/* =========================================================
   BBIN中心 · /assets/site.css
   共享外壳：reset / tokens / 头部 / 页脚 / 通用组件
   ========================================================= */

/* ---------- 0. Tokens ---------- */
:root{
  --c-bg:#0B1030;
  --c-surface:#141A3F;
  --c-violet:#7C4DFF;
  --c-amber:#FFA028;
  --c-cyan:#38E1D0;
  --c-grey:#8C93AE;
  --c-white:#FFFFFF;
  --c-fog:#EDF0F8;
  --c-black:#05070F;
  --c-alert:#FF6B6B;

  --violet-12:rgba(124,77,255,.12);
  --violet-30:rgba(124,77,255,.30);
  --violet-55:rgba(124,77,255,.55);
  --amber-14:rgba(255,160,40,.14);
  --cyan-12:rgba(56,225,208,.12);
  --line:rgba(140,147,174,.20);
  --line-strong:rgba(140,147,174,.42);
  --text-soft:rgba(237,240,248,.82);

  --font-display:"Archivo Black","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Inter",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --step-1:.875rem;
  --step-2:1rem;
  --step-3:clamp(1.125rem,1.02rem + .5vw,1.25rem);
  --step-4:clamp(1.5rem,1.2rem + 1.4vw,1.75rem);
  --step-5:clamp(1.9rem,1.3rem + 2.4vw,2.5rem);
  --step-6:clamp(2.3rem,1.2rem + 4.4vw,3.5rem);

  --shell:1280px;
  --rail:320px;
  --gutter:clamp(1rem,3.2vw,2.5rem);
  --topbar-h:52px;
  --ease:cubic-bezier(.22,.8,.3,1);
}

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  background-color:var(--c-bg);
  background-image:
    radial-gradient(880px 520px at 90% -8%,rgba(124,77,255,.22),transparent 62%),
    radial-gradient(720px 460px at -10% 14%,rgba(56,225,208,.09),transparent 60%),
    repeating-linear-gradient(-12deg,rgba(140,147,174,.045) 0 1px,transparent 1px 110px);
  color:var(--c-white);
  font-family:var(--font-body);
  font-size:1rem;
  font-weight:500;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.14;
  letter-spacing:-.005em;
}
p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%}
strong{font-weight:700}
:focus-visible{outline:2px solid var(--c-amber);outline-offset:3px;border-radius:3px}

/* ---------- 2. 布局基座 ---------- */
.shell{
  width:min(var(--shell),100% - var(--gutter) * 2);
  margin-inline:auto;
}
#main-content{
  display:block;
  padding-top:clamp(1.75rem,4vw,3rem);
  scroll-margin-top:calc(var(--topbar-h) + 1rem);
}
.block{padding-block:clamp(2.5rem,6vw,4.5rem)}
.block--alt{background:var(--c-black)}
.block--tight{padding-block:clamp(1.5rem,3vw,2.5rem)}

.grid{display:grid;gap:clamp(1.25rem,2.6vw,2rem)}
.grid--2{grid-template-columns:1fr}
.grid--3{grid-template-columns:1fr}
.split{display:grid;gap:clamp(2rem,4vw,3.5rem);grid-template-columns:1fr}
@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .split{grid-template-columns:var(--rail) minmax(0,1fr)}
  .split--reverse{grid-template-columns:minmax(0,1fr) var(--rail)}
}

/* ---------- 3. 跳转链接与进度条 ---------- */
.skip-link{
  position:absolute;
  left:50%;
  top:0;
  z-index:200;
  transform:translate(-50%,-140%);
  padding:.7rem 1.3rem;
  background:var(--c-amber);
  color:var(--c-black);
  font-size:.875rem;
  font-weight:700;
  letter-spacing:.06em;
  border-radius:0 0 10px 10px;
  transition:transform .22s var(--ease);
}
.skip-link:focus-visible{transform:translate(-50%,0);outline-offset:-3px}

.scroll-progress{
  position:fixed;
  inset-inline:0;
  top:0;
  height:3px;
  z-index:150;
  pointer-events:none;
  background:rgba(5,7,15,.5);
}
.scroll-progress > span{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-violet) 55%,var(--c-amber));
}

/* ---------- 4. 顶栏：收藏条 + 常驻功能区 ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:90;
  background:rgba(5,7,15,.94);
  border-bottom:1px solid var(--line);
  transition:box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.topbar.is-stuck{
  box-shadow:0 18px 40px -26px rgba(5,7,15,1);
  border-bottom-color:var(--violet-55);
}
.topbar__inner{
  display:flex;
  align-items:center;
  gap:clamp(.6rem,2vw,1.4rem);
  min-height:var(--topbar-h);
  padding-block:.3rem;
}

.favorites{
  flex:1 1 auto;
  min-width:0;
  overflow-x:auto;
  overscroll-behavior-x:contain;
  scrollbar-width:thin;
  scrollbar-color:rgba(140,147,174,.45) transparent;
}
.favorites::-webkit-scrollbar{height:4px}
.favorites::-webkit-scrollbar-track{background:transparent}
.favorites::-webkit-scrollbar-thumb{background:rgba(140,147,174,.32);border-radius:99px}
.favorites__track{
  display:flex;
  align-items:center;
  gap:.45rem;
  width:max-content;
  padding-block:.15rem;
}
.fav-chip{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  white-space:nowrap;
  padding:.35rem .85rem .35rem .6rem;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(20,26,63,.7);
  color:var(--c-grey);
  font-size:.8125rem;
  font-weight:500;
  letter-spacing:.02em;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.fav-chip:hover,.fav-chip:focus-visible{
  color:var(--c-white);
  border-color:var(--violet-55);
  background:var(--violet-12);
}
.fav-chip__code{
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.08em;
  color:var(--c-cyan);
}

.util-dock{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:.5rem;
  padding:.28rem .35rem .28rem .7rem;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(20,26,63,.8);
  backdrop-filter:blur(10px);
}
.util-dock__status{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.1em;
  color:var(--c-cyan);
  white-space:nowrap;
}
.util-dock__switch{
  padding:.34rem .8rem;
  border-radius:999px;
  background:var(--c-amber);
  color:var(--c-black);
  font-size:.75rem;
  font-weight:700;
  letter-spacing:.03em;
  white-space:nowrap;
  transition:background-color .2s var(--ease),box-shadow .25s var(--ease);
}
.util-dock__switch:hover,.util-dock__switch:focus-visible{
  background:#FFB855;
  box-shadow:0 0 18px -2px rgba(255,160,40,.7);
}
@media (max-width:600px){
  .util-dock__status{display:none}
  .util-dock{padding:.26rem .3rem}
}

/* ---------- 5. 刊头与导航 ---------- */
.masthead{
  position:relative;
  z-index:55;
  background:rgba(11,16,48,.86);
  border-bottom:1px solid var(--line);
}
.masthead__inner{
  position:relative;
  display:grid;
  justify-items:center;
  gap:clamp(1rem,2.6vw,1.7rem);
  padding-block:clamp(1.3rem,3.2vw,2.1rem) clamp(.95rem,2.4vw,1.5rem);
  text-align:center;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
}
.brand__mark{
  width:14px;
  height:14px;
  flex:0 0 auto;
  background:var(--c-violet);
  clip-path:polygon(0 0,100% 0,100% 58%,58% 100%,0 100%);
}
.brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.85rem,1.05rem + 2.6vw,2.85rem);
  line-height:1;
  letter-spacing:.03em;
  color:var(--c-white);
}
.brand__note{
  align-self:center;
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--c-cyan);
}
.brand--sm{gap:.45rem}
.brand--sm .brand__name{font-size:1.35rem}
.brand--sm .brand__mark{width:11px;height:11px}

.nav{width:100%}
.nav__list{
  display:flex;
  align-items:center;
  justify-content:center;
  flex-wrap:wrap;
  gap:clamp(.4rem,2.2vw,2.1rem);
}
.nav__item{position:relative}
.nav__item::before{
  content:attr(data-index);
  position:absolute;
  left:50%;
  top:-.6rem;
  transform:translateX(-50%) rotate(-12deg);
  font-family:var(--font-mono);
  font-size:.5625rem;
  letter-spacing:.1em;
  color:var(--c-violet);
  opacity:0;
  transition:opacity .25s var(--ease),top .25s var(--ease);
  pointer-events:none;
}
.nav__item:hover::before,
.nav__item:has(.nav__link[aria-current="page"])::before{opacity:1;top:-.75rem}

.nav__link{
  position:relative;
  display:inline-block;
  padding:.35rem .15rem;
  font-size:1rem;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--c-grey);
  transition:color .22s var(--ease);
}
.nav__link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-.1rem;
  height:2px;
  background:var(--c-violet);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .3s var(--ease),background-color .3s var(--ease);
}
.nav__link:hover{color:var(--c-white)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--c-white);font-weight:700}
.nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--c-amber)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.6rem;
  justify-self:center;
  padding:.6rem 1.15rem;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:var(--c-surface);
  color:var(--c-white);
  font-size:.8125rem;
  font-weight:700;
  letter-spacing:.14em;
  transition:border-color .22s var(--ease),background-color .22s var(--ease);
}
.nav-toggle:hover{border-color:var(--violet-55);background:var(--violet-12)}
.nav-toggle__bars{display:grid;gap:5px;width:18px}
.nav-toggle__bars i{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .25s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child{transform:translateY(-3.5px) rotate(-45deg)}

@media (max-width:960px){
  .nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    z-index:60;
    padding:1rem var(--gutter) 1.5rem;
    background:var(--c-black);
    border-bottom:1px solid var(--violet-55);
    max-height:min(72vh,26rem);
    overflow-y:auto;
    visibility:hidden;
    opacity:0;
    transform:translateY(-.5rem);
    pointer-events:none;
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s;
  }
  .nav[data-open]{
    visibility:visible;
    opacity:1;
    transform:translateY(0);
    pointer-events:auto;
  }
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px solid var(--line)}
  .nav__item:last-child{border-bottom:0}
  .nav__item::before{
    left:auto;
    right:.3rem;
    top:50%;
    transform:translateY(-50%) rotate(-12deg);
    opacity:.55;
  }
  .nav__link{display:block;padding:.95rem .2rem;font-size:1.0625rem}
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{color:var(--c-amber)}
  .nav-toggle{display:inline-flex}
}

/* ---------- 6. 页脚 ---------- */
.foot{
  margin-top:clamp(3.5rem,8vw,7rem);
  background:var(--c-black);
  color:var(--c-grey);
  font-size:.9375rem;
  line-height:1.7;
}
.foot::before{
  content:"";
  display:block;
  height:1px;
  background:repeating-linear-gradient(90deg,var(--c-violet) 0 18px,transparent 18px 36px);
  opacity:.55;
}
.foot__grid{
  display:grid;
  gap:clamp(2rem,4vw,3.5rem);
  padding-block:clamp(2.4rem,5vw,3.6rem);
  grid-template-columns:1fr;
}
@media (min-width:760px){
  .foot__grid{grid-template-columns:1.2fr 1fr 1.1fr}
}
.foot__col{min-width:0}
.foot__pulse{
  display:flex;
  align-items:center;
  gap:.5rem;
  margin-top:1.05rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.08em;
  color:var(--c-cyan);
}
.foot__note{
  margin-top:.75rem;
  max-width:34ch;
  font-size:.875rem;
  color:var(--c-grey);
}
.foot__title{
  margin-bottom:.85rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--c-violet);
}
.foot__title--gap{margin-top:1.75rem}
.foot__links{
  display:grid;
  gap:.5rem;
  grid-template-columns:repeat(auto-fit,minmax(9rem,1fr));
}
.foot__links a{
  position:relative;
  display:inline-block;
  color:var(--c-grey);
  transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.foot__links a::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:0;
  height:1px;
  background:var(--c-amber);
  transition:width .22s var(--ease);
}
.foot__links a:hover{color:var(--c-white);padding-left:.9rem}
.foot__links a:hover::before{width:.6rem}

.foot__contact{display:grid;gap:.65rem}
.foot__contact li{
  display:grid;
  grid-template-columns:3.4rem minmax(0,1fr);
  gap:.6rem;
  align-items:baseline;
}
.foot__k{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  color:rgba(140,147,174,.75);
}
.foot__v{color:var(--text-soft);word-break:break-word}

.foot__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.75rem;
  padding-block:1.1rem 1.75rem;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.05em;
  color:var(--c-grey);
}
.foot__base-item{display:inline-flex;align-items:center;gap:.6rem}
.foot__base-item--end{color:rgba(140,147,174,.8)}

/* ---------- 7. 通用文字组件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--c-cyan);
}
.eyebrow::before{content:"";width:20px;height:1px;background:currentColor}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:.55rem 1.1rem;
  margin-bottom:clamp(1.25rem,3vw,2rem);
}
.section-head__title{font-size:var(--step-4);color:var(--c-white)}
.section-head__note{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.2em;
  color:var(--c-cyan);
  white-space:nowrap;
  transform:rotate(-12deg);
  transform-origin:left bottom;
}

.lede{
  max-width:62ch;
  font-size:clamp(1.05rem,1.5vw,1.25rem);
  line-height:1.8;
  color:var(--text-soft);
}

.prose{
  max-width:68ch;
  font-size:1.0625rem;
  line-height:1.85;
  color:var(--text-soft);
}
.prose > * + *{margin-top:1.05em}
.prose h2{font-size:var(--step-4);color:var(--c-white);margin-top:2.2em}
.prose h3{font-size:var(--step-3);color:var(--c-white);margin-top:1.8em}
.prose strong{color:var(--c-white)}
.prose a{color:var(--c-amber);text-decoration:underline;text-underline-offset:.22em}
.prose ul,.prose ol{padding-left:1.15rem}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.45em}
.prose li::marker{color:var(--c-violet)}

.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:var(--c-grey);
}
.crumbs li{display:flex;align-items:center;gap:.5rem}
.crumbs li + li::before{content:"/";color:rgba(140,147,174,.5)}
.crumbs a{transition:color .2s var(--ease)}
.crumbs a:hover{color:var(--c-white)}
.crumbs [aria-current="page"]{color:var(--c-white)}

.slash-rule{
  position:relative;
  height:0;
  border-top:1px dashed rgba(140,147,174,.32);
  margin-block:clamp(2rem,5vw,3.5rem);
}
.slash-rule::after{
  content:"";
  position:absolute;
  right:0;
  top:-1px;
  width:min(220px,32%);
  border-top:2px solid var(--c-violet);
  transform:rotate(-12deg);
  transform-origin:right center;
}

/* ---------- 8. 面板与媒体容器 ---------- */
.panel{
  background:var(--c-surface);
  border:1px solid var(--line);
  border-radius:10px;
  padding:clamp(1.25rem,3vw,1.75rem);
}
.panel--fog{
  background:var(--c-fog);
  border-color:transparent;
  color:#0B1030;
}
.panel--fog h2,.panel--fog h3,.panel--fog strong{color:#0B1030}
.panel--fog p{color:rgba(11,16,48,.78)}

.panel-cut{
  --cut:20px;
  position:relative;
  padding:clamp(1.25rem,3vw,2rem);
  background:var(--c-surface);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.panel-cut::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  height:3px;
  width:clamp(48px,24%,130px);
  background:var(--c-violet);
}

.media-frame{
  --cut:18px;
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 10;
  overflow:hidden;
  background-color:var(--c-surface);
  background-image:repeating-linear-gradient(-12deg,rgba(124,77,255,.18) 0 1px,transparent 1px 16px);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.media-frame img,
.media-frame__img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame__tag{
  position:absolute;
  left:1rem;
  bottom:1rem;
  z-index:2;
}

/* ---------- 9. 标签与状态点 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.18rem .55rem;
  border:1px solid transparent;
  border-radius:4px;
  font-size:.6875rem;
  font-weight:700;
  line-height:1.7;
  letter-spacing:.08em;
  white-space:nowrap;
}
.tag--mono{font-family:var(--font-mono);letter-spacing:.12em}
.tag--violet{color:#C9B6FF;border-color:var(--violet-55);background:var(--violet-12)}
.tag--amber{color:#FFD9A6;border-color:rgba(255,160,40,.5);background:var(--amber-14)}
.tag--cyan{color:#A8F4EC;border-color:rgba(56,225,208,.45);background:var(--cyan-12)}
.tag--alert{color:#FFC2C2;border-color:rgba(255,107,107,.5);background:rgba(255,107,107,.14)}

.dot{
  display:inline-block;
  width:7px;
  height:7px;
  flex:0 0 auto;
  border-radius:50%;
  background:var(--c-grey);
}
.dot--cyan{background:var(--c-cyan);box-shadow:0 0 0 3px rgba(56,225,208,.18)}
.dot--amber{background:var(--c-amber);box-shadow:0 0 0 3px rgba(255,160,40,.18)}
.dot--alert{background:var(--c-alert);box-shadow:0 0 0 3px rgba(255,107,107,.18)}

/* ---------- 10. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.8rem 1.5rem;
  border:1px solid transparent;
  border-radius:6px;
  font-family:var(--font-body);
  font-size:.9375rem;
  font-weight:700;
  letter-spacing:.05em;
  cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s var(--ease),
             color .2s var(--ease),border-color .2s var(--ease),box-shadow .25s var(--ease);
}
.btn--action{
  background:var(--c-amber);
  color:var(--c-black);
}
.btn--action:hover,.btn--action:focus-visible{
  background:#FFB855;
  box-shadow:0 0 26px -4px rgba(255,160,40,.65);
  transform:translateY(-2px);
}
.btn--ghost{
  background:transparent;
  border-color:var(--line-strong);
  color:var(--c-white);
}
.btn--ghost:hover,.btn--ghost:focus-visible{
  border-color:var(--c-violet);
  background:var(--violet-12);
  transform:translateY(-2px);
}
.btn--sm{padding:.5rem 1rem;font-size:.8125rem}

/* ---------- 11. 标签页与显现 ---------- */
.tabs{
  display:flex;
  flex-wrap:wrap;
  gap:.5rem;
  padding-bottom:.85rem;
  margin-bottom:clamp(1.25rem,3vw,1.9rem);
  border-bottom:1px solid var(--line);
}
.tab{
  padding:.5rem 1rem;
  border:1px solid var(--line);
  border-radius:999px;
  background:transparent;
  color:var(--c-grey);
  font-size:.875rem;
  font-weight:700;
  letter-spacing:.05em;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.tab:hover{color:var(--c-white);border-color:var(--line-strong)}
.tab[aria-selected="true"]{
  background:var(--c-violet);
  border-color:var(--c-violet);
  color:var(--c-white);
}
.panel-group[hidden]{display:none}

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

/* ---------- 12. 响应式与无障碍 ---------- */
@media (max-width:600px){
  .favorites__track{gap:.35rem}
  .fav-chip{padding:.3rem .7rem .3rem .5rem;font-size:.75rem}
  .foot__base{justify-content:flex-start}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .scroll-progress > span{transition:none}
}