/* ==========================================================================
   K8指南 · 共享样式表 /assets/site.css
   工业档案 × 精密仪表：深墨蓝基底、信号橙脉冲、青灰归档
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol{margin:0;padding:0}
ul,ol{list-style:none}
img,svg{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit}
hr{border:0}
[hidden]{display:none!important}

/* ---------- 2. Tokens ---------- */
:root{
  --c-ink:#0A1E3C;
  --c-ink-2:#132F4C;
  --c-ink-3:#0E2643;
  --c-accent:#FF6B35;
  --c-slate:#7A8B99;
  --c-mist:#B0C4DE;
  --c-paper:#F5F7FA;
  --c-char:#1E1E1E;
  --c-steel:#2C5F8A;
  --c-amber:#FFA500;
  --c-line:#E0E0E0;

  --line-1:rgba(176,196,222,.16);
  --line-2:rgba(176,196,222,.34);
  --text-1:#F5F7FA;
  --text-2:#C6D3E3;
  --text-3:#7A8B99;
  --ink-soft:#3C4A58;

  --font-sans:'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','Roboto Mono','Courier New',monospace;

  --r-xl:32px;
  --r-lg:24px;
  --r-md:16px;
  --r-sm:10px;
  --r-pill:999px;

  --wrap:1240px;
  --gutter:clamp(16px,4vw,40px);
  --gap:clamp(14px,1.6vw,22px);

  --shadow-1:0 24px 48px -32px rgba(0,0,0,.85);
  --t-fast:.18s ease;
  --t-med:.32s cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. Base ---------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.7;
  color:var(--text-2);
  background-color:var(--c-ink);
  background-image:
    radial-gradient(900px 420px at 50% -180px, rgba(44,95,138,.40), rgba(10,30,60,0) 70%),
    repeating-linear-gradient(0deg, rgba(176,196,222,.04) 0 1px, transparent 1px 64px);
  min-height:100vh;
  overflow-x:hidden;
}
h1,h2,h3,h4{color:var(--text-1);font-weight:700;line-height:1.25;letter-spacing:-.01em}
h1{font-size:clamp(32px,5.2vw,60px);font-weight:800}
h2{font-size:clamp(24px,3.2vw,36px)}
h3{font-size:clamp(19px,2.1vw,24px)}
h4{font-size:clamp(16px,1.6vw,20px)}
p{max-width:76ch}
a{text-decoration:none}
a:hover{color:var(--c-accent)}
::selection{background:var(--c-accent);color:var(--c-ink)}
:focus-visible{outline:2px solid var(--c-amber);outline-offset:3px;border-radius:6px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ---------- 4. Layout ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(40px,6vw,84px)}
.rule{height:1px;width:100%;background:var(--line-1)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;gap:clamp(12px,2vw,28px);
  margin-bottom:clamp(20px,3vw,36px);
}
.section__head h2{flex:1 1 auto}
.section__lead{flex:1 1 300px;color:var(--text-3);font-size:15px;max-width:56ch}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--c-accent);
}
.kicker::before{content:"";width:22px;height:2px;background:currentColor}
.kicker--vertical{
  writing-mode:vertical-rl;text-orientation:mixed;
  letter-spacing:.34em;color:var(--c-slate);
}
.kicker--vertical::before{width:2px;height:22px}

/* ---------- 5. Masthead ---------- */
.skip-link{
  position:fixed;left:16px;top:-80px;z-index:200;
  padding:10px 20px;border-radius:var(--r-pill);
  background:var(--c-accent);color:var(--c-ink);
  font-weight:700;font-size:14px;text-decoration:none;
  transition:top var(--t-fast);
}
.skip-link:focus{top:14px;color:var(--c-ink)}

.masthead{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg, rgba(10,30,60,.98), rgba(10,30,60,.93));
  border-bottom:1px solid var(--line-1);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.scroll-progress{
  position:absolute;left:0;right:0;top:0;height:3px;
  background:rgba(176,196,222,.10);pointer-events:none;z-index:5;
}
.scroll-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--c-accent),var(--c-amber));
  transition:width .12s linear;
}
.masthead__inner{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;gap:16px;
  padding-block:20px 14px;
  transition:padding var(--t-med);
}
.masthead__kicker{
  grid-column:1;justify-self:start;
  font-size:12px;letter-spacing:.22em;color:var(--c-slate);
  white-space:nowrap;
}
.masthead__brand{
  grid-column:2;justify-self:center;
  display:inline-flex;align-items:center;gap:12px;
  color:var(--text-1);text-decoration:none;
}
.masthead__mark{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(18px,2.2vw,24px);line-height:1;
  letter-spacing:-.02em;
  padding:6px 10px;border-radius:10px;
  background:var(--c-accent);color:var(--c-ink);
}
.masthead__name{
  font-size:clamp(24px,3.6vw,38px);
  font-weight:800;letter-spacing:.06em;color:var(--text-1);
}
.masthead__brand:hover .masthead__name{color:var(--c-accent)}
.masthead__seal{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--c-slate);border:1px solid var(--line-2);
  border-radius:var(--r-pill);padding:3px 9px;
  transform:rotate(-6deg);
}
.masthead__side{
  grid-column:3;justify-self:end;
  display:flex;align-items:center;gap:14px;
}
.masthead__meta{
  font-size:13px;letter-spacing:.06em;color:var(--c-slate);white-space:nowrap;
}
.masthead__meta .mono{color:var(--c-accent);font-size:15px;font-weight:700}

/* ---------- 6. Navigation ---------- */
.nav{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;gap:16px;
  padding-block:0 12px;
}
.nav__list{
  grid-column:2;
  display:flex;flex-wrap:wrap;justify-content:center;
  gap:clamp(8px,1.8vw,26px);
}
.nav__item{display:flex}
.nav__link{
  position:relative;display:inline-block;
  padding:8px 2px;
  font-size:15px;font-weight:500;letter-spacing:.04em;
  color:var(--c-mist);text-decoration:none;
  transition:color var(--t-fast);
}
.nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--c-accent);
  transform:scaleX(0);transform-origin:left;
  transition:transform var(--t-med);
}
.nav__link:hover{color:var(--text-1)}
.nav__link:hover::after,
.nav__link:focus-visible::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--text-1);font-weight:700}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav__actions{
  grid-column:3;justify-self:end;
  display:flex;align-items:center;gap:10px;
}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:8px 14px;border-radius:var(--r-pill);
  border:1px solid var(--line-2);
  color:var(--text-1);font-size:13px;font-weight:600;
  transition:border-color var(--t-fast),color var(--t-fast);
}
.nav-toggle:hover{border-color:var(--c-accent);color:var(--c-accent)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars i{
  display:block;height:2px;border-radius:2px;background:currentColor;
  transition:transform var(--t-fast),opacity var(--t-fast);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ---------- 7. Archive rail ---------- */
.rail{
  position:relative;height:26px;overflow:hidden;
  border-top:1px solid var(--line-1);
  transition:height var(--t-med),opacity var(--t-med);
}
.rail__ticks{
  position:absolute;left:0;right:0;bottom:0;height:45%;
  background-image:repeating-linear-gradient(90deg,var(--line-2) 0 1px,transparent 1px 112px),
                   repeating-linear-gradient(90deg,rgba(176,196,222,.20) 0 1px,transparent 1px 28px);
  background-position:0 0,0 0;
  background-repeat:repeat-x,repeat-x;
}
.rail__label{
  position:absolute;left:50%;top:4px;transform:translateX(-50%);
  padding:0 14px;background:var(--c-ink);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  color:var(--c-slate);white-space:nowrap;
}
.masthead[data-scrolled="true"] .rail{height:0;opacity:0;border-top-color:transparent}
.masthead[data-scrolled="true"] .masthead__inner{padding-block:10px 8px}

/* ---------- 8. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:15px;font-weight:600;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  transition:background var(--t-fast),color var(--t-fast),border-color var(--t-fast),transform var(--t-fast);
}
.btn:active{transform:translateY(1px)}
.btn--accent{background:var(--c-accent);color:var(--c-ink);font-weight:700}
.btn--accent:hover{background:var(--c-amber);color:var(--c-ink)}
.btn--ghost{border-color:var(--line-2);color:var(--text-1);background:transparent}
.btn--ghost:hover{border-color:var(--c-accent);color:var(--c-accent)}
.btn--steel{background:var(--c-steel);color:#fff}
.btn--steel:hover{background:#35709F;color:#fff}
.btn--sm{padding:8px 16px;font-size:13px}

/* ---------- 9. Chips & tags ---------- */
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--r-pill);
  border:1px solid var(--line-2);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--c-mist);white-space:nowrap;
}
.chip--accent{border-color:rgba(255,107,53,.5);color:var(--c-accent);background:rgba(255,107,53,.10)}
.chip--slate{border-color:rgba(122,139,153,.5);color:var(--c-slate);background:rgba(122,139,153,.12)}
.chip--steel{border-color:rgba(44,95,138,.7);color:#9EC4E4;background:rgba(44,95,138,.18)}
.chip--amber{border-color:rgba(255,165,0,.5);color:var(--c-amber);background:rgba(255,165,0,.10)}

/* ---------- 10. Bento & cards ---------- */
.bento{
  display:grid;grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.bento>*{grid-column:span 12;min-width:0}
@media (min-width:720px){
  .bento>.col-2{grid-column:span 2}
  .bento>.col-3{grid-column:span 3}
  .bento>.col-4{grid-column:span 4}
  .bento>.col-5{grid-column:span 5}
  .bento>.col-6{grid-column:span 6}
  .bento>.col-7{grid-column:span 7}
  .bento>.col-8{grid-column:span 8}
  .bento>.col-9{grid-column:span 9}
  .bento>.col-10{grid-column:span 10}
  .bento>.col-12{grid-column:span 12}
}
.card{
  display:flex;flex-direction:column;gap:12px;
  padding:clamp(18px,2vw,26px);
  border-radius:var(--r-lg);
  border:1px solid var(--line-1);
  background:linear-gradient(160deg, rgba(19,47,76,.92), rgba(14,38,67,.92));
  box-shadow:var(--shadow-1);
  transition:border-color var(--t-fast),transform var(--t-med);
}
.card:hover{border-color:var(--line-2);transform:translateY(-2px)}
.card--accent{border-color:rgba(255,107,53,.42)}
.card--paper{background:var(--c-paper);color:var(--c-char);border-color:var(--c-line)}
.card--paper h3,.card--paper h4{color:var(--c-char)}
.card__meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.card__title{font-size:clamp(18px,1.8vw,22px)}
.card__body{font-size:15px;color:var(--text-2)}
.card--paper .card__body{color:var(--ink-soft)}
.card__foot{
  margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-top:12px;border-top:1px dashed var(--line-1);
  font-family:var(--font-mono);font-size:13px;color:var(--c-slate);
}
.card--paper .card__foot{border-top-color:var(--c-line)}

/* ---------- 11. Stats ---------- */
.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(28px,4vw,44px);line-height:1.1;
  letter-spacing:-.02em;color:var(--text-1);
}
.stat__value--accent{color:var(--c-accent)}
.stat__unit{font-size:.5em;color:var(--c-slate);margin-left:4px;font-weight:500}
.stat__label{font-size:13px;letter-spacing:.1em;color:var(--c-slate)}

/* ---------- 12. Panels ---------- */
.panel{
  padding:clamp(20px,3vw,40px);
  border-radius:var(--r-xl);
  border:1px solid var(--line-1);
  background:rgba(19,47,76,.55);
}
.panel--paper{background:var(--c-paper);color:var(--c-char);border-color:var(--c-line)}
.panel--paper h2,.panel--paper h3,.panel--paper h4{color:var(--c-char)}
.panel--paper p{color:var(--ink-soft)}

/* ---------- 13. Figures ---------- */
.figure{display:flex;flex-direction:column;gap:10px;margin:0}
.figure__frame{
  position:relative;width:100%;aspect-ratio:16/9;
  border-radius:var(--r-md);overflow:hidden;
  border:1px solid var(--line-1);
  background-color:var(--c-ink-2);
  background-image:
    repeating-linear-gradient(135deg, rgba(176,196,222,.07) 0 2px, transparent 2px 12px),
    linear-gradient(140deg, rgba(44,95,138,.35), rgba(10,30,60,.92));
}
.figure__frame>img{width:100%;height:100%;object-fit:cover}
.figure__frame--wide{aspect-ratio:21/9}
.figure__frame--tall{aspect-ratio:4/5}
.figure__frame--square{aspect-ratio:1/1}
.figure__badge{
  position:absolute;left:12px;top:12px;
  padding:3px 10px;border-radius:var(--r-pill);
  background:rgba(10,30,60,.80);border:1px solid var(--line-2);
  font-family:var(--font-mono);font-size:12px;color:var(--c-mist);
}
.figure__caption{font-family:var(--font-mono);font-size:13px;color:var(--c-slate)}

/* ---------- 14. Breadcrumbs & page head ---------- */
.breadcrumbs{padding-block:14px;border-bottom:1px solid var(--line-1)}
.breadcrumbs__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:13px;color:var(--c-slate);
}
.breadcrumbs__list li+li::before{content:"/";margin-right:8px;color:var(--line-2)}
.breadcrumbs a{color:var(--c-mist)}
.breadcrumbs a:hover{color:var(--c-accent)}
.breadcrumbs [aria-current="page"]{color:var(--text-1)}
.page-head{display:grid;gap:14px;padding-block:clamp(28px,5vw,64px)}
.page-head__index{font-family:var(--font-mono);font-size:12px;letter-spacing:.3em;color:var(--c-accent)}
.page-head__note{color:var(--text-3);font-size:15px;max-width:64ch}

/* ---------- 15. Folds ---------- */
.fold{
  border:1px solid var(--line-1);border-radius:var(--r-md);
  background:rgba(19,47,76,.55);overflow:hidden;
}
.fold+.fold{margin-top:10px}
.fold>summary{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:16px 20px;cursor:pointer;list-style:none;
  font-weight:600;color:var(--text-1);
}
.fold>summary::-webkit-details-marker{display:none}
.fold>summary::after{content:"＋";font-family:var(--font-mono);color:var(--c-accent)}
.fold[open]>summary::after{content:"－"}
.fold__body{
  padding:0 20px 20px;border-top:1px solid var(--line-1);
  font-size:15px;line-height:1.8;color:var(--text-2);
}

/* ---------- 16. Filter bar ---------- */
.filterbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.filterbar__btn{
  padding:8px 16px;border-radius:var(--r-pill);
  border:1px solid var(--line-2);background:transparent;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;
  color:var(--c-mist);
  transition:background var(--t-fast),color var(--t-fast),border-color var(--t-fast);
}
.filterbar__btn:hover{border-color:var(--c-accent);color:var(--c-accent)}
.filterbar__btn[aria-pressed="true"]{
  background:var(--c-accent);border-color:transparent;color:var(--c-ink);font-weight:700;
}
.filterbar__status{
  margin-left:auto;font-family:var(--font-mono);font-size:12px;color:var(--c-slate);
}

/* ---------- 17. Footer ---------- */
.footer{
  margin-top:clamp(48px,7vw,110px);
  border-top:1px solid var(--line-2);
  background:linear-gradient(180deg, rgba(19,47,76,.72), rgba(10,30,60,.97));
}
.footer__grid{
  display:grid;grid-template-columns:1fr;gap:clamp(24px,3vw,48px);
  padding-block:clamp(32px,5vw,64px);
}
@media (min-width:720px){ .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))} }
@media (min-width:1024px){
  .footer__grid{grid-template-columns:1.5fr 1fr 1fr 1fr 1.4fr}
}
.footer__col{display:flex;flex-direction:column;gap:14px;min-width:0}
.footer__col--brand{gap:18px}
.footer__brand{
  display:flex;align-items:center;gap:10px;
  font-size:clamp(22px,2.4vw,28px);font-weight:800;color:var(--text-1);
}
.footer__brandmark{
  font-family:var(--font-mono);font-size:.72em;line-height:1;
  padding:5px 9px;border-radius:9px;
  background:var(--c-accent);color:var(--c-ink);
}
.footer__desc{font-size:14px;line-height:1.8;color:var(--text-3);max-width:34ch}
.footer__stamp{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--c-slate);
}
.footer__title{
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--c-mist);
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{
  display:flex;align-items:baseline;justify-content:space-between;gap:12px;
  padding-bottom:7px;border-bottom:1px dotted var(--line-1);
  font-size:14px;color:var(--text-2);
  transition:color var(--t-fast),border-color var(--t-fast);
}
.footer__link:hover{color:var(--c-accent);border-bottom-color:rgba(255,107,53,.5)}
.footer__count{font-family:var(--font-mono);font-size:12px;color:var(--c-slate)}
.footer__contact{display:flex;flex-direction:column;gap:10px;font-size:14px}
.footer__contact-item{display:flex;gap:10px;align-items:baseline;max-width:100%}
.footer__contact-label{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--c-slate);min-width:38px;flex:none;
}
.footer__contact-value{color:var(--text-2);word-break:break-all}
a.footer__contact-value:hover{color:var(--c-accent)}
.footer__note{
  font-size:12px;line-height:1.7;color:var(--c-slate);
  padding-top:10px;border-top:1px dashed var(--line-1);max-width:34ch;
}
.footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 28px;padding-block:20px 34px;
  border-top:1px solid var(--line-1);
  font-size:13px;color:var(--c-slate);
}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer__legal a{color:var(--c-mist);transition:color var(--t-fast)}
.footer__legal a:hover{color:var(--c-accent)}
.footer__icp{font-family:var(--font-mono);letter-spacing:.04em}

/* ---------- 18. Reveal ---------- */
.js-ready .reveal{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .55s cubic-bezier(.22,.61,.36,1)}
.js-ready .reveal.is-visible{opacity:1;transform:none}

/* ---------- 19. Breakpoints ---------- */
@media (max-width:899px){
  .nav-toggle{display:inline-flex}
  .masthead__kicker{display:none}
  .nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;grid-template-columns:minmax(0,1fr);
    max-width:none;gap:6px;
    padding:14px var(--gutter) 18px;
    background:var(--c-ink-2);
    border-bottom:1px solid var(--line-2);
    box-shadow:var(--shadow-1);
  }
  .nav[data-open="true"]{display:grid}
  .nav__list{grid-column:1;flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px dotted var(--line-1)}
  .nav__link{display:block;padding:14px 4px;font-size:16px}
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{color:var(--c-accent)}
  .nav__actions{grid-column:1;justify-self:stretch;padding-top:14px}
  .nav__actions .btn{width:100%}
}
@media (max-width:639px){
  .masthead__meta{display:none}
  .masthead__seal{display:none}
  .rail__label{font-size:10px;letter-spacing:.14em}
  .footer__legal{flex-direction:column;align-items:flex-start}
}
@media (min-width:900px){
  .nav[data-open="false"]{display:grid}
}

/* ---------- 20. Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .js-ready .reveal{opacity:1!important;transform:none!important}
  .card:hover{transform:none}
  .scroll-progress__bar{transition:none}
}