/* =========================================================
   legacy-bandao.com.cn — 共享样式 /assets/site.css
   深海蓝与半岛绿主色 · 琥珀橙只标记“此刻”
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root{
  --deep-900:#071A2B;
  --deep-700:#0E2C45;
  --deep-500:#14405F;
  --green-600:#1FA37A;
  --green-400:#5FD3A8;
  --green-800:#0F6B52;
  --amber-500:#E8A33D;
  --amber-200:#F6D9A8;
  --white-100:#F2F6F8;
  --gray-400:#9BB0BF;
  --ink-50:#04101B;

  --text-soft:#C3D2DD;
  --text-dim:#8FA5B5;

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular","Roboto Mono",Consolas,"Courier New",monospace;

  --r-lg:28px;
  --r-md:20px;
  --r-sm:14px;
  --r-pill:999px;

  --shell:1320px;
  --gutter:clamp(18px,3.4vw,40px);

  --t-fast:.16s ease;
  --t-base:.22s ease;
  --t-slow:.5s ease;
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,ul,ol,dl,dd,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
::selection{background:rgba(31,163,122,.34);color:var(--white-100)}

/* ---------- 3. 页面基底 ---------- */
body{
  min-height:100vh;
  background:var(--deep-900);
  color:var(--white-100);
  font-family:var(--font-sans);
  font-size:clamp(16px,1.02vw,17.5px);
  line-height:1.75;
  letter-spacing:.005em;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(1100px 620px at 84% -12%,rgba(31,163,122,.13),transparent 62%),
    radial-gradient(880px 520px at -10% 6%,rgba(232,163,61,.07),transparent 60%),
    repeating-linear-gradient(180deg,rgba(155,176,191,.045) 0 1px,transparent 1px 6px);
}
:focus-visible{
  outline:2px solid var(--green-400);
  outline-offset:2px;
  border-radius:8px;
}

/* ---------- 4. 排版 ---------- */
h1,h2,h3,h4,h5{font-weight:700;letter-spacing:-.01em;line-height:1.2}
h1,h2{line-height:1.12}
.display{
  font-size:clamp(36px,5.6vw,76px);
  line-height:1.05;
  letter-spacing:-.024em;
  font-weight:700;
}
.h2{font-size:clamp(25px,3.2vw,42px);line-height:1.16;letter-spacing:-.018em}
.h3{font-size:clamp(19px,2vw,26px);line-height:1.28}
.lead{
  font-size:clamp(17px,1.45vw,21px);
  line-height:1.72;
  color:var(--text-soft);
  font-weight:400;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--green-400);
}
.eyebrow::before{content:"";width:20px;height:1px;background:var(--green-600);flex:0 0 auto}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.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;
}

/* ---------- 5. 布局 ---------- */
.container{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--narrow{max-width:920px}
.section{
  position:relative;
  padding-block:clamp(56px,7.6vw,104px);
}
.section--tight{padding-block:clamp(30px,4.2vw,54px)}
.section--panel{background:var(--deep-700)}
.section--light{
  background:var(--white-100);
  color:var(--deep-900);
}
.section--light .lead{color:#41586B}
.section--light .eyebrow{color:var(--green-800)}
.section--light .eyebrow::before{background:var(--green-800)}
.section--light .stat,
.section--light .card{
  background:#FFFFFF;
  border-color:rgba(20,64,95,.16);
  color:var(--deep-900);
}
.section--light .stat__num{color:var(--deep-900)}
.section--light .stat__label,
.section--light .card__meta{color:#5A7285}
.section--light .prose{color:#2C4356}
.section--light .prose a{color:var(--green-800)}
.section--light .prose li::before{background:var(--green-800)}

.grid{
  display:grid;
  gap:clamp(16px,2vw,26px);
}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.grid--4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.stack{display:grid;gap:14px}

/* ---------- 6. 正文 ---------- */
.prose{
  max-width:72ch;
  font-size:17px;
  line-height:1.85;
  color:var(--text-soft);
}
.prose > * + *{margin-top:1.05em}
.prose h2{
  margin-top:2.2em;
  font-size:clamp(23px,2.6vw,32px);
  color:var(--white-100);
}
.prose h3{
  margin-top:1.7em;
  font-size:clamp(18px,1.9vw,23px);
  color:var(--white-100);
}
.section--light .prose h2,
.section--light .prose h3{color:var(--deep-900)}
.prose ul,.prose ol{display:grid;gap:.55em}
.prose li{position:relative;padding-left:20px}
.prose li::before{
  content:"";
  position:absolute;
  left:0;top:.78em;
  width:8px;height:1px;
  background:var(--green-600);
}
.prose a{
  color:var(--green-400);
  text-decoration:underline;
  text-decoration-color:rgba(95,211,168,.35);
  text-underline-offset:3px;
  transition:text-decoration-color var(--t-fast),color var(--t-fast);
}
.prose a:hover{text-decoration-color:var(--green-400)}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:44px;
  padding:0 22px;
  border-radius:var(--r-pill);
  border:1px solid transparent;
  background:transparent;
  font-size:14.5px;
  font-weight:600;
  letter-spacing:.01em;
  white-space:nowrap;
  cursor:pointer;
  transition:background var(--t-fast),color var(--t-fast),border-color var(--t-fast),transform var(--t-fast),box-shadow var(--t-fast);
}
.btn--primary{
  background:var(--green-600);
  color:var(--ink-50);
  box-shadow:0 12px 26px -16px rgba(31,163,122,.95);
}
.btn--primary:hover{background:var(--green-400);transform:translateY(-1px)}
.btn--ghost{
  border-color:var(--deep-500);
  color:var(--white-100);
}
.btn--ghost:hover{
  border-color:var(--green-400);
  color:var(--green-400);
  background:rgba(31,163,122,.08);
  transform:translateY(-1px);
}
.btn--amber{
  background:var(--amber-500);
  color:#2A1A03;
}
.btn--amber:hover{background:var(--amber-200);transform:translateY(-1px)}
.btn--sm{height:36px;padding:0 16px;font-size:13.5px}

/* ---------- 8. 胶囊与筛选带 ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:36px;
  padding:0 15px;
  border-radius:var(--r-pill);
  border:1px solid var(--deep-500);
  background:transparent;
  color:var(--text-soft);
  font-size:13.5px;
  cursor:pointer;
  white-space:nowrap;
  transition:color var(--t-fast),background var(--t-fast),border-color var(--t-fast);
}
.chip:hover{border-color:var(--green-400);color:var(--white-100)}
.chip[aria-pressed="true"]{
  background:var(--green-600);
  border-color:var(--green-600);
  color:var(--ink-50);
  font-weight:600;
}
.chip__count{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:11px;
  color:var(--gray-400);
}
.chip[aria-pressed="true"] .chip__count{color:rgba(4,16,27,.7)}

.filterbar{
  display:flex;
  align-items:center;
  gap:10px;
  padding:11px 12px;
  border-radius:var(--r-pill);
  background:rgba(14,44,69,.78);
  border:1px solid var(--deep-500);
  overflow-x:auto;
  overflow-y:hidden;
  scrollbar-width:none;
}
.filterbar::-webkit-scrollbar{display:none}
.filterbar__group{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.filterbar__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--gray-400);
  padding-inline:8px 2px;
  white-space:nowrap;
}
.filterbar__sep{
  width:1px;
  height:22px;
  background:var(--deep-500);
  flex:0 0 auto;
}

.tag{
  display:inline-flex;
  align-items:center;
  height:24px;
  padding:0 10px;
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  background:rgba(31,163,122,.12);
  color:var(--green-400);
  border:1px solid rgba(31,163,122,.28);
  white-space:nowrap;
}
.tag--amber{
  background:rgba(232,163,61,.14);
  color:var(--amber-500);
  border-color:rgba(232,163,61,.32);
}
.tag--muted{
  background:rgba(155,176,191,.1);
  color:var(--gray-400);
  border-color:rgba(155,176,191,.22);
}

/* ---------- 9. 数据切片 ---------- */
.stat-grid{
  display:grid;
  gap:14px;
  grid-template-columns:repeat(auto-fit,minmax(158px,1fr));
}
.stat{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding:18px 20px;
  background:var(--deep-700);
  border:1px solid var(--deep-500);
  border-radius:var(--r-md);
  transition:transform var(--t-base),border-color var(--t-base),background var(--t-base);
}
.stat:hover{
  transform:translateY(-2px);
  border-color:rgba(31,163,122,.48);
  background:#102F4A;
}
.stat__num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(30px,3.6vw,44px);
  line-height:1;
  letter-spacing:-.012em;
  color:var(--white-100);
}
.stat__unit{
  font-size:.42em;
  margin-left:4px;
  letter-spacing:.04em;
  color:var(--gray-400);
}
.stat__label{font-size:13.5px;color:var(--gray-400);line-height:1.5}
.stat--amber .stat__num{color:var(--amber-500)}

/* ---------- 10. 卡片 ---------- */
.card{
  padding:clamp(20px,2.4vw,30px);
  background:var(--deep-700);
  border:1px solid var(--deep-500);
  border-radius:var(--r-lg);
  transition:transform var(--t-base),border-color var(--t-base),box-shadow var(--t-base),background var(--t-base);
}
.card:hover{
  transform:translateY(-2px);
  border-color:rgba(31,163,122,.42);
  background:#102F4A;
  box-shadow:0 26px 48px -36px rgba(0,0,0,.98);
}
.card__meta{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--gray-400);
}
.card__title{
  margin-top:10px;
  font-size:clamp(18px,1.9vw,22px);
  font-weight:600;
  line-height:1.35;
}
.card__body{
  margin-top:10px;
  font-size:15px;
  line-height:1.75;
  color:var(--text-dim);
}

/* ---------- 11. 时间轴 ---------- */
.timeline{
  position:relative;
  padding-left:26px;
}
.timeline::before{
  content:"";
  position:absolute;
  left:5px;top:8px;bottom:8px;
  width:1px;
  background:linear-gradient(180deg,var(--green-600),rgba(20,64,95,.35));
}
.timeline__item{
  position:relative;
  padding-bottom:26px;
}
.timeline__item:last-child{padding-bottom:0}
.timeline__item::before{
  content:"";
  position:absolute;
  left:-26px;top:8px;
  width:11px;height:11px;
  border-radius:50%;
  background:var(--deep-900);
  border:2px solid var(--green-600);
}
.timeline__item[data-state="now"]::before{
  border-color:var(--amber-500);
  box-shadow:0 0 0 5px rgba(232,163,61,.16);
}
.timeline__time{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--amber-500);
}
.timeline__title{margin-top:3px;font-size:17px;font-weight:600;line-height:1.4}
.timeline__desc{margin-top:5px;font-size:14.5px;line-height:1.7;color:var(--gray-400)}

/* ---------- 12. 技能树式路径 ---------- */
.pathway{
  display:grid;
  gap:14px;
  grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
}
.pathway__node{
  position:relative;
  padding:20px;
  background:var(--deep-700);
  border:1px solid var(--deep-500);
  border-radius:var(--r-md);
  transition:transform var(--t-base),border-color var(--t-base),background var(--t-base);
}
.pathway__node:hover{
  transform:translateY(-2px);
  border-color:rgba(31,163,122,.5);
  background:#102F4A;
}
.pathway__node::after{
  content:"";
  position:absolute;
  right:-14px;top:50%;
  width:14px;height:1px;
  background:var(--deep-500);
}
.pathway__node:last-child::after{display:none}
.pathway__step{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--green-400);
}
.pathway__title{margin-top:9px;font-size:17px;font-weight:600}
.pathway__desc{margin-top:6px;font-size:14px;line-height:1.7;color:var(--gray-400)}

/* ---------- 13. 图片容器 ---------- */
.img-frame{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  border-radius:var(--r-lg);
  border:1px solid var(--deep-500);
  background:linear-gradient(150deg,var(--deep-700),var(--deep-900));
}
.img-frame > img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.img-frame--16x9{aspect-ratio:16/9}
.img-frame--4x3{aspect-ratio:4/3}
.img-frame--3x2{aspect-ratio:3/2}
.img-frame--1x1{aspect-ratio:1/1}
.img-frame--21x9{aspect-ratio:21/9}
.img-frame--tall{aspect-ratio:3/4}
.img-frame--scrim::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(4,16,27,0) 42%,rgba(4,16,27,.62));
}
.img-frame__caption{
  position:absolute;
  left:14px;bottom:12px;
  z-index:2;
  max-width:calc(100% - 28px);
  padding:4px 12px;
  border-radius:var(--r-pill);
  background:rgba(4,16,27,.66);
  border:1px solid rgba(20,64,95,.7);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--white-100);
}

/* ---------- 14. 分隔与刻度 ---------- */
.divider{
  height:1px;
  border:0;
  margin-block:clamp(28px,4vw,48px);
  background:linear-gradient(90deg,rgba(20,64,95,.12),rgba(20,64,95,.92),rgba(20,64,95,.12));
}
.track{
  position:relative;
  height:1px;
  margin-block:clamp(30px,4vw,54px);
  background:var(--deep-500);
}
.track::before{
  content:"";
  position:absolute;
  left:0;top:-3px;
  width:100%;height:7px;
  background:repeating-linear-gradient(90deg,var(--deep-500) 0 1px,transparent 1px 56px);
}

/* ---------- 15. 面包屑 ---------- */
.breadcrumbs{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--gray-400);
}
.breadcrumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 10px;
}
.breadcrumbs li{display:inline-flex;align-items:center;gap:10px}
.breadcrumbs li:not(:first-child)::before{content:"/";color:var(--deep-500)}
.breadcrumbs a{transition:color var(--t-fast)}
.breadcrumbs a:hover{color:var(--green-400)}

/* ---------- 16. 跳过链接 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-72px;
  z-index:140;
  padding:10px 18px;
  border-radius:var(--r-pill);
  background:var(--green-600);
  color:var(--ink-50);
  font-size:14px;
  font-weight:600;
  transition:top var(--t-base);
}
.skip-link:focus{top:12px}

/* ---------- 17. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--deep-900);
  border-bottom:1px solid var(--deep-500);
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:1px;
  pointer-events:none;
  background:linear-gradient(90deg,rgba(4,16,27,0),rgba(31,163,122,.6),rgba(232,163,61,.38),rgba(4,16,27,0));
  opacity:.75;
}
.scroll-meter{
  position:absolute;
  left:0;bottom:-1px;
  height:2px;width:0;
  z-index:3;
  pointer-events:none;
  background:linear-gradient(90deg,var(--green-600),var(--amber-500));
}
.header-inner{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,22px);
  min-height:72px;
  padding-block:10px;
}
.brand{
  display:inline-flex;
  flex-direction:column;
  gap:1px;
  flex:0 0 auto;
  min-width:0;
}
.brand__mark{
  display:flex;
  align-items:center;
  gap:9px;
  font-size:clamp(17px,1.5vw,20px);
  font-weight:700;
  letter-spacing:-.012em;
  line-height:1.2;
  color:var(--white-100);
}
.brand__dot{
  width:9px;height:9px;
  flex:0 0 auto;
  border-radius:50%;
  background:var(--green-600);
  box-shadow:0 0 0 4px rgba(31,163,122,.16);
}
.brand__line{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.09em;
  color:var(--gray-400);
  white-space:nowrap;
}
.header-note{
  margin-left:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:#6C8598;
  white-space:nowrap;
}
.nav{
  display:flex;
  align-items:center;
  gap:4px;
  margin-left:auto;
}
.nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  height:38px;
  padding:0 15px;
  border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:14.5px;
  color:#A9BCC9;
  white-space:nowrap;
  transition:color var(--t-fast),background var(--t-fast),border-color var(--t-fast);
}
.nav__link:hover{
  color:var(--white-100);
  background:var(--deep-700);
  border-color:var(--deep-500);
}
.nav__link[aria-current="page"]{
  color:var(--green-400);
  background:rgba(31,163,122,.12);
  border-color:rgba(31,163,122,.42);
}
.nav__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:50%;bottom:-13px;
  width:16px;height:2px;
  transform:translateX(-50%);
  border-radius:2px;
  background:var(--green-600);
}
.header-cta{flex:0 0 auto}
.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:44px;height:44px;
  margin-left:auto;
  border-radius:var(--r-sm);
  border:1px solid var(--deep-500);
  background:var(--deep-700);
  color:var(--white-100);
  cursor:pointer;
  transition:border-color var(--t-fast),background var(--t-fast);
}
.nav-toggle:hover{border-color:var(--green-400);background:#102F4A}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;height:2px;
  border-radius:2px;
  background:currentColor;
  transition:background var(--t-base);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform var(--t-base);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

/* 左侧章节刻度轨道 */
.rail{
  position:fixed;
  left:0;top:72px;bottom:0;
  width:22px;
  z-index:40;
  pointer-events:none;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:30px;
  padding-left:7px;
  border-right:1px solid rgba(20,64,95,.5);
}
.rail__tick{
  width:7px;height:1px;
  background:rgba(20,64,95,.9);
}
.rail__tick--on{
  width:14px;height:2px;
  background:var(--green-600);
}

/* ---------- 18. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,90px);
  background:var(--ink-50);
  border-top:1px solid var(--deep-500);
  color:var(--gray-400);
  font-size:14.5px;
}
.footer-inner{
  display:grid;
  gap:clamp(26px,3vw,48px);
  grid-template-columns:minmax(0,1.05fr) minmax(0,2fr);
  padding-block:clamp(38px,5vw,64px);
}
.footer-brand__mark{
  display:flex;
  align-items:center;
  gap:9px;
  font-size:20px;
  font-weight:700;
  letter-spacing:-.012em;
  color:var(--white-100);
}
.footer-brand__line{
  margin-top:12px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.09em;
  color:var(--green-400);
}
.footer-brand__archive{
  margin-top:12px;
  max-width:34ch;
  font-size:13.5px;
  line-height:1.7;
  color:#7B93A4;
}
.footer-cols{
  display:grid;
  gap:clamp(20px,3vw,36px);
  grid-template-columns:repeat(3,minmax(0,1fr));
}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--white-100);
}
.footer-col__title::before{
  content:"";
  display:block;
  width:22px;height:2px;
  margin-bottom:11px;
  border-radius:2px;
  background:var(--green-600);
}
.footer-col__list{display:grid;gap:9px}
.footer-col__list li{font-size:14px;line-height:1.6}
.footer-col__list a{
  position:relative;
  color:var(--gray-400);
  transition:color var(--t-fast),padding-left var(--t-fast);
}
.footer-col__list a:hover{color:var(--green-400);padding-left:6px}
.footer-col__list--text{color:#7B93A4;font-size:13.5px}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px 24px;
  padding-block:18px 26px;
  border-top:1px solid rgba(20,64,95,.7);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:#6C8598;
}
.footer-litrail{
  height:2px;
  background:linear-gradient(90deg,rgba(4,16,27,0),rgba(31,163,122,.55),rgba(232,163,61,.45),rgba(4,16,27,0));
  background-size:200% 100%;
  animation:litrail 9s linear infinite;
}
@keyframes litrail{
  from{background-position:0% 0}
  to{background-position:200% 0}
}

/* ---------- 19. 显现 ---------- */
.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity var(--t-slow),transform var(--t-slow);
}
.js-ready [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 20. 响应式 ---------- */
@media (max-width:1240px){
  .header-note{display:none}
}
@media (max-width:1180px){
  .rail{display:none}
}
@media (max-width:900px){
  .grid--7-5,
  .grid--5-7,
  .grid--4-8{grid-template-columns:minmax(0,1fr)}
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:980px){
  .header-inner{min-height:62px}
  .nav-toggle{display:inline-flex}
  .header-cta{margin-left:0}
  .nav{
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:95;
    margin:0;
    align-items:center;
    gap:8px;
    padding:10px 14px calc(10px + env(safe-area-inset-bottom,0px));
    background:var(--ink-50);
    border:0;
    border-top:1px solid var(--deep-500);
    overflow-x:auto;
    overflow-y:hidden;
    scrollbar-width:none;
    -webkit-overflow-scrolling:touch;
  }
  .nav::-webkit-scrollbar{display:none}
  .nav__link{
    flex:0 0 auto;
    height:40px;
    padding:0 16px;
    font-size:13.5px;
    color:var(--text-soft);
    background:var(--deep-700);
    border-color:var(--deep-500);
  }
  .nav__link:hover{background:#102F4A;color:var(--white-100)}
  .nav__link[aria-current="page"]{
    background:var(--green-600);
    border-color:var(--green-600);
    color:var(--ink-50);
    font-weight:600;
  }
  .nav__link[aria-current="page"]::after{display:none}
  .nav[data-open="true"]{
    flex-wrap:wrap;
    justify-content:center;
    overflow:visible;
    padding-bottom:calc(16px + env(safe-area-inset-bottom,0px));
    box-shadow:0 -24px 44px -30px rgba(0,0,0,.95);
  }
  .nav[data-open="true"] .nav__link{
    flex:1 1 calc(50% - 8px);
    justify-content:center;
    min-width:0;
  }
  body{padding-bottom:84px}
  .footer-litrail{margin-bottom:0}
}
@media (max-width:860px){
  .pathway__node::after{display:none}
}
@media (max-width:620px){
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .footer-legal{flex-direction:column;gap:6px}
}
@media (max-width:560px){
  .header-cta{display:none}
  .brand__line{display:none}
}

/* ---------- 21. 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;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
  .footer-litrail{animation:none}
  .scroll-meter{transition:none}
}