/* ============================================================
   乐天棋牌 · 规则档案室  /assets/site.css
   绒布墨绿底 · 暖金主线 · 朱砂点缀 · 米纸阅读层
   ============================================================ */

:root{
  --fabric:#0E2B23;
  --fabric-deep:#14382D;
  --card:#1B4A3C;
  --card-lift:#1F5343;
  --gold:#C9A227;
  --gold-bright:#E8C766;
  --cinnabar:#B23A2E;
  --cinnabar-soft:#E1908A;
  --paper:#F4EFE4;
  --ink:#12110F;
  --line:#8C8C86;
  --mist:#6F8B82;

  --text-soft:rgba(244,239,228,.80);
  --text-dim:rgba(244,239,228,.62);
  --hair:rgba(244,239,228,.13);
  --gold-hair:rgba(201,162,39,.38);

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-text:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"SFMono-Regular",ui-monospace,Menlo,Consolas,monospace;

  --wrap:1240px;
  --header-h:74px;
  --gap:clamp(14px,1.7vw,24px);
  --section-y:clamp(48px,7vw,98px);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 18px);
}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0}
ul[class],ol[class]{list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
img,svg,video{display:block;max-width:100%}
table{border-collapse:collapse}
[hidden]{display:none !important}

:where(a,button,input,select,textarea,[tabindex]):focus-visible{
  outline:2px solid var(--gold-bright);
  outline-offset:3px;
  border-radius:2px;
}

/* ---------- base ---------- */
body{
  font-family:var(--font-text);
  font-size:clamp(15.5px,1.02vw,17px);
  line-height:1.75;
  color:var(--text-soft);
  background-color:var(--fabric);
  background-image:radial-gradient(130% 95% at 50% -12%,#17453A 0%,var(--fabric) 52%,#091E18 100%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::after{
  content:"";
  position:fixed;inset:0;z-index:6;pointer-events:none;
  background-image:radial-gradient(rgba(244,239,228,.05) .5px,transparent .6px);
  background-size:3px 3px;
  opacity:.55;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.24;color:var(--paper);letter-spacing:.004em}
p{max-width:72ch}
strong,b{font-weight:600}

.display-1{font-family:var(--font-display);font-weight:700;font-size:clamp(38px,7vw,88px);line-height:1.04;letter-spacing:-.02em}
.display-2{font-family:var(--font-display);font-weight:700;font-size:clamp(28px,4.2vw,48px);line-height:1.12}
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:700;
  font-size:clamp(28px,4vw,44px);
  line-height:1;
  color:var(--gold-bright);
  letter-spacing:-.02em;
}
.link-gold{
  color:var(--gold-bright);
  border-bottom:1px solid var(--gold-hair);
  transition:color .2s ease,border-color .2s ease;
}
.link-gold:hover{color:var(--paper);border-bottom-color:var(--gold-bright)}

.wrap{width:min(100% - 40px,var(--wrap));margin-inline:auto}

.site-main{padding-top:var(--header-h)}
.site-main--flush{padding-top:0}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 18px;
  background:var(--gold);color:var(--ink);
  border:1px solid var(--ink);
  font-size:14px;font-weight:600;letter-spacing:.06em;
  transform:translateY(-220%);
  transition:transform .22s ease;
}
.skip-link:focus{transform:none}

/* ---------- header ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:80;
  color:var(--paper);
  background:linear-gradient(180deg,rgba(14,43,35,.95) 0%,rgba(14,43,35,.72) 62%,rgba(14,43,35,0) 100%);
  border-bottom:1px solid transparent;
  transition:background-color .35s ease,border-color .35s ease,box-shadow .35s ease;
}
.site-header[data-scrolled]{
  background:rgba(14,43,35,.975);
  border-bottom-color:var(--gold-hair);
  box-shadow:0 18px 40px -30px rgba(0,0,0,.95);
}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:linear-gradient(90deg,var(--gold),var(--gold-bright));
  transform:scaleX(0);transform-origin:0 50%;
  will-change:transform;
}
.site-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,1.8vw,32px);
  min-height:var(--header-h);
}

/* brand */
.brand{display:flex;align-items:center;gap:11px;flex:0 0 auto}
.brand__mark{
  display:grid;place-items:center;
  width:38px;height:38px;flex:0 0 38px;
  font-family:var(--font-display);font-size:19px;font-weight:700;color:var(--ink);
  background:linear-gradient(145deg,var(--gold-bright),var(--gold));
  border-radius:50%;
  box-shadow:0 0 0 3px rgba(201,162,39,.2),inset 0 0 0 2px rgba(18,17,15,.28);
  transform:rotate(-6deg);
  transition:transform .3s ease;
}
.brand:hover .brand__mark{transform:rotate(0deg) translateY(-1px)}
.brand__text{display:block;min-width:0}
.brand__line{
  display:block;
  font-family:var(--font-display);
  font-weight:700;font-size:16px;letter-spacing:.02em;color:var(--paper);
  white-space:nowrap;
}
.brand__sub{
  display:block;
  font-size:11.5px;letter-spacing:.08em;color:var(--mist);
  white-space:nowrap;
}

/* nav */
.nav{flex:1 1 auto;display:flex;justify-content:center}
.nav__list{display:flex;align-items:center;gap:clamp(4px,1vw,18px)}
.nav__link{
  position:relative;
  display:inline-block;
  padding:9px 2px;
  font-size:14.5px;
  letter-spacing:.02em;
  color:var(--text-dim);
  white-space:nowrap;
  transition:color .22s ease;
}
.nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:3px;height:1px;
  background:var(--gold);transform:scaleX(0);transform-origin:left;
  transition:transform .26s ease;
}
.nav__link:hover{color:var(--gold-bright)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--gold-bright)}
.nav__link[aria-current="page"]::after{transform:scaleX(1);height:2px}

/* header actions */
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.version-chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 11px;
  border:1px solid var(--gold-hair);
  border-radius:999px;
  background:rgba(201,162,39,.09);
  font-size:12px;letter-spacing:.06em;color:var(--gold-bright);
  font-variant-numeric:tabular-nums;
}
.version-chip__label{color:var(--mist);letter-spacing:.1em}

/* buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;
  border:1px solid var(--gold);
  border-radius:2px;
  font-size:15px;font-weight:500;letter-spacing:.06em;
  color:var(--gold-bright);
  background:transparent;
  cursor:pointer;
  transition:background-color .24s ease,color .24s ease,border-color .24s ease,transform .24s ease;
}
.btn:hover{background:var(--gold);color:var(--ink);border-color:var(--gold-bright);transform:translateY(-2px)}
.btn--gold{background:var(--gold);color:var(--ink);border-color:var(--gold-bright)}
.btn--gold:hover{background:var(--gold-bright);color:var(--ink)}
.btn--ghost{border-color:rgba(140,140,134,.55);color:var(--paper)}
.btn--ghost:hover{background:transparent;border-color:var(--gold);color:var(--gold-bright)}
.btn--paper{background:var(--paper);color:var(--ink);border-color:var(--ink)}
.btn--paper:hover{background:var(--gold-bright);border-color:var(--ink);color:var(--ink)}
.btn--sm{padding:8px 14px;font-size:13px;letter-spacing:.08em}

/* nav toggle */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;
  border:1px solid var(--gold-hair);
  border-radius:2px;
  color:var(--gold-bright);
  font-size:13px;letter-spacing:.1em;
  cursor:pointer;
  transition:background-color .24s ease,border-color .24s ease;
}
.nav-toggle:hover{background:rgba(201,162,39,.14);border-color:var(--gold)}
.nav-toggle__bars{position:relative;display:block;width:18px;height:12px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;
  transition:transform .26s ease,top .26s ease;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:10px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:5px;transform:rotate(-45deg)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,110px);
  background:var(--fabric-deep);
  border-top:1px solid var(--gold-hair);
  color:var(--text-dim);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:5px;
  background:repeating-linear-gradient(90deg,var(--gold) 0 16px,transparent 16px 34px);
  opacity:.42;
}
.site-footer__inner{padding:clamp(42px,6vw,74px) 0 26px}
.site-footer__grid{
  display:grid;
  grid-template-columns:1.5fr .85fr .85fr 1.35fr;
  gap:clamp(26px,3.6vw,52px);
}
.footer-brand .brand{margin-bottom:16px}
.footer-summary{
  font-size:14.5px;
  color:var(--text-dim);
  max-width:34ch;
}
.footer-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin-top:16px;
  font-size:12.5px;letter-spacing:.06em;color:var(--mist);
  font-variant-numeric:tabular-nums;
}
.footer-meta b{color:var(--gold-bright);font-family:var(--font-mono);font-size:14px}
.footer-col__title{
  font-family:var(--font-text);
  font-size:12.5px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;
  color:var(--gold);
  padding-bottom:12px;margin-bottom:14px;
  border-bottom:1px solid var(--hair);
}
.footer-col__list{display:flex;flex-direction:column;gap:9px}
.footer-link{
  font-size:14.5px;
  color:var(--text-dim);
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease,padding-left .2s ease;
}
.footer-link:hover{color:var(--gold-bright);border-bottom-color:var(--gold);padding-left:4px}
.footer-contact__list{gap:12px}
.footer-contact__item{display:flex;gap:10px;align-items:baseline;font-size:14.5px}
.footer-contact__key{
  flex:0 0 40px;
  font-size:12px;letter-spacing:.12em;color:var(--mist);
}
.footer-contact__val{color:var(--paper);word-break:break-all}
.footer-address{font-size:14px;line-height:1.6}
.footer-note{
  margin-top:14px;
  font-size:13px;line-height:1.7;color:var(--mist);max-width:32ch;
}
.site-footer__bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px 26px;
  margin-top:clamp(30px,4vw,52px);
  padding-top:20px;
  border-top:1px solid var(--hair);
  font-size:13px;color:var(--mist);
}
.footer-copy{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px;margin-inline:auto}
.footer-legal .footer-link{font-size:13px}
.footer-icp{margin:0;letter-spacing:.04em;font-variant-numeric:tabular-nums}

/* ---------- back to top ---------- */
.to-top{
  position:fixed;
  right:clamp(14px,2vw,30px);
  bottom:clamp(14px,2vw,30px);
  z-index:70;
  display:grid;place-items:center;
  width:46px;height:46px;
  border:1px solid var(--gold-hair);
  border-radius:50%;
  background:rgba(14,43,35,.92);
  color:var(--gold-bright);
  cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .28s ease,transform .28s ease,visibility .28s,background-color .24s ease;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--gold);color:var(--ink)}
.to-top__arrow{font-size:17px;line-height:1}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{margin-bottom:clamp(18px,2.4vw,30px)}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--mist)}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";color:rgba(140,140,134,.55)}
.breadcrumbs__link{color:var(--text-dim);border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.breadcrumbs__link:hover{color:var(--gold-bright);border-bottom-color:var(--gold)}
.breadcrumbs__item[aria-current="page"] .breadcrumbs__link{color:var(--paper);border-bottom-color:var(--gold-hair)}

/* ---------- sections ---------- */
.section{padding-block:var(--section-y)}
.section__head{max-width:64ch;margin-bottom:clamp(24px,3.4vw,44px)}
.section__eyebrow{
  display:block;margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--gold);
}
.section__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(25px,3.4vw,40px);
  line-height:1.2;
  letter-spacing:-.008em;
}
.section__lead{margin-top:14px;color:var(--text-dim)}

/* ---------- bento grid ---------- */
.bento{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.bento > *{grid-column:span 12}
@media (min-width:700px){
  .md-4{grid-column:span 4}
  .md-5{grid-column:span 5}
  .md-6{grid-column:span 6}
  .md-7{grid-column:span 7}
  .md-8{grid-column:span 8}
}
@media (min-width:1024px){
  .lg-3{grid-column:span 3}
  .lg-4{grid-column:span 4}
  .lg-5{grid-column:span 5}
  .lg-6{grid-column:span 6}
  .lg-7{grid-column:span 7}
  .lg-8{grid-column:span 8}
  .lg-9{grid-column:span 9}
  .lg-12{grid-column:span 12}
}

/* ---------- paper card ---------- */
.paper{
  position:relative;
  background:var(--paper);
  color:#26241F;
  border:1px solid var(--ink);
  padding:clamp(20px,2.6vw,36px);
  box-shadow:5px 5px 0 -1px rgba(201,162,39,.55),10px 10px 0 -2px rgba(244,239,228,.14);
}
.paper h1,.paper h2,.paper h3,.paper h4{color:var(--ink)}
.paper p{color:#3A3630}
.paper p + p{margin-top:.9em}
.paper .num{color:var(--ink)}
.paper a{color:#7A5F12;border-bottom:1px solid rgba(122,95,18,.4)}
.paper a:hover{color:var(--cinnabar);border-bottom-color:var(--cinnabar)}

/* ---------- rule card ---------- */
.rule-card{
  position:relative;
  display:flex;flex-direction:column;gap:14px;
  padding:clamp(18px,2.2vw,28px);
  background:var(--card);
  border:1px solid var(--hair);
  border-left:3px solid rgba(201,162,39,.55);
  transition:transform .25s ease,background-color .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.rule-card:hover{
  transform:translateY(-3px);
  background:var(--card-lift);
  border-color:rgba(201,162,39,.45);
  border-left-color:var(--gold);
}
.rule-card[data-anchor-state="active"]{
  border-left-color:var(--gold);
  background:var(--card-lift);
  box-shadow:inset 4px 0 0 var(--gold),0 0 0 1px var(--gold-hair);
}
.rule-card__no{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:13px;letter-spacing:.1em;
  color:var(--gold);
}
.rule-card__title{
  font-family:var(--font-display);
  font-size:clamp(19px,2vw,23px);
  font-weight:700;
  line-height:1.35;
  color:var(--paper);
}
.rule-card__body{font-size:15.5px;color:var(--text-dim)}
.rule-card__foot{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin-top:auto;padding-top:14px;
  border-top:1px solid var(--hair);
}

/* ---------- horizontal bar ---------- */
.bar{
  display:flex;flex-wrap:wrap;align-items:center;
  gap:clamp(14px,2.4vw,32px);
  padding:clamp(18px,2.4vw,30px);
  background:var(--fabric-deep);
  border:1px solid var(--gold-hair);
  border-left:4px solid var(--gold);
}
.bar--red{
  background:linear-gradient(90deg,rgba(178,58,46,.16),rgba(178,58,46,.04));
  border-color:rgba(178,58,46,.45);
  border-left-color:var(--cinnabar);
}
.bar__label{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--gold);
}
.bar--red .bar__label{color:var(--cinnabar-soft)}
.bar__main{flex:1 1 260px;min-width:0}

/* ---------- tags & dots ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;
  border:1px solid rgba(244,239,228,.26);
  border-radius:999px;
  font-size:12px;letter-spacing:.08em;
  color:var(--text-dim);
  font-variant-numeric:tabular-nums;
  transition:background-color .22s ease,border-color .22s ease,color .22s ease;
}
.tag--gold{border-color:var(--gold-hair);color:var(--gold-bright);background:rgba(201,162,39,.1)}
.tag--red{border-color:rgba(178,58,46,.7);color:var(--cinnabar-soft);background:rgba(178,58,46,.14)}
.tag--ghost{color:var(--line);border-color:rgba(140,140,134,.45)}
.tag--fill{background:var(--gold);border-color:var(--gold-bright);color:var(--ink);font-weight:600}
a.tag:hover,.rule-card:hover .tag--ghost{border-color:var(--gold);color:var(--gold-bright)}

.dot{
  display:inline-block;flex:0 0 auto;
  width:9px;height:9px;border-radius:50%;
  border:1.5px solid currentColor;
  color:var(--mist);
}
.dot--on{background:currentColor;color:var(--gold)}
.dot--off{color:var(--line)}
.dot--tri{
  width:0;height:0;border:0;border-radius:0;
  border-left:5px solid transparent;
  border-right:5px solid transparent;
  border-bottom:9px solid currentColor;
  color:var(--cinnabar-soft);
}

/* ---------- filter / year rail ---------- */
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.filter-chip{
  padding:7px 15px;
  border:1px solid rgba(140,140,134,.45);
  border-radius:999px;
  font-size:13px;letter-spacing:.06em;
  color:var(--text-dim);
  font-variant-numeric:tabular-nums;
  cursor:pointer;
  transition:background-color .22s ease,border-color .22s ease,color .22s ease;
}
.filter-chip:hover{border-color:var(--gold);color:var(--gold-bright)}
.filter-chip[aria-pressed="true"]{
  background:var(--gold);border-color:var(--gold-bright);color:var(--ink);font-weight:600;
}

.year-rail{
  display:flex;gap:8px;
  overflow-x:auto;
  padding-bottom:8px;
  scrollbar-width:thin;
  scrollbar-color:var(--gold-hair) transparent;
}
.year-rail__btn{
  flex:0 0 auto;
  padding:10px 20px;
  border:1px solid rgba(140,140,134,.42);
  background:transparent;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:15px;letter-spacing:.06em;
  color:var(--mist);
  cursor:pointer;
  transition:background-color .22s ease,border-color .22s ease,color .22s ease;
}
.year-rail__btn:hover{border-color:var(--gold);color:var(--gold-bright)}
.year-rail__btn[aria-pressed="true"]{background:var(--gold);border-color:var(--gold-bright);color:var(--ink)}

/* ---------- figure / image slots ---------- */
.figure{
  position:relative;
  overflow:hidden;
  background:var(--fabric-deep);
  border:1px solid var(--hair);
}
.figure__media{
  display:block;
  width:100%;
  aspect-ratio:16/10;
  background-color:var(--fabric-deep);
  background-image:
    repeating-linear-gradient(45deg,rgba(201,162,39,.09) 0 2px,transparent 2px 11px),
    radial-gradient(circle at 28% 26%,rgba(27,74,60,.95),rgba(14,43,35,1) 72%);
  background-size:auto,cover;
}
.figure__media > img,
.figure__media > svg,
.figure__media > picture,
.figure__media > picture > img{
  width:100%;height:100%;object-fit:cover;display:block;
}
.figure--wide .figure__media{aspect-ratio:21/9}
.figure--square .figure__media{aspect-ratio:1/1}
.figure--tall .figure__media{aspect-ratio:3/4}
.figure__caption{
  padding:11px 15px;
  border-top:1px solid var(--hair);
  font-size:13px;
  color:var(--mist);
}

/* ---------- copy feedback ---------- */
[data-copy]{cursor:pointer;transition:color .2s ease}
[data-copy]:hover{color:var(--gold-bright)}
[data-copy][data-copied]::after{
  content:"已复制";
  margin-left:10px;
  font-family:var(--font-text);
  font-size:12px;letter-spacing:.08em;
  color:var(--gold-bright);
}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .brand__sub{display:none}
}
@media (max-width:1080px){
  .version-chip{display:none}
}
@media (max-width:960px){
  :root{--header-h:62px}
  .nav-toggle{display:inline-flex}
  .site-header{background:rgba(14,43,35,.94)}
  .site-header[data-scrolled]{background:rgba(14,43,35,.985)}
  .nav{
    position:fixed;
    top:var(--header-h);left:0;right:0;
    z-index:75;
    display:block;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    padding:12px 20px 24px;
    background:rgba(14,43,35,.99);
    border-top:1px solid rgba(201,162,39,.22);
    border-bottom:1px solid var(--gold-hair);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .24s ease,transform .24s ease,visibility .24s;
  }
  .nav[data-open]{opacity:1;visibility:visible;transform:none}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{
    display:flex;align-items:center;justify-content:space-between;
    padding:15px 6px;
    font-size:16.5px;
    color:var(--text-soft);
    border-bottom:1px solid rgba(244,239,228,.08);
  }
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{
    color:var(--gold-bright);
    padding-left:16px;
    box-shadow:inset 3px 0 0 var(--gold);
  }
  .site-footer__grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-summary,.footer-note{max-width:none}
  .site-footer__bar{flex-direction:column;align-items:flex-start;gap:14px}
  .footer-legal{margin-inline:0}
}
@media (max-width:620px){
  .wrap{width:min(100% - 30px,var(--wrap))}
  .site-footer__grid{grid-template-columns:1fr;gap:32px}
  .brand__line{font-size:15px}
  .brand__mark{width:34px;height:34px;flex-basis:34px;font-size:17px}
  .header-actions{gap:8px}
  .btn--sm{padding:8px 11px;font-size:12.5px;letter-spacing:.04em}
  .nav-toggle__text{display:none}
  .to-top{width:42px;height:42px}
}

/* ---------- 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;
  }
  .rule-card:hover{transform:none}
}