/* ==========================================================================
   《余温》阅读端 · Afterglow Reading UI
   独立于官网主样式（main.css），仅由 /xiaoshuo/ 下的页面加载。
   意象：冷的世界里，一点残留的温度。深空蓝黑底 + 炭火橙强调。

   主题：html[data-theme="light"]
   字体：html[data-font="sans"]
   字号：html[data-fs="1|2|3|4"]
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root{
  --n-bg:#05080f;
  --n-bg-2:#0a0f1b;
  --n-panel:rgba(255,255,255,.04);
  --n-panel-2:rgba(255,255,255,.07);
  --n-line:rgba(233,162,59,.16);
  --n-line-2:rgba(233,162,59,.34);
  --n-fg:#e6e9f2;
  --n-fg-2:#a4aec4;
  --n-fg-3:#6d7791;
  --n-ember:#e9a23b;
  --n-ember-lt:#f6c46a;
  --n-cold:#22d3ee;

  --n-r-sm:10px; --n-r:14px; --n-r-lg:20px;
  --n-max:38em;

  --n-sans:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",system-ui,"Helvetica Neue",Arial,sans-serif;
  /* 注意两条坑：
     1) 不要在链里放 "STSong" —— Windows 上会被解析成黑体，整条链断在那里。
     2) SimSun 必须排在 "Source Han Serif SC" 前面 —— 某些 Windows 只装了
        Source Han Serif SC Heavy 单字重，正文会整段被渲染成伪黑体。
     Latin 交给 Georgia，CJK 往后落到 SimSun / Songti SC / Noto Serif SC。 */
  --n-serif:Georgia,SimSun,"Songti SC","Noto Serif SC","Source Han Serif SC","Noto Serif CJK SC","Source Han Serif CN",NSimSun,FangSong,serif;
  --n-mono:"Cascadia Mono","SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  --n-read:var(--n-serif);

  --n-ease:cubic-bezier(.22,.61,.36,1);
}

html[data-theme="light"]{
  --n-bg:#f5f1e9;
  --n-bg-2:#fffdf8;
  --n-panel:rgba(28,22,12,.035);
  --n-panel-2:rgba(28,22,12,.06);
  --n-line:rgba(140,95,25,.20);
  --n-line-2:rgba(140,95,25,.42);
  --n-fg:#1c1e24;
  --n-fg-2:#4d525f;
  --n-fg-3:#838a99;
  --n-ember:#b3700c;
  --n-ember-lt:#8f5906;
  --n-cold:#0e7490;
}

html[data-font="sans"]{ --n-read:var(--n-sans); }

html[data-fs="1"]{ --n-fs:16px; }
html[data-fs="2"]{ --n-fs:17.5px; }
html[data-fs="3"]{ --n-fs:19.5px; }
html[data-fs="4"]{ --n-fs:22px; }
@media (min-width:760px){
  html[data-fs="1"]{ --n-fs:16.5px; }
  html[data-fs="2"]{ --n-fs:18px; }
  html[data-fs="3"]{ --n-fs:20.5px; }
  html[data-fs="4"]{ --n-fs:23.5px; }
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--n-bg);color:var(--n-fg);
  font-family:var(--n-sans);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(ellipse 54% 40% at 12% -8%,rgba(233,162,59,.13),transparent 64%),
    radial-gradient(ellipse 46% 38% at 92% 4%,rgba(12,96,192,.20),transparent 62%),
    radial-gradient(ellipse 70% 40% at 50% 106%,rgba(12,60,156,.16),transparent 68%);
}
html[data-theme="light"] body::before{
  background:
    radial-gradient(ellipse 54% 40% at 12% -8%,rgba(233,162,59,.16),transparent 64%),
    radial-gradient(ellipse 46% 38% at 92% 4%,rgba(12,96,192,.07),transparent 62%);
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,p,ol,ul,figure{margin:0}
ol,ul{padding:0;list-style:none}
::selection{background:rgba(233,162,59,.30);color:var(--n-fg)}
:focus-visible{outline:2px solid var(--n-ember);outline-offset:3px;border-radius:4px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 3. Reading progress ---------- */
.rprog{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:60;
  background:transparent;pointer-events:none;
}
.rprog i{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--n-ember),var(--n-ember-lt));
  box-shadow:0 0 12px rgba(233,162,59,.55);
  transition:width .12s linear;
}

/* ---------- 4. Top bar ---------- */
.rtop{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;gap:12px;
  height:56px;padding:0 clamp(14px,4vw,28px);
  background:color-mix(in srgb,var(--n-bg) 82%,transparent);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--n-line);
}
@supports not (background:color-mix(in srgb,red,blue)){
  .rtop{background:var(--n-bg)}
}
.rtop__back{
  display:inline-flex;align-items:center;gap:7px;
  font-size:14px;color:var(--n-fg-2);
  padding:8px 12px;margin-left:-12px;border-radius:9px;
  transition:color .2s var(--n-ease),background .2s var(--n-ease);
  white-space:nowrap;
}
.rtop__back:hover{color:var(--n-ember);background:var(--n-panel)}
.rtop__back svg{width:15px;height:15px}
.rtop__ttl{
  flex:1;min-width:0;text-align:center;
  font-size:13.5px;letter-spacing:.06em;color:var(--n-fg-3);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.rtop__ttl b{color:var(--n-fg-2);font-weight:500}
.rtop__set{
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:36px;margin-right:-8px;border-radius:9px;
  font-family:var(--n-mono);font-size:13px;letter-spacing:-.02em;
  color:var(--n-fg-2);
  border:1px solid var(--n-line);
  transition:color .2s var(--n-ease),border-color .2s var(--n-ease),background .2s var(--n-ease);
}
.rtop__set:hover{color:var(--n-ember);border-color:var(--n-line-2);background:var(--n-panel)}

/* ---------- 5. Reading column ---------- */
.wrap{
  position:relative;z-index:1;
  width:100%;max-width:calc(var(--n-max) + 2 * clamp(20px,5vw,40px));
  margin:0 auto;padding:0 clamp(20px,5vw,40px) clamp(48px,7vw,88px);
}

/* chapter head */
.chead{padding:clamp(34px,7vw,64px) 0 clamp(24px,4vw,40px);border-bottom:1px solid var(--n-line);margin-bottom:clamp(28px,5vw,46px)}
.chead__no{
  font-family:var(--n-mono);font-size:12px;letter-spacing:.34em;
  color:var(--n-ember);opacity:.9;
}
.chead__ttl{
  margin:.24em 0 0;
  font-family:var(--n-serif);font-weight:600;
  font-size:clamp(30px,7.5vw,46px);line-height:1.2;letter-spacing:.04em;
  color:var(--n-fg);
}
.chead__meta{
  margin-top:.85em;font-size:13px;color:var(--n-fg-3);letter-spacing:.05em;
}
.chead__meta span + span::before{content:"·";margin:0 .55em;opacity:.55}

/* ---------- 6. Prose ---------- */
.prose{
  font-family:var(--n-read);
  font-size:var(--n-fs);line-height:1.92;
  color:var(--n-fg);
  letter-spacing:.012em;
}
.prose p{margin:0 0 1.08em;text-align:justify;text-justify:inter-ideograph;word-break:break-word}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--n-ember);font-weight:600}
html[data-theme="light"] .prose strong{color:var(--n-ember)}
.prose em{font-style:normal;color:var(--n-fg-2)}

/* section divider */
.prose hr.sep{
  border:0;height:1.5em;margin:2.1em 0 2.3em;position:relative;
}
.prose hr.sep::after{
  content:"· · ·";position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--n-mono);font-size:.85em;letter-spacing:.42em;
  color:var(--n-fg-3);opacity:.75;
}

/* ---------- 7. Ad insert （全书特色组件） ---------- */
.ad{
  position:relative;
  margin:2.2em auto 2.6em;max-width:26em;
  padding:1.5em 1.5em 1.4em;
  border:1px solid var(--n-line);border-radius:var(--n-r);
  background:
    linear-gradient(180deg,rgba(233,162,59,.10),transparent 72%),
    var(--n-panel);
  text-align:center;
  font-family:var(--n-sans);
  overflow:hidden;
}
.ad::before{
  content:"";position:absolute;inset:0 0 auto;height:1px;
  background:linear-gradient(90deg,transparent,var(--n-line-2),transparent);
}
.ad__mark{
  display:inline-block;
  font-family:var(--n-mono);font-size:10.5px;letter-spacing:.34em;
  color:var(--n-ember);opacity:.92;
  padding:3px 9px;border:1px solid var(--n-line);border-radius:99px;
}
.ad__note{
  margin:.95em 0 0;font-size:12.5px;color:var(--n-fg-3);letter-spacing:.04em;
}
.ad__line{
  margin:1.05em 0 0;
  font-family:var(--n-read);
  font-size:calc(var(--n-fs) * .96);line-height:1.85;
  color:var(--n-fg);
  text-align:center;text-justify:auto;
}
/* 广告随退化一起变粗糙：字数越少的越"旧"，字距被撑开 */
.ad--worn .ad__mark{opacity:.55}
.ad--worn .ad__line{letter-spacing:.24em;color:var(--n-fg-2);font-size:calc(var(--n-fs) * 1.06)}

/* ---------- 8. Chapter nav ---------- */
.cnav{
  display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:stretch;
  margin-top:clamp(44px,8vw,72px);padding-top:clamp(26px,4vw,36px);
  border-top:1px solid var(--n-line);
}
.cnav a{
  display:flex;flex-direction:column;justify-content:center;gap:5px;
  min-height:62px;padding:12px 15px;border-radius:var(--n-r);
  border:1px solid var(--n-line);background:var(--n-panel);
  transition:border-color .22s var(--n-ease),background .22s var(--n-ease),transform .22s var(--n-ease);
}
.cnav a:hover{border-color:var(--n-line-2);background:var(--n-panel-2);transform:translateY(-1px)}
.cnav__k{font-family:var(--n-mono);font-size:10.5px;letter-spacing:.24em;color:var(--n-fg-3)}
.cnav__v{font-size:14.5px;color:var(--n-fg-2);line-height:1.4}
.cnav__n{text-align:right}
.cnav__n .cnav__v{color:var(--n-fg)}
.cnav__p .cnav__v{color:var(--n-fg)}
.cnav__c{
  align-items:center;justify-content:center;min-width:76px;
  font-size:14px;color:var(--n-fg-2);text-align:center;
}
.cnav a.is-off{opacity:.32;pointer-events:none}

/* ---------- 9. Footer ---------- */
.rfoot{
  margin-top:clamp(40px,6vw,60px);padding-top:22px;
  border-top:1px solid var(--n-line);
  font-size:12.5px;color:var(--n-fg-3);line-height:1.9;
  display:flex;flex-wrap:wrap;gap:6px 18px;justify-content:space-between;
}
.rfoot a{color:var(--n-fg-2);border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.rfoot a:hover{color:var(--n-ember);border-color:var(--n-line-2)}

/* ---------- 10. Settings sheet ---------- */
.sheet{
  position:fixed;z-index:70;right:clamp(14px,4vw,28px);bottom:clamp(14px,4vw,28px);
  width:min(300px,calc(100vw - 28px));
  padding:18px;border-radius:var(--n-r-lg);
  background:var(--n-bg-2);border:1px solid var(--n-line);
  box-shadow:0 26px 60px -18px rgba(0,0,0,.72);
  transform:translateY(10px) scale(.98);opacity:0;visibility:hidden;
  transition:opacity .2s var(--n-ease),transform .2s var(--n-ease),visibility .2s;
}
.sheet.is-open{opacity:1;visibility:visible;transform:none}
.sheet__row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:9px 0}
.sheet__row + .sheet__row{border-top:1px solid var(--n-line)}
.sheet__k{font-size:13px;color:var(--n-fg-2);letter-spacing:.04em}
.seg{display:inline-flex;border:1px solid var(--n-line);border-radius:9px;overflow:hidden}
.seg button{
  padding:7px 12px;font-size:13px;color:var(--n-fg-3);
  transition:background .18s,color .18s;min-width:42px;
}
.seg button + button{border-left:1px solid var(--n-line)}
.seg button[aria-pressed="true"]{background:var(--n-panel-2);color:var(--n-ember)}
.seg button:hover{color:var(--n-fg)}
.sheet__hint{margin-top:12px;font-size:11.5px;color:var(--n-fg-3);line-height:1.75}

/* ---------- 11. Cover page ---------- */
.cover{
  position:relative;z-index:1;
  min-height:min(88vh,760px);
  display:flex;align-items:center;justify-content:center;
  padding:clamp(64px,12vw,120px) clamp(20px,5vw,40px) clamp(48px,8vw,80px);
  text-align:center;
}
.cover__glow{
  position:absolute;left:50%;top:34%;transform:translate(-50%,-50%);
  width:min(760px,120vw);height:min(760px,120vw);pointer-events:none;
  background:radial-gradient(circle,rgba(233,162,59,.17),transparent 62%);
}
.cover__in{position:relative;width:100%;max-width:640px}
.eyebrow{
  display:inline-block;font-family:var(--n-mono);font-size:11px;letter-spacing:.36em;
  color:var(--n-ember);opacity:.9;
  padding:5px 12px;border:1px solid var(--n-line);border-radius:99px;
}
.cover__ttl{
  margin:.5em 0 0;
  font-family:var(--n-serif);font-weight:700;
  font-size:clamp(64px,20vw,132px);line-height:1;letter-spacing:.08em;
  color:var(--n-fg);
  text-shadow:0 0 60px rgba(233,162,59,.22);
}
.cover__en{
  margin-top:.7em;font-family:var(--n-mono);font-size:clamp(11px,2.6vw,13px);
  letter-spacing:.62em;color:var(--n-ember);opacity:.82;text-indent:.62em;
}
.cover__tag{
  margin:clamp(26px,5vw,38px) auto 0;max-width:24em;
  font-size:clamp(14.5px,3.6vw,16.5px);line-height:2;color:var(--n-fg-2);
}
.cover__by{
  margin-top:1.5em;font-size:13.5px;color:var(--n-fg-3);letter-spacing:.14em;
}
.cover__by b{color:var(--n-fg-2);font-weight:500}
.btn-read{
  display:inline-flex;align-items:center;gap:9px;
  margin-top:clamp(28px,5vw,40px);
  padding:14px 30px;border-radius:99px;
  background:linear-gradient(135deg,#b8760f,#e9a23b 52%,#f6c46a);
  color:#1a1205;font-size:15px;font-weight:600;letter-spacing:.06em;
  box-shadow:0 16px 40px -14px rgba(233,162,59,.6);
  transition:transform .22s var(--n-ease),box-shadow .22s var(--n-ease);
}
.btn-read:hover{transform:translateY(-2px);box-shadow:0 22px 50px -14px rgba(233,162,59,.72)}
.btn-read svg{width:16px;height:16px}
.cover__embers{
  position:relative;margin-top:clamp(38px,7vw,56px);
  width:5px;height:5px;margin-inline:auto;border-radius:50%;
  background:var(--n-ember);box-shadow:0 0 18px 4px rgba(233,162,59,.5);
  animation:breathe 4.6s var(--n-ease) infinite;
}
@keyframes breathe{0%,100%{opacity:.35;transform:scale(.82)}50%{opacity:1;transform:scale(1.1)}}
@media (prefers-reduced-motion:reduce){
  .cover__embers{animation:none;opacity:.8}
  html{scroll-behavior:auto}
}

/* ---------- 12. Cover sections ---------- */
.sect{
  position:relative;z-index:1;
  width:100%;max-width:760px;margin:0 auto;
  padding:clamp(40px,7vw,64px) clamp(20px,5vw,40px);
}
.sect + .sect{border-top:1px solid var(--n-line)}
.sect__h{
  font-family:var(--n-mono);font-size:11.5px;letter-spacing:.3em;
  color:var(--n-ember);margin-bottom:1.5em;
}
.sect p{
  font-family:var(--n-read);font-size:clamp(15px,3.8vw,16.5px);
  line-height:2.05;color:var(--n-fg-2);
}
.sect p + p{margin-top:1em}
.sect p b{color:var(--n-fg);font-weight:600}

/* TOC */
.toc li + li{border-top:1px solid var(--n-line)}
.toc a{
  display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:baseline;
  padding:17px 4px;transition:background .2s var(--n-ease),padding .2s var(--n-ease);
}
.toc a:hover{background:var(--n-panel);padding-inline:12px;border-radius:var(--n-r-sm)}
.toc__no{font-family:var(--n-mono);font-size:12px;color:var(--n-ember);opacity:.85;letter-spacing:.1em}
.toc__bd{display:block;min-width:0}
.toc__t{display:block;font-family:var(--n-serif);font-size:17.5px;color:var(--n-fg);letter-spacing:.03em}
.toc__d{display:block;margin-top:5px;font-size:13px;line-height:1.7;color:var(--n-fg-3)}
.toc__w{font-family:var(--n-mono);font-size:11.5px;color:var(--n-fg-3);white-space:nowrap}

/* pull quote */
.pull{text-align:center}
.pull p{
  font-family:var(--n-serif);font-size:clamp(18px,4.6vw,23px);
  line-height:1.95;color:var(--n-fg);
}
.pull cite{
  display:block;margin-top:1.2em;font-style:normal;
  font-family:var(--n-mono);font-size:11px;letter-spacing:.28em;color:var(--n-fg-3);
}

/* ---------- 13. Mobile ---------- */
@media (max-width:560px){
  .rtop{height:52px;gap:8px}
  .rtop__ttl{font-size:12.5px}
  .prose{line-height:1.88}
  .prose p{margin-bottom:1.02em;text-align:left}
  .cnav{grid-template-columns:1fr 1fr;gap:9px}
  .cnav__c{grid-column:1 / -1;grid-row:2;min-height:44px}
  .cnav a{min-height:58px;padding:11px 13px}
  .cnav__v{font-size:13.5px}
  .ad{padding:1.25em 1.15em;margin:1.9em auto 2.2em}
  .sheet{
    right:10px;left:10px;bottom:10px;width:auto;
    padding-bottom:calc(18px + env(safe-area-inset-bottom));
  }
  .sect{padding-top:clamp(34px,9vw,52px);padding-bottom:clamp(34px,9vw,52px)}
  .toc a{grid-template-columns:auto 1fr;gap:12px}
  .toc__w{display:none}
}
@media (max-width:380px){
  .cover__ttl{letter-spacing:.04em}
  .seg button{min-width:38px;padding:7px 9px}
}

/* 打印：只留正文 */
@media print{
  .rtop,.rprog,.sheet,.cnav,.rfoot,.cover__glow,.btn-read{display:none!important}
  body{background:#fff;color:#000}
  body::before{display:none}
  .prose{font-size:11.5pt;line-height:1.7}
  .ad{border-color:#bbb;background:none}
}