:root {
  --bg: #15161a;
  --panel: #1e2026;
  --panel-edge: #2c2f37;
  --text: #e8e8e6;
  --text-dim: #9a9da6;
  --accent: #e8694a;
  --accent-soft: #e8694a33;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  padding: 1.2rem 1.5rem 0.6rem;
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
}

.app-logo {
  width: 96px;
  height: 96px;
  border-radius: 22%;
  flex: none;
}

h1 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: 0.01em;
}

.version {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 5px;
  padding: 0.1rem 0.4rem;
  vertical-align: middle;
  letter-spacing: 0;
}

.subtitle {
  margin: 0.3rem 0 0;
  color: var(--text-dim);
  font-size: 0.85rem;
  max-width: 60ch;
}

main {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem 1.5rem;
}

#setup {
  columns: 300px 3;
  column-gap: 0.8rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  margin: 0 0 0.8rem;
  break-inside: avoid;
}

.panel h2 {
  margin: 0 0 0.6rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.phase-tag {
  font-size: 0.65rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  vertical-align: middle;
  text-transform: none;
  letter-spacing: 0;
}

.file-drop {
  display: block;
  border: 1.5px dashed var(--panel-edge);
  border-radius: 8px;
  padding: 1.2rem 0.8rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.file-drop:hover, .file-drop.dragover {
  border-color: var(--accent);
  color: var(--text);
}

.file-drop input { display: none; }

.radio {
  display: block;
  font-size: 0.82rem;
  margin-bottom: 0.3rem;
  cursor: pointer;
}

.radio input { accent-color: var(--accent); margin-right: 0.35rem; }

.adv-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin: 0.9rem 0 0.35rem;
}

select {
  width: 100%;
  font: inherit;
  font-size: 0.82rem;
  padding: 0.4rem 0.5rem;
  border-radius: 7px;
  border: 1px solid var(--panel-edge);
  background: var(--panel);
  color: var(--text);
}

.slider-row {
  margin-bottom: 0.55rem;
}

.slider-row label {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 0.15rem;
}

.slider-row .value { color: var(--text); font-variant-numeric: tabular-nums; }

.slider-row input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.button-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.button-row.column { flex-direction: column; }

button {
  font: inherit;
  font-size: 0.8rem;
  padding: 0.45rem 0.7rem;
  border-radius: 7px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  flex: 1;
}

button.secondary {
  background: transparent;
  border-color: var(--panel-edge);
  color: var(--text);
}

button:disabled {
  opacity: 0.4;
  cursor: default;
}

button:not(:disabled):hover { filter: brightness(1.12); }

/* anchor styled to match a .secondary button (used for cross-page links) */
.btn-link {
  font: inherit;
  font-size: 0.8rem;
  padding: 0.45rem 0.7rem;
  border-radius: 7px;
  border: 1px solid var(--panel-edge);
  background: transparent;
  color: var(--text);
  text-align: center;
  text-decoration: none;
  display: block;
}

.btn-link:hover { filter: brightness(1.12); border-color: var(--accent); }

.hint {
  font-size: 0.74rem;
  color: var(--text-dim);
  line-height: 1.45;
  margin: 0.5rem 0 0;
}

#views {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg);
  padding-bottom: 0.8rem;
}

/* Pre-Compensation sliders sit in a compact multi-column grid so the panel
   stays a short band directly under the previews. */
#sliders {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  column-gap: 1.4rem;
}

/* Load + preview are one area: when empty the previews collapse and the area
   is the uploader; once a photo is loaded the tiles + a Replace button show. */
#views.empty .view-card,
#views.empty #btn-replace { display: none; }

#drop-zone { grid-column: 1 / -1; }
#views.empty #drop-zone { padding: 4rem 0; }
#views:not(.empty) #drop-zone { display: none; }

#btn-replace {
  grid-column: 1 / -1;
  justify-self: center;
  flex: none;
  padding: 0.4rem 1.2rem;
}

.view-card {
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  padding: 0.6rem;
}

.view-card.highlight { border-color: var(--accent); }

.view-card canvas {
  width: 100%;
  max-height: 26vh;
  object-fit: contain;
  display: block;
  border-radius: 6px;
  background: #000;
}

.view-card figcaption {
  font-size: 0.75rem;
  color: var(--text-dim);
  padding-top: 0.45rem;
  text-align: center;
}

.view-card.highlight figcaption { color: var(--accent); }

footer {
  padding: 0 1.5rem 1.5rem;
}

footer p {
  font-size: 0.72rem;
  color: var(--text-dim);
  max-width: 80ch;
}

.mini-toggle {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.mini-toggle label { cursor: pointer; }
.mini-toggle input { accent-color: var(--accent); margin-right: 0.2rem; vertical-align: middle; }

@media (max-width: 1000px) {
  /* narrow: previews on top but not pinned (a 2x2 grid is too tall to pin) */
  #views { grid-template-columns: 1fr 1fr; position: static; }
  .view-card canvas { max-height: none; }
}

@media (max-width: 620px) {
  #views { grid-template-columns: 1fr 1fr; gap: 0.5rem; }
}

/* Mobile order: film, previews (which double as the uploader), correction
   strength, pre-compensation, then the rest. display:contents dissolves the
   #setup grouping so its panels become siblings of the previews/pre-comp and
   can be interleaved with order. */
@media (max-width: 700px) {
  .app-logo { width: 192px; height: 192px; }
  #setup { display: contents; }
  #film-panel { order: 1; }
  #views { order: 2; }
  #strength-panel { order: 3; }
  #precomp { order: 4; }
  #export-panel { order: 5; }
  #calibration-panel { order: 6; }
}