/**
 * Neumorphism Design System for NeuSynth Prime
 * Studio Workstation Soft UI Design System
 * Features refined dual drop shadows, metallic accents, tactile deboss sockets,
 * smooth convex/concave keys, and dual Dark (Obsidian) & Light (Porcelain) themes.
 */

:root {
  /* Dark Obsidian Theme (Default) */
  --bg-color: #121519;
  --chassis-bg: #1e2228;
  --surface-color: #242932;
  --surface-light: #2d333e;
  --surface-dark: #181c22;
  --surface-deep: #111418;

  /* Neumorphic Shadows */
  --shadow-light: rgba(255, 255, 255, 0.06);
  --shadow-dark: rgba(0, 0, 0, 0.7);
  --shadow-dark-deep: rgba(0, 0, 0, 0.88);

  --neu-chassis: 20px 20px 45px #0a0c0f, -12px -12px 35px rgba(255, 255, 255, 0.04);
  --neu-flat: 6px 6px 14px var(--shadow-dark), -5px -5px 12px var(--shadow-light);
  --neu-convex: 5px 5px 12px var(--shadow-dark), -4px -4px 10px var(--shadow-light);
  --neu-concave: inset 4px 4px 8px var(--shadow-dark-deep), inset -3px -3px 6px var(--shadow-light);
  --neu-pressed: inset 3px 3px 6px var(--shadow-dark-deep), inset -2px -2px 5px var(--shadow-light);
  --neu-well: inset 5px 5px 12px var(--shadow-dark-deep), inset -3px -3px 8px var(--shadow-light);
  --neu-ridge: 1px solid rgba(255, 255, 255, 0.05);

  /* Luminous Accents */
  --accent-cyan: #00f0ff;
  --accent-cyan-glow: rgba(0, 240, 255, 0.65);
  --accent-amber: #ffaa00;
  --accent-amber-glow: rgba(255, 170, 0, 0.7);
  --accent-emerald: #00e676;
  --accent-emerald-glow: rgba(0, 230, 118, 0.75);
  --accent-crimson: #ff1744;
  --accent-crimson-glow: rgba(255, 23, 68, 0.75);
  --accent-purple: #b388ff;
  --accent-purple-glow: rgba(179, 136, 255, 0.6);

  /* Text & Labels */
  --text-main: #e2e8f0;
  --text-muted: #8290a2;
  --text-dim: #546274;
  --text-highlight: #ffffff;

  /* Panoramic Cyber-OLED Display */
  --oled-bezel: #0e1115;
  --oled-glass: #0b1016;
  --oled-inner-border: #1a2330;
  --oled-text: #c0d8e8;
  --oled-highlight: #00f0ff;
  --oled-tab-bg: #141b24;
  --oled-tab-active: #1d2836;
  --oled-tab-border: #243447;

  /* Piano Key Surfaces */
  --key-white-bg: linear-gradient(180deg, #2b313c 0%, #232831 60%, #1c2027 100%);
  --key-white-text: #8c9cb0;
  --key-black-bg: linear-gradient(180deg, #14161a 0%, #101215 70%, #0b0d0f 100%);
  --key-black-text: #606d7e;
}

/* Light Porcelain Theme */
body.light-theme {
  --bg-color: #dce3ed;
  --chassis-bg: #e9eff7;
  --surface-color: #ebf1f8;
  --surface-light: #ffffff;
  --surface-dark: #cdd8e6;
  --surface-deep: #bcc9da;

  --shadow-light: rgba(255, 255, 255, 0.95);
  --shadow-dark: rgba(154, 172, 196, 0.55);
  --shadow-dark-deep: rgba(135, 154, 180, 0.75);

  --neu-chassis: 22px 22px 48px #bdc9d8, -16px -16px 40px #ffffff;
  --neu-flat: 6px 6px 14px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
  --neu-convex: 5px 5px 12px var(--shadow-dark), -5px -5px 10px var(--shadow-light);
  --neu-concave: inset 4px 4px 8px var(--shadow-dark-deep), inset -4px -4px 8px var(--shadow-light);
  --neu-pressed: inset 3px 3px 6px var(--shadow-dark-deep), inset -3px -3px 6px var(--shadow-light);
  --neu-well: inset 6px 6px 14px var(--shadow-dark-deep), inset -4px -4px 10px var(--shadow-light);
  --neu-ridge: 1px solid rgba(255, 255, 255, 0.8);

  --text-main: #212936;
  --text-muted: #5e6f86;
  --text-dim: #8b9bb2;
  --text-highlight: #0b1017;

  /* OLED Display in Light Theme (High Contrast Obsidian Core) */
  --oled-bezel: #252e3b;
  --oled-glass: #0b1118;
  --oled-inner-border: #1a2533;
  --oled-text: #c0d8e8;
  --oled-highlight: #00f0ff;
  --oled-tab-bg: #121922;
  --oled-tab-active: #1a2533;
  --oled-tab-border: #26364a;

  /* Piano Keys in Light Theme */
  --key-white-bg: linear-gradient(180deg, #ffffff 0%, #f4f7fb 60%, #e8edf5 100%);
  --key-white-text: #526277;
  --key-black-bg: linear-gradient(180deg, #2b333f 0%, #1e242d 70%, #13171d 100%);
  --key-black-text: #8fa0b5;
}

/* -------------------------------------------------------------
 * Neumorphic Primitives
 * ----------------------------------------------------------- */

.neu-chassis {
  background: var(--chassis-bg);
  box-shadow: var(--neu-chassis);
  border: var(--neu-ridge);
  border-radius: 28px;
  transition: all 0.3s ease;
}

.neu-bay {
  background: var(--surface-color);
  box-shadow: var(--neu-convex);
  border: 1px solid var(--shadow-light);
  border-radius: 20px;
  padding: 18px;
  position: relative;
}

.neu-well {
  background: var(--surface-dark);
  box-shadow: var(--neu-well);
  border-radius: 16px;
}

.neu-knob-socket {
  padding: 5px;
  border-radius: 50%;
  background: var(--surface-dark);
  box-shadow: inset 3px 3px 6px var(--shadow-dark-deep), inset -2px -2px 4px var(--shadow-light);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.neu-knob {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, var(--surface-light) 0%, var(--surface-color) 60%, var(--surface-dark) 100%);
  box-shadow: var(--neu-convex);
  position: relative;
  cursor: grab;
  touch-action: none;
  border: 1px solid var(--shadow-light);
  transition: box-shadow 0.15s ease;
}

.neu-knob.hero-knob {
  width: 68px;
  height: 68px;
}

.neu-knob:active {
  cursor: grabbing;
  box-shadow: var(--neu-concave);
}

.neu-knob::after {
  content: "";
  position: absolute;
  top: 15%;
  left: 15%;
  width: 70%;
  height: 70%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, var(--surface-color) 0%, var(--surface-dark) 100%);
  box-shadow: inset 2px 2px 4px var(--shadow-dark), inset -1px -1px 3px var(--shadow-light);
  pointer-events: none;
}

.knob-indicator {
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 10px;
  background: #ffffff;
  border-radius: 2px;
  box-shadow: 0 0 5px rgba(255, 255, 255, 0.9);
  z-index: 2;
  pointer-events: none;
}

/* Tactile Buttons */
.neu-btn {
  background: var(--surface-color);
  box-shadow: var(--neu-convex);
  border: 1px solid var(--shadow-light);
  border-radius: 10px;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 8px 14px;
  cursor: pointer;
  user-select: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.neu-btn:hover {
  filter: brightness(1.06);
}

.neu-btn:active,
.neu-btn.pressed {
  box-shadow: var(--neu-pressed);
  transform: translateY(1px);
}

.neu-btn.active {
  box-shadow: var(--neu-pressed);
  color: var(--accent-cyan);
  border-color: rgba(0, 240, 255, 0.35);
}

.neu-btn.transport-play.playing {
  box-shadow: var(--neu-pressed), 0 0 12px var(--accent-emerald-glow);
  color: var(--accent-emerald);
  border-color: rgba(0, 230, 118, 0.5);
  animation: pulse-emerald 1s infinite alternate ease-in-out;
}

@keyframes pulse-emerald {
  0% { box-shadow: var(--neu-pressed), 0 0 4px var(--accent-emerald-glow); }
  100% { box-shadow: var(--neu-pressed), 0 0 16px var(--accent-emerald-glow); }
}

.neu-btn.transport-rec.active {
  box-shadow: var(--neu-pressed), 0 0 12px var(--accent-crimson-glow);
  color: var(--accent-crimson);
  border-color: rgba(255, 23, 68, 0.5);
}