:root{
  --bg:#101418;
  --panel:#1a2023;
  --ink:#e9ece7;
  --muted:#96a29b;
  --accent:#46bd9c;
  --accent-deep:#0d1f1a;
  --amber:#d9a45b;
  --red:#e24b4a;
  --line:#2a322e;
  --msg-h:clamp(158px, 23vh, 210px); /* メッセージ枠の固定高さ（文字量・文字サイズ非依存） */
}
*{ box-sizing:border-box; }
html, body{ height:100%; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Hiragino Mincho ProN","Yu Mincho","Noto Serif JP",serif;
  line-height:2;
  overflow:hidden;
}
[hidden]{ display:none !important; }
button{
  font-family:inherit;
  font-size:1rem;
  color:var(--ink);
  cursor:pointer;
  letter-spacing:.08em;
}

/* ---------- title ---------- */
#title-screen{
  position:relative;
  height:100vh; height:100dvh;
  display:flex; flex-direction:column;
  align-items:center; justify-content:center;
  gap:.9rem; text-align:center; padding:2rem;
  overflow:hidden;
}
#title-screen .portal-back{
  position:absolute !important; top:calc(env(safe-area-inset-top, 0px) + 12px); left:12px; z-index:3;
  font-family:system-ui, sans-serif; font-size:12px; letter-spacing:.04em;
  color:#fff; text-decoration:none;
  background:rgba(10,15,18,.55); border:1px solid rgba(255,255,255,.25);
  border-radius:100px; padding:5px 12px;
  -webkit-backdrop-filter:blur(8px); backdrop-filter:blur(8px);
}
.portal-back:hover{ border-color:var(--accent); }
#title-bg{ position:absolute; inset:0; z-index:0; }
#title-bg svg{ display:block; width:100%; height:100%; }
#title-bg img{ display:block; width:100%; height:100%; object-fit:cover; object-position:center bottom; }
#title-bg::after{
  content:""; position:absolute; inset:0;
  background:radial-gradient(ellipse at center, transparent 30%, rgba(6,10,14,.72) 100%);
}
#title-screen > *:not(#title-bg){ position:relative; z-index:1; }
.title-sub{
  color:#cfd8d2; letter-spacing:.46em; font-size:.82rem; margin:0;
  text-shadow:0 1px 12px rgba(0,0,0,.8);
}
h1{
  font-size:clamp(2.4rem, 8vw, 3.6rem); font-weight:600;
  letter-spacing:.22em; margin:.05em 0;
  text-shadow:0 2px 24px rgba(0,0,0,.85);
  text-wrap:balance;
}
.title-caption{
  color:var(--accent); letter-spacing:.3em; font-size:.85rem;
  margin:.4rem 0 2rem; font-variant-numeric:tabular-nums;
  text-shadow:0 1px 10px rgba(0,0,0,.8);
}
.title-menu{ display:flex; gap:1rem; flex-wrap:wrap; justify-content:center; }
.title-menu button{
  background:rgba(10,15,18,.72);
  border:1px solid rgba(233,236,231,.28);
  border-radius:6px;
  padding:.8rem 2.2rem;
  backdrop-filter:blur(4px);
  transition:border-color .25s, background .25s, letter-spacing .25s;
}
.title-menu button:hover, .title-menu button:focus-visible{
  border-color:var(--accent);
  background:rgba(13,31,26,.85);
  letter-spacing:.18em;
  outline:none;
}
/* スマホでは縦積み＋横幅を揃える（横並びの縦長ボタンを防ぐ） */
@media (max-width: 540px){
  .title-menu{ flex-direction:column; width:min(76vw, 300px); }
  .title-menu button{ width:100%; padding:.9rem 1rem; }
  /* スマホは枠を少し高く・行間と余白を詰めて表示行数を確保する（下端の文字切れ対策） */
  :root{ --msg-h:clamp(203px, 30vh, 228px); }  /* 6行入る高さ */
  #msg-window{ padding:1.15rem 1.15rem 1rem; }
  #msg-text{ font-size:.95rem; line-height:1.85; }
}

/* ---------- name entry ---------- */
#name-entry{
  min-height:100vh; min-height:100dvh;
  display:flex; align-items:center; justify-content:center;
  padding:2rem 1.2rem;
}
.ne-panel{
  width:min(100%, 26em);
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:8px;
  padding:1.8rem 1.8rem 1.6rem;
  box-shadow:0 12px 48px rgba(4,7,10,.5);
}
.ne-title{
  margin:0 0 .7rem;
  color:var(--accent);
  font-size:.82rem; letter-spacing:.3em; font-weight:600;
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
}
.ne-title + .ne-title, .ne-grid + .ne-title{ margin-top:1.5rem; }
.ne-grid{ display:grid; grid-template-columns:1fr 1fr; gap:.8rem; }
.ne-grid.one{ grid-template-columns:1fr; }
.ne-grid label{
  display:flex; flex-direction:column; gap:.3rem;
  font-size:.8rem; color:var(--muted);
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  letter-spacing:.08em;
}
.ne-grid input{
  width:100%; min-width:0;
  font-family:"Hiragino Mincho ProN","Yu Mincho",serif;
  font-size:1.05rem; color:var(--ink);
  background:var(--bg);
  border:1px solid var(--line); border-radius:4px;
  padding:.5rem .8rem;
}
.ne-grid input:focus{ outline:none; border-color:var(--accent); }
.ne-note{
  color:var(--muted); font-size:.8rem; line-height:1.8;
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  margin:1.2rem 0 1.4rem;
}
#ne-start{
  width:100%;
  background:var(--accent); color:#08130f;
  border:none; border-radius:4px;
  font-weight:600; letter-spacing:.2em;
  padding:.85rem;
}
#ne-start:hover{ filter:brightness(1.1); }

/* ---------- game ---------- */
#game-screen{
  height:100vh; height:100dvh;
  display:flex; flex-direction:column;
  position:relative;
}
#hud{
  position:absolute; top:0; left:0; right:0; z-index:3;
  display:flex; flex-wrap:wrap; gap:.3rem 1.2rem; align-items:center;
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  font-size:.76rem; color:#dfe6e1;
  letter-spacing:.14em;
  padding:.65rem 1.1rem;
  background:linear-gradient(rgba(8,12,15,.82), rgba(8,12,15,0));
  text-shadow:0 1px 4px rgba(0,0,0,.9);
  pointer-events:none;
}
#hud-keikai{ letter-spacing:.26em; }
#hud-keikai .k-on{ color:#ff7b7a; }
#hud-keikai .k-off{ color:rgba(233,236,231,.28); }
#hud-flags .chip{
  display:inline-block; margin-right:.35rem;
  border:1px solid var(--accent); color:var(--accent);
  font-size:.68rem; padding:0 .4em; letter-spacing:.1em;
  border-radius:2px;
  background:rgba(8,12,15,.5);
}
.hud-spacer{ flex:1; }
.hud-btn{
  pointer-events:auto;
  background:rgba(10,15,18,.7);
  border:1px solid rgba(233,236,231,.25);
  border-radius:3px;
  color:#dfe6e1;
  font-size:.74rem; letter-spacing:.14em;
  padding:.2rem .7rem;
}
.hud-btn:hover{ border-color:var(--accent); color:var(--accent); }

/* ---------- journal ---------- */
#journal{
  position:fixed; inset:0; z-index:50;
  background:rgba(6,9,12,.72);
  display:flex; align-items:center; justify-content:center;
  padding:1.2rem;
  backdrop-filter:blur(3px);
}
.jn-panel{
  width:min(100%, 34em);
  max-height:88vh;
  display:flex; flex-direction:column;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:8px;
  box-shadow:0 16px 60px rgba(0,0,0,.6);
  overflow:hidden;
}
.jn-tabs{
  display:flex; align-items:center;
  border-bottom:1px solid var(--line);
  padding:.5rem .7rem 0;
  gap:.3rem;
}
.jn-tab{
  background:none; border:none;
  color:var(--muted);
  font-size:.9rem; letter-spacing:.2em;
  padding:.55rem 1.1rem;
  border-bottom:2px solid transparent;
}
.jn-tab.active{ color:var(--accent); border-bottom-color:var(--accent); }
#jn-close{
  margin-left:auto;
  background:none; border:none; color:var(--muted);
  font-size:1rem; padding:.4rem .6rem;
}
#jn-close:hover{ color:var(--ink); }
#jn-body{
  overflow-y:auto;
  padding:1.2rem 1.4rem 1.5rem;
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
}
.jn-note{ color:var(--muted); font-size:.78rem; letter-spacing:.1em; margin:0 0 1rem; }

/* 手がかり */
.clue{
  border:1px solid var(--line); border-radius:6px;
  padding:.8rem 1.1rem; margin-bottom:.7rem;
}
.clue .cl-head{ display:flex; align-items:center; gap:.6rem; }
.clue .cl-flag{
  font-size:.7rem; letter-spacing:.1em;
  border:1px solid var(--accent); color:var(--accent);
  border-radius:2px; padding:0 .45em;
}
.clue.locked .cl-flag{ border-color:var(--line); color:var(--muted); }
.clue .cl-name{ font-size:.95rem; font-weight:600; letter-spacing:.06em; }
.clue.locked .cl-name{ color:var(--muted); }
.clue .cl-desc{ margin:.45rem 0 0; font-size:.85rem; line-height:1.85; color:#c6cec7; }
.clue.locked .cl-desc{ color:var(--muted); }
.clue .cl-desc .hint-label{ color:var(--amber); font-size:.75rem; letter-spacing:.16em; margin-right:.5em; }

/* ルート */
.rt-list{ position:relative; margin:0; padding:0 0 0 1.6rem; list-style:none; }
.rt-list::before{
  content:""; position:absolute; left:.45rem; top:.7rem; bottom:.7rem;
  width:2px; background:var(--line);
}
.rt-node{ position:relative; padding:.55rem 0 .55rem .6rem; }
.rt-node::before{
  content:""; position:absolute; left:-1.34rem; top:1.05rem;
  width:10px; height:10px; border-radius:50%;
  background:var(--line);
}
.rt-node.reached::before{ background:var(--accent); }
.rt-node.current::before{
  box-shadow:0 0 0 4px rgba(70,189,156,.25);
}
.rt-label{ font-size:.94rem; font-weight:600; letter-spacing:.05em; }
.rt-node.locked .rt-label{ color:var(--muted); font-weight:400; }
.rt-node.current .rt-label{ color:var(--accent); }
.rt-sub{ font-size:.78rem; color:var(--muted); margin-top:.1rem; line-height:1.7; }
.rt-branch{
  margin:.3rem 0 .2rem .6rem;
  padding:.4rem .9rem;
  border-left:2px dashed var(--line);
  font-size:.82rem; color:var(--muted);
}
.rt-branch.seen{ border-left-color:#a24444; }
.rt-endings{ margin-top:.4rem; }
.rt-endings .rt-node::before{ border-radius:2px; }

#stage{
  position:absolute; inset:0;
  display:flex; align-items:flex-end; justify-content:center;
  overflow:hidden;
  /* 立ち絵はメッセージ枠の後ろへ回り込ませる（下端は枠に隠れて見切れない）。
     枠に少しだけ食い込ませて、胸元のハード切れを見せない。 */
  padding-bottom:calc(var(--msg-h) - 40px);
}
#bg{ position:absolute; inset:0; z-index:0; }
#bg svg{ display:block; width:100%; height:100%; }
#bg img{ display:block; width:100%; height:100%; object-fit:cover; object-position:center bottom; }
#bg::after{
  content:""; position:absolute; inset:0;
  background:linear-gradient(rgba(10,14,17,.14), rgba(10,14,17,0) 30%, rgba(10,14,17,0) 62%, rgba(10,14,17,.5));
}
#sprite{
  position:relative; z-index:1;
  height:100%;
  display:flex; align-items:flex-end; justify-content:center;
  transition:filter .35s, opacity .35s;
  filter:drop-shadow(0 10px 24px rgba(5,8,11,.45));
}
#sprite svg{ width:min(62vw, 280px); height:auto; display:block; }
#sprite img{ max-height:min(90%, 500px); max-width:74vw; width:auto; height:auto; display:block; }
#sprite.dim{ filter:brightness(.62) saturate(.75); }
#sprite.none{ opacity:0; }

#choice-area{
  position:absolute; left:0; right:0; bottom:calc(var(--msg-h) + 12px); z-index:6;
  display:flex; flex-direction:column; align-items:center; gap:.6rem;
  padding:0 1.2rem;
  max-height:52vh; overflow-y:auto;
}
#choice-area button{
  width:min(100%, 34em);
  text-align:center; line-height:1.8; font-size:.98rem;
  background:rgba(10,15,18,.86);
  border:1px solid rgba(233,236,231,.22);
  border-radius:4px;
  padding:.65rem 1.4rem;
  backdrop-filter:blur(5px);
  box-shadow:0 4px 18px rgba(4,7,10,.5);
  transition:border-color .2s, background .2s, transform .15s;
}
#choice-area button:hover, #choice-area button:focus-visible{
  border-color:var(--accent);
  background:rgba(13,31,26,.92);
  transform:translateY(-1px);
  outline:none;
}
#choice-area button .tag{
  color:var(--amber); font-size:.76rem; margin-left:.7em;
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  letter-spacing:.08em;
}
#choice-area button .done{ color:var(--muted); font-size:.76rem; margin-left:.7em; }

#msg-window{
  position:absolute; left:0; right:0; bottom:0; z-index:5;
  margin:0 auto;
  width:min(100%, 50em);
  height:var(--msg-h);          /* 固定高さ。文字量・文字サイズで変わらない */
  /* overflowは#msg-text側でクリップ（windowで切ると上にはみ出す名前プレートが欠ける） */
  background:linear-gradient(rgba(12,17,20,.93), rgba(9,13,16,.97));
  border-top:1px solid rgba(70,189,156,.55);
  box-shadow:0 -10px 40px rgba(4,7,10,.55);
  padding:1.55rem 1.7rem 1.4rem;
  backdrop-filter:blur(8px);
}
#msg-name{
  position:absolute; top:-1.05em; left:1.1rem;
  background:var(--accent);
  color:#08130f;
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  font-size:.82rem; font-weight:600; letter-spacing:.3em;
  padding:.12rem 1rem .12rem 1.25rem;
  border-radius:2px;
  box-shadow:0 3px 12px rgba(4,7,10,.5);
}
#msg-text{
  margin:0;
  font-size:1.02rem;
  animation:fadein .35s ease both;
  min-height:3em;
  max-height:100%;
  overflow:hidden;              /* 想定超の長文は枠内でクリップ（背景・枠は不動） */
}
#msg-text.narration{ color:#c6cec7; }
#msg-text.line-strong{ color:#fff; text-shadow:0 0 14px rgba(70,189,156,.35); }
#msg-text.line-prompt{
  color:var(--muted);
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  font-size:.9rem; letter-spacing:.14em;
}
#msg-text.line-sys{
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
  font-size:.84rem; color:var(--accent); line-height:1.8;
}
@keyframes fadein{ from{opacity:0;} to{opacity:1;} }
@keyframes pulse{ 0%,100%{opacity:1} 50%{opacity:.45} }
@media (prefers-reduced-motion: reduce){
  #msg-text{ animation:none; }
  #advance-hint{ animation:none !important; }
}
#advance-hint{
  position:absolute; right:1.2rem; bottom:.75rem;
  color:var(--accent); font-size:.85rem;
  animation:pulse 1.8s ease-in-out infinite;
}