@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Orbitron:wght@400;700;900&display=swap');

:root {
  --bg-deep:        #0a0a0f;
  --bg-mid:         #0f0f1a;
  --bg-panel:       #13131f;
  --border:         #1e1e3a;
  --border-bright:  #2e2e5a;
  --accent:         #00f0ff;
  --accent-dim:     #00a8b5;
  --accent-glow:    rgba(0, 240, 255, 0.18);
  --accent2:        #ff2d6b;
  --accent2-glow:   rgba(255, 45, 107, 0.18);
  --text:           #c8d0e8;
  --text-dim:       #5a6080;
  --text-bright:    #eef2ff;

  /* Tetromino colors */
  --I: #00f0ff;
  --O: #f0e000;
  --T: #c000f0;
  --S: #00f060;
  --Z: #f02000;
  --J: #0060f0;
  --L: #f08000;
}

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

html, body {
  height: 100%;
}

body {
  background-color: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0,240,255,0.07) 0%, transparent 70%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-mid) 100%);
  font-family: 'Share Tech Mono', monospace;
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  overflow-x: hidden;
}

/* ─── HEADER ─────────────────────────────────────────── */
header {
  width: 100%;
  padding: 28px 40px 0;
  display: flex;
  align-items: baseline;
  gap: 16px;
  user-select: none;
}

.logo {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: 2rem;
  letter-spacing: 0.18em;
  color: var(--text-bright);
  text-shadow: 0 0 18px var(--accent), 0 0 40px rgba(0,240,255,0.25);
}

.logo span {
  color: var(--accent);
}

.logo-sub {
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* ─── MAIN LAYOUT ────────────────────────────────────── */
.game-wrapper {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 32px 40px 40px;
  width: 100%;
  max-width: 1100px;
}

/* ─── CANVAS CONTAINER ───────────────────────────────── */
.canvas-container {
  position: relative;
  flex-shrink: 0;
}

#game-canvas {
  display: block;
  border: 1px solid var(--border-bright);
  box-shadow:
    0 0 0 1px var(--border),
    0 0 30px rgba(0,240,255,0.08),
    0 0 80px rgba(0,240,255,0.04),
    inset 0 0 40px rgba(0,0,0,0.6);
  background: #08080f;
}

/* scanline overlay */
.canvas-container::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.08) 2px,
    rgba(0,0,0,0.08) 4px
  );
  pointer-events: none;
}

/* overlay screens */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(8, 8, 15, 0.88);
  backdrop-filter: blur(2px);
  z-index: 10;
  gap: 20px;
  transition: opacity 0.3s ease;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.overlay-title {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: 1.6rem;
  letter-spacing: 0.2em;
  color: var(--text-bright);
  text-shadow: 0 0 20px var(--accent);
}

.overlay-sub {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--text-dim);
}

/* ─── SIDE PANEL ─────────────────────────────────────── */
.side-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  flex: 1;
  min-width: 0;
}

.side-panel .panel-block:nth-child(n + 5),
.side-panel .btn-imprint {
  grid-column: 1 / -1;
}

.panel-block {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  padding: 18px 20px;
  position: relative;
}

.panel-block::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
  opacity: 0.5;
}

.panel-label {
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.panel-value {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--accent);
  text-shadow: 0 0 12px var(--accent-glow);
  letter-spacing: 0.08em;
  line-height: 1;
}

.panel-value.level {
  color: var(--accent2);
  text-shadow: 0 0 12px var(--accent2-glow);
}

/* next piece canvas */
#next-canvas {
  display: block;
  margin-top: 4px;
}

/* ─── BUTTONS ────────────────────────────────────────── */
.btn {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  border: 1px solid var(--border-bright);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  padding: 12px 16px;
  width: 100%;
  position: relative;
  transition: color 0.2s, border-color 0.2s, box-shadow 0.2s;
  text-align: center;
  text-decoration: none;
  display: block;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.2s;
}

.btn:hover {
  color: var(--text-bright);
  border-color: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow), inset 0 0 14px var(--accent-glow);
}

.btn.btn-primary {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.btn.btn-primary:hover {
  color: var(--bg-deep);
  background: var(--accent);
  box-shadow: 0 0 24px var(--accent), 0 0 48px var(--accent-glow);
}

.btn.btn-danger {
  border-color: var(--accent2);
  color: var(--accent2);
  box-shadow: 0 0 8px var(--accent2-glow);
}

.btn.btn-danger:hover {
  color: var(--text-bright);
  border-color: var(--accent2);
  box-shadow: 0 0 20px var(--accent2-glow);
}

.btn.btn-music {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 16px;
}

.btn.btn-music .music-icon {
  font-size: 1rem;
  line-height: 1;
}

.btn.active-music {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
  animation: pulse-music 2s ease-in-out infinite;
}

@keyframes pulse-music {
  0%, 100% { box-shadow: 0 0 8px var(--accent-glow); }
  50%       { box-shadow: 0 0 20px rgba(0,240,255,0.35); }
}

.btn.btn-imprint {
  font-size: 0.58rem;
  color: var(--text-dim);
  border-color: var(--border);
  margin-top: auto;
}

.btn.btn-imprint:hover {
  color: var(--text);
  border-color: var(--border-bright);
  box-shadow: none;
}

/* ─── CONTROLS LEGEND ────────────────────────────────── */
.controls-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 5px 12px;
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-top: 4px;
}

.controls-grid .key {
  color: var(--accent-dim);
  letter-spacing: 0.05em;
}

/* ─── GAME OVER SCORE ────────────────────────────────── */
.overlay-score {
  font-family: 'Orbitron', sans-serif;
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}

/* ─── FOOTER ─────────────────────────────────────────── */
footer {
  padding: 0 40px 24px;
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.15em;
  width: 100%;
  max-width: 1100px;
}

/* ─── RESPONSIVE ─────────────────────────────────────── */
@media (max-width: 620px) {
  header { padding: 20px 16px 0; }
  .game-wrapper { flex-direction: column; padding: 20px 16px 32px; gap: 16px; }
  .side-panel { flex-direction: row; flex-wrap: wrap; }
  .panel-block { flex: 1; min-width: 120px; }
  footer { padding: 0 16px 20px; }
}