/* ============ 变量 ============ */
:root{
  --ink-900:#070B1A;
  --ink-800:#101A3A;
  --ink-700:#18244C;
  --line:#26325C;
  --cyan:#39F0DA;
  --mist:#8FF8EC;
  --gold:#F3C46B;
  --magenta:#FF4F9A;
  --text:#F2F5FF;
  --muted:#A9B4D6;
  --green:#5BE49B;
  --rail-w:96px;
  --header-h:64px;
  --gutter:24px;
  --maxw:1440px;
  --radius-lg:32px;
  --radius-md:24px;
  --radius-pill:999px;
  --ease:180ms ease;
  --font-display:"HarmonyOS Sans SC Heavy","思源黑体 Heavy","Noto Sans SC",system-ui,sans-serif;
  --font-body:"思源黑体","PingFang SC","Noto Sans SC",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,monospace;
}

/* ============ Reset ============ */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;height:auto;}
button,input,select,textarea{font:inherit;color:inherit;}
a{color:var(--cyan);text-decoration:none;transition:color var(--ease);}
a:hover{color:var(--mist);}
[hidden]{display:none !important;}

/* ============ 基础排版 ============ */
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  letter-spacing:.01em;
  background:
    radial-gradient(1200px 700px at 88% -8%,rgba(57,240,218,.12),transparent 62%),
    radial-gradient(900px 620px at 4% 106%,rgba(243,196,107,.10),transparent 64%),
    var(--ink-900);
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.02em;
  text-wrap:balance;
}
p{text-wrap:pretty;}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px;}

/* ============ 跳转链接 ============ */
.skip-link{
  position:fixed;
  top:12px;left:12px;
  z-index:400;
  padding:10px 20px;
  border-radius:var(--radius-pill);
  background:var(--cyan);
  color:#04120F;
  font-size:14px;
  font-weight:700;
  transform:translateY(-220%);
  transition:transform var(--ease);
}
.skip-link:focus{transform:translateY(0);color:#04120F;}

/* ============ 页头 / 侧边轨道 ============ */
.site-header{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  z-index:120;
  --progress:0%;
  background:linear-gradient(180deg,rgba(16,26,58,.94),rgba(7,11,26,.98));
  border-right:1px solid var(--line);
}
.header-bar{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:10px;
  padding:18px 10px 14px;
  border-bottom:1px solid rgba(38,50,92,.7);
}
.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  color:var(--text);
}
.brand:hover{color:var(--mist);}
.brand__mark{
  display:grid;
  place-items:center;
  width:44px;height:44px;
  border-radius:16px;
  border:1px solid rgba(57,240,218,.45);
  background:radial-gradient(circle at 30% 20%,rgba(57,240,218,.42),transparent 68%),var(--ink-800);
  color:var(--cyan);
  font-family:var(--font-display);
  font-size:19px;
  line-height:1;
  box-shadow:0 0 24px rgba(57,240,218,.18);
}
.brand__text{display:flex;flex-direction:column;align-items:center;gap:4px;}
.brand__name{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-display);
  font-size:12px;
  line-height:1;
  letter-spacing:.22em;
}
.brand__tagline{
  display:none;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:var(--muted);
}
.nav-toggle{display:none;}
.site-nav{
  position:relative;
  flex:1 1 auto;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  padding:14px 8px 16px;
  overflow-y:auto;
  overflow-x:hidden;
  scrollbar-width:thin;
  scrollbar-color:var(--line) transparent;
}
.site-nav::-webkit-scrollbar{width:4px;}
.site-nav::-webkit-scrollbar-thumb{background:var(--line);border-radius:2px;}
.rail-note{
  display:none;
  writing-mode:vertical-rl;
  text-orientation:mixed;
  margin:0;
  padding:6px 0;
  font-family:var(--font-mono);
  font-size:10px;
  line-height:1.2;
  letter-spacing:.26em;
  color:var(--muted);
}
@media (min-width:1024px) and (min-height:880px){
  .rail-note{display:block;}
}
.nav-list{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:10px;
  width:100%;
}
.nav-list__item{
  width:100%;
  display:flex;
  justify-content:center;
}
.nav-link{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  width:100%;
  padding:8px 4px;
  border-radius:16px;
  color:var(--muted);
  transition:color var(--ease),background var(--ease);
}
.nav-link__index{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--line);
  transition:color var(--ease);
}
.nav-link__label{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-size:12px;
  line-height:1;
  letter-spacing:.22em;
}
.nav-link::before{
  content:"";
  position:absolute;
  left:-8px;top:50%;
  width:3px;height:0;
  border-radius:3px;
  background:var(--cyan);
  transform:translateY(-50%);
  transition:height var(--ease),background var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible{color:var(--text);background:rgba(57,240,218,.07);}
.nav-link:hover::before{height:16px;background:var(--mist);}
.nav-link[aria-current="page"]{color:var(--text);background:rgba(57,240,218,.10);}
.nav-link[aria-current="page"]::before{height:26px;background:var(--cyan);}
.nav-link[aria-current="page"] .nav-link__index{color:var(--gold);}
.nav-link[aria-current="page"] .nav-link__label{color:var(--cyan);}
.rail-quick{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  width:100%;
  margin-top:auto;
  padding-top:12px;
  border-top:1px solid rgba(38,50,92,.7);
}
.rail-chip{
  display:flex;
  align-items:center;
  justify-content:center;
  width:40px;height:40px;
  border-radius:14px;
  border:1px solid var(--line);
  background:rgba(16,26,58,.8);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.02em;
  transition:background var(--ease),color var(--ease),border-color var(--ease),transform var(--ease);
}
.rail-chip:hover,
.rail-chip:focus-visible{
  color:#04120F;
  background:var(--cyan);
  border-color:var(--cyan);
  transform:translateY(-1px);
}
.rail-chip--gold{color:var(--gold);border-color:rgba(243,196,107,.45);}
.rail-chip--gold:hover,
.rail-chip--gold:focus-visible{background:var(--gold);border-color:var(--gold);color:#20160A;}
.rail-chip__mark{display:block;}
.rail-chip__text{display:none;}
.rail-progress{
  position:absolute;
  top:0;right:0;bottom:0;
  width:3px;
  background:rgba(38,50,92,.45);
  pointer-events:none;
}
.rail-progress__bar{
  display:block;
  width:100%;
  height:var(--progress,0%);
  border-radius:0 0 3px 3px;
  background:linear-gradient(180deg,var(--cyan),var(--gold));
  transition:height 120ms linear;
}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,112px);
  padding:64px var(--gutter) 32px;
  overflow:hidden;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(16,26,58,.9),var(--ink-900) 70%);
}
.footer-glow{
  position:absolute;
  inset:-40% -10% auto -10%;
  height:420px;
  pointer-events:none;
  background:
    radial-gradient(60% 100% at 22% 0%,rgba(57,240,218,.16),transparent 70%),
    radial-gradient(50% 100% at 82% 0%,rgba(243,196,107,.12),transparent 70%);
}
.footer-inner{
  position:relative;
  max-width:var(--maxw);
  margin:0 auto;
  display:grid;
  grid-template-columns:1.15fr 2fr 1fr;
  gap:40px 32px;
}
.footer-brand__mark{
  display:inline-block;
  font-family:var(--font-display);
  font-size:22px;
  letter-spacing:.14em;
  color:var(--text);
}
.footer-brand__mark:hover{color:var(--cyan);}
.footer-brand__tagline{
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-brand__note{
  margin-top:16px;
  max-width:26ch;
  font-size:14px;
  color:var(--muted);
}
.footer-status{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:20px;
}
.footer-status__item{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 12px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(38,50,92,.9);
  background:rgba(16,26,58,.7);
  font-size:12px;
  color:var(--muted);
}
.footer-status__dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 4px rgba(91,228,155,.16);
}
.footer-brand__cta{margin-top:22px;}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-list{
  display:flex;
  flex-direction:column;
  gap:10px;
}
.footer-link{
  position:relative;
  display:inline-block;
  font-size:14px;
  color:var(--muted);
  transition:color var(--ease),transform var(--ease);
}
.footer-link::before{
  content:"";
  position:absolute;
  left:-12px;top:50%;
  width:6px;height:1px;
  background:var(--cyan);
  opacity:0;
  transform:translateY(-50%);
  transition:opacity var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible{color:var(--text);transform:translateX(4px);}
.footer-link:hover::before{opacity:1;}
.footer-contact__mail{
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--text);
  word-break:break-all;
}
.footer-contact__note{
  margin-top:8px;
  font-size:12px;
  color:var(--muted);
}
.footer-contact__phone{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--gold);
}
.footer-contact__addr{
  margin-top:8px;
  font-size:13px;
  color:var(--muted);
}
.footer-base{
  position:relative;
  max-width:var(--maxw);
  margin:48px auto 0;
  padding-top:22px;
  border-top:1px solid rgba(38,50,92,.8);
  display:flex;
  flex-wrap:wrap;
  gap:10px 32px;
  justify-content:space-between;
  font-size:12px;
  color:var(--muted);
}
.footer-base__copy{margin:0;}
.footer-base__meta{
  margin:0;
  font-family:var(--font-mono);
  letter-spacing:.04em;
}

/* ============ 布局通用 ============ */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
}
.section{padding:clamp(48px,7vw,96px) 0;}
.section--tight{padding:clamp(32px,4vw,56px) 0;}
.section__title{
  font-family:var(--font-display);
  font-size:clamp(28px,3vw,44px);
  line-height:1.15;
  letter-spacing:-.02em;
}
.section__lead{
  margin-top:14px;
  max-width:62ch;
  font-size:16px;
  color:var(--muted);
}
.split{
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:clamp(24px,4vw,56px);
  align-items:start;
}
.split--reverse{grid-template-columns:5fr 7fr;}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gutter);
}
.panel{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:clamp(20px,3vw,36px);
}
.rhythm-bar{
  height:2px;
  width:100%;
  border-radius:2px;
  background:linear-gradient(90deg,transparent,var(--line) 12%,rgba(57,240,218,.7) 50%,var(--line) 88%,transparent);
}
.rhythm-bar__spark{
  display:block;
  width:6px;height:6px;
  margin:-2px auto 0;
  border-radius:50%;
  background:var(--magenta);
  box-shadow:0 0 12px var(--magenta);
}

/* ============ 文本组件 ============ */
.side-note{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.num-note{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--gold);
}
.pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(57,240,218,.35);
  background:rgba(57,240,218,.08);
  color:var(--cyan);
  font-size:12px;
  line-height:1.6;
}
.pill--gold{
  color:var(--gold);
  border-color:rgba(243,196,107,.4);
  background:rgba(243,196,107,.08);
}
.pill--magenta{
  color:var(--magenta);
  border-color:rgba(255,79,154,.4);
  background:rgba(255,79,154,.08);
}
.pill--muted{
  color:var(--muted);
  border-color:var(--line);
  background:rgba(38,50,92,.35);
}
.status-dot{
  display:inline-block;
  width:6px;height:6px;
  border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 3px rgba(91,228,155,.15);
}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 26px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  cursor:pointer;
  transition:background var(--ease),color var(--ease),border-color var(--ease),transform var(--ease);
}
.btn--primary{
  background:var(--cyan);
  color:#04120F;
  box-shadow:0 0 0 1px rgba(57,240,218,.35),0 12px 32px rgba(57,240,218,.18);
}
.btn--primary:hover{background:var(--mist);color:#04120F;transform:translateY(-2px);}
.btn--gold{background:var(--gold);color:#20160A;}
.btn--gold:hover{background:#FFD68F;color:#20160A;transform:translateY(-2px);}
.btn--ghost{
  background:transparent;
  border-color:var(--line);
  color:var(--text);
}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px);}

/* ============ 卡片 ============ */
.card{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  padding:clamp(20px,3vw,28px);
  transition:border-color var(--ease),transform var(--ease);
}
.card:hover{border-color:rgba(57,240,218,.5);transform:translateY(-2px);}
.card__title{
  font-family:var(--font-display);
  font-size:20px;
  letter-spacing:-.01em;
}
.card__text{
  margin-top:10px;
  font-size:15px;
  color:var(--muted);
}
.card__meta{
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--cyan);
}

/* ============ 图片容器 ============ */
.media{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius-lg);
  border:1px solid var(--line);
  background:linear-gradient(140deg,var(--ink-800),#0A1226 65%);
  aspect-ratio:16 / 10;
}
.media--wide{aspect-ratio:21 / 9;}
.media--tall{aspect-ratio:3 / 4;}
.media--square{aspect-ratio:1 / 1;}
.media__img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media__caption{
  position:absolute;
  left:16px;bottom:16px;
  padding:6px 12px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(57,240,218,.3);
  background:rgba(7,11,26,.72);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  backdrop-filter:blur(6px);
}

/* ============ 面包屑 ============ */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.breadcrumb__item{
  display:inline-flex;
  align-items:center;
  gap:8px;
}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--line);}
.breadcrumb__link{color:var(--muted);}
.breadcrumb__link:hover{color:var(--cyan);}
.breadcrumb__current{color:var(--text);}

/* ============ 手风琴 ============ */
.accordion{
  display:flex;
  flex-direction:column;
  gap:12px;
}
.accordion__item{
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  background:rgba(16,26,58,.65);
  overflow:hidden;
  transition:border-color var(--ease);
}
.accordion__item:hover{border-color:rgba(57,240,218,.45);}
.accordion__trigger{
  display:flex;
  width:100%;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 20px;
  border:0;
  background:none;
  text-align:left;
  font-size:16px;
  font-weight:600;
  color:var(--text);
  cursor:pointer;
  transition:color var(--ease);
}
.accordion__trigger:hover{color:var(--cyan);}
.accordion__trigger[aria-expanded="true"]{color:var(--gold);}
.accordion__icon{
  position:relative;
  flex:0 0 auto;
  width:22px;height:22px;
}
.accordion__icon::before,
.accordion__icon::after{
  content:"";
  position:absolute;
  border-radius:2px;
  background:currentColor;
  transition:transform var(--ease),opacity var(--ease);
}
.accordion__icon::before{top:50%;left:2px;right:2px;height:2px;transform:translateY(-50%);}
.accordion__icon::after{left:50%;top:2px;bottom:2px;width:2px;transform:translateX(-50%);}
.accordion__trigger[aria-expanded="true"] .accordion__icon::after{opacity:0;}
.accordion__panel{
  padding:0 20px 20px;
  font-size:15px;
  color:var(--muted);
}

/* ============ 筛选 ============ */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.filter-btn{
  padding:9px 18px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:rgba(16,26,58,.7);
  color:var(--muted);
  font-size:13px;
  cursor:pointer;
  transition:background var(--ease),color var(--ease),border-color var(--ease);
}
.filter-btn:hover{border-color:var(--cyan);color:var(--text);}
.filter-btn[aria-pressed="true"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#04120F;
  font-weight:600;
}
.filter-empty{
  padding:24px;
  border:1px dashed var(--line);
  border-radius:var(--radius-md);
  text-align:center;
  font-size:14px;
  color:var(--muted);
}

/* ============ 显现 ============ */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity 420ms ease,transform 420ms cubic-bezier(.22,.61,.36,1);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-visible{opacity:1;transform:none;}

/* ============ 桌面内容区偏移 ============ */
@media (min-width:1024px){
  body{padding-left:var(--rail-w);}
}

/* ============ 平板 / 移动 ============ */
@media (max-width:1023px){
  body{
    padding-left:0;
    padding-top:var(--header-h);
  }
  .site-header{
    inset:0 0 auto 0;
    width:auto;
    height:var(--header-h);
    flex-direction:row;
    align-items:center;
    border-right:0;
    border-bottom:1px solid var(--line);
    background:rgba(7,11,26,.92);
    backdrop-filter:blur(14px);
  }
  .header-bar{
    position:relative;
    z-index:130;
    flex-direction:row;
    width:100%;
    height:100%;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    padding:0 16px;
    border-bottom:0;
  }
  .brand{flex-direction:row;gap:10px;}
  .brand__mark{width:36px;height:36px;border-radius:12px;font-size:16px;}
  .brand__text{align-items:flex-start;gap:1px;}
  .brand__name{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.08em;
  }
  .brand__tagline{display:block;font-size:9px;}
  .nav-toggle{
    display:inline-flex;
    flex-direction:column;
    justify-content:center;
    gap:5px;
    width:44px;height:44px;
    padding:0 11px;
    border:1px solid var(--line);
    border-radius:14px;
    background:rgba(16,26,58,.8);
    cursor:pointer;
    transition:border-color var(--ease);
  }
  .nav-toggle__bar{
    display:block;
    width:100%;height:2px;
    border-radius:2px;
    background:var(--text);
    transition:transform var(--ease),opacity var(--ease),background var(--ease);
  }
  .site-header[data-open] .nav-toggle{border-color:var(--cyan);}
  .site-header[data-open] .nav-toggle__bar{background:var(--cyan);}
  .site-header[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .site-header[data-open] .nav-toggle__bar:nth-child(2){opacity:0;}
  .site-header[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
  .site-nav{
    position:fixed;
    top:var(--header-h);right:0;bottom:0;
    width:min(340px,86vw);
    z-index:110;
    align-items:stretch;
    gap:18px;
    padding:22px 18px 34px;
    border-left:1px solid var(--line);
    background:linear-gradient(180deg,rgba(16,26,58,.99),rgba(7,11,26,.99));
    overflow-y:auto;
    transform:translateX(102%);
    transition:transform 240ms cubic-bezier(.22,.61,.36,1);
  }
  .site-header[data-open] .site-nav{transform:translateX(0);}
  .rail-note{
    display:block;
    writing-mode:horizontal-tb;
    padding:0;
    font-size:11px;
    letter-spacing:.18em;
    color:var(--mist);
  }
  .nav-list{align-items:stretch;gap:6px;}
  .nav-list__item{justify-content:stretch;}
  .nav-link{
    flex-direction:row;
    align-items:center;
    justify-content:flex-start;
    gap:12px;
    padding:12px 14px;
    border-radius:16px;
    border:1px solid rgba(38,50,92,.7);
    background:rgba(255,255,255,.02);
  }
  .nav-link__index{font-size:11px;}
  .nav-link__label{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.06em;
  }
  .nav-link::before{display:none;}
  .nav-link[aria-current="page"]{border-color:rgba(57,240,218,.55);}
  .rail-quick{
    flex-direction:row;
    align-items:stretch;
    gap:10px;
    margin-top:8px;
    padding-top:16px;
    border-top:1px solid var(--line);
  }
  .rail-chip{
    flex:1 1 0;
    width:auto;height:auto;
    gap:8px;
    padding:10px 12px;
    border-radius:var(--radius-pill);
    font-size:12px;
  }
  .rail-chip__text{
    display:inline;
    font-family:var(--font-body);
    font-size:12px;
    color:inherit;
  }
  .rail-progress{
    position:fixed;
    top:var(--header-h);left:0;right:0;bottom:auto;
    width:auto;height:2px;
    background:rgba(38,50,92,.75);
  }
  .rail-progress__bar{
    width:var(--progress,0%);
    height:100%;
    border-radius:0;
    background:linear-gradient(90deg,var(--cyan),var(--gold));
    transition:width 120ms linear;
  }
  .footer-inner{grid-template-columns:1fr 1fr;}
  .footer-brand{grid-column:1 / -1;}
  .footer-contact{grid-column:1 / -1;}
  .split,
  .split--reverse{grid-template-columns:1fr;}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}
}

@media (max-width:720px){
  :root{--gutter:18px;}
  .footer-inner{grid-template-columns:1fr;}
  .footer-nav{grid-template-columns:1fr 1fr;gap:24px 20px;}
  .footer-base{flex-direction:column;align-items:flex-start;}
  .section__lead{font-size:15px;}
  .btn{width:100%;}
  .media--wide{aspect-ratio:16 / 10;}
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important;}
}