/* =========================================================
   爱赢 · 共享样式表 /assets/site.css
   堆叠面板 · 悬浮胶囊 · 框景刻度 · 黑白高对比
   ========================================================= */

/* ---------- 1. tokens ---------- */
:root{
  --ink:#0B0E11;
  --paper:#F6F6F4;
  --white:#FFFFFF;
  --steel-100:#E4E7EA;
  --steel-700:#2A2F36;
  --steel-500:#6C737C;
  --blue:#0F5BD8;
  --blue-deep:#0B47AC;
  --hot:#FF4A1C;
  --hot-deep:#E23A0F;
  --cyan:#0FB5AE;
  --navy:#101C2E;

  --line:rgba(11,14,17,.14);
  --line-soft:rgba(11,14,17,.08);
  --line-strong:rgba(11,14,17,.34);
  --line-dark:rgba(255,255,255,.16);
  --dark-muted:rgba(255,255,255,.58);

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

  --r-1:2px;
  --r-2:4px;
  --r-3:6px;

  --gutter:clamp(16px,4vw,72px);
  --maxw:1360px;
  --header-space:108px;

  --shadow-1:0 10px 28px rgba(11,14,17,.07);
  --shadow-2:0 20px 44px rgba(11,14,17,.18);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100%;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    linear-gradient(rgba(11,14,17,.038) 1px,transparent 1px),
    linear-gradient(90deg,rgba(11,14,17,.038) 1px,transparent 1px);
  background-size:48px 48px;
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
h1,h2,h3,h4{margin:0;font-family:var(--font-display);font-weight:900;line-height:1.24;letter-spacing:-.01em}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0 0 1em;padding-left:1.2em}
li{margin:0}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}
:focus-visible{outline:2px solid var(--hot);outline-offset:3px;border-radius:var(--r-1)}
[id]{scroll-margin-top:calc(var(--header-space) + 16px)}
@media (max-width:899px){:root{--header-space:86px}}

/* ---------- 3. 中文排版与文字工具 ---------- */
.t-h1{font-size:clamp(32px,4vw,56px);line-height:1.18}
.t-h2{font-size:clamp(26px,3vw,36px);line-height:1.24}
.t-h3{font-size:clamp(20px,2vw,24px);line-height:1.35}
.display-num{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(64px,8vw,144px);
  line-height:.92;
  letter-spacing:-.045em;
  font-variant-numeric:tabular-nums;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.muted{color:var(--steel-500)}
.prose{max-width:38em;font-size:17px;line-height:1.9;color:var(--steel-700)}
.prose h2{margin:1.6em 0 .5em;font-size:clamp(22px,2.4vw,30px)}
.prose h3{margin:1.4em 0 .4em;font-size:20px}
.prose li{margin-bottom:.4em}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 4. 布局容器与栅格 ---------- */
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.container--narrow{max-width:980px}
.site-main{padding-top:var(--header-space)}
#main-content{scroll-margin-top:0}
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}
.grid--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.stack{display:flex;flex-direction:column;gap:16px}
@media (max-width:1024px){
  .grid--7-5,.grid--8-4,.grid--5-7,.grid--4{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:760px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .grid{gap:16px}
}

/* ---------- 5. 章节节奏 ---------- */
.section{padding:clamp(48px,7vw,96px) 0}
.section--tight{padding:clamp(28px,4vw,56px) 0}
.section--dark{background:var(--ink);color:var(--white)}
.section--dark .section__eyebrow,
.section--dark .muted{color:var(--dark-muted)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px;margin-bottom:clamp(20px,3vw,36px);
}
.section__eyebrow{
  display:block;margin-bottom:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--steel-500);
}
.section__title{font-size:clamp(26px,3vw,36px);max-width:22em}

/* ---------- 6. 堆叠面板 ---------- */
.panel{
  position:relative;
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--r-3);
  padding:clamp(22px,3vw,36px);
  transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease;
}
.panel--hot:hover,.panel--hot:focus-within{border-color:var(--hot)}
.panel--blue:hover,.panel--blue:focus-within{border-color:var(--blue)}
.panel--cyan{border-left:3px solid var(--cyan)}
.panel--cyan:hover,.panel--cyan:focus-within{border-color:var(--cyan)}
.panel--ink{background:var(--navy);border-color:var(--line-dark);color:var(--white)}
.panel__label{
  position:absolute;top:-1px;left:-1px;z-index:2;
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;
  font-family:var(--font-mono);font-size:12px;line-height:1.5;letter-spacing:.14em;
  background:var(--steel-700);color:var(--white);
  border-radius:var(--r-3) 0 var(--r-2) 0;
}
.panel--hot .panel__label{background:var(--hot)}
.panel--cyan .panel__label{background:var(--cyan)}
.panel--blue .panel__label{background:var(--blue)}
.panel--ink .panel__label{background:var(--hot)}

/* ---------- 7. 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid var(--line);border-radius:var(--r-1);
  background:var(--white);color:var(--steel-700);
  font-family:var(--font-mono);font-size:12px;line-height:1.6;letter-spacing:.14em;
}
.tag--hot{background:var(--hot);border-color:var(--hot);color:var(--white)}
.tag--cyan{background:var(--cyan);border-color:var(--cyan);color:var(--white)}
.tag--blue{background:var(--blue);border-color:var(--blue);color:var(--white)}
.tag--steel{background:var(--steel-700);border-color:var(--steel-700);color:var(--white)}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:1px solid transparent;border-radius:999px;
  font-family:var(--font-body);font-size:15px;font-weight:500;line-height:1;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease;
}
.btn:hover{text-decoration:none}
.btn--sm{padding:8px 15px;font-size:13px}
.btn--hot{background:var(--hot);border-color:var(--hot);color:var(--white)}
.btn--hot:hover{background:var(--hot-deep);border-color:var(--hot-deep);color:var(--white)}
.btn--blue{background:var(--blue);border-color:var(--blue);color:var(--white)}
.btn--blue:hover{background:var(--blue-deep);border-color:var(--blue-deep);color:var(--white)}
.btn--ink{background:var(--ink);border-color:var(--ink);color:var(--white)}
.btn--ink:hover{background:var(--steel-700);border-color:var(--steel-700);color:var(--white)}
.btn--ghost{background:var(--white);border-color:var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:var(--ink);color:var(--ink)}
.btn--line{background:transparent;border-color:var(--line-dark);color:var(--white)}
.btn--line:hover{border-color:var(--white);color:var(--white)}

/* ---------- 9. 页头：三枚悬浮胶囊 ---------- */
.skip-link{
  position:fixed;left:18px;top:-70px;z-index:200;
  padding:10px 18px;border-radius:var(--r-2);
  background:var(--ink);color:var(--white);font-size:14px;text-decoration:none;
  transition:top .16s ease;
}
.skip-link:focus{top:14px;color:var(--white);text-decoration:none}

.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  padding:12px var(--gutter);
  background:transparent;
  transition:background-color .18s ease,box-shadow .18s ease,backdrop-filter .18s ease;
}
.site-header[data-scrolled]{
  background:rgba(246,246,244,.86);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  box-shadow:0 1px 0 var(--line);
}
.header-progress{
  position:absolute;left:0;bottom:0;height:2px;width:0;
  background:var(--hot);
  transition:width .1s linear;
}
.header-rail{
  display:flex;align-items:center;gap:10px;
  max-width:var(--maxw);margin:0 auto;
}

.brand{
  display:inline-flex;align-items:center;gap:10px;
  padding:7px 18px 7px 8px;
  background:var(--white);border:1px solid var(--line);border-radius:999px;
  color:var(--ink);text-decoration:none;
  transition:border-color .18s ease;
}
.brand:hover{border-color:var(--ink);text-decoration:none;color:var(--ink)}
.brand__mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:30px;height:30px;border-radius:50%;
  background:var(--ink);color:var(--white);
  font-family:var(--font-display);font-weight:900;font-size:15px;line-height:1;
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-family:var(--font-display);font-weight:900;font-size:17px;letter-spacing:.08em}
.brand__sub{font-size:11px;letter-spacing:.12em;color:var(--steel-500)}

.pill-nav{
  margin:0 auto;
  padding:5px;
  background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:999px;
  transition:opacity .16s ease,transform .16s ease,visibility .16s ease,border-color .18s ease;
}
.pill-nav__list{display:flex;align-items:center;gap:2px;margin:0;padding:0;list-style:none}
.pill-nav__item{display:flex}
.pill-nav__link{
  position:relative;display:block;
  padding:8px 14px;border-radius:999px;
  font-size:14px;letter-spacing:.04em;color:var(--steel-700);
  text-decoration:none;
  transition:color .16s ease,background-color .16s ease;
}
.pill-nav__link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:5px;height:1px;
  background:currentColor;
  transform:scaleX(0);transform-origin:left;
  transition:transform .16s ease;
}
.pill-nav__link:hover{color:var(--ink);background:var(--steel-100);text-decoration:none}
.pill-nav__link:hover::after{transform:scaleX(1)}
.pill-nav__link[aria-current="page"]{background:var(--ink);color:var(--white)}
.pill-nav__link[aria-current="page"]::after{transform:scaleX(0)}

.header-actions{display:flex;align-items:center;gap:8px}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 16px;
  background:var(--white);border:1px solid var(--line);border-radius:999px;
  font-size:13px;letter-spacing:.1em;color:var(--ink);cursor:pointer;
  transition:border-color .16s ease;
}
.nav-toggle:hover{border-color:var(--ink)}
.nav-toggle__bars{position:relative;width:16px;height:2px;border-radius:1px;background:currentColor;transition:background-color .16s ease}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:1px;
  background:currentColor;transition:transform .16s ease;
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

/* 移动端 */
@media (max-width:899px){
  .brand{padding:6px 14px 6px 6px}
  .brand__sub{display:none}
  .header-actions{margin-left:auto}
  .header-actions__query{display:none}
  .nav-toggle{display:inline-flex}
  .pill-nav{
    position:absolute;left:var(--gutter);right:var(--gutter);top:calc(100% + 8px);
    margin:0;padding:10px;border-radius:var(--r-3);
    box-shadow:var(--shadow-2);
    opacity:0;visibility:hidden;transform:translateY(-8px);pointer-events:none;
  }
  .pill-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto}
  .pill-nav__list{flex-direction:column;align-items:stretch}
  .pill-nav__link{padding:12px 14px;border-radius:var(--r-2);font-size:15px}
  .pill-nav__link::after{left:14px;right:auto;width:18px;bottom:7px}
}

/* 桌面端滚动收缩：只留品牌与报修按钮 */
@media (min-width:900px){
  .site-header[data-scrolled] .header-actions__query{display:none}
  .site-header[data-scrolled] .nav-toggle{display:inline-flex}
  .site-header[data-scrolled] .pill-nav{
    opacity:0;visibility:hidden;transform:translateY(-6px);pointer-events:none;
  }
  .site-header[data-scrolled] .pill-nav[data-open]{
    position:absolute;right:var(--gutter);top:calc(100% + 8px);
    margin:0;padding:10px;border-radius:var(--r-3);
    box-shadow:var(--shadow-2);
    opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto;
  }
  .site-header[data-scrolled] .pill-nav[data-open] .pill-nav__list{flex-direction:column;align-items:stretch}
  .site-header[data-scrolled] .pill-nav[data-open] .pill-nav__link{padding:11px 16px;border-radius:var(--r-2)}
}

/* ---------- 10. 页脚：深色堆叠面板 ---------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:var(--ink);color:var(--white);
}
.footer-stack{
  display:grid;gap:12px;
  max-width:var(--maxw);margin:0 auto;
  padding:clamp(32px,5vw,64px) var(--gutter) 28px;
}
.footer-panel{
  position:relative;
  padding:clamp(20px,2.6vw,32px);
  background:var(--navy);
  border:1px solid var(--line-dark);
  border-radius:var(--r-3);
}
.footer-panel--lead{background:linear-gradient(135deg,#101C2E 0%,#0C1522 62%,#131A20 100%)}
.footer-panel--contact{border-color:rgba(255,74,28,.34)}
.footer-label{
  display:inline-block;margin-bottom:14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--hot);
}
.footer-brandline{
  margin:0 0 20px;
  max-width:30em;
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(18px,2vw,24px);line-height:1.5;letter-spacing:.01em;
  color:var(--white);
}
.footer-note{margin:0;font-size:14px;line-height:1.8;color:var(--dark-muted);max-width:44em}
.footer-actions{display:flex;flex-wrap:wrap;gap:10px}

.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.footer-col__title{
  margin:0 0 14px;padding-bottom:12px;
  font-family:var(--font-mono);font-weight:700;font-size:13px;letter-spacing:.18em;
  color:var(--white);
  border-bottom:1px solid var(--line-dark);
}
.footer-list{margin:0;padding:0;list-style:none}
.footer-list__item{margin-bottom:2px}
.footer-link{
  display:inline-block;padding:5px 0;
  color:var(--dark-muted);font-size:15px;text-decoration:none;
  transition:color .16s ease;
}
.footer-link:hover{color:var(--white);text-decoration:underline;text-underline-offset:3px}
.footer-link[aria-current="page"]{color:var(--hot)}

.footer-contact{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px 24px;margin-bottom:18px}
.footer-contact__item{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;
  padding-top:12px;border-top:1px solid var(--line-dark);
}
.footer-contact__label{
  flex:0 0 100%;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  color:var(--dark-muted);
}
.footer-contact__value{font-size:16px;color:var(--white);line-height:1.5;overflow-wrap:anywhere}
.footer-contact__value--mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

.copy-btn{
  appearance:none;cursor:pointer;
  padding:4px 12px;border-radius:999px;
  background:transparent;border:1px solid var(--line-dark);
  font-size:12px;letter-spacing:.1em;color:var(--white);
  transition:border-color .16s ease,background-color .16s ease,color .16s ease;
}
.copy-btn:hover{border-color:var(--hot);background:rgba(255,74,28,.16);color:var(--white)}
.copy-btn[data-copied="true"]{border-color:var(--cyan);color:var(--cyan);background:rgba(15,181,174,.12)}

.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  padding-top:6px;
  font-size:13px;color:var(--dark-muted);
}
.footer-legal{display:flex;flex-wrap:wrap;gap:4px 18px;margin:0;padding:0;list-style:none}
.footer-legal__item{display:flex}
.footer-legal .footer-link{font-size:13px;padding:4px 0}
.footer-meta{display:flex;flex-wrap:wrap;gap:6px 20px;margin:0;font-size:13px}
.footer-icp,.footer-copyright{font-family:var(--font-mono);letter-spacing:.04em}

/* 页脚面板错位叠层（仅桌面） */
@media (min-width:900px){
  .footer-panel--lead{margin-right:clamp(0px,7%,96px)}
  .footer-panel--contact{margin-left:clamp(0px,7%,96px)}
  .footer-cols .footer-panel:nth-child(2){transform:translateY(8px)}
  .footer-cols .footer-panel:nth-child(3){transform:translateY(16px)}
}
@media (max-width:899px){
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .footer-contact{grid-template-columns:minmax(0,1fr)}
  .footer-base{flex-direction:column;align-items:flex-start}
}

/* ---------- 11. 框景与刻度 ---------- */
.frame{
  position:relative;
  padding:clamp(20px,3vw,44px);
  border:1px solid var(--line-strong);
  border-radius:var(--r-3);
}
.frame::before,.frame::after{
  content:"";position:absolute;width:20px;height:20px;border:2px solid var(--hot);
}
.frame::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.frame::after{bottom:-1px;right:-1px;border-left:0;border-top:0}
.scale-band{
  height:14px;
  border-bottom:1px solid var(--line);
  background-image:repeating-linear-gradient(90deg,var(--line-strong) 0 1px,transparent 1px 12px);
}
.section--dark .scale-band{border-color:var(--line-dark);background-image:repeating-linear-gradient(90deg,var(--line-dark) 0 1px,transparent 1px 12px)}

/* ---------- 12. 数据块 ---------- */
.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(40px,5vw,72px);line-height:1;letter-spacing:-.035em;
  font-variant-numeric:tabular-nums;
}
.stat__unit{font-size:.34em;letter-spacing:.06em;vertical-align:super;margin-left:4px}
.stat__label{font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;color:var(--steel-500)}
.section--dark .stat__label,.panel--ink .stat__label{color:var(--dark-muted)}

/* ---------- 13. 图片容器 ---------- */
.img-frame{
  position:relative;
  padding:10px;
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--r-3);
}
.img-frame__inner{
  position:relative;overflow:hidden;
  border-radius:var(--r-2);
  background:var(--ink);
  aspect-ratio:4/3;
}
.img-frame__inner img{
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.72) contrast(1.06);
}
.img-frame__inner::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.14);
}
.img-frame--grid .img-frame__inner::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.08) 1px,transparent 1px);
  background-size:32px 32px;
}
.img-frame--wide .img-frame__inner{aspect-ratio:16/9}
.img-frame--tall .img-frame__inner{aspect-ratio:3/4}
.img-frame__tag{position:absolute;top:10px;left:10px;z-index:3}
.img-frame__caption{margin:10px 2px 0;font-size:13px;line-height:1.7;color:var(--steel-500)}

/* ---------- 14. 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;gap:4px 10px;
  margin:0;padding:0;list-style:none;
  font-size:13px;letter-spacing:.04em;color:var(--steel-500);
}
.breadcrumb li{display:flex;align-items:center;gap:10px}
.breadcrumb li+li::before{content:"/";opacity:.5}
.breadcrumb a{color:var(--steel-500)}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb [aria-current="page"]{color:var(--ink);font-weight:500}

/* ---------- 15. 横向时间轴 ---------- */
.rail{
  display:flex;gap:16px;
  overflow-x:auto;overscroll-behavior-x:contain;
  padding:4px 4px 20px;
  scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;
}
.rail__item{flex:0 0 clamp(240px,30vw,340px);scroll-snap-align:start}
.rail::-webkit-scrollbar{height:8px}
.rail::-webkit-scrollbar-track{background:var(--steel-100);border-radius:999px}
.rail::-webkit-scrollbar-thumb{background:var(--steel-500);border-radius:999px}

/* ---------- 16. 密集索引列表 ---------- */
.index-list{margin:0;padding:0;list-style:none;border-top:1px solid var(--line)}
.index-list__item{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:8px 16px;
  padding:14px 4px;border-bottom:1px solid var(--line);
  transition:background-color .16s ease;
}
.index-list__item:hover{background:var(--steel-100)}
.index-list__item a{color:var(--ink)}
.index-list__item a:hover{color:var(--blue);text-decoration:none}
.index-list__no{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--steel-500)}

/* ---------- 17. 标签页 ---------- */
.tabs__list{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:22px;border-bottom:1px solid var(--line)}
.tabs__btn{
  appearance:none;cursor:pointer;
  padding:10px 18px;border:1px solid transparent;border-bottom:0;
  border-radius:var(--r-2) var(--r-2) 0 0;
  background:var(--steel-100);color:var(--steel-700);
  font-size:14px;letter-spacing:.04em;
  transition:background-color .18s ease,color .18s ease;
}
.tabs__btn:hover{background:var(--steel-100);color:var(--ink)}
.tabs__btn[aria-selected="true"]{background:var(--ink);color:var(--white)}
.tabs__panel{animation:none}
.tabs__panel[hidden]{display:none}

/* ---------- 18. 筛选条 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.filter-btn{
  appearance:none;cursor:pointer;
  padding:8px 16px;border:1px solid var(--line);border-radius:999px;
  background:var(--white);color:var(--steel-700);
  font-size:13px;letter-spacing:.08em;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease;
}
.filter-btn:hover{border-color:var(--ink);color:var(--ink)}
.filter-btn[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:var(--white)}

/* ---------- 19. 折叠问答 ---------- */
.disclosure{border-bottom:1px solid var(--line)}
.disclosure__trigger{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  width:100%;padding:20px 4px;
  background:none;border:0;cursor:pointer;text-align:left;
  font-family:var(--font-display);font-weight:900;font-size:clamp(17px,1.6vw,20px);line-height:1.5;
  color:var(--ink);
  transition:color .16s ease;
}
.disclosure__trigger:hover{color:var(--blue)}
.disclosure__sign{position:relative;flex:0 0 16px;width:16px;height:16px}
.disclosure__sign::before,
.disclosure__sign::after{
  content:"";position:absolute;left:0;top:7px;width:16px;height:2px;background:var(--hot);
  transition:transform .18s ease,opacity .18s ease;
}
.disclosure__sign::after{transform:rotate(90deg)}
.disclosure[data-open] .disclosure__sign::after{transform:rotate(0deg);opacity:0}
.disclosure__panel{padding:0 4px 22px;color:var(--steel-700);max-width:44em}

/* ---------- 20. 显现动画 ---------- */
html.js-ready [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .35s ease,transform .35s ease;
}
html.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 21. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js-ready [data-reveal]{opacity:1 !important;transform:none !important}
}