/* ============================================================
   十博10指南 · 共享站点样式  /assets/site.css
   夜间仪表盘基底 + 奶油纸内容层 + 信号橙/荧光青状态色
   ============================================================ */

/* ---------- 1. RESET ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:28px;
}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,dl,dd,figure,blockquote{margin:0;padding:0;}
ul,ol{list-style:none;}
img,picture,svg,video,canvas{display:block;max-width:100%;height:auto;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}

/* ---------- 2. TOKENS ---------- */
:root{
  /* 品牌色 */
  --ink:#0B1B2B;
  --ink-deep:#071320;
  --ink-soft:#122A3E;
  --paper:#F4EBDD;
  --brown:#1E1714;
  --orange:#FF6B35;
  --cyan:#35F0D0;
  --mist:#8FA3B8;
  --glass:#223A4E;
  --mint:#CFE8E4;
  --alert:#D94A3A;

  /* 结构色 */
  --line-dark:rgba(143,163,184,.26);
  --line-dark-soft:rgba(143,163,184,.16);
  --line-paper:rgba(30,23,20,.18);
  --glass-fill:rgba(34,58,78,.48);
  --glass-fill-strong:rgba(34,58,78,.66);
  --on-orange:#1B0E07;
  --on-cyan:#04241F;

  /* 字体 */
  --font-display:"Helvetica Neue","Arial Narrow",Impact,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;

  /* 间距与尺寸 */
  --sp-1:4px; --sp-2:8px; --sp-3:12px; --sp-4:16px; --sp-5:24px;
  --sp-6:32px; --sp-7:48px; --sp-8:64px; --sp-9:96px;
  --w-max:1240px;
  --w-wide:1440px;
  --w-narrow:860px;
  --w-text:68ch;
  --radius:2px;
  --radius-lg:4px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. BASE ---------- */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 560px at 12% -12%, rgba(53,240,208,.09), transparent 62%),
    radial-gradient(900px 520px at 102% -4%, rgba(255,107,53,.10), transparent 58%);
  background-repeat:no-repeat;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{font-weight:800;line-height:1.15;letter-spacing:-.01em;}
strong{font-weight:700;}
::selection{background:var(--orange);color:var(--on-orange);}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:var(--radius);}
.surface-paper :focus-visible{outline-color:var(--orange);}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em;}
.eyebrow{
  display:inline-block;
  font:600 11px/1.4 var(--font-mono);
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--orange);
}
.rule{height:1px;border:0;background:var(--line-dark);margin:var(--sp-6) 0;}

/* ---------- 4. SKIP LINK ---------- */
.skip-link{
  position:fixed;
  top:0;left:50%;
  transform:translate(-50%,-160%);
  z-index:140;
  padding:12px 24px;
  background:var(--cyan);
  color:var(--on-cyan);
  font:600 14px/1 var(--font-body);
  letter-spacing:.08em;
  border-radius:0 0 var(--radius-lg) var(--radius-lg);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0);outline:none;}

/* ---------- 5. SCROLL PROGRESS ---------- */
.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:3px;
  background:rgba(143,163,184,.14);
  z-index:120;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:0%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  box-shadow:0 0 10px rgba(53,240,208,.5);
}

/* ---------- 6. HEADER ---------- */
.site-header{
  position:relative;
  z-index:60;
  background:rgba(11,27,43,.96);
  border-bottom:1px solid var(--line-dark);
}

/* 6.1 状态条 */
.header-strip{background:var(--ink-deep);border-bottom:1px solid var(--line-dark-soft);}
.header-strip__inner{
  max-width:var(--w-max);
  margin:0 auto;
  padding:0 24px;
  min-height:36px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--sp-5);
}
.header-strip__item{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font:500 11px/1.5 var(--font-mono);
  letter-spacing:.14em;
  color:var(--mist);
  white-space:nowrap;
}
.status-dot{
  width:7px;height:7px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,240,208,.16);
  animation:status-pulse 2.8s var(--ease) infinite;
}
@keyframes status-pulse{
  0%,100%{opacity:1;box-shadow:0 0 0 3px rgba(53,240,208,.16);}
  50%{opacity:.6;box-shadow:0 0 0 6px rgba(53,240,208,.05);}
}
.header-strip__cta{
  font:600 11px/1.5 var(--font-mono);
  letter-spacing:.16em;
  color:var(--orange);
  border-bottom:1px solid rgba(255,107,53,.45);
  padding-bottom:2px;
  transition:color .18s var(--ease),border-color .18s var(--ease);
  white-space:nowrap;
}
.header-strip__cta:hover{color:var(--cyan);border-color:var(--cyan);}

/* 6.2 刊头 */
.masthead{
  padding:30px 24px 26px;
  background:linear-gradient(180deg,rgba(34,58,78,.55),rgba(11,27,43,0) 92%);
  border-bottom:1px solid var(--line-dark);
}
.masthead__inner{
  position:relative;
  max-width:var(--w-max);
  margin:0 auto;
  display:flex;
  justify-content:center;
  align-items:center;
}
.masthead__annotation{
  position:absolute;
  top:50%;
  left:0;
  transform:translateY(-50%);
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font:500 11px/1 var(--font-mono);
  letter-spacing:.34em;
  color:var(--mist);
  opacity:.75;
  display:none;
}
.masthead__annotation--end{left:auto;right:0;color:var(--orange);opacity:.7;}
.brand{
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  gap:10px;
  text-align:center;
}
.brand__mark{
  position:relative;
  display:inline-block;
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(31px,5.4vw,58px);
  line-height:.98;
  letter-spacing:.01em;
  color:var(--paper);
}
.brand__mark::after{
  content:"";
  position:absolute;
  left:2%;right:2%;bottom:-7px;
  height:3px;
  background:linear-gradient(90deg,var(--orange),var(--orange) 62%,var(--cyan));
}
.brand__descriptor{
  margin-top:6px;
  font:500 11px/1.5 var(--font-mono);
  letter-spacing:.28em;
  color:var(--mist);
}
.brand:hover .brand__mark{color:#fff;}
.brand:hover .brand__descriptor{color:var(--cyan);}

/* 6.3 导航条 */
.nav-bar{
  background:linear-gradient(180deg,rgba(18,42,62,.82),rgba(11,27,43,.94));
  border-bottom:1px solid var(--line-dark);
}
.nav-bar__inner{
  position:relative;
  max-width:var(--w-max);
  margin:0 auto;
  padding:0 24px;
  min-height:54px;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:var(--sp-3);
}
.site-nav{width:100%;}
.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:2px;
}
.site-nav__link{
  position:relative;
  display:block;
  padding:15px 17px;
  font-size:15px;
  font-weight:500;
  letter-spacing:.05em;
  color:var(--paper);
  border-radius:var(--radius);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:17px;right:17px;bottom:9px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease);
}
.site-nav__link:hover{color:var(--cyan);}
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after{transform:scaleX(1);}
.site-nav__link[aria-current="page"]{
  color:var(--on-orange);
  background:var(--orange);
  font-weight:600;
}
.site-nav__link[aria-current="page"]::after{display:none;}

/* 6.4 移动菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid var(--line-dark);
  border-radius:var(--radius);
  color:var(--paper);
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle__label{
  font:600 12px/1 var(--font-mono);
  letter-spacing:.18em;
}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:space-between;
  width:18px;height:12px;
}
.nav-toggle__bars span{
  display:block;
  height:2px;
  width:100%;
  background:currentColor;
  transition:transform .22s var(--ease),opacity .18s var(--ease);
}
.site-header[data-open] .nav-toggle{
  color:var(--cyan);
  border-color:var(--cyan);
  background:rgba(53,240,208,.08);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* ---------- 7. CONTAINERS & LAYOUT ---------- */
.container{
  width:100%;
  max-width:var(--w-max);
  margin:0 auto;
  padding:0 24px;
}
.container--wide{max-width:var(--w-wide);}
.container--narrow{max-width:var(--w-narrow);}
.container--text{max-width:var(--w-text);}
.section{padding:var(--sp-8) 0;}
.section--tight{padding:var(--sp-6) 0;}

.surface-paper{background:var(--paper);color:var(--brown);}
.surface-glass{
  background:var(--glass-fill);
  border:1px solid var(--line-dark);
  backdrop-filter:blur(10px) saturate(140%);
  -webkit-backdrop-filter:blur(10px) saturate(140%);
  color:var(--paper);
}
.surface-ink{background:var(--ink-deep);color:var(--paper);}

.grid{display:grid;gap:var(--sp-5);}
.grid--split{grid-template-columns:minmax(0,1fr) minmax(0,1.35fr);}
.grid--asym{grid-template-columns:minmax(0,.85fr) minmax(0,2fr);}
.grid--cards{grid-template-columns:repeat(auto-fit,minmax(258px,1fr));}

/* ---------- 8. SECTION HEAD ---------- */
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:var(--sp-4);
  padding-bottom:14px;
  margin-bottom:var(--sp-6);
  border-bottom:1px solid var(--line-dark);
}
.surface-paper .section-head{border-bottom-color:var(--line-paper);}
.section-head__title{
  font-family:var(--font-display);
  font-size:clamp(23px,3vw,34px);
  font-weight:800;
  line-height:1.1;
  letter-spacing:.01em;
}
.section-head__index{
  font:600 12px/1 var(--font-mono);
  letter-spacing:.22em;
  color:var(--orange);
}

/* ---------- 9. BUTTONS ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:var(--radius);
  font:600 14px/1.2 var(--font-body);
  letter-spacing:.06em;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{transform:translateY(-1px);}
.btn--primary{background:var(--orange);border-color:var(--orange);color:var(--on-orange);}
.btn--primary:hover{background:var(--cyan);border-color:var(--cyan);color:var(--on-cyan);}
.btn--ghost{background:transparent;border-color:rgba(244,235,221,.36);color:var(--paper);}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);}
.btn--paper{background:var(--paper);border-color:var(--paper);color:var(--brown);}
.btn--paper:hover{background:var(--orange);border-color:var(--orange);color:var(--on-orange);}

/* ---------- 10. BREADCRUMB ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font:500 12px/1.6 var(--font-mono);
  letter-spacing:.06em;
  color:var(--mist);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb__link{
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.breadcrumb__link:hover{color:var(--cyan);border-bottom-color:var(--cyan);}
.breadcrumb__sep{color:rgba(143,163,184,.45);}
.breadcrumb__current{color:var(--paper);}

/* ---------- 11. TAG ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border-radius:999px;
  border:1px solid rgba(207,232,228,.3);
  background:rgba(207,232,228,.14);
  color:var(--mint);
  font:600 11px/1.6 var(--font-mono);
  letter-spacing:.1em;
  white-space:nowrap;
}
.tag--orange{background:rgba(255,107,53,.14);border-color:rgba(255,107,53,.42);color:#FFB79A;}
.tag--cyan{background:rgba(53,240,208,.12);border-color:rgba(53,240,208,.42);color:var(--cyan);}
.tag--alert{background:rgba(217,74,58,.16);border-color:rgba(217,74,58,.48);color:#F2A79E;}

/* ---------- 12. CARD ---------- */
.card{
  position:relative;
  padding:var(--sp-5);
  background:var(--glass-fill);
  border:1px solid var(--line-dark);
  border-radius:var(--radius);
  transition:border-color .2s var(--ease),background-color .2s var(--ease),transform .2s var(--ease);
}
.card:hover{
  border-color:rgba(53,240,208,.5);
  background:var(--glass-fill-strong);
  transform:translateY(-2px);
}
.card__label{
  display:block;
  font:600 11px/1.4 var(--font-mono);
  letter-spacing:.2em;
  color:var(--orange);
}
.card__title{
  margin-top:10px;
  font-family:var(--font-display);
  font-size:22px;
  font-weight:800;
  line-height:1.28;
}
.card__body{
  margin-top:10px;
  font-size:15px;
  line-height:1.72;
  color:var(--mist);
}
.surface-paper .card{
  background:rgba(255,255,255,.55);
  border-color:var(--line-paper);
  color:var(--brown);
}
.surface-paper .card:hover{background:#fff;border-color:rgba(255,107,53,.5);}
.surface-paper .card__body{color:rgba(30,23,20,.72);}

/* ---------- 13. FIGURE / 图片容器 ---------- */
.figure{display:flex;flex-direction:column;gap:10px;margin:0;}
.figure__frame{
  position:relative;
  overflow:hidden;
  width:100%;
  aspect-ratio:16/10;
  border:1px solid var(--line-dark);
  border-radius:var(--radius);
  background-color:var(--ink-soft);
  background-image:
    linear-gradient(to right,rgba(143,163,184,.16) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(143,163,184,.16) 1px,transparent 1px);
  background-size:32px 32px;
}
.figure__frame::after{
  content:"";
  position:absolute;
  inset:10px;
  border:1px solid rgba(53,240,208,.20);
  pointer-events:none;
  transition:border-color .2s var(--ease);
}
.figure:hover .figure__frame::after{border-color:rgba(255,107,53,.5);}
.figure__frame--tall{aspect-ratio:4/5;}
.figure__frame--square{aspect-ratio:1/1;}
.figure__frame--wide{aspect-ratio:21/9;}
.figure__img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.figure__caption{
  font:500 12px/1.6 var(--font-mono);
  letter-spacing:.05em;
  color:var(--mist);
}
.surface-paper .figure__frame{border-color:var(--line-paper);background-color:rgba(30,23,20,.06);}
.surface-paper .figure__caption{color:rgba(30,23,20,.62);}

/* ---------- 14. COPY CHIP ---------- */
.copy-chip{
  display:inline-flex;
  align-items:center;
  gap:10px;
  max-width:100%;
  padding:7px 11px;
  border:1px solid rgba(143,163,184,.34);
  border-radius:var(--radius);
  background:rgba(244,235,221,.06);
  color:var(--paper);
  font:500 13px/1.5 var(--font-mono);
  text-align:left;
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),background-color .18s var(--ease);
}
.copy-chip:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(53,240,208,.08);}
.copy-chip__value{overflow-wrap:anywhere;}
.copy-chip__hint{
  flex:none;
  padding-left:10px;
  border-left:1px solid rgba(143,163,184,.34);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--mist);
  transition:color .18s var(--ease);
}
.copy-chip[data-copied]{border-color:var(--cyan);color:var(--cyan);}
.copy-chip[data-copied] .copy-chip__hint{color:var(--cyan);}

/* ---------- 15. PROSE ---------- */
.prose{
  max-width:var(--w-text);
  font-size:17px;
  line-height:1.8;
  color:inherit;
}
.prose p + p{margin-top:1em;}
.prose h2,.prose h3{
  font-family:var(--font-display);
  letter-spacing:.01em;
  line-height:1.28;
  margin:1.9em 0 .55em;
}
.prose h2{font-size:clamp(22px,2.6vw,28px);}
.prose h3{font-size:19px;}
.prose h2:first-child,.prose h3:first-child{margin-top:0;}
.prose ul,.prose ol{margin:1em 0;padding-left:1.25em;}
.prose ul li{list-style:none;position:relative;padding-left:14px;}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;top:.72em;
  width:6px;height:6px;
  background:var(--orange);
}
.prose ol{list-style:decimal;}
.prose ol li{padding-left:4px;margin-bottom:.4em;}
.prose ol li::marker{color:var(--orange);font-family:var(--font-mono);}
.prose a{
  color:inherit;
  border-bottom:1px solid var(--orange);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.prose a:hover{color:var(--orange);border-bottom-color:transparent;}
.prose strong{font-weight:700;}
.prose blockquote{
  margin:1.4em 0;
  padding:2px 0 2px 18px;
  border-left:3px solid var(--orange);
  color:var(--mist);
  font-size:16px;
}
.surface-paper .prose blockquote{color:rgba(30,23,20,.7);}

/* ---------- 16. REVEAL ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
  will-change:opacity,transform;
}
[data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 17. FOOTER ---------- */
.site-footer{
  position:relative;
  margin-top:0;
  background:var(--ink-deep);
  color:var(--paper);
  border-top:1px solid var(--line-dark);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:3px;
  background:linear-gradient(90deg,var(--orange),rgba(255,107,53,.15) 46%,var(--cyan));
}
.footer__inner{
  max-width:var(--w-max);
  margin:0 auto;
  padding:var(--sp-8) 24px 0;
}
.footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,1fr) minmax(0,1.15fr);
  gap:var(--sp-7) var(--sp-6);
  padding-bottom:var(--sp-7);
}
.footer__brand{display:flex;flex-direction:column;gap:14px;align-items:flex-start;}
.footer__brand-link{display:inline-flex;flex-direction:column;gap:6px;align-items:flex-start;}
.footer__brand-mark{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(26px,3.4vw,36px);
  line-height:1;
  color:var(--paper);
  transition:color .18s var(--ease);
}
.footer__brand-link:hover .footer__brand-mark{color:var(--cyan);}
.footer__brand-descriptor{
  font:500 11px/1.5 var(--font-mono);
  letter-spacing:.22em;
  color:var(--mist);
}
.footer__summary{
  font-size:14px;
  line-height:1.75;
  color:rgba(244,235,221,.78);
  max-width:34ch;
}
.footer__badge{
  display:inline-block;
  padding:5px 10px;
  border:1px dashed rgba(143,163,184,.42);
  border-radius:var(--radius);
  font:500 11px/1.6 var(--font-mono);
  letter-spacing:.1em;
  color:var(--mist);
}
.footer__groups{display:flex;gap:var(--sp-7);flex-wrap:wrap;}
.footer__group{min-width:104px;}
.footer__group-title{
  font:600 11px/1.6 var(--font-mono);
  letter-spacing:.22em;
  color:var(--orange);
  margin-bottom:14px;
}
.footer__links{display:flex;flex-direction:column;gap:10px;}
.footer__link{
  display:inline-block;
  font-size:14px;
  color:rgba(244,235,221,.86);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease),padding-left .18s var(--ease);
}
.footer__link:hover{color:var(--cyan);border-bottom-color:var(--cyan);padding-left:4px;}
.footer__contact{display:flex;flex-direction:column;gap:12px;}
.footer__contact-list{display:flex;flex-direction:column;gap:14px;}
.footer__contact-item{display:flex;flex-direction:column;gap:6px;align-items:flex-start;}
.footer__contact-label{
  font:500 11px/1.6 var(--font-mono);
  letter-spacing:.18em;
  color:var(--mist);
}
.footer__contact-text{
  font-size:14px;
  line-height:1.7;
  color:rgba(244,235,221,.86);
}
.footer__note{
  margin-top:4px;
  padding-left:12px;
  border-left:2px solid rgba(255,107,53,.55);
  font-size:13px;
  line-height:1.72;
  color:rgba(143,163,184,.95);
}
.footer__legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px var(--sp-5);
  padding:20px 0 26px;
  border-top:1px solid var(--line-dark-soft);
  font:500 12px/1.6 var(--font-mono);
  letter-spacing:.05em;
  color:var(--mist);
}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:18px;}
.footer__legal-link{
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer__legal-link:hover{color:var(--cyan);border-bottom-color:var(--cyan);}
.footer__icp{color:rgba(143,163,184,.9);}
.footer__copyright{color:rgba(143,163,184,.7);}

/* 17.1 返回顶部 */
.to-top{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:110;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 15px;
  border:1px solid var(--cyan);
  border-radius:var(--radius);
  background:rgba(11,27,43,.9);
  color:var(--cyan);
  cursor:pointer;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease),background-color .18s var(--ease),color .18s var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none;}
.to-top:hover{background:var(--cyan);color:var(--on-cyan);}
.to-top__arrow{font:600 14px/1 var(--font-mono);}
.to-top__text{font:600 11px/1 var(--font-mono);letter-spacing:.16em;}

/* ---------- 18. RESPONSIVE ---------- */
@media (min-width:1100px){
  .masthead__annotation{display:block;}
  .masthead__inner{padding:0 76px;}
}
@media (max-width:1040px){
  .footer__grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);}
  .footer__contact{grid-column:1 / -1;}
  .footer__summary{max-width:52ch;}
}
@media (max-width:900px){
  .grid--split,.grid--asym{grid-template-columns:minmax(0,1fr);}
  .section{padding:var(--sp-7) 0;}
  .header-strip__inner{justify-content:space-between;}
}
@media (max-width:860px){
  .nav-bar__inner{
    flex-wrap:wrap;
    justify-content:space-between;
    padding:10px 16px;
    min-height:0;
  }
  .nav-toggle{display:inline-flex;order:1;}
  .site-nav{
    order:3;
    flex:1 1 100%;
    display:none;
    width:100%;
    margin-top:10px;
    padding-top:8px;
    border-top:1px solid var(--line-dark);
  }
  .site-header[data-open] .site-nav{display:block;}
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
  }
  .site-nav__link{
    padding:14px 6px;
    font-size:16px;
    border-bottom:1px dashed rgba(143,163,184,.18);
    border-radius:0;
  }
  .site-nav__link::after{display:none;}
  .site-nav__link[aria-current="page"]{
    background:rgba(255,107,53,.16);
    color:var(--orange);
    border-left:3px solid var(--orange);
    padding-left:12px;
  }
  .masthead{padding:24px 16px 22px;}
  .brand__descriptor{letter-spacing:.18em;}
  .header-strip__inner{padding:0 16px;min-height:34px;}
  .header-strip__item{display:none;}
  .header-strip__item:first-child{display:inline-flex;}
  .container{padding:0 18px;}
  .footer__inner{padding:var(--sp-7) 18px 0;}
}
@media (max-width:700px){
  body{font-size:16px;}
  .footer__grid{grid-template-columns:minmax(0,1fr);gap:var(--sp-6);}
  .footer__groups{gap:var(--sp-6);justify-content:space-between;}
  .footer__legal{flex-direction:column;align-items:flex-start;gap:12px;}
  .footer__summary{max-width:none;}
  .section-head{align-items:flex-start;}
  .copy-chip{font-size:12px;padding:6px 9px;}
}
@media (max-width:480px){
  .brand__mark{font-size:clamp(26px,9vw,34px);}
  .brand__descriptor{font-size:10px;letter-spacing:.12em;}
  .header-strip__cta{font-size:10px;letter-spacing:.1em;}
  .to-top{right:12px;bottom:12px;padding:10px 12px;}
}

/* ---------- 19. MOTION PREFERENCES ---------- */
@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;
  }
  [data-reveal]{opacity:1;transform:none;}
  .card:hover,.btn:hover{transform:none;}
  .to-top{transform:none;}
}