/* Stem Studio — dark studio theme.
   Colors follow the validated dark-mode viz palette:
   surface #1a1a19 · page #0d0d0d · ink #fff / #c3c2b7 / #898781
   series: blue #3987e5 · yellow #c98500 · violet #9085e9 · aqua #199e70 */

:root {
  --page: #0d0d0d;
  --surface: #1a1a19;
  --surface-2: #222220;
  --ink: #ffffff;
  --ink-2: #c3c2b7;
  --muted: #898781;
  --grid: #2c2c2a;
  --baseline: #383835;
  --border: rgba(255, 255, 255, 0.10);
  --accent: #3987e5;
  --accent-soft: rgba(57, 135, 229, 0.16);
  --aqua: #199e70;
  --good: #0ca30c;
  --warning: #fab219;
  --serious: #ec835a;
  --critical: #d03b3b;
  --vocals: #3987e5;
  --drums: #c98500;
  --bass: #9085e9;
  --other: #199e70;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
}

.hidden { display: none !important; }
.muted { color: var(--muted); font-weight: 400; font-size: 0.85em; }

/* ---------------------------------------------------------- layout */
.topbar {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 28px;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: rgba(13,13,13,0.92);
  backdrop-filter: blur(6px); z-index: 10;
}
.logo { font-weight: 700; font-size: 17px; letter-spacing: 0.4px; }
.track-name { color: var(--ink-2); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.view { max-width: 1060px; margin: 0 auto; padding: 26px 20px 80px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  margin-bottom: 18px;
}
.card h2 { font-size: 16px; margin-bottom: 12px; }
.card h3 { font-size: 13px; margin: 18px 0 8px; color: var(--ink-2); }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 10px; flex-wrap: wrap; }
.card-head h2 { margin: 0; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 860px) { .grid-2 { grid-template-columns: 1fr; } }

/* --------------------------------------------------------- buttons */
button { font: inherit; cursor: pointer; border: none; border-radius: 8px; color: var(--ink); }
.primary-btn {
  background: var(--accent); color: #fff; padding: 9px 18px; font-weight: 600;
}
.primary-btn:hover { filter: brightness(1.12); }
.primary-btn:disabled { opacity: 0.45; cursor: default; filter: none; }
.secondary-btn {
  background: var(--surface-2); border: 1px solid var(--border);
  padding: 9px 16px; font-weight: 500;
}
.secondary-btn:hover { border-color: var(--muted); }
.ghost-btn { background: transparent; color: var(--ink-2); padding: 7px 12px; }
.ghost-btn:hover { color: var(--ink); background: var(--surface-2); }

/* ---------------------------------------------------------- upload */
.upload-hero { text-align: center; padding-top: 60px; }
.upload-hero h1 { font-size: 30px; margin-bottom: 10px; }
.upload-hero .sub { color: var(--ink-2); max-width: 520px; margin: 0 auto 34px; }
.dropzone {
  border: 2px dashed var(--baseline); border-radius: 16px;
  padding: 48px 30px; max-width: 520px; margin: 0 auto;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone.drag { border-color: var(--accent); background: var(--accent-soft); }
.dz-icon { font-size: 42px; color: var(--accent); margin-bottom: 8px; }
.dz-text { color: var(--ink-2); margin-bottom: 14px; }
.dz-text span { color: var(--muted); }
.dz-hint { margin-top: 14px; color: var(--muted); font-size: 12px; letter-spacing: 1px; }
.upload-status { display: flex; align-items: center; justify-content: center; gap: 10px; margin-top: 22px; color: var(--ink-2); }

.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid var(--baseline); border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ------------------------------------------------------- transport */
.transport { display: flex; align-items: center; gap: 10px; }
.play-btn {
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--accent); color: #fff; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
}
.play-btn:hover { filter: brightness(1.12); }
.time { font-variant-numeric: tabular-nums; color: var(--ink-2); }
.time-sep { color: var(--muted); }

.src-toggle { display: flex; background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.src-toggle button { background: transparent; color: var(--ink-2); padding: 7px 14px; border-radius: 0; font-size: 13px; }
.src-toggle button.active { background: var(--accent); color: #fff; }
.src-toggle button:disabled { opacity: 0.35; cursor: default; }

.main-wave { width: 100%; height: 120px; display: block; cursor: pointer; border-radius: 6px; background: var(--page); touch-action: none; }
.wave-hint { font-size: 11px; margin-top: 6px; }

.sel-bar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-top: 10px; padding: 8px 12px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px;
}
.sel-bar .secondary-btn, .sel-bar .ghost-btn { padding: 6px 12px; font-size: 13px; }
#btn-loop.loop-on { background: var(--warning); border-color: var(--warning); color: #1a1a19; font-weight: 700; }
#sel-info { font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------- stat tiles */
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.stat {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 12px;
}
.stat .v { font-size: 20px; font-weight: 650; }
.stat .u { font-size: 11px; color: var(--muted); margin-left: 2px; }
.stat .l { font-size: 11.5px; color: var(--muted); margin-top: 1px; }

/* --------------------------------------------------------- spectral */
.spectral { display: flex; align-items: flex-end; gap: 8px; height: 96px; padding-top: 6px; }
.sp-band { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 5px; height: 100%; justify-content: flex-end; }
.sp-bar-wrap { width: 100%; flex: 1; display: flex; align-items: flex-end; }
.sp-bar {
  width: 100%; background: var(--accent);
  border-radius: 4px 4px 0 0; min-height: 2px;
  position: relative;
}
.sp-band:hover .sp-bar { filter: brightness(1.2); }
.sp-band .pct { font-size: 10.5px; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.sp-band .lbl { font-size: 10.5px; color: var(--muted); border-top: 1px solid var(--baseline); width: 100%; text-align: center; padding-top: 3px; }

/* ----------------------------------------------------------- issues */
.issues { list-style: none; }
.issues li { display: flex; gap: 8px; align-items: baseline; padding: 3px 0; color: var(--ink-2); font-size: 13.5px; }
.sev { font-size: 11px; font-weight: 700; padding: 1px 7px; border-radius: 20px; white-space: nowrap; }
.sev.high { background: rgba(208,59,59,0.18); color: var(--critical); }
.sev.medium { background: rgba(236,131,90,0.16); color: var(--serious); }
.sev.low { background: rgba(250,178,25,0.14); color: var(--warning); }
.issues .ok { color: var(--good); }

/* ---------------------------------------------------------- enhance */
.enh-target-row { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.enh-target-row label { color: var(--muted); font-size: 13px; }
select {
  background: var(--surface-2); color: var(--ink); border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 10px; font: inherit;
}
.enh-modes { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }

.remaster-btn {
  display: block; width: 100%; text-align: left;
  background: linear-gradient(135deg, rgba(57,135,229,0.22), rgba(144,133,233,0.18));
  border: 1px solid var(--accent); border-radius: 12px;
  padding: 14px 16px; margin-bottom: 14px;
}
.remaster-btn:hover { background: linear-gradient(135deg, rgba(57,135,229,0.34), rgba(144,133,233,0.28)); }
.remaster-btn:disabled { opacity: 0.55; cursor: default; }
.rm-title { display: block; font-weight: 700; font-size: 15px; margin-bottom: 3px; }
.rm-desc { display: block; color: var(--ink-2); font-size: 12.5px; line-height: 1.45; }

.presets { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
@media (max-width: 640px) { .presets { grid-template-columns: 1fr; } }
.preset {
  display: grid; grid-template-columns: 30px 1fr; grid-template-rows: auto auto;
  column-gap: 8px; align-items: center; text-align: left;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 9px 11px;
}
.preset:hover { border-color: var(--accent); background: var(--accent-soft); }
.preset .p-icon { grid-row: 1 / 3; font-size: 19px; }
.preset .p-name { font-weight: 600; font-size: 13px; }
.preset .p-desc { color: var(--muted); font-size: 11.5px; grid-column: 2; }
.enh-status { display: flex; align-items: center; gap: 10px; margin-top: 14px; color: var(--ink-2); }
.enh-result {
  margin-top: 14px; padding: 12px 14px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px;
  font-size: 13.5px; color: var(--ink-2);
}
.enh-result .delta { color: var(--good); font-weight: 600; }

.advanced { margin-top: 16px; border-top: 1px solid var(--border); padding-top: 14px; }
.repair-row { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.repair-row label { color: var(--ink-2); font-size: 12.5px; display: flex; gap: 7px; align-items: center; }
.sliders { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 22px; }
@media (max-width: 640px) { .sliders { grid-template-columns: 1fr; } }
.slider-row { display: grid; grid-template-columns: 118px 1fr 46px; align-items: center; gap: 10px; font-size: 12.5px; }
.slider-row label { color: var(--ink-2); }
.slider-row output { color: var(--ink); text-align: right; font-variant-numeric: tabular-nums; font-size: 12px; }
input[type="range"] { accent-color: var(--accent); width: 100%; }
.adv-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 14px; }

/* ------------------------------------------------------------ stems */
.sep-progress { display: flex; align-items: center; gap: 12px; margin: 8px 0 14px; font-size: 13px; }
.bar { flex: 0 0 220px; height: 8px; background: var(--surface-2); border-radius: 20px; overflow: hidden; }
.bar-fill { height: 100%; width: 0%; background: var(--accent); border-radius: 20px; transition: width 0.4s; }
#sep-pct { font-variant-numeric: tabular-nums; color: var(--ink-2); width: 38px; }

.stem-list { display: flex; flex-direction: column; gap: 10px; }
.stem-row {
  background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px;
}
.stem-top {
  display: grid; grid-template-columns: 26px 150px 1fr auto auto; gap: 12px;
  align-items: center;
}
@media (max-width: 860px) { .stem-top { grid-template-columns: 26px 90px 1fr; } }
.stem-id { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 13.5px; }
.stem-chip { width: 10px; height: 10px; border-radius: 3px; }
.stem-badge { font-size: 10px; color: var(--good); border: 1px solid var(--good); border-radius: 10px; padding: 0 6px; }
.stem-wave { width: 100%; height: 44px; display: block; background: var(--page); border-radius: 5px; }
.stem-ms { display: flex; gap: 6px; }

.stem-mixer {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px 16px;
  margin-top: 9px; padding-top: 9px; border-top: 1px solid var(--border);
}
@media (max-width: 860px) { .stem-mixer { grid-template-columns: repeat(2, 1fr); } }
.stem-mixer label {
  display: grid; grid-template-columns: 32px 1fr 40px; align-items: center; gap: 6px;
  font-size: 11px; color: var(--muted);
}
.stem-mixer output { font-size: 10.5px; color: var(--ink-2); text-align: right; font-variant-numeric: tabular-nums; }
.ms-btn {
  width: 26px; height: 24px; font-size: 11px; font-weight: 700;
  background: var(--surface); border: 1px solid var(--border); color: var(--muted);
  border-radius: 6px;
}
.ms-btn.on-m { background: var(--critical); border-color: var(--critical); color: #fff; }
.ms-btn.on-s { background: var(--warning); border-color: var(--warning); color: #1a1a19; }
.stem-links { display: flex; gap: 6px; justify-content: flex-end; }
.stem-links a, .dl-link {
  color: var(--accent); text-decoration: none; font-size: 12.5px;
  border: 1px solid var(--border); padding: 3px 9px; border-radius: 6px;
}
.stem-links a:hover, .dl-link:hover { border-color: var(--accent); }

.export-row { display: flex; align-items: center; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
.chk { color: var(--ink-2); font-size: 13px; display: flex; gap: 6px; align-items: center; }

/* ------------------------------------------------------- style engine */
.style-box {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 12px; padding: 12px 14px; margin-bottom: 14px;
  display: flex; flex-direction: column; gap: 10px;
}
.style-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; font-size: 14px; }
.style-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.style-row select { flex: 1; min-width: 160px; }
.strength-lbl {
  display: grid; grid-template-columns: auto 1fr 44px; gap: 10px; align-items: center;
  width: 100%; font-size: 12.5px; color: var(--ink-2);
}
.strength-lbl output { text-align: right; font-variant-numeric: tabular-nums; font-size: 12px; }

/* ----------------------------------------------------------- DJ deck */
.dj-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
@media (max-width: 860px) { .dj-grid { grid-template-columns: 1fr; } }
.dj-col h3 { margin-top: 4px; }
.dj-col .slider-row { margin-bottom: 10px; }
.dj-col .chk { margin: 7px 0; font-size: 12.5px; }
.dj-fx-list { display: flex; flex-direction: column; gap: 6px; margin-top: 10px; }
.dj-fx-row {
  display: grid; grid-template-columns: 1fr auto 28px; gap: 10px; align-items: center;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 6px 6px 12px; font-size: 13px;
}
.regen-box { border-color: rgba(144, 133, 233, 0.5); }
.regen-box .primary-btn { background: #9085e9; }

/* ---------------------------------------------------- preview & sugg */
.preview-chk { margin-top: 12px; font-size: 12.5px; }
.preview-bar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-top: 12px; padding: 10px 14px;
  background: rgba(250, 178, 25, 0.10); border: 1px solid var(--warning);
  border-radius: 10px; font-size: 13px; color: var(--ink-2);
}
.preview-bar .primary-btn, .preview-bar .ghost-btn { padding: 6px 12px; font-size: 13px; }

.rm-report { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--border); }
.rm-report ul { margin: 4px 0 0 18px; }
.rm-report li { font-size: 12.5px; padding: 1px 0; }

.sug-list { display: flex; flex-direction: column; gap: 8px; }
.sug-row {
  display: flex; align-items: center; gap: 14px; justify-content: space-between;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 14px;
}
.sug-txt { display: flex; flex-direction: column; gap: 1px; font-size: 13.5px; }
.sug-txt .muted { font-size: 12px; }
.sug-add { white-space: nowrap; }

.layer-list { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.layer-row {
  display: grid; grid-template-columns: 12px auto 1fr 28px 28px; gap: 10px;
  align-items: center; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 10px; padding: 8px 14px;
  font-size: 13px;
}

.stem-play { color: var(--accent); font-size: 10px; }
.stem-play:hover { border-color: var(--accent); }

/* -------------------------------------------------------- downloads */
.downloads { display: flex; flex-wrap: wrap; gap: 8px; }

/* ------------------------------------------------------------ modal */
.modal {
  position: fixed; top:0;right:0;bottom:0;left:0; background: rgba(0,0,0,0.6);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.modal-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 22px 26px; width: min(560px, 92vw);
}
.modal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.wiz-question { font-size: 18px; font-weight: 600; margin: 14px 0 16px; }
.wiz-options { display: flex; flex-direction: column; gap: 8px; }
.wiz-opt {
  text-align: left; background: var(--surface-2); border: 1px solid var(--border);
  padding: 12px 14px; border-radius: 10px; color: var(--ink);
}
.wiz-opt:hover { border-color: var(--accent); background: var(--accent-soft); }
.wiz-opt .d { display: block; color: var(--muted); font-size: 12.5px; margin-top: 2px; }
.modal-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 18px; }
.wiz-dots { display: flex; gap: 6px; }
.wiz-dots span { width: 8px; height: 8px; border-radius: 50%; background: var(--baseline); }
.wiz-dots span.done { background: var(--accent); }

/* ============================================================= responsive */
/* Prevent any element from forcing horizontal scroll on small screens.
   overflow-x lives on <html> only — putting it on <body> turns the body into a
   scroll container and breaks the sticky topbar. */
html { overflow-x: hidden; }
html, body { max-width: 100%; }
img, canvas, video { max-width: 100%; }

/* Tablets & large phones */
@media (max-width: 720px) {
  .topbar { padding: 12px 16px; gap: 12px; }
  .logo { font-size: 15px; }
  .view { padding: 18px 14px 64px; }
  .card { padding: 16px 14px; }
  .upload-hero { padding-top: 34px; }
  .upload-hero h1 { font-size: 24px; }
  .dropzone { padding: 36px 20px; }

  /* Source switcher becomes a horizontal scroller instead of overflowing */
  .src-toggle { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .src-toggle button { flex: 1 0 auto; white-space: nowrap; }
}

/* Phones */
@media (max-width: 560px) {
  body { font-size: 14px; }
  .topbar { padding: 10px 12px; gap: 8px; }
  #btn-new { padding: 6px 10px; font-size: 13px; }

  /* Analysis stat tiles: 4-across is too tight — go 2×2 */
  .stat-row { grid-template-columns: 1fr 1fr; }
  .stat .v { font-size: 18px; }

  /* Transport row wraps cleanly under the title */
  .transport { gap: 8px; }

  /* Slider label column shrinks so it doesn't crush the track */
  .slider-row { grid-template-columns: 90px 1fr 40px; gap: 8px; }

  /* Action button rows wrap instead of overflowing */
  .adv-actions, .enh-modes, .export-row { flex-wrap: wrap; }
  .adv-actions { justify-content: stretch; }
  .adv-actions button { flex: 1 1 auto; }

  /* Selection & preview bars stay tappable */
  .sel-bar, .preview-bar { gap: 8px; }
  .sel-bar select { flex: 0 0 auto; }

  /* Bigger, easier tap targets */
  .play-btn { width: 46px; height: 46px; }
  .stem-links a, .dl-link { padding: 5px 11px; }
}

/* Very small phones */
@media (max-width: 380px) {
  .stat-row { grid-template-columns: 1fr 1fr; gap: 8px; }
  .slider-row { grid-template-columns: 78px 1fr 36px; }
  .upload-hero h1 { font-size: 21px; }
}