:root {
  --ink: #f6efe6;
  --ink-soft: rgba(246, 239, 230, 0.82);
  --paper: #efe3cd;
  --paper-edge: #d9c6a6;
  --paper-ink: #3a2f27;
  --paper-soft: #6c5b4b;
  --wood: #5b4334;
  --wood-dark: #3a2a20;
  --wood-light: #7a5c47;
  --accent: #f3c98b;
  --navy: #26345a;
  --glass: rgba(34, 32, 52, 0.5);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --serif: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", serif;
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  font-synthesis: none;
  -webkit-text-size-adjust: 100%;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #2b2d48;
  overscroll-behavior: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

[hidden] {
  display: none !important;
}

#sea {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

button {
  min-width: 44px;
  min-height: 44px;
  font: inherit;
  color: inherit;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* 前景：桟橋の先端に座って竿を持つねこ。糸は画像の竿先から3Dの浮きへつなぐ */
.cat-pier {
  position: fixed;
  --pier-x: -50%;
  --pier-y: 9%;
  left: 50%;
  bottom: 0;
  width: min(118vw, 80vh);
  height: auto;
  pointer-events: none;
  transform: translate(var(--pier-x), var(--pier-y));
  transform-origin: 50% 100%;
  filter: drop-shadow(0 -2px 14px rgba(20, 16, 30, 0.28));
  transition: transform 0.6s ease, opacity 0.6s ease;
}

/* 縦画面では大きめに置き、桟橋の先端とねこを操作ボタンより上に出す */
@media (orientation: portrait) {
  .cat-pier {
    width: min(142vw, 86vh);
  }
}

/* 投げた瞬間、ねこが竿をあおって少し伸び上がる */
.cat-pier.casting {
  animation: cat-cast 0.55s ease-out;
}

@keyframes cat-cast {
  0% { transform: translate(var(--pier-x), var(--pier-y)); }
  35% { transform: translate(var(--pier-x), calc(var(--pier-y) - 1.4%)) scale(1.012); }
  100% { transform: translate(var(--pier-x), var(--pier-y)); }
}

/* 一度竿をあおって、一本釣りのように引き上げる */
.cat-pier.hoisting { animation: cat-hoist 0.9s ease-out; }
@keyframes cat-hoist {
  0% { transform: translate(var(--pier-x), var(--pier-y)) rotate(0); }
  28% { transform: translate(var(--pier-x), calc(var(--pier-y) - 5%)) rotate(-4deg); }
  65% { transform: translate(var(--pier-x), calc(var(--pier-y) - 2%)) rotate(-2deg); }
  100% { transform: translate(var(--pier-x), var(--pier-y)); }
}
/* 望遠で浮きへ寄っているあいだは、手前の桟橋とねこをそっと下げる */
.closeup .cat-pier:not(.hoisting) {
  animation: none;
  transform: translate(var(--pier-x), 60%);
  opacity: 0;
}

/* 上部の表示 */
.hud {
  position: fixed;
  top: calc(var(--safe-top) + 8px);
  left: calc(var(--safe-left) + 8px);
  right: calc(var(--safe-right) + 8px);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 6px;
  pointer-events: none;
}

.hud > * {
  pointer-events: auto;
}

.sign {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 10px;
  border-radius: 8px;
  background:
    repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.06) 0 2px, transparent 2px 7px),
    linear-gradient(180deg, var(--wood-light), var(--wood));
  box-shadow: inset 0 0 0 1px rgba(255, 230, 200, 0.15), 0 4px 10px rgba(10, 8, 20, 0.35);
  color: #f6eadb;
}

.sign-anchor {
  font-size: 20px;
  opacity: 0.85;
}

.sign-text {
  display: grid;
  line-height: 1.2;
}

.sign-place {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.sign-place rt {
  font-size: 8px;
  letter-spacing: 0;
}

.sign-tide {
  font-size: 11px;
  opacity: 0.85;
  letter-spacing: 0.1em;
}

.stats {
  display: flex;
  align-items: center;
  gap: 6px;
}

.stat {
  display: grid;
  justify-items: center;
  min-width: 56px;
  margin: 0;
  padding: 4px 10px;
  border-radius: 8px;
  background: var(--paper);
  color: var(--paper-ink);
  box-shadow: inset 0 0 0 1px var(--paper-edge), 0 4px 10px rgba(10, 8, 20, 0.3);
  line-height: 1.15;
}

.stat-label {
  font-size: 10px;
  color: var(--paper-soft);
  letter-spacing: 0.1em;
}

.stat-value {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
}

.stat-value small {
  font-size: 12px;
}

.round-button {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, var(--wood-light), var(--wood-dark));
  color: #f6eadb;
  font-size: 18px;
  box-shadow: 0 4px 10px rgba(10, 8, 20, 0.4);
}

.hint {
  position: fixed;
  top: calc(var(--safe-top) + 64px);
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: calc(100vw - 24px);
  margin: 0;
  padding: 6px 14px;
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
  color: #fffaf2;
  text-shadow: 0 1px 2px rgba(20, 14, 30, 0.9), 0 0 10px rgba(20, 14, 30, 0.6);
  pointer-events: none;
  word-break: auto-phrase;
}

.hint.alert {
  padding: 6px 18px;
  border-radius: 999px;
  background: rgba(150, 50, 40, 0.85);
  font-size: 18px;
  letter-spacing: 0.1em;
}

.toast {
  position: fixed;
  top: calc(var(--safe-top) + 104px);
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--paper);
  color: var(--paper-ink);
  font-family: var(--serif);
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 6px 16px rgba(10, 8, 20, 0.35);
  pointer-events: none;
  animation: toast-in 0.25s ease-out;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translate(-50%, -8px);
  }
}

/* 下部の操作 */
.controls {
  position: fixed;
  left: calc(var(--safe-left) + 10px);
  right: calc(var(--safe-right) + 10px);
  bottom: calc(var(--safe-bottom) + 10px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  width: min(100% - 20px - var(--safe-left) - var(--safe-right), 420px);
  margin-inline: auto;
}
/* アタリの間は「ひく」を目立たせる */
#pull-button.biting { background: linear-gradient(180deg, #c7714f, #a24d33 55%, #7d3522); animation: pull-pulse .5s ease-in-out infinite alternate; }
@keyframes pull-pulse { to { transform: scale(1.04); box-shadow: inset 0 1px 0 rgba(255, 230, 200, .3), 0 0 18px rgba(255, 170, 120, .6), 0 5px 12px rgba(10, 8, 20, .45); } }
@media (prefers-reduced-motion: reduce) { #pull-button.biting { animation: none; } }

.plank {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 14px;
  border: 0;
  border-radius: 10px;
  background:
    repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.07) 0 2px, transparent 2px 8px),
    linear-gradient(180deg, var(--wood-light), var(--wood) 55%, var(--wood-dark));
  color: #fbf1e3;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.12em;
  box-shadow: inset 0 1px 0 rgba(255, 230, 200, 0.25), inset 0 0 0 1px rgba(0, 0, 0, 0.25), 0 5px 12px rgba(10, 8, 20, 0.45);
}

.plank.small {
  font-size: 14px;
  letter-spacing: 0.04em;
  padding: 0 8px;
  gap: 4px;
}

.plank[aria-pressed="true"] {
  background: linear-gradient(180deg, #9fb3d6, #5f7299);
  color: #fff;
}

.plank:disabled {
  filter: grayscale(0.6) brightness(0.7);
  cursor: default;
}

.plank.pressing {
  transform: translateY(2px);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.45);
}

.plank-icon {
  font-size: 1.1em;
  opacity: 0.85;
}

.paper-button {
  min-height: 48px;
  padding: 0 20px;
  border: 0;
  border-radius: 10px;
  background: var(--paper);
  color: var(--paper-ink);
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.1em;
  box-shadow: inset 0 0 0 1px var(--paper-edge), 0 4px 10px rgba(10, 8, 20, 0.3);
}

.paper-button:disabled {
  opacity: 0.55;
  cursor: default;
}

.wide {
  width: 100%;
}

/* 印 */
.bite-mark {
  position: fixed;
  left: 0;
  top: 0;
  transform: translate(-50%, -130%);
  color: #fff;
  font-size: 46px;
  font-weight: 900;
  text-shadow: 0 0 12px rgba(255, 90, 60, 0.9), 0 2px 0 #9b2a20;
  pointer-events: none;
}

/* タイトル */
.title-screen {
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-rows: auto auto 1fr;
  justify-items: center;
  padding: calc(var(--safe-top) + 16px) calc(var(--safe-right) + 16px) calc(var(--safe-bottom) + 16px) calc(var(--safe-left) + 16px);
  background: url("../assets/web/home-bg.webp") center / cover no-repeat, #6b6385;
}

.title-count {
  justify-self: end;
  margin: 0;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--paper);
  color: var(--paper-ink);
  font-family: var(--serif);
  font-size: 13px;
  box-shadow: 0 4px 10px rgba(10, 8, 20, 0.3);
}

.title-count strong {
  font-size: 18px;
}

.title-head {
  display: grid;
  justify-items: center;
  margin-top: 4vh;
  text-align: center;
}

.logo {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(46px, 15vw, 88px);
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.1;
  color: var(--navy);
  text-shadow: 0 0 18px rgba(255, 240, 235, 0.85), 0 0 2px rgba(255, 255, 255, 0.9);
}

.logo-roman {
  margin: 2px 0 0;
  font-family: var(--serif);
  font-size: 11px;
  letter-spacing: 0.6em;
  color: var(--navy);
  opacity: 0.8;
}

.title-lead {
  margin: 10px 0 0;
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--navy);
  text-shadow: 0 0 10px rgba(255, 240, 235, 0.9);
  word-break: auto-phrase;
}

.title-menu {
  display: grid;
  gap: 10px;
  width: min(72vw, 300px);
  align-self: center;
  margin-top: 4vh;
}

.title-menu .plank {
  min-height: 56px;
  font-size: 20px;
}

.title-murmur {
  position: absolute;
  left: calc(var(--safe-left) + 18px);
  top: calc(var(--safe-top) + 18px);
  margin: 0;
  font-family: var(--serif);
  font-size: 12px;
  line-height: 1.8;
  color: rgba(255, 250, 245, 0.9);
  text-shadow: 0 1px 4px rgba(30, 20, 40, 0.6);
}

.title-sound {
  position: absolute;
  left: calc(var(--safe-left) + 16px);
  bottom: calc(var(--safe-bottom) + 16px);
}

.title-sound[aria-pressed="false"] {
  opacity: 0.6;
}

/* 紙のシート */
.sheet {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: calc(var(--safe-top) + 16px) calc(var(--safe-right) + 14px) calc(var(--safe-bottom) + 16px) calc(var(--safe-left) + 14px);
  background: rgba(24, 20, 40, 0.45);
  animation: fade-in 0.3s ease-out;
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
}

.paper {
  position: relative;
  width: min(100%, 420px);
  max-height: 100%;
  overflow: auto;
  padding: 20px 20px 16px;
  border-radius: 6px 10px 8px 12px;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(255, 255, 255, 0.35), transparent 60%),
    radial-gradient(ellipse at 90% 100%, rgba(150, 110, 70, 0.18), transparent 55%),
    var(--paper);
  color: var(--paper-ink);
  font-family: var(--serif);
  box-shadow: inset 0 0 0 1px var(--paper-edge), inset 0 0 40px rgba(140, 100, 60, 0.15), 0 18px 40px rgba(10, 8, 20, 0.5);
  -webkit-user-select: text;
  user-select: text;
}

.paper h2 {
  margin: 4px 0 12px;
  font-size: 21px;
  letter-spacing: 0.05em;
}

.kicker {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: #8a5a3c;
}

.sheet-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 16px;
}

.letter-lines {
  margin: 0;
  padding: 10px 0;
  border-top: 1px solid rgba(90, 70, 50, 0.2);
  border-bottom: 1px solid rgba(90, 70, 50, 0.2);
  background: repeating-linear-gradient(180deg, transparent 0 31px, rgba(120, 90, 60, 0.15) 31px 32px);
}

.letter-lines p {
  margin: 0;
  font-size: 16px;
  line-height: 32px;
  word-break: auto-phrase;
}

.letter-lines p.missing {
  color: rgba(90, 70, 50, 0.4);
  letter-spacing: 0.3em;
}

.letter-from {
  margin: 8px 0 0;
  text-align: right;
  font-size: 15px;
}

.pieces {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--paper-soft);
}

.dots {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 4px;
}

.dots span {
  flex: 1;
  height: 2px;
  background: rgba(90, 70, 50, 0.3);
  position: relative;
}

.dots span::before {
  content: "";
  position: absolute;
  left: -4px;
  top: -4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #b9a68a;
}

.dots span.on::before {
  background: #3f6fa8;
  box-shadow: 0 0 0 3px rgba(63, 111, 168, 0.25);
}

.fish-figure {
  display: block;
  width: 100%;
  height: 180px;
  object-fit: contain;
  margin: 4px 0 6px;
}

.big {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
}

.note {
  margin: 8px 0 0;
  color: var(--paper-soft);
  font-size: 14px;
  line-height: 1.7;
}

.summary {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
  font-size: 16px;
}

.summary li {
  display: flex;
  justify-content: space-between;
  padding: 6px 2px;
  border-bottom: 1px dashed rgba(90, 70, 50, 0.3);
}

.ending-text {
  margin: 0;
  font-size: 16px;
  line-height: 2;
}

.credit {
  margin: 12px 0 0;
  color: var(--paper-soft);
  font-size: 12px;
  line-height: 1.6;
}

.howto-list {
  margin: 0;
  padding-left: 1.4em;
  display: grid;
  gap: 8px;
  font-size: 15px;
  line-height: 1.7;
}

.book {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  gap: 12px;
  max-height: min(100%, 640px);
  overflow: hidden;
}

.book-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.book-head h2 {
  margin: 0;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.tab {
  border: 0;
  border-radius: 8px;
  background: rgba(90, 70, 50, 0.1);
  color: var(--paper-ink);
  font-family: var(--serif);
  font-weight: 700;
}

.tab[aria-selected="true"] {
  background: var(--wood);
  color: #fbf1e3;
}

.panel {
  display: grid;
  align-content: start;
  gap: 8px;
  overflow: auto;
}

.entry {
  display: grid;
  grid-template-columns: 2em 1fr auto;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 52px;
  padding: 8px 10px;
  border: 0;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.4);
  box-shadow: inset 0 0 0 1px rgba(90, 70, 50, 0.18);
  color: var(--paper-ink);
  font-family: var(--serif);
  text-align: left;
}

.entry .num {
  color: #8a5a3c;
  font-weight: 700;
}

.entry .meta {
  color: var(--paper-soft);
  font-size: 13px;
}

.entry.locked {
  color: rgba(58, 47, 39, 0.45);
}

.menu-card {
  display: grid;
  gap: 10px;
  width: min(100%, 320px);
}

.menu-card h2 {
  margin: 0 0 4px;
  text-align: center;
}

.error {
  position: fixed;
  inset: auto 16px calc(var(--safe-bottom) + 16px);
  margin: 0;
  padding: 14px;
  border-radius: 10px;
  background: #5a1d1d;
  line-height: 1.6;
}

@media (orientation: landscape) and (max-height: 520px) {
  /* 横画面では操作ボタンが右下に並ぶので、桟橋とねこを左下に寄せる */
  .cat-pier {
    --pier-x: -14%;
    --pier-y: 12%;
    left: var(--safe-left);
    width: min(48vw, 96vh);
  }
  .controls {
    left: auto;
    width: min(36vw, 300px);
    margin-inline: 0;
  }
  .title-screen {
    grid-template-rows: auto 1fr;
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
  .title-count {
    grid-column: 2;
  }
  .title-head {
    grid-row: 2;
    margin-top: 0;
  }
  .logo {
    font-size: clamp(36px, 13vh, 72px);
  }
  .title-menu {
    grid-row: 2;
    margin-top: 0;
  }
  .fish-figure { height: 100px; }

  .paper {
    padding: 14px 18px 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .toast,
  .sheet {
    animation: none;
  }
}

/* 瓶から紙を取り出し、破れた5枚を一通へ戻す */
.bottle-discovery { position: relative; width: 220px; height: 286px; margin: 12px auto 4px; }
.bottle-body { width: 100%; height: 100%; object-fit: contain; filter: drop-shadow(0 8px 7px rgba(49, 62, 53, .15)); }
.bottle-cork { position: absolute; width: 82px; height: auto; left: 50%; top: -14px; transform: translateX(-50%); }
.bottled-paper { position: absolute; width: 110px; height: 44px; left: 50%; top: 60%; transform: translate(-50%, -50%) rotate(-68deg); opacity: .85; mix-blend-mode: multiply; }
.extracting .bottle-cork { animation: uncork .6s ease-out forwards; }
.extracting .bottled-paper { animation: extract-paper .75s ease-in forwards; }
@keyframes uncork { to { transform: translate(-20%, -35px) rotate(15deg); opacity: 0; } }
@keyframes extract-paper { to { transform: translate(-50%, -185px) rotate(-5deg) scale(1.3); opacity: 0; } }
.fragment-tray { display: grid; gap: 10px; padding: 8px 4px; }
/* 破れた切れ端：形は main.js の clip-path（上下に深い破れ目、左右に小さなささくれ） */
.paper-fragment {
  display: block;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: #4f3b28;
  font: inherit;
  text-align: left;
  transform: rotate(var(--tilt, 0deg));
  filter: drop-shadow(0 2px 1.5px rgba(60, 40, 20, .35)) drop-shadow(0 6px 8px rgba(60, 40, 20, .18));
}
.piece-paper {
  display: block;
  padding: 26px 24px 28px;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255, 250, 232, .5), transparent 60%),
    radial-gradient(ellipse at 85% 95%, rgba(120, 80, 40, .22), transparent 55%),
    url("../assets/web/letter-sheet.webp") center / 160% auto,
    #e6d2a6;
}
.piece-text { display: block; font-size: 15px; line-height: 1.65; white-space: pre-line; overflow-wrap: anywhere; }
button.paper-fragment { cursor: pointer; touch-action: manipulation; }
button.paper-fragment:focus-visible { outline: 3px solid var(--wood); outline-offset: 2px; }
button.paper-fragment:active:not(:disabled) { transform: rotate(var(--tilt, 0deg)) scale(.98); }
.paper-fragment.wrong { animation: piece-wrong .4s ease-out; }
@keyframes piece-wrong { 25% { translate: -8px 0; } 50% { translate: 7px 0; } 75% { translate: -4px 0; } }

/* つなぐ台：上から順に重ね、隣の破れ目を噛み合わせる（重なりは破れ目の深さ 18px） */
.puzzle-board {
  display: grid;
  min-height: 92px;
  padding: 10px 6px;
  border: 1.5px dashed rgba(110, 85, 60, .35);
  border-radius: 8px;
  background: rgba(255, 250, 238, .35);
}
.puzzle-board .paper-fragment { transform: none; animation: piece-snap .35s ease-out; }
.puzzle-board .paper-fragment + .paper-fragment { margin-top: -18px; }
.puzzle-board.joined { border-color: transparent; background: none; }
.puzzle-board.joined .paper-fragment { filter: drop-shadow(0 0 6px rgba(255, 236, 190, .9)); transition: filter .4s; }
@keyframes piece-snap { from { opacity: .3; transform: translateY(14px) scale(.97); } }
.puzzle-empty { align-self: center; margin: 0; text-align: center; color: var(--paper-soft); font-size: 13px; }
.puzzle-status { min-height: 1.7em; text-align: center; }
.puzzle-tray .piece-text { font-size: 14px; line-height: 1.55; }
.extracted .paper-fragment.newest { animation: paper-arrive .5s ease-out; }
@keyframes paper-arrive { from { opacity: 0; translate: 0 -18px; rotate: -5deg; } }
.assembling p { animation: join-paper .9s ease-out both; }
.assembling p:nth-child(2) { --offset: 20px; animation-delay: .06s; }
.assembling p:nth-child(3) { --offset: -14px; animation-delay: .12s; }
.assembling p:nth-child(4) { --offset: 18px; animation-delay: .18s; }
.assembling p:nth-child(5) { --offset: -22px; animation-delay: .24s; }
@keyframes join-paper {
  from { transform: translate(var(--offset, -18px), 16px) rotate(-2deg); background: #ead7ad; clip-path: polygon(0 10%, 15% 0, 35% 8%, 55% 0, 75% 10%, 100% 0, 100% 95%, 80% 100%, 60% 91%, 40% 100%, 20% 92%, 0 100%); }
  to { transform: none; background: transparent; clip-path: polygon(0 0, 15% 0, 35% 0, 55% 0, 75% 0, 100% 0, 100% 100%, 80% 100%, 60% 100%, 40% 100%, 20% 100%, 0 100%); }
}
@media (prefers-reduced-motion: reduce) {
  .cat-pier.casting, .cat-pier.hoisting, .extracting .bottle-cork, .extracting .bottled-paper,
  .extracted .paper-fragment.newest, .assembling p, .paper-fragment.wrong, .puzzle-board .paper-fragment { animation-duration: .01s; animation-delay: 0s; }
}


/* 各言語の長い語・文、3つの入り江の操作を狭い縦横画面へ収める。 */
.title-murmur { top: calc(var(--safe-top) + 230px); white-space: pre-line; max-width: 40vw; }
.language-picker { position: absolute; right: calc(var(--safe-right) + 14px); bottom: calc(var(--safe-bottom) + 14px); display: grid; font-size: 11px; color: var(--navy); }
.language-picker select { min-height: 44px; max-width: 180px; border: 1px solid var(--paper-edge); border-radius: 8px; background: var(--paper); color: var(--paper-ink); font: inherit; font-size: 14px; }
.home-portal-menu { position: absolute; left: calc(var(--safe-left) + 8px); top: calc(var(--safe-top) + 8px); z-index: 3; color: #f7f2e9; }
.home-portal-menu:has(.home-portal[hidden]) { display: none; }
.home-portal-menu summary { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 9px; background: #262630; cursor: pointer; list-style: none; }
.home-portal-menu summary::-webkit-details-marker { display: none; }
.home-portal { display: flex; align-items: center; min-width: 120px; min-height: 44px; padding: 8px 14px; margin-top: 4px; border-radius: 9px; background: #262630; color: inherit; text-decoration: none; font-weight: 700; white-space: nowrap; }
.home-portal-menu summary:focus-visible, .home-portal:focus-visible, select:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.sign { min-width: 0; max-width: 54%; padding: 6px 8px; gap: 4px; }
.sign-text { min-width: 0; gap: 3px; }
.sign-place, .sign-tide { letter-spacing: 0; overflow-wrap: anywhere; }
.sign-place { font-size: 14px; }
.stats { flex-shrink: 0; gap: 4px; }
.stat { min-width: 44px; max-width: 68px; padding: 4px 6px; }
.stat-label { letter-spacing: 0; overflow-wrap: anywhere; text-align: center; }
.hint { top: calc(var(--safe-top) + 91px); }
.toast { max-width: calc(100vw - 28px); white-space: normal; text-align: center; top: calc(var(--safe-top) + 140px); }
.plank, .paper-button, .tab { letter-spacing: .02em; overflow-wrap: anywhere; padding-block: 8px; }
.title-menu { gap: 7px; }
.title-menu .plank { min-height: 50px; }
.title-menu .paper-button { min-height: 44px; }
.paper h2, .title-lead { text-wrap: balance; overflow-wrap: anywhere; }
.entry { grid-template-columns: 1.6em minmax(0, 1fr) auto; }
.entry > span { overflow-wrap: anywhere; }
.entry .meta { max-width: 100px; }
.letter-lines p { overflow-wrap: anywhere; }
.ending-text, .credit { white-space: pre-line; }
#cove-list { display: grid; gap: 10px; }
#cove-list [aria-current="true"] { box-shadow: inset 0 0 0 2px var(--wood); }
#cove-list button:disabled { opacity: .65; }
html:not([lang="ja"]) .logo { font-size: clamp(30px, 9vw, 65px); letter-spacing: .03em; }
@media (max-width: 340px) { .paper { padding-inline: 12px; } .letter-lines { padding-inline: 25px; } .piece-paper { padding-inline: 18px; } }
@media (max-height: 740px) { .title-murmur { display: none; } }
@media (orientation: landscape) and (max-height: 520px) {
  .title-murmur { display: none; }
  .title-menu { gap: 5px; width: min(90%, 300px); }
  .title-menu .plank, .title-menu .paper-button { min-height: 44px; padding-block: 4px; }
  .language-picker { right: auto; left: calc(var(--safe-left) + 70px); max-width: 160px; }
  .language-picker > span { display: none; }
  .title-head { max-width: 95%; }
  .title-lead { margin-top: 6px; }
}

/* 短い横画面でも結果の操作を紙の下端に残す。本文と切れ端はスクロールできる。 */
#reveal .sheet-actions {
  position: sticky;
  bottom: 0;
  padding-top: 8px;
  background: var(--paper);
}

.letter-lines {
  border: 0;
  padding: 40px 34px 36px;
  background: url("../assets/web/letter-sheet.webp") center / 100% 100% no-repeat;
  filter: drop-shadow(0 3px 3px rgba(73, 51, 28, .12));
}
@media (orientation: landscape) and (max-height: 520px) {
  .bottle-discovery { width: 160px; height: 208px; }
  .bottle-cork { width: 60px; top: -10px; }
  .bottled-paper { width: 80px; height: 32px; }
}

.cove-lock-note { display: block; margin-top: 5px; font-size: 12px; font-weight: normal; }
#share-status:empty { display: none; }
@media (orientation: landscape) and (max-height: 520px) {
  #complete .paper { width: min(100%, 560px); padding: 12px 16px; }
  #complete h2 { font-size: 19px; margin: 3px 0 8px; }
  #complete .ending-text { font-size: 16px; line-height: 1.45; margin: 8px 0; }
  #complete .sheet-actions { margin-top: 8px; gap: 8px; }
  #complete button { font-size: 16px; min-height: 44px; padding: 6px 12px; }
  html:not([lang="ja"]) .logo { font-size: clamp(24px, 4.5vw, 42px); }
  .title-screen { grid-template-rows: 1fr; padding-top: calc(var(--safe-top) + 8px); padding-bottom: calc(var(--safe-bottom) + 8px); }
  .title-head, .title-menu { grid-row: 1; }
  .title-head { min-width: 0; width: 90%; }
  .title-count { position: absolute; grid-column: auto; grid-row: auto; right: auto; left: calc(var(--safe-left) + 62px); top: calc(var(--safe-top) + 8px); z-index: 2; }
  .title-menu { margin-top: 0; max-height: 100%; overflow-y: auto; }
}

/* ホーム画面: ねこの待つ桟橋の絵を主役にし、題字・主操作・小さな3項目へ整理する。 */
.title-screen {
  grid-template-rows: auto auto 1fr auto;
  /* 画面より広い背景の絵で、フォーカス移動時に横へスクロールさせない。 */
  overflow: hidden;
  overflow: clip;
  isolation: isolate;
  background: #6b6385;
}
/* 背景の絵とゆらぐ光を同じ座標系に置く。縦画面は下端合わせで、ねこをボタンの上に見せる。 */
.title-art {
  position: absolute; z-index: -2; left: 50%; bottom: 0;
  height: max(108%, 162vw); aspect-ratio: 2 / 3;
  /* 細い縦画面でも右奥の灯台とねこを両方残す。 */
  transform: translateX(-54%);
  pointer-events: none;
}
.title-art::before {
  content: ""; position: absolute; inset: 0;
  background: url("../assets/web/home-bg.webp") center / 100% 100% no-repeat;
  transform-origin: 50% 62%;
  animation: title-drift 40s ease-in-out infinite alternate;
}
/* 題字とボタンの下だけ、絵を少し落ち着かせる。 */
.title-screen::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(120% 30% at 50% 13%, rgba(255, 244, 236, .5), transparent 70%),
    linear-gradient(to top, rgba(30, 24, 38, .66), rgba(30, 24, 38, .18) 24%, transparent 36%);
}
@keyframes title-drift { from { transform: scale(1); } to { transform: scale(1.025); } }
.title-art i { position: absolute; display: block; border-radius: 50%; }
/* 夕日の道のきらめき */
.title-shimmer {
  left: 18%; width: 26%; top: 40%; height: 18%;
  border-radius: 0 !important;
  background: repeating-linear-gradient(180deg, rgba(255, 226, 205, 0) 0 9px, rgba(255, 232, 214, .55) 9px 10px, rgba(255, 226, 205, 0) 10px 19px);
  -webkit-mask-image: radial-gradient(50% 50% at 50% 35%, #000 0, transparent 100%);
  mask-image: radial-gradient(50% 50% at 50% 35%, #000 0, transparent 100%);
  mix-blend-mode: screen;
  opacity: .5;
  animation: title-shimmer 6s linear infinite;
}
@keyframes title-shimmer { from { background-position: 0 0; } to { background-position: 0 38px; } }
.title-lantern, .title-beacon { width: 1px; height: 1px; }
.title-lantern { left: 29.6%; top: 70.5%; box-shadow: 0 0 30px 20px rgba(255, 188, 105, .3); animation: title-flicker 3.2s ease-in-out infinite; }
.title-beacon { left: 83.6%; top: 34.6%; box-shadow: 0 0 12px 7px rgba(255, 238, 186, .6); animation: title-beacon 4.5s ease-in-out infinite; }
@keyframes title-flicker { 0%, 100% { opacity: .9; } 18% { opacity: .6; } 22% { opacity: 1; } 55% { opacity: .76; } 70% { opacity: .95; } }
@keyframes title-beacon { 0%, 100% { opacity: .3; } 50% { opacity: 1; } }

.title-count {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px 6px 9px;
  border: 1px solid rgba(255, 246, 232, .55);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(250, 242, 228, .92), rgba(236, 222, 198, .9));
  box-shadow: 0 6px 16px rgba(30, 22, 40, .28), inset 0 1px 0 #fffaf2;
}
.title-count-icon { width: 18px; height: 18px; fill: rgba(126, 170, 172, .35); stroke: #4f6c74; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }

.title-head { position: relative; margin-top: clamp(8px, 3.2vh, 34px); }
.logo {
  background: linear-gradient(180deg, #2e3e67 0%, #26345a 55%, #4a3f63 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  text-shadow: none;
  filter: drop-shadow(0 0 10px rgba(255, 243, 236, .9)) drop-shadow(0 2px 1px rgba(255, 255, 255, .7));
}
.logo-roman { margin-top: 4px; letter-spacing: .62em; padding-left: .62em; }
.logo-wave { width: min(62vw, 230px); height: 18px; margin: 8px 0 2px; overflow: visible; fill: none; stroke: #9c7a55; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; filter: drop-shadow(0 0 4px rgba(255, 244, 236, .9)); }
.logo-wave g { fill: rgba(170, 214, 214, .55); stroke: #6f8c90; }
.logo-wave g path { stroke: #9c7a55; }
.title-lead { margin-top: 6px; font-size: 14.5px; }

.title-menu {
  grid-row: 4;
  align-self: end;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  width: min(88vw, 360px);
  margin: 0 0 calc(58px + 4px);
  gap: 8px;
}
.title-menu .plank {
  position: relative;
  min-height: 60px;
  border-radius: 14px;
  font-size: 21px;
  letter-spacing: .18em;
  box-shadow: inset 0 1px 0 rgba(255, 230, 200, .3), inset 0 0 0 1px rgba(0, 0, 0, .25), 0 0 0 2px rgba(243, 201, 139, .55), 0 8px 18px rgba(10, 8, 20, .45);
}
.title-menu .plank::before, .title-menu .plank::after {
  content: ""; position: absolute; top: 50%; width: 7px; height: 7px; margin-top: -3.5px;
  border-radius: 50%; background: radial-gradient(circle at 35% 35%, #f2d7a6, #8c6440);
  box-shadow: 0 1px 1px rgba(0, 0, 0, .4);
}
.title-menu .plank::before { left: 14px; }
.title-menu .plank::after { right: 14px; }
.title-menu .paper-button {
  min-height: 60px;
  padding-inline: 8px;
  letter-spacing: .04em;
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(250, 243, 230, .96), rgba(234, 219, 192, .94));
  box-shadow: inset 0 0 0 1px var(--paper-edge), inset 0 1px 0 #fffaf2, 0 6px 14px rgba(10, 8, 20, .3);
}
.title-menu .paper-button:disabled { opacity: .5; }
.title-sub { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.title-tile {
  display: grid; justify-items: center; align-content: center; gap: 3px;
  min-height: 66px; padding: 7px 4px 6px;
  border: 1px solid rgba(255, 246, 232, .35);
  border-radius: 14px;
  background: rgba(36, 30, 50, .52);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  color: #f8efe2;
  font-family: var(--serif);
  font-size: 12.5px; font-weight: 600; line-height: 1.2; letter-spacing: .02em;
  overflow-wrap: break-word; word-break: normal; -webkit-hyphens: auto; hyphens: auto; text-align: center;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .14), 0 6px 14px rgba(10, 8, 20, .28);
}
/* ラテン文字の言語では題字が英字なので、同じ綴りの小見出しを重ねない。 */
html:is(:lang(en), :lang(es), :lang(fr), :lang(de), :lang(pt)) .logo-roman { display: none; }
.title-tile svg { width: 24px; height: 24px; fill: none; stroke: #f3c98b; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.title-tile:active, .title-menu .paper-button:active { transform: translateY(1px); }
.title-sound { bottom: calc(var(--safe-bottom) + 14px); }
.language-picker { bottom: calc(var(--safe-bottom) + 14px); }
.language-picker > span { display: none; }
.language-picker select { min-width: 132px; border-radius: 999px; padding: 0 12px; background: rgba(250, 243, 230, .94); }
.title-murmur { top: auto; bottom: calc(var(--safe-bottom) + 330px); }

@media (max-height: 700px) {
  .title-menu { gap: 7px; }
  .title-menu .plank, .title-menu .paper-button { min-height: 52px; }
  .title-tile { min-height: 56px; }
  .title-lead { font-size: 13px; }
}
@media (orientation: landscape) and (max-height: 520px) {
  .title-screen { grid-template-rows: auto 1fr; grid-template-columns: 1fr 1fr; }
  .title-screen::after { background: linear-gradient(to left, rgba(30, 24, 38, .5), transparent 50%); }
  /* 横長では海・瓶・ねこが並ぶ帯を見せ、題字は和紙の札に載せて読みやすくする。 */
  .title-art { top: 50%; bottom: auto; height: max(100%, 150vw); transform: translate(-50%, -53%); }
  .title-head { grid-row: 2; grid-column: 1; align-self: center; justify-self: center; padding: 12px 18px 14px; border-radius: 18px; background: rgba(250, 243, 232, .78); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); box-shadow: 0 8px 20px rgba(20, 14, 30, .3); }
  .title-menu { grid-row: 2; grid-column: 2; align-self: center; margin: 0; width: min(90%, 330px); }
  .title-menu .plank, .title-menu .paper-button { min-height: 48px; }
  .title-tile { min-height: 52px; gap: 2px; padding-block: 4px; font-size: 11.5px; }
  .title-tile svg { width: 19px; height: 19px; }
  .logo-wave { margin-top: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  .title-art::before, .title-art i { animation: none; }
}
/* 主ボタンの語を途中で折らない。字間は日本語だけ広めにする。 */
.title-menu .plank { padding-inline: 24px; font-size: clamp(16px, 5.4vw, 21px); letter-spacing: .05em; white-space: nowrap; overflow-wrap: normal; }
html:lang(ja) .title-menu .plank { letter-spacing: .18em; }
.title-menu .paper-button { white-space: normal; overflow-wrap: normal; word-break: normal; -webkit-hyphens: auto; hyphens: auto; }

/* 日本語は文節の間（phrase.mjs が入れる <wbr>）でだけ改行する。韓国語は語の途中で折らない。 */
html:lang(ja) body { word-break: keep-all; overflow-wrap: anywhere; line-break: strict; }
html:lang(ko) body { word-break: keep-all; overflow-wrap: anywhere; }
html:lang(ja) :is(.howto-list, .note, .ending-text, .letter-lines p, .paper h2) { text-wrap: pretty; }

/* 本文が長いときも、下に固定した操作の帯を紙の地となじませる */
#reveal .sheet-actions {
  padding-top: 14px;
  background: linear-gradient(180deg, rgba(239, 227, 205, 0), rgba(239, 227, 205, 0.96) 14px);
}

/* 完成画面：主の操作を1つ、補助を2つ、移動は控えめな文字の操作にする */
.complete-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 18px; }
.complete-actions > .plank, .complete-actions > .paper-button { width: 100%; padding-inline: 8px; }
.complete-actions > #complete-next { grid-column: 1 / -1; }
.complete-links {
  grid-column: 1 / -1;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin-top: 2px;
  padding-top: 6px;
  border-top: 1px dashed rgba(90, 70, 50, 0.3);
}
.text-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 8px;
  border: 0;
  background: none;
  color: var(--paper-soft);
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-align: center;
}
.text-button[hidden] { display: none; }
a.text-button::after { content: "→"; margin-left: 6px; }
.text-button:active { color: var(--paper-ink); }
.text-button:focus-visible { outline: 2px solid var(--wood); outline-offset: 2px; border-radius: 6px; }
@media (orientation: landscape) and (max-height: 520px) {
  #complete .complete-actions { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 8px; }
  #complete .complete-actions > #complete-next { grid-column: auto; }
  #complete .complete-actions > #complete-next[hidden] + #complete-share { grid-column: 1 / 3; }
  #complete .complete-links { padding-top: 2px; }
}
#complete-heading:focus { outline: none; }
.credit { overflow-wrap: normal; }

/* 横画面のパズルは、つなぐ台と切れ端を左右に並べ、それぞれをスクロールできるようにする */
@media (orientation: landscape) and (max-height: 520px) {
  #reveal .paper:has(.puzzle) { width: min(100%, 780px); }
  .puzzle { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px; align-items: start; }
  .puzzle-side, .puzzle-tray { max-height: calc(100dvh - var(--safe-top) - var(--safe-bottom) - 170px); overflow-y: auto; overscroll-behavior: contain; }
  .puzzle-side { padding: 2px; }
}

/* 起動時の読み込み画面：夜の海に瓶が揺れる。画像がそろうとタイトルへ切り替わる */
.loading {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 14px;
  padding: calc(var(--safe-top) + 24px) calc(var(--safe-right) + 24px) calc(var(--safe-bottom) + 24px) calc(var(--safe-left) + 24px);
  background:
    radial-gradient(ellipse at 50% 18%, rgba(255, 214, 170, .22), transparent 55%),
    linear-gradient(180deg, #3b3a5c 0%, #2b2d48 55%, #1f2238 100%);
  color: #f6ecdc;
  text-align: center;
  transition: opacity .45s ease;
}
.loading.done { opacity: 0; pointer-events: none; }
.loading-art {
  width: min(240px, 62vw);
  height: auto;
  transform-origin: 50% 70%;
  animation: bottle-bob 3.2s ease-in-out infinite;
}
@keyframes bottle-bob { 0%, 100% { transform: translateY(0) rotate(-3deg); } 50% { transform: translateY(6px) rotate(3deg); } }
.loading-logo { margin: 0; font-family: var(--serif); font-size: clamp(30px, 9vw, 44px); font-weight: 700; letter-spacing: .14em; color: #f6ecdc; }
.loading-bar { width: min(240px, 70vw); height: 6px; border-radius: 999px; background: rgba(246, 236, 220, .18); overflow: hidden; }
.loading-bar i { display: block; width: 0; height: 100%; border-radius: inherit; background: linear-gradient(90deg, #d9b98a, #f6ecdc); transition: width .25s ease; }
.loading-status { margin: 0; font-family: var(--serif); font-size: 14px; letter-spacing: .08em; color: rgba(246, 236, 220, .85); font-variant-numeric: tabular-nums; }
.loading-status[hidden], .loading-failed[hidden] { display: none; }
.loading-failed { display: grid; justify-items: center; gap: 10px; max-width: 320px; }
.loading-failed p { margin: 0; font-family: var(--serif); font-size: 14px; line-height: 1.7; }
.loading-failed .text-button { color: #f6ecdc; }
@media (prefers-reduced-motion: reduce) { .loading-art { animation: none; } .loading { transition: none; } }