/* 《煙火》站台樣式 v1 —— 依藍圖 v2。字型自架子集（OFL 授權，見 assets/fonts/OFL.txt） */

@font-face{
  font-family:"Serif TC";
  src:url("fonts/NotoSerifTC-sub.woff2") format("woff2");
  font-weight:200 900;font-display:swap;
}
@font-face{
  font-family:"Sans TC";
  src:url("fonts/NotoSansTC-sub.woff2") format("woff2");
  font-weight:100 900;font-display:swap;
}

:root{
  --paper:#E5E4DD;--ink:#1A1A18;--ink-2:#6B6A62;--hair:#C6C4BB;
  --accent:#465861;--sel:#d9d7cd;
  --fs:1.125rem;--lh:1.95;--measure:38rem;
  /* 章級覆寫插槽（藍圖 §4）：各章可覆寫 --paper/--accent 等，預設不啟用 */
}
html[data-theme="dark"]{
  --paper:#16171A;--ink:#DEDBD1;--ink-2:#8B8A80;--hair:#31322D;--accent:#7F98A1;--sel:#2a2c30;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:"Serif TC","Noto Serif TC","Source Han Serif TC","Songti TC",serif;
  line-height:var(--lh);transition:background .5s,color .5s}
::selection{background:var(--sel)}
.sans{font-family:"Sans TC","Noto Sans TC",sans-serif}
a{color:inherit}

/* ══ 封面 ══ */
.cover-page{min-height:100svh;display:flex;flex-direction:column;align-items:center;
  justify-content:center;text-align:center;padding:3.5rem 2rem}
.cover-page .center{display:flex;flex-direction:column;align-items:center;margin:auto 0}
.plumb{width:1px;height:64px;background:var(--hair);margin-bottom:2.2rem}
.cover-page .book{font-size:clamp(3rem,13vw,5rem);font-weight:500;letter-spacing:.3em;
  text-indent:.3em;margin:0;line-height:1.1}
.cover-page .enter{margin-top:2.8rem;font-family:"Sans TC",sans-serif;font-size:.86rem;
  letter-spacing:.3em;color:var(--ink);text-decoration:none;padding:.6rem 1.4rem;
  position:relative;text-indent:.3em;display:inline-block}
.cover-page .enter::after{content:"";position:absolute;left:50%;bottom:.35rem;width:0;height:1px;
  background:var(--accent);transition:width .3s,left .3s}
.cover-page .enter:hover::after,.cover-page .enter:focus-visible::after{width:60%;left:20%}
.cover-foot{width:100%;max-width:34rem;display:flex;flex-direction:column;gap:.9rem;align-items:center}
.cover-foot .latest{font-family:"Sans TC",sans-serif;font-size:.72rem;letter-spacing:.12em;color:var(--ink-2)}
.cover-foot .latest b{font-weight:500;color:var(--ink)}
.cover-foot .rule{width:2rem;height:1px;background:var(--hair)}
.cover-foot .byline{font-size:.95rem;letter-spacing:.4em;text-indent:.4em;color:var(--ink)}
.cover-foot .notice{font-family:"Sans TC",sans-serif;font-size:.66rem;line-height:1.7;
  letter-spacing:.03em;color:var(--ink-2);max-width:26rem}

/* ══ 頂欄 ══ */
.bar{position:sticky;top:0;z-index:40;display:flex;align-items:center;justify-content:space-between;
  padding:.55rem clamp(1rem,4vw,2rem);
  background:color-mix(in srgb,var(--paper) 88%,transparent);
  backdrop-filter:saturate(120%) blur(8px);border-bottom:1px solid var(--hair)}
.bar-l,.bar-r{display:flex;align-items:center;gap:.3rem}
.bar button,.bar a.btn{font-family:"Sans TC",sans-serif;font-size:.8rem;color:var(--ink-2);
  background:none;border:1px solid transparent;border-radius:2px;padding:.3rem .5rem;cursor:pointer;
  line-height:1;letter-spacing:.02em;transition:color .2s,border-color .2s;text-decoration:none}
.bar button:hover,.bar a.btn:hover,.bar button:focus-visible{color:var(--ink);border-color:var(--hair)}
.bar #tocBtn{border-color:var(--hair)}
.bar .home{font-family:"Serif TC",serif;font-size:.95rem;letter-spacing:.18em;color:var(--ink);
  border:none;padding:.3rem .2rem;text-decoration:none}
.bar .pos{font-family:"Sans TC",sans-serif;font-size:.72rem;letter-spacing:.16em;color:var(--ink-2)}
.bar .divider{width:1px;height:1rem;background:var(--hair);margin:0 .12rem}
.bar .ctl{font-family:"Sans TC",sans-serif;font-size:.72rem;color:var(--ink-2);min-width:2.6em;text-align:center}
.progress{position:absolute;left:0;bottom:-1px;height:2px;width:0;background:var(--accent);transition:width .1s linear}

/* ══ 目錄抽屜 ══ */
.scrim{position:fixed;inset:0;background:rgba(0,0,0,.28);opacity:0;visibility:hidden;
  transition:opacity .3s,visibility .3s;z-index:50}
.scrim.open{opacity:1;visibility:visible}
.toc{position:fixed;top:0;left:0;height:100%;width:min(84vw,20rem);z-index:60;background:var(--paper);
  border-right:1px solid var(--hair);transform:translateX(-102%);
  transition:transform .34s cubic-bezier(.4,0,.2,1);padding:1.4rem;overflow-y:auto;
  display:flex;flex-direction:column;line-height:1.6}
.toc.open{transform:translateX(0)}
.toc-home{align-self:flex-start;font-family:"Sans TC",sans-serif;font-size:.76rem;letter-spacing:.14em;
  color:var(--ink-2);text-decoration:none;padding:.2rem 0;margin-bottom:1.1rem}
.toc-home:hover{color:var(--ink)}
.toc h2{font-family:"Sans TC",sans-serif;font-size:.72rem;letter-spacing:.28em;color:var(--ink-2);
  font-weight:500;margin:0 0 1.1rem}
.ch-head{display:flex;align-items:center;gap:.5rem;width:100%;text-align:left;background:none;border:none;
  cursor:pointer;padding:.55rem 0;color:var(--ink);font-family:"Serif TC",serif;font-size:1.02rem}
.ch-head .idx{font-size:.72rem;color:var(--ink-2);font-family:"Sans TC",sans-serif;letter-spacing:.15em}
.ch-head .caret{margin-left:auto;color:var(--ink-2);transition:transform .28s;font-size:.7rem}
.ch-group.collapsed .caret{transform:rotate(-90deg)}
.sec-list{list-style:none;margin:0;padding:.1rem 0 .3rem;overflow:hidden;
  transition:max-height .32s ease,opacity .25s}
.ch-group.collapsed .sec-list{max-height:0!important;opacity:0}
.sec-list li a,.sec-list li span.up{display:flex;gap:.7rem;text-decoration:none;color:var(--ink-2);
  padding:.42rem 0 .42rem 1.4rem;font-size:.94rem;border-left:1px solid var(--hair);
  transition:color .2s,border-color .2s}
.sec-list li a:hover{color:var(--ink)}
.sec-list li .n{font-family:"Sans TC",sans-serif;font-size:.78rem;opacity:.75}
.sec-list li a.current{color:var(--ink);border-left:1px solid var(--accent)}
.sec-list li a.current .n{color:var(--accent);opacity:1}
.sec-list li span.up{opacity:.6}
.sec-list li span.up .tag{font-family:"Sans TC",sans-serif;font-size:.64rem;letter-spacing:.12em;
  border:1px solid var(--hair);border-radius:2px;padding:.05rem .3rem;margin-left:auto}
.toc-note{margin:.3rem 0 1.1rem 1.4rem;font-family:"Sans TC",sans-serif;font-size:.76rem;color:var(--ink-2)}
.halls{padding-top:1rem;border-top:1px solid var(--hair)}
.halls .lbl{font-family:"Sans TC",sans-serif;font-size:.68rem;letter-spacing:.24em;color:var(--ink-2);margin:0 0 .3rem}
.halls a{display:flex;justify-content:space-between;align-items:center;text-decoration:none;color:var(--ink);
  font-family:"Serif TC",serif;font-size:.98rem;padding:.5rem 0}
.halls a .lock{font-family:"Sans TC",sans-serif;font-size:.66rem;letter-spacing:.1em;color:var(--ink-2)}
.toc-foot{margin-top:auto;padding-top:1.4rem;border-top:1px solid var(--hair)}
.toc-foot .byline{font-size:.85rem;letter-spacing:.34em;color:var(--ink);margin-bottom:.5rem}
.toc-foot .notice{font-family:"Sans TC",sans-serif;font-size:.64rem;line-height:1.7;color:var(--ink-2)}

/* ══ 正文 ══ */
main{padding:clamp(2.5rem,7vw,5rem) clamp(1.25rem,5vw,2rem) 5rem}
article{max-width:var(--measure);margin:0 auto;font-size:var(--fs);line-height:var(--lh);transition:font-size .2s}
.opener{text-align:center;margin-bottom:clamp(2.4rem,6vw,3.6rem);line-height:1.4}
.opener .plumb{height:52px;margin:0 auto 1.4rem}
.opener .chp{font-family:"Sans TC",sans-serif;font-size:.74rem;letter-spacing:.34em;color:var(--ink-2);
  margin:0 0 1rem;text-indent:.34em}
.opener .ttl{font-size:1.9rem;font-weight:500;letter-spacing:.14em;text-indent:.14em;display:block;margin-bottom:.6rem}
.opener .secno{font-family:"Sans TC",sans-serif;font-size:.72rem;letter-spacing:.2em;color:var(--ink-2)}
article p{margin:0 0 .68em;margin-bottom:.35lh;text-indent:2em}
article p.tight{margin-top:-.68em;margin-top:-.35lh} /* 緊貼行:與上一段零距(同一口氣) */
article p .v{font-style:italic} /* 雷光聲道通道・未套用 */

/* 語義標記三種（藍圖 §4）：gap 以 lh 綁行距、場切另有記號，不得互相客串 */
.gap1{height:1.27em;height:.65lh}
.gap2{height:3.22em;height:1.65lh}
.scenebreak{text-align:center;margin:1lh 0;color:var(--ink-2);line-height:1}
.scenebreak::before{content:"◇　◇　◇";font-size:.7em;letter-spacing:.2em}

.endmark{text-align:center;margin:3rem 0 1.4rem;color:var(--ink-2);line-height:1}
.endmark span{display:inline-block;width:5px;height:5px;background:var(--hair);transform:rotate(45deg)}
.postscript{max-width:var(--measure);margin:0 auto;line-height:1.6}
.ps-toggle{width:100%;background:none;border:1px solid var(--hair);border-radius:2px;cursor:pointer;
  font-family:"Sans TC",sans-serif;font-size:.82rem;letter-spacing:.14em;color:var(--ink-2);
  padding:.7rem 1rem;transition:color .2s,border-color .2s}
.ps-toggle:hover{color:var(--ink);border-color:var(--ink-2)}
.ps-body{max-height:0;overflow:hidden;transition:max-height .35s ease}
.ps-body .inner{padding:1.2rem .2rem .4rem;font-size:.95rem;color:var(--ink-2)}
.dlog{margin:0}
.dlog dt{color:var(--ink);font-family:"Serif TC",serif;font-size:1em;margin:1.1em 0 .25em}
.dlog dt:first-child{margin-top:0}
.dlog dt .alias{font-family:"Sans TC",sans-serif;font-size:.78em;color:var(--ink-2);margin-left:.3em}
.dlog dd{margin:0;line-height:1.85}
.nextnav{max-width:var(--measure);margin:2.4rem auto 0;display:flex;justify-content:flex-end;line-height:1.4}
.nextnav .next{font-family:"Sans TC",sans-serif;font-size:.86rem;color:var(--ink-2);
  display:flex;flex-direction:column;align-items:flex-end;gap:.2rem;text-decoration:none;opacity:.55}
.nextnav .next small{font-size:.68rem;letter-spacing:.22em}
.nextnav .next b{font-weight:500;font-family:"Serif TC",serif;font-size:1rem}

/* ══ 館（獨立頁） ══ */
.hall-main{max-width:var(--measure);margin:0 auto;padding:clamp(2rem,6vw,4rem) clamp(1.25rem,5vw,2rem) 5rem;line-height:1.8}
.hall-main h1{font-size:1.7rem;font-weight:500;letter-spacing:.14em;margin:0 0 .4rem;line-height:1.3}
.gate{font-family:"Sans TC",sans-serif;font-size:.78rem;letter-spacing:.06em;color:var(--ink-2);
  border-left:2px solid var(--accent);padding:.6rem .9rem;margin:1.6rem 0;
  background:color-mix(in srgb,var(--accent) 7%,transparent)}
.placeholder{color:var(--ink-2);font-size:.95rem}

/* ══ 插圖框（美術館裱框） ══ */
.gallery-list{margin-top:1.4rem}
.plate{margin:0 0 2.6rem}
.plate .mat{background:color-mix(in srgb,var(--paper) 60%,#fff);border:1px solid var(--hair);
  padding:clamp(.9rem,4vw,1.6rem);position:relative;box-shadow:0 1px 0 rgba(0,0,0,.02)}
html[data-theme="dark"] .plate .mat{background:color-mix(in srgb,var(--paper) 70%,#000)}
.plate .frameline{border:1px solid var(--hair)}
.plate .img{position:relative;overflow:hidden}
.plate .img img{display:block;width:100%;height:auto}
.plate .img .veil{position:absolute;inset:0;display:grid;place-items:center;
  background:color-mix(in srgb,var(--paper) 82%,transparent);backdrop-filter:blur(14px)}
.plate .img.revealed .veil{display:none}
.plate .reveal{font-family:"Sans TC",sans-serif;font-size:.76rem;letter-spacing:.1em;color:var(--ink);
  background:var(--paper);border:1px solid var(--hair);border-radius:2px;padding:.5rem .9rem;cursor:pointer}
.plate .ai-badge{position:absolute;top:.6rem;right:.6rem;font-family:"Sans TC",sans-serif;font-size:.6rem;
  letter-spacing:.14em;color:var(--ink-2);background:var(--paper);border:1px solid var(--hair);
  border-radius:2px;padding:.16rem .4rem;z-index:2}
.plate .cap{display:flex;flex-wrap:wrap;align-items:baseline;gap:.3rem .9rem;margin-top:.9rem;line-height:1.5}
.plate .cap .t{font-family:"Serif TC",serif;font-size:1rem;color:var(--ink)}
.plate .cap .r{font-family:"Sans TC",sans-serif;font-size:.72rem;letter-spacing:.08em;color:var(--ink-2)}

a.skip{position:absolute;left:-999px}
a.skip:focus{left:1rem;top:.5rem;background:var(--paper);padding:.4rem .6rem;z-index:80;border:1px solid var(--hair)}
@media (max-width:520px){
  :root{--fs:1.06rem}
  .bar .pos{display:none}
  .opener .ttl{font-size:1.6rem}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}