/* ==========================================================================
   v4-xinpujing.com.cn — 共享样式表 /assets/site.css
   1 变量 · 2 Reset · 3 基础排版 · 4 布局器具 · 5 通用组件
   6 刊头 · 7 页脚 · 8 图片容器 · 9 动效与响应式
   ========================================================================== */

/* 1 变量 ------------------------------------------------------------------ */
:root{
  --ink:#0B1B33;
  --ink-2:#12294A;
  --ink-3:#16304F;
  --line:#24405F;
  --line-soft:rgba(36,64,95,.62);
  --gold:#C9A227;
  --gold-lift:#F0D77B;
  --cinnabar:#C0392B;
  --paper:#F5F3EE;
  --paper-line:#D9D3C7;
  --graphite:#1B2430;
  --graphite-soft:#3A4453;
  --muted:#8FA3B8;
  --jade:#2E7D74;

  --font-display:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-mono:"SFMono-Regular","JetBrains Mono",Menlo,Consolas,"Courier New",monospace;

  --wrap:1200px;
  --wrap-narrow:820px;
  --wrap-wide:1440px;
  --gutter:clamp(20px,5vw,56px);

  --ease:cubic-bezier(.2,.7,.3,1);
  --fast:.16s;
  --slow:.24s;
}

/* 2 Reset ---------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
img,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;}
ul,ol{list-style:none;margin:0;padding:0;}
h1,h2,h3,h4,p{margin:0;}
a{color:inherit;}

/* 3 基础排版 -------------------------------------------------------------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--paper);
  background-color:var(--ink);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.4;
  background-image:
    linear-gradient(to right,rgba(36,64,95,.55) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(36,64,95,.35) 1px,transparent 1px);
  background-size:clamp(64px,8vw,120px) clamp(64px,8vw,120px);
}
main{position:relative;z-index:1;display:block;}
#main-content{scroll-margin-top:140px;}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.25;
  letter-spacing:.01em;
  color:var(--paper);
}
h1{font-size:clamp(30px,4.4vw,52px);}
h2{font-size:clamp(24px,3vw,32px);}
h3{font-size:clamp(19px,2.2vw,24px);}
strong{font-weight:700;color:var(--paper);}
.mono,code{font-family:var(--font-mono);letter-spacing:.08em;}
::selection{background:var(--gold);color:var(--ink);}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px;}
.panel--paper :focus-visible{outline-color:#8A6A10;}

/* 跳跃链接 */
.skip-link{
  position:fixed;
  top:10px;
  left:50%;
  z-index:200;
  transform:translate(-50%,-180%);
  padding:11px 22px;
  background:var(--gold);
  color:var(--ink);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  transition:transform var(--fast) var(--ease);
}
.skip-link:focus{transform:translate(-50%,0);}

/* 4 布局器具 -------------------------------------------------------------- */
.wrap,.wrap--narrow,.wrap--wide{
  width:100%;
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.wrap{max-width:var(--wrap);}
.wrap--narrow{max-width:var(--wrap-narrow);}
.wrap--wide{max-width:var(--wrap-wide);}

.grid{display:grid;gap:clamp(18px,2.6vw,34px);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.grid--split{grid-template-columns:minmax(0,1fr) minmax(0,2.1fr);align-items:start;}
.hairline{border:0;height:1px;background:var(--line);margin:0;}

/* 5 通用组件 -------------------------------------------------------------- */
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--muted);
}

.sec-head{display:grid;gap:12px;max-width:64ch;}
.sec-num{
  display:block;
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(56px,9vw,116px);
  line-height:.92;
  letter-spacing:.02em;
  color:var(--gold);
  transition:color var(--slow) var(--ease);
}
.sec-title{font-size:clamp(22px,2.8vw,32px);}
.sec-note{margin:0;font-size:15px;line-height:1.8;color:var(--muted);}

.num-card{
  display:grid;
  gap:10px;
  padding:26px 22px 28px;
  background:var(--ink-2);
  border:1px solid var(--line);
  border-top:2px solid var(--gold);
  color:inherit;
  text-decoration:none;
  transition:transform var(--fast) var(--ease),border-color var(--fast) var(--ease),background-color var(--fast) var(--ease);
}
.num-card:hover,.num-card:focus-visible{
  transform:translateY(-2px);
  border-color:var(--gold);
  background-color:var(--ink-3);
}
.num-card__index{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.16em;
  color:var(--gold);
}
.num-card__title{font-family:var(--font-display);font-size:20px;font-weight:800;color:var(--paper);}
.num-card__text{margin:0;font-size:14px;line-height:1.7;color:var(--muted);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
}
.tag--old{color:#F0BDB4;border-color:var(--cinnabar);}
.tag--new{color:#F6E9B8;border-color:var(--gold);}
.tag--ok{color:#9FD8D1;border-color:var(--jade);}

.compare{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  border:1px solid var(--line);
  background:var(--ink-2);
}
.compare__col{padding:clamp(20px,2.6vw,30px);}
.compare__col + .compare__col{border-left:1px solid var(--line);}
.compare__head{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--gold);
}

.timeline{display:grid;gap:0;}
.timeline__item{
  position:relative;
  padding:0 0 28px 26px;
  border-left:1px solid var(--line);
}
.timeline__mark{
  position:absolute;
  left:-5px;
  top:7px;
  width:9px;
  height:9px;
  background:var(--gold);
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 26px;
  font-family:var(--font-sans);
  font-size:15px;
  font-weight:600;
  letter-spacing:.04em;
  text-decoration:none;
  cursor:pointer;
  border:1px solid var(--gold);
  background:linear-gradient(90deg,var(--gold),var(--gold-lift));
  color:var(--ink);
  transition:transform var(--fast) var(--ease),border-color var(--fast) var(--ease),color var(--fast) var(--ease),filter var(--fast) var(--ease);
}
.btn:hover{transform:translateY(-2px);filter:brightness(1.06);}
.btn--ghost{
  background:transparent;
  border-color:var(--line);
  color:var(--paper);
}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold-lift);}
.btn--quiet{
  padding:10px 18px;
  background:transparent;
  border-color:var(--line);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:400;
  letter-spacing:.08em;
}
.btn--quiet:hover{border-color:var(--gold);color:var(--gold-lift);}
.btn--sm{padding:10px 18px;font-size:13px;}

.breadcrumb{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:22px var(--gutter) 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--muted);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:8px;}
.breadcrumb__item{display:flex;align-items:center;gap:8px;}
.breadcrumb__sep{color:var(--line);}
.breadcrumb a{color:var(--muted);text-decoration:none;border-bottom:1px solid transparent;transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);}
.breadcrumb a:hover{color:var(--gold-lift);border-bottom-color:var(--gold);}
.breadcrumb [aria-current="page"]{color:var(--paper);}

.prose{max-width:68ch;font-size:16.5px;line-height:1.85;color:var(--muted);}
.prose h2,.prose h3{color:var(--paper);margin:2em 0 .6em;}
.prose h2:first-child,.prose h3:first-child{margin-top:0;}
.prose p{margin:0 0 1.5em;}
.prose a{color:var(--gold-lift);text-decoration:none;border-bottom:1px solid var(--gold);}

.spec-table{width:100%;border-collapse:collapse;font-size:15px;}
.spec-table th,.spec-table td{
  padding:14px 16px;
  text-align:left;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.spec-table th{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:400;
  letter-spacing:.14em;
  color:var(--gold);
}

.panel{
  padding:clamp(24px,4vw,48px);
  border:1px solid var(--line);
  background:var(--ink-2);
}
.panel--paper{
  background:var(--paper);
  border-color:var(--paper-line);
  color:var(--graphite);
}
.panel--paper h2,.panel--paper h3,.panel--paper .sec-title{color:var(--graphite);}
.panel--paper .prose{color:var(--graphite-soft);}
.panel--paper .sec-note{color:var(--graphite-soft);}

.status--ok{color:var(--jade);}

/* 6 刊头 ------------------------------------------------------------------ */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background-color:var(--ink);
  background-image:linear-gradient(to right,rgba(36,64,95,.45) 1px,transparent 1px);
  background-size:clamp(64px,8vw,120px) 100%;
  border-bottom:1px solid var(--line);
}
.site-header[data-condensed]{background-image:none;}

.header-rail{
  display:flex;
  align-items:center;
  gap:18px;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
  height:40px;
  max-height:40px;
  overflow:hidden;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--muted);
  transition:max-height var(--slow) var(--ease),opacity var(--fast) var(--ease);
}
.rail__mark{
  padding:1px 7px;
  border:1px solid var(--line);
  color:var(--gold);
  letter-spacing:.16em;
}
.rail__text{
  flex:1 1 auto;
  overflow:hidden;
  white-space:nowrap;
  text-overflow:ellipsis;
}
.rail__nav{display:flex;gap:20px;}
.rail__link{
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.rail__link:hover{color:var(--gold-lift);border-bottom-color:var(--gold);}

.masthead{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  justify-items:center;
  gap:12px;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:18px var(--gutter) 0;
  transition:padding var(--slow) var(--ease),gap var(--slow) var(--ease);
}

.brand{
  display:grid;
  justify-items:center;
  gap:5px;
  text-decoration:none;
}
.brand__name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(34px,4.6vw,54px);
  line-height:1;
  letter-spacing:.06em;
  color:var(--paper);
  transition:color var(--fast) var(--ease);
}
.brand:hover .brand__name{color:var(--gold-lift);}
.brand__sub{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--muted);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:8px 14px;
  border:1px solid var(--line);
  color:var(--paper);
  font-size:13px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:border-color var(--fast) var(--ease),color var(--fast) var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);color:var(--gold-lift);}
.nav-toggle__icon{
  position:relative;
  display:block;
  width:18px;
  height:9px;
}
.nav-toggle__icon::before,
.nav-toggle__icon::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:1.5px;
  background:currentColor;
  transition:transform var(--fast) var(--ease),top var(--fast) var(--ease);
}
.nav-toggle__icon::before{top:0;}
.nav-toggle__icon::after{top:8px;}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before{top:4px;transform:rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after{top:4px;transform:rotate(-45deg);}
.nav-toggle__label{line-height:1;}

.site-nav{
  width:100%;
  border-top:1px solid var(--line-soft);
}
.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:center;
  gap:clamp(10px,2.6vw,36px);
  padding:10px 0 16px;
}
.site-nav__link{
  display:inline-block;
  padding:6px 2px;
  font-size:15px;
  letter-spacing:.08em;
  color:var(--muted);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.site-nav__link:hover{color:var(--paper);border-bottom-color:var(--line);}
.site-nav__link[aria-current="page"]{color:var(--gold-lift);border-bottom-color:var(--gold);}

.header-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:transparent;
  pointer-events:none;
}
.header-progress span{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--gold),var(--gold-lift));
}

.site-header[data-condensed] .header-rail{
  max-height:0;
  opacity:0;
  border-bottom-color:transparent;
}
.site-header[data-condensed] .masthead{padding-top:10px;gap:6px;}
.site-header[data-condensed] .brand__name{font-size:clamp(22px,2.6vw,28px);}
.site-header[data-condensed] .brand__sub{display:none;}
.site-header[data-condensed] .site-nav__list{padding:6px 0 10px;}

/* 7 页脚 ------------------------------------------------------------------ */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(64px,10vw,140px);
  background-color:var(--ink-2);
  background-image:linear-gradient(to right,rgba(36,64,95,.5) 1px,transparent 1px);
  background-size:clamp(64px,8vw,120px) 100%;
  border-top:1px solid var(--line);
  color:var(--muted);
}
.footer__top{
  display:grid;
  gap:clamp(30px,4vw,44px);
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(44px,6vw,76px) var(--gutter) 0;
}
.footer__brand{
  display:grid;
  gap:8px;
  padding-bottom:26px;
  border-bottom:1px solid var(--line-soft);
}
.footer__mark{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  color:var(--gold);
}
.footer__name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(24px,3vw,34px);
  letter-spacing:.05em;
  color:var(--paper);
}
.footer__slogan{
  font-family:var(--font-display);
  font-size:clamp(18px,2.2vw,24px);
  letter-spacing:.04em;
  color:var(--paper);
}
.footer__cols{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(24px,3vw,36px);
}
.footer__col-title{
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:400;
  letter-spacing:.2em;
  color:var(--gold);
}
.footer__links{display:grid;gap:11px;}
.footer__link{
  font-size:15px;
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.footer__link:hover{color:var(--gold-lift);border-bottom-color:var(--gold);}
.footer__lines{display:grid;gap:10px;font-size:14px;line-height:1.7;}
.footer__line{margin:0;}
.footer__line--mono{
  font-family:var(--font-mono);
  letter-spacing:.04em;
  color:var(--paper);
}
.footer__copy-block{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px;
  margin-top:18px;
}
.footer__copy-status{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:8px 22px;
  max-width:var(--wrap);
  margin:clamp(30px,4vw,44px) auto 0;
  padding:22px var(--gutter);
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
}
.footer__legal,
.footer__contact{margin:0;color:var(--muted);}

/* 8 图片容器 -------------------------------------------------------------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16/9;
  overflow:hidden;
  border:1px solid var(--line);
  background-color:var(--ink-2);
  background-image:
    repeating-linear-gradient(90deg,rgba(36,64,95,.55) 0 1px,transparent 1px 48px),
    repeating-linear-gradient(0deg,rgba(36,64,95,.45) 0 1px,transparent 1px 48px),
    linear-gradient(140deg,rgba(11,27,51,.95),rgba(22,48,79,.85));
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(circle at 72% 26%,rgba(201,162,39,.3),transparent 46%);
}
.media-frame__inner{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame__caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame--square{aspect-ratio:1/1;}

/* 9 动效与响应式 ---------------------------------------------------------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
}
.js [data-reveal].is-visible{opacity:1;transform:none;}

[data-section]{scroll-margin-top:132px;}
[data-section][data-inview] .sec-num{color:var(--gold-lift);}

@media (max-width:1100px){
  .footer__cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:30px 36px;}
}

@media (max-width:900px){
  .masthead{
    grid-template-columns:minmax(0,1fr) auto;
    justify-items:stretch;
    align-items:center;
    gap:0 14px;
    padding:12px var(--gutter) 14px;
  }
  .brand{justify-items:start;gap:4px;}
  .brand__name{font-size:26px;}
  .brand__sub{display:none;}
  .nav-toggle{display:inline-flex;justify-self:end;}

  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    padding:6px var(--gutter) 16px;
    background-color:var(--ink);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
  }
  .site-nav[data-open]{display:block;}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;padding:0;}
  .site-nav__item + .site-nav__item{border-top:1px solid var(--line-soft);}
  .site-nav__link{
    display:block;
    padding:14px 10px;
    font-size:16px;
    border-bottom:0;
    border-left:2px solid transparent;
  }
  .site-nav__link:hover{border-bottom-color:transparent;border-left-color:var(--line);}
  .site-nav__link[aria-current="page"]{
    border-bottom-color:transparent;
    border-left-color:var(--gold);
  }

  .grid--2,.grid--3,.grid--split{grid-template-columns:minmax(0,1fr);}
  .compare{grid-template-columns:minmax(0,1fr);}
  .compare__col + .compare__col{border-left:0;border-top:1px solid var(--line);}
}

@media (max-width:640px){
  .header-rail{height:34px;max-height:34px;gap:10px;font-size:11px;}
  .rail__nav{display:none;}
  .brand__name{font-size:23px;}
  .site-header[data-condensed] .brand__name{font-size:19px;}
  .footer__cols{grid-template-columns:minmax(0,1fr);}
  .footer__bottom{flex-direction:column;}
  .spec-table th,.spec-table td{padding:12px 10px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .js [data-reveal]{opacity:1;transform:none;transition:none;}
  .num-card:hover,.num-card:focus-visible,
  .btn:hover{transform:none;}
  .skip-link{transition:none;}
  .skip-link:focus{transform:translate(-50%,0);}
  .num-card,
  .btn,
  .site-nav__link,
  .footer__link,
  .rail__link,
  .brand__name,
  .sec-num{transition-property:color,background-color,border-color,filter;}
}