:root {
  --bg: #070a12;
  --bg-soft: #0d1220;
  --card: rgba(20, 27, 45, 0.72);
  --card-border: rgba(120, 150, 220, 0.18);
  --text: #e8edf9;
  --text-dim: #8f9ec4;
  --accent: #31d8e4;
  --accent-2: #b45cff;
  --accent-3: #ff9f43;
  --danger: #f43f5e;
  --cell-gap: 2px;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(49, 216, 228, 0.14), transparent 60%),
    radial-gradient(1000px 700px at 95% 0%, rgba(180, 92, 255, 0.16), transparent 62%),
    radial-gradient(900px 700px at 50% 120%, rgba(255, 159, 67, 0.12), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  overflow-x: hidden;
  overscroll-behavior: none;
}

.app {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: clamp(10px, 2.2vw, 22px) clamp(10px, 2.4vw, 26px) 8px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: clamp(17px, 2.6vw, 22px);
  font-weight: 800;
  letter-spacing: 0.06em;
}

.logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: conic-gradient(from 210deg, var(--accent), var(--accent-2), var(--accent-3), var(--danger), var(--accent));
  box-shadow: 0 0 18px rgba(49, 216, 228, 0.45);
}

.topbar-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.ghost-btn {
  appearance: none;
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.12s ease;
}

.ghost-btn:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(140, 190, 255, 0.34);
}

.ghost-btn:active {
  transform: scale(0.96);
}

.ghost-btn[aria-pressed="false"] {
  opacity: 0.55;
}

.stage {
  display: grid;
  grid-template-columns: minmax(0, 150px) minmax(0, 1fr) minmax(0, 150px);
  gap: clamp(10px, 2vw, 20px);
  align-items: start;
  justify-content: center;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 12px;
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.34);
}

.card-title {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
}

kbd {
  display: inline-block;
  min-width: 18px;
  padding: 1px 5px;
  border-radius: 5px;
  border: 1px solid rgba(150, 175, 230, 0.35);
  border-bottom-width: 2px;
  background: rgba(255, 255, 255, 0.06);
  font-family: inherit;
  font-size: 11px;
  text-align: center;
  color: #c9d6f2;
}

.mini-canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  background: rgba(5, 8, 16, 0.62);
  box-shadow: inset 0 0 0 1px rgba(120, 150, 220, 0.12);
}

.stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 2px 2px 8px;
  border-bottom: 1px dashed rgba(140, 170, 225, 0.16);
}

.stat:last-child {
  border-bottom: 0;
  padding-bottom: 2px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-dim);
}

.stat-value {
  font-variant-numeric: tabular-nums;
  font-size: clamp(15px, 2vw, 19px);
  font-weight: 700;
  color: #fff;
  text-shadow: 0 0 14px rgba(49, 216, 228, 0.34);
  overflow-wrap: anywhere;
}

.board-wrap {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-width: 0;
}

.board-inner {
  position: relative;
  display: block;
  border-radius: 18px;
}

.board-canvas {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(11, 16, 28, 0.96), rgba(6, 9, 17, 0.98));
  border: 1px solid rgba(120, 160, 235, 0.22);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.5) inset,
    0 22px 60px rgba(0, 0, 0, 0.55),
    0 0 60px rgba(49, 216, 228, 0.08);
  touch-action: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px;
  border-radius: 18px;
  background: rgba(6, 9, 17, 0.72);
  backdrop-filter: blur(6px);
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

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

.overlay-card {
  width: min(100%, 300px);
  padding: 20px 18px;
  text-align: center;
  border-radius: 16px;
  border: 1px solid rgba(120, 160, 235, 0.26);
  background: linear-gradient(180deg, rgba(24, 33, 55, 0.94), rgba(12, 17, 30, 0.96));
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.5);
}

.overlay-kicker {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.overlay-title {
  margin: 0 0 8px;
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 800;
}

.overlay-text {
  margin: 0 0 14px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
}

.overlay-score {
  margin: 0 0 14px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(49, 216, 228, 0.09);
  border: 1px solid rgba(49, 216, 228, 0.26);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
}

.overlay-score strong {
  font-size: 20px;
  color: #fff;
  font-variant-numeric: tabular-nums;
}

.primary-btn {
  appearance: none;
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #04121a;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent), #8ff5c4 55%, var(--accent-2));
  box-shadow: 0 10px 26px rgba(49, 216, 228, 0.3);
  transition: transform 0.12s ease, box-shadow 0.18s ease, filter 0.18s ease;
}

.primary-btn:hover {
  filter: brightness(1.08);
}

.primary-btn:active {
  transform: translateY(1px) scale(0.99);
}

.keys-help ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 7px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-dim);
}

.touch-controls {
  display: none;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 0 clamp(4px, 2vw, 12px);
}

.tbtn {
  appearance: none;
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 14px 6px;
  font: inherit;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  transition: background 0.14s ease, transform 0.1s ease;
}

.tbtn:active,
.tbtn.is-active {
  background: rgba(49, 216, 228, 0.22);
  transform: scale(0.97);
}

.tbtn[data-action="hold"] {
  font-size: 12px;
  letter-spacing: 0.08em;
}

.footer {
  padding: 6px 4px 14px;
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(143, 158, 196, 0.7);
}

@media (max-width: 760px) {
  .stage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
    grid-template-areas:
      "board board"
      "left right";
  }
  .panel-left {
    grid-area: left;
  }
  .panel-right {
    grid-area: right;
  }
  .board-wrap {
    grid-area: board;
  }
  .panel-right .keys-help {
    display: none;
  }
  .stats {
    grid-template-columns: 1fr 1fr;
  }
  .board-canvas {
    max-width: min(100%, 340px);
  }
}

@media (max-width: 560px) {
  .stage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .card {
    padding: 10px;
    border-radius: 14px;
  }
  .touch-controls {
    display: grid;
  }
  .footer {
    padding-bottom: 6px;
  }
}

@media (hover: none) and (pointer: coarse) {
  .touch-controls {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
  }
}