:root {
  --bg: #0a0e17;
  --panel: #101625;
  --panel2: #151d30;
  --border: #243052;
  --text: #e7ecf6;
  --muted: #8b96ad;
  --accent: #6366f1;
  --accent2: #22d3ee;
  --ok: #34d399;
  --warn: #fbbf24;
  --err: #f87171;
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(99, 102, 241, 0.10), transparent 60%),
    radial-gradient(900px 400px at 10% 110%, rgba(34, 211, 238, 0.07), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  min-height: 100vh;
}

.mono { font-family: ui-monospace, "JetBrains Mono", Consolas, monospace; font-variant-numeric: tabular-nums; }
.hidden { display: none !important; }
.dim { color: var(--muted); }
.small { font-size: 12px; }

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 50;
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand .logo { width: 34px; height: 34px; }
.brand h1 { margin: 0; font-size: 17px; letter-spacing: 0.5px; }
.brand .sub { color: var(--muted); font-size: 12px; }

.top-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.divider { width: 1px; height: 26px; background: var(--border); margin: 0 6px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  background: var(--panel2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 9px;
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.05s;
  white-space: nowrap;
  user-select: none;
}
.btn:hover { border-color: var(--accent); background: #1a2440; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: linear-gradient(135deg, #6366f1, #8b5cf6); border-color: transparent; }
.btn.primary:hover { background: linear-gradient(135deg, #7475f2, #9a6ef0); }
.btn.ghost { background: transparent; }
.btn.toggled { background: rgba(99, 102, 241, 0.22); border-color: var(--accent); }
.btn.tiny { padding: 4px 10px; font-size: 12px; border-radius: 7px; }
.btn.wide { width: 100%; margin-top: 6px; }
.btn.icon { width: 38px; height: 38px; padding: 0; }
.btn:disabled { opacity: 0.35; pointer-events: none; }
.btn .ic { width: 20px; height: 20px; }

.select {
  background: var(--panel2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 8px 12px;
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
}
.select:hover { border-color: var(--accent); }

.chk { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); cursor: pointer; }
.chk input { accent-color: var(--accent); }

/* ---------- layout ---------- */
.wrap { max-width: 1200px; margin: 0 auto; padding: 20px 22px 40px; display: flex; flex-direction: column; gap: 18px; }

.card {
  background: linear-gradient(180deg, rgba(21, 29, 48, 0.6), rgba(16, 22, 37, 0.6));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.card-title { margin: 0 0 12px; font-size: 13px; font-weight: 600; color: var(--muted); letter-spacing: 2px; text-transform: uppercase; display: flex; align-items: center; gap: 8px; }
.chip { font-size: 10px; padding: 2px 8px; border-radius: 99px; background: rgba(34, 211, 238, 0.12); color: var(--accent2); border: 1px solid rgba(34, 211, 238, 0.25); letter-spacing: 1px; }
.hint { color: var(--muted); font-size: 12px; line-height: 1.6; margin: 10px 0 0; }

.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }

.btn-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

/* ---------- transport ---------- */
.transport { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.transport .spacer { flex: 1; }
.time { font-size: 15px; padding: 0 8px; }
.time .dim { font-size: 12px; }

/* ---------- wave views ---------- */
.wave-views { position: relative; display: flex; flex-direction: column; gap: 10px; }
#timeline { padding: 0 4px; }
#waveform { border-radius: 10px; overflow: hidden; }
#minimap { border: 1px solid var(--border); border-radius: 8px; padding: 4px 2px; }
#spectrogram { height: 220px; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
#spectrogram canvas { width: 100% !important; height: 100% !important; }

.empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  min-height: 300px;
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  background: rgba(10, 14, 23, 0.6);
}
.empty-inner { text-align: center; }
.empty-ic { width: 56px; height: 56px; color: var(--muted); opacity: 0.6; }
.empty-actions { display: flex; gap: 10px; justify-content: center; margin: 12px 0; }

/* ---------- selection bar ---------- */
.sel-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
  padding: 9px 12px;
  background: rgba(99, 102, 241, 0.07);
  border: 1px solid rgba(99, 102, 241, 0.18);
  border-radius: 9px;
  font-size: 13px;
  flex-wrap: wrap;
}
.sel-actions { display: flex; gap: 6px; }

/* ---------- sliders ---------- */
.slider-row { display: grid; grid-template-columns: 56px 1fr 74px; align-items: center; gap: 10px; margin: 10px 0; font-size: 13px; }
.slider-row input[type="range"] { width: 100%; accent-color: var(--accent); }
.slider-row .val { text-align: right; font-size: 12px; color: var(--accent2); }

/* ---------- export ---------- */
.export-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.export-row .btn { margin-left: auto; }

/* ---------- footer ---------- */
.foot { text-align: center; color: var(--muted); font-size: 12px; line-height: 2; }

/* ---------- modal ---------- */
.modal-back {
  position: fixed;
  inset: 0;
  background: rgba(3, 6, 14, 0.72);
  backdrop-filter: blur(5px);
  display: grid;
  place-items: center;
  z-index: 998;
}
.modal-back[hidden] { display: none !important; }
.modal {
  width: min(560px, 92vw);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
}
.modal h3 { margin: 0 0 14px; font-size: 16px; }
#recWave { border: 1px solid var(--border); border-radius: 9px; padding: 4px; background: #0a0f1c; }
.rec-row { display: flex; align-items: center; gap: 8px; margin: 12px 0; font-size: 14px; }
.rec-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--err); animation: pulse 1.1s infinite; }
.rec-row[data-idle] .rec-dot { background: var(--muted); animation: none; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }
.modal-actions { display: flex; gap: 8px; }

/* ---------- drop overlay ---------- */
#dropOverlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(99, 102, 241, 0.14);
  border: 3px dashed var(--accent);
  display: none;
  place-items: center;
  font-size: 20px;
  font-weight: 600;
  pointer-events: none;
}
#dropOverlay.on { display: grid; }

/* ---------- toasts ---------- */
#toasts { position: fixed; top: 18px; right: 18px; z-index: 1000; display: flex; flex-direction: column; gap: 8px; max-width: 360px; }
.toast {
  background: rgba(15, 22, 38, 0.96);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 10px 14px;
  border-radius: 9px;
  font-size: 13px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  animation: slidein 0.22s ease-out;
}
.toast.ok { border-left-color: var(--ok); }
.toast.warn { border-left-color: var(--warn); }
.toast.err { border-left-color: var(--err); }
.toast.gone { opacity: 0; transform: translateX(12px); transition: 0.3s; }
@keyframes slidein { from { opacity: 0; transform: translateX(16px); } to { opacity: 1; transform: none; } }

/* ---------- wavesurfer canvas tweaks ---------- */
#waveform > div { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
#waveform canvas { display: block; }

div[part="region-handle region-handle-left"] {
  border-left: 2px solid #818cf8 !important;
  background: rgba(129, 140, 248, 0.25);
}
div[part="region-handle region-handle-right"] {
  border-right: 2px solid #818cf8 !important;
  background: rgba(129, 140, 248, 0.25);
}
#timeline canvas { display: block; }

/* ---------- selection bar extras ---------- */
.sel-bar { align-items: center; }
.sel-actions { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.tiny-chk { font-size: 12px; }
.num-input {
  width: 58px;
  background: var(--panel2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 3px 8px;
  font-family: ui-monospace, monospace;
  font-size: 12px;
}
.seg-tools { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); }
.bpm-badge {
  font-family: ui-monospace, monospace;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 99px;
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid rgba(34, 211, 238, 0.3);
  color: var(--accent2);
}

/* ---------- effects rack ---------- */
.modal-wide { width: min(640px, 94vw); }
.fx-rack { display: flex; flex-direction: column; gap: 8px; max-height: 55vh; overflow-y: auto; padding-right: 6px; }
.fx-row {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  background: rgba(21, 29, 48, 0.45);
  transition: border-color 0.15s, background 0.15s;
}
.fx-row.active { border-color: var(--accent); background: rgba(99, 102, 241, 0.08); }
.fx-head { display: flex; align-items: baseline; gap: 10px; cursor: pointer; user-select: none; }
.fx-head b { font-size: 14px; }
.fx-head input { accent-color: var(--accent); width: 16px; height: 16px; transform: translateY(2px); }
.fx-sub { color: var(--muted); font-size: 12px; }
.fx-params { margin-top: 8px; display: grid; gap: 4px; }
.fx-params .slider-row { grid-template-columns: 56px 1fr 76px; margin: 2px 0; }
.fx-params .slider-row:has(select) { grid-template-columns: 56px minmax(140px, 1fr) 76px; }

/* ---------- generator ---------- */
.radio-row { display: flex; gap: 14px; flex-wrap: wrap; margin: 12px 0 4px; font-size: 13px; }
.radio-row label { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; color: var(--muted); }
.radio-row input { accent-color: var(--accent); }

/* ---------- tag card ---------- */
.tag-grid { display: flex; gap: 18px; align-items: flex-start; flex-wrap: wrap; }
.tag-cover { display: flex; flex-direction: column; gap: 8px; align-items: center; width: 140px; }
.tag-cover img {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.cover-up { cursor: pointer; text-align: center; }
.tag-fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px; flex: 1; min-width: 240px; }
.tag-fields label { display: flex; flex-direction: column; gap: 5px; font-size: 12px; color: var(--muted); }
.tag-fields input {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 8px 10px;
  font-family: inherit;
  font-size: 13px;
}
.tag-fields input:focus { outline: none; border-color: var(--accent); }

@media (max-width: 720px) {
  .btn-grid { grid-template-columns: 1fr; }
  .export-row .btn { margin-left: 0; }
  .slider-row { grid-template-columns: 52px 1fr 64px; }
}