/* ==========================================================================
   九1官网中心 · 中文专区
   共享样式 /assets/site.css —— reset、变量、中文排版、页头、页脚、基础组件
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --ink-navy:#0E1E2D;
  --ink-navy-deep:#0A1622;
  --paper:#F3EBDD;
  --paper-white:#FBF7F0;
  --ink:#15191D;
  --copper:#B7843B;
  --copper-light:#E4CE9E;
  --cinnabar:#B23A2A;
  --cinnabar-deep:#9C3122;
  --celadon:#5E8C7E;
  --celadon-ink:#3D6257;
  --mist:#A9B7BE;
  --deep-teal:#2F4F4A;

  --line-soft:rgba(21,25,29,.12);
  --line-strong:rgba(21,25,29,.26);
  --line-on-dark:rgba(228,206,158,.26);
  --line-on-dark-soft:rgba(169,183,190,.16);

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",SFMono-Regular,Consolas,monospace;

  --measure:34em;
  --radius:3px;
  --pad-edge:clamp(1.15rem,4vw,2.5rem);
  --shadow-plate:0 1px 0 rgba(21,25,29,.06), 0 18px 34px -28px rgba(21,25,29,.55);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
body{
  margin:0;
  background-color:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{max-width:100%;height:auto;}
a{color:inherit;}
button{font:inherit;color:inherit;}
ul,ol{margin:0;padding:0;}
hr{border:0;}

/* ---------- 3. 中文排版 ---------- */
h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.24;
  letter-spacing:.012em;
  color:var(--ink);
}
h1{font-size:clamp(1.9rem,4.2vw,3.1rem);line-height:1.18;}
h2{font-size:clamp(1.45rem,2.8vw,2rem);}
h3{font-size:clamp(1.14rem,1.9vw,1.42rem);}
h4{font-size:1.02rem;letter-spacing:.03em;}
p{margin:0 0 1.05em;}
p:last-child{margin-bottom:0;}
.lede{
  font-size:clamp(1.02rem,1.4vw,1.14rem);
  line-height:1.82;
  color:#3B434A;
  max-width:var(--measure);
}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}
.prose{max-width:var(--measure);font-size:1rem;line-height:1.85;}
.prose h2,.prose h3{margin-top:1.9em;margin-bottom:.65em;}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.3em;}
.prose li{margin-bottom:.45em;}
.prose strong{font-weight:700;}
.rule{
  height:1px;
  background:var(--line-soft);
  border:0;
  margin:clamp(1.6rem,4vw,2.8rem) 0;
}
.sr-only{
  position:absolute;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}
.skip-link{
  position:fixed;
  top:.5rem;left:.5rem;
  z-index:200;
  transform:translateY(-160%);
  padding:.7rem 1.1rem;
  background:var(--paper-white);
  color:var(--ink);
  border:1px solid var(--copper);
  border-radius:var(--radius);
  font-size:.9rem;
  text-decoration:none;
  transition:transform .18s ease;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);}

/* ---------- 4. 焦点可见 ---------- */
:where(a,button,[tabindex]):focus-visible{
  outline:2px solid var(--copper);
  outline-offset:3px;
  border-radius:1px;
}
.site-header :where(a,button):focus-visible,
.site-footer :where(a,button):focus-visible{
  outline-color:var(--copper-light);
}

/* ---------- 5. 布局容器 ---------- */
.container{
  width:100%;
  max-width:1180px;
  margin-inline:auto;
  padding-inline:var(--pad-edge);
}
.section{
  padding-block:clamp(2.4rem,5.5vw,4.6rem);
}
.section--paper{background:var(--paper);}
.section--white{background:var(--paper-white);}
.section--ink{background:var(--ink-navy);color:var(--paper-white);}
.section--ink h1,.section--ink h2,.section--ink h3{color:var(--paper-white);}
.section--ink .lede{color:rgba(251,247,240,.78);}

/* ---------- 6. 页头 ---------- */
.site-header{
  position:relative;
  z-index:60;
  background-color:var(--ink-navy);
  background-image:linear-gradient(180deg,rgba(183,132,59,.10),rgba(183,132,59,0) 42%);
  color:var(--paper-white);
  border-bottom:1px solid rgba(183,132,59,.42);
}
.header-utility{
  background:var(--ink-navy-deep);
  border-bottom:1px solid var(--line-on-dark-soft);
}
.header-utility-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:.75rem 1.25rem;
  flex-wrap:wrap;
  min-height:44px;
  padding-block:.35rem;
  font-size:.8rem;
  color:rgba(251,247,240,.72);
}
.utility-meta{
  display:flex;
  align-items:center;
  gap:.55rem;
  margin:0;
  font-size:.78rem;
  letter-spacing:.04em;
}
.utility-dot{
  width:6px;height:6px;
  flex:none;
  border-radius:50%;
  background:var(--celadon);
  box-shadow:0 0 0 3px rgba(94,140,126,.22);
}
.utility-link{
  color:var(--copper-light);
  text-decoration:none;
  font-size:.8rem;
  letter-spacing:.05em;
  border-bottom:1px solid rgba(228,206,158,.42);
  padding-bottom:1px;
  transition:color .18s ease,border-color .18s ease;
}
.utility-link:hover{
  color:#fff;
  border-bottom-color:var(--copper-light);
}
.masthead{
  border-bottom:1px solid var(--line-on-dark);
}
.masthead-inner{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:1rem;
  min-height:88px;
  padding-block:.95rem;
}
.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.28rem;
  text-decoration:none;
  color:var(--paper-white);
}
.brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.35rem,2.6vw,1.9rem);
  letter-spacing:.09em;
  line-height:1.1;
  padding-inline:.2em;
}
.brand-edition{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--copper-light);
}
.brand:hover .brand-name{color:var(--copper-light);}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.5rem .8rem;
  background:transparent;
  border:1px solid rgba(228,206,158,.45);
  border-radius:var(--radius);
  color:var(--paper-white);
  font-size:.8rem;
  letter-spacing:.1em;
  cursor:pointer;
  transition:background-color .18s ease,border-color .18s ease;
}
.nav-toggle:hover{background:rgba(228,206,158,.12);}
.nav-toggle[aria-expanded="true"]{
  background:var(--cinnabar);
  border-color:var(--cinnabar);
  color:var(--paper-white);
}
.nav-toggle-bars{
  display:block;
  width:15px;height:2px;
  background:currentColor;
  box-shadow:0 -5px 0 currentColor,0 5px 0 currentColor;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{
  box-shadow:0 -5px 0 currentColor,0 5px 0 currentColor;
  opacity:.7;
}
.nav-toggle-text{white-space:nowrap;}

.primary-nav{display:block;}
.nav-inner{display:flex;justify-content:center;}
.nav-list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:stretch;
  gap:.1rem;
  list-style:none;
  margin:0;
  padding:.2rem 0;
}
.nav-link{
  position:relative;
  display:block;
  padding:.72rem .92rem;
  font-size:.92rem;
  letter-spacing:.05em;
  color:rgba(251,247,240,.82);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .18s ease,background-color .18s ease,border-color .18s ease;
}
.nav-link:hover{
  color:#fff;
  background:rgba(228,206,158,.09);
}
.nav-link[aria-current="page"]{
  color:#fff;
  border-bottom-color:var(--cinnabar);
  background:rgba(228,206,158,.06);
}

.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:3px;
  background:rgba(14,30,45,.16);
  z-index:120;
  pointer-events:none;
}
.scroll-progress-bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--copper),var(--copper-light) 65%,#D9B772);
  transform-origin:left center;
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  background-color:var(--ink-navy);
  background-image:linear-gradient(180deg,rgba(183,132,59,.09),rgba(183,132,59,0) 34%);
  color:rgba(251,247,240,.8);
  border-top:1px solid rgba(183,132,59,.4);
}
.footer-anchor{
  background:var(--ink-navy-deep);
  border-bottom:1px solid var(--line-on-dark-soft);
}
.footer-anchor-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:.9rem 1.5rem;
  flex-wrap:wrap;
  padding-block:.95rem;
}
.footer-version{
  display:flex;
  align-items:baseline;
  gap:.7rem;
  flex-wrap:wrap;
  margin:0;
}
.footer-version .mono{
  font-size:1.05rem;
  color:var(--copper-light);
  letter-spacing:.1em;
}
.footer-version-note{
  font-size:.78rem;
  color:rgba(251,247,240,.62);
  letter-spacing:.06em;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.7fr;
  gap:1.75rem 2.25rem;
  padding-block:clamp(1.9rem,4vw,2.9rem);
  border-bottom:1px solid var(--line-on-dark-soft);
}
.footer-col{min-width:0;}
.footer-brand{
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.25rem;
  letter-spacing:.08em;
  color:var(--paper-white);
  margin:0 0 .35rem;
}
.footer-line{
  margin:0 0 .5rem;
  font-size:.84rem;
  line-height:1.72;
  color:rgba(251,247,240,.74);
}
.footer-line--muted{
  color:rgba(251,247,240,.5);
  font-size:.78rem;
  max-width:26em;
}
.footer-heading{
  margin:0 0 .85rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.2em;
  color:var(--copper);
  text-transform:uppercase;
}
.footer-links{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:.52rem;
}
.footer-links a{
  display:inline-block;
  font-size:.9rem;
  color:rgba(251,247,240,.8);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-links a:hover{
  color:var(--copper-light);
  border-bottom-color:rgba(228,206,158,.6);
}
.footer-contact{
  list-style:none;
  margin:0 0 .9rem;
  padding:0;
  display:grid;
  gap:.7rem;
}
.footer-contact-item{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:baseline;
  gap:.4rem .6rem;
}
.footer-contact-item--block{
  grid-template-columns:auto minmax(0,1fr);
}
.footer-contact-label{
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--mist);
  white-space:nowrap;
}
.footer-contact-value{
  font-size:.84rem;
  color:var(--paper-white);
  word-break:break-all;
  line-height:1.5;
}
.footer-legal{
  background:rgba(10,22,34,.62);
}
.footer-legal-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.35rem 1.5rem;
  padding-block:1rem;
  font-size:.76rem;
  letter-spacing:.05em;
  color:rgba(251,247,240,.52);
}
.footer-legal-item{margin:0;}
.footer-legal-note{
  font-family:var(--font-mono);
  color:rgba(251,247,240,.66);
}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  padding:.78rem 1.35rem;
  border:1px solid transparent;
  border-radius:var(--radius);
  background:transparent;
  font-family:var(--font-body);
  font-size:.92rem;
  font-weight:600;
  letter-spacing:.05em;
  line-height:1.3;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn--primary{
  background:var(--cinnabar);
  border-color:var(--cinnabar);
  color:var(--paper-white);
}
.btn--primary:hover{
  background:var(--cinnabar-deep);
  border-color:var(--cinnabar-deep);
}
.btn--ghost{
  background:transparent;
  border-color:rgba(183,132,59,.6);
  color:var(--copper-light);
}
.btn--ghost:hover{
  background:rgba(183,132,59,.18);
  border-color:var(--copper);
  color:#fff;
}
.btn--ink{
  background:var(--ink-navy);
  border-color:var(--ink-navy);
  color:var(--paper-white);
}
.btn--ink:hover{background:var(--deep-teal);border-color:var(--deep-teal);}
.btn--sm{
  padding:.48rem .9rem;
  font-size:.82rem;
}
.copy-btn{
  padding:.16rem .48rem;
  border:1px solid rgba(183,132,59,.55);
  border-radius:2px;
  background:transparent;
  color:var(--copper-light);
  font-family:var(--font-body);
  font-size:.7rem;
  letter-spacing:.1em;
  line-height:1.5;
  cursor:pointer;
  white-space:nowrap;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.copy-btn:hover{
  background:rgba(183,132,59,.22);
  color:#fff;
}
.copy-btn--inline{margin-left:.15rem;}
.copy-btn[data-copied="true"]{
  border-color:var(--celadon);
  color:#A8CBBF;
  background:rgba(94,140,126,.2);
}

/* ---------- 9. 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.4rem;
  padding-block:.9rem;
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.06em;
  color:#6C767D;
}
.crumbs a{
  text-decoration:none;
  color:inherit;
  border-bottom:1px solid rgba(183,132,59,.55);
  transition:color .18s ease,border-color .18s ease;
}
.crumbs a:hover{color:var(--copper);border-bottom-color:var(--copper);}
.crumb-sep{color:var(--copper);opacity:.85;}
.crumb-current{color:var(--ink);font-weight:600;}
.crumbs--on-dark{color:rgba(251,247,240,.6);}
.crumbs--on-dark .crumb-current{color:var(--paper-white);}
.crumbs--on-dark a:hover{color:var(--copper-light);}

/* ---------- 10. 标签与展签 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--copper);
  margin:0 0 .75rem;
}
.eyebrow::before{
  content:"";
  width:1.5rem;
  height:1px;
  background:currentColor;
  opacity:.8;
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:.32rem;
  padding:.2rem .55rem;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  line-height:1.6;
  white-space:nowrap;
}
.tag--copper{
  background:var(--copper-light);
  border-color:rgba(183,132,59,.5);
  color:#3B2A10;
}
.tag--celadon{
  background:rgba(94,140,126,.16);
  border-color:rgba(94,140,126,.45);
  color:var(--celadon-ink);
}
.tag--cinnabar{
  background:var(--cinnabar);
  border-color:var(--cinnabar);
  color:var(--paper-white);
}
.tag--outline{
  background:transparent;
  border-color:rgba(169,183,190,.55);
  color:#5A666D;
}

/* ---------- 11. 面板与网格 ---------- */
.panel{
  background:var(--paper-white);
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  box-shadow:var(--shadow-plate);
}
.panel--pad{padding:clamp(1.3rem,3vw,2.3rem);}
.panel--dark{
  background:var(--ink-navy);
  border-color:rgba(183,132,59,.32);
  color:var(--paper-white);
}
.panel--dark h2,.panel--dark h3{color:var(--paper-white);}
.panel--dark p{color:rgba(251,247,240,.78);}

.stack{display:grid;gap:clamp(.9rem,2.2vw,1.6rem);}
.grid{
  display:grid;
  gap:clamp(.95rem,2.2vw,1.6rem);
}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--split{grid-template-columns:minmax(0,1fr) minmax(0,1.65fr);}

/* ---------- 12. 记录时间轴 ---------- */
.timeline{
  position:relative;
  list-style:none;
  margin:0;
  padding:0;
}
.timeline::before{
  content:"";
  position:absolute;
  left:.42rem;
  top:.45rem;
  bottom:.45rem;
  width:1px;
  background:linear-gradient(180deg,var(--copper),rgba(183,132,59,.14));
}
.timeline-item{
  position:relative;
  padding-left:2rem;
  padding-bottom:1.4rem;
}
.timeline-item:last-child{padding-bottom:0;}
.timeline-item::before{
  content:"";
  position:absolute;
  left:0;
  top:.45rem;
  width:.85rem;
  height:.85rem;
  border:1px solid var(--copper);
  border-radius:50%;
  background:var(--paper-white);
}
.timeline-item--now::before{
  background:var(--cinnabar);
  border-color:var(--cinnabar);
}

/* ---------- 13. 分段切换器基础 ---------- */
.segmented{
  display:inline-flex;
  flex-wrap:wrap;
  gap:2px;
  padding:2px;
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  background:var(--paper-white);
}
.segmented-btn{
  padding:.42rem .85rem;
  border:0;
  border-radius:2px;
  background:transparent;
  color:#5A666D;
  font-family:var(--font-body);
  font-size:.84rem;
  letter-spacing:.05em;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease;
}
.segmented-btn:hover{color:var(--ink);background:rgba(183,132,59,.12);}
.segmented-btn[aria-selected="true"]{
  background:var(--cinnabar);
  color:var(--paper-white);
}

/* ---------- 14. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  background:
    repeating-linear-gradient(135deg,rgba(21,25,29,.05) 0 1px,transparent 1px 9px),
    linear-gradient(160deg,#EFE4D2,#E2D6C2);
}
.media-frame img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--16x9{aspect-ratio:16/9;}
.media-frame--4x3{aspect-ratio:4/3;}
.media-frame--1x1{aspect-ratio:1/1;}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame--dark{
  border-color:rgba(183,132,59,.34);
  background:
    repeating-linear-gradient(135deg,rgba(228,206,158,.07) 0 1px,transparent 1px 10px),
    linear-gradient(160deg,#13293C,#0A1622);
}
.media-caption{
  margin:.55rem 0 0;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.05em;
  line-height:1.6;
  color:#68727A;
}

/* ---------- 15. 响应式 ---------- */
@media (max-width:1024px){
  .footer-grid{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:1.6rem 2rem;
  }
  .footer-col--brand{grid-column:1 / -1;}
}

@media (max-width:860px){
  .masthead-inner{
    justify-content:space-between;
    min-height:74px;
    gap:.75rem;
  }
  .brand{align-items:flex-start;}
  .brand-edition{letter-spacing:.12em;font-size:.66rem;}
  .nav-toggle{display:inline-flex;}

  .primary-nav{
    display:none;
    background:var(--ink-navy-deep);
    border-top:1px solid var(--line-on-dark);
  }
  .primary-nav[data-open="true"]{
    display:block;
    animation:navDrop .2s ease-out both;
  }
  .nav-inner{
    display:block;
    padding-inline:0;
  }
  .nav-list{
    display:block;
    padding:0;
  }
  .nav-list li + li{border-top:1px solid var(--line-on-dark-soft);}
  .nav-link{
    padding:.95rem var(--pad-edge);
    border-bottom:0;
    border-left:3px solid transparent;
    font-size:.95rem;
  }
  .nav-link:hover{background:rgba(228,206,158,.08);}
  .nav-link[aria-current="page"]{
    border-left-color:var(--cinnabar);
    border-bottom:0;
    background:rgba(178,58,42,.14);
  }

  .grid--2,
  .grid--3,
  .grid--split{grid-template-columns:minmax(0,1fr);}
}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-6px);}
  to{opacity:1;transform:translateY(0);}
}

@media (max-width:640px){
  .header-utility-inner{
    min-height:0;
    padding-block:.5rem;
    font-size:.76rem;
  }
  .utility-meta{
    width:100%;
    justify-content:flex-start;
    flex-wrap:wrap;
    gap:.4rem;
  }
  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-contact-item{grid-template-columns:minmax(0,1fr) auto;}
  .footer-contact-label{grid-column:1 / -1;}
  .footer-legal-inner{flex-direction:column;align-items:flex-start;}
  .footer-anchor-inner{flex-direction:column;align-items:flex-start;gap:.7rem;}
}

/* ---------- 16. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .primary-nav[data-open="true"]{animation:none;}
}