0.42em; color: var(--d-faint);
}
/* viewer light-brightness slider (replaces the 01/02/03 index) */
.rail-light { display: flex; flex-direction: column; align-items: center; gap: 0.7rem; }
.rl-val {
  font-family: var(--f-mono); font-size: 0.69rem; color: var(--d-muted);
  font-variant-numeric: tabular-nums;
}
.rl-cap { font-family: var(--f-mono); font-size: 0.56rem; letter-spacing: 0.18em; color: var(--d-faint); }
.rail-slider {
  -webkit-appearance: none; appearance: none;
  writing-mode: vertical-lr; direction: rtl;   /* up = brighter */
  width: 0.5rem; height: 7.5rem; background: transparent; cursor: ns-resize; margin: 0;
}
.rail-slider::-webkit-slider-runnable-track { width: 0.5rem; background: #2e2e30; border-radius: 0.25rem; }
.rail-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 0.5rem; height: 0.5rem; background: var(--accent); border: none; border-radius: 1px;
}
.rail-slider::-moz-range-track { width: 0.5rem; background: #2e2e30; border-radius: 0.25rem; }
.rail-slider::-moz-range-thumb { width: 0.5rem; height: 0.5rem; background: var(--accent); border: none; border-radius: 1px; }
.rail-slider:focus-visible { outline: 1px solid var(--accent); outline-offset: 3px; }

/* ---------------- viewport ---------------- */
#viewport {
  flex: 1 1 auto; min-width: 0; position: relative;
  background: radial-gradient(120% 90% at 50% 30%, var(--viewer-0) 0%, var(--viewer-1) 62%, var(--viewer-2) 100%);
}
#viewport canvas { display: block; }

/* registration crop marks */
.cm { position: absolute; width: 0.94rem; height: 0.94rem; z-index: 3; pointer-events: none; }
.cm-tl { left: 1.25rem; top: 1.25rem; border-left: 1.5px solid var(--accent); border-top: 1.5px solid var(--accent); }
.cm-tr { right: 1.25rem; top: 1.25rem; border-right: 1.5px solid var(--accent); border-top: 1.5px solid var(--accent); }
.cm-bl { left: 1.25rem; bottom: 1.25rem; border-left: 1.5px solid var(--accent); border-bottom: 1.5px solid var(--accent); }
.cm-br { right: 1.25rem; bottom: 1.25rem; border-right: 1.5px solid var(--accent); border-bottom: 1.5px solid var(--accent); }

.vp-tag {
  position: absolute; right: 2.125rem; bottom: 1.9rem; z-index: 3; pointer-events: none;
  font-family: var(--f-mono); font-size: 0.63rem; letter-spacing: 0.16em; color: var(--d-faint);
}

#viewer_tools {
  position: absolute; left: 2.125rem; bottom: 1.75rem; z-index: 3;
  display: flex; flex-direction: column; align-items: flex-start; gap: 0.55rem;
  font-family: var(--f-mono); font-size: 0.69rem; letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--d-muted);
}
#viewer_tools[hidden] { display: none; }
.vt-toggle { display: flex; align-items: center; gap: 0.5rem; cursor: pointer; }
.vt-toggle input { accent-color: var(--accent); width: 0.88rem; height: 0.88rem; }

/* drag-and-drop dropzone cue */
#viewport.dragover { outline: 2px dashed var(--accent); outline-offset: -0.75rem; }

/* generating overlay */
#gen_overlay {
  position: absolute; inset: 0; z-index: 5;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 1.1rem;
  background: radial-gradient(120% 120% at 50% 45%, rgba(15, 15, 16, 0.35), rgba(15, 15, 16, 0.74));
  backdrop-filter: blur(3px);
}
#gen_overlay[hidden] { display: none; }
.craft-rings { position: relative; width: 84px; height: 84px; }
.craft-rings span, .craft-rings i {
  position: absolute; left: 50%; top: 50%; border-radius: 50%;
  transform: translate(-50%, -50%);
}
.craft-rings span {
  width: 100%; height: 100%;
  border: 1.5px solid var(--accent);
  opacity: 0; animation: craftpulse 1.8s cubic-bezier(.2, .6, .2, 1) infinite;
}
.craft-rings span:nth-child(2) { animation-delay: .6s; }
.craft-rings span:nth-child(3) { animation-delay: 1.2s; }
.craft-rings i {
  width: 9px; height: 9px; background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
@keyframes craftpulse {
  0%   { transform: translate(-50%, -50%) scale(.16); opacity: .9; }
  70%  { opacity: .22; }
  100% { transform: translate(-50%, -50%) scale(1); opacity: 0; }
}
.craft-label {
  font-family: var(--f-mono); font-weight: 700;
  text-transform: uppercase; letter-spacing: .28em;
  font-size: .7rem; color: var(--accent); padding-left: .28em;
}
@media (prefers-reduced-motion: reduce) {
  .craft-rings span { animation-duration: 3.2s; }
}

#hint {
  position: absolute; left: 50%; top: 38%; transform: translate(-50%, -50%);
  z-index: 2; text-align: center; pointer-events: none;
  color: var(--d-muted); font-size: 0.88rem; line-height: 1.55; letter-spacing: .2px;
  max-width: 22rem;
}
#hint::before {
  content: "MINIBASED";
  display: block;
  font-family: var(--f-mono);
  font-weight: 700; font-size: 0.69rem; letter-spacing: 0.28em;
  color: var(--accent); margin-bottom: 0.9rem;
}

/* ---------------- panel (light inspector) ---------------- */
#panel {
  width: clamp(20rem, 27vw, 27.5rem);
  flex: 0 0 auto; min-height: 0;
  background: var(--panel); color: var(--ink);
  border-left: 1px solid var(--line);
  display: flex; flex-direction: column; overflow: hidden;
}

.panel-head { padding: 1.75rem var(--pad-x) 1.125rem; border-bottom: 1px solid var(--line); }
.ph-kicker {
  display: block; font-family: var(--f-mono); font-size: 0.63rem;
  letter-spacing: 0.2em; color: var(--accent); margin-bottom: 0.4rem;
}
.panel-head h1 {
  margin: 0; font-family: var(--f-display);
  font-size: 1.75rem; font-weight: 700; letter-spacing: -0.01em; color: var(--ink);
}
.panel-head h1 b { color: var(--accent); font-weight: 700; }

.panel-body { padding: 0 var(--pad-x); overflow-y: auto; overflow-x: hidden; flex: 1 1 auto; min-height: 0; }
.panel-body::-webkit-scrollbar { width: 0.56rem; }
.panel-body::-webkit-scrollbar-thumb { background: #c5c2ba; border-radius: 0.5rem; }

/* ---------------- spec-sheet steps ---------------- */
.step {
  position: relative;
  padding: 1.375rem 0 1.375rem 3.5rem;
  border-bottom: 1px solid var(--line-2);
}
.step.disabled { opacity: .42; pointer-events: none; }
.node {
  position: absolute; left: 0; top: 1.375rem;
  width: 2.75rem;
  font-family: var(--f-display); font-weight: 700; font-size: 2.125rem; line-height: 1;
  color: var(--muted);
  transition: color .2s;
}
.step.active .node { color: var(--accent); }
.step.done .node { color: var(--ok); }

.step .head {
  font-family: var(--f-display);
  font-size: 1.0625rem; font-weight: 600; color: var(--ink);
  margin-bottom: 0.5rem;
}

/* ---------------- form controls ---------------- */
label {
  display: block; margin: 0.875rem 0 0.4rem;
  font-family: var(--f-mono); font-size: 0.63rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-soft);
}
.head + label, .toggle-body > *:first-child label { margin-top: 0; }

input[type="text"], input[type="number"], select {
  width: 100%; padding: 0.6rem 0.7rem;
  background: var(--surface); border: 1px solid var(--line-input);
  border-radius: 0; color: var(--ink); font-family: var(--f-sans); font-size: 0.81rem;
  outline: none; transition: border-color .15s, box-shadow .15s;
}
select { cursor: pointer; }
input[type="number"] {
  font-family: var(--f-mono);
  font-size: 0.78rem; font-variant-numeric: tabular-nums;
}
input:focus-visible, select:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 0.19rem var(--accent-soft);
}

/* segmented control (Round / Oval) */
.seg { display: flex; gap: 0.375rem; }
.seg-btn {
  flex: 1; padding: 0.55rem 0.5rem; cursor: pointer;
  background: var(--surface); border: 1px solid var(--line-input);
  border-radius: 0; color: var(--ink); font-family: var(--f-sans); font-size: 0.81rem;
  transition: border-color .15s, background .15s, color .15s;
}
.seg-btn:hover { border-color: var(--accent); }
.seg-btn.selected {
  background: var(--ink); border-color: var(--ink); color: var(--panel); font-weight: 500;
}
.seg-btn:focus-visible {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 0.19rem var(--accent-soft);
}

/* custom file picker */
.file-input {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}
.filepick { display: flex; align-items: center; gap: 0.75rem; min-width: 0; }
.btn-file {
  display: inline-block; margin: 0; flex-shrink: 0; white-space: nowrap; text-transform: none; letter-spacing: 0;
  padding: 0.55rem 1rem; cursor: pointer;
  background: var(--ink); color: var(--panel);
  border: 1px solid var(--ink); border-radius: 0;
  font-family: var(--f-sans); font-size: 0.78rem; transition: background .15s;
}
.btn-file:hover { background: #000; }
.filepick:focus-within .btn-file { outline: 2px solid var(--accent); outline-offset: 2px; }
.file-name {
  font-family: var(--f-mono); font-size: 0.72rem; color: var(--muted); min-width: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.file-status {
  margin-top: 0.625rem; min-height: 0.875rem;
  font-family: var(--f-mono); font-size: 0.72rem; color: var(--ink-soft);
}
.file-status.ok { color: var(--ok); }
.file-status.error { color: var(--danger); }

.spin {
  display: inline-block; width: 0.75rem; height: 0.75rem;
  border: 2px solid rgba(42, 42, 42, .2); border-top-color: var(--accent);
  border-radius: 50%; margin-right: 0.5rem; vertical-align: -2px;
  animation: spin .7s linear infinite;
}

input[type="range"] { width: 100%; accent-color: var(--accent); margin-top: 0.25rem; cursor: pointer; }

.row { display: flex; gap: 0.75rem; }
.row > * { flex: 1 1 0; min-width: 0; }

.inline { display: inline-flex !important; align-items: center; gap: 0.5rem; margin: 0.5rem 0 0; color: var(--ink); font-family: var(--f-sans); text-transform: none; letter-spacing: 0; font-size: 0.81rem; cursor: pointer; }
.inline input { width: auto; accent-color: var(--accent); }

.toggle-body { margin-top: 0.69rem; }
.toggle-step[data-disabled="true"] .toggle-body { opacity: .38; pointer-events: none; }

/* fine-tuning disclosure */
.options { padding: 1.25rem 0 1.5rem; }
.options-toggle {
  width: 100%; display: flex; align-items: center; gap: 0.55rem;
  background: transparent; border: none; padding: 0; cursor: pointer;
  color: var(--ink); font-family: var(--f-display); font-weight: 600; font-size: 0.94rem;
}
.opt-hint {
  font-family: var(--f-mono); font-weight: 400; font-size: 0.56rem;
  color: var(--muted); text-transform: uppercase; letter-spacing: .14em;
}
.opt-caret { margin-left: auto; width: 0.85rem; height: 0.85rem; position: relative; }
.opt-caret::before, .opt-caret::after { content: ""; position: absolute; background: var(--ink-soft); }
.opt-caret::before { left: 0; right: 0; top: 50%; height: 1.5px; transform: translateY(-50%); }
.opt-caret::after  { top: 0; bottom: 0; left: 50%; width: 1.5px; transform: translateX(-50%); transition: opacity .2s; }
.options.open .opt-caret::after { opacity: 0; }
.options-body { padding: 0.4rem 0 0; }
.options-body[hidden] { display: none; }
.opt-group { margin-top: 1.1rem; padding-top: 1.1rem; border-top: 1px solid var(--line-2); }
.opt-group:first-child { margin-top: 0.6rem; padding-top: 0; border-top: none; }
.opt-title {
  font-family: var(--f-display); font-weight: 600; font-size: 0.88rem;
  color: var(--ink); margin-bottom: 0.1rem;
}

.unit {
  float: right; color: var(--accent);
  font-family: var(--f-mono); font-variant-numeric: tabular-nums; font-size: 0.69rem;
}

/* ---------------- buttons ---------------- */
button {
  font-family: inherit; cursor: pointer; border-radius: 0;
  border: 1px solid var(--line-input);
  transition: filter .15s, background .15s, transform .05s, opacity .15s, color .15s;
}
button:disabled { cursor: not-allowed; }
button:active:not(:disabled) { transform: translateY(1px); }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.foot-actions { display: flex; gap: 0.625rem; }

.btn-primary {
  flex: 1; padding: 0.94rem;
  font-family: var(--f-display); font-size: 0.94rem; font-weight: 700; letter-spacing: .005em;
  color: var(--panel); border: none; background: var(--accent);
}
.btn-primary:hover:not(:disabled) { filter: brightness(1.06); }
.btn-primary:disabled { opacity: .5; }

.btn-ghost {
  padding: 0.94rem 1.25rem;
  font-family: var(--f-sans); font-size: 0.81rem; color: var(--ink);
  background: var(--surface); border: 1px solid var(--line-input);
}
.btn-ghost:not(:disabled) { background: var(--ink); color: var(--panel); border-color: var(--ink); }
.btn-ghost:not(:disabled):hover { background: #000; }
.btn-ghost:disabled { color: #c4c1ba; }

/* ---------------- footer / status ---------------- */
.panel-foot { padding: 1.125rem var(--pad-x) 1.5rem; border-top: 1px solid var(--line); background: var(--panel-foot); }

#warnings {
  margin-top: 0.85rem; font-family: var(--f-mono); font-size: 0.63rem; letter-spacing: .08em;
  line-height: 1.5; white-space: pre-wrap; min-height: 1rem; color: var(--ink-soft);
}
#warnings.warn, #warnings.info {
  color: var(--warn); background: #FBEAD9; border-left: 2px solid var(--accent);
  padding: 0.5rem 0.7rem; letter-spacing: 0; font-family: var(--f-sans); font-size: 0.75rem;
}
#warnings.error {
  color: #8a2a1e; background: #F7DAD5; border-left: 2px solid var(--danger);
  padding: 0.5rem 0.7rem; letter-spacing: 0; font-family: var(--f-sans); font-size: 0.75rem;
}
#warnings.ok, #warnings.success { color: var(--ok); }

.spinner {
  display: inline-block; width: 0.81rem; height: 0.81rem;
  border: 2px solid rgba(245, 244, 240, .35); border-top-color: var(--panel);
  border-radius: 50%; margin-right: 0.5rem; vertical-align: -2px;
  animation: spin .7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .spinner, .spin { animation-duration: 1.4s; }
  button:active:not(:disabled) { transform: none; }
}

/* ---- theme gallery ---- */
.gallery {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.625rem;
  margin-top: 0.25rem;
}
.theme-card {
  display: flex; flex-direction: column; gap: 0.4rem; padding: 0.5rem;
  min-width: 0;
  background: var(--surface); border: 1px solid var(--line-input);
  border-radius: 0; cursor: pointer; text-align: center;
  transition: border-color .15s, box-shadow .15s;
}
.theme-card:hover { border-color: var(--muted); }
.theme-card.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.theme-thumb {
  aspect-ratio: 4 / 3; overflow: hidden;
  background: repeating-linear-gradient(45deg, #ECEAE4 0 7px, #E2DFD8 7px 14px);
  display: grid; place-items: center;
}
.theme-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.theme-thumb .spin { width: 1.4rem; height: 1.4rem; border-width: 3px; margin: 0; }
.theme-flat { color: var(--muted); font-family: var(--f-mono); font-size: 0.56rem; letter-spacing: .08em; }
.theme-name {
  font-family: var(--f-sans); font-size: 0.72rem; color: var(--ink);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

/* ---------------- responsive: stack on narrow / short screens ---------------- */
@media (max-width: 760px), (max-height: 540px) {
  #app { flex-direction: column; }
  #rail { display: none; }
  #viewport { height: 45vh; flex: 0 0 auto; }
  #panel { width: auto; flex: 1 1 auto; border-left: none; border-top: 1px solid var(--line); }
}