/* =========================================================
   彩娱乐会馆 · /assets/site.css
   共享层：reset、令牌、排版、外壳、通用组件
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-padding-top:7.5rem;
}

@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

body,
h1,h2,h3,h4,h5,h6,
p,figure,blockquote,
dl,dd,ul,ol{margin:0}

ul[class],
ol[class]{list-style:none;padding:0}

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

button{font:inherit;color:inherit;background:none;border:0;padding:0}

:focus-visible{outline:3px solid var(--mint);outline-offset:3px}

::selection{background:var(--coral);color:#1b0b06}

/* ---------- 2. 设计令牌 ---------- */
:root{
  --ink-900:#071826;
  --ink-800:#0D2436;
  --ink-700:#17384C;
  --coral:#FF7A59;
  --coral-deep:#B84A36;
  --mint:#45F2C8;
  --amber:#F6C453;
  --paper:#F7F2E8;
  --cream:#E8DDC8;
  --mist:#A8B8C4;

  --line:rgba(168,184,196,.24);
  --line-soft:rgba(168,184,196,.13);
  --glow-coral:rgba(255,122,89,.16);
  --glow-mint:rgba(69,242,200,.10);

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --font-serif:Georgia,"Songti SC","Source Han Serif SC","Noto Serif SC",serif;

  --shell:min(calc(100% - 2.5rem), 1240px);
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-soft:0 18px 40px rgba(0,0,0,.38);
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 540px at 84% -8%, var(--glow-coral), transparent 62%),
    radial-gradient(880px 460px at 2% 4%, var(--glow-mint), transparent 66%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.2;
  letter-spacing:-.015em;
  text-wrap:balance;
}

h1{font-size:clamp(2.15rem,5vw,3.6rem)}
h2{font-size:clamp(1.6rem,3vw,2.25rem)}
h3{font-size:clamp(1.2rem,2vw,1.5rem);letter-spacing:-.005em}
h4{font-size:1.05rem}

p{text-wrap:pretty}

a{color:var(--paper);text-decoration-color:rgba(69,242,200,.5);text-underline-offset:.22em}

strong{font-weight:700;color:#fff}

small{font-size:.8rem}

hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}

/* ---------- 4. 布局基础 ---------- */
.wrap{
  width:var(--shell);
  margin-inline:auto;
}

.section{
  padding-block:clamp(2.6rem,6vw,5rem);
}

.section-head{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:.6rem;
  margin-bottom:clamp(1.6rem,3vw,2.6rem);
  padding-bottom:1rem;
  border-bottom:1px solid var(--line-soft);
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.22em;
  color:var(--mint);
  text-transform:uppercase;
}

.section-title{
  font-size:clamp(1.5rem,2.6vw,2.05rem);
  margin:0;
}

.section-lead{
  max-width:38ch;
  color:var(--mist);
  font-size:.95rem;
  line-height:1.8;
}

.grid{
  display:grid;
  gap:clamp(1.1rem,2.2vw,1.9rem);
}

.grid--split{
  grid-template-columns:minmax(0,3fr) minmax(0,9fr);
  align-items:start;
}

.grid--cards{
  grid-template-columns:repeat(auto-fit,minmax(16rem,1fr));
}

/* ---------- 5. 通用按钮与标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.78rem 1.4rem;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-family:var(--font-display);
  font-size:.92rem;
  font-weight:800;
  letter-spacing:.03em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}

.btn--primary{
  background:var(--coral);
  color:#1c0a04;
  box-shadow:0 0 0 1px rgba(255,122,89,.4),0 12px 26px rgba(255,122,89,.16);
}

.btn--primary:hover{
  background:#ff8f73;
  transform:translateY(-1px);
}

.btn--ghost{
  border-color:var(--line);
  color:var(--paper);
  background:rgba(23,56,76,.35);
}

.btn--ghost:hover{
  border-color:var(--mint);
  color:var(--mint);
}

.btn:active{transform:translateY(1px)}

.pill{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.28rem .7rem;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--mist);
  line-height:1.6;
  white-space:nowrap;
}

.pill--mint{border-color:rgba(69,242,200,.45);color:var(--mint)}
.pill--amber{border-color:rgba(246,196,83,.5);color:var(--amber)}
.pill--coral{border-color:rgba(255,122,89,.5);color:var(--coral)}

.num-mono{
  font-family:var(--font-mono);
  font-size:.82em;
  letter-spacing:.04em;
  font-variant-numeric:tabular-nums;
}

/* ---------- 6. 面板、纸张与图像容器 ---------- */
.panel{
  position:relative;
  background:linear-gradient(180deg,rgba(23,56,76,.62),rgba(13,36,54,.42));
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(1.1rem,2vw,1.7rem);
}

.paper{
  position:relative;
  background:var(--cream);
  color:#0e1f2b;
  padding:clamp(1.2rem,2.4vw,1.9rem);
  border-radius:var(--radius);
  box-shadow:var(--shadow-soft);
}

.paper::after{
  content:"";
  position:absolute;
  right:-8px;
  bottom:-8px;
  width:62%;
  height:62%;
  border-right:1px solid rgba(232,221,200,.55);
  border-bottom:1px solid rgba(232,221,200,.55);
  pointer-events:none;
}

.paper h2,
.paper h3{color:#0b1c27}

.paper a{color:var(--coral-deep);text-decoration-color:rgba(184,74,54,.5)}

.media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:var(--media-ratio,16/9);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background-color:var(--ink-700);
  background-image:
    linear-gradient(135deg,rgba(23,56,76,.92),rgba(7,24,38,.96)),
    repeating-linear-gradient(90deg,rgba(69,242,200,.09) 0 1px,transparent 1px 36px),
    repeating-linear-gradient(0deg,rgba(255,122,89,.07) 0 1px,transparent 1px 36px);
}

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

.media::after{
  content:"";
  position:absolute;
  inset:auto 0 0 0;
  height:42%;
  background:linear-gradient(180deg,transparent,rgba(7,24,38,.7));
  pointer-events:none;
}

.media--wide{--media-ratio:21/9}
.media--tall{--media-ratio:3/4}
.media--square{--media-ratio:1/1}

.media-frame{
  border:6px solid var(--cream);
  border-left-width:14px;
  border-radius:1px;
  box-shadow:var(--shadow-soft);
}

.media-caption{
  margin-top:.65rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.05em;
  color:var(--mist);
  line-height:1.7;
}

/* ---------- 7. 面包屑与正文容器 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:var(--mist);
  padding-block:.2rem 0;
}

.crumbs a{
  color:var(--mist);
  text-decoration:none;
  transition:color .2s var(--ease);
}

.crumbs a:hover{color:var(--mint)}

.crumbs-sep{color:var(--line);font-size:.8em}

.crumbs [aria-current="page"]{color:var(--paper)}

.prose{
  max-width:38rem;
  font-size:1rem;
  line-height:1.9;
}

.prose > * + *{margin-top:1.15rem}

.prose h2{margin-top:2.4rem;font-size:clamp(1.35rem,2.2vw,1.7rem)}
.prose h3{margin-top:1.9rem;font-size:1.15rem}

.prose ul,
.prose ol{
  padding-left:1.35rem;
  list-style:disc;
}

.prose ol{list-style:decimal}

.prose li + li{margin-top:.5rem}

.prose a{color:var(--mint)}

.prose blockquote{
  border-left:3px solid var(--amber);
  padding-left:1.1rem;
  color:var(--cream);
  font-family:var(--font-serif);
  font-size:1.05rem;
}

/* ---------- 8. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:.85rem;
  left:.85rem;
  z-index:300;
  padding:.72rem 1.15rem;
  background:var(--mint);
  color:#04211a;
  font-family:var(--font-display);
  font-weight:800;
  font-size:.88rem;
  text-decoration:none;
  border-radius:var(--radius);
  box-shadow:0 12px 26px rgba(0,0,0,.42);
  transform:translateY(-190%);
  transition:transform .22s var(--ease);
}

.skip-link:focus{transform:translateY(0)}
.skip-link:focus-visible{outline-color:var(--paper)}

/* ---------- 9. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(7,24,38,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-soft);
}

.site-header::after{
  content:"";
  position:absolute;
  inset:0;
  background:radial-gradient(440px 130px at 90% 0%,rgba(255,122,89,.18),transparent 72%);
  pointer-events:none;
  z-index:0;
}

.scroll-meter{
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:3px;
  background:linear-gradient(90deg,var(--coral),var(--amber) 55%,var(--mint));
  z-index:3;
  pointer-events:none;
  transition:width .1s linear;
}

.header-inner{
  position:relative;
  z-index:2;
  width:var(--shell);
  margin-inline:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1.5rem;
  padding-block:.95rem;
}

.brand-cluster{
  display:flex;
  align-items:center;
  gap:1rem;
  min-width:0;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:.8rem;
  text-decoration:none;
  color:var(--paper);
}

.brand-mark{
  position:relative;
  display:grid;
  place-items:center;
  flex:none;
  width:2.5rem;
  height:2.5rem;
  border:1px solid var(--coral);
  color:var(--coral);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  line-height:1;
}

.brand-mark::before{
  content:"";
  position:absolute;
  inset:4px;
  border:1px solid rgba(69,242,200,.45);
}

.brand-mark::after{
  content:"";
  position:absolute;
  top:-3px;
  right:-3px;
  width:6px;
  height:6px;
  background:var(--mint);
}

.brand-text{display:block;min-width:0}

.brand-name{
  display:block;
  font-family:var(--font-display);
  font-size:1.14rem;
  font-weight:900;
  letter-spacing:.01em;
  line-height:1.35;
}

.brand-tagline{
  display:block;
  margin-top:.1rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.16em;
  line-height:1.4;
  color:var(--mist);
}

.version-chip{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.3rem .62rem;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(13,36,54,.7);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
  line-height:1.5;
  white-space:nowrap;
}

.version-chip-key{color:var(--mist)}

.version-chip-code{
  color:var(--amber);
  border-left:1px solid var(--line);
  padding-left:.5rem;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.55rem;
  flex:none;
  padding:.5rem .8rem;
  border:1px solid var(--line);
  border-radius:var(--radius);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.14em;
  cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}

.nav-toggle:hover{border-color:var(--mint);color:var(--mint)}

.nav-toggle-bars{
  display:grid;
  gap:3px;
  width:1.15rem;
}

.nav-toggle-bars > span{
  display:block;
  height:1.5px;
  background:currentColor;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}

.primary-nav{
  display:flex;
  align-items:center;
  gap:1.1rem;
  min-width:0;
}

.nav-list{
  display:flex;
  align-items:center;
  gap:.1rem;
}

.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:.42rem;
  padding:.55rem .68rem .72rem;
  color:var(--mist);
  text-decoration:none;
  font-size:.92rem;
  letter-spacing:.02em;
  line-height:1.4;
  white-space:nowrap;
  transition:color .2s var(--ease);
}

.nav-num{
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.05em;
  color:rgba(168,184,196,.55);
  transition:color .2s var(--ease);
}

.nav-link::after{
  content:"";
  position:absolute;
  left:.68rem;
  right:.68rem;
  bottom:.34rem;
  height:2px;
  background:linear-gradient(90deg,var(--coral),var(--amber));
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible{color:var(--paper)}

.nav-link:hover .nav-num{color:var(--mint)}
.nav-link:hover::after{transform:scaleX(1)}

.nav-link[aria-current="page"]{color:var(--paper);font-weight:700}
.nav-link[aria-current="page"] .nav-num{color:var(--coral)}
.nav-link[aria-current="page"]::after{
  transform:scaleX(1);
  background:linear-gradient(90deg,var(--coral),var(--mint));
}

.nav-utility{
  display:flex;
  align-items:center;
  gap:.55rem;
  margin-left:.5rem;
  padding-left:1.05rem;
  border-left:1px solid var(--line-soft);
  font-size:.74rem;
  line-height:1.6;
  white-space:nowrap;
}

.nav-utility-tip{
  font-family:var(--font-mono);
  letter-spacing:.1em;
  color:var(--mist);
}

.nav-utility-link{
  color:var(--mint);
  text-decoration:none;
  border-bottom:1px solid rgba(69,242,200,.45);
  padding-bottom:1px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}

.nav-utility-link:hover{
  color:var(--paper);
  border-color:var(--paper);
}

/* ---------- 10. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,5.5rem);
  background-color:var(--ink-800);
  background-image:radial-gradient(700px 320px at 12% 0%,rgba(69,242,200,.07),transparent 70%);
  background-repeat:no-repeat;
  border-top:1px solid var(--line);
  color:var(--paper);
  padding-block:clamp(2.2rem,4vw,3.2rem) 1.6rem;
}

.footer-inner{
  width:var(--shell);
  margin-inline:auto;
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);
  gap:clamp(1.6rem,4vw,3rem);
  padding-bottom:clamp(1.6rem,3vw,2.2rem);
  border-bottom:1px solid var(--line-soft);
}

.footer-brand{
  font-family:var(--font-display);
  font-size:clamp(1.35rem,2.4vw,1.75rem);
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.25;
}

.footer-tagline{
  margin-top:.4rem;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.18em;
  color:var(--mint);
}

.footer-index-hint{
  margin-top:1rem;
  max-width:34ch;
  font-size:.86rem;
  line-height:1.8;
  color:var(--mist);
}

.footer-note{
  margin-top:.7rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:rgba(168,184,196,.8);
}

.footer-links{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1.5rem 2rem;
}

.footer-nav{
  display:flex;
  flex-direction:column;
  gap:.5rem;
}

.footer-nav-title{
  margin-bottom:.4rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.2em;
  color:var(--mint);
}

.footer-link{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  font-size:.9rem;
  line-height:1.7;
  color:var(--paper);
  text-decoration:none;
  transition:color .2s var(--ease);
}

.footer-link::before{
  content:"";
  flex:none;
  width:6px;
  height:6px;
  border:1px solid var(--line);
  transition:background-color .2s var(--ease),border-color .2s var(--ease);
}

.footer-link:hover{color:var(--mint)}
.footer-link:hover::before{background:var(--mint);border-color:var(--mint)}

.index-roll{
  margin-top:clamp(1.6rem,3vw,2.2rem);
  border:1px solid var(--line-soft);
  background:linear-gradient(180deg,rgba(23,56,76,.5),rgba(13,36,54,.18));
  border-radius:var(--radius);
}

.index-roll-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:.85rem 1.1rem;
  border-bottom:1px solid var(--line-soft);
}

.index-roll-title{
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.2em;
  color:var(--mint);
}

.index-roll-toggle{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.4rem .8rem;
  border:1px solid var(--ink-700);
  border-radius:var(--radius);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.1em;
  cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}

.index-roll-toggle::before{
  content:"";
  width:7px;
  height:7px;
  background:var(--mint);
  border-radius:1px;
  transition:transform .22s var(--ease);
}

.index-roll-toggle:hover{color:var(--mint);border-color:var(--mint)}

.index-roll[data-collapsed] .index-roll-toggle::before{transform:scaleY(.3)}

.index-roll-list{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(15rem,1fr));
  gap:0 1.6rem;
  margin:0;
  padding:1rem 1.1rem;
  max-height:40rem;
  opacity:1;
  overflow:hidden;
  transition:max-height .3s var(--ease),opacity .24s var(--ease),padding .3s var(--ease);
}

.index-roll[data-collapsed] .index-roll-list{
  max-height:0;
  opacity:0;
  padding-block:0;
}

.roll-item{
  display:flex;
  align-items:baseline;
  gap:.65rem;
  padding:.42rem 0;
  font-size:.86rem;
  line-height:1.7;
  color:var(--mist);
  border-bottom:1px dashed var(--line-soft);
  animation:lamp-in .5s var(--ease) both;
  animation-delay:calc(var(--i,0) * 70ms);
}

.roll-num{
  flex:none;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--amber);
}

.roll-text{min-width:0}

@keyframes lamp-in{
  from{opacity:0;transform:translateY(6px)}
  to{opacity:1;transform:none}
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:.5rem 1.6rem;
  margin-top:1.5rem;
  padding-top:1.3rem;
  border-top:1px solid var(--line-soft);
  font-size:.76rem;
  line-height:1.8;
  color:var(--mist);
}

.footer-copy{letter-spacing:.02em}

.footer-meta{
  font-family:var(--font-mono);
  letter-spacing:.06em;
  color:rgba(168,184,196,.85);
}

.footer-contact{
  font-family:var(--font-mono);
  letter-spacing:.03em;
  color:rgba(168,184,196,.85);
}

/* ---------- 11. 响应式 ---------- */
@media (max-width:1120px){
  .brand-tagline{display:none}
  .nav-utility{display:none}
  .nav-link{padding:.55rem .48rem .72rem;font-size:.86rem}
  .nav-num{font-size:.6rem}
  .nav-link::after{left:.48rem;right:.48rem}
  .primary-nav{gap:.6rem}
}

@media (max-width:900px){
  :root{--shell:min(calc(100% - 2rem),1240px)}

  html{scroll-padding-top:6rem}

  .header-inner{padding-block:.68rem;gap:.75rem}

  .version-chip{display:none}

  .nav-toggle{display:inline-flex}

  .primary-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:block;
    gap:0;
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    opacity:0;
    background:linear-gradient(180deg,var(--ink-800),var(--ink-900));
    border-top:1px solid var(--line-soft);
    border-bottom:1px solid var(--ink-700);
    box-shadow:0 26px 48px rgba(0,0,0,.5);
    transition:max-height .32s var(--ease),opacity .22s var(--ease),visibility .32s;
  }

  .site-header[data-open] .primary-nav{
    max-height:calc(100vh - 4.6rem);
    overflow-y:auto;
    visibility:visible;
    opacity:1;
  }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:.45rem 0;
  }

  .nav-item{border-bottom:1px solid var(--line-soft)}

  .nav-link{
    padding:.92rem 1.35rem;
    font-size:1rem;
    gap:.7rem;
  }

  .nav-link::after{
    left:0;
    right:auto;
    top:0;
    bottom:0;
    width:3px;
    height:auto;
    background:linear-gradient(180deg,var(--coral),var(--mint));
    transform:scaleY(0);
    transform-origin:top center;
  }

  .nav-link:hover::after,
  .nav-link[aria-current="page"]::after{transform:scaleY(1)}

  .nav-utility{
    display:flex;
    margin:0;
    padding:1rem 1.35rem 1.15rem;
    border-left:0;
    border-top:1px solid var(--line-soft);
  }

  .site-header[data-open] .nav-toggle{
    border-color:var(--mint);
    color:var(--mint);
  }

  .site-header[data-open] .nav-toggle-bars > span:nth-child(1){transform:translateY(4.5px) 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(-4.5px) rotate(-45deg)}

  .grid--split{grid-template-columns:minmax(0,1fr)}

  .footer-top{grid-template-columns:minmax(0,1fr)}

  .section-head{gap:.5rem}

  .paper::after{display:none}
}

@media (max-width:560px){
  body{font-size:16px;line-height:1.8}

  h1{font-size:clamp(1.9rem,8vw,2.4rem)}

  .brand-mark{width:2.2rem;height:2.2rem;font-size:.66rem}
  .brand-name{font-size:1rem}

  .footer-links{grid-template-columns:minmax(0,1fr);gap:1.4rem}

  .index-roll-list{grid-template-columns:minmax(0,1fr);padding-inline:.9rem}

  .footer-bottom{flex-direction:column;align-items:flex-start;gap:.4rem}

  .btn{width:100%}
}

/* ---------- 12. 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-delay:0ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }

  .roll-item{opacity:1;transform:none}

  .skip-link{transition:none}
}