/* ============================================================
   乐鱼体育中文站 · 共享样式 /assets/site.css
   深海矿物色谱 · 堆叠切角面板 · 泳道路径线
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --abyss-900:#041C2C;
  --abyss-700:#0A3550;
  --abyss-500:#135A7A;
  --cyan-400:#2EE6D6;
  --cyan-700:#0B7F78;
  --coral-500:#FF6B4A;
  --coral-700:#B93E24;
  --stone-500:#7D8A8E;
  --shell-100:#F4EFE6;
  --moss-600:#4E6B54;
  --clay-500:#B26A4F;

  --ink:#061A26;
  --ink-soft:#12303E;

  --line-cyan:rgba(46,230,214,.18);
  --line-cyan-strong:rgba(46,230,214,.42);
  --line-soft:rgba(244,239,230,.14);

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;

  --cut:22px;
  --maxw:1320px;
  --pad-x:clamp(20px,6vw,88px);
  --header-h:72px;

  --ease:cubic-bezier(.22,.72,.3,1);
}

/* ---------- 2. 重置 ---------- */
*,
*::before,
*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 20px);
}

body{
  margin:0;
  background-color:var(--abyss-900);
  background-image:
    radial-gradient(1100px 560px at 82% -8%, rgba(46,230,214,.10), transparent 62%),
    radial-gradient(880px 520px at -12% 18%, rgba(255,107,74,.07), transparent 60%);
  background-repeat:no-repeat;
  color:var(--shell-100);
  font-family:var(--font-body);
  font-size:clamp(15px,1.05vw,17px);
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

img,
svg,
video{display:block;max-width:100%;height:auto;}

a{
  color:var(--cyan-400);
  text-decoration-color:rgba(46,230,214,.42);
  text-underline-offset:3px;
}

button{font-family:inherit;}

ul,
ol{list-style:none;margin:0;padding:0;}

::selection{background:var(--coral-500);color:#04121B;}

:focus-visible{
  outline:2px solid var(--cyan-400);
  outline-offset:3px;
  border-radius:2px;
}

.panel--light :focus-visible,
.skip-link:focus-visible{outline-color:var(--coral-700);}

/* ---------- 3. 中文排版 ---------- */
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-head);
  font-weight:900;
  letter-spacing:-.03em;
  line-height:1.04;
  margin:0;
  text-wrap:balance;
}

h1{font-size:clamp(2.2rem,5vw,4.2rem);line-height:.98;}
h2{font-size:clamp(1.6rem,3.2vw,2.7rem);}
h3{font-size:clamp(1.15rem,1.7vw,1.5rem);letter-spacing:-.02em;line-height:1.25;}

.display{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(2.6rem,6vw,5.8rem);
  line-height:.95;
  letter-spacing:-.03em;
  margin:0;
}

p{margin:0 0 1.05em;}
p:last-child{margin-bottom:0;}

strong{font-weight:800;}
small{font-size:.82em;}

/* ---------- 4. 布局容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}

#main-content{display:block;}

.section{padding-block:clamp(44px,6.5vw,104px);}
.section--tight{padding-block:clamp(28px,4vw,60px);}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:clamp(14px,2vw,32px);
  margin-bottom:clamp(22px,3vw,44px);
}

.stack{display:grid;gap:clamp(14px,2.2vw,30px);}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.55em;
  margin:0 0 .9em;
  font-size:11px;
  font-weight:800;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan-400);
}

.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  background:var(--coral-500);
  flex:none;
}

.visually-hidden{
  position:absolute;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* ---------- 5. 12 列栅格 ---------- */
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(14px,2vw,28px);
}

.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.col-5{grid-column:span 5;}
.col-6{grid-column:span 6;}
.col-7{grid-column:span 7;}
.col-8{grid-column:span 8;}
.col-12{grid-column:span 12;}

/* ---------- 6. 堆叠切角面板 ---------- */
.panel{
  --cut:22px;
  position:relative;
  padding:clamp(20px,3vw,44px);
  background:
    linear-gradient(155deg,rgba(19,90,122,.52),rgba(4,28,44,.92) 78%),
    var(--abyss-700);
  clip-path:polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
  overflow:hidden;
}

.panel::before{
  content:"";
  position:absolute;
  inset-inline:0;
  top:0;
  height:2px;
  background:linear-gradient(90deg,var(--cyan-400),rgba(46,230,214,0) 72%);
  pointer-events:none;
}

.panel--light{
  background:
    linear-gradient(160deg,#FCF8F0,rgba(244,239,230,.98) 60%),
    var(--shell-100);
  color:var(--ink);
}

.panel--light::before{
  background:linear-gradient(90deg,var(--clay-500),rgba(178,106,79,0) 72%);
}

.panel--light a{color:var(--cyan-700);}
.panel--light a:hover{color:var(--coral-700);}

/* ---------- 7. 按钮 ---------- */
.btn{
  --cut:10px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:.72em 1.25em;
  font-family:var(--font-head);
  font-size:13.5px;
  font-weight:800;
  letter-spacing:.06em;
  line-height:1.2;
  text-decoration:none;
  white-space:nowrap;
  cursor:pointer;
  border:0;
  background:var(--cyan-400);
  color:#04121B;
  clip-path:polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%
  );
  transition:transform .25s var(--ease), background-color .25s var(--ease), color .25s var(--ease);
}

.btn:hover,
.btn:focus-visible{
  transform:translateY(-2px);
  background:#5CF0E4;
}

.btn:active{transform:translateY(0);}

.btn--coral{background:var(--coral-500);color:#0B1A22;}
.btn--coral:hover,
.btn--coral:focus-visible{background:#FF8A6E;}

.btn--ghost{
  background:transparent;
  color:var(--shell-100);
  box-shadow:inset 0 0 0 1px var(--line-cyan-strong);
}
.btn--ghost:hover,
.btn--ghost:focus-visible{
  background:rgba(46,230,214,.12);
  color:var(--shell-100);
}

.btn--sm{
  padding:.55em 1em;
  font-size:12px;
  letter-spacing:.1em;
}

/* ---------- 8. 页头命令栏 ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  padding:.7em 1.2em;
  background:var(--coral-500);
  color:#04121B;
  font-size:13px;
  font-weight:800;
  letter-spacing:.08em;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
}

.skip-link:focus{transform:translateY(0);}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(4,28,44,.93);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
  box-shadow:0 1px 0 var(--line-cyan);
}

.site-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(46,230,214,.12);
  overflow:hidden;
  pointer-events:none;
}

.site-progress > span{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(90deg,var(--cyan-400),var(--coral-500));
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .12s linear;
}

.header-inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,1.6vw,28px);
  min-height:var(--header-h);
  padding-block:12px;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:none;
  text-decoration:none;
  color:var(--shell-100);
}

.brand__mark{
  position:relative;
  width:30px;
  height:30px;
  flex:none;
  background:linear-gradient(135deg,var(--cyan-400) 8%,var(--abyss-500) 96%);
  clip-path:polygon(0 0,100% 0,100% 58%,58% 100%,0 100%);
  transition:transform .35s var(--ease);
}

.brand__mark::after{
  content:"";
  position:absolute;
  left:7px;
  right:7px;
  top:50%;
  height:2px;
  background:var(--abyss-900);
  transform:translateY(-50%);
}

.brand:hover .brand__mark{transform:rotate(-8deg);}

.brand__text{
  display:flex;
  flex-direction:column;
  gap:3px;
  line-height:1;
}

.brand__name{
  font-family:var(--font-head);
  font-size:18px;
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.05;
}

.brand__suffix{
  font-size:10.5px;
  font-weight:700;
  letter-spacing:.26em;
  color:var(--cyan-400);
}

.brand__tagline{
  display:none;
  writing-mode:vertical-rl;
  font-size:10px;
  letter-spacing:.26em;
  color:var(--stone-500);
  border-left:1px solid rgba(125,138,142,.45);
  padding-left:7px;
  max-height:36px;
  overflow:hidden;
}

/* 主导航 */
.nav{margin-inline-start:auto;}

.nav__list{
  display:flex;
  align-items:center;
  gap:clamp(8px,1.15vw,22px);
}

.nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:5px;
  padding:9px 2px;
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.14em;
  color:rgba(244,239,230,.72);
  text-decoration:none;
  transition:color .25s var(--ease);
  white-space:nowrap;
}

.nav__index{
  font-size:10px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--stone-500);
  font-variant-numeric:tabular-nums;
  transition:color .25s var(--ease);
}

.nav__link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:var(--cyan-400);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .3s var(--ease);
}

.nav__link:hover{color:var(--shell-100);}
.nav__link:hover::after{transform:scaleX(1);}

.nav__link[aria-current="page"]{color:var(--cyan-400);}
.nav__link[aria-current="page"]::after{transform:scaleX(1);}
.nav__link[aria-current="page"] .nav__index{
  color:var(--cyan-400);
  letter-spacing:.06em;
}
.nav__link[aria-current="page"] .nav__index::before{content:"[";}
.nav__link[aria-current="page"] .nav__index::after{content:"]";}

/* 头部行动区 */
.header-actions{
  display:flex;
  align-items:center;
  gap:8px;
  flex:none;
}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-inline-start:auto;
  padding:9px 13px;
  background:transparent;
  color:var(--shell-100);
  border:1px solid var(--line-cyan-strong);
  font-size:11.5px;
  font-weight:800;
  letter-spacing:.18em;
  line-height:1;
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
  transition:background-color .2s var(--ease), border-color .2s var(--ease);
}

.nav-toggle:hover{background:rgba(46,230,214,.12);}

.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;
  height:10px;
  flex:none;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;right:0;
  height:2px;
  background:var(--cyan-400);
  transition:transform .3s var(--ease), top .3s var(--ease), bottom .3s var(--ease);
}

.nav-toggle__bars::before{top:0;}
.nav-toggle__bars::after{bottom:0;}

.site-header[data-open] .nav-toggle__bars::before{top:4px;transform:rotate(45deg);}
.site-header[data-open] .nav-toggle__bars::after{bottom:4px;transform:rotate(-45deg);}

.nav-toggle__label{display:inline;}

/* ---------- 9. 通用内容组件 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.45em;
  padding:.28em .7em;
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--cyan-400);
  background:rgba(46,230,214,.09);
  border:1px solid var(--line-cyan);
  white-space:nowrap;
}

.tag--hot{
  color:#0B1A22;
  background:var(--coral-500);
  border-color:transparent;
  font-weight:800;
}

.tag--steady{
  color:var(--moss-600);
  background:rgba(78,107,84,.14);
  border-color:rgba(78,107,84,.4);
}

.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  aspect-ratio:16 / 9;
  background:
    linear-gradient(140deg,var(--abyss-700),var(--abyss-900) 72%),
    var(--abyss-700);
  clip-path:polygon(
    0 0,
    100% 0,
    100% calc(100% - 20px),
    calc(100% - 20px) 100%,
    0 100%
  );
}

.media-frame > img{
  width:100%;
  height:100%;
  object-fit:cover;
}

.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(4,28,44,0) 44%,rgba(4,28,44,.58));
  pointer-events:none;
}

.media-frame--portrait{aspect-ratio:3 / 4;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame--wide{aspect-ratio:21 / 9;}

.media-frame--placeholder{
  display:grid;
  place-items:center;
  font-size:11px;
  letter-spacing:.24em;
  color:rgba(244,239,230,.4);
  text-align:center;
  padding:16px;
}

.breadcrumb{margin-bottom:clamp(18px,2.4vw,32px);}

.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5em;
  font-size:12px;
  letter-spacing:.12em;
  color:var(--stone-500);
}

.breadcrumb li{display:inline-flex;align-items:center;gap:.5em;}
.breadcrumb li + li::before{content:"/";color:var(--line-cyan-strong);}
.breadcrumb a{color:var(--cyan-400);text-decoration:none;}
.breadcrumb a:hover{color:var(--coral-500);}
.breadcrumb [aria-current="page"]{color:rgba(244,239,230,.82);}

.prose{max-width:38em;font-size:1em;line-height:1.9;}
.prose > * + *{margin-top:1.1em;}
.prose h2{font-size:clamp(1.35rem,2.2vw,1.9rem);line-height:1.15;margin-top:1.9em;}
.prose h3{font-size:clamp(1.05rem,1.6vw,1.3rem);margin-top:1.6em;}
.prose ul,
.prose ol{padding-left:1.25em;}
.prose ul li{list-style:none;position:relative;}
.prose ul li::before{
  content:"";
  position:absolute;
  left:-1em;top:.85em;
  width:7px;height:2px;
  background:var(--cyan-400);
}
.prose ol{list-style:decimal;}
.prose ol li{list-style:decimal;}
.prose blockquote{
  margin:1.4em 0;
  padding:.2em 0 .2em 1.2em;
  border-left:2px solid var(--clay-500);
  color:rgba(244,239,230,.78);
  font-style:normal;
}
.panel--light .prose blockquote{color:#2B3F49;}

.index-note{
  writing-mode:vertical-rl;
  font-size:11px;
  font-weight:700;
  letter-spacing:.28em;
  color:var(--stone-500);
  text-transform:uppercase;
}

.swimline{
  position:relative;
  width:2px;
  background:linear-gradient(180deg,var(--cyan-400),rgba(46,230,214,.06));
}

.dot-field{
  background-image:radial-gradient(circle,rgba(46,230,214,.55) 1.5px,transparent 1.6px);
  background-size:14px 14px;
  background-repeat:repeat;
}

.divider-slash{
  height:clamp(28px,4vw,56px);
  background:
    repeating-linear-gradient(
      104deg,
      rgba(46,230,214,.22) 0 2px,
      transparent 2px 26px
    );
  clip-path:polygon(0 62%,100% 0,100% 38%,0 100%);
  opacity:.7;
}

/* ---------- 10. 页脚 ---------- */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,var(--abyss-900),#03151F 78%);
  border-top:1px solid var(--line-cyan);
  padding-block:clamp(42px,6vw,86px) 26px;
}

.site-footer::before{
  content:"";
  position:absolute;
  inset-inline:0;
  top:0;
  height:2px;
  background:linear-gradient(90deg,transparent,var(--cyan-400) 30%,var(--coral-500) 72%,transparent);
  opacity:.7;
}

.footer-top{
  display:grid;
  grid-template-columns:1.8fr 1fr 1fr 1fr;
  gap:clamp(22px,4vw,56px);
  padding-bottom:clamp(28px,4vw,52px);
  border-bottom:1px solid var(--line-soft);
}

.footer-brand{min-width:0;}

.brand--footer .brand__name{font-size:19px;}
.brand--footer .brand__mark{width:26px;height:26px;}

.footer-brand::after{
  content:"";
  display:block;
  width:104px;
  height:14px;
  margin-top:20px;
  background-image:radial-gradient(circle,rgba(46,230,214,.5) 1.5px,transparent 1.6px);
  background-size:13px 13px;
  background-repeat:repeat-x;
  opacity:.8;
}

.footer-summary{
  margin-top:16px;
  max-width:32em;
  font-size:14px;
  line-height:1.9;
  color:rgba(244,239,230,.72);
}

.footer-note{
  margin-top:10px;
  max-width:34em;
  font-size:12.5px;
  line-height:1.8;
  letter-spacing:.02em;
  color:var(--stone-500);
}

.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-head);
  font-size:11px;
  font-weight:800;
  letter-spacing:.24em;
  line-height:1.4;
  text-transform:uppercase;
  color:var(--cyan-400);
}

.footer-col ul{display:grid;gap:9px;}

.footer-col a{
  display:inline-block;
  font-size:14px;
  color:rgba(244,239,230,.74);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .22s var(--ease), border-color .22s var(--ease);
}

.footer-col a:hover,
.footer-col a:focus-visible{
  color:var(--coral-500);
  border-bottom-color:rgba(255,107,74,.55);
}

.footer-contact{
  display:grid;
  grid-template-columns:1.1fr 2.1fr auto;
  align-items:start;
  gap:clamp(18px,3vw,42px);
  padding-block:clamp(26px,3.4vw,46px);
  border-bottom:1px solid var(--line-soft);
}

.footer-contact__head .footer-col__title{margin-bottom:10px;}

.footer-contact__list{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:18px 24px;
  margin:0;
}

.footer-contact__item{
  display:flex;
  flex-direction:column;
  gap:5px;
  min-width:0;
}

.footer-contact__item dt{
  font-size:10.5px;
  font-weight:700;
  letter-spacing:.22em;
  color:var(--stone-500);
}

.footer-contact__item dd{
  margin:0;
  font-size:14px;
  line-height:1.6;
  color:var(--shell-100);
  word-break:break-word;
}

.footer-contact .btn{justify-self:start;}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:10px 26px;
  padding-top:22px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--stone-500);
}

.footer-base p{margin:0;}
.footer-icp{font-variant-numeric:tabular-nums;}

/* ---------- 11. 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(14px,3vw,32px);
  bottom:clamp(14px,3vw,32px);
  z-index:90;
  width:48px;
  height:48px;
  display:grid;
  place-items:center;
  padding:0;
  border:1px solid var(--line-cyan-strong);
  background:rgba(10,53,80,.94);
  color:var(--cyan-400);
  font-size:17px;
  line-height:1;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(14px);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);
  transition:opacity .3s var(--ease), transform .3s var(--ease), visibility .3s, background-color .22s var(--ease), color .22s var(--ease);
}

.to-top.is-on{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

.to-top:hover{
  background:var(--coral-500);
  color:#0B1A22;
}

/* ---------- 12. 响应式 ---------- */
@media (min-width:1280px){
  .brand__tagline{display:block;}
}

@media (max-width:1080px){
  .header-inner{flex-wrap:wrap;row-gap:0;}

  .nav-toggle{display:inline-flex;}

  .nav{
    display:none;
    order:5;
    flex-basis:100%;
    width:100%;
    margin-inline-start:0;
  }

  .site-header[data-open] .nav{display:block;}

  .nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding-block:6px 4px;
    border-top:1px solid var(--line-cyan);
  }

  .nav__link{
    justify-content:flex-start;
    padding:13px 4px;
    font-size:13px;
    letter-spacing:.16em;
    border-bottom:1px solid rgba(46,230,214,.09);
  }

  .nav__link::after{display:none;}

  .nav__link[aria-current="page"]{
    color:var(--cyan-400);
    background:linear-gradient(90deg,rgba(46,230,214,.14),transparent 70%);
  }

  .nav__index{font-size:11px;}

  .header-actions{
    display:none;
    order:6;
    flex-basis:100%;
    width:100%;
    padding-block:12px 16px;
    gap:10px;
  }

  .site-header[data-open] .header-actions{display:flex;}

  .header-actions .btn{flex:1 1 auto;}

  .footer-top{grid-template-columns:1fr 1fr;}

  .footer-brand{grid-column:1 / -1;}

  .footer-contact{grid-template-columns:1fr;}

  .footer-contact__list{grid-template-columns:repeat(3,minmax(0,1fr));}

  .footer-contact .btn{justify-self:start;}
}

@media (max-width:960px){
  .grid-12{grid-template-columns:repeat(12,minmax(0,1fr));}
  .col-3,
  .col-4{grid-column:span 6;}
  .col-5,
  .col-6,
  .col-7,
  .col-8,
  .col-12{grid-column:1 / -1;}

  .prose{max-width:none;}
}

@media (max-width:680px){
  :root{--header-h:64px;}

  .col-3,
  .col-4,
  .col-5,
  .col-6,
  .col-7,
  .col-8,
  .col-12{grid-column:1 / -1;}

  .footer-top{grid-template-columns:1fr;gap:26px;}

  .footer-contact__list{grid-template-columns:1fr;}

  .footer-base{flex-direction:column;align-items:flex-start;gap:8px;}

  .brand__name{font-size:16.5px;}

  .to-top{
    width:44px;
    height:44px;
  }

  .section{padding-block:clamp(34px,9vw,56px);}
}

@media (max-width:420px){
  .header-actions{flex-direction:column;align-items:stretch;}
  .header-actions .btn{width:100%;}
}

/* ---------- 13. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}

  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }

  .btn:hover,
  .btn:focus-visible{transform:none;}

  .brand:hover .brand__mark{transform:none;}

  .to-top{transform:none;}
}