/*
 * This file is a derivative work of the C++ implementation released
 * alongside Chadwick and James, "Animating Fire with Sound," SIGGRAPH 2011.
 * See https://www.cs.cornell.edu/projects/Sound/fire/ for the original.
 *
 * Copyright (c) 2011, Jeffrey Chadwick. All rights reserved.
 * BSD 2-Clause License (see ./LICENSE).
 */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f5f5f5;
  --panel: #ffffff;
  --border: #d8d8d8;
  --accent: #2563eb;
  --accent-soft: #eef2ff;
  --text: #1a1a1a;
  --muted: #555;
  --warn: #b1300d;
  --grid: #e3e3ee;
}
html, body { background: var(--bg); color: var(--text); }
body {
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  padding: 1.5rem 1rem 3rem;
  max-width: 1080px;
  margin: 0 auto;
}
h1 { font-size: 1.55rem; margin-bottom: 0.2rem; }
.subtitle { color: var(--muted); font-size: 0.95rem; margin-bottom: 0.4rem; }
.citation { color: var(--muted); font-size: 0.85rem; margin-bottom: 1rem; }
.citation a { color: var(--accent); }
.nav { font-size: 0.85rem; color: var(--muted); margin-bottom: 0.6rem; }
.nav a { color: var(--accent); text-decoration: none; }
section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
}
h2 { font-size: 1rem; margin-bottom: 0.6rem; }

#banner {
  background: #fff5f0;
  border: 1px solid #f1bb9b;
  color: #9b3e0d;
  padding: 0.7rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}
#banner code {
  background: rgba(0,0,0,0.05);
  padding: 0.05rem 0.3rem;
  border-radius: 3px;
  font-size: 0.85em;
}
#banner.error {
  background: #fef2f2;
  border-color: #fecaca;
  color: #b91c1c;
}

.pair-rows {
  display: flex; flex-direction: column; gap: 0.4rem;
}
.example-row {
  display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center;
}
.example-row .row-label {
  font-size: 0.78rem; color: var(--muted); font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase;
  min-width: 4.5rem;
}
.example-row button, .example-row label {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.35rem 0.8rem;
  border-radius: 4px;
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
}
.example-row button.active {
  background: var(--accent); color: #fff;
}
.example-row input[type="file"] { display: none; }

/* Training row uses the amber palette so it visually echoes the
   training PSD line in the Spectra plot (.spectrum-legend .amber). */
#training-row button, #training-row label {
  color: #b45309;            /* amber-700, readable on white/soft */
  border-color: #f59e0b;     /* amber-500, matches spectrum line */
  background: #fffbeb;       /* amber-50 */
}
#training-row button.active {
  background: #f59e0b; color: #fff; border-color: #f59e0b;
}
.pair-status {
  font-size: 0.8rem; color: var(--muted);
  padding-top: 0.15rem;
}
.pair-status .excerpt-tag {
  font-style: italic; color: var(--muted); margin-left: 0.25rem;
}
.pair-status .custom-tag {
  font-style: italic; color: var(--accent); margin-left: 0.25rem;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.6rem 1.1rem;
}
.ctrl { display: grid; grid-template-columns: 1fr; }
.ctrl label {
  font-size: 0.8rem; color: var(--muted); display: flex;
  justify-content: space-between; margin-bottom: 0.15rem;
}
.ctrl label span.val { color: var(--text); font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.78rem; }
.ctrl input[type="range"] { width: 100%; }
.ctrl input[type="number"] { width: 5rem; padding: 0.15rem 0.3rem; }

.controls-actions {
  display: flex; gap: 0.6rem; align-items: center; margin-top: 0.8rem;
  flex-wrap: wrap;
}
.controls-actions button {
  background: var(--accent); color: #fff; border: 0;
  padding: 0.45rem 1rem; border-radius: 4px; cursor: pointer;
  font-size: 0.9rem;
}
.controls-actions button:disabled { background: #aaa; cursor: progress; }
.controls-actions button.secondary {
  background: var(--accent-soft); color: var(--accent); border: 1px solid var(--accent);
}
.controls-actions .auto-process-toggle {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-size: 0.8rem; color: var(--muted); white-space: nowrap;
  cursor: pointer;
}
.controls-actions .progress {
  flex: 1; min-width: 100px; height: 8px; background: var(--accent-soft);
  border-radius: 4px; overflow: hidden;
}
.controls-actions .progress > div {
  height: 100%; background: var(--accent); width: 0%;
  transition: width 0.15s linear;
}
.controls-actions .status { font-size: 0.8rem; color: var(--muted); white-space: nowrap; }
.controls-actions .status.warn { color: var(--warn); }

.spec-and-playback {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(220px, 1fr);
  gap: 1.1rem;
}
.spectrum-pane > h2,
.playback-pane > h2 { margin-bottom: 0.4rem; }
.spectrum-canvas-wrap {
  width: 100%; height: 260px;
  background: #1c1d2b; border-radius: 6px; overflow: hidden;
}
.spectrum-canvas-wrap canvas {
  display: block; width: 100%; height: 100%;
}
.spectrum-legend {
  display: flex; flex-wrap: wrap; gap: 0.35rem 0.9rem;
  font-size: 0.72rem; color: var(--muted);
  margin-top: 0.45rem;
  align-items: center;
}
.spectrum-legend .swatch {
  display: inline-block; vertical-align: middle; margin-right: 0.3rem;
}
.spectrum-legend .swatch.line { width: 16px; height: 0; border-top: 2px solid currentColor; }
.spectrum-legend .blue   { color: #60a5fa; }
.spectrum-legend .amber  { color: #f59e0b; }
.spectrum-legend .green  { color: #22c55e; }

.playback-pane .player { margin-bottom: 0.55rem; }
.playback-pane .player:last-child { margin-bottom: 0; }
.player {
  background: #fafafe;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.55rem 0.7rem;
}
.player h3 { font-size: 0.8rem; margin-bottom: 0.3rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.player .player-row { display: flex; gap: 0.4rem; align-items: center; }
.player button {
  background: var(--accent); color: #fff; border: 0;
  padding: 0.25rem 0.55rem; border-radius: 4px; cursor: pointer; font-size: 0.78rem;
}
.player button:disabled { background: #ccc; cursor: not-allowed; }
.player input[type="range"] { flex: 1; min-width: 30px; }
.player .meta {
  font-size: 0.72rem; color: var(--muted); margin-top: 0.25rem;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}

.pyramid-stack { padding: 0.6rem 1rem; }
.pyramid-stack .level-row {
  display: grid; grid-template-columns: 60px 1fr; align-items: center;
  gap: 0.5rem; margin-bottom: 0.3rem;
}
.pyramid-stack .level-row:last-child { margin-bottom: 0; }
.pyramid-stack .level-label {
  font-size: 0.72rem; color: var(--muted);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  text-align: right;
}
.pyramid-stack canvas {
  display: block; width: 100%; height: 28px;
  background: #1c1d2b; border-radius: 3px;
}

.specs { padding: 0.6rem 1rem; }
.spec-block { margin-top: 0.6rem; }
.spec-block:first-of-type { margin-top: 0; }
.spec-block h3 {
  font-size: 0.78rem; color: var(--muted); margin-bottom: 0.2rem;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.spec-canvas-wrap {
  position: relative; width: 100%; height: 180px;
  background: #1c1d2b; border-radius: 4px; overflow: hidden;
}
.spec-canvas-wrap canvas {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  display: block;
}
.spec-canvas-wrap .axis-label {
  position: absolute; color: rgba(255,255,255,0.6); font-size: 0.65rem;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  background: rgba(0,0,0,0.35); padding: 0 4px; border-radius: 2px;
}

details {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1.05rem;
  margin-top: 1rem;
}
details > summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  user-select: none;
}
details > summary:hover { color: var(--accent); }
details[open] > summary { margin-bottom: 0.4rem; }
.info-content { margin-top: 0.6rem; font-size: 0.88rem; color: #2a2a2a; line-height: 1.6; }
.info-content p { margin-bottom: 0.55rem; }
.info-content ul, .info-content ol { margin: 0.3rem 0 0.6rem 1.25rem; }
.info-content li { margin-bottom: 0.25rem; }
.info-content em { font-style: italic; }
.info-content h4 { font-size: 0.92rem; margin: 0.85rem 0 0.3rem; color: #1a1a1a; }
.info-content .ref { font-size: 0.82rem; color: #555; }
.info-content .eq {
  display: block;
  margin: 0.4rem 0 0.4rem 1.25rem;
  font-family: 'Times New Roman', 'Cambria', Georgia, serif;
  font-size: 1rem;
  line-height: 1.55;
}
.info-content .eq-inline {
  font-family: 'Times New Roman', 'Cambria', Georgia, serif;
}
.info-content code {
  background: var(--accent-soft);
  padding: 0.05rem 0.3rem;
  border-radius: 3px;
  font-size: 0.92em;
}

footer {
  margin-top: 1.5rem;
  font-size: 0.78rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 0.8rem;
  line-height: 1.55;
}
footer a { color: var(--muted); text-decoration: underline; }
footer a:hover { color: var(--accent); }
footer .links { display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; margin: 0.4rem 0; }
footer .disclaimer {
  font-size: 0.72rem; opacity: 0.8; margin-top: 0.5rem;
  border-left: 2px solid var(--border); padding-left: 0.6rem;
}

@media (max-width: 760px) {
  .spec-and-playback { grid-template-columns: 1fr; }
}