/* ========== 01 变量 ========== */
:root{
  --ink:#0E1114;
  --paper:#F3E9DB;
  --paper-ink:#16191C;
  --brown:#22160F;
  --panel:#14181C;
  --orange:#FF5A1F;
  --orange-deep:#B93A0D;
  --green:#2FA36B;
  --blue:#3FA9F5;
  --lime:#D9FF3D;
  --muted:#A8B0B6;
  --text:#EDE6DB;
  --line:#2A3138;
  --line-soft:rgba(243,233,219,.14);
  --shell:1180px;
  --shell-wide:1440px;
  --gutter:clamp(18px,4vw,48px);
  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-num:"JetBrains Mono","IBM Plex Mono","Roboto Mono",monospace;
}

/* ========== 02 Reset ========== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
[data-chapter],.section[id]{scroll-margin-top:118px}

/* ========== 03 基础排版 ========== */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    linear-gradient(180deg,rgba(255,90,31,.08),rgba(14,17,20,0) 380px),
    repeating-linear-gradient(90deg,rgba(255,255,255,.022) 0 1px,transparent 1px 96px);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.24;letter-spacing:-.02em;color:var(--paper);text-wrap:balance}
h1{font-size:clamp(30px,4.4vw,52px)}
h2{font-size:clamp(24px,3.2vw,34px)}
h3{font-size:clamp(19px,2.2vw,24px)}
p{text-wrap:pretty}
strong{color:var(--paper);font-weight:700}
::selection{background:var(--lime);color:var(--ink)}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px}

/* ========== 04 工具类 ========== */
.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}
.skip-link{
  position:absolute;left:12px;top:-120px;z-index:200;
  padding:10px 18px;background:var(--lime);color:var(--ink);
  border:2px solid var(--ink);font-weight:700;font-size:14px;
  transition:top .12s ease;
}
.skip-link:focus{top:10px}
.container{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}
.container--wide{max-width:var(--shell-wide)}
.container--narrow{max-width:760px}
.section{padding:clamp(48px,7vw,104px) 0}
.section--tight{padding:clamp(30px,4vw,56px) 0}
.section--paper{background:var(--paper);color:var(--paper-ink)}
.section--paper h1,.section--paper h2,.section--paper h3,.section--paper .chapter__title,.section--paper .card__title{color:var(--paper-ink)}
.section--paper .chapter{border-bottom-color:rgba(22,25,28,.22)}
.section--paper .chapter__note,.section--paper .lead,.section--paper .card__text{color:#4A5057}
.section--brown{background:var(--brown)}
.stack{display:flex;flex-direction:column;gap:var(--gap,18px)}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:var(--gap,12px)}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.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))}
.editorial{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,9fr);gap:clamp(20px,3.4vw,48px);align-items:start}
.editorial--mirror{grid-template-columns:minmax(0,9fr) minmax(0,3fr)}
.divider{height:2px;background:var(--line);border:0;margin:0}
.mono{font-family:var(--font-num);letter-spacing:.02em}
.num{font-family:var(--font-num);letter-spacing:.02em;color:var(--lime)}
.lead{font-size:clamp(17px,1.6vw,19px);line-height:1.8;color:#E4DCD0;max-width:62ch}
.note{border-left:3px solid var(--orange);padding:4px 0 4px 14px;font-size:14px;line-height:1.85;color:var(--muted)}

/* ========== 05 组件 ========== */
.frame{position:relative;border:2px solid var(--line);background:rgba(20,24,28,.6)}
.frame::before,.frame::after{content:"";position:absolute;width:16px;height:16px;pointer-events:none}
.frame::before{top:-2px;left:-2px;border-top:3px solid var(--orange);border-left:3px solid var(--orange)}
.frame::after{bottom:-2px;right:-2px;border-bottom:3px solid var(--orange);border-right:3px solid var(--orange)}

.media{
  position:relative;display:block;overflow:hidden;
  border:2px solid var(--line);background-color:var(--panel);
  background-image:repeating-linear-gradient(135deg,rgba(255,255,255,.05) 0 2px,transparent 2px 12px);
}
.media img{width:100%;height:100%;object-fit:cover}
.media--21x9{aspect-ratio:21/9}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media__tag{
  position:absolute;left:12px;top:12px;z-index:2;
  padding:3px 9px;background:var(--ink);border:2px solid var(--lime);color:var(--lime);
  font-family:var(--font-num);font-size:12px;letter-spacing:.06em;
}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:10px 14px;background:rgba(14,17,20,.86);border-top:2px solid var(--orange);
  font-family:var(--font-num);font-size:12px;color:var(--muted);letter-spacing:.04em;
}

.plate{background:var(--paper);color:var(--paper-ink);border:2px solid var(--paper-ink);padding:16px 18px;box-shadow:6px 6px 0 rgba(0,0,0,.5)}
.plate__label{font-family:var(--font-num);font-size:12px;letter-spacing:.14em;color:var(--orange-deep)}
.plate__title{font-family:var(--font-display);font-weight:800;font-size:18px;margin-top:6px;color:var(--paper-ink)}
.plate__text{font-size:14px;line-height:1.75;margin-top:6px;color:#3A3F44}

.card{
  position:relative;display:flex;flex-direction:column;gap:12px;padding:22px;
  background:var(--panel);border:2px solid var(--line);
  transition:border-color .12s ease,transform .12s ease,box-shadow .12s ease;
}
.card:hover{border-color:var(--orange);box-shadow:6px 6px 0 rgba(255,90,31,.22);transform:translate(-2px,-2px)}
.card__top{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.card__title{font-family:var(--font-display);font-weight:800;font-size:20px;line-height:1.35;color:var(--paper)}
.card__text{font-size:15px;line-height:1.8;color:var(--muted)}
.card__meta{font-family:var(--font-num);font-size:12px;letter-spacing:.04em;color:var(--muted)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border:2px solid var(--line);color:var(--muted);font-family:var(--font-num);font-size:12px;letter-spacing:.06em;white-space:nowrap}
.tag--live{color:var(--lime);border-color:rgba(217,255,61,.55)}
.tag--done{color:var(--green);border-color:rgba(47,163,107,.55)}
.tag--ios{color:var(--blue);border-color:rgba(63,169,245,.55)}
.tag--hot{color:var(--orange);border-color:rgba(255,90,31,.55)}
.chip{
  display:inline-flex;align-items:center;gap:8px;padding:6px 14px;
  border:2px solid var(--line);color:var(--muted);font-size:14px;font-weight:500;
  transition:border-color .12s ease,color .12s ease,background-color .12s ease;
}
.chip:hover{border-color:var(--orange);color:var(--orange)}
.chip[aria-pressed="true"],.chip.is-active{background:var(--orange);border-color:var(--orange);color:var(--ink)}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__num{font-family:var(--font-num);font-weight:700;font-size:clamp(28px,4vw,46px);line-height:1;color:var(--lime);letter-spacing:.02em}
.stat__label{font-family:var(--font-num);font-size:12px;letter-spacing:.1em;color:var(--muted)}

.chapter{display:flex;align-items:flex-end;gap:18px;padding-bottom:16px;border-bottom:2px solid var(--line);margin-bottom:28px}
.chapter__num{font-family:var(--font-num);font-weight:700;font-size:clamp(46px,7vw,92px);line-height:.82;color:var(--orange);letter-spacing:-.02em}
.chapter__title{font-family:var(--font-display);font-weight:800;font-size:clamp(24px,3.2vw,34px);color:var(--paper)}
.chapter__note{margin-left:auto;font-family:var(--font-num);font-size:12px;letter-spacing:.08em;color:var(--muted);text-align:right}
[data-chapter].is-current .chapter__num{color:var(--lime)}
[data-chapter].is-current .chapter__title{text-shadow:0 0 18px rgba(255,90,31,.28)}

.prose{
  background:var(--paper);color:var(--paper-ink);border:2px solid var(--paper-ink);
  padding:clamp(22px,3.6vw,52px);box-shadow:8px 8px 0 rgba(0,0,0,.5);
}
.prose h2,.prose h3{color:var(--paper-ink)}
.prose h2{margin-top:1.6em;font-size:clamp(21px,2.4vw,28px)}
.prose h3{margin-top:1.4em;font-size:19px}
.prose p,.prose li{font-size:16px;line-height:1.85}
.prose p+p{margin-top:1em}
.prose ul{margin:1em 0;padding-left:0}
.prose ul li{position:relative;padding-left:20px;margin-top:.5em}
.prose ul li::before{content:"—";position:absolute;left:0;color:var(--orange-deep);font-family:var(--font-num)}
.prose a{color:var(--orange-deep);border-bottom:2px solid var(--orange-deep)}
.prose a:hover{color:var(--paper-ink);border-bottom-color:var(--paper-ink)}

.index-list{border-top:2px solid var(--line)}
.index-list__item{display:flex;gap:14px;align-items:baseline;padding:13px 2px;border-bottom:2px solid var(--line)}
.index-list__num{flex:0 0 auto;font-family:var(--font-num);font-size:13px;letter-spacing:.06em;color:var(--orange)}
.index-list__link{flex:1 1 auto;min-width:0;font-size:16px;color:var(--paper)}
.index-list__link:hover{color:var(--orange)}
.index-list__link[aria-current="true"]{color:var(--lime)}
.index-list__time{flex:0 0 auto;font-family:var(--font-num);font-size:12px;color:var(--muted)}

.disclose{border:2px solid var(--line);background:var(--panel)}
.disclose+.disclose{margin-top:12px}
.disclose__sum{
  display:flex;align-items:center;gap:12px;padding:16px 18px;cursor:pointer;list-style:none;
  font-family:var(--font-display);font-weight:700;font-size:17px;color:var(--paper);
}
.disclose__sum::-webkit-details-marker{display:none}
.disclose__sum::before{content:"+";font-family:var(--font-num);color:var(--orange);font-size:18px}
.disclose[open] .disclose__sum{border-bottom:2px solid var(--line)}
.disclose[open] .disclose__sum::before{content:"–";color:var(--lime)}
.disclose__body{padding:16px 18px;font-size:15px;line-height:1.85;color:var(--muted)}

.breadcrumb{padding:14px 0;border-bottom:2px solid var(--line);font-family:var(--font-num);font-size:12px;letter-spacing:.06em;color:var(--muted)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:flex;align-items:center;gap:8px}
.breadcrumb__sep{color:var(--orange)}
.breadcrumb__link{color:var(--muted)}
.breadcrumb__link:hover{color:var(--orange)}
.breadcrumb__current{color:var(--paper)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:0 22px;border:2px solid var(--paper);color:var(--paper);
  font-family:var(--font-sans);font-size:15px;font-weight:600;letter-spacing:.02em;
  transition:transform .12s ease,box-shadow .12s ease,background-color .12s ease,color .12s ease,border-color .12s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 rgba(255,90,31,.35);border-color:var(--orange);color:var(--orange)}
.btn--primary{background:var(--orange);border-color:var(--orange);color:var(--ink)}
.btn--primary:hover{background:var(--orange-deep);border-color:var(--orange-deep);color:var(--paper);box-shadow:5px 5px 0 rgba(217,255,61,.3)}
.btn--ghost{background:transparent;border-color:var(--muted);color:var(--paper)}
.btn--block{width:100%}

/* ========== 06 头部 ========== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(14,17,20,.95);
  border-bottom:2px solid var(--brown);
  backdrop-filter:blur(8px);
}
.site-header__inner{
  position:relative;
  display:flex;align-items:stretch;justify-content:space-between;gap:16px;
  width:100%;max-width:var(--shell-wide);min-height:84px;
  margin:0 auto;padding:0 var(--gutter);
}
.site-header__brand{display:flex;align-items:center;gap:18px;min-width:0}
.brand{display:flex;align-items:center;gap:14px;padding:14px 0;min-width:0}
.brand__mark{
  display:grid;place-items:center;flex:0 0 auto;width:44px;height:44px;
  background:var(--brown);border:2px solid var(--orange);color:var(--orange);
  font-family:var(--font-num);font-weight:700;font-size:20px;
  box-shadow:4px 4px 0 rgba(255,90,31,.18);
  transition:background-color .12s ease,color .12s ease;
}
.brand__text{display:flex;flex-direction:column;min-width:0;line-height:1.25}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em;color:var(--paper);transition:color .12s ease}
.brand__line{font-family:var(--font-num);font-size:12px;letter-spacing:.06em;color:var(--muted);white-space:nowrap}
.brand:hover .brand__mark{background:var(--orange);color:var(--ink)}
.brand:hover .brand__name{color:var(--orange)}
.header-meta{
  display:inline-flex;align-items:center;gap:8px;padding:5px 10px;
  border:2px solid var(--line);color:var(--muted);
  font-family:var(--font-num);font-size:12px;letter-spacing:.04em;white-space:nowrap;
}
.header-meta__dot{width:8px;height:8px;flex:0 0 auto;background:var(--green);box-shadow:0 0 0 3px rgba(47,163,107,.22)}
.header-meta__value{color:var(--lime)}
.nav-toggle{
  display:none;align-items:center;gap:10px;align-self:center;
  padding:10px 14px;border:2px solid var(--orange);color:var(--orange);
  font-family:var(--font-num);font-size:13px;letter-spacing:.08em;
  transition:background-color .12s ease,color .12s ease;
}
.nav-toggle__bars{position:relative;width:20px;height:12px;border-top:2px solid currentColor;border-bottom:2px solid currentColor}
.nav-toggle__bars::after{content:"";position:absolute;left:0;right:0;top:4px;border-top:2px solid currentColor}
.site-header[data-open] .nav-toggle{background:var(--orange);color:var(--ink)}
.site-nav{display:flex;align-items:center;gap:18px;align-self:stretch}
.site-nav__list{display:flex;align-items:stretch;height:100%}
.site-nav__item{display:flex}
.site-nav__link{
  display:flex;align-items:center;height:100%;padding:0 16px;
  border-bottom:3px solid transparent;
  color:var(--muted);font-size:15px;font-weight:500;
  transition:color .12s ease,border-color .12s ease,background-color .12s ease;
}
.site-nav__link:hover{color:var(--paper);border-bottom-color:var(--orange)}
.site-nav__link[aria-current="page"]{background:var(--orange);color:var(--ink);font-weight:700;border-bottom-color:var(--lime)}
.site-nav__foot{
  display:flex;flex-direction:column;gap:3px;align-self:center;
  padding-left:18px;border-left:2px solid var(--line);
  font-family:var(--font-num);font-size:12px;letter-spacing:.04em;color:var(--muted);
}
.site-nav__tag{white-space:nowrap}
.site-nav__tag--ios{color:var(--blue)}
.scroll-meter{
  height:3px;width:100%;
  background-image:linear-gradient(90deg,var(--orange),var(--lime));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .1s linear;
}

/* ========== 07 页脚 ========== */
.site-footer{position:relative;background:var(--brown);border-top:2px solid var(--orange);color:var(--muted)}
.site-footer__inner{max-width:var(--shell-wide);margin:0 auto;padding:clamp(36px,6vw,72px) var(--gutter) 26px}
.site-footer__top{
  display:grid;grid-template-columns:minmax(230px,1.5fr) repeat(3,minmax(110px,1fr));
  gap:clamp(20px,4vw,48px);
  padding-bottom:30px;border-bottom:2px solid var(--line-soft);
}
.site-footer__brand{display:flex;flex-direction:column;gap:12px}
.brand--footer{padding:0}
.brand--footer .brand__name{font-size:18px}
.site-footer__lines{font-family:var(--font-num);font-size:12px;letter-spacing:.08em;color:var(--muted)}
.site-footer__title{
  font-family:var(--font-num);font-size:12px;font-weight:700;letter-spacing:.14em;
  color:var(--orange);margin-bottom:14px;
}
.site-footer__list{display:flex;flex-direction:column;gap:10px}
.site-footer__link{display:inline-block;font-size:15px;color:var(--paper);opacity:.78;border-bottom:2px solid transparent;transition:opacity .12s ease,color .12s ease,border-color .12s ease}
.site-footer__link:hover{opacity:1;color:var(--orange);border-bottom-color:var(--orange)}
.site-footer__link[aria-current="page"]{color:var(--lime);opacity:1}
.site-footer__contact{
  display:flex;flex-wrap:wrap;gap:14px 30px;align-items:center;
  padding:24px 0;border-bottom:2px solid var(--line-soft);
}
.contact-item{display:flex;align-items:center;gap:10px;min-width:0;max-width:100%}
.contact-item__label{font-family:var(--font-num);font-size:12px;letter-spacing:.08em;color:var(--orange);white-space:nowrap}
.contact-item__text{font-size:14px;color:var(--paper)}
.copy-btn{
  display:inline-flex;align-items:center;gap:8px;max-width:100%;
  padding:6px 12px;border:2px solid var(--line);color:var(--paper);
  font-family:var(--font-num);font-size:13px;letter-spacing:.02em;
  transition:border-color .12s ease,color .12s ease,background-color .12s ease;
}
.copy-btn__value{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.copy-btn:hover{border-color:var(--orange);color:var(--orange)}
.copy-btn[data-state="copied"]{border-color:var(--green);color:var(--green)}
.copy-btn__hint{font-size:12px;color:var(--green);white-space:nowrap}
.copy-btn__hint:empty{display:none}
.site-footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  padding-top:20px;
}
.site-footer__legal-text{font-family:var(--font-num);font-size:12px;letter-spacing:.03em;color:var(--muted)}
.site-footer__inline{color:var(--orange);border-bottom:2px solid var(--orange-deep)}
.site-footer__inline:hover{color:var(--lime);border-bottom-color:var(--lime)}
.to-top{
  position:fixed;right:clamp(14px,3vw,28px);bottom:clamp(14px,3vw,28px);z-index:70;
  display:inline-flex;align-items:center;gap:10px;padding:10px 14px;
  background:var(--ink);border:2px solid var(--orange);color:var(--paper);
  font-family:var(--font-num);font-size:12px;letter-spacing:.08em;
  box-shadow:5px 5px 0 rgba(255,90,31,.25);
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .15s ease,transform .15s ease,visibility .15s ease,background-color .12s ease,color .12s ease;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--orange);color:var(--ink)}
.to-top__num{color:var(--lime)}
.to-top:hover .to-top__num{color:var(--ink)}

/* ========== 08 显现与响应式 ========== */
.has-js [data-reveal]{opacity:0;transform:translateY(10px);transition:opacity .4s ease,transform .4s ease}
.has-js [data-reveal].is-in{opacity:1;transform:none}

@media (max-width:1100px){
  .header-meta{display:none}
}
@media (max-width:1000px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__top{grid-template-columns:minmax(200px,1.3fr) repeat(2,minmax(110px,1fr))}
}
@media (max-width:960px){
  .site-header__inner{min-height:70px}
  .site-header__brand{gap:12px}
  .brand{padding:10px 0}
  .brand__mark{width:38px;height:38px;font-size:17px}
  .brand__name{font-size:17px}
  .brand__line{font-size:11px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    flex-direction:column;align-items:stretch;gap:0;
    max-height:calc(100vh - 70px);overflow:auto;
    padding:8px var(--gutter) 22px;
    background:var(--brown);
    border-top:2px solid var(--orange);border-bottom:2px solid var(--orange);
    box-shadow:0 20px 0 rgba(0,0,0,.35);
  }
  .site-header[data-open] .site-nav{display:flex}
  .site-nav__list{flex-direction:column;height:auto}
  .site-nav__item{display:block}
  .site-nav__link{padding:15px 6px;border-bottom:2px solid var(--line);border-left:3px solid transparent}
  .site-nav__link[aria-current="page"]{background:transparent;color:var(--orange);border-left-color:var(--orange);border-bottom-color:var(--line)}
  .site-nav__foot{flex-direction:row;flex-wrap:wrap;gap:14px;align-self:stretch;padding:16px 6px 0;border-left:0}
  .editorial,.editorial--mirror{grid-template-columns:1fr}
  .chapter{flex-wrap:wrap;align-items:baseline}
  .chapter__note{margin-left:0;width:100%;text-align:left}
}
@media (max-width:720px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .site-footer__top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__brand{grid-column:1 / -1}
  .site-footer__contact{flex-direction:column;align-items:flex-start;gap:12px}
  .site-footer__legal{flex-direction:column;align-items:flex-start}
  .container{padding:0 var(--gutter)}
  .to-top{padding:8px 12px;font-size:11px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    transition-duration:.01ms !important;
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .scroll-meter{transition:none}
}