:root {
  --bg: #fbf6ef;
  --card: #ffffff;
  --ink: #2b2622;
  --muted: #8a7f76;
  --border: #ece2d6;
  --accent: #d9577c;
  --accent-dark: #b93f63;
  --accent-soft: #fde8ee;
  --green: #5f8f4b;
  --green-soft: #eaf3e3;
  --red-line: #e0393e;
  --danger: #c8443a;
  --shadow: 0 1px 2px rgba(80, 55, 30, 0.06), 0 6px 20px rgba(80, 55, 30, 0.07);
  --radius: 18px;
  --font:
    'M PLUS Rounded 1c', 'Hiragino Maru Gothic ProN', 'Hiragino Sans', 'Noto Sans JP', system-ui,
    sans-serif;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1,
h2,
h3 {
  line-height: 1.35;
  margin: 0 0 0.5em;
  font-weight: 800;
}
h1 {
  font-size: 1.5rem;
  overflow-wrap: anywhere;
}
h2 {
  font-size: 1.2rem;
}
h3 {
  font-size: 1.05rem;
}
p {
  margin: 0 0 0.75em;
}
a {
  color: var(--accent-dark);
}
b {
  font-weight: 800;
}

/* ------------------------------------------------------------ レイアウト */
.site-header {
  padding: 14px 16px 6px;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.logo-mark {
  width: 40px;
  height: 40px;
}
.logo-text {
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.logo-text small {
  font-size: 0.68rem;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.container {
  flex: 1;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  padding: 8px 16px 32px;
}

.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.75rem;
  padding: 16px;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 20px;
  margin-bottom: 18px;
}

.row {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
}
.row.wrap {
  flex-wrap: wrap;
}
.row.end {
  justify-content: flex-end;
}
.row.between {
  justify-content: space-between;
}
.stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}
.center {
  text-align: center;
}

.eyebrow {
  color: var(--accent);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}
.hint {
  color: var(--muted);
  font-size: 0.85rem;
}
.notice {
  background: var(--accent-soft);
  border-radius: 12px;
  padding: 14px 16px;
  font-weight: 700;
}
.warn {
  color: var(--danger);
  font-weight: 700;
}
.loading-text {
  text-align: center;
  color: var(--muted);
  padding: 40px 0;
}

/* ------------------------------------------------------------ フォーム */
.field {
  display: block;
  margin: 16px 0;
}
.field > span:first-child {
  display: block;
  font-weight: 800;
  font-size: 0.92rem;
  margin-bottom: 6px;
}
.field small {
  display: block;
  margin-top: 4px;
}

input[type='text'],
textarea {
  width: 100%;
  font: inherit;
  font-size: 16px; /* iOS のズームを防ぐ */
  color: var(--ink);
  background: #fffdfa;
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 11px 14px;
  outline: none;
  transition: border-color 0.15s;
}
textarea {
  resize: vertical;
  min-height: 84px;
}
input[type='text']:focus,
textarea:focus {
  border-color: var(--accent);
}
.url-field {
  font-size: 0.85rem !important;
  color: var(--muted) !important;
  padding: 8px 12px !important;
}

/* ------------------------------------------------------------ ボタン */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font: inherit;
  font-weight: 800;
  font-size: 1rem;
  border: 2px solid var(--border);
  background: #fff;
  color: var(--ink);
  border-radius: 999px;
  padding: 10px 20px;
  cursor: pointer;
  text-decoration: none;
  transition:
    transform 0.08s,
    background 0.15s,
    border-color 0.15s,
    opacity 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.btn:hover:not(:disabled) {
  border-color: #d9cbbb;
}
.btn:active:not(:disabled) {
  transform: translateY(1px) scale(0.99);
}
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.btn:focus-visible {
  outline: 3px solid rgba(217, 87, 124, 0.35);
  outline-offset: 2px;
}
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 3px 0 var(--accent-dark);
}
.btn.primary:hover:not(:disabled) {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}
.btn.danger {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
  box-shadow: 0 3px 0 #9c3129;
}
.btn.ghost {
  background: transparent;
}
.btn.big {
  width: 100%;
  padding: 14px 20px;
  font-size: 1.08rem;
}
.btn.small {
  padding: 6px 14px;
  font-size: 0.88rem;
}
.btn.round {
  width: 56px;
  height: 56px;
  padding: 0;
  font-size: 1.6rem;
}
.btn.loading {
  position: relative;
  color: transparent !important;
}
.btn.loading::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border: 3px solid rgba(255, 255, 255, 0.6);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.btn:not(.primary):not(.danger).loading::after {
  border-color: rgba(0, 0, 0, 0.15);
  border-top-color: var(--ink);
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
.link {
  font: inherit;
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  cursor: pointer;
  text-align: left;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.link:hover {
  color: var(--accent-dark);
}

.sticky-action {
  position: sticky;
  bottom: 0;
  padding: 12px 0 calc(12px + env(safe-area-inset-bottom));
  margin: 8px -4px 0;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0), #fff 30%);
  z-index: 2;
}

/* ------------------------------------------------------------ トップ */
.intro {
  padding: 8px 4px 4px;
}
.lead {
  font-size: 1.15rem;
  font-weight: 800;
}
.intro-list {
  margin: 0 0 18px;
  padding-left: 1.2em;
  color: #5a514a;
  font-size: 0.92rem;
}
.steps {
  list-style: none;
  padding: 0;
  margin: 0 0 18px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}
.steps li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 0.7rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.3;
}
.step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #f3ece4;
  font-weight: 800;
  font-size: 0.85rem;
}
.steps li.current {
  color: var(--accent-dark);
  font-weight: 800;
}
.steps li.current .step-num {
  background: var(--accent);
  color: #fff;
}
.steps li.done .step-num {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.counter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  margin: 22px 0 4px;
}
.count-value {
  font-size: 3rem;
  font-weight: 800;
  min-width: 2.2em;
  text-align: center;
  color: var(--accent);
}

.history ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.history li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
}
.history li:last-child {
  border-bottom: none;
}
.history small {
  color: var(--muted);
}

/* ------------------------------------------------------------ URL カード */
.share-card {
  border: 2px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  margin: 14px 0;
}
.share-head {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 8px;
}
.share-head h3 {
  margin: 0;
}
.share-head p {
  margin: 0;
}
.share-icon {
  font-size: 1.6rem;
  line-height: 1;
  padding-top: 2px;
}
.qr-box {
  margin-top: 12px;
  text-align: center;
}
.qr-box img {
  display: block;
  width: min(260px, 100%);
  height: auto;
  margin: 0 auto 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.host-url {
  border: 2px dashed var(--accent);
}

/* ------------------------------------------------------------ 主催者画面 */
.rules {
  background: #fff8ef;
  border-radius: 12px;
  padding: 12px 14px;
  white-space: pre-wrap;
  font-size: 0.92rem;
  overflow-wrap: anywhere;
}
.rules-label {
  display: inline-block;
  background: var(--green);
  color: #fff;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0 10px;
  margin-right: 8px;
}
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
  margin: 12px 0;
}
.stat {
  background: #fbf7f2;
  border-radius: 14px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
}
.stat.complete {
  background: var(--green-soft);
}
.stat-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
}
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
}
.stat-number small {
  font-size: 0.85rem;
  margin-left: 2px;
}
.stat-sub {
  font-size: 0.78rem;
  color: var(--muted);
  min-height: 1.2em;
}
.stat-group {
  border: 2px solid #f3ece4;
  border-radius: 16px;
  padding: 10px 10px 0;
  margin: 12px 0;
}
.stat-group .stats {
  margin-top: 4px;
}
.stat-group-note {
  font-size: 0.78rem;
  color: var(--muted);
  margin: -4px 4px 10px;
}
.stat-group-title {
  font-size: 0.8rem;
  font-weight: 800;
  margin: 0 4px;
}
.close-area {
  margin-top: 20px;
}
.close-area .hint {
  margin-top: 8px;
}
details.urls summary {
  cursor: pointer;
  font-weight: 800;
}

/* ------------------------------------------------------------ 参加 */
.seats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(54px, 1fr));
  gap: 8px;
}
.seat {
  font: inherit;
  border: 2px solid var(--border);
  background: #fff;
  border-radius: 14px;
  padding: 8px 0 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  color: var(--ink);
  -webkit-tap-highlight-color: transparent;
}
.seat-num {
  font-weight: 800;
  font-size: 1.1rem;
  line-height: 1.2;
}
.seat-state {
  font-size: 0.7rem;
  min-height: 1.2em;
  color: var(--muted);
}
.seat.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 2px var(--accent) inset;
}
.seat.taken {
  background: #f1ebe4;
  color: #b8ada3;
  cursor: not-allowed;
}
.seat.me {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.seat.me .seat-state {
  color: #fff;
}
.seat:disabled {
  cursor: default;
}

.done {
  text-align: center;
  padding: 10px 0;
}
.done-icon {
  font-size: 2.6rem;
  margin: 0;
}
.done-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 4px;
}

/* ------------------------------------------------------------ 選択肢 */
.my-choice {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-align: center;
  background: var(--accent-soft);
  border-radius: 14px;
  padding: 14px;
  margin: 14px 0;
}
.my-choice-label {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--accent-dark);
}
.my-choice-text {
  font-size: 1.4rem;
  font-weight: 800;
  overflow-wrap: anywhere;
}

/* ------------------------------------------------------------ 盤面 */
.board-frame {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 8px 0;
  border-radius: 14px;
  background: #fffdf9;
  border: 2px solid #f3ece4;
}
.board {
  display: block;
  margin: 0 auto;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}
.board .vertical {
  stroke: var(--ink);
  stroke-width: 3;
  stroke-linecap: round;
}
.board .cap {
  fill: var(--ink);
}
.board .rung {
  stroke: var(--ink);
  stroke-width: 4;
  stroke-linecap: round;
}
.board .rung.red {
  stroke: var(--red-line);
}
.board .rung.preview {
  stroke: var(--accent);
  stroke-width: 5;
  stroke-dasharray: 7 5;
}
.board .rung.mine {
  stroke: var(--accent);
  stroke-width: 5;
}
.board .label {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 800;
  fill: var(--ink);
  writing-mode: vertical-rl;
  letter-spacing: 0.04em;
}
.board .label.num {
  writing-mode: horizontal-tb;
  text-anchor: middle;
  fill: var(--muted);
  font-size: 15px;
}
.board .label.hidden-choice,
.board .label.empty {
  fill: #c9bfb5;
}
.board .label.mine,
.board .label.me {
  fill: var(--accent);
}
.board .label.choice {
  fill: #4a413a;
}
.board .label.clickable {
  cursor: pointer;
}
.board .label.active {
  fill: var(--accent-dark);
  font-size: 18px;
}
.board .cell {
  fill: transparent;
  cursor: pointer;
}
@media (hover: hover) {
  .board .cell:hover {
    fill: rgba(217, 87, 124, 0.12);
  }
  .board .cell.disabled:hover {
    fill: rgba(0, 0, 0, 0.04);
  }
}
.board .cell.selected {
  fill: rgba(217, 87, 124, 0.16);
}
.board .cell.disabled {
  cursor: not-allowed;
}
.board .trace {
  fill: none;
  stroke-width: 7;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.85;
}
.board .trace.faded {
  opacity: 0.22;
}
.board .marker {
  stroke: #fff;
  stroke-width: 3;
}

.scroll-hint {
  display: none;
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
  margin: -4px 0 0;
}
.board-frame.scrollable + .scroll-hint {
  display: block;
}
.pick-status {
  text-align: center;
  font-weight: 800;
  font-size: 0.92rem;
  min-height: 1.6em;
  margin: 4px 0 0;
}
.notes {
  margin: 0 0 8px;
  padding-left: 1.2em;
  font-size: 0.88rem;
  color: #5a514a;
}

/* ------------------------------------------------------------ 完成 */
.me-note {
  font-weight: 800;
  color: var(--accent-dark);
}
.stage {
  position: relative;
}
.caption {
  min-height: 3.6em;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--ink);
  color: #fff;
  border-radius: 14px;
  padding: 8px 12px;
  margin-top: 12px;
  line-height: 1.4;
}
.caption strong {
  font-size: 1.1rem;
}
.caption span {
  font-size: 0.85rem;
  opacity: 0.85;
}
.stage-actions {
  display: flex;
  justify-content: center;
}
.stage-actions .skip {
  margin-top: 4px;
}
.result-card {
  text-align: center;
  background: #fff8ef;
  border-radius: 16px;
  padding: 16px;
  margin-top: 12px;
  animation: pop 0.4s ease-out;
}
.result-name {
  font-weight: 800;
  margin: 0;
}
.result-choice {
  font-size: 2rem;
  font-weight: 800;
  margin: 0;
  overflow-wrap: anywhere;
}
@keyframes pop {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}
.result-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.result-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  flex-wrap: wrap;
}
.result-list li:last-child {
  border-bottom: none;
}
.result-list li.me {
  background: var(--accent-soft);
  border-radius: 10px;
  padding-left: 8px;
  padding-right: 8px;
}
.result-list .seat {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  padding: 0;
  border-radius: 50%;
  background: #f3ece4;
  border: none;
  font-size: 0.8rem;
  cursor: inherit;
}
.result-list .arrow {
  color: var(--muted);
}
.result-list .choice {
  font-weight: 800;
  overflow-wrap: anywhere;
}
.result-list .choice small {
  color: var(--muted);
  font-weight: 400;
  margin-left: 4px;
}
.result-list .secret {
  color: #c9bfb5;
  letter-spacing: 0.1em;
}
.tag {
  font-size: 0.7rem;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 0 8px;
}

/* ------------------------------------------------------------ ダイアログ・トースト */
.dialog {
  border: none;
  border-radius: var(--radius);
  padding: 22px 20px;
  max-width: min(420px, calc(100vw - 32px));
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  color: var(--ink);
  font-family: var(--font);
}
.dialog::backdrop {
  background: rgba(43, 38, 34, 0.45);
}
.dialog-body {
  font-size: 0.92rem;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + env(safe-area-inset-bottom));
  transform: translate(-50%, 20px);
  background: var(--ink);
  color: #fff;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.9rem;
  max-width: calc(100vw - 32px);
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.2s,
    transform 0.2s;
  z-index: 100;
}
.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}
.toast.error {
  background: var(--danger);
}

[hidden] {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}