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

:root{
  --ink:#0A1020;
  --ink-2:#16203A;
  --paper:#F6EEDF;
  --paper-2:#EADCC4;
  --text:#241B16;
  --silver:#C7CDD6;
  --ember:#FF5A1F;
  --ember-deep:#C9330A;
  --lime:#B9FF4B;
  --blue:#3B6BFF;
  --violet:#8A5CFF;
  --gold:#E3A33B;

  --line:rgba(199,205,214,.26);
  --line-dark:rgba(36,27,22,.14);
  --frame-w:96px;
  --topbar-h:64px;
  --tabs-h:72px;
  --radius:16px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --read-progress:0;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-body:"Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}

body{
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
@media (min-width:1024px){body{padding-left:var(--frame-w)}}
@media (max-width:1023px){body{padding-top:var(--topbar-h);padding-bottom:calc(var(--tabs-h) + env(safe-area-inset-bottom,0px))}}
@media (max-width:1023px){body[data-nav-locked]{overflow:hidden}}

#main-content{display:block;min-height:60vh;background:var(--paper)}
#main-content:focus{outline:none}

:focus-visible{outline:2px solid var(--lime);outline-offset:3px;box-shadow:0 0 0 5px rgba(10,16,32,.55);border-radius:4px}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.15;letter-spacing:-.015em;color:var(--text)}
p{text-wrap:pretty}

.display{font-family:var(--font-display);font-weight:900;line-height:1.06;letter-spacing:-.02em}
.display--xl{font-size:clamp(2.4rem,5vw,4.6rem)}
.display--md{font-size:clamp(1.5rem,2.6vw,2.2rem)}
.stamp{display:inline-block;transform:skewX(-6deg)}
.type-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}

.wrap{width:100%;max-width:1280px;margin-inline:auto;padding-inline:clamp(20px,4vw,64px)}

.grid12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,28px)}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-6{grid-column:span 6}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}
.offset-1{grid-column-start:2}
@media (max-width:1023px){
  .span-3,.span-4,.span-6,.span-8{grid-column:span 6}
  .offset-1{grid-column-start:auto}
}
@media (max-width:639px){
  .span-3,.span-4,.span-6,.span-8,.span-12{grid-column:span 12}
}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:.55em;padding:.78em 1.35em;border-radius:999px;font-size:.94rem;font-weight:600;line-height:1.2;text-align:center;border:1px solid transparent;transition:transform .18s var(--ease),background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease)}
.btn--ember{background:linear-gradient(120deg,var(--ember),var(--ember-deep));color:#fff;box-shadow:0 10px 24px -16px rgba(255,90,31,.95)}
.btn--ember:hover{transform:translateY(-2px)}
.btn--line{border-color:var(--line-dark);color:var(--text)}
.btn--line:hover{border-color:var(--ember);color:var(--ember-deep)}
.btn--ghost{background:rgba(246,238,223,.08);border-color:var(--line);color:var(--paper)}
.btn--ghost:hover{background:rgba(246,238,223,.16)}

.tag{display:inline-flex;align-items:center;gap:.45em;padding:.28em .72em;border-radius:999px;font-size:.78rem;font-weight:600;letter-spacing:.02em;background:var(--paper-2);color:var(--text);border:1px solid var(--line-dark)}
.tag::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}
.tag--blue{background:#E6ECFF;color:#21419E;border-color:#C3D1F7}
.tag--violet{background:#EEE7FF;color:#5533B8;border-color:#D9CBFB}
.tag--gold{background:#FBEEDA;color:#8A5A11;border-color:#EFD9B2}
.tag--ember{background:#FFE7DC;color:#A62A06;border-color:#F8C7B0}
.tag--lime{background:#EAFBCF;color:#3E5C0B;border-color:#D3F0A6}
.tag--onDark{background:rgba(246,238,223,.1);color:var(--paper);border-color:var(--line)}

.breadcrumb{padding-block:14px;border-bottom:1px solid var(--line-dark)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:.5em;font-size:.82rem;color:rgba(36,27,22,.62)}
.breadcrumb-list li+li::before{content:"/";margin-right:.5em;color:rgba(36,27,22,.32)}
.breadcrumb-list a:hover{color:var(--ember-deep)}

.prose{max-width:44em;font-size:1.0625rem;line-height:1.8;color:var(--text)}
.prose p+p{margin-top:1.05em}

.figure{display:grid;gap:10px}
.figure__media{position:relative;overflow:hidden;border-radius:calc(var(--radius) + 4px);aspect-ratio:16/9;border:1px solid var(--line);background:linear-gradient(135deg,var(--ink-2),var(--ink))}
.figure__media img{width:100%;height:100%;object-fit:cover}
.figure__media--wide{aspect-ratio:21/9}
.figure__media--tall{aspect-ratio:3/4}
.figure__cap{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.02em;color:rgba(36,27,22,.6)}
.figure--dark .figure__cap{color:rgba(246,238,223,.6)}

.panel{background:var(--paper-2);border-radius:var(--radius);padding:clamp(18px,2.4vw,30px)}
.glass{background:rgba(22,32,58,.72);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);color:var(--paper)}

.stat{display:grid;gap:4px}
.stat__num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(1.5rem,3vw,2.4rem);font-weight:600;letter-spacing:-.03em;line-height:1.05;color:var(--ember-deep)}
.stat__key{font-size:.8rem;letter-spacing:.06em;color:rgba(36,27,22,.62)}

.eyebrow{display:inline-flex;align-items:center;gap:.6em;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--ember-deep)}
.eyebrow::before{content:"";width:22px;height:2px;background:currentColor}
.rule{height:1px;border:0;background:var(--line-dark);margin-block:clamp(24px,3vw,40px)}
.note{border-left:2px solid var(--ember);padding-left:14px;font-size:.9rem;line-height:1.7;color:rgba(36,27,22,.75)}

.visually-hidden{position:absolute !important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}

/* ---------- 框架式头部 ---------- */
.site-frame{
  position:fixed;z-index:90;left:0;top:0;width:100%;
  background:rgba(10,16,32,.94);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  color:var(--paper);
  border-bottom:1px solid var(--line);
}
.skip-link{position:fixed;left:8px;top:8px;z-index:200;padding:10px 16px;border-radius:8px;background:var(--paper);color:var(--ink);font-weight:600;font-size:.9rem;transform:translateY(-180%);transition:transform .2s var(--ease)}
.skip-link:focus{transform:translateY(0)}
.frame-progress{position:fixed;left:0;right:0;top:0;height:2px;z-index:99;pointer-events:none;background:rgba(199,205,214,.14)}
.frame-progress [data-progress-bar]{display:block;height:100%;width:100%;transform-origin:left center;transform:scaleX(var(--read-progress));background:linear-gradient(90deg,var(--lime),var(--ember))}

.frame-body{display:flex;align-items:center;gap:12px;height:var(--topbar-h);padding-inline:16px}
@media (max-width:1023px){.frame-body{padding-right:104px}}

.brand-mark{display:flex;align-items:center;gap:10px;color:var(--paper);flex:none}
.brand-glyph{width:34px;height:34px;display:grid;place-items:center;border-radius:9px;background:linear-gradient(135deg,var(--ember),var(--ember-deep));color:#fff;font-family:var(--font-display);font-size:1rem;font-weight:900;box-shadow:inset 0 0 0 1px rgba(255,255,255,.22);flex:none}
.brand-words{display:flex;flex-direction:column;line-height:1.12;min-width:0}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:.95rem;letter-spacing:.01em;white-space:nowrap}
.brand-line{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.24em;color:rgba(246,238,223,.55);white-space:nowrap}
@media (max-width:639px){.brand-line{display:none}}

.frame-nav{
  position:fixed;left:0;right:0;top:var(--topbar-h);z-index:92;
  background:linear-gradient(180deg,var(--ink-2),var(--ink));
  border-bottom:1px solid var(--line);
  padding:16px 16px 22px;
  max-height:calc(100dvh - var(--topbar-h) - var(--tabs-h));
  overflow-y:auto;
  transform:translateY(-10px);opacity:0;visibility:hidden;
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease);
}
.site-frame[data-open] .frame-nav{transform:translateY(0);opacity:1;visibility:visible}
.nav-caption{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.24em;color:rgba(246,238,223,.38);margin-bottom:10px}
.nav-list{display:grid;gap:2px}
.nav-item{min-width:0}
.nav-link{display:flex;align-items:center;gap:10px;padding:12px 10px;border-radius:10px;font-size:1.02rem;font-weight:600;color:rgba(246,238,223,.86);transition:background .18s var(--ease),color .18s var(--ease)}
.nav-link:hover{background:rgba(246,238,223,.08);color:var(--paper)}
.nav-link[aria-current="page"]{background:rgba(255,90,31,.16);color:#FFD9C9}
.nav-tone{--tone:var(--silver);width:8px;height:8px;border-radius:2px;background:var(--tone);transform:rotate(45deg);flex:none;transition:transform .2s var(--ease)}
.nav-tone--blue{--tone:var(--blue)}
.nav-tone--violet{--tone:var(--violet)}
.nav-tone--gold{--tone:var(--gold)}
.nav-tone--ember{--tone:var(--ember)}
.nav-tone--lime{--tone:var(--lime)}
.nav-tone--silver{--tone:var(--silver)}
.nav-link:hover .nav-tone,.nav-link[aria-current="page"] .nav-tone{transform:rotate(45deg) scale(1.35)}

.drawer-cta{display:flex;justify-content:center;margin-top:16px;padding:13px;border-radius:10px;background:linear-gradient(120deg,var(--ember),var(--ember-deep));color:#fff;font-weight:700;font-size:.95rem;box-shadow:0 12px 26px -18px rgba(255,90,31,1)}
.frame-cta{display:none}

.frame-utility{display:flex;align-items:center;gap:8px;margin-left:auto}
.util-btn{width:36px;height:36px;display:grid;place-items:center;border-radius:10px;border:1px solid var(--line);color:var(--paper);font-size:1rem;line-height:1;transition:background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease)}
.util-btn:hover{background:rgba(246,238,223,.1);border-color:rgba(246,238,223,.42)}
.util-btn[aria-pressed="true"]{background:var(--lime);color:var(--ink);border-color:var(--lime)}
.lang-chip{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;padding:4px 8px;border-radius:6px;border:1px solid var(--line);color:rgba(246,238,223,.7)}

.nav-toggle{position:absolute;right:8px;top:0;height:var(--topbar-h);display:flex;align-items:center;gap:8px;padding:0 10px;color:var(--paper);font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em}
.nav-toggle-icon{display:grid;gap:4px}
.nav-toggle-bar{display:block;width:18px;height:2px;background:currentColor;transition:transform .24s var(--ease)}
.site-frame[data-open] .nav-toggle-bar:first-child{transform:translateY(3px) rotate(45deg)}
.site-frame[data-open] .nav-toggle-bar:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-word{color:rgba(246,238,223,.8)}

.search-drawer{position:fixed;left:0;right:0;top:var(--topbar-h);z-index:95;padding:18px 16px 24px;background:rgba(22,32,58,.97);border-bottom:1px solid var(--line);box-shadow:0 36px 70px -46px #000}
.search-inner{max-width:720px;margin-inline:auto;display:grid;gap:12px}
.search-label{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.24em;color:rgba(246,238,223,.55)}
.search-input{width:100%;padding:12px 14px;border-radius:10px;background:rgba(246,238,223,.07);border:1px solid var(--line);color:var(--paper);font-size:1rem}
.search-input::placeholder{color:rgba(246,238,223,.4)}
.search-input:focus{outline:none;border-color:var(--lime);background:rgba(246,238,223,.12);box-shadow:0 0 0 3px rgba(185,255,75,.16)}
.search-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:6px;max-height:46vh;overflow:auto}
.search-link{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;border:1px solid transparent;font-size:.94rem;color:rgba(246,238,223,.86);transition:background .18s var(--ease),border-color .18s var(--ease)}
.search-link:hover{background:rgba(246,238,223,.08);border-color:var(--line)}
.search-link[aria-current="page"]{background:rgba(255,90,31,.16);color:#FFD9C9;border-color:rgba(255,90,31,.36)}
.search-code{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;color:var(--ember)}
.search-empty{font-size:.9rem;color:rgba(246,238,223,.6)}

.quick-tabs{position:fixed;left:0;right:0;bottom:0;z-index:88;background:rgba(10,16,32,.96);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom,0px)}
.quick-tabs-glow{position:absolute;left:0;right:0;top:-1px;height:2px;background:linear-gradient(90deg,var(--blue),var(--violet) 30%,var(--gold) 55%,var(--ember) 78%,var(--lime))}
.quick-list{display:grid;grid-template-columns:repeat(5,1fr)}
.quick-link{display:flex;flex-direction:column;align-items:center;gap:6px;padding:11px 4px 12px;font-size:.72rem;font-weight:600;letter-spacing:.02em;color:rgba(246,238,223,.62);transition:color .18s var(--ease)}
.quick-link:hover,.quick-link[aria-current="page"]{color:var(--paper)}
.quick-tone{--tone:var(--silver);width:16px;height:3px;border-radius:2px;background:var(--tone);transition:background .18s var(--ease),box-shadow .18s var(--ease)}
.quick-link[aria-current="page"] .quick-tone{background:var(--ember);box-shadow:0 0 12px rgba(255,90,31,.85)}

/* ---------- 桌面：竖向框导航 ---------- */
@media (min-width:1024px){
  .site-frame{width:var(--frame-w);height:100dvh;display:flex;flex-direction:column;border-right:1px solid var(--line);border-bottom:0}
  .frame-progress{left:calc(var(--frame-w) - 2px);right:auto;top:0;width:2px;height:100dvh;background:rgba(199,205,214,.12)}
  .frame-progress [data-progress-bar]{width:100%;height:100%;transform-origin:top center;transform:scaleY(var(--read-progress));background:linear-gradient(180deg,var(--lime),var(--ember))}
  .skip-link{left:calc(var(--frame-w) + 10px)}

  .frame-body{flex:1;height:auto;flex-direction:column;align-items:center;gap:0;padding:20px 0 22px}
  .brand-mark{flex-direction:column;gap:10px;text-align:center}
  .brand-words{flex-direction:row;align-items:center;gap:8px}
  .brand-name{writing-mode:vertical-rl;font-size:.72rem;letter-spacing:.18em}
  .brand-line{writing-mode:vertical-rl;font-size:.56rem;letter-spacing:.3em}

  .frame-nav{position:static;visibility:visible;opacity:1;transform:none;background:none;border:0;padding:0;margin-block:auto;width:100%;max-height:none;overflow:visible}
  .nav-caption{display:block;text-align:center;margin-bottom:8px;font-size:.58rem;letter-spacing:.22em}
  .nav-list{gap:4px;padding-inline:6px}
  .nav-link{flex-direction:column;gap:6px;padding:9px 2px;font-size:.74rem;line-height:1.2;text-align:center;letter-spacing:.02em;border-radius:8px}
  .nav-link[aria-current="page"]{box-shadow:inset 0 0 0 1px rgba(255,90,31,.4)}
  .drawer-cta{display:none}

  .frame-utility{flex-direction:column;align-items:center;gap:8px;margin-left:0;width:100%;padding:14px 8px 0;border-top:1px solid var(--line)}
  .lang-chip{display:none}
  .frame-cta{display:flex;align-items:center;justify-content:center;width:100%;padding:12px 4px;border-radius:10px;background:linear-gradient(150deg,var(--ember),var(--ember-deep));color:#fff;font-size:.7rem;font-weight:700;line-height:1.35;letter-spacing:.04em;text-align:center;box-shadow:0 10px 24px -16px rgba(255,90,31,.95);transition:transform .18s var(--ease),filter .18s var(--ease)}
  .frame-cta:hover{transform:translateY(-2px);filter:brightness(1.06)}

  .nav-toggle{display:none}
  .search-drawer{top:0;left:var(--frame-w);right:auto;width:min(560px,58vw);border-left:1px solid var(--line);border-radius:0 0 18px 0;padding:26px 24px 28px}
  .quick-tabs{display:none}
}
@media (min-width:1024px) and (max-height:700px){
  .brand-line{display:none}
  .nav-link{padding:6px 2px}
  .nav-caption{display:none}
}

/* ---------- 页脚 ---------- */
.site-footer{
  background-color:var(--ink);
  background-image:linear-gradient(rgba(199,205,214,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(199,205,214,.055) 1px,transparent 1px);
  background-size:48px 48px;
  background-position:center;
  color:rgba(246,238,223,.78);
  border-top:1px solid var(--line);
  padding-top:clamp(40px,6vw,72px);
  font-size:.92rem;
}
.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr) 1.4fr;gap:clamp(20px,3vw,40px);align-items:start}
@media (max-width:1023px){
  .footer-grid{grid-template-columns:1fr 1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:639px){.footer-grid{grid-template-columns:1fr 1fr}}
.footer-mark{display:inline-block;font-family:var(--font-display);font-weight:900;font-size:1.2rem;color:var(--paper);letter-spacing:.02em}
.footer-line{margin-top:8px;font-size:.86rem;line-height:1.7;color:rgba(246,238,223,.6);max-width:24em}
.footer-mono{margin-top:14px;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.16em;color:rgba(185,255,75,.78)}
.footer-head{font-family:var(--font-mono);font-size:.66rem;font-weight:500;letter-spacing:.22em;text-transform:uppercase;color:rgba(246,238,223,.42);margin-bottom:12px}
.footer-col ul{display:grid;gap:8px}
.footer-col a{font-size:.92rem;color:rgba(246,238,223,.78);transition:color .18s var(--ease)}
.footer-col a:hover{color:var(--paper);text-decoration:underline;text-underline-offset:4px;text-decoration-color:var(--ember)}
.footer-contact p{margin-bottom:8px;line-height:1.7}
.contact-key{display:inline-block;min-width:2.6em;margin-right:6px;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.1em;color:rgba(246,238,223,.4)}
.footer-note{margin-top:10px;font-size:.76rem;line-height:1.65;color:rgba(246,238,223,.45)}
.footer-base{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 28px;margin-top:clamp(32px,4vw,56px);padding-block:20px;border-top:1px solid var(--line);font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;color:rgba(246,238,223,.5)}

@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}
}