@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Space+Mono:wght@400;700&display=swap');

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --surface-raised: #1a1a1a;
  --border: #2a2a2a;
  --accent: #e8ff00;
  --accent-glow: rgba(232, 255, 0, 0.25);
  --accent-dim: rgba(232, 255, 0, 0.08);
  --text-primary: #f0f0f0;
  --text-muted: #b1b0b0;
  --danger: #ff3b3b;
}

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

html {
  font-size: 10px;
  background: var(--bg);
  min-height: 100vh;
}

body {
  font-family: 'Space Mono', monospace;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(232,255,0,0.07) 0%, transparent 60%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 39px,
      rgba(255,255,255,0.015) 39px,
      rgba(255,255,255,0.015) 40px
    ),
    var(--bg);
}

body::before {
  content: 'DRUM KIT';
  font-family: 'Bebas Neue', sans-serif;
  font-size: 8rem;
  letter-spacing: 0.2em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(232,255,0,0.15);
  position: fixed;
  top: -1rem;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

.keys {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.2rem;
  padding: 8rem 4rem 4rem;
  width: fit-content;
}

.key {
  appearance: none;
  position: relative;
  min-width: 10rem;
  width: fit-content;
  padding: 2rem 1rem 1.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.06s ease, border-color 0.06s ease, box-shadow 0.06s ease, background 0.06s ease;
  overflow: hidden;
  font-family: inherit;
}

.key::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
}

.key::after {
  content: '';
  position: absolute;
  top: 6px;
  right: 6px;
  width: 5px;
  height: 5px;
  border-top: 1px solid var(--text-muted);
  border-right: 1px solid var(--text-muted);
  transition: border-color 0.06s ease;
}

.key:hover {
  border-color: #404040;
  background: var(--surface-raised);
}

.key:hover::after {
  border-color: var(--accent);
}

.playing {
  transform: scale(1.08) translateY(-2px);
  border-color: var(--accent) !important;
  background: var(--accent-dim) !important;
  box-shadow:
    0 0 0 1px var(--accent),
    0 0 20px var(--accent-glow),
    0 8px 32px rgba(0,0,0,0.6);
}

.playing::after {
  border-color: var(--accent) !important;
}

.key kbd {
  display: block;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 4.8rem;
  line-height: 1;
  color: var(--text-primary);
  letter-spacing: 0.05em;
  margin-bottom: 0.8rem;
  transition: color 0.06s ease;
}

.playing kbd {
  color: var(--accent);
}

.sound {
  display: block;
  font-family: 'Space Mono', monospace;
  font-size: 1.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  transition: color 0.06s ease;
}

.playing .sound {
  color: var(--accent);
}

#controls {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.control-board {
  display: flex;
  flex-direction: column;
  font-size: 2rem;
  margin: 20px;
  padding: 2rem 1rem 1.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  text-align: center;
}

.control-btns {
  display: flex;
  gap: 20px;
  margin: 20px;
}

.control-btn {
  appearance: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  width: fit-content;
  min-width: 100px;
  padding: 2rem 1.5rem 1.6rem;
  background: #fdfdfd;
  border: 1px solid #d1d1d1;
  border-radius: 4px;
  text-align: center;
  transition: transform 0.06s ease, border-color 0.06s ease, background 0.06s ease;
  position: relative;
  overflow: hidden;
  user-select: none;
  font-family: inherit;
}

.control-btn:active {
  transform: scale(0.95);
  background: #f0f0f0;
}

.control-btn.paused {
  border-color: var(--danger);
  background: #fffafa;
}

.control-btn kbd {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 2.4rem;
  color: #1a1a1a;
  margin-bottom: 0.5rem;
}

.control-btn .sound {
  color: #777;
  font-size: 0.9rem;
}

.control-btn::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,0,0,0.05), transparent);
}

.control-btn::after {
  content: '';
  position: absolute;
  top: 6px;
  right: 6px;
  width: 5px;
  height: 5px;
  border-top: 1px solid #999;
  border-right: 1px solid #999;
}

.control-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: #ffffff;
}

.control-btn:hover:not(:disabled)::after {
  border-color: var(--accent);
}

#progress-bar {
  width: 1000px;
  height: 12px;
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
}

.bar-segment {
  flex: 1;
  background-color: #eaff0056;
  border-radius: 2px;
  transition: background-color 0.1s ease, transform 0.1s ease;
}

.bar-segment.active {
  background-color: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
  transform: scaleY(1.5);
  filter: brightness(1.2);
}

#beat-counter {
  font-family: 'Space Mono', monospace;
  color: var(--accent);
  font-size: 1.4rem;
  margin-top: 1rem;
  letter-spacing: 2px;
}

#big-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

#beats-selected {
  width: 100%;
  max-width: 860px;
  padding: 0 4rem 2rem;
}

#beats-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

#beats-list li {
  font-size: 1rem;
  padding: 0.4rem 1rem;
  background: var(--accent-dim);
  border: 1px solid rgba(232,255,0,0.2);
  border-radius: 2px;
  color: var(--accent);
}

.control-btn.disabled, .control-btn:disabled {
  opacity: 0.3;
  filter: grayscale(0.8);
  pointer-events: none;
  cursor: not-allowed;
  transform: none !important;
}

.control-btn.disabled kbd,
.control-btn.disabled .sound,
.control-btn:disabled kbd,
.control-btn:disabled .sound {
  color: #aaa !important;
}

#create-btn {
appearance: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  width: fit-content;
  min-width: 100px;
  padding: 2rem 1.5rem 1.6rem;
  background: #fdfdfd;
  border: 1px solid #d1d1d1;
  border-radius: 4px;
  text-align: center;
  transition: transform 0.06s ease, border-color 0.06s ease, background 0.06s ease;
  position: relative;
  overflow: hidden;
  user-select: none;
  font-family: inherit;
}