:root {
  --bg: #07111f;
  --panel: rgba(13, 24, 41, 0.86);
  --panel-strong: rgba(19, 34, 57, 0.96);
  --line: rgba(183, 214, 255, 0.18);
  --text: #f5f8ff;
  --muted: #aab8cf;
  --cyan: #47d7ff;
  --lime: #a7f05a;
  --mint: #5ff0c8;
  --rose: #ff6b9e;
  --gold: #ffd166;
  --shadow: 0 18px 54px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  min-height: 100%;
  margin: 0;
  overflow-x: hidden;
  overscroll-behavior: none;
}

body {
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans TC", sans-serif;
  background:
    radial-gradient(circle at 12% 18%, rgba(95, 240, 200, 0.2), transparent 24rem),
    radial-gradient(circle at 82% 8%, rgba(255, 209, 102, 0.13), transparent 20rem),
    linear-gradient(160deg, #050911 0%, #07151b 50%, #101827 100%);
}

button,
input {
  font: inherit;
}

button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
  touch-action: manipulation;
}

button:active {
  transform: translateY(1px);
}

.shell {
  width: min(100%, 980px);
  min-height: 100dvh;
  margin: 0 auto;
  padding: max(4px, env(safe-area-inset-top)) 7px calc(88px + env(safe-area-inset-bottom));
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 8;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 92px;
  grid-template-areas:
    "brand brand"
    "actions mode";
  gap: 4px;
  padding: 4px 0 6px;
  background: linear-gradient(180deg, rgba(7, 17, 31, 0.98), rgba(7, 17, 31, 0.72));
  backdrop-filter: blur(18px);
}

.brand {
  grid-area: brand;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.eyebrow {
  margin: 0 0 2px;
  color: var(--cyan);
  font-size: 0.52rem;
  font-weight: 900;
}

h1 {
  margin: 0;
  font-size: clamp(1.08rem, 5vw, 2.5rem);
  line-height: 1;
  letter-spacing: 0;
}

.status-pill {
  flex: 0 0 auto;
  max-width: 42vw;
  padding: 4px 6px;
  border: 1px solid rgba(183, 214, 255, 0.18);
  border-radius: 8px;
  color: rgba(245, 248, 255, 0.76);
  background: rgba(255, 255, 255, 0.07);
  font-size: 0.6rem;
  font-weight: 800;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.top-actions {
  grid-area: actions;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 4px;
}

.top-actions button {
  min-height: 30px;
  font-size: 0.72rem;
}

.mode-switch {
  grid-area: mode;
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
}

.mode-button {
  min-height: 24px;
  border: 0;
  background: transparent;
  font-size: 0.62rem;
}

.mode-button.active {
  color: #07111f;
  background: var(--cyan);
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(98px, 29vw) minmax(0, 1fr);
  gap: 6px;
  align-items: start;
}

.mode-solo .game-layout {
  grid-template-columns: minmax(108px, 32vw) minmax(0, 1fr);
}

.mode-duel .game-layout {
  grid-template-columns: minmax(132px, 40vw) minmax(0, 1fr);
}

.board-zone,
.side-panel,
.touch-controls {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.board-zone {
  display: grid;
  place-items: center;
  padding: 7px;
}

.board-frame {
  position: relative;
  width: min(100%, calc((100dvh - 188px - env(safe-area-inset-bottom)) / 2), 310px);
  aspect-ratio: 10 / 20;
}

.board,
.opponent-board,
.mini-board {
  display: grid;
  background:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    rgba(2, 7, 15, 0.88);
  background-size: 10% 5%, 10% 5%, auto;
}

.board {
  width: 100%;
  height: 100%;
  grid-template-columns: repeat(10, 1fr);
  grid-template-rows: repeat(20, 1fr);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  overflow: hidden;
  touch-action: none;
}

.cell {
  border: 1px solid rgba(255, 255, 255, 0.045);
}

.filled {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.42),
    inset 0 -8px 14px rgba(0, 0, 0, 0.18),
    0 0 14px color-mix(in srgb, var(--piece-color) 42%, transparent);
  background: var(--piece-color);
}

.ghost {
  background: color-mix(in srgb, var(--piece-color) 26%, transparent);
  border-color: color-mix(in srgb, var(--piece-color) 34%, transparent);
}

.game-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 7px;
  padding: 18px;
  text-align: center;
  background: rgba(4, 9, 18, 0.66);
}

.game-overlay.hidden {
  display: none;
}

.game-overlay strong {
  font-size: 1.35rem;
}

.game-overlay span {
  color: var(--muted);
  font-size: 0.84rem;
}

.side-panel {
  display: grid;
  gap: 4px;
  padding: 4px;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
}

.stat-card,
.preview-card,
.duel-panel,
.rules-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
}

.stat-card {
  min-height: 30px;
  padding: 4px;
}

.stat-card span,
.preview-card span,
.rules-panel span,
.duel-header span,
.room-input span {
  display: block;
  color: var(--muted);
  font-size: 0.54rem;
}

.stat-card strong {
  display: block;
  margin-top: 1px;
  font-size: clamp(0.68rem, 2.6vw, 0.92rem);
  line-height: 1.05;
}

.preview-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 36px;
  align-items: center;
  gap: 4px;
  padding: 4px;
}

.mode-solo .piece-card {
  grid-template-columns: minmax(0, 1fr) 46px;
  min-height: 54px;
  padding: 6px;
}

.rules-panel {
  display: grid;
  gap: 4px;
  padding: 4px;
}

.panel-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.panel-title strong {
  color: rgba(245, 248, 255, 0.82);
  font-size: 0.62rem;
}

.mode-solo .solo-tools {
  gap: 6px;
  padding: 6px;
}

.rules-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 3px;
}

.rule-button {
  min-height: 24px;
  padding: 0 2px;
  font-size: 0.52rem;
  line-height: 1;
  overflow-wrap: anywhere;
}

.mode-solo .rule-button {
  min-height: 34px;
  padding: 0 4px;
  font-size: 0.62rem;
  font-weight: 850;
}

.rule-button.active {
  color: #051611;
  background: linear-gradient(135deg, var(--mint), var(--gold));
}

.hold-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 36px;
  gap: 4px;
  align-items: center;
}

.mode-solo .hold-card {
  grid-template-columns: minmax(0, 1fr) 44px;
  padding: 5px;
  border: 1px solid rgba(183, 214, 255, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
}

.hold-card button {
  min-height: 26px;
  font-size: 0.62rem;
  grid-column: 1 / -1;
}

.mode-solo .hold-card button {
  min-height: 34px;
  font-size: 0.72rem;
  font-weight: 850;
}

.hold-card button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.rules-panel small {
  color: var(--muted);
  font-size: 0.56rem;
  line-height: 1.2;
}

.rule-guide {
  display: none;
  gap: 3px;
  color: var(--muted);
  font-size: 0.55rem;
  line-height: 1.18;
}

.rule-guide span {
  display: block;
}

.rule-guide strong {
  color: rgba(245, 248, 255, 0.82);
}

.preview-card strong {
  display: block;
  margin-top: 2px;
  font-size: 0.76rem;
}

.mini-board {
  width: min(100%, 36px);
  aspect-ratio: 1;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  border-radius: 6px;
  overflow: hidden;
}

.mode-solo .mini-board {
  width: min(100%, 44px);
}

.duel-panel {
  display: grid;
  gap: 4px;
  padding: 4px;
}

.mode-solo .duel-panel {
  display: none !important;
}

.duel-header {
  display: grid;
  gap: 2px;
}

.duel-header strong {
  font-size: 0.72rem;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.duel-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
}

.duel-meta span {
  display: grid;
  gap: 1px;
  min-height: 30px;
  padding: 4px;
  border: 1px solid rgba(183, 214, 255, 0.12);
  border-radius: 7px;
  color: var(--muted);
  font-size: 0.52rem;
  background: rgba(255, 255, 255, 0.04);
}

.duel-meta strong {
  color: var(--text);
  font-size: 0.68rem;
}

.room-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
}

.room-actions button {
  min-height: 26px;
  padding: 0 4px;
  font-size: 0.6rem;
}

.room-input {
  display: grid;
  gap: 3px;
}

.room-input input {
  min-height: 26px;
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: rgba(0, 0, 0, 0.22);
  padding: 0 6px;
  font-size: 0.62rem;
}

.opponent-board {
  width: min(100%, 58px);
  aspect-ratio: 10 / 20;
  grid-template-columns: repeat(10, 1fr);
  grid-template-rows: repeat(20, 1fr);
  border-radius: 6px;
  overflow: hidden;
}

.mode-duel .opponent-board {
  width: min(100%, 128px);
  justify-self: center;
}

.mode-duel .rules-panel {
  display: none;
}

.mode-duel .piece-card {
  order: 3;
}

.mode-duel .duel-panel {
  order: 2;
  display: grid;
}

.rule-classic .hold-card {
  display: none;
}

kbd {
  display: inline-grid;
  place-items: center;
  min-width: 1.35em;
  min-height: 1.35em;
  margin-left: 3px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 4px;
  color: rgba(245, 248, 255, 0.86);
  background: rgba(0, 0, 0, 0.22);
  font-size: 0.68em;
  font-weight: 900;
}

.primary {
  color: #07111f;
  font-weight: 900;
  background: linear-gradient(135deg, var(--cyan), var(--lime));
}

.touch-controls {
  position: fixed;
  left: 8px;
  right: 8px;
  bottom: max(8px, env(safe-area-inset-bottom));
  z-index: 10;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  width: min(calc(100% - 16px), 620px);
  margin: 0 auto;
  padding: 8px;
}

.touch-controls button {
  min-height: 56px;
  font-size: 1.45rem;
  font-weight: 900;
  background: rgba(255, 255, 255, 0.12);
}

.touch-controls .hard-drop {
  color: rgba(255, 253, 247, 0.84);
  font-size: 1.78rem;
  background: linear-gradient(135deg, var(--rose), var(--gold));
}

.touch-controls .rotate-button {
  color: rgba(245, 248, 255, 0.84);
  background: linear-gradient(135deg, #47d7ff, #6b8cff);
}

@media (min-width: 600px) {
  .shell {
    padding: 12px 14px calc(96px + env(safe-area-inset-bottom));
  }

  .topbar {
    grid-template-columns: 1fr 260px 148px;
    grid-template-areas: "brand actions mode";
    align-items: end;
  }

  .game-layout {
    grid-template-columns: 150px minmax(320px, 1fr);
    gap: 10px;
  }

  .mode-solo .game-layout {
    grid-template-columns: 170px minmax(320px, 1fr);
  }

  .mode-duel .game-layout {
    grid-template-columns: 220px minmax(320px, 1fr);
  }

  .board-zone {
    padding: 10px;
  }

  .board-frame {
    width: min(100%, calc((100dvh - 156px - env(safe-area-inset-bottom)) / 2), 390px);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .mini-board {
    width: 48px;
  }

  .opponent-board {
    width: 82px;
  }

  .mode-duel .opponent-board {
    width: 156px;
  }
}

@media (min-width: 920px) {
  .topbar {
    grid-template-columns: 1fr 300px 160px;
  }

  .game-layout {
    grid-template-columns: 190px minmax(360px, 1fr);
    justify-content: center;
  }

  .mode-solo .game-layout {
    grid-template-columns: 210px minmax(360px, 1fr);
  }

  .mode-duel .game-layout {
    grid-template-columns: 260px minmax(360px, 1fr);
  }

  .board-frame {
    width: min(100%, calc((100dvh - 156px - env(safe-area-inset-bottom)) / 2), 430px);
  }

  .touch-controls {
    width: 620px;
  }
}