/* ==========================================================================
   6676网页 · 共享样式表  /assets/site.css
   深墨蓝控制面板 · 索引轨道 · 框景与细边界
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --deep-ink-900:#0B1622;
  --deep-ink-800:#122233;
  --ink-700:#1C3148;
  --signal-orange:#FF7A1A;
  --terminal-green:#2EE6A8;
  --warm-beige:#E9E1D6;
  --grey-mist:#9FB0C0;
  --paper:#F7F3EC;
  --focus-ring:#FFB37A;

  --line-soft:1px solid rgba(28,49,72,.85);
  --line-strong:1px solid var(--ink-700);
  --line-accent:1px solid rgba(255,122,26,.5);
  --line-green:1px solid rgba(46,230,168,.4);

  --font-head:'Inter Tight','Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'IBM Plex Mono','SFMono-Regular',ui-monospace,'Courier New',monospace;

  --shell:1280px;
  --narrow:820px;
  --gutter:clamp(18px,4vw,52px);
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:130px}
body{
  margin:0;
  background:var(--deep-ink-900);
  color:var(--warm-beige);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0}
table{border-collapse:collapse}
:focus-visible{outline:2px solid var(--focus-ring);outline-offset:3px}

/* ---------- 3. 排版 ---------- */
h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--paper);
  text-wrap:balance;
}
h1{font-size:clamp(34px,5vw,64px)}
h2{font-size:clamp(24px,3.2vw,40px)}
h3{font-size:clamp(19px,2.2vw,26px)}
h4{font-size:clamp(16px,1.6vw,19px)}
strong{color:var(--paper);font-weight:700}
.mono{font-family:var(--font-mono);letter-spacing:.06em}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 4. 布局工具 ---------- */
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}
.shell-narrow{max-width:var(--narrow)}
.section{padding:clamp(44px,6.5vw,92px) 0;border-top:var(--line-soft)}
.section--plain{border-top:0}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid-12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

.section-head{display:grid;gap:12px;margin:0 0 clamp(22px,3vw,36px)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;margin:0;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--terminal-green);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--terminal-green);flex:none}
.section-title{color:var(--paper)}
.lede{max-width:66ch;font-size:clamp(15.5px,1.6vw,17.5px);color:var(--grey-mist)}

.chapter{
  display:grid;
  grid-template-columns:minmax(72px,120px) minmax(0,1fr);
  gap:clamp(16px,3vw,44px);
  padding:clamp(26px,4vw,56px) 0;
  border-top:var(--line-soft);
}
.chapter-num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(38px,6vw,84px);
  line-height:1;
  letter-spacing:-.04em;
  color:transparent;
  -webkit-text-stroke:1px rgba(159,176,192,.55);
}

.prose{max-width:70ch;font-size:17px;line-height:1.8;color:rgba(233,225,214,.88)}
.prose > * + *{margin-top:1.05em}
.prose h2,.prose h3{margin-top:1.9em;color:var(--paper)}
.prose ul,.prose ol{padding-left:1.3em;list-style:disc}
.prose li + li{margin-top:.4em}
.prose a{color:var(--terminal-green);border-bottom:1px solid rgba(46,230,168,.5)}
.prose a:hover{color:var(--focus-ring);border-bottom-color:var(--focus-ring)}
.prose code{font-family:var(--font-mono);font-size:.92em;color:var(--signal-orange)}

/* ---------- 5. 头部命令栏 ---------- */
.skip-link{
  position:absolute;left:var(--gutter);top:8px;z-index:200;
  transform:translateY(-240%);
  background:var(--signal-orange);color:var(--deep-ink-900);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  padding:10px 16px;border-radius:var(--radius);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.site-header{
  position:sticky;top:0;z-index:120;
  background:rgba(11,22,34,.95);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:var(--line-strong);
}
.header-progress{height:2px;background:rgba(28,49,72,.7);overflow:hidden}
.header-progress-fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--terminal-green),var(--signal-orange));
}

.header-main{
  display:grid;grid-template-columns:minmax(0,1fr) auto;
  align-items:center;gap:16px;
  padding:12px 0;
  border-bottom:var(--line-soft);
}
.brand{display:inline-flex;align-items:center;gap:14px;min-width:0}
.brand-mark{
  flex:none;
  font-family:var(--font-mono);font-size:15px;font-weight:600;letter-spacing:.14em;
  color:var(--deep-ink-900);background:var(--terminal-green);
  padding:6px 10px;border-radius:var(--radius);
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{
  font-family:var(--font-head);font-weight:800;font-size:18px;
  letter-spacing:.02em;color:var(--paper);line-height:1.3;
}
.brand-version{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--grey-mist);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.brand:hover .brand-name{color:var(--signal-orange)}

.header-tools{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:10px}
.status-chip{
  display:inline-flex;align-items:center;gap:8px;margin:0;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--terminal-green);
  border:var(--line-green);background:rgba(46,230,168,.06);
  padding:5px 10px;border-radius:var(--radius);white-space:nowrap;
}
.status-dot{
  width:7px;height:7px;border-radius:50%;background:var(--terminal-green);flex:none;
  box-shadow:0 0 0 3px rgba(46,230,168,.16);
}
.header-cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 16px;border-radius:var(--radius);
  background:var(--signal-orange);border:1px solid var(--signal-orange);
  color:var(--deep-ink-900);font-size:13.5px;font-weight:700;letter-spacing:.04em;
  white-space:nowrap;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.header-cta:hover{background:var(--focus-ring);border-color:var(--focus-ring)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:8px 12px;border-radius:var(--radius);
  background:transparent;border:1px solid var(--ink-700);
  color:var(--warm-beige);cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--terminal-green);color:var(--terminal-green)}
.nav-toggle-label{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em}
.nav-toggle-icon{position:relative;display:inline-block;width:16px;height:10px}
.nav-toggle-icon::before,.nav-toggle-icon::after{
  content:"";position:absolute;left:0;width:100%;height:1.5px;background:currentColor;
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle-icon::before{top:0}
.nav-toggle-icon::after{top:8px}
.nav-toggle[data-open] .nav-toggle-icon::before{top:4px;transform:rotate(45deg)}
.nav-toggle[data-open] .nav-toggle-icon::after{top:4px;transform:rotate(-45deg)}

.site-nav{
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:6px 24px;
  border-top:var(--line-soft);
}
.nav-list{display:flex;flex-wrap:wrap;align-items:stretch}
.nav-item{border-right:var(--line-soft)}
.nav-item:first-child{border-left:var(--line-soft)}
.nav-link{
  display:inline-flex;align-items:baseline;gap:8px;
  padding:11px 18px;
  font-size:13.5px;letter-spacing:.02em;color:var(--grey-mist);
  border-bottom:2px solid transparent;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(28,49,72,.55);border-bottom-color:rgba(255,122,26,.6)}
.nav-link[aria-current="page"]{
  color:var(--signal-orange);
  background:rgba(255,122,26,.08);
  border-bottom-color:var(--signal-orange);
}
.nav-index{font-family:var(--font-mono);font-size:11px;color:rgba(159,176,192,.7)}
.nav-link[aria-current="page"] .nav-index{color:var(--signal-orange)}
.nav-note{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:rgba(159,176,192,.75);padding:6px 0;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  margin-top:clamp(56px,8vw,120px);
  background:var(--deep-ink-800);
  border-top:var(--line-strong);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.4fr;
  gap:clamp(24px,3vw,44px);
  padding:clamp(36px,5vw,68px) 0 clamp(22px,3vw,36px);
}
.footer-col{min-width:0}
.footer-col-title{
  margin:0 0 14px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.14em;text-transform:uppercase;color:var(--terminal-green);
}
.footer-brand{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;
  margin:0 0 12px;
  font-family:var(--font-head);font-weight:800;font-size:22px;
  letter-spacing:-.01em;color:var(--paper);
}
.footer-brand-mark{
  font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.1em;
  color:var(--signal-orange);
  border:var(--line-accent);
  padding:3px 8px;border-radius:var(--radius);
}
.footer-brand-note{max-width:40ch;font-size:14px;line-height:1.7;color:var(--grey-mist)}
.footer-list{display:grid;gap:8px}
.footer-link{
  font-size:14px;color:var(--grey-mist);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-link:hover{color:var(--paper);border-bottom-color:var(--signal-orange)}
.footer-contact-list{display:grid;gap:12px}
.footer-contact-item{display:grid;gap:2px}
.footer-contact-label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  color:rgba(159,176,192,.7);
}
.footer-contact-value{font-size:14px;color:var(--warm-beige);word-break:break-word}
.footer-mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;color:var(--paper)}
.footer-meta{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  padding:18px 0 26px;
  border-top:var(--line-soft);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:rgba(159,176,192,.85);
}
.footer-meta-item{margin:0}
.footer-copy{color:rgba(233,225,214,.8)}
.footer-icp{color:var(--grey-mist)}
.footer-region{color:var(--terminal-green)}

/* ---------- 7. 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--radius);border:1px solid transparent;
  font-family:var(--font-body);font-size:15px;font-weight:600;letter-spacing:.02em;
  cursor:pointer;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.btn-primary{background:var(--signal-orange);color:var(--deep-ink-900)}
.btn-primary:hover{background:var(--focus-ring)}
.btn-ghost{background:transparent;border-color:var(--ink-700);color:var(--warm-beige)}
.btn-ghost:hover{border-color:var(--terminal-green);color:var(--terminal-green)}
.btn-mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em}

.breadcrumb{margin:0 0 clamp(18px,2.4vw,28px)}
.breadcrumb-list{
  display:flex;flex-wrap:wrap;gap:0;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
}
.breadcrumb-item{display:inline-flex;align-items:center}
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";margin:0 10px;color:rgba(28,49,72,1);
}
.breadcrumb-link{color:var(--grey-mist)}
.breadcrumb-link:hover{color:var(--signal-orange)}
.breadcrumb-current{color:var(--terminal-green)}

.panel{
  background:var(--deep-ink-800);
  border:var(--line-soft);
  border-radius:var(--radius);
  padding:clamp(18px,2.6vw,28px);
  box-shadow:0 1px 0 rgba(0,0,0,.35);
}
.panel-head{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:10px;padding-bottom:12px;margin-bottom:14px;
  border-bottom:var(--line-soft);
}
.panel-title{margin:0;font-size:19px;font-weight:700;color:var(--paper)}
.panel-meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--terminal-green)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  padding:4px 9px;border:var(--line-soft);border-radius:var(--radius);
  color:var(--grey-mist);
}
.tag-orange{color:var(--signal-orange);border-color:rgba(255,122,26,.5);background:rgba(255,122,26,.08)}
.tag-green{color:var(--terminal-green);border-color:rgba(46,230,168,.45);background:rgba(46,230,168,.07)}

.table-wrap{
  overflow-x:auto;
  background:var(--deep-ink-800);
  border:var(--line-soft);border-radius:var(--radius);
}
.data-table{width:100%;min-width:560px;font-size:14.5px}
.data-table th,.data-table td{
  padding:12px 16px;text-align:left;vertical-align:top;
  border-bottom:var(--line-soft);
}
.data-table th{
  font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.12em;
  color:var(--terminal-green);background:rgba(28,49,72,.5);
}
.data-table tbody tr:hover{background:rgba(28,49,72,.35)}
.data-table tbody tr:last-child td{border-bottom:0}

.accordion{border-top:var(--line-soft)}
.accordion-item{border-bottom:var(--line-soft)}
.accordion-trigger{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  width:100%;padding:16px 4px;
  background:none;border:0;cursor:pointer;text-align:left;
  font-size:16px;color:var(--warm-beige);
  transition:color .18s var(--ease);
}
.accordion-trigger:hover{color:var(--signal-orange)}
.accordion-trigger[aria-expanded="true"]{color:var(--paper)}
.accordion-panel{padding:0 4px 18px;font-size:15px;line-height:1.75;color:var(--grey-mist)}
.accordion-panel[hidden]{display:none}

.media-frame{
  position:relative;display:block;overflow:hidden;
  background:var(--deep-ink-800);
  border:var(--line-soft);border-radius:var(--radius);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--16x9{aspect-ratio:16 / 9}
.media-frame--4x5{aspect-ratio:4 / 5}
.media-frame--1x1{aspect-ratio:1 / 1}
.media-placeholder{
  display:grid;place-items:center;width:100%;height:100%;
  background:
    repeating-linear-gradient(135deg,rgba(46,230,168,.07) 0 1px,transparent 1px 12px),
    repeating-linear-gradient(45deg,rgba(255,122,26,.06) 0 1px,transparent 1px 12px),
    var(--deep-ink-800);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:rgba(159,176,192,.7);
}
.media-caption{
  margin-top:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--grey-mist);
}

/* ---------- 8. 显现（页面阶段用 data-reveal） ---------- */
html[data-js="on"] [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
html[data-js="on"] [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 9. 响应式 ---------- */
@media (max-width:1023px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;flex-direction:column;align-items:stretch;
    gap:0;padding-bottom:10px;
  }
  .site-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;width:100%}
  .nav-item{border-right:0;border-left:0;border-bottom:var(--line-soft)}
  .nav-item:first-child{border-left:0}
  .nav-link{width:100%;padding:14px 4px;font-size:15px}
  .nav-note{padding:10px 4px 0;color:rgba(159,176,192,.75)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .chapter{grid-template-columns:minmax(56px,84px) minmax(0,1fr)}
}
@media (max-width:900px){
  .col-3,.col-4,.col-6,.col-8,.col-9,.col-12{grid-column:1 / -1}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
}
@media (max-width:768px){
  html{scroll-padding-top:150px}
  .status-chip{display:none}
  .header-main{padding:10px 0}
  .brand-version{font-size:10.5px}
  .prose{font-size:16px}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-meta{justify-content:flex-start;gap:6px 18px}
  .header-cta{padding:8px 12px;font-size:12.5px}
  .chapter{grid-template-columns:1fr;gap:12px}
  .chapter-num{font-size:44px}
  .data-table{min-width:480px}
}

/* ---------- 10. 动效与无障碍 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html{scroll-behavior:auto}
  .header-progress-fill{transition:none}
  html[data-js="on"] [data-reveal]{opacity:1;transform:none}
}