/* 画面はキャンバス一枚。UI は最小限、文字は縦書き。 */

:root {
  --ink: #efe6d6;
  --night: #0a0c18;
  --paper: #efe4c8;
  --paper-ink: #2b2118;
  --serif: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", "Noto Serif CJK JP", serif;
}

html, body {
  margin: 0;
  height: 100%;
  background: var(--night);
  overflow: hidden;
  font-family: var(--serif);
  color: var(--ink);
  -webkit-user-select: none;
  user-select: none;
}

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

button {
  font: inherit;
  font-size: 14px;
  color: var(--ink);
  background: rgba(10, 12, 24, .6);
  border: 1px solid rgba(239, 230, 214, .45);
  border-radius: 4px;
  padding: .5em 1.2em;
  cursor: pointer;
}
button:hover, button:focus-visible { border-color: var(--ink); background: rgba(20, 24, 40, .75); outline: none; }
button:focus-visible { box-shadow: 0 0 0 2px rgba(239, 230, 214, .4); }
button:disabled { opacity: .45; cursor: progress; }

/* ---------- 開始画面 ---------- */
.start {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  box-sizing: border-box;
  background: rgba(6, 7, 16, .72);
  transition: opacity 1s ease;
}
.start.gone { opacity: 0; pointer-events: none; }
.start-inner { max-width: 32em; }
.start h1 {
  margin: 0 0 .5em;
  font-weight: normal;
  font-size: 28px;
  letter-spacing: .1em;
}
.lead { margin: 0 0 1.6em; font-size: 15px; line-height: 1.9; opacity: .85; }
.controls {
  margin: 0 0 2em;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.9;
  opacity: .75;
}
.controls li { display: flex; gap: 1em; }
.controls b { flex: none; width: 4em; font-weight: normal; opacity: .8; }
#startBtn { font-size: 15px; padding: .7em 1.8em; }

/* ---------- HUD ---------- */
.hud { position: fixed; inset: 0; pointer-events: none; }
.progress {
  position: absolute;
  top: max(16px, env(safe-area-inset-top));
  left: 18px;
  margin: 0;
  font-size: 13px;
  letter-spacing: .12em;
  opacity: .65;
  text-shadow: 0 0 10px rgba(0, 0, 0, .9);
  transition: opacity .6s, color .6s;
}
.progress.done { color: #ffd9a3; }

.prompt {
  position: absolute;
  left: 50%;
  bottom: max(28px, calc(env(safe-area-inset-bottom) + 20px));
  transform: translate(-50%, 8px);
  display: flex;
  align-items: center;
  gap: .8em;
  opacity: 0;
  transition: opacity .35s, transform .35s;
}
.prompt.show { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }
.spot {
  font-size: 18px;
  letter-spacing: .12em;
  text-shadow: 0 0 12px rgba(0, 0, 0, .95);
  margin-right: .6em;
}

.stick {
  position: absolute;
  width: 110px;
  height: 110px;
  margin: -55px 0 0 -55px;
  border-radius: 50%;
  border: 1px solid rgba(239, 230, 214, .35);
  opacity: 0;
  transition: opacity .2s;
}
.stick.on { opacity: 1; }
.knob {
  position: absolute;
  left: 50%; top: 50%;
  width: 44px; height: 44px;
  margin: -22px 0 0 -22px;
  border-radius: 50%;
  background: rgba(239, 230, 214, .35);
}

/* ---------- 立て札 ---------- */
/* 屋根・板・脚・閉じるボタンを一本の縦の流れにして、まとめて中央に置く */
.fuda {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 54px;
  padding: 24px;
  box-sizing: border-box;
  background: rgba(4, 5, 12, .66);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s;
}
.fuda.open { opacity: 1; pointer-events: auto; }

/* 幅は JS が本文の実寸から決める。内容任せにすると、屋根の負のマージンが
   幅の計算に絡んで中央がずれる */
.fuda-frame {
  position: relative;
  flex: none;
  max-width: 100%;
  filter: drop-shadow(0 20px 30px rgba(0, 0, 0, .72));
  transform: translateY(12px);
  transition: transform .35s cubic-bezier(.2, .9, .3, 1);
}
.fuda.open .fuda-frame { transform: translateY(0); }

/* 小屋根: 棟 + 板厚のある屋根面。軒は両端を斜めに落とす */
.fuda-roof {
  position: relative;
  height: 27px;
  margin: 0 -32px;
}
.fuda-roof::before {
  content: "";
  position: absolute;
  inset: 9px 0 0;
  background: linear-gradient(#463f35 0 3px, #2b261f 3px 55%, #14120d);
  clip-path: polygon(0 100%, 20px 0, calc(100% - 20px) 0, 100% 100%);
}
.fuda-roof::after {
  content: "";
  position: absolute;
  left: 26px; right: 26px; top: 0;
  height: 12px;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(#564e42, #26211a);
  box-shadow: 0 1px 0 rgba(0, 0, 0, .5);
}

/* 濃い木の枠。縦の木目と、上端が光り下端が落ちる面取り */
.fuda-board {
  position: relative;
  width: 100%;
  box-sizing: border-box;
  height: 60vh;
  max-height: 560px;
  padding: 22px 24px 26px;
  background:
    repeating-linear-gradient(90deg, rgba(0, 0, 0, .11) 0 1px, transparent 1px 5px),
    repeating-linear-gradient(90deg, rgba(255, 228, 178, .05) 0 1px, transparent 1px 19px),
    linear-gradient(#6d5537, #4a3824);
  box-shadow:
    inset 0 1px 0 rgba(255, 234, 190, .2),
    inset 0 -2px 0 rgba(0, 0, 0, .45),
    inset 2px 0 0 rgba(255, 228, 178, .06),
    inset -2px 0 0 rgba(0, 0, 0, .3);
}

/* 白木の面。枠に落ち込んで見えるよう、内側に影を付ける */
.fuda-inner {
  height: 100%;
  width: 100%;
  box-sizing: border-box;
  padding: 24px 30px;
  background:
    repeating-linear-gradient(91deg, rgba(122, 92, 50, .07) 0 1px, transparent 1px 6px),
    repeating-linear-gradient(90deg, rgba(96, 68, 36, .10) 0 1px, transparent 1px 13px),
    repeating-linear-gradient(89.6deg, rgba(80, 56, 28, .08) 0 2px, transparent 2px 41px),
    radial-gradient(ellipse at 32% 14%, rgba(255, 250, 228, .45), transparent 62%),
    linear-gradient(92deg, #cbb791, #e2d5b3 24%, #e8dcbe 58%, #cfbc96);
  color: #241c14;
  font-size: clamp(14px, 1.55vw, 17px);
  line-height: 2.1;
  letter-spacing: .1em;
  box-shadow:
    inset 0 0 0 1px rgba(62, 42, 18, .4),
    inset 0 4px 9px rgba(44, 28, 10, .32),
    inset 0 -3px 7px rgba(44, 28, 10, .22),
    inset 0 0 44px rgba(122, 88, 40, .16);
  /* 外は横書きのまま容器にして、中身だけを縦書きにする */
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior: contain;
}
.fuda-text { height: 100%; width: max-content; writing-mode: vertical-rl; }
.fuda-inner::-webkit-scrollbar { height: 6px; }
.fuda-inner::-webkit-scrollbar-thumb { background: rgba(90, 64, 30, .35); border-radius: 3px; }
.fuda-title {
  margin: 0 0 0 1.25em;
  font-weight: normal;
  font-size: 1.5em;
  letter-spacing: .3em;
  line-height: 1.4;
}
.fuda-body p { margin: 0 0 0 1em; }
.fuda-body p:last-child { margin-left: 0; }

/* 脚。枠の下から二本 */
.fuda-legs { position: absolute; left: 0; right: 0; top: 100%; height: 28px; }
.fuda-legs span {
  position: absolute;
  top: -2px;
  width: 16px;
  height: 100%;
  background: linear-gradient(90deg, #211a11, #4c3a24 42%, #2a2016);
  box-shadow: 0 2px 5px rgba(0, 0, 0, .55);
}
.fuda-legs span:first-child { left: 24%; }
.fuda-legs span:last-child { right: 24%; }

.fuda .close { flex: none; }

/* ---------- 巻物 (本殿) ---------- */
/* 枠は必ず画面に収める。入りきらない本文は、紙が軸の間を送られる (.paper 側でスクロール) */
.scroll {
  position: fixed;
  inset: 0;
  display: flex;
  padding: 0 clamp(16px, 4vw, 70px);
  box-sizing: border-box;
  overflow: hidden;
  background: rgba(4, 5, 12, .55);
  opacity: 0;
  pointer-events: none;
  transition: opacity .4s;
  -webkit-overflow-scrolling: touch;
}
.scroll.open { opacity: 1; pointer-events: auto; }
/* 参考: 横長の表装。緑地に金の唐草の縁、左に表紙 (題箋)、両端に木の軸、右に房 */
.scroll-frame {
  margin: auto;
  --edge: 22px;
  --rollW: 92px;
  --leaf: url("data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20width=%2264%22%20height=%2264%22%20viewBox=%220%200%2064%2064%22%3E%3Crect%20width=%2264%22%20height=%2264%22%20fill=%22%232b6a5e%22/%3E%3Cg%20fill=%22none%22%20stroke=%22%23c9a94b%22%20stroke-width=%221.6%22%20stroke-linecap=%22round%22%3E%3Cpath%20d=%22M0%2032c12-14%2020%2014%2032%200s20-14%2032%200%22/%3E%3Cpath%20d=%22M32%200c-14%2012%2014%2020%200%2032s-14%2020%200%2032%22/%3E%3Cpath%20d=%22M8%2018c4-6%2010-6%2012%200M44%2046c4-6%2010-6%2012%200M46%2012c-2%206%202%2010%208%208M10%2044c6%202%2010-2%208-8%22/%3E%3C/g%3E%3Cg%20fill=%22%23cfae4e%22%3E%3Cpath%20d=%22M16%2016c0-8%208-12%2014-8-2%208-8%2012-14%208zM48%2048c0-8%208-12%2014-8-2%208-8%2012-14%208zM48%2016c-8%200-12%208-8%2014%208-2%2012-8%208-14zM16%2048c-8%200-12%208-8%2014%208-2%2012-8%208-14z%22/%3E%3Cpath%20d=%22M32%2026c-4%200-6%204-6%206s2%206%206%206%206-4%206-6-2-6-6-6z%22%20opacity=%22.9%22/%3E%3C/g%3E%3Cg%20fill=%22%23e3c76a%22%20opacity=%22.8%22%3E%3Ccircle%20cx=%224%22%20cy=%224%22%20r=%221.6%22/%3E%3Ccircle%20cx=%2260%22%20cy=%2260%22%20r=%221.6%22/%3E%3Ccircle%20cx=%2260%22%20cy=%224%22%20r=%221.6%22/%3E%3Ccircle%20cx=%224%22%20cy=%2260%22%20r=%221.6%22/%3E%3C/g%3E%3C/svg%3E");
  position: relative;
  flex: none;
  height: 66vh;
  max-height: 640px;
  filter: drop-shadow(0 26px 40px rgba(0, 0, 0, .75));
}
.mount {
  position: relative;
  z-index: 1;
  display: flex;
  height: 100%;
  padding: var(--edge) 14px var(--edge) 0;
  box-sizing: border-box;
  background: var(--leaf);
  background-size: 48px 48px;
  box-shadow: inset 0 0 0 2px #d8b855, inset 0 0 0 4px #2b6a5e, inset 0 0 0 5px #b8963f;
}
.paper {
  flex: none;
  height: 100%;
  box-sizing: border-box;
  padding: 26px 40px 26px calc(var(--rollW) * 0.55 + 34px);
  background: #eee5cc url("data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20width=%22300%22%20height=%22300%22%3E%3Cfilter%20id=%22n%22%3E%3CfeTurbulence%20type=%22fractalNoise%22%20baseFrequency=%22.9%22%20numOctaves=%223%22%20stitchTiles=%22stitch%22/%3E%3CfeColorMatrix%20values=%220%200%200%200%20.45%200%200%200%200%20.38%200%200%200%200%20.25%200%200%200%20.18%200%22/%3E%3C/filter%3E%3Crect%20width=%22300%22%20height=%22300%22%20filter=%22url%28%23n%29%22/%3E%3C/svg%3E");
  box-shadow: inset 0 0 40px rgba(120, 90, 40, .12), inset 0 0 0 1.5px #d8b855;
  color: var(--paper-ink);
  position: relative;
  font-size: clamp(14px, 1.6vw, 17px);
  line-height: 2.15;
  letter-spacing: .1em;
  /* 縦書きの要素自身をスクロール容器にすると scrollLeft の向きが曖昧になるので、
     外は横書きのまま容器にして、中身だけを縦書きにする */
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior: contain;
}
.paper::-webkit-scrollbar { height: 6px; }
.paper::-webkit-scrollbar-thumb { background: rgba(90, 64, 30, .4); border-radius: 3px; }
.paper .inner { height: 100%; width: max-content; writing-mode: vertical-rl; }
.mount::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: calc(var(--rollW) * 0.55 + 46px);
  background: linear-gradient(90deg, rgba(0,0,0,.55), rgba(0,0,0,.3) 55%, transparent);
  pointer-events: none;
}
.paper h2 {
  margin: 0 0 0 1.4em;
  font-weight: normal;
  font-size: 1.7em;
  letter-spacing: .35em;
  line-height: 1.4;
}
.paper .body p { margin: 0 0 0 1.1em; }
.paper .body p:last-child { margin-left: 0; }

/* 左の巻き: 紙が芯に何重にも巻かれた太い筒。柄は端へ行くほど詰めて円筒に見せ、上下は芯が覗く */
.roll {
  position: absolute;
  top: -6px;
  bottom: -6px;
  width: var(--rollW);
  margin-left: calc(var(--rollW) * -0.55);
  z-index: 2;
}
.roll .skin {
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: 50% / 9px;
  background:
    linear-gradient(90deg, rgba(0,0,0,.75), rgba(0,0,0,.4) 14%, rgba(255,255,255,0) 32%, rgba(255,255,255,.18) 44%, rgba(255,255,255,0) 58%, rgba(0,0,0,.35) 80%, rgba(0,0,0,.75)),
    linear-gradient(rgba(20,60,50,.35), rgba(20,60,50,.35)),
    var(--leaf);
  background-size: auto, auto, 32px 32px;
  box-shadow: 0 12px 24px rgba(0, 0, 0, .75), inset 0 3px 3px rgba(255,255,255,.12), inset 0 -3px 4px rgba(0,0,0,.35);
}
/* 芯の木の軸。筒の裏側に置き、上下にはみ出た分だけ見える */
.roll::before, .roll::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 24px; height: 34px;
  margin-left: -12px;
  z-index: 0;
  border-radius: 5px;
  background: linear-gradient(90deg, #4a2e14, #b4844a 40%, #8a5e2c 65%, #3c2410);
  box-shadow: 0 2px 4px rgba(0,0,0,.6);
}
.roll::before { top: -20px; }
.roll::after { bottom: -20px; }
/* 右端の房: 縁から輪になった紐が下がって房に */
.tassel {
  position: absolute;
  left: calc(100% - 6px); top: 36%;
  width: 96px; height: 160px;
  z-index: 3;
  background: url("data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 width=%22120%22 height=%22200%22 viewBox=%220 0 120 200%22%3E%0A%3Cdefs%3E%3ClinearGradient id=%22c%22 x1=%220%22 x2=%221%22%3E%3Cstop offset=%220%22 stop-color=%22%238f2a24%22/%3E%3Cstop offset=%22.5%22 stop-color=%22%23d9583f%22/%3E%3Cstop offset=%221%22 stop-color=%22%238f2a24%22/%3E%3C/linearGradient%3E%3C/defs%3E%0A%3Cpath d=%22M0 20c30-14 58-10 62 10s-26 34-10 52c14 16 40 6 44-10%22 fill=%22none%22 stroke=%22%237a1f1a%22 stroke-width=%229%22 stroke-linecap=%22round%22/%3E%0A%3Cpath d=%22M0 20c30-14 58-10 62 10s-26 34-10 52c14 16 40 6 44-10%22 fill=%22none%22 stroke=%22url%28%23c%29%22 stroke-width=%226%22 stroke-linecap=%22round%22/%3E%0A%3Cpath d=%22M96 72c-2 18-6 30-10 42%22 stroke=%22%237a1f1a%22 stroke-width=%229%22 stroke-linecap=%22round%22 fill=%22none%22/%3E%0A%3Cpath d=%22M96 72c-2 18-6 30-10 42%22 stroke=%22url%28%23c%29%22 stroke-width=%226%22 stroke-linecap=%22round%22 fill=%22none%22/%3E%0A%3Crect x=%2276%22 y=%22110%22 width=%2220%22 height=%2214%22 rx=%224%22 fill=%22%23c9a94b%22 stroke=%22%237a5a1a%22 stroke-width=%221.5%22/%3E%0A%3Cpath d=%22M78 124l-8 60M82 124l-3 62M86 124l2 62M90 124l6 60M94 124l10 58%22 stroke=%22%23a83428%22 stroke-width=%223.2%22 stroke-linecap=%22round%22/%3E%0A%3Cpath d=%22M80 124l-6 58M84 124l-1 60M88 124l4 60M92 124l8 58%22 stroke=%22%23d9583f%22 stroke-width=%222%22 stroke-linecap=%22round%22/%3E%0A%3C/svg%3E") no-repeat;
  background-size: contain;
  filter: drop-shadow(0 4px 4px rgba(0,0,0,.5));
  pointer-events: none;
}

/* 枠の中に置くと横スクロールで一緒に流れるので、画面に対して固定する */
.scroll .close {
  position: fixed;
  left: 50%;
  bottom: max(26px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
}

/* ---------- WebGL 不可 ---------- */
.fallback {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 2em;
  text-align: center;
  line-height: 2;
}
.fallback[hidden] { display: none; }

@media (max-width: 640px) {
  .scroll { padding: 0 10px; }
  .tassel { display: none; }
  .scroll-frame { height: 70vh; max-height: none; --edge: 14px; --rollW: 52px; }
  .fuda { gap: 30px; padding: 12px 10px; }
  .fuda-roof { height: 20px; margin: 0 -20px; }
  .fuda-roof::before { inset: 7px 0 0; }
  .fuda-roof::after { left: 16px; right: 16px; height: 9px; }
  .fuda-board { height: 72vh; max-height: none; padding: 11px 12px 13px; }
  .fuda-inner { padding: 14px 15px; font-size: 13px; line-height: 1.95; }
  .fuda-legs { height: 20px; }
  .fuda-legs span { width: 10px; }
  .paper { padding: 16px 20px; font-size: 13px; line-height: 1.95; }
  .spot { font-size: 18px; }
  .prompt { flex-wrap: wrap; justify-content: center; width: 90vw; }
  .start h1 { font-size: 24px; }
  .lead { font-size: 14px; }
  .controls { font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .start, .prompt, .scroll, .fuda, .fuda-frame, .stick { transition: none; }
}