/* ============================================================
   聚合稳定入口 · 共享样式表 /assets/site.css
   母题：重庆山城夜景 · 纵向叙事长卷 · 纸张叠层 · 印刷标签
   ============================================================ */

/* ---------- 1. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:98px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 设计令牌 ---------- */
:root{
  --fog-blue:#1B4F72;
  --fog-blue-deep:#143D59;
  --fog-blue-ink:#0B2738;
  --neon:#FF6B2C;
  --neon-soft:#FFC9A8;
  --charcoal:#101418;
  --warm:#F8F4EC;
  --paper:#E6E1D8;
  --mist:#D6E6F2;
  --steel:#57708A;
  --ink:#050708;
  --ok:#2E7D5B;

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:var(--font-display);
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono","Courier New",monospace;

  --shell:1240px;
  --gut:clamp(1.05rem,3.6vw,2.6rem);
  --hdr-h:66px;
  --radius:2px;
  --rule:1px solid rgba(16,20,24,.14);
  --sheet-shadow:8px 8px 0 -1px var(--paper),8px 8px 0 0 rgba(16,20,24,.1);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. 中文排版 ---------- */
body{
  background:var(--warm);
  color:var(--charcoal);
  font-family:var(--font-body);
  font-size:clamp(1rem,.32vw + .92rem,1.1rem);
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.16;letter-spacing:-.01em;color:var(--charcoal)}
h1{font-size:clamp(2.6rem,8vw,6rem)}
h2{font-size:clamp(1.8rem,4vw,3rem)}
h3{font-size:1.35rem;font-weight:800}
h4{font-size:1.05rem;font-weight:800;letter-spacing:0}
p{text-wrap:pretty}
strong{font-weight:800}
.mono{font-family:var(--font-mono);font-size:.82rem;letter-spacing:.08em}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}

:focus-visible{outline:3px solid var(--neon);outline-offset:2px;border-radius:var(--radius)}

/* ---------- 4. 容器与色带 ---------- */
.shell{width:min(100% - (var(--gut) * 2),var(--shell));margin-inline:auto}
.shell--narrow{width:min(100% - (var(--gut) * 2),780px);margin-inline:auto}
.section{padding-block:clamp(2.8rem,7vw,5.5rem)}
.section--tight{padding-block:clamp(1.6rem,4vw,2.6rem)}
.section--mist{background:var(--mist)}
.section--paper{background:var(--paper)}
.section--blue{background:linear-gradient(180deg,var(--fog-blue) 0%,var(--fog-blue-ink) 100%);color:rgba(248,244,236,.86)}
.section--ink{background:var(--ink);color:rgba(248,244,236,.8)}
.section--blue h1,.section--blue h2,.section--blue h3,.section--blue h4,
.section--ink h1,.section--ink h2,.section--ink h3,.section--ink h4{color:var(--warm)}

/* ---------- 5. 页头：紧凑命令栏 ---------- */
.skip-link{
  position:fixed;top:0;left:0;z-index:300;
  transform:translateY(-130%);
  padding:.8rem 1.2rem;
  background:var(--neon);color:#0B1014;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.12em;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.site-header{
  position:sticky;top:0;z-index:120;
  background:linear-gradient(180deg,var(--fog-blue) 0%,var(--fog-blue-deep) 100%);
  color:var(--warm);
  border-bottom:2px solid rgba(5,7,8,.55);
  box-shadow:0 20px 34px -28px rgba(5,7,8,.95);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-6px;height:4px;pointer-events:none;
  background:repeating-linear-gradient(90deg,var(--paper) 0 18px,var(--mist) 18px 30px,var(--fog-blue) 30px 54px);
  opacity:.75;
}
.progress-rail{position:absolute;top:0;left:0;right:0;height:3px;background:rgba(248,244,236,.14)}
.progress-rail__bar{
  display:block;height:100%;width:100%;
  background:var(--neon);
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .14s linear;
}
.cmdbar{border-top:1px solid rgba(248,244,236,.1)}
.cmdbar__inner{
  width:min(100% - (var(--gut) * 2),var(--shell));
  margin-inline:auto;
  display:flex;align-items:center;flex-wrap:nowrap;gap:.4rem .9rem;
  min-height:var(--hdr-h);
  padding-block:.6rem;
}

.brand{display:flex;align-items:center;gap:.62rem;flex:0 0 auto}
.brand__mark{
  position:relative;width:36px;height:36px;flex:0 0 auto;
  display:grid;place-items:center;
  background:var(--neon);color:#0B1014;
  font-family:var(--font-display);font-weight:900;font-size:1.12rem;line-height:1;
  border:1px solid rgba(5,7,8,.4);
}
.brand__mark::after{
  content:"";position:absolute;inset:4px -4px -4px 4px;
  border:1px solid rgba(248,244,236,.5);
}
.brand__text{display:flex;flex-direction:column;gap:.1rem}
.brand__name{font-size:.98rem;font-weight:900;letter-spacing:.02em;line-height:1.2;color:var(--warm)}
.brand__meta{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.22em;text-transform:uppercase;color:rgba(214,230,242,.66);line-height:1.2}

.cmdnav{flex:1 1 auto;min-width:0}
.cmdnav__list{display:flex;align-items:center;gap:.1rem;overflow-x:auto;scrollbar-width:none}
.cmdnav__list::-webkit-scrollbar{display:none}
.cmdnav__link{
  display:inline-flex;align-items:baseline;gap:.4rem;white-space:nowrap;
  padding:.5rem .58rem;
  border-bottom:2px solid transparent;
  font-size:.92rem;font-weight:500;color:rgba(248,244,236,.8);
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.cmdnav__idx{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.08em;color:var(--neon-soft);opacity:.8}
.cmdnav__link:hover{color:#fff;background:rgba(248,244,236,.09)}
.cmdnav__link:focus-visible{outline-offset:-2px}
.cmdnav__link[aria-current="page"]{
  color:#fff;background:rgba(248,244,236,.12);border-bottom-color:var(--neon);
}
.cmdnav__link[aria-current="page"] .cmdnav__idx{color:var(--neon);opacity:1}

.search-slot{
  flex:0 1 232px;min-width:0;
  display:flex;align-items:center;gap:.5rem;
  padding:.5rem .7rem;
  background:rgba(214,230,242,.12);
  border:1px dashed rgba(214,230,242,.45);
  border-radius:var(--radius);
  color:rgba(248,244,236,.78);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.02em;
  transition:border-color .18s var(--ease),background .18s var(--ease),color .18s var(--ease);
}
.search-slot:hover,.search-slot:focus-visible{border-color:var(--neon);background:rgba(255,107,44,.16);color:#fff}
.search-slot__icon{position:relative;flex:0 0 auto;width:12px;height:12px;border:1.5px solid currentColor;border-radius:50%}
.search-slot__icon::after{content:"";position:absolute;right:-4px;bottom:-3px;width:5px;height:1.5px;background:currentColor;transform:rotate(45deg)}
.search-slot__label{flex:0 0 auto;color:var(--neon-soft);letter-spacing:.14em}
.search-slot__text{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:rgba(248,244,236,.62)}

.cmdbar__actions{display:flex;align-items:center;gap:.5rem;flex:0 0 auto}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;
  padding:.66rem 1.05rem;
  font-family:var(--font-body);font-size:.86rem;font-weight:600;line-height:1;
  border:1px solid transparent;border-radius:var(--radius);
  transition:transform .16s var(--ease),background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),box-shadow .16s var(--ease);
}
.btn--accent{background:var(--neon);color:#0B1014;border-color:rgba(5,7,8,.45);box-shadow:3px 3px 0 rgba(5,7,8,.45)}
.btn--accent:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 rgba(5,7,8,.5)}
.btn--accent:active{transform:translate(0,0);box-shadow:2px 2px 0 rgba(5,7,8,.5)}
.btn--ghost{background:transparent;color:var(--warm);border-color:rgba(248,244,236,.45)}
.btn--ghost:hover{background:rgba(248,244,236,.14);border-color:var(--warm)}
.btn--blue{background:var(--fog-blue);color:var(--warm);border-color:rgba(5,7,8,.4)}
.btn--blue:hover{background:var(--fog-blue-ink)}
.btn--line{background:transparent;color:var(--charcoal);border-color:rgba(16,20,24,.3)}
.btn--line:hover{border-color:var(--fog-blue);color:var(--fog-blue)}
.cmdbar__cta{flex:0 0 auto}

.nav-toggle{
  display:none;flex-direction:column;align-items:center;justify-content:center;gap:4px;
  width:44px;height:40px;padding:0;flex:0 0 auto;
  background:rgba(248,244,236,.1);
  border:1px solid rgba(248,244,236,.42);border-radius:var(--radius);
}
.nav-toggle:hover{background:rgba(248,244,236,.18)}
.nav-toggle__bar{display:block;width:18px;height:2px;background:var(--warm);transition:transform .22s var(--ease),opacity .22s var(--ease)}
.site-header[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,8vw,6rem);
  background:var(--ink);
  color:rgba(248,244,236,.76);
  border-top:4px solid var(--fog-blue);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:-9px;height:5px;pointer-events:none;
  background:repeating-linear-gradient(90deg,var(--paper) 0 18px,var(--mist) 18px 30px,var(--fog-blue) 30px 54px);
  opacity:.7;
}
.footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(0,1.7fr) minmax(0,1fr);
  gap:clamp(1.8rem,4vw,3.2rem);
  padding-block:clamp(2.4rem,6vw,4rem);
}
.footer__brand{min-width:0}
.footer__wordmark{font-family:var(--font-display);font-weight:900;font-size:clamp(1.35rem,3vw,1.9rem);line-height:1.2;letter-spacing:.01em;color:var(--warm)}
.footer__summary{margin-top:.9rem;max-width:40ch;font-size:.92rem;line-height:1.85;color:rgba(248,244,236,.64)}
.footer__coords{margin-top:1.1rem;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.2em;text-transform:uppercase;color:var(--steel)}
.footer__linkgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.4rem}
.footer__group{min-width:0}
.footer__grouptitle{
  padding-bottom:.6rem;margin-bottom:.85rem;
  border-bottom:1px solid rgba(248,244,236,.16);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;color:var(--neon-soft);
}
.footer__list{display:grid;gap:.5rem}
.footer__link{
  display:inline-flex;align-items:center;gap:.5rem;
  font-size:.92rem;color:rgba(248,244,236,.76);
  transition:color .16s var(--ease),transform .16s var(--ease);
}
.footer__link::before{content:"";width:7px;height:1px;background:var(--steel);transition:width .18s var(--ease),background .18s var(--ease)}
.footer__link:hover{color:#fff;transform:translateX(2px)}
.footer__link:hover::before{width:15px;background:var(--neon)}
.footer__contact{min-width:0}
.footer__contacttitle{
  padding-bottom:.6rem;margin-bottom:.85rem;
  border-bottom:1px solid rgba(248,244,236,.16);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;color:var(--neon-soft);
}
.footer__contactlist{display:grid;gap:.75rem}
.footer__contactitem{font-size:.88rem;line-height:1.7;color:rgba(248,244,236,.72);overflow-wrap:anywhere}
.footer__label{display:block;font-family:var(--font-mono);font-size:.64rem;letter-spacing:.16em;text-transform:uppercase;color:var(--steel)}
.footer__base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1.5rem;
  padding-block:1.2rem 1.7rem;
  border-top:1px solid rgba(248,244,236,.14);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;
}
.footer__icp{color:rgba(248,244,236,.58)}
.footer__copy{color:rgba(248,244,236,.42)}

/* ---------- 7. 通用组件 ---------- */
.chapter{display:grid;gap:.7rem;max-width:70ch;margin-bottom:clamp(1.4rem,3.5vw,2.4rem)}
.chapter__no{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.24em;text-transform:uppercase;color:var(--neon)}
.chapter__title{font-size:clamp(1.8rem,4vw,3rem);font-weight:900;line-height:1.14;letter-spacing:-.012em}
.chapter__note{max-width:52ch;font-size:.95rem;line-height:1.8;color:var(--steel)}
.section--blue .chapter__note,.section--ink .chapter__note{color:rgba(214,230,242,.7)}

.kicker{display:inline-flex;align-items:center;gap:.55rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--fog-blue)}
.kicker::before{content:"";flex:0 0 auto;width:24px;height:2px;background:var(--neon)}
.section--blue .kicker,.section--ink .kicker{color:var(--neon-soft)}

.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--steel)}
.crumbs li{display:flex;align-items:center;gap:.4rem}
.crumbs li:not(:last-child)::after{content:"/";color:rgba(87,112,138,.5)}
.crumbs a{color:var(--fog-blue)}
.crumbs a:hover{color:var(--neon)}
.crumbs__current{color:var(--charcoal);font-weight:700}

.grid{display:grid;gap:clamp(1rem,2.6vw,1.75rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

.sheet{
  position:relative;
  padding:clamp(1.15rem,2.8vw,1.9rem);
  background:var(--warm);
  border:var(--rule);
  border-radius:var(--radius);
  box-shadow:var(--sheet-shadow);
}
.sheet--paper{background:var(--paper)}
.sheet--blue{background:linear-gradient(160deg,var(--fog-blue),var(--fog-blue-ink));color:rgba(248,244,236,.88);border-color:rgba(5,7,8,.35);box-shadow:8px 8px 0 -1px var(--fog-blue-ink),8px 8px 0 0 rgba(5,7,8,.35)}
.sheet--blue h2,.sheet--blue h3,.sheet--blue h4{color:var(--warm)}
.sheet--ink{background:var(--charcoal);color:rgba(248,244,236,.84);border-color:rgba(5,7,8,.5);box-shadow:8px 8px 0 -1px var(--ink),8px 8px 0 0 rgba(5,7,8,.4)}
.sheet--ink h2,.sheet--ink h3,.sheet--ink h4{color:var(--warm)}
.sheet--flat{box-shadow:none}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.24rem .55rem;line-height:1.5;
  background:var(--paper);border:1px solid rgba(16,20,24,.16);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--fog-blue);
}
.tag--neon{background:var(--neon-soft);border-color:rgba(255,107,44,.45);color:#8A3208}
.tag--ok{background:rgba(46,125,91,.12);border-color:rgba(46,125,91,.36);color:var(--ok)}
.tag--ink{background:rgba(248,244,236,.1);border-color:rgba(248,244,236,.3);color:var(--warm)}

.media{
  position:relative;overflow:hidden;
  border:1px solid rgba(16,20,24,.22);border-radius:var(--radius);
  background:linear-gradient(150deg,var(--fog-blue) 0%,var(--fog-blue-ink) 58%,var(--ink) 100%);
}
.media::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(214,230,242,.07) 0 1px,transparent 1px 42px);
}
.media img{position:relative;width:100%;height:100%;object-fit:cover}
.media--hero{aspect-ratio:21/9}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media__cap{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:.85rem 1rem;
  background:linear-gradient(0deg,rgba(5,7,8,.86),rgba(5,7,8,0));
  color:var(--warm);font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;
}
.media__trail{
  position:absolute;inset:0;z-index:1;pointer-events:none;mix-blend-mode:screen;
  background:linear-gradient(104deg,transparent 38%,rgba(255,107,44,.22) 50%,transparent 62%);
}

.prose{max-width:74ch;font-size:1.04rem;line-height:1.85;color:#232A31}
.prose>*+*{margin-top:1.15em}
.prose h2{font-size:clamp(1.45rem,3vw,2rem);margin-top:2em}
.prose h3{margin-top:1.6em}
.prose ul,.prose ol{display:grid;gap:.6em}
.prose li{position:relative;padding-left:1.25rem}
.prose li::before{content:"";position:absolute;left:0;top:.86em;width:9px;height:2px;background:var(--neon)}
.prose a{color:var(--fog-blue);border-bottom:1px solid rgba(27,79,114,.4)}
.prose a:hover{color:var(--neon);border-bottom-color:var(--neon)}
.prose blockquote{padding-left:1.1rem;border-left:3px solid var(--neon);color:var(--steel)}
.section--blue .prose,.section--ink .prose{color:rgba(248,244,236,.8)}
.section--blue .prose a,.section--ink .prose a{color:var(--neon-soft);border-bottom-color:rgba(255,201,168,.5)}

.tabs{display:grid;gap:1.25rem}
.tabs__list{display:flex;flex-wrap:wrap;gap:.4rem;padding-bottom:.7rem;border-bottom:1px solid rgba(16,20,24,.16)}
.tabs__btn{
  padding:.5rem .9rem;
  background:rgba(248,244,236,.6);border:1px solid rgba(16,20,24,.16);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.08em;color:var(--fog-blue);
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.tabs__btn:hover{border-color:var(--fog-blue)}
.tabs__btn[aria-selected="true"]{background:var(--fog-blue);border-color:var(--fog-blue);color:var(--warm)}
.tabs__panel[hidden]{display:none}
.tabs__panel.is-enter{animation:tabsIn .34s var(--ease) both}
@keyframes tabsIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------- 8. 动效协议 ---------- */
[data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .55s var(--ease),transform .55s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}
[data-chapter-link]{transition:color .18s var(--ease),border-color .18s var(--ease)}
[data-chapter-link][aria-current="true"]{color:var(--neon);border-color:var(--neon)}

/* ---------- 9. 断点 ---------- */
@media (min-width:961px){
  .grid--stagger>*:nth-child(even){margin-top:2.4rem}
}
@media (max-width:1100px){
  .search-slot{flex-basis:180px}
  .search-slot__text{display:none}
}
@media (max-width:1024px){
  .footer__grid{grid-template-columns:minmax(0,1fr) minmax(0,1.25fr)}
  .footer__contact{grid-column:1 / -1}
}
@media (max-width:900px){
  .cmdbar__inner{flex-wrap:wrap;gap:.55rem .65rem;padding-block:.6rem}
  .brand{order:1;flex:1 1 auto}
  .cmdbar__actions{order:2;margin-left:auto}
  .search-slot{order:3;flex:1 1 100%;justify-content:flex-start}
  .search-slot__text{display:block}
  .nav-toggle{display:flex}
  .cmdnav{
    order:4;flex:1 1 100%;
    max-height:0;overflow:hidden;
    opacity:0;visibility:hidden;
    transition:max-height .3s var(--ease),opacity .24s var(--ease),visibility .3s var(--ease);
  }
  .site-header[data-open] .cmdnav{
    max-height:62vh;overflow-y:auto;
    opacity:1;visibility:visible;
    padding-top:.5rem;
    border-top:1px solid rgba(248,244,236,.18);
  }
  .cmdnav__list{flex-direction:column;align-items:stretch;gap:0}
  .cmdnav__link{
    justify-content:flex-start;
    padding:.72rem .2rem;
    font-size:1rem;
    border-bottom:1px solid rgba(248,244,236,.12);
  }
  .cmdnav__idx{min-width:2.4ch}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  .footer__grid{grid-template-columns:minmax(0,1fr)}
  .footer__linkgrid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .media--hero{aspect-ratio:4/3}
}
@media (max-width:640px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer__base{justify-content:flex-start}
}
@media (max-width:480px){
  .brand__meta{display:none}
  .cmdbar__cta{padding:.56rem .72rem;font-size:.8rem}
  .footer__linkgrid{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 10. 偏好与降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .progress-rail__bar{transition:none}
}