:root {
  --bg: #f5f7fb;
  --ink: #172033;
  --muted: #637083;
  --panel: #ffffff;
  --line: #d7e0ea;
  --soft: #eef3f8;
  --accent: #287c71;
  --accent-strong: #15635a;
  --warning: #d99a24;
  --danger: #b42318;
  --blue: #2563eb;
  --orange: #ea7a24;
  --shadow: 0 18px 44px rgba(31, 44, 63, 0.14);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "Noto Sans KR", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(140deg, rgba(40, 124, 113, 0.11), transparent 34%),
    linear-gradient(48deg, rgba(216, 74, 43, 0.08), transparent 42%),
    var(--bg);
  color: var(--ink);
}

button {
  font: inherit;
}

.app {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: minmax(300px, 680px) minmax(280px, 380px);
  gap: 24px;
  align-items: start;
}

.app-header {
  grid-column: 1 / -1;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
}

.title-block {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 2.7rem;
  line-height: 1;
  letter-spacing: 0;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.45;
}

.header-actions {
  display: grid;
  gap: 10px;
  justify-items: end;
}

.game-tabs {
  display: inline-grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  min-width: min(100vw - 48px, 660px);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 4px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 8px 20px rgba(31, 44, 63, 0.08);
}

.quick-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  align-items: center;
}

.tab-button {
  min-height: 38px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #334155;
  cursor: pointer;
  font-weight: 780;
  padding: 0 10px;
  white-space: normal;
}

.tab-button[aria-selected="true"] {
  background: var(--ink);
  color: #fff;
}

.new-game,
.help-link,
.secondary-action {
  border: 0;
  background: var(--ink);
  color: #fff;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(23, 32, 51, 0.18);
  white-space: nowrap;
  font-weight: 800;
}

.help-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: none;
}

.secondary-action {
  width: 100%;
  margin-top: 12px;
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: none;
}

.new-game:active,
.secondary-action:active,
.tab-button:active {
  transform: translateY(1px);
}

.board-zone {
  display: grid;
  gap: 12px;
  justify-items: center;
}

.board-shell {
  width: min(92vw, 680px);
  aspect-ratio: 1 / 1;
  padding: 12px;
  border-radius: 8px;
  background: #223326;
  box-shadow: var(--shadow);
}

.board-shell.kamisado {
  background: #1f2937;
}

.board-shell.great-kingdom {
  background: #31415c;
}

.board-shell.luck-chess {
  background: #223326;
}

.board-shell.variant-gomoku {
  background: #5f513b;
}

.board-shell.variant-gomoku .board {
  gap: 3px;
  padding: 3px;
  border: 0;
  background: #6e6047;
}

.board {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(var(--board-size), 1fr);
  grid-template-rows: repeat(var(--board-size), 1fr);
  border: 2px solid rgba(255, 255, 255, 0.24);
  overflow: hidden;
  touch-action: manipulation;
}

.square {
  position: relative;
  min-width: 0;
  min-height: 0;
  border: 0;
  padding: 0;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--ink);
  transition: filter 120ms ease, box-shadow 120ms ease, transform 120ms ease;
}

.square:hover {
  filter: brightness(1.05);
}

.square.selected {
  box-shadow: inset 0 0 0 5px var(--warning);
  z-index: 2;
}

.square.legal::before,
.square.capture::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 23%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: rgba(23, 32, 51, 0.28);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.square.capture::before {
  width: 78%;
  border: 5px solid rgba(180, 35, 24, 0.76);
  background: transparent;
}

.square.ai-from {
  box-shadow: inset 0 0 0 5px rgba(40, 124, 113, 0.86);
}

.square.ai-to {
  box-shadow: inset 0 0 0 5px rgba(216, 74, 43, 0.9);
}

.square.required-piece {
  box-shadow: inset 0 0 0 5px #111827, inset 0 0 0 9px #facc15;
  z-index: 3;
}

.square.required-piece.selected {
  box-shadow: inset 0 0 0 5px #111827, inset 0 0 0 10px var(--warning);
}

.square.light {
  background: #f2e5c5;
}

.square.dark {
  background: #4f6a4e;
  color: #f8fbf6;
}

.square.kamisado-cell {
  background: var(--cell-color);
}

.square.gk-cell {
  background: #e7edf4;
  border: 1px solid rgba(49, 65, 92, 0.18);
}

.square.gk-cell:nth-child(odd) {
  background: #f4f7fb;
}

.square.gomoku-cell {
  background: #dbc79f;
  border: 0;
  border-radius: 4px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22);
}

.square.gomoku-cell:nth-child(odd) {
  background: #d3bd92;
}

.square.gomoku-cell:hover {
  box-shadow: inset 0 0 0 3px rgba(23, 32, 51, 0.22);
}

.square.gomoku-cell.forbidden::after {
  content: "×";
  position: absolute;
  inset: 50% auto auto 50%;
  width: 46%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(220, 38, 38, 0.9);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 900;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.square.player-territory {
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.18), rgba(37, 99, 235, 0.06)),
    #e7edf4;
}

.square.ai-territory {
  background:
    linear-gradient(135deg, rgba(234, 122, 36, 0.2), rgba(234, 122, 36, 0.06)),
    #f4f7fb;
}

.piece {
  width: 78%;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 2.7rem;
  line-height: 1;
  font-weight: 850;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.24);
  user-select: none;
  pointer-events: none;
}

.piece.white {
  background: linear-gradient(145deg, #fff, #e5edf6);
  color: #152033;
  box-shadow: inset 0 -5px 12px rgba(23, 32, 51, 0.12), 0 7px 14px rgba(0, 0, 0, 0.22);
}

.piece.black {
  background: linear-gradient(145deg, #263143, #0d1420);
  color: #f8fafc;
  box-shadow: inset 0 5px 12px rgba(255, 255, 255, 0.08), 0 7px 14px rgba(0, 0, 0, 0.28);
}

.piece.shinobi {
  font-family: "Noto Serif KR", "Noto Sans CJK KR", serif;
  font-size: 2.2rem;
}

.piece.cannon {
  font-family: "Noto Serif KR", "Noto Sans CJK KR", serif;
  font-size: 2.15rem;
}

.kamisado-piece {
  width: 68%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--piece-color);
  color: var(--piece-ink);
  font-weight: 900;
  font-size: 1rem;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  box-shadow: 0 7px 15px rgba(0, 0, 0, 0.28), inset 0 0 0 3px rgba(255, 255, 255, 0.36);
}

.kamisado-piece.player {
  outline: 4px solid #111827;
}

.kamisado-piece.ai {
  outline: 4px solid #f8fafc;
}

.kamisado-piece.required {
  transform: scale(1.08);
  box-shadow:
    0 0 0 5px rgba(250, 204, 21, 0.92),
    0 10px 18px rgba(0, 0, 0, 0.32),
    inset 0 0 0 3px rgba(255, 255, 255, 0.42);
}

.castle {
  width: 64%;
  aspect-ratio: 1 / 1;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  box-shadow: 0 8px 16px rgba(31, 44, 63, 0.24), inset 0 -7px 12px rgba(0, 0, 0, 0.12);
}

.castle.blue {
  background: linear-gradient(145deg, #3b82f6, #1d4ed8);
}

.castle.orange {
  background: linear-gradient(145deg, #fb923c, #c2410c);
}

.castle.neutral {
  background: linear-gradient(145deg, #ffffff, #d8e0ea);
  color: #263143;
}

.gomoku-stone {
  width: 62%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  pointer-events: none;
  user-select: none;
  box-shadow: 0 8px 14px rgba(31, 44, 63, 0.24), inset 0 -5px 9px rgba(0, 0, 0, 0.18);
}

.gomoku-stone.black-stone {
  background: radial-gradient(circle at 35% 30%, #475569, #111827 62%, #020617);
}

.gomoku-stone.white-stone {
  background: radial-gradient(circle at 35% 30%, #ffffff, #e5edf6 68%, #cbd5e1);
  border: 1px solid rgba(15, 23, 42, 0.2);
}

.coord {
  position: absolute;
  left: 6px;
  bottom: 4px;
  font-size: 0.72rem;
  font-weight: 850;
  opacity: 0.58;
  pointer-events: none;
}

.coordinates {
  width: min(92vw, 680px);
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.88rem;
  padding: 0 12px;
}

.side {
  display: grid;
  gap: 14px;
}

.panel {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  box-shadow: 0 12px 28px rgba(30, 45, 70, 0.08);
}

.status-line {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 13px;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  border-radius: 999px;
  padding: 0 12px;
  background: #e8f4f1;
  color: #11554d;
  font-weight: 850;
  white-space: nowrap;
}

.badge.ai-turn {
  background: #eef0f4;
  color: #273041;
}

.badge.done {
  background: #ffe9e3;
  color: #8e2414;
}

.status-text {
  margin: 0;
  color: var(--ink);
  font-weight: 760;
  line-height: 1.45;
}

.meter {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 12px;
}

.metric {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  min-width: 0;
  background: #fbfcfe;
}

.metric small {
  display: block;
  color: var(--muted);
  margin-bottom: 5px;
  font-size: 0.76rem;
}

.metric strong {
  display: block;
  font-size: 0.96rem;
  overflow-wrap: anywhere;
}

.section-title {
  margin: 0 0 10px;
  font-size: 0.95rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0;
}

.detail-content {
  display: grid;
  gap: 8px;
  color: #344054;
  line-height: 1.5;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.detail-item,
.legend-item {
  min-height: 34px;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfe;
  padding: 7px 9px;
  min-width: 0;
}

.legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  color: #344054;
  font-size: 0.9rem;
}

.swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: inline-block;
  background: var(--swatch);
  border: 2px solid rgba(15, 23, 42, 0.3);
  flex: 0 0 auto;
}

.mini-piece {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
  background: #172033;
  color: white;
  font-size: 0.83rem;
  flex: 0 0 auto;
}

.log {
  display: grid;
  gap: 8px;
  max-height: 240px;
  overflow: auto;
  padding-right: 2px;
}

.log-entry {
  border-left: 4px solid var(--accent);
  background: #fbfcfe;
  border-radius: 0 8px 8px 0;
  padding: 9px 10px;
  color: #344054;
  line-height: 1.38;
  font-size: 0.9rem;
}

.log-entry.battle,
.log-entry.win {
  border-left-color: var(--danger);
}

.log-entry.ai {
  border-left-color: var(--orange);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: rgba(14, 22, 36, 0.58);
  display: grid;
  place-items: center;
  padding: 18px;
}

.modal[hidden] {
  display: none;
}

.modal-panel {
  width: min(480px, 100%);
  background: #fff;
  color: var(--ink);
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.32);
}

.modal-panel h2 {
  margin: 0 0 8px;
  font-size: 1.24rem;
}

.modal-panel p {
  margin: 0 0 12px;
  color: #475467;
  line-height: 1.5;
}

.battle-preview {
  border: 1px solid var(--line);
  background: #fbfcfe;
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 14px;
  line-height: 1.55;
  color: #344054;
}

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

.modal-actions button {
  min-height: 46px;
  border-radius: 8px;
  border: 1px solid var(--line);
  cursor: pointer;
  font-weight: 850;
}

.use-bonus {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.skip-bonus {
  background: #fff;
  color: var(--ink);
}

@media (max-width: 960px) {
  .app {
    grid-template-columns: 1fr;
  }

  .app-header {
    align-items: start;
  }

  .header-actions {
    justify-items: stretch;
  }
}

@media (max-width: 620px) {
  .app {
    padding: 12px;
    gap: 14px;
  }

  .app-header {
    display: grid;
    gap: 12px;
  }

  h1 {
    font-size: 2rem;
  }

  .game-tabs {
    min-width: 0;
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tab-button {
    font-size: 0.84rem;
    padding: 0 6px;
  }

  .new-game {
    width: 100%;
  }

  .quick-actions {
    width: 100%;
  }

  .quick-actions > * {
    flex: 1 1 0;
    justify-content: center;
  }

  .board-shell,
  .coordinates {
    width: calc(100vw - 24px);
  }

  .board-shell {
    padding: 7px;
  }

  .piece {
    width: 82%;
    font-size: 2rem;
  }

  .piece.shinobi {
    font-size: 1.58rem;
  }

  .piece.cannon {
    font-size: 1.54rem;
  }

  .castle {
    font-size: 1.35rem;
  }

  .kamisado-piece {
    width: 70%;
    font-size: 0.78rem;
    outline-width: 3px;
  }

  .coord {
    left: 4px;
    bottom: 3px;
    font-size: 0.58rem;
  }

  .meter,
  .detail-grid,
  .legend,
  .modal-actions {
    grid-template-columns: 1fr;
  }
}

.help-app {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 24px;
  display: grid;
  gap: 22px;
}

.help-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
}

.help-back {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.help-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.help-nav a {
  min-height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  text-decoration: none;
  font-weight: 850;
}

.help-section {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(280px, 430px);
  gap: 22px;
  align-items: start;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.help-copy h2,
.visual-panel h3 {
  margin: 0 0 10px;
  letter-spacing: 0;
}

.help-copy p,
.visual-panel p {
  margin: 0 0 12px;
  color: #344054;
  line-height: 1.55;
}

.help-copy ul {
  margin: 0;
  padding-left: 20px;
  color: #344054;
  line-height: 1.65;
}

.visual-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  padding: 16px;
}

.diagram-board {
  display: grid;
  gap: 2px;
  width: min(100%, 340px);
  aspect-ratio: 1 / 1;
  margin: 8px auto 14px;
  padding: 8px;
  border-radius: 8px;
  background: #31415c;
}

.board-9 {
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
}

.diagram-board span {
  min-width: 0;
  min-height: 0;
  border-radius: 4px;
  background: #edf2f7;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 900;
}

.castle-demo {
  border-radius: 7px !important;
}

.blue-demo {
  background: #2563eb !important;
}

.orange-demo {
  background: #ea7a24 !important;
}

.neutral-demo {
  background: #fff !important;
  color: #111827;
}

.territory-demo {
  background: #bfdbfe !important;
}

.gomoku-help-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  align-items: stretch;
}

.line-demo {
  min-height: 70px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  align-items: center;
  padding: 12px;
  border-radius: 8px;
  background: #d9c39a;
}

.line-demo i,
.line-demo b {
  aspect-ratio: 1 / 1;
  border-radius: 50%;
}

.line-demo i {
  border: 2px dashed rgba(15, 23, 42, 0.5);
}

.line-demo b {
  background: #111827;
}

.purge-demo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.purge-demo span {
  min-height: 62px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 8px;
  background: #e8f4f1;
  color: #11554d;
  font-weight: 850;
}

.battle-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 8px;
  align-items: center;
  margin: 10px 0 14px;
}

.battle-flow span,
.battle-flow strong {
  min-height: 54px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  padding: 8px;
  text-align: center;
}

.battle-flow span {
  background: #eef3f8;
  border: 1px solid var(--line);
}

.battle-flow strong {
  background: #172033;
  color: #fff;
}

.piece-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 6px 0 12px;
}

.kamisado-demo {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 6px;
  margin: 10px 0 14px;
}

.kamisado-demo span {
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--swatch);
  color: #111827;
  font-weight: 900;
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.36);
}

@media (max-width: 780px) {
  .help-app {
    padding: 12px;
  }

  .help-header,
  .help-section {
    grid-template-columns: 1fr;
    display: grid;
  }

  .help-nav,
  .gomoku-help-row {
    grid-template-columns: 1fr 1fr;
  }

  .battle-flow {
    grid-template-columns: 1fr;
  }
}