:root {
  --bg: #fbfbfa;
  --panel: #ffffff;
  --panel-2: #f4f4f2;
  --line: #e4e3df;
  --line-strong: #d3d2cc;
  --ink: #1c1c1a;
  --ink-dim: #6b6b64;
  --ink-faint: #9d9c95;
  --accent: #0F766E;
  --accent-soft: #f0fdfa;
  --teal: #0ea88e;
  --teal-soft: #e3f7f2;
  --red: #dc2626;
  --radius: 12px;
  --disp: 'Space Grotesk', sans-serif;
  --body: 'IBM Plex Sans', sans-serif;
  --mono: 'IBM Plex Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--ink); font-family: var(--body); }
::selection { background: var(--accent-soft); color: var(--accent); }

.wrap { max-width: 980px; margin: 0 auto; }
.top-actions { display: flex; justify-content: flex-end; margin-bottom: 14px; }

.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px 26px;
  margin-bottom: 20px; box-shadow: 0 1px 4px rgba(0,0,0,.04);
}
.card h2 { font-family: var(--disp); font-size: 15px; font-weight: 600; color: var(--ink); margin-bottom: 16px; }

.meta-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 600px) { .meta-grid { grid-template-columns: repeat(2, 1fr); } }
.meta-item .label { font-family: var(--mono); font-size: 10px; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 4px; }
.meta-item .value { font-family: var(--mono); font-size: 13px; font-weight: 600; color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.settings-row { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
@media (max-width: 720px) { .settings-row { grid-template-columns: 1fr; } }

/* waveform */
.wave-label { font-family: var(--mono); font-size: 10px; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.dc-hint-badge { font-family: var(--mono); font-size: 9px; font-weight: 700; padding: 2px 7px; border-radius: 4px; background: #fef3c7; color: #d97706; border: 1px solid #fde68a; }
.wave-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-2); margin-bottom: 4px; position: relative; }
.wave-canvas { display: block; width: 100%; min-width: 280px; }
.after-loading { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-family: var(--mono); font-size: 11px; color: var(--ink-faint); background: rgba(244,244,242,.8); border-radius: 8px; }

/* DC stats box */
.dc-stats-box { background: var(--panel-2); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; margin-top: 10px; margin-bottom: 4px; }
.dc-stats-title { font-family: var(--mono); font-size: 9.5px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 10px; }
.dc-stat-row { display: grid; grid-template-columns: 20px 1fr auto 16px auto; align-items: center; gap: 8px; margin-bottom: 10px; }
.dc-stat-row:last-child { margin-bottom: 0; }
.dc-ch-name { font-family: var(--mono); font-size: 11px; font-weight: 700; color: var(--ink-faint); }
.dc-offset-bar { position: relative; height: 8px; background: var(--panel); border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
.dc-bar-center { position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background: var(--line-strong); }
.dc-bar-fill-pos { position: absolute; left: 50%; top: 0; bottom: 0; background: var(--accent); border-radius: 0 4px 4px 0; }
.dc-bar-fill-neg { position: absolute; right: 50%; top: 0; bottom: 0; background: var(--red); border-radius: 4px 0 0 4px; }
.dc-val-before { font-family: var(--mono); font-size: 10px; color: var(--ink-dim); white-space: nowrap; }
.dc-arrow { font-family: var(--mono); font-size: 10px; color: var(--ink-faint); }
.dc-val-after { font-family: var(--mono); font-size: 10px; font-weight: 700; white-space: nowrap; }
.dc-val-after.good { color: #059669; }
.dc-val-after.warn { color: #d97706; }
.dc-val-after.bad  { color: var(--red); }

/* preview */
.preview-row { display: flex; gap: 8px; }
.half-btn { flex: 1; }

/* mode buttons */
.mode-btns { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 0; }
.mode-btn { font-family: var(--mono); font-size: 11px; font-weight: 600; padding: 6px 12px; border-radius: 6px; border: 1px solid var(--line-strong); background: var(--panel-2); color: var(--ink-dim); cursor: pointer; transition: all .1s; }
.mode-btn:hover { border-color: var(--accent); color: var(--accent); }
.mode-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* mode panel hint */
.mode-hint-box { font-family: var(--body); font-size: 12px; line-height: 1.6; color: var(--ink-dim); background: var(--accent-soft); border: 1px solid #99f6e4; border-radius: 7px; padding: 9px 12px; margin-bottom: 16px; }

/* manual controls */
.ctrl { margin-bottom: 16px; }
.ctrl label { font-family: var(--mono); font-size: 10.5px; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-faint); display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; }
.ctrl .val { font-size: 13px; font-weight: 700; color: var(--accent); letter-spacing: 0; text-transform: none; }
.freq-hint { font-family: var(--mono); font-size: 9.5px; color: var(--ink-faint); margin-top: 4px; }
.ctrl input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 4px; background: var(--line-strong); border-radius: 2px; outline: none; cursor: pointer; }
.ctrl input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%; background: #fff; border: 2px solid var(--accent); box-shadow: 0 1px 4px rgba(15,118,110,.25); cursor: pointer; transition: transform .1s; }
.ctrl input[type=range]::-webkit-slider-thumb:hover { transform: scale(1.15); }
.ctrl input[type=range]::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: #fff; border: 2px solid var(--accent); cursor: pointer; }

.manual-row { display: flex; gap: 8px; align-items: center; margin-bottom: 16px; }
.manual-number-input { font-family: var(--mono); font-size: 12px; padding: 7px 10px; border: 1px solid var(--line-strong); border-radius: 6px; background: var(--panel-2); color: var(--ink); outline: none; width: 100px; transition: border-color .1s; }
.manual-number-input:focus { border-color: var(--accent); }
.use-det-btn { font-family: var(--mono); font-size: 11px; font-weight: 600; padding: 7px 12px; border-radius: 6px; border: 1px solid var(--accent); background: transparent; color: var(--accent); cursor: pointer; transition: background .1s; white-space: nowrap; }
.use-det-btn:hover:not(:disabled) { background: var(--accent-soft); }
.use-det-btn:disabled { opacity: .4; cursor: not-allowed; }

.out-select { font-family: var(--mono); font-size: 12.5px; width: 100%; padding: 10px 12px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--panel-2); color: var(--ink); cursor: pointer; outline: none; transition: border-color .1s; }
.out-select:focus { border-color: var(--accent); }
.out-format { margin-bottom: 18px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-family: var(--mono); font-size: 13px; font-weight: 700; padding: 12px 20px; border-radius: 8px; border: none; background: var(--accent); color: #fff; cursor: pointer; width: 100%; margin-bottom: 12px; transition: filter .12s, opacity .12s; }
.btn:hover:not(:disabled) { filter: brightness(1.08); }
.btn:disabled { opacity: .38; cursor: not-allowed; }
.btn.ghost { background: transparent; border: 1px solid var(--line-strong); color: var(--ink-dim); margin-bottom: 0; }
.btn.ghost:hover:not(:disabled) { filter: none; border-color: var(--accent); color: var(--accent); }
.btn.download-result { background: var(--teal); width: auto; padding: 10px 18px; margin-bottom: 0; }

.bar { height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; margin-bottom: 8px; }
.bar i { display: block; height: 100%; width: 0%; background: linear-gradient(90deg, var(--teal), var(--accent)); border-radius: 2px; transition: width .15s ease; }
.status-line { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); min-height: 16px; }

.result-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 10px; }
.result-heading h2 { margin-bottom: 4px; }
.status-pill { display: inline-flex; align-items: center; gap: 6px; font-family: var(--mono); font-size: 10.5px; font-weight: 700; letter-spacing: .5px; text-transform: uppercase; color: var(--teal); }
.pip { width: 7px; height: 7px; border-radius: 50%; background: var(--teal); display: inline-block; }
.result-body { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
@media (max-width: 700px) { .result-body { grid-template-columns: 1fr; } }
.result-side { display: flex; flex-direction: column; gap: 16px; }
.file-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 14px; background: var(--panel-2); border-radius: 8px; border: 1px solid var(--line); }
.file-pair .label { font-family: var(--mono); font-size: 10px; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 4px; }
.file-pair .fname { font-family: var(--mono); font-size: 12px; color: var(--ink); word-break: break-all; }
.result-stats { display: flex; flex-direction: column; }
.stat-row { display: flex; justify-content: space-between; align-items: center; font-family: var(--mono); font-size: 11.5px; padding: 7px 0; border-bottom: 1px solid var(--line); }
.stat-label { color: var(--ink-faint); }
.stat-value { color: var(--ink); font-weight: 600; }
.stat-value.accent { color: var(--accent); }
.result-info-box { font-family: var(--body); font-size: 12.5px; line-height: 1.6; color: var(--ink-dim); background: var(--accent-soft); border-radius: 8px; padding: 10px 14px; }