/* ============================================================
   云开主站 · 共享样式 /assets/site.css
   母题：一个被拉长的分号「；」——上点暖橙，下点信号绿
   ============================================================ */

:root{
  --ink:#0B1B2B;
  --ink-2:#12293F;
  --ink-3:#1C3A56;
  --green:#2FE08A;
  --green-soft:#8CF3BC;
  --orange:#FF8A3D;
  --orange-soft:#FFC59B;
  --violet:#4A3D8E;
  --wine:#8C3556;
  --paper:#F3F6F8;
  --muted:#A9BCCB;
  --sand:#E8B77A;

  --wrap:1240px;
  --gutter:clamp(16px,4vw,40px);
  --radius:22px;
  --radius-sm:14px;
  --section-y:clamp(48px,7vw,96px);

  --font-display:"Oswald","Bebas Neue","Haettenschweiler","PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  background-color:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

/* 深底颗粒与珠宝色分区光晕 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.55;
  background-image:repeating-linear-gradient(0deg,rgba(255,255,255,.022) 0 1px,transparent 1px 3px);
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(900px 620px at 10% -12%,rgba(255,138,61,.11),transparent 62%),
    radial-gradient(820px 700px at 94% 6%,rgba(47,224,138,.10),transparent 64%),
    radial-gradient(760px 720px at 68% 104%,rgba(74,61,142,.16),transparent 62%);
}

img{max-width:100%;height:auto}

a{color:var(--green-soft);text-decoration:none}
a:hover{color:var(--paper)}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-display);
  font-weight:700;
  letter-spacing:-.01em;
  line-height:1.08;
  text-wrap:balance;
}

p{margin:0 0 1em;word-break:break-word}
ul,ol{margin:0 0 1em;padding-left:1.2em}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible{
  outline:2px solid var(--green-soft);
  outline-offset:3px;
  border-radius:6px;
}

/* ---------- 布局骨架 ---------- */

.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}

.section{padding-top:var(--section-y);padding-bottom:var(--section-y)}

.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))}

/* 分号式双栏：左 60% 暖橙阅读区 / 右 40% 信号绿轨道区 */
.split{
  display:grid;
  grid-template-columns:minmax(0,6fr) minmax(0,4fr);
  gap:clamp(24px,4vw,56px);
  align-items:start;
}
.split__aside{position:sticky;top:96px;align-self:start}
.rail-dock{position:sticky;top:96px;align-self:start}
html[data-rail="off"] .rail-dock{display:none}

/* ---------- 母题：分号 ---------- */

.semicolon{
  --dot:10px;
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  line-height:0;
}
.semicolon::before{
  content:"";
  width:var(--dot);
  height:var(--dot);
  border-radius:50%;
  background:linear-gradient(160deg,var(--orange),var(--orange-soft));
}
.semicolon::after{
  content:"";
  width:var(--dot);
  height:calc(var(--dot) * 1.9);
  border-radius:999px;
  background:linear-gradient(160deg,var(--green),var(--green-soft));
}

/* ---------- 文字层级 ---------- */

.eyebrow{
  margin:0 0 .6em;
  font-size:13px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--muted);
}
.display{
  font-family:var(--font-display);
  font-size:clamp(48px,9vw,96px);
  line-height:.95;
  letter-spacing:-.02em;
  font-stretch:condensed;
  margin:0;
}
.text-muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ---------- 编号章节 ---------- */

.chapter{
  position:relative;
  padding:clamp(36px,6vw,72px) 0;
}
.chapter__number{
  position:absolute;
  top:0;
  right:0;
  z-index:0;
  pointer-events:none;
  user-select:none;
  font-family:var(--font-display);
  font-size:clamp(96px,18vw,180px);
  line-height:.78;
  font-weight:800;
  letter-spacing:-.04em;
  color:transparent;
  -webkit-text-stroke:1.5px var(--wine);
  opacity:.55;
}
.chapter__head{position:relative;z-index:1;max-width:30ch}
.chapter__title{
  margin:.3em 0 0;
  font-size:clamp(28px,4.4vw,48px);
  line-height:1.05;
}
.chapter__body{position:relative;z-index:1;margin-top:clamp(18px,3vw,32px)}

/* ---------- 黏性章节目录 ---------- */

.chapter-index{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.chapter-index__link{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:9px 12px;
  border-radius:12px;
  color:var(--muted);
  font-size:13px;
  letter-spacing:.08em;
  transition:background .24s ease,color .24s ease,box-shadow .24s ease;
}
.chapter-index__link:hover{
  background:var(--ink-2);
  color:var(--paper);
}
.chapter-index__link[aria-current="true"]{
  background:rgba(47,224,138,.1);
  color:var(--green-soft);
  box-shadow:inset 2px 0 0 var(--green);
}
.chapter-index__num{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--orange-soft);
}

/* ---------- 横向轨道 ---------- */

.rail{
  display:flex;
  gap:14px;
  overflow-x:auto;
  padding:6px 4px 14px;
  scroll-snap-type:x proximity;
  scrollbar-width:thin;
  scrollbar-color:var(--ink-3) transparent;
  -webkit-overflow-scrolling:touch;
}
.rail::-webkit-scrollbar{height:6px}
.rail::-webkit-scrollbar-thumb{background:var(--ink-3);border-radius:999px}
.rail::-webkit-scrollbar-track{background:transparent}

.rail__item{
  flex:0 0 auto;
  scroll-snap-align:start;
  min-width:184px;
  padding:16px 18px;
  border-radius:var(--radius-sm);
  background:var(--ink-2);
  border:1px solid var(--ink-3);
  color:var(--paper);
  transition:transform .24s ease,border-color .24s ease,background .24s ease;
}
.rail__item:hover,
.rail__item[aria-current="true"]{
  border-color:var(--green);
  background:rgba(47,224,138,.08);
  transform:scale(1.04);
  color:var(--paper);
}

/* ---------- 卡片与标签 ---------- */

.card{
  position:relative;
  padding:clamp(20px,3vw,32px);
  border-radius:var(--radius);
  background:var(--ink-2);
  border:1px solid var(--ink-3);
}
.card--warm{border-color:rgba(255,138,61,.32);background:linear-gradient(180deg,rgba(255,138,61,.07),rgba(18,41,63,0) 55%),var(--ink-2)}
.card--cool{border-color:rgba(47,224,138,.28);background:linear-gradient(180deg,rgba(47,224,138,.07),rgba(18,41,63,0) 55%),var(--ink-2)}
.card__label{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0 0 .7em;
  font-size:13px;
  letter-spacing:.16em;
  color:var(--muted);
}
.card__title{
  margin:0 0 .5em;
  font-size:clamp(20px,2.4vw,28px);
}
.card__meta{
  margin:.9em 0 0;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--muted);
}

.pill{
  display:inline-flex;
  align-items:center;
  gap:.45em;
  padding:.38em .85em;
  border-radius:999px;
  border:1px solid var(--ink-3);
  color:var(--muted);
  font-size:13px;
  letter-spacing:.08em;
  line-height:1.4;
  text-decoration:none;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.pill:hover{color:var(--paper);border-color:var(--muted)}
.pill--orange{
  color:var(--orange-soft);
  border-color:rgba(255,138,61,.45);
  background:rgba(255,138,61,.1);
}
.pill--orange:hover{background:rgba(255,138,61,.2);color:var(--paper)}
.pill--green{
  color:var(--green-soft);
  border-color:rgba(47,224,138,.4);
  background:rgba(47,224,138,.1);
}
.pill--green:hover{background:rgba(47,224,138,.2);color:var(--paper)}

/* ---------- 按钮 ---------- */

.btn{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.82em 1.5em;
  border-radius:999px;
  border:1px solid transparent;
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  text-decoration:none;
  transition:transform .2s ease,background .2s ease,color .2s ease,border-color .2s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn--orange{background:var(--orange);color:#08131F}
.btn--orange:hover{background:var(--orange-soft);color:#08131F}
.btn--green{background:var(--green);color:#08131F}
.btn--green:hover{background:var(--green-soft);color:#08131F}
.btn--ghost{border-color:rgba(243,246,248,.28);color:var(--paper)}
.btn--ghost:hover{border-color:var(--orange);color:var(--orange-soft)}

/* ---------- 状态点 ---------- */

.status-dot{
  flex:0 0 auto;
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 4px rgba(47,224,138,.15);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:1}
  50%{opacity:.4}
}

/* ---------- 图片容器基础规则 ---------- */

.media{
  position:relative;
  display:block;
  margin:0;
  overflow:hidden;
  border-radius:var(--radius);
  background:var(--ink-2);
  border:1px solid var(--ink-3);
  isolation:isolate;
}
.media > img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.72) contrast(1.06) brightness(.85);
  transition:transform .6s ease;
}
.media:hover > img{transform:scale(1.02)}
.media--wide{aspect-ratio:16 / 9}
.media--tall{aspect-ratio:4 / 5}
.media--square{aspect-ratio:1 / 1}
.media--flush-tr{border-top-right-radius:0}
.media--grain::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  mix-blend-mode:overlay;
  background-image:repeating-linear-gradient(115deg,rgba(255,255,255,.06) 0 1px,transparent 1px 4px);
}
.media__caption{
  position:absolute;
  left:12px;
  right:12px;
  bottom:12px;
  margin:0;
  padding:6px 12px;
  border-radius:999px;
  background:rgba(11,27,43,.74);
  color:var(--paper);
  font-size:13px;
  letter-spacing:.04em;
}

/* ---------- 面包屑与正文 ---------- */

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:.5em;
  margin:0 0 clamp(16px,3vw,28px);
  padding:0;
  list-style:none;
  font-size:13px;
  letter-spacing:.1em;
  color:var(--muted);
}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--orange-soft)}
.breadcrumb li + li::before{content:"；";color:var(--ink-3);margin-right:.5em}

.prose{
  max-width:40em;
  font-size:17px;
  line-height:1.75;
  color:var(--paper);
}
.prose h2{margin:1.6em 0 .5em;font-size:clamp(24px,3vw,32px)}
.prose h3{margin:1.4em 0 .4em;font-size:20px}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin:.35em 0}
.prose a{border-bottom:1px solid rgba(140,243,188,.45)}
.prose blockquote{
  margin:1.4em 0;
  padding:.2em 0 .2em 1.1em;
  border-left:3px solid var(--wine);
  color:var(--muted);
}

/* ---------- 显现动画 ---------- */

[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s ease,transform .5s ease;
}
[data-reveal][data-revealed="true"]{
  opacity:1;
  transform:none;
}

/* ---------- 滚动进度与返回顶部 ---------- */

.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  z-index:90;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--orange),var(--green));
  pointer-events:none;
}

.to-top{
  position:fixed;
  right:clamp(16px,3vw,32px);
  bottom:clamp(16px,3vw,32px);
  z-index:80;
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  padding:0;
  border-radius:50%;
  border:1px solid var(--ink-3);
  background:var(--ink-2);
  color:var(--paper);
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transition:opacity .24s ease,visibility .24s ease,transform .24s ease,border-color .24s ease;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible}
.to-top:hover{border-color:var(--green);color:var(--green-soft);transform:translateY(-3px)}
.to-top__arrow{font-size:18px;line-height:1}

/* ---------- 头部 ---------- */

.site-header{position:relative;z-index:60;background:var(--ink)}

.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-120px;
  z-index:120;
  padding:.6em 1.1em;
  border-radius:0 0 12px 12px;
  background:var(--green);
  color:#08131F;
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  transition:top .2s ease;
}
.skip-link:focus{top:0;color:#08131F}

.ticker{
  background:
    linear-gradient(90deg,rgba(255,138,61,.16),rgba(255,138,61,0) 44%),
    var(--ink-3);
  border-bottom:1px solid rgba(243,246,248,.06);
}
.ticker__inner{
  display:flex;
  align-items:center;
  gap:14px;
  min-height:40px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--muted);
}
.ticker__label{
  display:flex;
  align-items:center;
  gap:8px;
  margin:0;
  white-space:nowrap;
  color:var(--paper);
}
.ticker__sep{
  color:var(--orange);
  font-size:16px;
  line-height:1;
}
.ticker__clock{
  display:flex;
  align-items:baseline;
  gap:6px;
  margin:0;
  color:var(--green-soft);
}
.ticker__num{
  display:inline-block;
  min-width:5ch;
  text-align:center;
  font-family:var(--font-mono);
  font-size:15px;
  font-weight:600;
  letter-spacing:.04em;
  font-variant-numeric:tabular-nums;
}
.ticker__unit{
  font-size:12px;
  letter-spacing:.16em;
  color:var(--muted);
}
.ticker__note{
  margin:0 0 0 auto;
  color:var(--muted);
  opacity:.9;
}

.brandbar{
  background:var(--ink);
  border-bottom:1px solid var(--ink-3);
}
.brandbar__inner{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:clamp(12px,3vw,32px);
  max-width:var(--wrap);
  margin:0 auto;
  padding:15px var(--gutter);
}
.brand{
  display:inline-flex;
  align-items:baseline;
  gap:10px;
  color:var(--paper);
  text-decoration:none;
}
.brand:hover{color:var(--paper)}
.brand__mark{
  font-family:var(--font-display);
  font-size:28px;
  line-height:1;
  color:var(--orange);
  transform:translateY(2px);
}
.brand__text{
  font-family:var(--font-display);
  font-size:26px;
  font-weight:700;
  letter-spacing:.02em;
}
.brand__sub{
  margin-left:8px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:400;
  letter-spacing:.28em;
  color:var(--muted);
}
.brandbar__note{
  margin:0;
  font-size:13px;
  letter-spacing:.1em;
  color:var(--muted);
}
.brandbar__actions{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:10px;
}

.nav{
  position:sticky;
  top:0;
  z-index:70;
  background:rgba(18,41,63,.92);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--ink-3);
}
.nav__inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:18px;
  min-height:56px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}
.nav__list{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,28px);
  margin:0;
  padding:0;
  list-style:none;
}
.nav__link{
  position:relative;
  display:inline-block;
  padding:17px 2px 15px;
  color:var(--muted);
  font-size:15px;
  letter-spacing:.04em;
  text-decoration:none;
  transition:color .2s ease;
}
.nav__link:hover{color:var(--paper)}
.nav__link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:9px;
  height:2px;
  border-radius:2px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .24s ease;
}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{
  color:var(--paper);
  font-weight:600;
}
.nav__link[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--green);
}

.nav__toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:8px 13px;
  border-radius:999px;
  border:1px solid var(--ink-3);
  background:transparent;
  color:var(--paper);
  font:inherit;
  font-size:14px;
  cursor:pointer;
}
.nav__toggle-bars{
  position:relative;
  display:inline-block;
  width:16px;
  height:10px;
}
.nav__toggle-bars::before,
.nav__toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:1.5px;
  border-radius:2px;
  background:currentColor;
  transition:transform .2s ease;
}
.nav__toggle-bars::before{top:0}
.nav__toggle-bars::after{bottom:0}
.nav__toggle[aria-expanded="true"] .nav__toggle-bars::before{transform:translateY(4px) rotate(45deg)}
.nav__toggle[aria-expanded="true"] .nav__toggle-bars::after{transform:translateY(-4.5px) rotate(-45deg)}

.nav__rail-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:7px 13px;
  border-radius:999px;
  border:1px solid rgba(47,224,138,.35);
  background:rgba(47,224,138,.08);
  color:var(--green-soft);
  font:inherit;
  font-size:13px;
  letter-spacing:.08em;
  cursor:pointer;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.nav__rail-toggle:hover{background:rgba(47,224,138,.18);color:var(--paper)}
.nav__rail-toggle[aria-pressed="true"]{
  background:var(--green);
  border-color:var(--green);
  color:#08131F;
}
.nav__rail-bars{
  width:14px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  box-shadow:0 -4px 0 currentColor,0 4px 0 currentColor;
}

/* ---------- 页脚 ---------- */

.site-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--ink-2);
  border-top:1px solid var(--ink-3);
  color:var(--muted);
}
.footer__inner{
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(40px,6vw,72px) var(--gutter) 24px;
}
.footer__grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.3fr;
  gap:clamp(24px,4vw,48px);
}
.footer__col{min-width:0}
.footer__col--brand .footer__title{
  font-size:20px;
  color:var(--paper);
}
.footer__title{
  margin:0 0 14px;
  font-family:var(--font-display);
  font-size:14px;
  letter-spacing:.16em;
  color:var(--paper);
}
.footer__note{
  margin:0 0 12px;
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}
.footer__meta{
  margin:0;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--sand);
}
.footer__list{
  margin:0;
  padding:0;
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:10px;
  font-size:14px;
  line-height:1.55;
}
.footer__list li{color:var(--muted)}
.footer__link{
  color:var(--paper);
  text-decoration:none;
  border-bottom:1px solid rgba(243,246,248,.16);
  transition:color .2s ease,border-color .2s ease;
}
.footer__link:hover{color:var(--green-soft);border-color:var(--green-soft)}
.footer__value{
  display:block;
  margin-top:2px;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--orange-soft);
  word-break:break-all;
  line-height:1.6;
}
.footer__bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:14px;
  margin-top:clamp(28px,5vw,48px);
  padding-top:18px;
  border-top:1px solid var(--ink-3);
  font-size:13px;
  letter-spacing:.08em;
}
.footer__icp{margin:0;color:var(--muted);font-family:var(--font-mono)}
.footer__copy{margin:0;color:var(--muted)}
.footer__region{
  flex:0 0 auto;
  width:min(20%,120px);
  height:6px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--sand),rgba(232,183,122,0));
}

/* ---------- 响应式 ---------- */

@media (max-width:1024px){
  .split{grid-template-columns:minmax(0,1fr)}
  .split__aside,
  .rail-dock{position:static;top:auto}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:900px){
  body{font-size:16px}

  .nav__list{
    position:absolute;
    top:calc(100% + 8px);
    left:var(--gutter);
    right:var(--gutter);
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    max-height:70vh;
    overflow-y:auto;
    padding:8px;
    background:var(--ink-2);
    border:1px solid var(--ink-3);
    border-radius:var(--radius-sm);
    box-shadow:0 24px 48px rgba(0,0,0,.5);
  }
  .nav[data-open="true"] .nav__list{display:flex}
  .nav__toggle{display:inline-flex}
  .nav__link{
    padding:12px 12px;
    border-radius:10px;
    font-size:16px;
  }
  .nav__link::after{display:none}
  .nav__link:hover,
  .nav__link[aria-current="page"]{
    background:rgba(47,224,138,.1);
    color:var(--paper);
  }
  .nav__link[aria-current="page"]{box-shadow:inset 2px 0 0 var(--green)}

  .brandbar__note{display:none}
  .grid--2,
  .grid--3{grid-template-columns:minmax(0,1fr)}
  .chapter__number{opacity:.4}
}

@media (max-width:720px){
  .ticker__note{display:none}
  .brandbar__inner{padding:12px var(--gutter)}
  .brand__text{font-size:22px}
  .brand__mark{font-size:24px}
}

@media (max-width:620px){
  .footer__grid{grid-template-columns:minmax(0,1fr)}
  .footer__bottom{flex-direction:column;align-items:flex-start}
  .footer__region{width:120px}
  .to-top{width:42px;height:42px}
}

@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;transform:none}
  .media > img,
  .rail__item,
  .btn{transition:none}
  .media:hover > img{transform:none}
}