:root {
  --bg: #faf6ec;
  --panel: #fffdf8;
  --panel-2: #f2ead8;
  --text: #241f30;
  --text-dim: #6c6278;
  --accent: #a85c09;
  --accent-soft: #8f4d08;
  --accent-on: #fffaf0;
  --ok: #1b7a4a;
  --danger: #bc3939;
  --border: #e4d9c2;
  --shadow: rgba(64, 44, 12, 0.12);
  --glow-1: rgba(179, 98, 10, 0.10);
  --glow-2: rgba(47, 111, 168, 0.08);
  --surface-info-bg: #e4edf9;
  --surface-info-fg: #2e6ca3;
  --surface-warn-bg: #faf0da;
  --surface-warn-fg: var(--accent-soft);
  --surface-danger-bg: #fbe4e1;
  --surface-danger-fg: var(--danger);
  --surface-success-bg: #e1f3e7;
  --surface-success-fg: var(--ok);
  --radius: 18px;
  --radius-sm: 12px;
  --touch: 46px;
  --serif:
    "Hiragino Mincho ProN",
    "Yu Mincho",
    "Noto Serif JP",
    serif;
  --sans:
    "Hiragino Kaku Gothic ProN",
    "Hiragino Sans",
    "Yu Gothic",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  --header-h: 76px;
  color-scheme: light;
}
[data-theme=dark] {
  --bg: #12111c;
  --panel: #1c1b2a;
  --panel-2: #262541;
  --text: #f1eefc;
  --text-dim: #a9a4c2;
  --accent: #ffb84d;
  --accent-soft: #ffd28a;
  --accent-on: #1a1400;
  --ok: #5fe0a0;
  --danger: #ff7a7a;
  --border: #33314f;
  --shadow: rgba(0, 0, 0, 0.5);
  --glow-1: rgba(255, 184, 77, 0.12);
  --glow-2: rgba(127, 208, 255, 0.08);
  --surface-info-bg: #202446;
  --surface-info-fg: #7fd0ff;
  --surface-warn-bg: #2a2440;
  --surface-warn-fg: var(--accent);
  --surface-danger-bg: #402424;
  --surface-danger-fg: var(--danger);
  --surface-success-bg: #1f3a2c;
  --surface-success-fg: var(--ok);
  color-scheme: dark;
}
* {
  box-sizing: border-box;
}
html {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  background: var(--bg);
}
body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg);
  background-image:
    radial-gradient(
      720px 420px at 88% -8%,
      var(--glow-1),
      transparent 60%),
    radial-gradient(
      560px 420px at 4% 12%,
      var(--glow-2),
      transparent 55%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--sans);
  letter-spacing: 0.01em;
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}
header {
  padding: max(12px, env(safe-area-inset-top)) 16px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 97%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
}
header .brand {
  min-width: 0;
}
header .brand {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 2px 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.12rem;
  color: var(--text);
}
.brand-moon {
  font-size: 1rem;
}
.brand-text {
  font-weight: 700;
}
.header-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}
.header-actions button + button {
  margin-left: 0;
}
[hidden][hidden][hidden] {
  display: none;
}
.icon-btn {
  min-width: var(--touch);
  min-height: var(--touch);
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-size: 1.1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.icon-btn:hover {
  border-color: var(--accent);
}
.icon-btn:active {
  transform: scale(0.92);
}
#theme-toggle svg {
  width: 19px;
  height: 19px;
  display: block;
}
#theme-toggle .icon-sun {
  display: block;
}
#theme-toggle .icon-moon {
  display: none;
}
[data-theme=dark] #theme-toggle .icon-sun {
  display: none;
}
[data-theme=dark] #theme-toggle .icon-moon {
  display: block;
}
main {
  flex: 1;
  padding: 18px 16px 28px;
  max-width: 480px;
  width: 100%;
  margin: 0 auto;
}
.screen {
  display: none;
}
.screen.active {
  display: block;
  animation: fade-in 0.25s ease;
}
@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 14px;
  box-shadow: 0 10px 30px -18px var(--shadow), 0 1px 0 rgba(255, 255, 255, 0.03) inset;
}
.eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-soft);
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}
.section-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-dim);
  font-size: 0.76rem;
  margin: 20px 4px 12px;
}
.section-divider::before,
.section-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}
h1,
h2,
h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  letter-spacing: 0.02em;
}
h2 {
  font-size: 1.2rem;
}
h3 {
  font-size: 0.95rem;
  color: var(--text-dim);
  font-weight: 700;
}
p {
  line-height: 1.75;
}
ruby {
  ruby-align: center;
}
label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin: 12px 0 5px;
}
input[type=text],
input[type=password],
select {
  width: 100%;
  min-height: var(--touch);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-size: 1rem;
  font-family: var(--sans);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
select {
  -webkit-appearance: none;
  appearance: none;
  padding-right: 36px;
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='none' stroke='%236c6278' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='5 8 10 13 15 8'/%3E%3C/svg%3E");
}
[data-theme=dark] select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='none' stroke='%23a9a4c2' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='5 8 10 13 15 8'/%3E%3C/svg%3E");
}
input[type=text]:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
}
button {
  min-height: var(--touch);
  min-width: var(--touch);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: none;
  font-weight: 700;
  font-size: 1rem;
  font-family: var(--sans);
  cursor: pointer;
  box-shadow: 0 6px 16px -8px color-mix(in srgb, var(--accent) 70%, transparent);
  transition:
    transform 0.12s ease,
    box-shadow 0.12s ease,
    filter 0.12s ease;
}
button.cta {
  background: var(--accent);
  color: var(--accent-on);
}
[data-theme=dark] button.cta {
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--accent) 100%, white 12%),
      var(--accent));
}
button:hover {
  filter: brightness(1.04);
}
button:active {
  transform: scale(0.98);
  box-shadow: 0 2px 8px -4px color-mix(in srgb, var(--accent) 70%, transparent);
}
button.secondary {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}
button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  filter: none;
  box-shadow: none;
}
button + button {
  margin-left: 8px;
}
.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.row > * {
  flex: 1;
}
.row button {
  font-size: 0.86rem;
  padding: 10px 6px;
  white-space: normal;
  line-height: 1.3;
}
.row > button + button {
  margin-left: 0;
}
.phase-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--panel-2);
  border: 1px solid var(--border);
  margin-bottom: 6px;
}
.phase-badge.preparing {
  background: var(--surface-info-bg);
  color: var(--surface-info-fg);
  border-color: transparent;
}
.player-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.player-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 4px;
  border-bottom: 1px solid var(--border);
}
.player-list li:last-child {
  border-bottom: none;
}
.player-list li > span:first-child {
  display: flex;
  align-items: center;
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--text-dim);
  display: inline-block;
  margin-right: 8px;
}
.dot.on {
  background: var(--ok);
}
.tag-host {
  font-size: 0.68rem;
  border-radius: 999px;
  padding: 1px 7px;
  margin-left: 6px;
  font-weight: 700;
  color: var(--accent-soft);
  border: 1px solid var(--accent);
}
.note {
  color: var(--text-dim);
  font-size: 0.84rem;
}
.error {
  color: var(--danger);
  font-weight: 700;
  margin: 8px 0;
}
#phase-error {
  position: sticky;
  top: var(--header-h);
  z-index: 9;
}
dialog#confirm-dialog {
  max-width: 360px;
  width: calc(100% - 48px);
  margin: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 10px 30px -18px var(--shadow);
}
dialog#confirm-dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
}
dialog#confirm-dialog p {
  margin: 0;
}
.game-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.game-list li {
  margin-bottom: 12px;
}
.game-card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  text-decoration: none;
  color: var(--text);
  box-shadow: 0 10px 30px -18px var(--shadow);
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.game-card:hover {
  border-color: var(--accent);
}
.game-card:active {
  transform: scale(0.99);
}
.game-card .eyebrow {
  margin-bottom: 6px;
}
.my-number-box {
  margin-top: 14px;
  padding: 18px;
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  border: 1px solid var(--border);
  text-align: center;
}
.my-number-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.my-number {
  display: block;
  font-family: var(--serif);
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.board-list {
  list-style: decimal;
  margin: 0;
  padding-left: 22px;
}
.board-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 4px;
  border-bottom: 1px solid var(--border);
}
.board-list li:last-child {
  border-bottom: none;
}
.board-name {
  flex: 1;
  overflow-wrap: anywhere;
}
.board-number {
  font-weight: 700;
  font-family: var(--serif);
  font-size: 1.05rem;
}
.board-list li.board-wrong .board-name,
.board-list li.board-wrong .board-number {
  color: var(--danger);
}
#result-summary-card.result-ok #result-headline {
  color: var(--ok);
}
#result-summary-card.result-ng #result-headline {
  color: var(--danger);
}
@media (min-width: 460px) {
  .row.two-col > * {
    flex: 1 1 calc(50% - 4px);
  }
}
.guide-body main {
  max-width: 560px;
}
.guide-section {
  scroll-margin-top: 76px;
}
.guide-toc {
  margin-top: 14px;
}
.guide-toc ol {
  margin: 0;
  padding-left: 1.3em;
}
.guide-toc li {
  margin: 6px 0;
}
.guide-steps,
.guide-tips {
  margin: 0;
  padding-left: 1.4em;
}
.guide-steps li,
.guide-tips li {
  margin: 10px 0;
  line-height: 1.75;
}
.guide-example-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.guide-example-list li {
  padding: 12px 14px;
  margin-bottom: 10px;
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  border: 1px solid var(--border);
}
.guide-example-list li:last-child {
  margin-bottom: 0;
}
.guide-example-theme {
  margin: 0 0 4px;
  font-weight: 700;
}
a.cta {
  display: inline-block;
  text-align: center;
  min-height: var(--touch);
  min-width: var(--touch);
  line-height: calc(var(--touch) - 20px);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  font-family: var(--sans);
  text-decoration: none;
  background: var(--accent);
  color: var(--accent-on);
  box-shadow: 0 6px 16px -8px color-mix(in srgb, var(--accent) 70%, transparent);
  transition:
    transform 0.12s ease,
    box-shadow 0.12s ease,
    filter 0.12s ease;
}
[data-theme=dark] a.cta {
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--accent) 100%, white 12%),
      var(--accent));
}
a.cta:hover {
  filter: brightness(1.04);
}
a.cta:active {
  transform: scale(0.98);
}
.guide-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: var(--touch);
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  color: var(--text);
  text-decoration: none;
  font-size: 0.86rem;
  text-align: center;
}
.guide-link:hover {
  border-color: var(--accent);
}