/* ──────────────────────────────────────────────────────────────
   Beat Weaver — Styles
   Dark, focused music-app aesthetic
   ────────────────────────────────────────────────────────────── */

:root {
  --bg:           #0b0b0f;
  --surface:      #14141c;
  --surface2:     #1c1c28;
  --border:       #2c2c3e;
  --text:         #e2e2ef;
  --muted:        #66667a;
  --accent:       #7c6fff;

  /* Channel colours */
  --kick-color:   #ff6b35;
  --snare-color:  #4ecdc4;
  --bass-color:   #45b7d1;
  --melody-color: #a78bfa;

  /* State colours */
  --correct-bg:   rgba(72, 187, 120, 0.20);
  --correct-bdr:  #48bb78;
  --incorrect-bg: rgba(245, 101, 101, 0.15);
  --incorrect-bdr:#f56565;
  --blank-bdr:    #44445a;
  --active-bg:    rgba(124, 111, 255, 0.08);

  --radius:       6px;
  --gap:          4px;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Courier New', Courier, monospace;
  font-size: 14px;
  min-height: 100vh;
  overflow-x: hidden;
  user-select: none;
}

button { cursor: pointer; font-family: inherit; }

.hidden { display: none !important; }

/* ── Mute button — always on top ──────────────────────────── */
#mute-btn {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 9999;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 16px;
  color: var(--text);
  transition: background 0.15s;
}
#mute-btn:hover { background: var(--surface); }

/* ── Overlay (audio prompt, win screen) ────────────────────── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.overlay-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 40px;
  text-align: center;
  max-width: 320px;
}

/* Audio prompt */
#audio-prompt { cursor: pointer; }
.audio-prompt-icon { font-size: 36px; margin-bottom: 8px; }

/* ── Title screen ───────────────────────────────────────────── */
#title-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.title-inner {
  text-align: center;
  max-width: 480px;
  padding: 32px;
}
.game-title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  letter-spacing: 0.05em;
  color: var(--text);
  margin-bottom: 8px;
}
.game-subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.game-desc {
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

/* ── Difficulty selector ───────────────────────────────────── */
#difficulty-selector {
  margin-bottom: 24px;
}
.difficulty-label {
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.difficulty-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.difficulty-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  text-align: left;
}
.difficulty-btn:hover:not(:disabled):not(.locked) {
  background: var(--surface);
  border-color: var(--accent);
}
.difficulty-btn.active {
  background: rgba(124, 111, 255, 0.15);
  border-color: var(--accent);
}
.difficulty-btn.locked {
  opacity: 0.5;
  cursor: not-allowed;
}
.difficulty-btn.locked .difficulty-icon {
  font-size: 0.9rem;
}
.difficulty-name {
  font-weight: bold;
  font-size: 0.95rem;
}
.difficulty-desc {
  color: var(--muted);
  font-size: 0.75rem;
  margin-left: auto;
}

/* Tooltip */
.tooltip {
  margin-top: 20px;
  background: var(--surface2);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 10px 16px;
  color: var(--muted);
  font-size: 0.85rem;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 12px 28px;
  font-size: 1rem;
  letter-spacing: 0.04em;
  transition: filter 0.15s, transform 0.1s;
}
.btn-primary:hover  { filter: brightness(1.15); }
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 20px;
  font-size: 0.9rem;
  transition: color 0.15s, border-color 0.15s;
}
.btn-secondary:hover { color: var(--text); border-color: var(--muted); }

.btn-icon {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 12px;
  font-size: 0.95rem;
  transition: background 0.15s;
}
.btn-icon:hover { background: var(--surface); }

/* ── Game screen ─────────────────────────────────────────────── */
#game-screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 8px;
  gap: 8px;
  max-width: 600px;
  margin: 0 auto;
}

/* Header */
#game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.header-left, .header-right { display: flex; align-items: center; gap: 8px; }
.level-label { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; }
.level-num { color: var(--text); font-size: 1.1rem; font-weight: bold; }
#closeness-counter { font-size: 1rem; color: var(--text); }
#matched { color: var(--accent); font-weight: bold; }
.matched-label { color: var(--muted); font-size: 0.75rem; margin-left: 4px; }
.percentage-label { color: var(--muted); font-size: 0.65rem; margin-left: 2px; }
.header-right { gap: 6px; padding-right: 42px; /* leave room for mute btn */ }

/* ── Grid ────────────────────────────────────────────────────── */
#grid-wrapper {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
  flex-shrink: 0;
}

/* Channel labels row */
#channel-labels {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
  margin-bottom: 6px;
}
.channel-label {
  text-align: center;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 0;
  border-radius: 3px;
}
.channel-label.kick   { color: var(--kick-color); }
.channel-label.snare  { color: var(--snare-color); }
.channel-label.bass   { color: var(--bass-color); }
.channel-label.melody { color: var(--melody-color); }

/* Grid container */
#grid {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

/* Each row */
.grid-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
  border-radius: 3px;
  transition: background 0.08s;
}
.grid-row.active {
  background: var(--active-bg);
}

/* Each cell */
.cell {
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: bold;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

/* Fixed (non-blank) cell */
.cell.filled {
  background: var(--surface2);
  border: 1px solid var(--border);
}
.cell[data-channel="kick"].filled   { border-color: rgba(255, 107, 53, 0.4); color: var(--kick-color); }
.cell[data-channel="snare"].filled  { border-color: rgba(78, 205, 196, 0.4); color: var(--snare-color); }
.cell[data-channel="bass"].filled   { border-color: rgba(69, 183, 209, 0.4); color: var(--bass-color); }
.cell[data-channel="melody"].filled { border-color: rgba(167, 139, 250, 0.4); color: var(--melody-color); }

/* Rest cell (silent step) */
.cell.rest {
  background: transparent;
  border: 1px solid transparent;
  opacity: 0.2;
}

/* Blank cell (puzzle — player fills this) */
.cell.blank {
  background: var(--surface2);
  border: 2px dashed var(--blank-bdr);
  cursor: pointer;
}
.cell.blank.drag-over {
  border-color: var(--accent);
  background: rgba(124, 111, 255, 0.12);
  transform: scale(1.04);
}

/* Player-placed correct */
.cell.blank.correct {
  background: var(--correct-bg);
  border: 2px solid var(--correct-bdr);
}
/* Player-placed incorrect */
.cell.blank.incorrect {
  background: var(--incorrect-bg);
  border: 2px solid var(--incorrect-bdr);
}

/* Channel-tinted blank cells */
.cell.blank[data-channel="kick"]   { color: var(--kick-color); }
.cell.blank[data-channel="snare"]  { color: var(--snare-color); }
.cell.blank[data-channel="bass"]   { color: var(--bass-color); }
.cell.blank[data-channel="melody"] { color: var(--melody-color); }

/* ── Win flash ────────────────────────────────────────────────── */
@keyframes winFlash {
  0%, 100% { filter: none; }
  25%, 75%  { filter: brightness(1.4) saturate(1.5); }
}
.win-flash { animation: winFlash 0.6s ease; }

/* Win overlay content */
.win-content { gap: 16px; display: flex; flex-direction: column; align-items: center; }
.win-glyph { font-size: 48px; }

/* ── Palette ──────────────────────────────────────────────────── */
#palette-wrapper {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
}
#palette-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 8px;
}
#palette {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* Palette tile */
.palette-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  min-width: 64px;
  cursor: grab;
  transition: transform 0.12s, border-color 0.12s, box-shadow 0.12s;
}
.palette-tile:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}
.palette-tile:active { cursor: grabbing; transform: scale(0.96); }
.palette-tile.dragging { opacity: 0.4; cursor: grabbing; }

.tile-icon    { font-size: 1.2rem; line-height: 1; }
.tile-channel { font-size: 0.55rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-top: 2px; }
.tile-count   { font-size: 0.7rem; color: var(--accent); margin-top: 2px; }

/* Channel-coloured tile accents */
.palette-tile.kick   { border-color: rgba(255, 107, 53, 0.4); }
.palette-tile.snare  { border-color: rgba(78, 205, 196, 0.4); }
.palette-tile.bass   { border-color: rgba(69, 183, 209, 0.4); }
.palette-tile.melody { border-color: rgba(167, 139, 250, 0.4); }

.palette-tile.kick .tile-icon   { color: var(--kick-color); }
.palette-tile.snare .tile-icon  { color: var(--snare-color); }
.palette-tile.bass .tile-icon   { color: var(--bass-color); }
.palette-tile.melody .tile-icon { color: var(--melody-color); }

/* Bounce-back animation when dropped on invalid target */
@keyframes returnBounce {
  0%   { transform: scale(0.9) translateY(4px); }
  50%  { transform: scale(1.05) translateY(-2px); }
  100% { transform: scale(1) translateY(0); }
}
.return-bounce { animation: returnBounce 0.35s ease-out; }

/* Snap animation when tile placed successfully */
@keyframes snapDrop {
  0%   { transform: scale(1.2); }
  70%  { transform: scale(0.95); }
  100% { transform: scale(1); }
}
.snap-drop { animation: snapDrop 0.3s ease-out; }

/* Hint pulse animation for Busker mode (misplaced tiles) */
@keyframes hintPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(245, 101, 101, 0.4); }
  50%  { box-shadow: 0 0 0 8px rgba(245, 101, 101, 0); }
}
.hint-pulse {
  animation: hintPulse 1.5s ease-in-out infinite;
  border-color: var(--incorrect-bdr) !important;
}

/* Cacophony shift animation */
@keyframes cacophonyShift {
  0%   { transform: scale(1); filter: hue-rotate(0deg); }
  25%  { transform: scale(1.1); filter: hue-rotate(90deg) brightness(1.3); }
  50%  { transform: scale(1.05); filter: hue-rotate(180deg); }
  75%  { transform: scale(1.08); filter: hue-rotate(270deg) brightness(1.2); }
  100% { transform: scale(1); filter: hue-rotate(360deg); }
}
.cacophony-shift {
  animation: cacophonyShift 0.5s ease-in-out;
}

/* ── Level select ─────────────────────────────────────────────── */
#level-select {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.level-select-inner {
  text-align: center;
  max-width: 480px;
  padding: 32px;
}
.level-select-inner h2 {
  margin-bottom: 20px;
  font-size: 1.4rem;
}
#level-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-bottom: 24px;
}
.level-btn {
  padding: 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  transition: background 0.15s, border-color 0.15s;
}
.level-btn.unlocked:hover {
  background: var(--surface);
  border-color: var(--accent);
}
.level-btn.locked {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── Toast ────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 20px;
  font-size: 0.85rem;
  color: var(--muted);
  z-index: 9000;
  pointer-events: none;
  animation: fadeInOut 4s ease forwards;
}
@keyframes fadeInOut {
  0%  { opacity: 0; transform: translateX(-50%) translateY(8px); }
  10% { opacity: 1; transform: translateX(-50%) translateY(0); }
  80% { opacity: 1; }
  100% { opacity: 0; }
}

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 480px) {
  .cell { height: 36px; font-size: 0.75rem; }
  .palette-tile { min-width: 52px; padding: 6px 8px; }
  .tile-icon { font-size: 1rem; }
}

@media (max-width: 340px) {
  .cell { height: 30px; font-size: 0.65rem; }
  #channel-labels { font-size: 0.6rem; }
}