/* ============================================
   KLAVIS — Interactive Piano
   Dark Luxury × Noir Editorial
   Cormorant Garamond + Space Mono
   ============================================ */

:root {
  --bg:           #080810;
  --bg-panel:     #0e0e1a;
  --bg-card:      #12121f;
  --bg-inset:     #0a0a14;
  --border:       #1e1e30;
  --border-mid:   #2a2a40;
  --border-hi:    #3a3a55;

  --text:         #e8e4f0;
  --text-dim:     #6060a0;
  --text-muted:   #30305a;

  --gold:         #c9a84c;
  --gold-dim:     #6a5520;
  --gold-glow:    rgba(201,168,76,0.25);

  --violet:       #7b68ee;
  --violet-dim:   #2a2460;
  --violet-glow:  rgba(123,104,238,0.3);

  --cyan:         #00e5ff;
  --cyan-glow:    rgba(0,229,255,0.2);

  --white-key-bg:    #f0eef8;
  --white-key-press: #d4d0f0;
  --black-key-bg:    #0d0d18;
  --black-key-press: #1a1a30;

  --font-serif: 'Cormorant Garamond', serif;
  --font-mono:  'Space Mono', monospace;

  --radius: 4px;
  --radius-lg: 10px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
button { cursor: pointer; font-family: var(--font-mono); border: none; background: none; }
input  { font-family: var(--font-mono); }

html, body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  overflow-x: hidden;
}

/* ── Ambient Background ── */
.ambient-bg {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  overflow: hidden;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.12;
}
.orb-1 {
  width: 600px; height: 600px;
  background: var(--violet);
  top: -200px; left: -100px;
  animation: drift1 18s ease-in-out infinite alternate;
}
.orb-2 {
  width: 400px; height: 400px;
  background: var(--gold);
  bottom: -100px; right: -50px;
  animation: drift2 22s ease-in-out infinite alternate;
}
.orb-3 {
  width: 300px; height: 300px;
  background: var(--cyan);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation: drift3 15s ease-in-out infinite alternate;
}
@keyframes drift1 { to { transform: translate(60px, 80px); } }
@keyframes drift2 { to { transform: translate(-40px, -60px); } }
@keyframes drift3 { to { transform: translate(-50%, -50%) scale(1.3); opacity: 0.06; } }

/* ── App Shell ── */
.app {
  position: relative; z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px 20px 48px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* ── Header ── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.logo {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 300;
  letter-spacing: 0.15em;
  line-height: 1;
}
.logo-k { color: var(--gold); }
.logo-rest { color: var(--text); }

.header-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--text-dim);
}
.meta-sep { color: var(--text-muted); }
#note-display {
  color: var(--gold);
  min-width: 60px;
  text-align: center;
  font-size: 13px;
  transition: color 0.2s;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Waveform selector */
.waveform-selector {
  display: flex;
  gap: 4px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px;
}
.wave-btn {
  width: 30px; height: 26px;
  border-radius: 2px;
  font-size: 14px;
  color: var(--text-dim);
  transition: all 0.15s;
  display: flex; align-items: center; justify-content: center;
}
.wave-btn:hover { color: var(--text); background: var(--border); }
.wave-btn.active {
  background: var(--violet-dim);
  color: var(--violet);
  box-shadow: 0 0 8px var(--violet-glow);
}

/* Volume */
.volume-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}
.vol-icon { font-size: 12px; color: var(--text-dim); }
.vol-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 90px; height: 3px;
  background: var(--border-mid);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
.vol-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 8px var(--gold-glow);
  cursor: pointer;
}
.vol-slider::-moz-range-thumb {
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--gold);
  border: none;
  box-shadow: 0 0 8px var(--gold-glow);
}

/* ── Piano Section ── */
.piano-section {
  display: flex;
  justify-content: center;
}

.piano-wrap {
  position: relative;
  padding: 24px 24px 0;
  background: var(--bg-card);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-lg);
  box-shadow:
    0 0 0 1px var(--bg),
    0 20px 60px rgba(0,0,0,0.6),
    inset 0 1px 0 rgba(255,255,255,0.03);
  overflow: hidden;
}
.piano-wrap::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold-dim), var(--violet-dim), transparent);
}

.piano {
  position: relative;
  display: flex;
  height: 200px;
  user-select: none;
  -webkit-user-select: none;
}

/* ── White Keys ── */
.key-white {
  position: relative;
  width: 48px;
  height: 200px;
  background: linear-gradient(180deg, #f0eef8 0%, #e8e4f4 60%, #ddd8f0 100%);
  border: 1px solid #b0a8d0;
  border-top: none;
  border-radius: 0 0 6px 6px;
  cursor: pointer;
  transition: background 0.06s, box-shadow 0.06s, transform 0.06s;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.4), inset 0 -2px 4px rgba(0,0,0,0.1);
}
.key-white:hover {
  background: linear-gradient(180deg, #ffffff 0%, #f0ecff 60%, #e4deff 100%);
  box-shadow: 0 4px 16px rgba(123,104,238,0.3), inset 0 -2px 4px rgba(0,0,0,0.1);
}
.key-white.pressed {
  background: linear-gradient(180deg, #c8c0f0 0%, #b8b0e8 60%, #a8a0d8 100%);
  transform: scaleY(0.98) translateY(2px);
  box-shadow:
    0 2px 4px rgba(0,0,0,0.4),
    0 0 20px var(--violet-glow),
    0 0 40px rgba(123,104,238,0.15),
    inset 0 2px 4px rgba(0,0,0,0.2);
}
.key-white.playback {
  background: linear-gradient(180deg, #c0d8f0 0%, #b0c8e8 60%, #a0b8d8 100%);
  box-shadow: 0 0 20px var(--cyan-glow), 0 0 40px rgba(0,229,255,0.1);
}

.key-label {
  font-size: 8px;
  font-family: var(--font-mono);
  color: #8880b0;
  letter-spacing: 0.05em;
  line-height: 1;
  text-align: center;
}
.key-label .note-name {
  display: block;
  font-size: 9px;
  color: #6060a0;
  margin-bottom: 2px;
}
.key-label .kb-key {
  display: block;
  font-size: 8px;
  color: #a0a0c0;
  background: rgba(0,0,0,0.08);
  border-radius: 2px;
  padding: 1px 3px;
}

/* ── Black Keys ── */
.key-black {
  position: absolute;
  width: 30px;
  height: 120px;
  background: linear-gradient(180deg, #1a1828 0%, #0d0d18 50%, #080810 100%);
  border: 1px solid #2a2840;
  border-top: none;
  border-radius: 0 0 5px 5px;
  cursor: pointer;
  z-index: 2;
  transition: background 0.06s, box-shadow 0.06s, transform 0.06s;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 8px;
  box-shadow: 2px 4px 10px rgba(0,0,0,0.7), inset 0 -1px 3px rgba(255,255,255,0.03);
}
.key-black:hover {
  background: linear-gradient(180deg, #2a2840 0%, #1a1830 50%, #100e20 100%);
  box-shadow: 2px 4px 16px rgba(0,0,0,0.7), 0 0 12px var(--violet-glow);
}
.key-black.pressed {
  background: linear-gradient(180deg, #3a3060 0%, #2a2050 50%, #1a1040 100%);
  transform: scaleY(0.97) translateY(2px);
  box-shadow:
    1px 2px 6px rgba(0,0,0,0.7),
    0 0 16px var(--violet-glow),
    0 0 30px rgba(123,104,238,0.2),
    inset 0 1px 3px rgba(0,0,0,0.5);
}
.key-black.playback {
  background: linear-gradient(180deg, #103040 0%, #082030 50%, #041820 100%);
  box-shadow: 1px 2px 6px rgba(0,0,0,0.7), 0 0 16px var(--cyan-glow);
}

.key-black .key-label {
  color: #4040a0;
}
.key-black .key-label .note-name { color: #5050a0; font-size: 7px; }
.key-black .key-label .kb-key { color: #6060a0; font-size: 7px; background: rgba(255,255,255,0.04); }

/* ── Recorder Panel ── */
.recorder-panel {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-lg);
}

.recorder-left {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rec-status {
  display: flex;
  align-items: center;
  gap: 8px;
}
.rec-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  border: 1px solid var(--border-mid);
  transition: background 0.2s, box-shadow 0.2s;
}
.rec-dot.recording {
  background: #ff3333;
  box-shadow: 0 0 8px rgba(255,51,51,0.7);
  animation: pulse-rec 0.8s ease-in-out infinite;
}
.rec-dot.playing {
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan-glow);
  animation: pulse-play 1s ease-in-out infinite;
}
@keyframes pulse-rec  { 0%,100%{opacity:1} 50%{opacity:0.3} }
@keyframes pulse-play { 0%,100%{transform:scale(1)} 50%{transform:scale(1.4)} }

.rec-label {
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  transition: color 0.2s;
}
.rec-label.recording { color: #ff5555; }
.rec-label.playing   { color: var(--cyan); }

.rec-timer {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}

/* Recorder buttons */
.recorder-center {
  display: flex;
  gap: 10px;
  align-items: center;
}

.rec-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 8px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  border: 1px solid var(--border-mid);
  background: var(--bg-inset);
  transition: all 0.15s;
  min-width: 56px;
}
.rec-btn svg { width: 14px; height: 14px; }
.rec-btn:hover:not(:disabled) {
  border-color: var(--gold);
  color: var(--gold);
  box-shadow: 0 0 12px var(--gold-glow);
}
.rec-btn:active:not(:disabled) { transform: scale(0.95); }
.rec-btn:disabled { opacity: 0.3; cursor: not-allowed; }

.rec-btn#btn-record { color: #ff5555; border-color: #3a1515; }
.rec-btn#btn-record:hover:not(:disabled) {
  border-color: #ff3333;
  color: #ff5555;
  box-shadow: 0 0 12px rgba(255,51,51,0.3);
}
.rec-btn#btn-record.active {
  background: rgba(255,51,51,0.1);
  border-color: #ff3333;
  color: #ff5555;
  box-shadow: 0 0 16px rgba(255,51,51,0.3);
}

.rec-btn#btn-play:hover:not(:disabled) {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 12px var(--cyan-glow);
}
.rec-btn#btn-play.active {
  background: rgba(0,229,255,0.08);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 16px var(--cyan-glow);
}

/* Recorder right */
.recorder-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 20px;
}
.playback-info { text-align: center; }
.pb-label {
  font-size: 7px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.pb-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--gold);
}

/* Loop toggle */
.loop-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}
.loop-toggle input { display: none; }
.loop-track {
  width: 34px; height: 18px;
  background: var(--bg-inset);
  border: 1px solid var(--border-mid);
  border-radius: 9px;
  position: relative;
  transition: background 0.2s, border-color 0.2s;
}
.loop-thumb {
  position: absolute;
  top: 2px; left: 2px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: transform 0.2s, background 0.2s;
}
.loop-toggle input:checked ~ .loop-track {
  background: var(--violet-dim);
  border-color: var(--violet);
}
.loop-toggle input:checked ~ .loop-track .loop-thumb {
  transform: translateX(16px);
  background: var(--violet);
  box-shadow: 0 0 6px var(--violet-glow);
}
.loop-text {
  font-size: 8px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
}

/* ── Keyboard Map ── */
.keymap-section {
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.keymap-title {
  font-size: 8px;
  letter-spacing: 0.25em;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.keymap-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.km-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: 9px;
}
.km-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px; height: 20px;
  background: var(--bg-panel);
  border: 1px solid var(--border-hi);
  border-radius: 3px;
  color: var(--text);
  font-size: 9px;
  font-weight: 700;
  padding: 0 4px;
  box-shadow: 0 2px 0 var(--border-hi);
}
.km-note {
  color: var(--text-dim);
  font-size: 9px;
}
.km-note.sharp { color: var(--violet); }

/* ── Visualizer ── */
.visualizer {
  width: 100%;
  height: 60px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: block;
}

/* ── Responsive ── */
@media (max-width: 780px) {
  .piano-wrap { padding: 16px 12px 0; overflow-x: auto; }
  .piano { height: 160px; }
  .key-white { width: 38px; height: 160px; }
  .key-black { width: 24px; height: 96px; }
  .recorder-panel { grid-template-columns: 1fr; gap: 16px; }
  .recorder-right { justify-content: flex-start; }
  .header { gap: 12px; }
}
@media (max-width: 520px) {
  .app { padding: 16px 12px 32px; gap: 16px; }
  .logo { font-size: 24px; }
  .rec-timer { font-size: 22px; }
  .key-white { width: 32px; }
  .key-black { width: 20px; }
  .key-label .kb-key { display: none; }
}