/* Frequency Therapy Generator — Dark Theme */
:root {
  --bg-dark: #0a0e1a;
  --bg-card: #111827;
  --bg-sidebar: #0d1220;
  --cyan: #00d2ff;
  --cyan-dim: rgba(0, 210, 255, 0.15);
  --cyan-glow: rgba(0, 210, 255, 0.4);
  --text: #e0e6f0;
  --text-dim: #8892a4;
  --green: #34d399;
  --yellow: #fbbf24;
  --orange: #f97316;
  --radius: 10px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 300px;
  background: var(--bg-sidebar);
  border-right: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.sidebar-header h1 {
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.5px;
}

.sidebar-header .subtitle {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 4px;
}

/* Category nav */
#category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.cat-btn {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 6px;
  color: var(--text-dim);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s;
}

.cat-btn:hover { border-color: var(--cyan); color: var(--text); }
.cat-btn.active { background: var(--cyan-dim); border-color: var(--cyan); color: var(--cyan); }
.cat-icon { font-size: 14px; }

/* Preset list */
#preset-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.preset-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-card:hover { border-color: var(--cyan); transform: translateX(3px); }
.preset-card.active { border-color: var(--cyan); background: var(--cyan-dim); }

.preset-name { font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.preset-desc { font-size: 12px; color: var(--text-dim); margin-bottom: 6px; line-height: 1.4; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.badge-clinical { background: rgba(52,211,153,0.15); color: var(--green); }
.badge-preliminary { background: rgba(251,191,36,0.15); color: var(--yellow); }
.badge-traditional { background: rgba(249,115,22,0.15); color: var(--orange); }

/* Main area */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 30px;
  gap: 24px;
  overflow-y: auto;
}

/* Headphone warning */
.headphone-warn {
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.3);
  border-radius: var(--radius);
  padding: 10px 16px;
  font-size: 13px;
  color: var(--yellow);
  width: 100%;
  max-width: 600px;
  text-align: center;
}

.hidden { display: none !important; }

/* Sub-audible note */
.sub-audible-note {
  background: rgba(0, 210, 255, 0.08);
  border: 1px solid rgba(0, 210, 255, 0.2);
  border-radius: var(--radius);
  padding: 8px 16px;
  font-size: 12px;
  color: var(--cyan);
  width: 100%;
  max-width: 600px;
  text-align: center;
}

/* Waveform canvas */
.canvas-wrap {
  width: 100%;
  max-width: 600px;
  height: 160px;
  background: rgba(0,0,0,0.3);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  overflow: hidden;
}

#waveform-canvas { width: 100%; height: 100%; display: block; }

/* Controls panel */
.controls {
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.control-label {
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  width: 80px;
  flex-shrink: 0;
}

/* Slider styling */
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 6px;
  background: rgba(255,255,255,0.1);
  border-radius: 3px;
  outline: none;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--cyan);
  cursor: pointer;
  box-shadow: 0 0 8px var(--cyan-glow);
}

input[type=range]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--cyan);
  cursor: pointer;
  border: none;
}

/* Number input */
input[type=number] {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  color: var(--text);
  padding: 6px 10px;
  width: 90px;
  font-size: 14px;
  text-align: center;
}

input[type=number]:focus { border-color: var(--cyan); outline: none; }

.freq-unit { font-size: 13px; color: var(--text-dim); }

/* Waveform buttons */
.wave-btns { display: flex; gap: 6px; flex: 1; }

.wave-btn {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  color: var(--text-dim);
  padding: 6px 14px;
  cursor: pointer;
  font-size: 12px;
  transition: all 0.2s;
  text-transform: capitalize;
}

.wave-btn:hover { border-color: var(--cyan); color: var(--text); }
.wave-btn.active { background: var(--cyan-dim); border-color: var(--cyan); color: var(--cyan); }

/* Volume */
#vol-value { font-size: 13px; color: var(--text-dim); width: 40px; text-align: right; }

/* Timer */
.timer-section {
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}

.timer-btns { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; }

.timer-btn {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  color: var(--text-dim);
  padding: 6px 14px;
  cursor: pointer;
  font-size: 12px;
  transition: all 0.2s;
}

.timer-btn:hover { border-color: var(--cyan); color: var(--text); }
.timer-btn.active { background: var(--cyan-dim); border-color: var(--cyan); color: var(--cyan); }

#timer-custom {
  width: 60px;
}

.timer-row { display: flex; align-items: center; gap: 8px; }

#timer-display {
  font-size: 28px;
  font-weight: 300;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* Play button */
.play-wrap {
  display: flex;
  justify-content: center;
  margin: 10px 0;
}

#play-btn {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0d1220, #162032);
  border: 3px solid var(--cyan);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: all 0.3s;
  box-shadow: 0 0 20px rgba(0, 210, 255, 0.15);
}

#play-btn:hover {
  box-shadow: 0 0 30px var(--cyan-glow);
  transform: scale(1.05);
}

#play-btn.playing {
  border-color: #ff4466;
  box-shadow: 0 0 30px rgba(255, 68, 102, 0.3);
  animation: pulse-glow 2s ease-in-out infinite;
}

#play-btn .play-icon {
  font-size: 28px;
  line-height: 1;
}

#play-btn .play-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(255, 68, 102, 0.2); }
  50% { box-shadow: 0 0 40px rgba(255, 68, 102, 0.5); }
}

/* Footer */
.disclaimer {
  width: 100%;
  max-width: 600px;
  padding: 16px;
  font-size: 11px;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.5;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: auto;
}

/* Responsive — Tablet */
@media (max-width: 900px) {
  .sidebar { width: 260px; }
  .main { padding: 24px 20px; }
}

/* Responsive — Mobile */
@media (max-width: 768px) {
  .app-layout {
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    max-height: none;
    flex-shrink: 0;
  }

  /* Collapsible sidebar — show header + nav, collapse presets */
  .sidebar-header { padding: 16px; }
  .sidebar-header h1 { font-size: 16px; }

  #category-nav {
    padding: 8px 12px;
    gap: 6px;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  .cat-btn {
    flex-shrink: 0;
    padding: 8px 12px;
    font-size: 13px;
  }

  .cat-icon { font-size: 16px; }

  #preset-list {
    max-height: 35vh;
    padding: 8px 12px;
    gap: 6px;
  }

  .preset-card {
    padding: 10px;
  }

  .preset-card:hover { transform: none; }

  .admin-panel {
    max-height: 50vh;
    padding: 12px;
  }

  /* Main area */
  .main {
    padding: 16px;
    gap: 16px;
    padding-bottom: 100px; /* space for floating play btn */
  }

  .canvas-wrap { height: 100px; }

  /* Controls */
  .controls { gap: 14px; }

  .control-row {
    flex-wrap: wrap;
    gap: 8px;
  }

  .control-label {
    width: 100%;
    margin-bottom: -4px;
  }

  /* Larger touch targets for sliders */
  input[type=range] {
    height: 8px;
  }

  input[type=range]::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
  }

  input[type=range]::-moz-range-thumb {
    width: 24px;
    height: 24px;
  }

  input[type=number] {
    padding: 8px 10px;
    font-size: 16px; /* prevents iOS zoom on focus */
    width: 80px;
  }

  /* Waveform buttons — fill width */
  .wave-btns {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
  }

  .wave-btn {
    padding: 10px 6px;
    font-size: 12px;
    text-align: center;
    justify-content: center;
  }

  /* Timer */
  .timer-section { gap: 8px; }

  .timer-btns {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
  }

  .timer-btn {
    padding: 10px 6px;
    font-size: 13px;
    text-align: center;
  }

  #timer-custom {
    width: 100%;
    grid-column: span 2;
  }

  #timer-display { font-size: 24px; }

  /* Floating play button */
  .play-wrap {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 100;
    margin: 0;
  }

  #play-btn {
    width: 64px;
    height: 64px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 210, 255, 0.15);
  }

  #play-btn .play-icon { font-size: 20px; }
  #play-btn .play-label { font-size: 8px; letter-spacing: 0.5px; }

  /* Warnings */
  .headphone-warn, .sub-audible-note {
    font-size: 12px;
    padding: 8px 12px;
  }

  /* Disclaimer */
  .disclaimer {
    padding: 12px;
    font-size: 10px;
    margin-bottom: 80px; /* space for floating btn */
  }

  /* User bar */
  .user-bar { margin-top: 8px; padding-top: 8px; }

  /* Admin panel on mobile */
  .user-row {
    padding: 8px 10px;
    flex-wrap: wrap;
    gap: 6px;
  }

  .add-user-form input, .add-user-form select {
    font-size: 16px; /* prevents iOS zoom */
    padding: 12px;
  }
}

/* Responsive — Small phones */
@media (max-width: 380px) {
  .sidebar-header { padding: 12px; }
  .sidebar-header h1 { font-size: 15px; }
  #category-nav { padding: 6px 8px; }
  .cat-btn { padding: 6px 8px; font-size: 12px; }
  .cat-label { display: none; }
  .cat-icon { font-size: 18px; }
  #preset-list { padding: 6px 8px; max-height: 30vh; }
  .main { padding: 12px; gap: 12px; }
  .canvas-wrap { height: 80px; }

  .wave-btns { grid-template-columns: repeat(2, 1fr); }
  .timer-btns { grid-template-columns: repeat(3, 1fr); }
  #timer-custom { grid-column: span 3; }
}

/* Safe area insets for notched phones */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .play-wrap {
    bottom: calc(24px + env(safe-area-inset-bottom));
    right: calc(24px + env(safe-area-inset-right));
  }
  .disclaimer {
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
  }
}

/* Landscape mobile */
@media (max-width: 768px) and (orientation: landscape) {
  .sidebar { max-height: 40vh; }
  #preset-list { max-height: 25vh; }
  .canvas-wrap { height: 80px; }
  .main { padding-bottom: 80px; }
}

/* User bar */
.user-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

#user-name {
  font-size: 13px;
  color: var(--text);
  flex: 1;
}

.small-btn {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  color: var(--text-dim);
  padding: 4px 10px;
  cursor: pointer;
  font-size: 11px;
  transition: all 0.2s;
}

.small-btn:hover { border-color: var(--cyan); color: var(--text); }
.small-btn.active { background: var(--cyan-dim); border-color: var(--cyan); color: var(--cyan); }
.small-btn.cyan { background: var(--cyan-dim); border-color: var(--cyan); color: var(--cyan); }
.small-btn.danger { border-color: #ff4466; color: #ff4466; }
.small-btn.danger:hover { background: rgba(255,68,102,0.1); }

/* Admin panel */
.admin-panel {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.user-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 12px;
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}

.user-row:hover { border-color: rgba(255,255,255,0.12); }

.user-details { display: flex; flex-direction: column; gap: 2px; }
.user-info { font-size: 13px; display: flex; align-items: center; gap: 8px; }
.user-email { font-size: 11px; color: var(--text-dim); word-break: break-all; }
.user-actions { display: flex; gap: 6px; align-items: center; }
.you-label { font-size: 11px; color: var(--text-dim); font-style: italic; }

.edit-panel {
  background: rgba(0, 210, 255, 0.04);
  border: 1px solid rgba(0, 210, 255, 0.15);
  border-radius: var(--radius);
  padding: 12px;
}

.edit-btn-row {
  display: flex;
  gap: 8px;
}

.edit-btn-row .small-btn { flex: 1; padding: 10px; font-size: 13px; font-weight: 600; text-align: center; }

.add-user-heading {
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 12px;
  margin-bottom: 4px;
}

.add-user-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.add-user-form input, .add-user-form select {
  background: var(--bg-dark);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 13px;
  width: 100%;
}

.add-user-form select { width: 100%; }
.add-user-form input:focus, .add-user-form select:focus { border-color: var(--cyan); outline: none; }

.add-user-form .small-btn.cyan {
  width: 100%;
  padding: 10px;
  font-size: 13px;
  font-weight: 600;
}

.pw-wrap-small {
  position: relative;
}

.pw-wrap-small input {
  width: 100%;
  padding-right: 34px !important;
}

.pw-toggle-small {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 2px;
  line-height: 1;
}

.pw-toggle-small:hover { color: var(--cyan); }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
  cursor: pointer;
}

.checkbox-row input[type=checkbox] {
  accent-color: var(--cyan);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.admin-msg {
  font-size: 12px;
  color: var(--cyan);
  min-height: 16px;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }