/* 開封ページ(受け手の画面と、持ち主のプレビュー)の見た目と演出。
   2026-11-08 SENA承認の見本(Letap デザイン)に合わせた。
   しくみ:手紙の紙(#letter)は最初から画面と同じ大きさで、transform の縮小と clip-path で封筒の中に入れておく。
   封を切ると、紙がせり上がり、封筒が下へ去るのと同時に縮小をほどいて、そのまま中身のページになる(画面の切り替えなし)。
   位置と縮小率は画面の大きさから letter-view.js の layout() が計算して、#stage の CSS 変数に入れる。 */

/* ===== 色(ここ1か所を変えると切り替わる。候補は README の「開封ページの色」) ===== */
:root {
  /* 深めのローズ(既定) */
  --pal-bg: #F2EDE4;     /* 背景 */
  --pal-env: #A6808E;    /* 封筒 */
  --pal-deep: #7A5866;   /* 影・暗くなるところ */
  --pal-lining: #D9B4BB; /* 封筒の内側(ふたの裏) */
}

:root {
  color-scheme: light;
  /* 送り手の編集画面(同じページに出る)が使う色。開封の見た目には使わない */
  --bg: #f6efe6;
  --bg-deep: #efe3d4;
  --ink: #3d2f2a;
  --muted: #8a7468;
  --line: #e4d6c6;
  --paper: #fffaf3;
  --accent: #b5473f;
  --font-hand: "Klee One", "Hiragino Mincho ProN", serif;
  --font-ui: "Zen Kaku Gothic New", "Hiragino Sans", system-ui, sans-serif;

  /* 開封の見た目 */
  --l-paper: #FFFDF8;
  --l-ink: #3A3330;
  --l-sub: #8A7D76;
  --l-gold: #A88745;
  --l-gold-line: #C9A762;
  --f-letter: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --f-letter-ui: "BIZ UDPGothic", "Hiragino Sans", "Yu Gothic", sans-serif;
  --grain: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .35  0 0 0 0 .3  0 0 0 0 .25  0 0 0 .55 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  --t: 1; /* 演出の速さの倍率。動きを減らす設定では小さくする(letter-view.js の時間も同じ倍率) */
}
@media (prefers-reduced-motion: reduce) {
  :root { --t: 0.15; }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  min-height: 100svh;
  background-color: var(--pal-bg);
  background-image: var(--grain);
  background-blend-mode: multiply;
  color: var(--l-ink);
  font-family: var(--f-letter-ui);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}
/* 持ち主の編集画面は、これまでどおりの背景 */
body.ui-editor {
  background: radial-gradient(120% 80% at 50% 0%, #fbf6ef 0%, var(--bg) 55%, var(--bg-deep) 100%);
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
}
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

#app { max-width: 480px; margin: 0 auto; padding: 0 16px; }

/* 読みこみ中:文字は出さない(読み上げには伝える) */
.loading { min-height: 100svh; display: flex; align-items: center; justify-content: center; margin: 0; }
.loading-mark {
  width: 10px; height: 10px; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #E3CD8E, #A9843F);
  opacity: .5; animation: breathe 1.6s ease-in-out infinite;
}
@keyframes breathe { 0%, 100% { opacity: .25; transform: scale(.9); } 50% { opacity: .7; transform: scale(1.1); } }

/* ===== 舞台(画面いっぱいの枠。位置は layout() が入れる) ===== */
.stage {
  position: fixed; z-index: 10; overflow: hidden;
  left: var(--fx, 0px); top: var(--fy, 0px); width: var(--W, 100vw); height: var(--H, 100vh);
  background-color: var(--pal-bg);
  background-image: var(--grain);
  background-blend-mode: multiply;
  touch-action: manipulation;
}
.stage.ready-none * { transition: none !important; }

.dim {
  position: absolute; inset: 0; z-index: 0; pointer-events: none; opacity: 0;
  transition: opacity calc(1.2s * var(--t)) ease;
  background: radial-gradient(120% 90% at 50% 60%, transparent 30%, color-mix(in srgb, var(--pal-deep) 55%, #000 20%));
}
.bloom {
  position: absolute; left: var(--bx); top: var(--by); width: 40px; height: 40px; border-radius: 50%;
  transform: translate(-50%, -50%); z-index: 0; pointer-events: none; opacity: 0;
  background: radial-gradient(circle, rgba(255, 250, 232, 1) 0%, rgba(255, 236, 190, .85) 22%, rgba(244, 214, 150, .45) 45%, rgba(240, 205, 140, 0) 70%);
  transition: width calc(2s * var(--t)) cubic-bezier(.2, .7, .2, 1), height calc(2s * var(--t)) cubic-bezier(.2, .7, .2, 1), opacity calc(.9s * var(--t)) ease;
}
.stage.crack .dim { opacity: .5; }
.stage.crack .bloom { width: var(--bs); height: var(--bs); opacity: .95; }
.stage.full .dim, .stage.full .bloom { opacity: 0; transition: opacity calc(.8s * var(--t)) ease; }

/* ===== 封筒(画面の下寄り。ふたの先に封蝋)。
   重なりの順:背(1) < 手紙(2) < 前のポケット(3) < ふた(4) < 封蝋(5)。
   封筒は transform を使わずに top で下げる(transform を使うと重なりの順が変わって、手紙が一瞬ポケットの前に出てしまうため) ===== */
.envelope {
  position: absolute; left: var(--ex); top: var(--ey); width: var(--ew); height: var(--eh);
  transition: top calc(1s * var(--t)) cubic-bezier(.6, 0, .35, 1);
}
.env-back {
  position: absolute; inset: 0; z-index: 1; border-radius: 3px;
  background-color: var(--pal-env); background-image: var(--grain); background-blend-mode: multiply;
  box-shadow: 0 26px 38px -20px color-mix(in srgb, var(--pal-deep) 70%, transparent), 0 3px 6px -3px color-mix(in srgb, var(--pal-deep) 60%, transparent);
}
.env-pocket {
  position: absolute; inset: 0; z-index: 3; border-radius: 3px;
  background: linear-gradient(var(--pal-env), color-mix(in srgb, var(--pal-env) 92.6%, #000)), var(--grain);
  background-blend-mode: multiply;
  clip-path: polygon(0 0, 50% 58%, 100% 0, 100% 100%, 0 100%);
}
.env-pocket::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to bottom, rgba(255, 255, 255, .18), transparent 40%); }
.env-flap {
  position: absolute; left: 0; right: 0; top: 0; height: 62.5%; z-index: 4;
  transform-origin: top; transform: perspective(700px) rotateX(0);
  transition: transform calc(.95s * var(--t)) cubic-bezier(.5, 0, .25, 1), z-index 0s calc(.48s * var(--t));
}
.env-flap i, .env-flap em { position: absolute; inset: 0; clip-path: polygon(0 0, 100% 0, 50% 100%); }
.env-flap i { background: linear-gradient(color-mix(in srgb, var(--pal-env) 92%, #fff 8%), var(--pal-env)), var(--grain); background-blend-mode: multiply; }
.env-flap em { background: var(--pal-lining); opacity: 0; transition: opacity calc(.2s * var(--t)) calc(.48s * var(--t)); }
.stage.crack .env-flap { transform: perspective(700px) rotateX(180deg); z-index: 1; }
.stage.crack .env-flap em { opacity: 1; }
.stage.full .envelope { top: var(--eaway); }

/* ===== 封蝋(金。光がときどき走る) ===== */
.seal {
  position: absolute; left: 50%; top: 62.5%; width: var(--ss); height: var(--ss);
  transform: translate(-50%, -50%); z-index: 5; border: 0; padding: 0; background: none; cursor: pointer; border-radius: 50%;
  filter: drop-shadow(0 3px 4px rgba(60, 40, 10, .35));
  transition: transform .12s ease;
}
.seal:focus-visible { outline: 3px solid #2F6FDE; outline-offset: 4px; }
.seal-half {
  position: absolute; inset: 0; width: 100%; height: 100%;
  transition: transform calc(.7s * var(--t)) cubic-bezier(.3, 0, .3, 1), opacity calc(.6s * var(--t)) ease;
}
/* 不揃いな割れ目で左右に分ける */
.seal-right { clip-path: polygon(50% 0, 100% 0, 100% 100%, 46% 100%, 54% 62%, 44% 40%); }
.seal-left  { clip-path: polygon(0 0, 50% 0, 44% 40%, 54% 62%, 46% 100%, 0 100%); }
.stage.press .seal { transform: translate(-50%, -50%) scale(.94); pointer-events: none; }
.stage.crack .seal-left  { transform: translate(-16px, 30px) rotate(-26deg); opacity: 0; }
.stage.crack .seal-right { transform: translate(16px, 34px) rotate(20deg); opacity: 0; }
.glint { position: absolute; inset: 0; border-radius: 50%; overflow: hidden; pointer-events: none; }
.glint::after {
  content: ""; position: absolute; top: -20%; bottom: -20%; width: 38%; left: -60%;
  background: linear-gradient(100deg, transparent, rgba(255, 250, 225, .8), transparent);
  transform: skewX(-18deg); animation: sweep 4.2s ease-in-out 1.2s infinite;
}
@keyframes sweep { 0% { left: -60%; } 30%, 100% { left: 130%; } }
.stage.crack .glint { display: none; }

/* 5秒さわらないと、封蝋のまわりに波紋が一度だけ出る */
.ripple { position: absolute; inset: 0; border-radius: 50%; pointer-events: none; opacity: 0; }
.ripple::before, .ripple::after {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  border: 1.5px solid rgba(201, 167, 98, .85); opacity: 0;
}
.stage.nudge .ripple { opacity: 1; }
.stage.nudge .ripple::before { animation: ripple 1.8s cubic-bezier(.2, .6, .3, 1) both; }
.stage.nudge .ripple::after { animation: ripple 1.8s cubic-bezier(.2, .6, .3, 1) .35s both; }
@keyframes ripple { 0% { transform: scale(1); opacity: .9; } 100% { transform: scale(2.1); opacity: 0; } }

/* ===== 手紙の紙。最初から画面と同じ大きさで、縮めて封筒の中に入れておく ===== */
.letter {
  position: absolute; left: 0; top: 0; width: var(--W, 100vw); height: var(--H, 100vh); z-index: 2;
  transform-origin: 0 0;
  transform: translate(var(--lx), var(--ly0)) scale(var(--ls));
  clip-path: inset(0 0 var(--lc0) 0);
  background-color: var(--l-paper); background-image: var(--grain); background-blend-mode: multiply;
  border-radius: 4px; box-shadow: 0 -2px 10px rgba(80, 60, 40, .10);
  transition: transform calc(1.2s * var(--t)) cubic-bezier(.22, .8, .25, 1), clip-path calc(1.2s * var(--t)) cubic-bezier(.22, .8, .25, 1), border-radius calc(1s * var(--t)) ease;
}
.stage.rise .letter { transform: translate(var(--lx), var(--ly1)) scale(var(--ls)); clip-path: inset(0 0 var(--lc1) 0); }
.stage.full .letter {
  transform: translate(0, 0) scale(1); clip-path: inset(0 0 0 0); border-radius: 0; box-shadow: none;
  transition: transform calc(1.15s * var(--t)) cubic-bezier(.65, 0, .25, 1), clip-path calc(1.15s * var(--t)) cubic-bezier(.65, 0, .25, 1), border-radius calc(1s * var(--t)) ease;
}
.stage.done .letter { transform: none; clip-path: none; }

.letter-in {
  position: absolute; inset: 0; overflow: hidden;
  padding: 34px clamp(22px, 7vw, 34px) calc(36px + env(safe-area-inset-bottom, 0px));
  display: flex; flex-direction: column; gap: 22px;
  color: var(--l-ink); outline: none;
}
.stage.done .letter-in { overflow-y: auto; -webkit-overflow-scrolling: touch; overscroll-behavior: contain; }
.letter-in > * { flex: none; margin: 0; }
.letter-in p { margin: 0; }

/* 並び(上から。全部入りのとき):しるし → 見出し → 動画 → 宛名・ひとこと・差出人 → 金の短い線 → 写真 → 金の短い線 → 声 → 返事 → 期限。
   入っていないものは抜く。ひとことが空のときは、宛名を上に、差出人を声のあとに置く。
   並べ方を変えるときは、この order の数字だけを変える */
.crest { order: 0; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.crest b { font: italic 500 28px/1 "Cormorant Garamond", serif; color: var(--l-gold); }
.crest i { display: block; width: 72px; height: 1px; background: linear-gradient(90deg, transparent, var(--l-gold-line), transparent); }
.letter-occasion { order: 1; text-align: center; font: 600 18px/1.6 var(--f-letter); color: var(--l-ink); letter-spacing: .06em; margin-top: -6px !important; }
.letter.no-paper .letter-to { order: 2; }
#videoWrap { order: 3; }
.letter-to { order: 4; font: 600 16px/1.9 var(--f-letter); color: var(--l-ink); padding: 0 2px; }
.paper { order: 5; }
.letter-body { font: 500 16px/2.1 var(--f-letter); color: var(--l-ink); padding: 0 2px; overflow-wrap: anywhere; }
.letter-body p { min-height: 2.1em; }
.letter-sign { order: 6; text-align: right; font: 500 15px/1.9 var(--f-letter); color: var(--l-ink); padding: 0 2px; margin-top: -8px !important; }
.media-note { order: 7; }
#photosWrap { order: 8; }
#voiceWrap { order: 9; }
.letter.no-paper .letter-sign { order: 10; margin-top: 0 !important; }
.reply { order: 11; }
.letter-foot { order: 12; }

/* 動画 */
.media { margin: 0; }
.video { margin: 0; }
.video video {
  display: block; width: 100%; aspect-ratio: 4 / 5; object-fit: cover; border-radius: 3px;
  background: linear-gradient(160deg, color-mix(in srgb, var(--pal-deep) 70%, #000), #1E1A19);
}

/* 声(金の再生ボタン+波形。ほかのものといっしょのときは1行) */
.voice { margin: 0; display: flex; align-items: center; gap: 14px; padding: 4px 2px; }
.voice-play {
  width: 52px; height: 52px; flex: none; border: 0; padding: 0; cursor: pointer; border-radius: 50%;
  display: grid; place-items: center;
  background: radial-gradient(circle at 36% 30%, #EAD69C, #B8944C 52%, #7E6029);
  box-shadow: 0 4px 10px -5px rgba(80, 55, 18, .6), inset 0 0 0 4px rgba(255, 240, 200, .22);
}
.voice-play::before { content: ""; border-left: 13px solid #FFF8E6; border-top: 8px solid transparent; border-bottom: 8px solid transparent; margin-left: 4px; }
.voice-play.playing::before { border: 0; margin: 0; width: 12px; height: 14px; background: linear-gradient(90deg, #FFF8E6 0 4px, transparent 4px 8px, #FFF8E6 8px 12px); }
.voice-play:focus-visible { outline: 3px solid #2F6FDE; outline-offset: 3px; }
.voice-wave {
  position: relative; flex: 1; height: 26px;
  background: repeating-linear-gradient(90deg, color-mix(in srgb, var(--pal-deep) 45%, transparent) 0 2px, transparent 2px 6px);
  -webkit-mask: radial-gradient(ellipse 100% 60% at 50% 50%, #000 55%, transparent 60%);
  mask: radial-gradient(ellipse 100% 60% at 50% 50%, #000 55%, transparent 60%);
}
.voice-wave i { position: absolute; left: 0; top: 0; bottom: 0; width: 0; background: repeating-linear-gradient(90deg, #A88745 0 2px, transparent 2px 6px); }
.voice-time { flex: none; min-width: 2.6em; font: 12px var(--f-letter-ui); color: var(--l-sub); letter-spacing: .04em; }

/* 区切りは金の細い線だけ(いくつか入っているとき、声と写真の前に) */
.letter.kind-many:is(.has-video, .has-words) #photosWrap::before, .letter.kind-many:is(.has-video, .has-words, .has-photo) #voiceWrap::before {
  content: ""; display: block; width: 56px; height: 1px; margin: 4px auto 24px;
  background: linear-gradient(90deg, transparent, var(--l-gold-line), transparent);
}

/* 1つだけのときは、紙の真ん中に大きく */
.letter.kind-words .crest, .letter.kind-voice .crest, .letter.kind-photo .crest, .letter.kind-video .crest { margin-bottom: auto !important; }
.letter.kind-words .reply, .letter.kind-voice .reply, .letter.kind-photo .reply, .letter.kind-video .reply { margin-top: auto !important; }
.letter.kind-words .letter-body { font-size: 17px; line-height: 2.3; }
.letter.kind-words .letter-body p {
  min-height: 2.3em;
  background: repeating-linear-gradient(to bottom, transparent 0 calc(2.3em - 1px), rgba(168, 135, 69, .22) calc(2.3em - 1px) 2.3em);
}
.letter.kind-words .letter-to, .letter.kind-words .letter-sign { font-size: 15px; color: #5A4F4A; }
.letter.kind-voice .voice { flex-direction: column; gap: 22px; padding: 10px 0 20px; }
.letter.kind-voice .voice-play { width: 96px; height: 96px; box-shadow: 0 6px 14px -6px rgba(80, 55, 18, .6), inset 0 0 0 5px rgba(255, 240, 200, .25); }
.letter.kind-voice .voice-play::before { border-left-width: 22px; border-top-width: 13px; border-bottom-width: 13px; margin-left: 7px; }
.letter.kind-voice .voice-play.playing::before { width: 20px; height: 24px; border: 0; margin: 0; background: linear-gradient(90deg, #FFF8E6 0 7px, transparent 7px 13px, #FFF8E6 13px 20px); }
.letter.kind-voice .voice-wave { flex: none; width: 170px; height: 34px; }
.letter.kind-voice .voice-time { min-width: 0; letter-spacing: .08em; }

/* 写真(横にめくる) */
.photos {
  display: grid; grid-auto-flow: column; grid-auto-columns: 82%;
  gap: 12px; overflow-x: auto; scroll-snap-type: x mandatory;
  margin: 0 calc(-1 * clamp(22px, 7vw, 34px)); padding: 0 clamp(22px, 7vw, 34px) 4px;
  scrollbar-width: none;
}
.photos::-webkit-scrollbar { display: none; }
.photos:has(> .photo:only-child) { grid-auto-columns: 100%; }
.letter.kind-photo .photos { grid-auto-columns: 100%; }
/* いくつか入っているときの写真:大1+小2の額のような並び。4枚目からは下に続ける。1枚は大きく、2枚は横に2つ */
.letter.kind-many .photos { grid-auto-flow: row; grid-template-columns: 3fr 2fr; gap: 6px; overflow: visible; margin: 0; padding: 0; scroll-snap-type: none; }
.letter.kind-many .photo:first-child { grid-row: span 2; }
.letter.kind-many .photo:first-child img { height: 100%; aspect-ratio: auto; }
.letter.kind-many .photo:nth-child(n+4) { grid-column: 1 / -1; }
.letter.kind-many .photo:nth-child(n+4) img { aspect-ratio: 4 / 3; }
.letter.kind-many .photos.n1 { grid-template-columns: 1fr; }
.letter.kind-many .photos.n1 .photo img { aspect-ratio: 4 / 5; height: auto; }
.letter.kind-many .photos.n2 { grid-template-columns: 1fr 1fr; }
.letter.kind-many .photos.n2 .photo:first-child { grid-row: auto; }
.letter.kind-many .photos.n2 .photo img { aspect-ratio: 3 / 4; height: auto; }
.letter.kind-many .photo img { border-radius: 2px; box-shadow: 0 6px 12px -9px rgba(60, 40, 30, .55); }
.letter.kind-many .photo-dots { display: none; }
.letter.kind-photo .photo img { aspect-ratio: 3 / 4; border-radius: 2px; box-shadow: 0 8px 16px -10px rgba(60, 40, 30, .5); }
.photo-dots { display: flex; gap: 6px; justify-content: center; margin-top: 12px; }
.photo-dots i { width: 6px; height: 6px; border-radius: 50%; background: #D8CCC4; transition: background .3s; }
.photo-dots i.on { background: var(--l-gold); }
.photo { margin: 0; scroll-snap-align: center; }
.photo img { display: block; width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 3px; box-shadow: 0 4px 12px rgba(80, 60, 40, .12); }

/* 動画・声・写真が見られないときの案内 */
.media-note {
  padding: 14px 4px; text-align: center;
  font: 500 14px/1.9 var(--f-letter); color: var(--l-sub);
  border-top: 1px solid rgba(168, 135, 69, .25); border-bottom: 1px solid rgba(168, 135, 69, .25);
}

/* 返事(紙の最後。紙になじむ見た目) */
.reply { margin-top: 10px !important; padding-top: 22px; border-top: 1px solid rgba(168, 135, 69, .3); }
.reply-title { margin: 0 0 10px; text-align: center; font: 600 15px/1.6 var(--f-letter); letter-spacing: .12em; color: var(--l-ink); }
.reply-form textarea {
  display: block; width: 100%; resize: none; min-height: 0;
  border: 0; border-radius: 0; padding: 4px 2px; background-color: transparent;
  font: 500 16px/2.1 var(--f-letter); color: var(--l-ink);
  background-image: repeating-linear-gradient(to bottom, transparent 0 calc(2.1em - 1px), rgba(168, 135, 69, .32) calc(2.1em - 1px) 2.1em);
  background-attachment: local; background-position: 0 4px;
}
.reply-form textarea::placeholder { color: #B3A79F; }
.reply-form textarea:focus { outline: none; background-color: rgba(255, 255, 255, .5); }
.reply-form textarea:disabled { opacity: .7; }
.reply-row { display: flex; align-items: center; justify-content: space-between; margin-top: 10px; }
.reply-count { font: 12px var(--f-letter-ui); color: var(--l-sub); }
.reply-send {
  min-height: 44px; padding: 8px 26px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--pal-deep); background: transparent; color: var(--pal-deep);
  font: 600 15px var(--f-letter); letter-spacing: .12em;
}
.reply-send:not(:disabled):active { background: var(--pal-deep); color: #fff; }
.reply-send:disabled { opacity: .35; cursor: default; }
.reply-send:focus-visible { outline: 3px solid #2F6FDE; outline-offset: 2px; }
.reply-error { margin: 8px 0 0; font: 14px/1.7 var(--f-letter-ui); color: #7a2a22; }
.reply-done { margin: 0; text-align: center; font: 500 15px/1.9 var(--f-letter); color: var(--l-ink); }
.reply-done strong { font-weight: 600; color: var(--pal-deep); }
.reply-done span { color: var(--l-sub); }

/* 期限(いちばん最後に小さく) */
.letter-foot { text-align: center; padding-top: 4px; }
.until { font: 11px var(--f-letter-ui); color: var(--l-sub); letter-spacing: .06em; }

/* ===== お知らせの画面(見つからない・準備中・期限切れ・読みこめない) ===== */
.notfound, .message-page {
  min-height: 100svh; display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; padding: 40px 12px; color: var(--l-sub);
  font: 500 15px/2 var(--f-letter);
}
.notfound p, .message-page p { margin: 0; }
.message-page .title, .notfound-title {
  margin: 0 0 14px; font: 600 20px/1.7 var(--f-letter); color: var(--l-ink); letter-spacing: .04em;
}
.mini-seal { width: 52px; height: 52px; margin: 0 0 22px; filter: drop-shadow(0 2px 3px rgba(60, 40, 10, .3)); }
.message-page .small { font-size: 13px; margin-top: 10px; }
.message-page .owner-link { margin-top: 48px; font: 13px/1.7 var(--f-letter-ui); }
.message-page .owner-link a { color: var(--l-sub); }
.message-page .btn {
  margin-top: 18px; min-height: 44px; padding: 8px 24px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--pal-deep); background: transparent; color: var(--pal-deep); font: 600 15px var(--f-letter);
}

body.previewing .stage { z-index: 10; }

/* 動きを減らす設定:光の走りと波紋は止め、ほかは短く */
@media (prefers-reduced-motion: reduce) {
  .glint::after, .loading-mark { animation: none; }
  .stage.nudge .ripple::before, .stage.nudge .ripple::after { animation-duration: .01s; }
}