/* ============================================================
   DRUM-MACHINE.CSS — Dr_Fun Drum Machine Styles
   Resistor Technology · resistor.technology

   Two themes: "bunker" (site default) and "vintage" (classic 808).
   All custom properties prefixed --dm-* to avoid conflicts.
   All classes BEM-prefixed dm__ to avoid conflicts.
   ============================================================ */

/* --- Theme: Bunker (default — matches site aesthetic) --- */
.drum-machine,
.drum-machine[data-theme="bunker"] {
  --dm-bg:              #0e0e12;
  --dm-surface:         #14141a;
  --dm-surface-raised:  #1e1e24;
  --dm-border:          #2a2a30;
  --dm-border-light:    #3a3a40;
  --dm-text:            #d8d5cd;
  --dm-text-secondary:  #9a9a9e;
  --dm-text-muted:      #6a6a70;
  --dm-accent:          #c4a67a;
  --dm-accent-light:    #d4be88;
  --dm-accent-dark:     #a08050;

  /* Step group colors (4 groups of 4) */
  --dm-step-g1:         #c4a67a;   /* brass */
  --dm-step-g2:         #a080c0;   /* amethyst */
  --dm-step-g3:         #6aaa9a;   /* teal */
  --dm-step-g4:         #9a9a9e;   /* silver */

  /* VU meter */
  --dm-vu-bg:           linear-gradient(to bottom, #2a2018, #1a1408);
  --dm-vu-border:       #5a4a20;
  --dm-vu-text:         rgba(200, 160, 60, 0.5);
  --dm-vu-needle:       rgba(200, 160, 60, 0.9);
  --dm-vu-needle-tip:   rgba(200, 160, 60, 0.3);
  --dm-vu-scale:        rgba(200, 160, 60, 0.25);
  --dm-vu-hub:          #8a7a40;

  /* LED */
  --dm-led-on:          #c4a67a;
  --dm-led-off:         #1a1a20;
  --dm-led-glow:        rgba(196, 166, 122, 0.6);

  /* Fonts */
  --dm-font-display:    'Space Grotesk', sans-serif;
  --dm-font-mono:       'IBM Plex Mono', monospace;
}

/* --- Theme: Vintage (classic 808) --- */
.drum-machine[data-theme="vintage"] {
  --dm-bg:              #2a2018;
  --dm-surface:         #342a1e;
  --dm-surface-raised:  #3e3428;
  --dm-border:          #504030;
  --dm-border-light:    #6a5a48;
  --dm-text:            #f0e8d8;
  --dm-text-secondary:  #c8c0b0;
  --dm-text-muted:      #8a8070;
  --dm-accent:          #f0c040;
  --dm-accent-light:    #ffd860;
  --dm-accent-dark:     #c8a030;

  /* Classic 808 step colors */
  --dm-step-g1:         #e84040;   /* red */
  --dm-step-g2:         #f09030;   /* orange */
  --dm-step-g3:         #f0c040;   /* yellow */
  --dm-step-g4:         #e0d8c8;   /* white */

  /* VU meter — cream face */
  --dm-vu-bg:           linear-gradient(to bottom, #f5f0e0, #e8e0c8);
  --dm-vu-border:       #a09070;
  --dm-vu-text:         rgba(40, 30, 20, 0.6);
  --dm-vu-needle:       rgba(20, 15, 10, 0.9);
  --dm-vu-needle-tip:   rgba(20, 15, 10, 0.3);
  --dm-vu-scale:        rgba(40, 30, 20, 0.25);
  --dm-vu-hub:          #504030;

  /* LED */
  --dm-led-on:          #f04040;
  --dm-led-off:         #2a1a1a;
  --dm-led-glow:        rgba(240, 64, 64, 0.6);

  /* Fonts — fallback stack */
  --dm-font-display:    Helvetica, Arial, sans-serif;
  --dm-font-mono:       'Courier New', Courier, monospace;
}

/* ============================================================
   CONTAINER
   ============================================================ */

.drum-machine {
  background: var(--dm-bg);
  border: 1px solid var(--dm-border);
  border-radius: 12px;
  padding: 1.5rem;
  max-width: 720px;
  margin: 0 auto;
  font-family: var(--dm-font-mono);
  color: var(--dm-text);
  user-select: none;
  -webkit-user-select: none;
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

/* ============================================================
   HEADER ROW
   ============================================================ */

.dm__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.dm__title {
  font-family: var(--dm-font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--dm-accent);
}

.dm__transport {
  display: flex;
  gap: 0.5rem;
}

.dm__btn {
  padding: 0.4rem 1rem;
  border: 1px solid var(--dm-border-light);
  border-radius: 4px;
  background: var(--dm-surface);
  color: var(--dm-text-secondary);
  font-family: var(--dm-font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: background 150ms, border-color 150ms, color 150ms;
}

.dm__btn:hover {
  background: var(--dm-surface-raised);
  border-color: var(--dm-accent);
  color: var(--dm-text);
}

.dm__btn:focus-visible {
  outline: 2px solid var(--dm-accent);
  outline-offset: 2px;
}

.dm__btn.is-active {
  background: var(--dm-accent);
  border-color: var(--dm-accent);
  color: var(--dm-bg);
}

.dm__theme-toggle {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--dm-border);
  border-radius: 4px;
  background: transparent;
  color: var(--dm-text-muted);
  font-family: var(--dm-font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 150ms, border-color 150ms;
}

.dm__theme-toggle:hover {
  color: var(--dm-text);
  border-color: var(--dm-border-light);
}

.dm__theme-toggle:focus-visible {
  outline: 2px solid var(--dm-accent);
  outline-offset: 2px;
}

/* ============================================================
   LED STRIP — 16 position indicators
   ============================================================ */

.dm__leds {
  display: flex;
  gap: 4px;
  justify-content: center;
  margin-bottom: 1rem;
  padding: 0.5rem 0;
}

.dm__led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--dm-led-off);
  transition: background 80ms, box-shadow 80ms;
  flex-shrink: 0;
}

.dm__led.is-active {
  background: var(--dm-led-on);
  box-shadow: 0 0 6px var(--dm-led-glow), 0 0 12px var(--dm-led-glow);
}

/* ============================================================
   CONTROLS ROW — Volume, Tune, BPM, VU Meter
   ============================================================ */

.dm__controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.dm__knob-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

/* --- Rotary Knob (matches site knob style) --- */

.dm__knob-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  cursor: grab;
  touch-action: none;
  user-select: none;
  outline: none;
}

.dm__knob-wrap:active {
  cursor: grabbing;
}

.dm__knob-wrap.is-active {
  cursor: grabbing;
}

.dm__knob-label {
  font-family: var(--dm-font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--dm-text-muted);
  text-align: center;
}

.dm__knob {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  position: relative;
  background: conic-gradient(from 200deg, #1a1a1a, #3a3a3a 90deg, #2a2a2a 180deg, #3a3a3a 270deg, #1a1a1a);
  box-shadow:
    0 3px 8px rgba(0, 0, 0, 0.6),
    inset 0 -2px 4px rgba(0, 0, 0, 0.4),
    inset 0 2px 3px rgba(255, 255, 255, 0.06),
    0 0 0 2px #111;
  transition: box-shadow 150ms;
}

.dm__knob:hover {
  box-shadow:
    0 3px 8px rgba(0, 0, 0, 0.6),
    inset 0 -2px 4px rgba(0, 0, 0, 0.4),
    inset 0 2px 3px rgba(255, 255, 255, 0.06),
    0 0 0 2px #111,
    0 0 12px rgba(196, 166, 122, 0.2);
}

.dm__knob-wrap:focus-visible .dm__knob {
  box-shadow:
    0 3px 8px rgba(0, 0, 0, 0.6),
    inset 0 -2px 4px rgba(0, 0, 0, 0.4),
    inset 0 2px 3px rgba(255, 255, 255, 0.06),
    0 0 0 3px var(--dm-accent);
}

/* Knob hub */
.dm__knob-cap {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 12px;
  height: 12px;
  background: radial-gradient(circle, #444, #222);
  border-radius: 50%;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Knob pointer */
.dm__knob::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 10px;
  background: #e8e0d0;
  border-radius: 1px;
}

.dm__knob--small {
  /* Smaller knob variant */
}

.dm__knob--small .dm__knob {
  width: 36px;
  height: 36px;
}

.dm__knob--small .dm__knob::after {
  top: 3px;
  height: 8px;
}

.dm__knob--small .dm__knob-cap {
  width: 10px;
  height: 10px;
}

/* --- BPM Display --- */

.dm__bpm-display {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dm__bpm-value {
  font-family: var(--dm-font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--dm-accent);
  min-width: 3ch;
  text-align: center;
  background: rgba(0, 0, 0, 0.3);
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--dm-border);
  border-radius: 3px;
}

.dm__bpm-label {
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--dm-text-muted);
}

.dm__bpm-btn {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--dm-border);
  border-radius: 3px;
  background: var(--dm-surface);
  color: var(--dm-text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 150ms, color 150ms;
  line-height: 1;
}

.dm__bpm-btn:hover {
  background: var(--dm-surface-raised);
  color: var(--dm-text);
}

.dm__bpm-btn:focus-visible {
  outline: 2px solid var(--dm-accent);
  outline-offset: 1px;
}

/* --- VU Meter Container --- */

.dm__vu-container {
  flex-shrink: 0;
}

.dm__vu-meter {
  width: 100px;
  height: 56px;
  background: var(--dm-vu-bg);
  border: 1px solid var(--dm-vu-border);
  border-radius: 4px;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
  box-shadow:
    0 2px 6px rgba(0, 0, 0, 0.5),
    inset 0 0 20px rgba(200, 160, 60, 0.08);
}

.dm__vu-face {
  position: absolute;
  top: 4px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--dm-font-mono);
  font-size: 6px;
  color: var(--dm-vu-text);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.dm__vu-scale {
  position: absolute;
  bottom: 12px;
  left: 10px;
  right: 10px;
  height: 26px;
  border-top: 1px solid var(--dm-vu-scale);
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
}

.dm__vu-marks {
  position: absolute;
  bottom: 10px;
  left: 8px;
  right: 8px;
  display: flex;
  justify-content: space-between;
  font-family: var(--dm-font-mono);
  font-size: 5px;
  color: var(--dm-vu-text);
}

.dm__vu-needle {
  position: absolute;
  bottom: 8px;
  left: 50%;
  width: 1px;
  height: 34px;
  background: linear-gradient(to top, var(--dm-vu-needle), var(--dm-vu-needle-tip));
  transform-origin: bottom center;
  transform: rotate(-30deg);
  box-shadow: 0 0 3px rgba(200, 160, 60, 0.3);
}

.dm__vu-needle::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--dm-vu-hub);
  border-radius: 50%;
}

/* ============================================================
   INSTRUMENT BUTTONS
   ============================================================ */

.dm__instruments {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.dm__inst-btn {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--dm-border);
  border-radius: 4px;
  background: var(--dm-surface);
  color: var(--dm-text-muted);
  font-family: var(--dm-font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 150ms, border-color 150ms, color 150ms;
  min-width: 48px;
  text-align: center;
}

.dm__inst-btn:hover {
  background: var(--dm-surface-raised);
  color: var(--dm-text-secondary);
}

.dm__inst-btn:focus-visible {
  outline: 2px solid var(--dm-accent);
  outline-offset: 2px;
}

.dm__inst-btn.is-selected {
  background: var(--dm-accent-dark);
  border-color: var(--dm-accent);
  color: var(--dm-text);
}

/* ============================================================
   PAGE BUTTONS
   ============================================================ */

.dm__pages {
  display: flex;
  gap: 0.4rem;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.dm__page-btn {
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--dm-border);
  border-radius: 3px;
  background: var(--dm-surface);
  color: var(--dm-text-muted);
  font-family: var(--dm-font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 150ms, border-color 150ms, color 150ms;
}

.dm__page-btn:hover {
  background: var(--dm-surface-raised);
  color: var(--dm-text-secondary);
}

.dm__page-btn:focus-visible {
  outline: 2px solid var(--dm-accent);
  outline-offset: 2px;
}

.dm__page-btn.is-active {
  background: var(--dm-accent-dark);
  border-color: var(--dm-accent);
  color: var(--dm-text);
}

/* Page has-data indicator dot */
.dm__page-btn .dm__page-dot {
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: transparent;
  margin-left: 4px;
  vertical-align: middle;
  transition: background 150ms;
}

.dm__page-btn.has-data .dm__page-dot {
  background: var(--dm-accent);
}

/* ============================================================
   STEP GRID — 16 steps in 4 groups of 4
   ============================================================ */

.dm__step-grid {
  display: flex;
  gap: 3px;
  justify-content: center;
  padding: 0.75rem 0;
}

/* Visual gap between groups of 4 */
.dm__step-group {
  display: flex;
  gap: 3px;
}

.dm__step-group + .dm__step-group {
  margin-left: 6px;
}

.dm__step-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--dm-border);
  border-radius: 3px;
  background: var(--dm-surface);
  cursor: pointer;
  transition: background 100ms, border-color 100ms, box-shadow 100ms;
  position: relative;
}

.dm__step-btn:hover {
  border-color: var(--dm-border-light);
}

.dm__step-btn:focus-visible {
  outline: 2px solid var(--dm-accent);
  outline-offset: 1px;
}

/* Active step (has a hit programmed) — group colors via additional vars */
.dm__step-group:nth-child(1) .dm__step-btn.is-on {
  background: var(--dm-step-g1);
  border-color: var(--dm-step-g1);
}

.dm__step-group:nth-child(2) .dm__step-btn.is-on {
  background: var(--dm-step-g2);
  border-color: var(--dm-step-g2);
}

.dm__step-group:nth-child(3) .dm__step-btn.is-on {
  background: var(--dm-step-g3);
  border-color: var(--dm-step-g3);
}

.dm__step-group:nth-child(4) .dm__step-btn.is-on {
  background: var(--dm-step-g4);
  border-color: var(--dm-step-g4);
}

/* Glow per group (bunker theme) */
.drum-machine[data-theme="bunker"] .dm__step-group:nth-child(1) .dm__step-btn.is-on {
  box-shadow: 0 0 8px rgba(196, 166, 122, 0.4);
}
.drum-machine[data-theme="bunker"] .dm__step-group:nth-child(2) .dm__step-btn.is-on {
  box-shadow: 0 0 8px rgba(160, 128, 192, 0.4);
}
.drum-machine[data-theme="bunker"] .dm__step-group:nth-child(3) .dm__step-btn.is-on {
  box-shadow: 0 0 8px rgba(106, 170, 154, 0.4);
}
.drum-machine[data-theme="bunker"] .dm__step-group:nth-child(4) .dm__step-btn.is-on {
  box-shadow: 0 0 8px rgba(154, 154, 158, 0.4);
}

/* Glow per group (vintage theme) */
.drum-machine[data-theme="vintage"] .dm__step-group:nth-child(1) .dm__step-btn.is-on {
  box-shadow: 0 0 8px rgba(232, 64, 64, 0.4);
}
.drum-machine[data-theme="vintage"] .dm__step-group:nth-child(2) .dm__step-btn.is-on {
  box-shadow: 0 0 8px rgba(240, 144, 48, 0.4);
}
.drum-machine[data-theme="vintage"] .dm__step-group:nth-child(3) .dm__step-btn.is-on {
  box-shadow: 0 0 8px rgba(240, 192, 64, 0.4);
}
.drum-machine[data-theme="vintage"] .dm__step-group:nth-child(4) .dm__step-btn.is-on {
  box-shadow: 0 0 8px rgba(224, 216, 200, 0.4);
}

/* Current playback step highlight */
.dm__step-btn.is-current {
  box-shadow: inset 0 0 0 2px var(--dm-accent);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 600px) {
  .drum-machine {
    padding: 1rem;
    border-radius: 8px;
  }

  .dm__header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .dm__controls {
    gap: 0.75rem;
  }

  .dm__knob {
    width: 36px;
    height: 36px;
  }

  .dm__knob::after {
    top: 3px;
    height: 8px;
  }

  .dm__knob-cap {
    width: 10px;
    height: 10px;
  }

  .dm__step-btn {
    width: 28px;
    height: 28px;
  }

  .dm__vu-meter {
    width: 80px;
    height: 48px;
  }

  .dm__vu-needle {
    height: 28px;
  }

  .dm__instruments {
    gap: 0.25rem;
  }

  .dm__inst-btn {
    padding: 0.25rem 0.4rem;
    font-size: 0.6rem;
    min-width: 38px;
  }
}

@media (max-width: 400px) {
  .dm__step-btn {
    width: 22px;
    height: 22px;
  }

  .dm__step-group + .dm__step-group {
    margin-left: 3px;
  }

  .dm__vu-container {
    display: none;
  }

  .dm__bpm-value {
    font-size: 0.9rem;
  }

  .dm__controls {
    gap: 0.5rem;
  }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  .dm__led,
  .dm__step-btn,
  .dm__inst-btn,
  .dm__btn,
  .dm__page-btn,
  .dm__vu-needle,
  .dm__knob {
    transition: none !important;
  }

  .dm__vu-needle {
    display: none;
  }
}