/* ==========================================================================
   /assets/site.css — 万博娱乐 共享站点套件
   夜间灯塔轨道 + 复古出版面板
   ========================================================================== */

:root{
  --ink-900:#07152E;
  --ink-850:#0A1D3C;
  --ink-800:#0E2C55;
  --cyan:#35E6E0;
  --mist:#9DF6F1;
  --amber:#F2B84B;
  --paper:#F3E7D3;
  --brown:#1A120D;
  --ember:#D9553F;
  --haze:#9CB0C4;

  --text:#E7EFF9;
  --text-dim:#A9BBD0;
  --line:rgba(157,246,241,.16);
  --line-strong:rgba(157,246,241,.34);

  --rail-w:276px;
  --topbar-h:66px;
  --shell:1200px;
  --gutter:clamp(20px,4vw,64px);

  --font-display:"HarmonyOS Sans SC","Space Grotesk","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Source Han Sans SC","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,Consolas,monospace;

  --radius-xs:6px;
  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:26px;

  --shadow-lift:0 24px 60px -36px rgba(2,9,20,.95);
  --glow-cyan:0 0 28px -8px rgba(53,230,224,.55);
  --ease:cubic-bezier(.22,.8,.24,1);
}

/* ===== 01. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--topbar-h) + 16px)}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0}
a{color:var(--mist);text-decoration:none}
table{border-collapse:collapse;width:100%}

::selection{background:var(--cyan);color:#04101F}

/* ===== 02. 基础排版 ===== */
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--text);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 640px at 84% -10%, rgba(14,44,85,.9), transparent 72%),
    radial-gradient(820px 520px at 6% 108%, rgba(53,230,224,.10), transparent 68%),
    radial-gradient(620px 420px at 52% 46%, rgba(242,184,75,.05), transparent 72%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.16;
  letter-spacing:.01em;
  color:var(--paper);
  margin-bottom:.55em;
}
h1{font-size:clamp(2.4rem,6vw,4.6rem);letter-spacing:-.01em}
h2{font-size:clamp(1.75rem,3vw,3.05rem)}
h3{font-size:clamp(1.24rem,2vw,1.7rem);font-weight:700}
h4{font-size:1.06rem;font-weight:700;letter-spacing:.02em}
p{margin-bottom:1em}
p:last-child{margin-bottom:0}
strong{color:var(--paper);font-weight:700}

:focus-visible{outline:2px solid var(--amber);outline-offset:3px;border-radius:4px}

@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
}
@media (max-width:1023px){
  body{padding-top:var(--topbar-h)}
}

/* ===== 03. 容器与工具类 ===== */
.wrap{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.page-main{display:block;padding-block:clamp(30px,5vw,64px) clamp(48px,7vw,96px)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

.rule{height:1px;border:0;margin:clamp(28px,4vw,52px) 0;background:linear-gradient(90deg,rgba(157,246,241,.42),rgba(157,246,241,.06) 60%,transparent)}

.eyebrow{
  display:flex;align-items:center;gap:12px;
  margin:0 0 18px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.3em;text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor;opacity:.7}

.lede{
  max-width:60ch;font-size:clamp(1.02rem,1.5vw,1.18rem);
  line-height:1.82;color:var(--text-dim);
}

.section-head{display:grid;gap:10px;margin-bottom:clamp(24px,3.4vw,42px)}
.section-head > *{margin:0}

/* ===== 04. 头部：品牌轨道 ===== */
.skip-link{
  position:fixed;top:12px;left:16px;z-index:300;
  padding:10px 18px;border-radius:999px;
  background:var(--cyan);color:#04101F;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  box-shadow:0 12px 30px -12px rgba(0,0,0,.85);
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}
@media (min-width:1024px){
  .skip-link{left:calc(var(--rail-w) + 16px)}
}

.site-header{position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:120}

.rail{
  position:relative;
  display:flex;flex-direction:column;
  height:100%;
  padding:30px 22px 24px;
  overflow:hidden;
  background:
    linear-gradient(180deg,rgba(10,29,60,.97),rgba(7,21,46,.99) 46%,rgba(10,29,60,.97));
  border-right:1px solid var(--line);
  box-shadow:inset -1px 0 0 rgba(243,231,211,.05),22px 0 60px -50px rgba(53,230,224,.8);
}
.rail::before{
  content:"";position:absolute;top:0;right:0;bottom:0;width:14px;
  background-image:repeating-linear-gradient(180deg,rgba(157,246,241,.24) 0 1px,transparent 1px 18px);
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 12%,#000 88%,transparent);
  mask-image:linear-gradient(180deg,transparent,#000 12%,#000 88%,transparent);
  opacity:.75;pointer-events:none;
}
.rail::after{
  content:"";position:absolute;left:-60%;right:-60%;top:-24%;height:62%;
  background:radial-gradient(closest-side,rgba(53,230,224,.18),transparent 72%);
  pointer-events:none;
}

.rail__brand{position:relative;z-index:1;display:flex;align-items:center;gap:12px}
.rail__beacon{
  position:relative;flex:0 0 auto;width:13px;height:13px;border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#ffffff,var(--cyan) 55%,#0AA39E);
  box-shadow:0 0 14px 2px rgba(53,230,224,.7);
}
.rail__beacon::after{
  content:"";position:absolute;inset:-6px;border-radius:50%;
  border:1px solid rgba(53,230,224,.5);
  animation:beaconPulse 3.6s var(--ease) infinite;
}
.rail__mark{display:grid;gap:1px;text-decoration:none;color:var(--paper)}
.rail__name{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:.08em;line-height:1.2}
.rail__sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.28em;text-transform:uppercase;color:var(--mist);opacity:.85}

.nav-toggle{display:none}

.site-nav{
  position:relative;z-index:1;
  flex:1 1 auto;min-height:0;overflow-y:auto;overflow-x:hidden;
  margin-top:36px;
}
.site-nav::before{
  content:"NAVIGATION";
  display:block;padding:0 12px 10px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.32em;
  color:rgba(157,246,241,.4);
}
.site-nav__list{list-style:none;margin:0;padding:0;display:grid;gap:3px;counter-reset:navitem}
.site-nav__list > li{counter-increment:navitem}
.site-nav__link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:11px 12px 11px 10px;
  border:1px solid transparent;border-radius:var(--radius-sm);
  color:rgba(231,239,249,.74);
  font-size:15px;font-weight:500;letter-spacing:.02em;
  transition:color .25s var(--ease),background-color .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.site-nav__link::before{
  content:counter(navitem,decimal-leading-zero);
  min-width:18px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;
  color:rgba(157,246,241,.45);
}
.site-nav__link:hover{
  color:var(--paper);
  background:rgba(53,230,224,.07);
  border-color:rgba(53,230,224,.24);
  transform:translateX(2px);
}
.site-nav__link[aria-current="page"]{
  color:#04101F;
  font-weight:700;
  background:linear-gradient(100deg,var(--cyan),var(--mist));
  border-color:rgba(255,255,255,.45);
  box-shadow:0 0 26px -8px rgba(53,230,224,.9);
}
.site-nav__link[aria-current="page"]::before{color:rgba(4,16,31,.6)}

.rail__meta{
  position:relative;z-index:1;
  display:grid;gap:9px;
  margin-top:18px;padding-top:16px;
  border-top:1px solid var(--line);
}
.rail__version{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.09em;
  line-height:1.6;color:var(--haze);
}
.rail__utility{
  display:inline-flex;align-items:center;gap:8px;width:max-content;
  padding-bottom:2px;
  font-size:13px;color:var(--mist);
  border-bottom:1px solid rgba(157,246,241,.35);
  transition:color .25s var(--ease),border-color .25s var(--ease);
}
.rail__utility::after{content:"→";font-family:var(--font-mono);font-size:12px;transition:transform .25s var(--ease)}
.rail__utility:hover{color:var(--amber);border-bottom-color:rgba(242,184,75,.6)}
.rail__utility:hover::after{transform:translateX(3px)}

.rail__progress{
  position:absolute;top:0;right:0;bottom:0;width:2px;z-index:2;
  background:rgba(53,230,224,.1);
}
.rail__progress-bar{
  display:block;width:100%;height:100%;
  transform:scaleY(var(--progress,0));transform-origin:top center;
  background:linear-gradient(180deg,var(--cyan),var(--amber));
  box-shadow:0 0 12px rgba(53,230,224,.7);
}

/* --- 头部：平板 / 手机 --- */
@media (max-width:1023px){
  .site-header{position:fixed;top:0;left:0;right:0;bottom:auto;width:auto}
  .rail{
    height:var(--topbar-h);
    flex-direction:row;align-items:center;justify-content:space-between;
    gap:14px;padding:0 18px;
    overflow:visible;
    border-right:0;
    border-bottom:1px solid var(--line);
    background:linear-gradient(180deg,rgba(10,29,60,.98),rgba(7,21,46,.94));
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    box-shadow:0 18px 40px -34px rgba(0,0,0,.95);
  }
  .rail::before{display:none}
  .rail::after{top:-40%;bottom:auto;height:180%;opacity:.55}
  .rail__beacon{width:10px;height:10px}
  .rail__name{font-size:17px;letter-spacing:.06em}
  .rail__sub{font-size:9px;letter-spacing:.22em}

  .nav-toggle{
    display:inline-flex;align-items:center;gap:10px;
    padding:9px 14px;border-radius:999px;
    background:rgba(53,230,224,.08);
    border:1px solid rgba(53,230,224,.36);
    color:var(--mist);
    font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
    cursor:pointer;
    transition:background-color .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
  }
  .nav-toggle:hover{background:rgba(53,230,224,.16);color:var(--paper);border-color:rgba(242,184,75,.5)}
  .nav-toggle__bars{display:grid;gap:4px;width:16px}
  .nav-toggle__bars span{
    display:block;height:1.5px;border-radius:2px;background:currentColor;
    transition:transform .3s var(--ease),opacity .3s var(--ease);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}

  .site-nav{
    position:fixed;left:0;right:0;top:var(--topbar-h);
    margin:0;padding:12px 18px 24px;
    max-height:calc(100dvh - var(--topbar-h));
    overflow-y:auto;
    background:linear-gradient(180deg,rgba(8,24,50,.995),rgba(7,21,46,.995));
    border-bottom:1px solid var(--line-strong);
    box-shadow:0 34px 60px -30px rgba(0,0,0,.95);
    display:none;
  }
  .site-header[data-open] .site-nav{display:block;animation:navDrop .28s var(--ease) both}
  .site-nav::before{padding-bottom:8px}
  .site-nav__list{gap:2px}
  .site-nav__link{padding:13px 12px;font-size:16px}
  .rail__meta{display:none}
  .rail__progress{top:auto;left:0;right:0;bottom:-1px;width:auto;height:2px}
  .rail__progress-bar{transform:scaleX(var(--progress,0));transform-origin:left center}
}

@media (max-width:380px){
  .rail__sub{display:none}
  .rail__name{font-size:16px}
}

/* ===== 05. 页脚：灯塔基座 ===== */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(64px,9vw,140px);
  border-top:1px solid var(--line-strong);
  background:linear-gradient(180deg,rgba(7,21,46,.35),rgba(8,24,50,.92) 42%,#050F22);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:6%;width:min(620px,76%);height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan),var(--amber),transparent);
  opacity:.85;
}
.footer-glow{
  position:absolute;inset:auto 0 -40% 0;height:120%;pointer-events:none;
  background:
    radial-gradient(58% 58% at 80% 100%,rgba(53,230,224,.13),transparent 72%),
    radial-gradient(52% 52% at 10% 100%,rgba(242,184,75,.09),transparent 72%);
}
.footer-frame{
  position:relative;z-index:1;
  display:grid;gap:clamp(30px,4vw,54px);
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:clamp(40px,6vw,78px) var(--gutter) clamp(28px,4vw,48px);
  grid-template-columns:minmax(0,1fr);
}
.footer-kicker{
  margin:0 0 16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.28em;text-transform:uppercase;
  color:rgba(157,246,241,.5);
}
.footer-brand{
  display:inline-block;
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(1.9rem,4.2vw,2.75rem);
  line-height:1.04;letter-spacing:.05em;
  color:var(--paper);
  transition:color .3s var(--ease),text-shadow .3s var(--ease);
}
.footer-brand:hover{color:var(--cyan);text-shadow:0 0 30px rgba(53,230,224,.55)}
.footer-summary{max-width:30ch;margin-top:16px;font-size:15.5px;line-height:1.8;color:var(--text-dim)}
.footer-version{
  display:inline-flex;align-items:center;gap:8px;
  margin-top:20px;padding:6px 13px;
  border:1px solid rgba(242,184,75,.38);border-radius:999px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--amber);background:rgba(242,184,75,.06);
}

.footer-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(20px,3vw,34px)}
.footer-col__title{
  display:flex;align-items:center;gap:9px;
  margin:0 0 16px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.26em;text-transform:uppercase;color:var(--mist);
}
.footer-col__title::before{content:"";width:18px;height:1px;background:currentColor;opacity:.65}
.footer-list{list-style:none;display:grid;gap:10px}
.footer-link{
  display:inline-block;padding-bottom:2px;
  font-size:15px;color:var(--text-dim);
  border-bottom:1px solid transparent;
  transition:color .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.footer-link:hover{color:var(--paper);border-bottom-color:rgba(53,230,224,.55);transform:translateX(2px)}

.footer-contact{
  padding:clamp(18px,2.6vw,26px);
  border:1px solid rgba(26,18,13,.85);
  border-radius:var(--radius-md);
  background:var(--paper);
  color:var(--brown);
  box-shadow:8px 8px 0 -1px rgba(53,230,224,.2),var(--shadow-lift);
}
.footer-contact .footer-col__title{color:rgba(26,18,13,.62)}
.footer-contact__list{list-style:none;display:grid;gap:16px}
.footer-contact__item{display:grid;gap:3px;min-width:0}
.footer-contact__label{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;
  color:rgba(26,18,13,.52);
}
.footer-contact__value{
  font-size:14.5px;line-height:1.6;color:var(--brown);
  overflow-wrap:anywhere;
}
.copy-btn{
  justify-self:start;
  margin-top:5px;padding:4px 11px;
  border:1px solid rgba(26,18,13,.35);border-radius:999px;
  background:transparent;color:var(--brown);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;
  cursor:pointer;
  transition:background-color .2s var(--ease),border-color .2s var(--ease);
}
.copy-btn:hover{background:rgba(26,18,13,.08);border-color:rgba(26,18,13,.6)}
.copy-btn[data-state="done"]{background:rgba(53,230,224,.42);border-color:rgba(26,18,13,.65)}
.copy-btn[data-state="error"]{background:rgba(217,85,63,.18);border-color:rgba(217,85,63,.6)}
.footer-note{
  margin-top:16px;padding-top:12px;
  border-top:1px dashed rgba(26,18,13,.26);
  font-size:12.5px;line-height:1.72;color:rgba(26,18,13,.62);
}

.footer-base{
  position:relative;z-index:1;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px 26px;
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:20px var(--gutter) 34px;
  border-top:1px solid rgba(157,246,241,.12);
}
.footer-legal{
  margin:0;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--haze);
}
.footer-legal__links{list-style:none;display:flex;flex-wrap:wrap;gap:18px;margin:0}
.footer-legal__links a{
  font-size:12.5px;color:var(--text-dim);
  border-bottom:1px solid transparent;
  transition:color .25s var(--ease),border-color .25s var(--ease);
}
.footer-legal__links a:hover{color:var(--cyan);border-bottom-color:rgba(53,230,224,.6)}

@media (min-width:720px){
  .footer-frame{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-lede{grid-column:1 / -1}
}
@media (min-width:1120px){
  .footer-frame{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr) minmax(0,.9fr)}
  .footer-lede{grid-column:auto}
}

/* ===== 06. 通用组件 ===== */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin:0 0 clamp(18px,3vw,28px);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--haze);
}
.breadcrumbs li{display:flex;align-items:center;gap:10px;list-style:none}
.breadcrumbs li + li::before{content:"/";color:rgba(157,246,241,.35)}
.breadcrumbs a{color:var(--mist);transition:color .2s var(--ease)}
.breadcrumbs a:hover{color:var(--amber)}
.breadcrumbs [aria-current="page"]{color:var(--paper)}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 23px;border-radius:999px;
  border:1px solid var(--line-strong);
  background:transparent;color:var(--paper);
  font-family:var(--font-display);font-weight:700;font-size:15px;letter-spacing:.04em;
  cursor:pointer;
  transition:background-color .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease);
}
.btn::after{content:"→";font-family:var(--font-mono);font-size:13px;transition:transform .25s var(--ease)}
.btn:hover::after{transform:translateX(4px)}
.btn:hover{transform:translateY(-1px)}
.btn--primary{
  background:linear-gradient(100deg,var(--cyan),var(--mist));
  border-color:transparent;color:#04101F;
  box-shadow:0 0 30px -10px rgba(53,230,224,.95);
}
.btn--primary:hover{box-shadow:0 0 36px -8px rgba(53,230,224,1)}
.btn--amber{
  background:linear-gradient(100deg,var(--amber),#F7D089);
  border-color:transparent;color:#2B1A05;
}
.btn--ghost:hover{background:rgba(53,230,224,.1);border-color:rgba(53,230,224,.65)}

.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 11px;border-radius:999px;
  border:1px solid rgba(157,246,241,.32);
  background:rgba(53,230,224,.06);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--mist);
}
.chip--amber{border-color:rgba(242,184,75,.45);background:rgba(242,184,75,.08);color:var(--amber)}

.stat{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(1.8rem,3.2vw,2.7rem);line-height:1;letter-spacing:.02em;
  color:var(--amber);
}

.panel{
  padding:clamp(22px,3vw,38px);
  border:1px solid var(--line);border-radius:var(--radius-md);
  background:linear-gradient(158deg,rgba(14,44,85,.78),rgba(7,21,46,.88));
  box-shadow:var(--shadow-lift);
}
.panel--paper{
  background:var(--paper);color:var(--brown);
  border-color:rgba(26,18,13,.28);
  box-shadow:var(--shadow-lift);
}
.panel--paper h1,.panel--paper h2,.panel--paper h3,.panel--paper h4,.panel--paper strong{color:var(--brown)}
.panel--paper a{color:#8A3A24;border-bottom:1px solid rgba(138,58,36,.4)}
.panel--paper a:hover{color:var(--ember)}

.prose{max-width:68ch;color:var(--text-dim)}
.prose p{line-height:1.82}
.prose h2,.prose h3{margin-top:1.6em;color:var(--paper)}
.prose ul,.prose ol{padding-left:1.3em;margin-bottom:1em;display:grid;gap:.4em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li::marker{color:var(--cyan)}

.card{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:clamp(18px,2.6vw,28px);
  border:1px solid var(--line);border-radius:var(--radius-md);
  background:linear-gradient(150deg,rgba(18,44,85,.58),rgba(7,21,46,.72));
  box-shadow:var(--shadow-lift);
  transition:border-color .3s var(--ease),transform .3s var(--ease),box-shadow .3s var(--ease);
}
.card:hover{
  border-color:rgba(53,230,224,.44);
  transform:translateY(-3px);
  box-shadow:0 30px 60px -36px rgba(53,230,224,.4);
}
.card__kicker{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--cyan);
}
.card__title{font-family:var(--font-display);font-size:clamp(1.15rem,1.8vw,1.42rem);font-weight:700;color:var(--paper);line-height:1.3}
.card__text{font-size:15px;line-height:1.78;color:var(--text-dim)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--sidebar{grid-template-columns:minmax(0,1fr) minmax(240px,320px)}
@media (max-width:900px){
  .grid--2,.grid--3,.grid--sidebar{grid-template-columns:minmax(0,1fr)}
}

.timeline{list-style:none;margin:0;padding:0 0 0 24px;display:grid;border-left:1px solid var(--line-strong)}
.timeline__item{position:relative;padding:0 0 clamp(24px,3vw,34px) 4px}
.timeline__item::before{
  content:"";position:absolute;left:-28.5px;top:9px;
  width:8px;height:8px;border-radius:50%;
  background:var(--amber);box-shadow:0 0 0 4px rgba(242,184,75,.14);
}
.timeline__item:hover::before{animation:nodePulse .9s var(--ease) 1}
.timeline__stamp{
  display:block;margin-bottom:6px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--cyan);
}
.timeline__title{margin:0 0 6px;font-family:var(--font-display);font-size:1.1rem;color:var(--paper)}
.timeline__item p{font-size:15px;color:var(--text-dim);margin:0}

.filter-bar{
  display:flex;flex-wrap:wrap;gap:8px;
  width:max-content;max-width:100%;
  padding:6px;border:1px solid var(--line);border-radius:999px;
  background:rgba(7,21,46,.6);
}
.filter-btn{
  padding:8px 16px;border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--text-dim);cursor:pointer;
  transition:background-color .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.filter-btn:hover{color:var(--paper);border-color:rgba(53,230,224,.4)}
.filter-btn[aria-pressed="true"]{
  background:linear-gradient(100deg,var(--cyan),var(--mist));
  color:#04101F;border-color:transparent;
  box-shadow:0 0 20px -8px rgba(53,230,224,.9);
}
[data-filter-item][hidden]{display:none !important}

.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--line);border-radius:var(--radius-md);
  background:
    radial-gradient(120% 120% at 18% 0%,rgba(53,230,224,.2),transparent 62%),
    linear-gradient(150deg,var(--ink-800),var(--ink-900));
}
.media-frame > img,.media-frame > picture > img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,transparent 55%,rgba(7,21,46,.78));
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:1;
  padding:14px 18px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--mist);
}

.js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ===== 07. 动画 ===== */
@keyframes beaconPulse{
  0%{transform:scale(.82);opacity:.9}
  72%{transform:scale(1.55);opacity:0}
  100%{transform:scale(1.55);opacity:0}
}
@keyframes navDrop{
  from{opacity:0;transform:translateY(-10px)}
  to{opacity:1;transform:none}
}
@keyframes nodePulse{
  0%{box-shadow:0 0 0 4px rgba(242,184,75,.2)}
  100%{box-shadow:0 0 0 14px rgba(242,184,75,0)}
}

/* ===== 08. 可访问性与减弱动效 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .rail__beacon::after{animation:none;opacity:.55}
  .js [data-reveal]{opacity:1 !important;transform:none !important}
  .card:hover,.site-nav__link:hover,.footer-link:hover,.btn:hover{transform:none}
  .rail__progress-bar{transition:none}
}