/* Harmonics Lab — dark, instrument-panel styling. */
:root {
  --bg: #0b0e14;
  --panel: #121722;
  --panel-2: #171d2a;
  --line: #222a3a;
  --line-2: #2c3649;
  --text: #e6ebf5;
  --text-2: #a5b0c4;
  --text-3: #6d7891;
  --accent: #5fd4ff;
  --ok: #5ee39a;
  --warn: #ffcc66;
  --bad: #ff5f6d;
  --v0: #5fd4ff;
  --v1: #ffb35c;
  --v2: #c792ff;
  --v3: #78e08f;
  --v4: #ff7aa8;
  --v5: #ffe066;
  --radius: 10px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Devanagari", sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 var(--sans);
  -webkit-font-smoothing: antialiased;
}
button, select, input { font: inherit; color: inherit; }
kbd {
  font: 11px var(--mono); padding: 1px 5px; border-radius: 4px;
  border: 1px solid var(--line-2); background: var(--panel-2); color: var(--text-2);
}
a { color: var(--accent); }
.muted { color: var(--text-3); margin: 6px 0; }
.hint { color: var(--text-3); font-size: 12px; margin: 6px 0 0; }
.ok { color: var(--ok); } .bad { color: var(--bad); }

/* ------------------------------------------------------------- Top bar */
.topbar {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  padding: 10px 16px; border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #10141d, #0d1118);
  position: sticky; top: 0; z-index: 20;
}
.brand { display: flex; align-items: center; gap: 10px; margin-right: auto; }
.brand img { width: 30px; height: 30px; display: block; }
.brand h1 { font-size: 17px; margin: 0; letter-spacing: .2px; }
.brand .tag { font-size: 11px; color: var(--text-3); letter-spacing: .6px; text-transform: uppercase; }

.sources { display: flex; gap: 6px; flex-wrap: wrap; }
.src-btn {
  display: inline-flex; align-items: center; gap: 7px; cursor: pointer;
  padding: 7px 12px; border-radius: 8px; border: 1px solid var(--line-2);
  background: var(--panel); color: var(--text-2); transition: .15s;
  user-select: none;
}
.src-btn svg { width: 17px; height: 17px; }
.src-btn:hover { color: var(--text); border-color: #3a4660; }
.src-btn[aria-pressed="true"] {
  color: #001a24; background: var(--accent); border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(95, 212, 255, .15);
}
#btnMic[aria-pressed="true"] { animation: live 2s ease-in-out infinite; }
@keyframes live { 50% { box-shadow: 0 0 0 6px rgba(95, 212, 255, .08); } }
#btnFreeze[aria-pressed="true"] { background: var(--warn); border-color: var(--warn); color: #241a00; }

.tonal { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.tonal label { display: inline-flex; align-items: center; gap: 6px; color: var(--text-3); font-size: 12px; }
.tonal select, .tonal input[type=number] {
  background: var(--panel); border: 1px solid var(--line-2); border-radius: 7px;
  padding: 5px 7px; color: var(--text); font-size: 13px;
}
.tonal input[type=number] { width: 72px; }
.unit { color: var(--text-3); }
.check { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.check input { accent-color: var(--accent); }
.icon-btn {
  display: inline-grid; place-items: center; width: 32px; height: 32px; cursor: pointer;
  border-radius: 8px; border: 1px solid var(--line-2); background: var(--panel); color: var(--text-2);
}
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn:hover { color: var(--text); }

button.primary, button.ghost, .empty-actions button {
  padding: 8px 14px; border-radius: 8px; cursor: pointer; border: 1px solid var(--line-2);
  background: var(--panel-2); color: var(--text);
}
button.primary { background: var(--accent); border-color: var(--accent); color: #001a24; font-weight: 600; }
button.ghost { background: transparent; color: var(--text-2); }
button.ghost:hover { color: var(--text); }

/* -------------------------------------------------------------- Layout */
.layout {
  display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 12px;
  padding: 12px 16px 16px;
}
.stage { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.side { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.site-foot { margin: 0; padding: 0 4px; font-size: 12px; text-align: right; }
.site-foot a { color: var(--text-3); text-decoration: none; }
.site-foot a:hover { color: var(--text); }
.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 10px 12px 12px; min-width: 0;
}
.panel-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.panel h2 { font-size: 13px; margin: 0; font-weight: 600; letter-spacing: .3px; }
.panel h2 .sub { font-weight: 400; color: var(--text-3); margin-left: 6px; font-size: 12px; }
.legend { display: flex; gap: 10px; flex-wrap: wrap; font-size: 12px; color: var(--text-2); }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 5px; vertical-align: -1px; }

.canvas-wrap { position: relative; width: 100%; }
.canvas-wrap canvas { display: block; width: 100%; height: 100%; }
.spectrum-panel .canvas-wrap { height: clamp(300px, 46vh, 560px); cursor: crosshair; }
.canvas-wrap.short { height: 210px; }
.canvas-wrap.tall { height: clamp(320px, 42vh, 520px); }
.canvas-wrap.spark { height: 64px; }
.canvas-wrap.tuning-strip { height: 230px; }
.canvas-hint { margin: 6px 0 0; color: var(--text-3); font-size: 11.5px; }

.empty-state {
  position: absolute; inset: 0; display: grid; place-content: center; text-align: center;
  padding: 20px; color: var(--text-2); pointer-events: none;
}
.empty-state .big { font-size: 26px; color: var(--text); margin: 0 0 6px; font-weight: 600; }
.empty-state p { margin: 4px auto; max-width: 460px; }
.empty-actions { display: flex; gap: 8px; justify-content: center; margin-top: 14px; pointer-events: auto; }
.empty-state[hidden] { display: none; }

.tooltip {
  position: absolute; pointer-events: none; z-index: 5;
  background: rgba(10, 13, 20, .94); border: 1px solid var(--line-2); border-radius: 8px;
  padding: 7px 9px; font: 12px/1.45 var(--mono); color: var(--text); white-space: nowrap;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .4);
}
.tooltip b { color: var(--accent); font-weight: 600; }
.tooltip .dim { color: var(--text-3); }

/* ---------------------------------------------------------------- Tabs */
.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--line); margin: -2px -2px 10px; overflow-x: auto; }
.tabs button {
  background: none; border: 0; border-bottom: 2px solid transparent; padding: 8px 12px; cursor: pointer;
  color: var(--text-3); white-space: nowrap; font-size: 13px;
}
.tabs button:hover { color: var(--text-2); }
.tabs button[aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); }
.tab-toolbar { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 8px; font-size: 12px; color: var(--text-3); }
.tab-toolbar label { display: inline-flex; gap: 6px; align-items: center; }
.tab-toolbar select { background: var(--panel-2); border: 1px solid var(--line-2); border-radius: 6px; padding: 4px 6px; color: var(--text); }
.tab-explain { flex: 1 1 320px; }
.voice-pick { display: inline-flex; gap: 4px; }
.voice-pick button {
  border: 1px solid var(--line-2); background: var(--panel-2); border-radius: 6px; padding: 3px 9px; cursor: pointer;
  font-size: 12px; color: var(--text-2);
}
.voice-pick button[aria-pressed="true"] { color: #0b0e14; font-weight: 600; }

.ladder-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; }
.table-wrap { overflow: auto; max-height: 300px; border: 1px solid var(--line); border-radius: 8px; }
table.data { border-collapse: collapse; width: 100%; font-size: 12.5px; font-variant-numeric: tabular-nums; }
table.data th, table.data td { padding: 5px 9px; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.data th { position: sticky; top: 0; background: var(--panel-2); color: var(--text-3); font-weight: 500; text-align: right; z-index: 1; }
table.data td.l, table.data th.l { text-align: left; }
table.data tr:hover td { background: rgba(255, 255, 255, .025); }
table.data tr.absent td { color: var(--text-3); }
.cents-pos { color: #ffb35c; } .cents-neg { color: #5fd4ff; } .cents-zero { color: var(--ok); }
.tuning-table td.cell { cursor: pointer; }
.tuning-table td.cell:hover { outline: 1px solid var(--accent); outline-offset: -1px; }
.tuning-table td.active-col, .tuning-table th.active-col { background: rgba(95, 212, 255, .07); }
.tuning-about { color: var(--text-2); font-size: 12.5px; margin-top: 10px; display: grid; gap: 4px; }
.tuning-about b { color: var(--text); }

.guide-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.guide h3 { font-size: 14px; margin: 4px 0 6px; color: var(--accent); }
.guide p, .guide li { color: var(--text-2); font-size: 13px; }
.guide ul { padding-left: 18px; margin: 0; }
.guide li { margin-bottom: 5px; }
.guide .refs { color: var(--text-3); font-size: 12px; border-top: 1px solid var(--line); padding-top: 10px; margin-top: 14px; }

/* --------------------------------------------------------------- Side */
.note-cards { display: grid; gap: 8px; }
.note-card {
  display: grid; grid-template-columns: 6px 1fr auto; gap: 0 10px; align-items: center;
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 9px; padding: 8px 10px 8px 0; overflow: hidden;
}
.note-card .bar { grid-row: 1 / span 3; align-self: stretch; border-radius: 0 3px 3px 0; }
.note-card .name { font-size: 26px; font-weight: 650; line-height: 1.1; letter-spacing: -.3px; }
.note-card .name small { font-size: 14px; font-weight: 500; color: var(--text-2); margin-left: 3px; }
.note-card .svara { font-size: 22px; text-align: right; line-height: 1.1; }
.note-card .freq { font: 13px var(--mono); color: var(--text-2); }
.note-card .meta { grid-column: 2 / span 2; font-size: 11.5px; color: var(--text-3); display: flex; gap: 10px; flex-wrap: wrap; }
.cents-meter { grid-column: 2 / span 2; height: 18px; position: relative; margin: 4px 0 2px; }
.cents-meter .track { position: absolute; left: 0; right: 0; top: 8px; height: 2px; background: var(--line-2); border-radius: 2px; }
.cents-meter .tick { position: absolute; top: 4px; width: 1px; height: 10px; background: var(--text-3); }
.cents-meter .tick.mid { background: var(--ok); top: 2px; height: 14px; width: 2px; margin-left: -1px; }
.cents-meter .needle { position: absolute; top: 1px; width: 4px; height: 16px; border-radius: 2px; margin-left: -2px; transition: left .12s linear; }
.cents-meter .lbl { position: absolute; right: 0; top: -2px; font: 11px var(--mono); }

.interval-cards { display: grid; gap: 8px; }
.interval-card { background: var(--panel-2); border: 1px solid var(--line); border-radius: 9px; padding: 8px 10px; font-size: 12.5px; }
.interval-card .top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.interval-card .iname { font-weight: 600; font-size: 14px; }
.interval-card .pair { color: var(--text-3); font-size: 12px; }
.interval-card .nums { font: 12px var(--mono); color: var(--text-2); margin-top: 3px; }
.interval-card .beat { margin-top: 4px; font-size: 12px; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 3px; vertical-align: 0; }

.level { width: 70px; height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.level i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--ok), var(--warn) 75%, var(--bad)); transition: width .08s; }
.rough-val { font: 600 18px var(--mono); }

/* Sargam glyphs: komal = underline, tivra = mark above, saptak dots. */
.sv { position: relative; display: inline-block; padding: 0 1px; }
.sv.komal { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 3px; }
.sv.tivra::before { content: ""; position: absolute; left: 50%; top: -0.18em; height: .32em; border-left: 2px solid currentColor; }
.sv.mandra::after, .sv.taar::after {
  content: attr(data-dots); position: absolute; left: 0; right: 0; text-align: center;
  font-size: .55em; letter-spacing: .1em; line-height: 1;
}
.sv.mandra::after { bottom: -0.75em; }
.sv.taar::after { top: -0.6em; }
.sv.taar.tivra::after { top: -0.95em; }

/* -------------------------------------------------------------- Drawers */
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(380px, 100vw); z-index: 40;
  background: var(--panel); border-left: 1px solid var(--line-2); box-shadow: -10px 0 40px rgba(0, 0, 0, .5);
  display: flex; flex-direction: column;
}
.drawer[hidden] { display: none; }
.drawer-head { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.drawer-head h2 { margin: 0; font-size: 15px; }
.drawer-body { overflow-y: auto; padding: 8px 16px 20px; }
fieldset { border: 0; border-top: 1px solid var(--line); padding: 10px 0 6px; margin: 6px 0; display: grid; gap: 10px; }
legend { color: var(--accent); font-size: 12px; text-transform: uppercase; letter-spacing: .8px; padding-right: 8px; }
.drawer label { display: grid; gap: 4px; font-size: 12.5px; color: var(--text-2); }
.drawer label.check { display: flex; }
.drawer label output { float: right; color: var(--text); font-family: var(--mono); font-size: 12px; }
.drawer select, .drawer input[type=number] {
  background: var(--panel-2); border: 1px solid var(--line-2); border-radius: 7px; padding: 6px 8px; color: var(--text);
}
.drawer input[type=number] { width: 90px; }
.drawer input[type=range] { width: 100%; accent-color: var(--accent); }
.drawer .row { display: flex; align-items: center; gap: 6px; color: var(--text-3); }

/* ------------------------------------------------------------- Tone Lab */
.tonelab {
  position: sticky; bottom: 0; z-index: 30; margin: 0 16px 12px;
  background: rgba(18, 23, 34, .97); backdrop-filter: blur(6px);
  border: 1px solid var(--line-2); border-radius: 12px; padding: 10px 14px 12px;
  box-shadow: 0 -10px 40px rgba(0, 0, 0, .45);
}
.tonelab[hidden] { display: none; }
.tonelab-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; font-size: 12px; color: var(--text-3); }
.tonelab-head h2 { margin: 0 6px 0 0; font-size: 14px; color: var(--text); }
.tonelab-head label { display: inline-flex; align-items: center; gap: 6px; }
.tonelab-head select { background: var(--panel-2); border: 1px solid var(--line-2); border-radius: 6px; padding: 4px 6px; color: var(--text); }
.tonelab-head input[type=range] { width: 90px; accent-color: var(--accent); }
.tonelab-head output { font-family: var(--mono); color: var(--text); min-width: 2.2em; text-align: right; }
.tonelab-head #tlCollapse { margin-left: auto; }
.tonelab-presets { display: flex; gap: 6px; flex-wrap: wrap; margin: 8px 0; }
.tonelab.collapsed .tonelab-presets, .tonelab.collapsed .keyboard, .tonelab.collapsed .tl-hint, .tonelab.collapsed .tl-about { display: none; }
.tonelab-head label.off { opacity: .45; }
.tl-about { margin: 8px 0 0; font-size: 12px; line-height: 1.45; color: var(--text-3); max-width: 110ch; }
.tl-about b { color: var(--text-2, var(--text)); font-weight: 600; }
.tonelab-presets button {
  font-size: 12px; padding: 4px 9px; border-radius: 999px; cursor: pointer;
  background: var(--panel-2); border: 1px solid var(--line-2); color: var(--text-2);
}
.tonelab-presets button:hover { color: var(--text); border-color: var(--accent); }
.tonelab-presets button[aria-pressed="true"] { color: #001a24; background: var(--accent); border-color: var(--accent); }
.tl-hint { margin-top: 6px; font-size: 11.5px; }

.keyboard { position: relative; height: 104px; user-select: none; touch-action: manipulation; }
.key {
  position: absolute; top: 0; border: 1px solid #0b0e14; border-radius: 0 0 6px 6px; cursor: pointer;
  display: flex; flex-direction: column; justify-content: flex-end; align-items: center; padding-bottom: 6px;
  font-size: 11px; line-height: 1.25; transition: background .08s;
}
.key.white { height: 100%; background: linear-gradient(#e8ecf3, #cfd6e2); color: #2a3346; z-index: 1; }
.key.black { height: 60%; background: linear-gradient(#2a3242, #151a24); color: #b8c2d6; z-index: 2; border-color: #05070a; }
.key.on.white { background: linear-gradient(#bfefff, #5fd4ff); }
.key.on.black { background: linear-gradient(#3db8e6, #1a7fa6); color: #fff; }
.key .kc { font-family: var(--mono); font-size: 10px; opacity: .5; }
.key .kf { font-family: var(--mono); font-size: 9.5px; opacity: .65; }
.key.black .kf, .key.black .kc { display: none; }
.key .ks { font-size: 12px; font-weight: 600; }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 60;
  background: #1d2433; border: 1px solid var(--line-2); color: var(--text); border-radius: 10px;
  padding: 10px 14px; box-shadow: 0 10px 30px rgba(0, 0, 0, .5); max-width: min(560px, 92vw);
}
.toast.error { border-color: var(--bad); }

/* ---------------------------------------------------------- Responsive */
@media (max-width: 1100px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .side { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
  .site-foot { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .topbar { padding: 8px 16px; gap: 10px; }
  .layout { padding: 10px 16px; }
  .src-btn span { display: none; }
  .tonal { gap: 8px; }
  .brand .tag { display: none; }
  .tonelab { margin: 0 8px 8px; }
}