:root {
  --bg-top: #fff4c9;
  --bg-bottom: #d7f6ff;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-soft: rgba(245, 251, 255, 0.96);
  --text: #1f3c55;
  --muted: #64798b;
  --accent: #ff914d;
  --accent-strong: #ff7021;
  --line: rgba(31, 60, 85, 0.08);
  --shadow: 0 16px 38px rgba(38, 78, 114, 0.14);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --seat-a: #ff8a7a;
  --seat-b: #5ba9ff;
  --seat-c: #ffd45b;
  --seat-d: #63c77d;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  overflow: hidden;
  font-family: "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.72), transparent 24%),
    radial-gradient(circle at 15% 18%, rgba(255, 217, 102, 0.28), transparent 18%),
    radial-gradient(circle at bottom left, rgba(255, 255, 255, 0.64), transparent 22%),
    radial-gradient(circle at 80% 82%, rgba(91, 169, 255, 0.18), transparent 20%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(100vw, 1180px);
  height: 100dvh;
  margin: 0 auto;
  padding: 12px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 8px;
}

.hero {
  text-align: center;
}

.hero-nav {
  margin-bottom: 6px;
  display: flex;
  justify-content: flex-end;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 700;
}

.hero-kicker {
  margin: 0 0 4px;
  color: var(--accent-strong);
  font-weight: 700;
  letter-spacing: 0.05em;
  font-size: 0.84rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.65rem, 3.1vw, 2.6rem);
  line-height: 1.08;
}

.hero-copy {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.screen {
  min-height: 0;
}

#start-screen {
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.panel {
  background: var(--panel);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  padding: 12px;
  min-height: 0;
}

.hidden {
  display: none;
}

.panel-title {
  margin: 0;
  font-size: 1.1rem;
}

.setup-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.setup-card {
  min-height: 0;
  padding: 12px;
  border-radius: var(--radius-lg);
  background: var(--panel-soft);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.welcome-card {
  background:
    radial-gradient(circle at top right, rgba(255, 214, 130, 0.44), transparent 30%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(255, 248, 232, 0.98));
}

.setup-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: baseline;
}

.setup-note,
.intro-copy,
.tutorial-list,
.hero-copy {
  color: var(--muted);
}

.setup-note {
  margin: 0;
  font-size: 0.84rem;
}

.intro-copy,
.tutorial-list {
  margin: 0;
  line-height: 1.6;
  font-size: 0.9rem;
}

.tutorial-list {
  padding-left: 1.2rem;
}

.help-button,
.tutorial-close-button {
  border: none;
  background: #eef6fb;
  color: var(--text);
  border-radius: 999px;
  padding: 8px 12px;
  font-weight: 700;
  font-size: 0.86rem;
}

.welcome-visual {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 1.8rem;
}

.segmented-control {
  display: grid;
  grid-auto-flow: column;
  gap: 6px;
}

.segment {
  border: 1px solid rgba(91, 169, 255, 0.22);
  background: #fff;
  color: var(--text);
  border-radius: 999px;
  padding: 9px 12px;
  font-weight: 700;
  transition:
    transform 120ms ease,
    background-color 120ms ease,
    color 120ms ease,
    border-color 120ms ease;
}

.segment.is-selected {
  border-color: transparent;
  background: linear-gradient(180deg, #5ba9ff, #337fd0);
  color: #fff;
}

.player-form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.player-field {
  display: grid;
  gap: 6px;
}

.player-field label {
  font-weight: 700;
  color: var(--muted);
  font-size: 0.85rem;
}

.player-field input {
  width: 100%;
  border: 1px solid rgba(91, 169, 255, 0.18);
  border-radius: 14px;
  padding: 9px 11px;
  background: #fff;
  color: var(--text);
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.theme-card {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 16px;
  padding: 10px;
  text-align: left;
  transition:
    transform 120ms ease,
    border-color 120ms ease,
    box-shadow 120ms ease;
}

.theme-card strong {
  display: block;
  margin-bottom: 4px;
}

.theme-card span {
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.theme-card.is-selected {
  border-color: rgba(255, 112, 33, 0.3);
  box-shadow: inset 0 0 0 2px rgba(255, 112, 33, 0.12);
  transform: translateY(-1px);
}

.deck-controls {
  display: grid;
  gap: 8px;
}

.toggle-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}

.toggle-card input {
  width: 20px;
  height: 20px;
  accent-color: var(--accent-strong);
}

.deck-summary {
  padding: 10px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(255, 226, 205, 0.85), rgba(255, 255, 255, 0.96));
  line-height: 1.5;
  font-size: 0.86rem;
}

.primary-button,
.secondary-button {
  border: none;
  border-radius: 999px;
  padding: 16px 18px;
  font-weight: 700;
  font-size: 1.04rem;
}

.primary-button {
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  color: #fff;
  box-shadow: 0 12px 24px rgba(255, 112, 33, 0.22);
}

.secondary-button {
  background: #ecf5fb;
  color: var(--text);
}

.start-button {
  margin-top: 8px;
  width: 100%;
}

.game-topbar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.status-chip,
.result-card,
.message-card,
.leaderboard-row {
  border-radius: var(--radius-md);
  background: #fff;
  border: 1px solid var(--line);
}

.status-chip {
  padding: 12px;
  text-align: center;
}

.status-chip span,
.result-label {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.82rem;
}

.arena {
  position: relative;
  height: calc(100% - 184px);
  min-height: 420px;
  margin-top: 12px;
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(245, 251, 255, 0.98), rgba(255, 255, 255, 0.98));
  border: 1px solid var(--line);
  overflow: hidden;
}

.seat-button {
  position: absolute;
  width: 220px;
  min-height: 112px;
  padding: 14px;
  border: none;
  border-radius: 22px;
  text-align: left;
  color: #fff;
  box-shadow: var(--shadow);
  display: grid;
  gap: 8px;
  align-content: start;
  transition:
    transform 100ms ease,
    opacity 120ms ease,
    filter 120ms ease;
}

.seat-button:disabled {
  cursor: default;
}

.seat-button[data-seat-slot="0"] {
  background: linear-gradient(180deg, var(--seat-a), #ef6c5e);
}

.seat-button[data-seat-slot="1"] {
  background: linear-gradient(180deg, var(--seat-b), #3b85d7);
}

.seat-button[data-seat-slot="2"] {
  background: linear-gradient(180deg, var(--seat-c), #efbc2b);
  color: #5a4605;
}

.seat-button[data-seat-slot="3"] {
  background: linear-gradient(180deg, var(--seat-d), #40a15a);
}

.seat-top-left {
  top: 18px;
  left: 18px;
}

.seat-top-right {
  top: 18px;
  right: 18px;
}

.seat-bottom-left {
  bottom: 18px;
  left: 18px;
}

.seat-bottom-right {
  bottom: 18px;
  right: 18px;
}

.seat-button.is-hidden {
  display: none;
}

.seat-button.is-locked {
  filter: saturate(0.72);
}

.seat-button.is-claimed {
  transform: scale(1.03);
  box-shadow: 0 18px 34px rgba(0, 0, 0, 0.18);
}

.seat-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.25);
  font-weight: 800;
  font-size: 1.1rem;
}

.seat-name {
  display: block;
  font-size: 1.2rem;
  font-weight: 800;
}

.seat-copy {
  display: block;
  font-size: 0.9rem;
  opacity: 0.9;
}

.flip-stack {
  position: absolute;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  width: min(34vw, 310px);
  aspect-ratio: 3 / 4;
  border: none;
  background: transparent;
  padding: 0;
}

.flip-card,
.flip-card-inner,
.card-face {
  width: 100%;
  height: 100%;
}

.flip-card {
  perspective: 1400px;
}

.flip-card-inner {
  position: relative;
  transform-style: preserve-3d;
  transition: transform 420ms ease;
}

.flip-card.is-revealed .flip-card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  border-radius: 28px;
  backface-visibility: hidden;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 20px;
}

.card-back {
  background: linear-gradient(180deg, #ffb67f, #ff914d);
  color: #fff;
  box-shadow: 0 26px 48px rgba(255, 112, 33, 0.24);
}

.card-back-mark {
  font-size: 4.2rem;
  font-weight: 800;
  line-height: 1;
}

.card-back-copy {
  font-size: 1rem;
  font-weight: 700;
}

.card-front {
  background: linear-gradient(180deg, #ffffff, #f4fbff);
  border: 1px solid rgba(91, 169, 255, 0.14);
  transform: rotateY(180deg);
  color: var(--text);
  box-shadow: 0 26px 48px rgba(38, 78, 114, 0.16);
}

.item-emoji {
  font-size: clamp(4rem, 8vw, 5.5rem);
}

.item-label {
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  font-weight: 800;
}

.item-sub-label {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--muted);
}

.game-bottom {
  margin-top: 12px;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 10px;
}

.message-card {
  padding: 14px 16px;
  display: grid;
  gap: 6px;
}

.message-card h2,
.message-card p,
.message-card strong,
.message-card span {
  margin: 0;
}

.message-card.subtle {
  background: rgba(248, 251, 255, 0.96);
}

.result-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.winner-text,
.result-note {
  margin: 4px 0 0;
}

.winner-text {
  font-size: 1.4rem;
  font-weight: 800;
}

.result-note {
  color: var(--muted);
}

.result-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.result-card {
  padding: 14px;
  text-align: center;
}

.result-card strong {
  font-size: 1.5rem;
}

.leaderboard {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}

.leaderboard-row {
  padding: 12px 14px;
  display: grid;
  grid-template-columns: 80px 1fr auto auto;
  gap: 10px;
  align-items: center;
}

.leaderboard-rank {
  font-weight: 800;
}

.leaderboard-name {
  font-weight: 700;
}

.leaderboard-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.leaderboard-score {
  font-size: 1.2rem;
  font-weight: 800;
}

.result-actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.tutorial-modal {
  position: fixed;
  inset: 0;
  z-index: 20;
}

.tutorial-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(19, 37, 53, 0.28);
}

.tutorial-dialog {
  position: absolute;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  width: min(88vw, 620px);
  padding: 18px;
  border-radius: 24px;
  background: #fff;
  box-shadow: 0 28px 60px rgba(19, 37, 53, 0.24);
}

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

@media (max-width: 900px) {
  .app-shell {
    width: 100vw;
    padding: 8px;
  }

  .setup-layout,
  .game-bottom,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .game-topbar {
    grid-template-columns: 1fr;
  }

  .arena {
    min-height: 520px;
    height: auto;
  }

  .seat-button {
    width: 160px;
    min-height: 96px;
  }

  .flip-stack {
    width: min(56vw, 260px);
  }

  .leaderboard-row {
    grid-template-columns: 60px 1fr auto;
  }

  .leaderboard-meta {
    grid-column: 2 / 4;
  }
}