:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --ink: #162034;
  --muted: #647089;
  --line: #d7e0ee;
  --panel: #ffffff;
  --brand: #156f83;
  --brand-2: #0b5465;
  --accent: #c55d2a;
  --good: #11835b;
  --warn: #8d6400;
  --shadow: 0 16px 38px rgba(25, 42, 70, 0.11);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(21, 111, 131, 0.10), transparent 28rem),
    linear-gradient(180deg, #f9fbfe 0%, var(--bg) 100%);
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.shell {
  width: min(1240px, calc(100% - 28px));
  margin: 0 auto;
  padding: 18px 0 28px;
}

.topbar,
.arena-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.compact-topbar { margin-bottom: 14px; }
.top-actions,
.head-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(28px, 4vw, 46px); line-height: 1.02; }
h2 { margin-bottom: 10px; font-size: 20px; }

.panel,
.closed-panel,
.battle-board,
.toast,
.status-pill {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.panel,
.closed-panel,
.battle-board { padding: 18px; }
.closed-panel { margin-bottom: 14px; }

.status-pill {
  padding: 10px 14px;
  color: var(--warn);
  font-weight: 800;
}
.status-pill.open { color: var(--good); }

.lobby-dashboard {
  display: grid;
  grid-template-columns: 1.1fr 0.86fr 0.96fr;
  grid-template-rows: auto auto;
  gap: 14px;
  align-items: start;
}
.join-panel { grid-column: 1 / 3; }
.daily-panel { grid-column: 3; grid-row: 1; }
.leaderboard-panel { grid-column: 1; grid-row: 2; }
.room-lobby-panel { grid-column: 2; grid-row: 2; }
.games-panel { grid-column: 3; grid-row: 2; }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}
.section-head span,
.hint,
.play-hint,
small {
  color: var(--muted);
  line-height: 1.45;
}

.quick-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr 0.95fr 92px;
  gap: 10px;
  align-items: end;
}
.join-button { min-height: 46px; }

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-weight: 700;
}
input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  background: #fbfdff;
  color: var(--ink);
  outline: none;
}
input:focus,
select:focus,
textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(21, 111, 131, 0.13);
}

.primary,
.ghost,
.link-button {
  min-height: 42px;
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0 14px;
  font-weight: 800;
}
.primary { background: var(--brand); color: #fff; }
.primary:hover { background: var(--brand-2); }
.ghost,
.link-button {
  background: #fff;
  color: var(--brand-2);
  border-color: var(--line);
  text-decoration: none;
  display: inline-grid;
  place-items: center;
}
.mini { min-height: 34px; padding: 0 10px; font-size: 13px; }
.wide { width: 100%; }
.hidden { display: none !important; }

.daily-panel strong {
  display: block;
  font-size: 18px;
  margin-bottom: 8px;
}
.daily-panel p { margin-bottom: 12px; color: var(--muted); }
.daily-question {
  display: grid;
  gap: 10px;
  margin-bottom: 12px;
}
.target-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  padding: 7px 12px;
  border-radius: 999px;
  background: #f7fbfe;
  border: 1px solid var(--line);
  color: var(--brand-2);
  font-weight: 900;
}
.target-pill strong { margin: 0; }
.mini-number-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}
.mini-number-row span {
  display: grid;
  place-items: center;
  min-height: 42px;
  border-radius: 8px;
  background: linear-gradient(180deg, #f8fbfe, #edf4fb);
  border: 1px solid var(--line);
  color: var(--brand-2);
  font-weight: 900;
}

.leaderboard-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}
.leaderboard-tabs button {
  min-height: 32px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  padding: 0 12px;
}
.leaderboard-tabs button.active {
  background: #edf7fb;
  border-color: #b7d4dd;
  color: var(--brand-2);
}

.leaderboard-list,
.rooms-list,
.public-room-list,
.battle-log {
  display: grid;
  gap: 8px;
}
.leader-row,
.room-item,
.public-room,
.log-line,
.empty-state {
  display: grid;
  grid-template-columns: 30px 1fr auto auto;
  gap: 10px;
  align-items: center;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #fff, #f8fbfe);
}
.public-room {
  grid-template-columns: 1fr auto;
}
.public-room strong,
.public-room span {
  display: block;
}
.public-room span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}
.leader-row em { color: var(--muted); font-style: normal; font-size: 12px; }
.leader-row strong { color: var(--accent); }
.empty-state {
  grid-template-columns: 1fr;
  color: var(--muted);
}

.game-list {
  display: grid;
  gap: 10px;
}
.compact-games { grid-template-columns: 1fr; }
.game-card {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, #fff, #f8fbfe);
}
.game-card.disabled { opacity: 0.58; }
.game-card strong { display: block; margin-bottom: 4px; }
.game-card span { color: var(--brand); font-size: 12px; font-weight: 800; }
.game-card p { margin: 4px 0 0; color: var(--muted); font-size: 13px; line-height: 1.45; }
.game-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(180deg, #edf7fb, #dff0f5);
  color: var(--brand-2);
  font-size: 20px;
  font-weight: 900;
}

.arena {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 14px;
}
.arena-head,
.players { grid-column: 1 / -1; }
.players {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 10px;
}
.player-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 14px;
}
.player-card.me { border-color: rgba(21, 111, 131, 0.4); }
.player-card.turn { box-shadow: 0 0 0 3px rgba(21, 111, 131, 0.10); }
.player-card strong { display: block; font-size: 16px; margin-bottom: 4px; }
.player-card span { color: var(--muted); font-size: 12px; }
.player-score { color: var(--accent); font-size: 28px; font-weight: 900; }
.presence-line {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.presence-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  background: #b9c3d0;
}
.presence-dot.online { background: #16a36a; }
.presence-dot.offline { background: #d44b3d; }

.round-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  color: var(--muted);
}
.round-info strong { color: var(--accent); font-size: 26px; }
.game-surface { display: grid; gap: 12px; }

.target-line {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}
.target-line strong {
  color: var(--brand-2);
  font-size: 24px;
}

.number-row {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}
.number-row:has(.number-tile:nth-child(4):last-child) {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.number-tile {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border-radius: 8px;
  border: 1px solid #c8d4e2;
  background: linear-gradient(180deg, #f7fbff, #edf4fb);
  color: var(--brand-2);
  font-size: clamp(28px, 5vw, 54px);
  font-weight: 900;
}
.clickable-numbers .number-tile {
  min-height: clamp(76px, 16vh, 132px);
}
.number-tile:disabled,
.memory-card:disabled,
.sudoku-cell:disabled {
  cursor: default;
}
.number-tile:disabled {
  opacity: 0.42;
}
.answer-form {
  display: grid;
  grid-template-columns: 1fr 108px;
  gap: 10px;
}
.formula-display {
  min-height: 42px;
  display: flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fbfdff;
  color: var(--brand-2);
  font-size: 18px;
  font-weight: 900;
}
.formula-pad {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 8px;
}
.formula-pad button {
  min-height: 38px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  font-weight: 900;
}
.formula-pad .primary {
  background: var(--brand);
  color: #fff;
  border-color: transparent;
}

.memory-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  max-width: 620px;
}
.memory-card {
  min-height: clamp(72px, 12vh, 100px);
  border-radius: 8px;
  border: 1px solid #c6d4e1;
  background: linear-gradient(180deg, #fdfefe, #eef4fb);
  color: var(--brand-2);
  font-size: 28px;
  font-weight: 900;
}
.memory-card.revealed { background: linear-gradient(180deg, #fffef7, #f3efe0); }
.memory-card.matched { background: linear-gradient(180deg, #eefaf4, #daf2e5); }

.maze-wrap { display: grid; gap: 12px; }
.maze-grid {
  display: grid;
  grid-template-columns: repeat(var(--maze-size), minmax(0, 1fr));
  gap: 4px;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #f6f9fc;
}
.maze-cell {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 4px;
}
.maze-cell.wall { background: #203045; }
.maze-cell.path { background: #edf4fb; }
.maze-cell.start { box-shadow: inset 0 0 0 2px rgba(17, 131, 91, 0.45); }
.maze-cell.end { box-shadow: inset 0 0 0 2px rgba(197, 93, 42, 0.55); }
.runner {
  width: 72%;
  height: 72%;
  border-radius: 50%;
  background: linear-gradient(180deg, #ffb37a, #c55d2a);
}
.runner.me { background: linear-gradient(180deg, #78d0e1, #156f83); }
.pad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.pad button {
  min-height: 44px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
}
.pad button:nth-child(1) { grid-column: 2; }
.pad button:nth-child(2) { grid-column: 1; grid-row: 2; }
.pad button:nth-child(3) { grid-column: 2; grid-row: 2; }
.pad button:nth-child(4) { grid-column: 3; grid-row: 2; }

.sudoku-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}
.sudoku-cell {
  min-height: 64px;
  border-radius: 8px;
  border: 1px solid #dbe4f0;
  background: #fff;
  font-size: 24px;
  font-weight: 900;
  color: var(--ink);
}
.sudoku-cell.fixed {
  background: linear-gradient(180deg, #eef4fb, #e7eef7);
  color: var(--brand-2);
}
.sudoku-cell.selected {
  box-shadow: 0 0 0 3px rgba(21, 111, 131, 0.12);
}
.digit-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.input-pad-label {
  width: fit-content;
  padding: 6px 10px;
  border-radius: 999px;
  background: #e8f6f8;
  color: var(--brand-2);
  font-size: 12px;
  font-weight: 900;
}
.digit-pad {
  padding: 12px;
  border-radius: 8px;
  border: 1px solid #b9d9e1;
  background: linear-gradient(180deg, #edf9fb, #dceff5);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.8);
}
.digit-row button {
  min-height: 56px;
  border-radius: 8px;
  border: 1px solid #8fc2ce;
  background: linear-gradient(180deg, #ffffff, #d8f1f6);
  color: var(--brand-2);
  font-size: 22px;
  font-weight: 950;
  box-shadow: 0 5px 0 #91c5cf, 0 12px 22px rgba(21, 111, 131, 0.14);
}
.digit-row button:hover {
  transform: translateY(-1px);
}
.digit-row button:active {
  transform: translateY(3px);
  box-shadow: 0 2px 0 #91c5cf, 0 8px 16px rgba(21, 111, 131, 0.12);
}

.hanzi-stage {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 12px;
}
.hanzi-target,
.hanzi-clue,
.compose-box {
  border-radius: 8px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #fff, #f7fbfe);
  padding: 14px;
}
.hanzi-target {
  display: grid;
  place-items: center;
  gap: 4px;
}
.hanzi-target span,
.hanzi-target em,
.hanzi-clue b {
  color: var(--muted);
  font-size: 12px;
  font-style: normal;
}
.hanzi-target strong {
  font-size: 72px;
  line-height: 1;
  color: var(--brand-2);
}
.hanzi-clue p {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 800;
}
.compose-box {
  min-height: 58px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-weight: 900;
}
.compose-box span {
  min-width: 44px;
  min-height: 44px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: #e8f6f8;
  color: var(--brand-2);
  border: 1px solid #a7d2da;
  font-size: 24px;
}
.hanzi-options {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}
.hanzi-options button {
  min-height: 54px;
  border-radius: 8px;
  border: 1px solid #9bcbd5;
  background: linear-gradient(180deg, #fff, #e9f7fa);
  color: var(--brand-2);
  font-size: 22px;
  font-weight: 950;
  box-shadow: 0 4px 0 #a7d2da;
}
.hanzi-actions {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.spot-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.spot-panel > span {
  display: inline-block;
  margin-bottom: 6px;
  color: var(--muted);
  font-weight: 900;
}
.spot-canvas {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid #c7d6e4;
  background:
    linear-gradient(90deg, rgba(21,111,131,0.05) 1px, transparent 1px),
    linear-gradient(rgba(21,111,131,0.05) 1px, transparent 1px),
    #f8fbff;
  background-size: 20px 20px;
}
.spot-shape {
  position: absolute;
  width: var(--s);
  height: var(--s);
  left: var(--x, 0);
  top: var(--y, 0);
  transform: translate(-50%, -50%) rotate(var(--r));
  background: var(--c);
  box-shadow: 0 6px 12px rgba(19, 36, 53, 0.12);
}
.spot-shape.circle { border-radius: 50%; }
.spot-shape.square { border-radius: 6px; }
.spot-shape.diamond { border-radius: 5px; transform: translate(-50%, -50%) rotate(45deg); }
.spot-shape.triangle {
  width: 0;
  height: 0;
  background: transparent;
  border-left: calc(var(--s) / 2) solid transparent;
  border-right: calc(var(--s) / 2) solid transparent;
  border-bottom: var(--s) solid var(--c);
  box-shadow: none;
}
.spot-shape.pill { border-radius: 999px; width: calc(var(--s) * 1.45); }
.spot-shape.star {
  clip-path: polygon(50% 0, 61% 35%, 98% 35%, 68% 56%, 79% 92%, 50% 70%, 21% 92%, 32% 56%, 2% 35%, 39% 35%);
}
.diff-hotspot {
  position: absolute;
  width: 14%;
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 2px solid rgba(197, 93, 42, 0.0);
  background: rgba(197, 93, 42, 0.0);
}
.diff-hotspot:hover {
  border-color: rgba(197, 93, 42, 0.5);
  background: rgba(197, 93, 42, 0.08);
}
.diff-hotspot.found {
  border-color: rgba(22, 163, 106, 0.85);
  background: rgba(22, 163, 106, 0.14);
}

.battle-log {
  max-height: 440px;
  overflow: auto;
}
.log-line {
  grid-template-columns: 1fr;
  color: var(--muted);
}

.admin-console {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 0.95fr;
  gap: 14px;
  align-items: start;
}
.control-panel { display: grid; gap: 12px; }
.stats-panel,
.rooms-panel,
.admin-leader-panel,
.security-panel { min-height: 100%; }
.security-panel {
  grid-column: 2 / 4;
  display: grid;
  gap: 12px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}
.metric-grid div {
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #fff, #f8fbfe);
}
.metric-grid span {
  display: block;
  color: var(--muted);
  margin-bottom: 4px;
}
.metric-grid strong {
  font-size: 28px;
}

.toggle-card {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #fff, #f8fbfe);
}
.toggle-card input {
  position: absolute;
  opacity: 0;
}
.toggle-track {
  position: relative;
  width: 44px;
  height: 24px;
  border-radius: 999px;
  background: #d7e0ee;
  border: 1px solid #c7d3e2;
}
.toggle-track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.16);
  transition: transform 0.2s ease;
}
.toggle-card input:checked + .toggle-track {
  background: linear-gradient(180deg, #64bfd0, #156f83);
}
.toggle-card input:checked + .toggle-track::after {
  transform: translateX(20px);
}
.toggle-card strong { display: block; color: var(--ink); }
.admin-game-list { display: grid; gap: 8px; }

.in-game .shell {
  padding-top: 10px;
}
.in-game h1 {
  font-size: clamp(24px, 3vw, 34px);
}
.in-game .compact-topbar {
  margin-bottom: 8px;
}
.in-game .players {
  gap: 8px;
}
.in-game .player-card {
  padding: 10px 12px;
}
.in-game .battle-board,
.in-game .panel {
  padding: 14px;
}
.in-game .arena {
  gap: 10px;
}
.in-game .round-info {
  margin-bottom: 10px;
}
.in-game .battle-log {
  max-height: 340px;
}

.room-item {
  grid-template-columns: 1fr auto;
}
.room-item header,
.room-players {
  grid-column: 1 / -1;
}
.room-players { color: var(--muted); }

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  max-width: min(420px, calc(100% - 36px));
  padding: 14px 16px;
}

@media (max-width: 1120px) {
  .lobby-dashboard,
  .admin-console,
  .arena {
    grid-template-columns: 1fr;
  }
  .join-panel,
  .daily-panel,
  .leaderboard-panel,
  .room-lobby-panel,
  .games-panel {
    grid-column: auto;
    grid-row: auto;
  }
}

@media (max-width: 760px) {
  .shell {
    width: min(100% - 18px, 1240px);
    padding-top: 14px;
  }
  .topbar,
  .arena-head {
    flex-direction: column;
    align-items: flex-start;
  }
  .quick-grid,
  .compact-games,
  .answer-form,
  .formula-pad,
  .metric-grid {
    grid-template-columns: 1fr;
  }
  .leader-row {
    grid-template-columns: 24px 1fr auto;
  }
  .leader-row em { display: none; }
}