/* ============================================================
   Drone Meditations — web edition
   Dark, calm, glassy. Matches the iOS native design.
   ============================================================ */

:root {
  --bg: #050505;
  --panel: rgba(20, 20, 22, 0.55);
  --panel-strong: rgba(20, 20, 22, 0.80);
  --panel-border: rgba(255, 255, 255, 0.08);
  --text: #f3f3f3;
  --muted: rgba(243, 243, 243, 0.62);
  --dim: rgba(243, 243, 243, 0.38);
  --accent: #8fb9d9;
  --solo: #f7c948;
  --mute: #e0524a;
  --slider-track: rgba(255, 255, 255, 0.10);
  --slider-fill: rgba(255, 255, 255, 0.85);

  --radius: 14px;
  --radius-small: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", Segoe UI, Roboto, sans-serif;
  overflow: hidden;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 24px; background: transparent; }
input[type="range"]::-webkit-slider-runnable-track {
  height: 4px; border-radius: 2px;
  background: linear-gradient(to right, var(--slider-fill) var(--fill, 50%), var(--slider-track) var(--fill, 50%));
}
input[type="range"]::-moz-range-track { height: 4px; border-radius: 2px; background: var(--slider-track); }
input[type="range"]::-moz-range-progress { height: 4px; border-radius: 2px; background: var(--slider-fill); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: #fff; border: 0; margin-top: -7px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.45);
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: #fff; border: 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.45);
}

/* Canvas layers — full bleed, behind UI. */
#bg-canvas, #chladni-canvas {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
#chladni-canvas { mix-blend-mode: plus-lighter; opacity: 0.55; }
#tap-layer {
  position: fixed; inset: 0;
  background: transparent;
  z-index: 5;
}

/* Controls panel — glass, scrollable on small screens. */
.controls {
  position: fixed; inset: 0;
  display: flex; flex-direction: column;
  z-index: 10;
  padding: 16px clamp(12px, 3vw, 24px);
  padding-top: calc(env(safe-area-inset-top, 0px) + 12px);
  padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 12px);
  background: linear-gradient(180deg, rgba(0,0,0,0.45) 0%, rgba(0,0,0,0.18) 35%, rgba(0,0,0,0.18) 65%, rgba(0,0,0,0.5) 100%);
  transition: opacity 200ms ease, transform 220ms ease;
}
.controls.hidden { opacity: 0; pointer-events: none; transform: translateY(8px); }

.header {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 8px;
  margin-bottom: 10px;
}
.title-block h1 {
  margin: 0;
  font-size: 22px; font-weight: 600;
  letter-spacing: -0.01em;
}
.header-subtitle {
  margin: 2px 0 0 0;
  font-size: 12px;
  color: var(--muted);
}
.icon-button {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.10);
  color: var(--text);
  display: inline-flex; align-items: center; justify-content: center;
}
.icon-button.active {
  background: rgba(255, 255, 255, 0.85);
  color: #000;
}

.pill-row {
  display: flex; gap: 8px; margin-bottom: 12px;
  flex-wrap: wrap;
}
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255, 255, 255, 0.10);
  border-radius: 999px;
  padding: 6px 14px 6px 12px;
  color: var(--text);
}
.pill-label {
  font-size: 9px; font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.pill-value {
  font-size: 13px; font-weight: 600;
}

/* Oscillator strips — scroll-area between header and transport. */
.strips {
  flex: 1 1 auto;
  overflow-y: auto;
  display: flex; flex-direction: column; gap: 10px;
  padding-right: 2px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.20) transparent;
}
.strips::-webkit-scrollbar { width: 6px; }
.strips::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.20); border-radius: 3px; }

.strip {
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 10px 14px;
  display: flex; flex-direction: column; gap: 8px;
  transition: opacity 150ms ease;
}
.strip.silenced { opacity: 0.55; }
.strip-header { display: flex; align-items: center; gap: 10px; }
.strip-label {
  font-size: 11px; font-weight: 800; color: var(--muted);
  letter-spacing: 0.05em; width: 48px;
}
.strip-freq {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 17px; font-weight: 600;
  min-width: 100px;
}
.strip-freq-input {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 17px; font-weight: 600;
  color: var(--text);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 1px 6px;
  width: 86px;
  text-align: left;
  cursor: text;
  -webkit-user-select: text;
  user-select: text;
  outline: none;
  transition: background 100ms ease, border-color 100ms ease;
}
.strip-freq-input:hover { background: rgba(255,255,255,0.05); }
.strip-freq-input:focus {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.20);
}
.strip-freq-unit {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--muted);
  margin-left: -2px;
}
.strip-buttons { margin-left: auto; display: flex; gap: 6px; }

.sm-button {
  width: 26px; height: 26px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.10);
  font-size: 11px; font-weight: 800;
}
.sm-button.solo-on { background: var(--solo); color: #111; }
.sm-button.mute-on { background: var(--mute); color: #fff; }

.strip-controls {
  display: grid; grid-template-columns: minmax(150px, 200px) 1fr 1fr;
  gap: 12px; align-items: end;
}
.waveform-group {
  display: inline-flex;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 8px; padding: 2px;
  gap: 0;
}
.waveform-group button {
  flex: 1;
  padding: 6px 10px;
  border-radius: 6px;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--muted);
  transition: background 100ms ease, color 100ms ease;
}
.waveform-group button.selected {
  background: rgba(255, 255, 255, 0.85);
  color: #000;
}
.waveform-group button svg { width: 16px; height: 16px; }

.small-control { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.small-control-label {
  font-size: 9px; font-weight: 700;
  color: var(--muted); letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}

/* Master volume row. */
.master-row {
  margin-top: 10px;
  display: flex; align-items: center; gap: 10px;
  padding: 8px 14px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.master-row svg { color: var(--muted); flex-shrink: 0; }
.master-readout {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 11px; color: var(--muted);
  min-width: 28px; text-align: right;
}

/* Transport bar at the bottom. */
.transport {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex; flex-direction: column; gap: 10px;
}
.transport-buttons { display: flex; align-items: center; justify-content: center; gap: 16px; }
.transport-primary {
  width: 64px; height: 64px; border-radius: 50%;
  background: #fff; color: #000;
  display: inline-flex; align-items: center; justify-content: center;
}
.transport-secondary {
  width: 52px; height: 52px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
}
.transport-secondary:disabled { opacity: 0.4; cursor: default; }
.transport-meta {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.time-readout {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 15px;
}
.duration-button {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  font-size: 13px; font-weight: 500;
}
.duration-button .chev { font-size: 10px; opacity: 0.7; margin-left: 2px; }

.tap-hint {
  margin: 8px 0 0 0;
  text-align: center;
  font-size: 11px;
  color: var(--dim);
}
.tap-hint-sep { margin: 0 6px; opacity: 0.5; }
.tap-hint-action {
  background: none; border: 0; padding: 0;
  color: var(--accent);
  font: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.tap-hint-action:hover { color: #fff; }
.hidden-hint {
  position: fixed; left: 0; right: 0; bottom: calc(env(safe-area-inset-bottom, 0px) + 24px);
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,0.45);
  z-index: 6;
  pointer-events: none;
  opacity: 0;
  transition: opacity 200ms ease;
}
.controls.hidden + .hidden-hint { opacity: 1; }

/* Modal sheets. */
.sheet {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 20;
  display: flex; align-items: flex-end;
}
.sheet[hidden] { display: none; }
.sheet-panel {
  background: #0a0a0c;
  width: 100%; max-width: 720px;
  margin: 0 auto;
  border-radius: 18px 18px 0 0;
  max-height: 88vh;
  display: flex; flex-direction: column;
  border: 1px solid rgba(255,255,255,0.08);
}
.sheet-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.sheet-header h2 { margin: 0; font-size: 16px; font-weight: 600; }
.sheet-done {
  font-size: 14px; color: var(--accent); font-weight: 600;
}
.sheet-header-actions {
  display: flex; gap: 14px; align-items: center;
}
.sheet-save {
  font-size: 13px; font-weight: 600;
  color: var(--text);
  background: rgba(255,255,255,0.10);
  padding: 5px 12px; border-radius: 7px;
}
.sheet-save:hover { background: rgba(255,255,255,0.18); }

.user-preset-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
  align-items: stretch;
}
.user-preset-row.selected .preset-item { background: rgba(255,255,255,0.15); }
.user-preset-delete {
  align-self: stretch;
  padding: 0 12px;
  background: rgba(224, 82, 74, 0.10);
  color: #f3a8a3;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
}
.user-preset-delete:hover { background: rgba(224, 82, 74, 0.25); }
.sheet-scroll {
  overflow-y: auto;
  padding: 14px 18px 22px 18px;
  display: flex; flex-direction: column; gap: 18px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.18) transparent;
}
.sheet-section h3 {
  margin: 0 0 8px 0;
  font-size: 11px; font-weight: 800;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.preset-disclaimer {
  margin: 0;
  padding: 10px 12px;
  background: rgba(255,255,255,0.05);
  border-radius: 10px;
  font-size: 12px;
  color: var(--muted);
}

.key-grid {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px;
}
.key-grid button {
  padding: 9px 0;
  border-radius: 8px;
  background: rgba(255,255,255,0.07);
  color: var(--text);
  font-weight: 600;
  font-size: 13px;
}
.key-grid button.selected {
  background: rgba(255,255,255,0.88);
  color: #000;
}

.octave-row {
  display: grid; grid-template-columns: 56px 1fr 56px; gap: 10px; align-items: center;
}
.step-button {
  height: 40px; border-radius: 8px;
  background: rgba(255,255,255,0.08);
  font-size: 18px; font-weight: 600;
}
.octave-readout {
  text-align: center;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 18px; font-weight: 600;
}

.two-col-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
}
.two-col-grid button {
  padding: 10px 8px;
  border-radius: 8px;
  background: rgba(255,255,255,0.07);
  font-size: 12px; font-weight: 500;
  color: var(--text);
  text-align: center;
}
.two-col-grid button.selected {
  background: rgba(255,255,255,0.88);
  color: #000;
}

.chord-list { display: flex; flex-direction: column; gap: 12px; }
.chord-category h4 {
  margin: 0 0 6px 0;
  font-size: 11px; font-weight: 700; color: var(--dim);
  letter-spacing: 0.04em;
}
.chord-category .grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
}
.chord-category .grid button {
  padding: 10px 8px;
  border-radius: 8px;
  background: rgba(255,255,255,0.07);
  font-size: 12px; font-weight: 500;
  text-align: center;
}
.chord-category .grid button.selected {
  background: rgba(255,255,255,0.88);
  color: #000;
}

.preset-list { display: flex; flex-direction: column; gap: 18px; }
.preset-category h4 {
  margin: 0 0 6px 0;
  font-size: 11px; font-weight: 700; color: var(--dim);
  letter-spacing: 0.04em;
}
.preset-category > div { display: flex; flex-direction: column; gap: 6px; }
.preset-item {
  text-align: left;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(255,255,255,0.05);
  display: flex; flex-direction: column; gap: 3px;
}
.preset-item.selected { background: rgba(255,255,255,0.15); }
.preset-item .name { font-size: 14px; font-weight: 500; color: var(--text); }
.preset-item .sub { font-size: 11px; color: var(--muted); }

/* Sample row — visible only when the strip's waveform is "sample". */
.sample-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 6px;
  margin-top: 2px;
  border-top: 1px dashed rgba(255, 255, 255, 0.06);
  font-size: 12px;
}
.sample-row .strip-label { width: 56px; }
.sample-button, .sample-clear {
  padding: 5px 12px;
  border-radius: 7px;
  font-size: 12px; font-weight: 600;
  background: rgba(255, 255, 255, 0.10);
  color: var(--text);
  transition: background 100ms ease;
}
.sample-button:hover, .sample-clear:hover { background: rgba(255, 255, 255, 0.18); }
.sample-clear {
  background: rgba(224, 82, 74, 0.15);
  color: #f3a8a3;
}
.sample-clear:hover { background: rgba(224, 82, 74, 0.30); }
.sample-name {
  flex: 1;
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

/* Filter row */
.filter-row {
  display: grid;
  grid-template-columns: 36px auto 1fr 1fr;
  gap: 10px;
  align-items: center;
  padding-top: 6px;
  margin-top: 2px;
  border-top: 1px dashed rgba(255, 255, 255, 0.06);
}

/* Segmented control (filter type, LFO shape, LFO target). */
.seg {
  display: inline-flex;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 7px;
  padding: 2px;
  gap: 0;
}
.seg button {
  flex: 1;
  padding: 5px 10px;
  border-radius: 5px;
  font-size: 11px; font-weight: 600;
  color: var(--muted);
  transition: background 100ms ease, color 100ms ease;
  display: inline-flex; align-items: center; justify-content: center;
}
.seg button.selected {
  background: rgba(255, 255, 255, 0.85);
  color: #000;
}
.seg-tight button { padding: 3px 7px; font-size: 10px; }
.seg-tight button svg { display: block; }

/* FX rows (REV + DLY) — compact horizontal layout. */
.fx-row {
  display: grid;
  grid-template-columns: 36px 1fr 1fr;
  gap: 10px;
  align-items: center;
  padding-top: 6px;
  margin-top: 2px;
  border-top: 1px dashed rgba(255, 255, 255, 0.06);
  opacity: 0.7;
  transition: opacity 120ms ease;
}
.fx-row.active { opacity: 1; }
.fx-row[data-role="dly-row"] { grid-template-columns: 36px 1fr 1fr 1fr; }

/* LFO rows — 3 stacked compact LFO sections per strip. */
.lfo-rows {
  display: flex; flex-direction: column;
  gap: 4px;
  padding-top: 4px;
  margin-top: 2px;
  border-top: 1px dashed rgba(255, 255, 255, 0.06);
}
.lfo-control {
  display: grid;
  grid-template-columns: 44px auto auto 1fr 1fr;
  gap: 8px;
  align-items: center;
  opacity: 0.55;
  transition: opacity 120ms ease;
}
.lfo-control.active { opacity: 1; }
.lfo-label {
  font-size: 9px; font-weight: 800; letter-spacing: 0.05em;
  color: var(--muted);
}
.lfo-control.active .lfo-label { color: var(--accent); }
.mini-control { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.mini-label {
  font-size: 8px; font-weight: 700;
  color: var(--muted); letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}
.mini-control input[type="range"] { height: 18px; }
.mini-control input[type="range"]::-webkit-slider-thumb {
  width: 12px; height: 12px; margin-top: -4px;
}
.mini-control input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px;
}

/* Narrow screen tweaks: stack the strip controls vertically. */
@media (max-width: 540px) {
  .strip-controls { grid-template-columns: 1fr; }
  .waveform-group { width: 100%; }
  .filter-row { grid-template-columns: 36px auto 1fr; row-gap: 6px; }
  .filter-row .mini-control:last-child { grid-column: 1 / -1; }
  .lfo-control {
    grid-template-columns: 44px auto auto;
    row-gap: 4px;
  }
  .lfo-control .mini-control { grid-column: span 3; }
}