/* ===== 1. reset & tokens ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit}
a{color:inherit}

:root{
  --fog:#E6F0EB;
  --mist:#F4F9F6;
  --deep:#17423B;
  --lime:#B7F24A;
  --orange:#FF7A3D;
  --indigo:#162B4D;
  --dblue:#3E7FA3;
  --grey:#52645F;
  --ink:#0B1F1B;
  --glass:rgba(255,255,255,.62);
  --line:rgba(11,31,27,.16);
  --line-soft:rgba(11,31,27,.08);
  --rail-w:236px;
  --top-h:52px;
  --pad-gutter:18px;
  --r:14px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono","Roboto Mono",Menlo,Consolas,monospace;
}

body{
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.78;
  letter-spacing:.01em;
  color:var(--deep);
  background-color:var(--fog);
  background-image:
    radial-gradient(120% 80% at 100% 0%,rgba(183,242,74,.16) 0%,rgba(183,242,74,0) 46%),
    radial-gradient(90% 70% at 0% 100%,rgba(62,127,163,.10) 0%,rgba(62,127,163,0) 52%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}

/* ===== 2. 基础排版 ===== */
.kit-h1{font-size:clamp(34px,5vw,64px);line-height:1.08;letter-spacing:-.03em;font-weight:800;margin:0 0 .5em}
.kit-h2{font-size:clamp(24px,3vw,36px);line-height:1.2;letter-spacing:-.02em;font-weight:800;margin:0 0 .45em}
.kit-h3{font-size:clamp(18px,1.6vw,22px);line-height:1.38;letter-spacing:-.01em;font-weight:700;margin:0 0 .4em}
.kit-lead{font-size:clamp(16.5px,1.5vw,20px);line-height:1.72;margin:0 0 1em;max-width:46ch;color:#1d4f46}
.kit-text{margin:0 0 1em;max-width:58ch}
.kit-note{font-size:13.5px;line-height:1.68;color:var(--grey);margin:0;max-width:52ch}
.kit-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.kit-eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--grey);margin:0 0 14px}
.kit-eyebrow::before{content:"";width:26px;height:1px;background:var(--orange);flex:none}
.kit-eyebrow__num{color:var(--orange);font-weight:700;letter-spacing:.06em}

/* ===== 3. skip link ===== */
.kit-skip{
  position:fixed;left:14px;top:-70px;z-index:400;
  display:inline-block;padding:11px 18px;border-radius:10px;
  background:var(--deep);color:var(--mist);
  font-size:14px;font-weight:700;text-decoration:none;
  box-shadow:0 8px 24px rgba(11,31,27,.28);
  transition:top .18s ease;
}
.kit-skip:focus,.kit-skip:focus-visible{top:12px}

/* ===== 4. header 框架 ===== */
.kit-header{position:sticky;top:0;z-index:120;background:var(--mist);border-bottom:1px solid var(--line)}

.kit-topline{
  position:static;
  display:flex;align-items:center;gap:12px;
  padding:10px var(--pad-gutter);
  background:linear-gradient(90deg,rgba(244,249,246,.96),rgba(230,240,235,.9));
}
.kit-navbtn{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 13px;border:1px solid var(--line);border-radius:999px;
  background:rgba(255,255,255,.72);color:var(--deep);
  font-size:13px;font-weight:600;cursor:pointer;
  transition:background .18s ease,border-color .18s ease;
}
.kit-navbtn:hover{background:#fff;border-color:var(--deep)}
.kit-navbtn__bars{display:grid;gap:4px;width:16px;flex:none}
.kit-navbtn__bars span{display:block;height:1.5px;background:var(--deep);border-radius:2px;transition:transform .22s ease,opacity .22s ease}
.kit-navbtn[aria-expanded="true"]{background:var(--deep);border-color:var(--deep);color:var(--mist)}
.kit-navbtn[aria-expanded="true"] .kit-navbtn__bars span{background:var(--lime)}
.kit-navbtn[aria-expanded="true"] .kit-navbtn__bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
.kit-navbtn[aria-expanded="true"] .kit-navbtn__bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}
.kit-navbtn__txt{letter-spacing:.04em}

.kit-topline__idx{display:flex;align-items:baseline;gap:7px;min-width:0;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--grey)}
.kit-topline__num{color:var(--orange);font-weight:700;font-size:13px}
.kit-topline__num::after{content:"/";margin-left:7px;color:rgba(11,31,27,.28);font-weight:400}
.kit-topline__label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-transform:uppercase}

.kit-topline__cta{
  margin-left:auto;display:inline-flex;align-items:center;gap:7px;
  padding:7px 15px;border-radius:999px;
  background:var(--lime);color:var(--ink);
  font-size:13px;font-weight:700;text-decoration:none;white-space:nowrap;
  transition:transform .18s ease,box-shadow .18s ease;
}
.kit-topline__cta::after{content:"→";font-family:var(--font-mono);font-size:12px}
.kit-topline__cta:hover{transform:translateX(2px);box-shadow:0 6px 16px rgba(23,66,59,.2)}

.kit-rail{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  grid-template-areas:"brand switch" "nav nav" "foot foot";
  align-items:center;
  gap:10px 12px;
  padding:0 var(--pad-gutter) 12px;
  background:transparent;
}

.kit-brand{grid-area:brand;display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--deep);min-width:0}
.kit-brand__mark{
  display:grid;place-items:center;flex:none;
  width:36px;height:36px;border-radius:9px;
  background:var(--deep);color:var(--lime);
  font-family:var(--font-mono);font-size:13.5px;font-weight:700;letter-spacing:-.03em;
  box-shadow:inset 0 0 0 1px rgba(183,242,74,.4);
}
.kit-brand__text{display:flex;flex-direction:column;gap:1px;min-width:0}
.kit-brand__name{font-size:15.5px;font-weight:800;letter-spacing:-.01em;line-height:1.22;white-space:nowrap}
.kit-brand__sub{font-family:var(--font-mono);font-size:9px;letter-spacing:.14em;color:var(--grey);line-height:1.2;white-space:nowrap;text-transform:uppercase}

.kit-switch{
  grid-area:switch;
  display:inline-flex;gap:2px;padding:3px;
  background:rgba(23,66,59,.09);border-radius:999px;
}
.kit-switch__opt{
  display:inline-block;padding:5px 11px;border-radius:999px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--grey);text-decoration:none;white-space:nowrap;
  transition:background .2s ease,color .2s ease;
}
.kit-switch__opt:hover{background:rgba(255,255,255,.8);color:var(--deep)}
.kit-switch__opt.is-on{background:var(--deep);color:var(--mist);font-weight:700}

.kit-nav{grid-area:nav;display:none}
.kit-nav[data-open="true"]{display:block;padding-bottom:4px}
.kit-nav__list{display:grid;gap:2px}
.kit-nav__link{
  position:relative;display:flex;align-items:center;gap:10px;
  padding:9px 10px;border-radius:9px;
  color:var(--deep);text-decoration:none;font-size:15px;line-height:1.4;
  transition:background .18s ease,color .18s ease;
}
.kit-nav__num{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--grey);flex:none}
.kit-nav__txt{min-width:0}
.kit-nav__link:hover{background:rgba(23,66,59,.08)}
.kit-nav__link[aria-current="page"]{background:var(--lime);color:var(--deep);font-weight:700}
.kit-nav__link[aria-current="page"] .kit-nav__num{color:var(--ink)}
.kit-nav__link[aria-current="page"]::before{
  content:"";position:absolute;left:-12px;top:50%;
  width:10px;height:2px;background:var(--orange);transform:translateY(-50%);
}

.kit-rail__foot{grid-area:foot;display:none}
.kit-rail__note{margin:0;font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--grey);line-height:1.5}
.kit-rail__ticks{height:18px;margin:8px 0 0;border-radius:2px;background:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 9px)}

/* ===== 5. 桌面：固定左轨道 + 固定上边框 ===== */
@media (min-width:1024px){
  :root{--pad-gutter:40px}
  body{padding-left:var(--rail-w);padding-top:var(--top-h)}

  .kit-header{position:relative;background:transparent;border-bottom:0}

  .kit-topline{
    position:fixed;top:0;left:var(--rail-w);right:0;z-index:110;
    height:var(--top-h);padding:0 clamp(20px,3vw,36px);
    background:linear-gradient(90deg,rgba(244,249,246,.97),rgba(230,240,235,.88));
    border-bottom:1px solid var(--line);
    backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  }
  .kit-topline::after{
    content:"";position:absolute;left:0;right:0;bottom:-5px;height:4px;pointer-events:none;
    background:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 15px);
  }
  .kit-navbtn{display:none}

  .kit-rail{
    position:fixed;left:0;top:0;bottom:0;z-index:100;
    width:var(--rail-w);
    grid-template-columns:minmax(0,1fr);
    grid-template-rows:auto auto 1fr auto;
    grid-template-areas:"brand" "switch" "nav" "foot";
    align-items:start;
    gap:16px;
    padding:20px 16px 18px;
    background:linear-gradient(180deg,var(--mist) 0%,#EDF5F0 60%,var(--fog) 100%);
    border-right:1px solid var(--line);
    overflow-y:auto;
  }
  .kit-rail .kit-brand{width:100%}
  .kit-rail .kit-switch{width:100%;display:flex}
  .kit-switch__opt{flex:1;text-align:center}

  .kit-nav{display:block}
  .kit-nav[data-open="true"]{padding-bottom:0}
  .kit-nav__list{gap:2px}
  .kit-nav__link{padding:8px 10px;font-size:14.5px}

  .kit-rail__foot{display:block;align-self:end}
}

/* ===== 6. footer 索引板 ===== */
.kit-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  background:var(--mist);
  border-top:1px solid var(--line);
}
.kit-footer::before{
  content:"";display:block;height:5px;
  background:repeating-linear-gradient(90deg,var(--deep) 0 2px,transparent 2px 11px);
  opacity:.32;
}
.kit-footer__inner{max-width:1180px;margin-inline:auto;padding:clamp(30px,4.5vw,54px) var(--pad-gutter) 22px}
.kit-footer__grid{display:grid;gap:clamp(22px,3vw,38px);grid-template-columns:1fr}

.kit-footer__brand{min-width:0}
.kit-footer__mark{
  font-size:21px;font-weight:800;letter-spacing:-.02em;line-height:1.2;margin:0 0 10px;color:var(--deep);
  display:inline-block;padding-bottom:6px;border-bottom:2px solid var(--lime);
}
.kit-footer__line{margin:0 0 10px;font-size:14px;line-height:1.72;color:var(--grey);max-width:34ch}
.kit-footer__note{margin:0;font-size:12.5px;line-height:1.66;color:var(--grey);max-width:38ch}

.kit-footer__col{min-width:0}
.kit-footer__h{
  font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.18em;
  text-transform:uppercase;color:var(--orange);margin:0 0 12px;
}
.kit-footer__links{display:grid;gap:7px}
.kit-footer__links a{
  display:inline-block;font-size:14px;line-height:1.5;color:var(--deep);text-decoration:none;
  border-bottom:1px solid transparent;transition:border-color .18s ease,color .18s ease;
}
.kit-footer__links a:hover{border-color:var(--orange);color:var(--ink)}

.kit-footer__contact p{margin:0 0 6px;font-size:13.5px;line-height:1.6;color:var(--deep)}
.kit-footer__contact p:last-child{margin-bottom:0}
.kit-footer__contact .kit-footer__note{color:var(--grey);margin-top:10px;font-size:12.5px}

.kit-footer__base{
  margin-top:clamp(24px,3.5vw,40px);padding-top:16px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
}
.kit-footer__copy{margin:0;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;color:var(--grey);line-height:1.6}
.kit-footer__legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.kit-footer__legal a{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;color:var(--deep);
  text-decoration:none;border-bottom:1px solid transparent;transition:border-color .18s ease,color .18s ease;
}
.kit-footer__legal a:hover{border-color:var(--orange);color:var(--orange)}

@media (min-width:700px){
  .kit-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .kit-footer__brand{grid-column:span 2}
}
@media (min-width:1024px){
  .kit-footer__grid{grid-template-columns:1.5fr repeat(3,minmax(0,.85fr)) 1.35fr}
  .kit-footer__brand{grid-column:auto}
}

/* ===== 7. 容器 / 网格 / 区块 ===== */
.kit-container{width:100%;max-width:1180px;margin-inline:auto;padding-inline:var(--pad-gutter)}
.kit-section{padding-block:clamp(40px,6vw,80px)}
.kit-section--tight{padding-block:clamp(24px,3.4vw,44px)}
.kit-rule{height:1px;border:0;margin:0;background:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 12px)}

.kit-grid{display:grid;gap:clamp(16px,2vw,28px);grid-template-columns:repeat(12,minmax(0,1fr))}
.kit-span-4,.kit-span-6,.kit-span-8,.kit-span-12{grid-column:span 12}
@media (min-width:760px){
  .kit-span-4{grid-column:span 4}
  .kit-span-6{grid-column:span 6}
  .kit-span-8{grid-column:span 8}
}

/* ===== 8. 按钮 / 标签 / 面包屑 ===== */
.kit-btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:13px 23px;border-radius:999px;border:1px solid transparent;
  background:var(--lime);color:var(--ink);
  font-size:15px;font-weight:700;line-height:1.2;text-decoration:none;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease;
}
.kit-btn::after{content:"→";font-family:var(--font-mono);font-size:13px}
.kit-btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(23,66,59,.2)}
.kit-btn--ghost{background:transparent;border-color:var(--deep);color:var(--deep)}
.kit-btn--ghost:hover{background:rgba(23,66,59,.07);box-shadow:none}
.kit-btn--orange{background:var(--orange);color:var(--ink)}
.kit-btn--sm{padding:9px 16px;font-size:13.5px}

.kit-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:999px;
  background:rgba(23,66,59,.09);color:var(--deep);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.07em;line-height:1.5;
}
.kit-tag--lime{background:var(--lime);color:var(--ink)}
.kit-tag--orange{background:var(--orange);color:var(--ink)}

.kit-crumbs{margin:0 0 22px}
.kit-crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.07em;color:var(--grey)}
.kit-crumbs__list li{display:flex;align-items:center;gap:8px}
.kit-crumbs__list li+li::before{content:"/";color:rgba(11,31,27,.3)}
.kit-crumbs a{color:var(--deep);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .18s ease}
.kit-crumbs a:hover{border-color:var(--orange)}
.kit-crumbs__num{color:var(--orange);margin-right:5px;font-weight:700}

/* ===== 9. 材质卡片 ===== */
.kit-card{
  background:var(--mist);border:1px solid var(--line-soft);border-radius:var(--r);
  padding:clamp(18px,2.4vw,28px);
}
.kit-card--glass{
  background:var(--glass);
  border-color:rgba(255,255,255,.72);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
}
.kit-card--indigo{background:var(--indigo);border-color:rgba(255,255,255,.14);color:#EAF2F7}
.kit-card--indigo .kit-h1,.kit-card--indigo .kit-h2,.kit-card--indigo .kit-h3,.kit-card--indigo .kit-text,.kit-card--indigo .kit-lead{color:inherit}
.kit-card--indigo .kit-note,.kit-card--indigo .kit-eyebrow{color:rgba(234,242,247,.72)}
.kit-card--indigo .kit-eyebrow::before{background:var(--dblue)}

/* ===== 10. 图片容器基础规则 ===== */
.kit-media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--r);aspect-ratio:16/10;
  background:linear-gradient(145deg,#C9DDD3 0%,#E9F3EE 55%,#DDEBE4 100%);
}
.kit-media img{width:100%;height:100%;object-fit:cover}
.kit-media--tall{aspect-ratio:4/5}
.kit-media--wide{aspect-ratio:21/9}
.kit-media::after{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.4);
}
.kit-media__cap{
  position:absolute;left:12px;bottom:12px;z-index:2;
  padding:3px 9px;border-radius:5px;
  background:rgba(11,31,27,.74);color:#F4F9F6;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.09em;line-height:1.5;
}

/* ===== 11. 路径步骤 ===== */
.kit-steps{display:grid;gap:10px}
.kit-step{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:13px;align-items:start;
  padding:14px 16px;border-radius:12px;
  background:rgba(255,255,255,.56);border:1px solid var(--line-soft);
}
.kit-step__num{
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;letter-spacing:.05em;
  color:var(--ink);background:var(--lime);border-radius:6px;padding:2px 7px;line-height:1.7;
}
.kit-step__title{font-size:15.5px;font-weight:700;line-height:1.4;margin:0 0 2px}
.kit-step__desc{margin:0;font-size:13.5px;line-height:1.62;color:var(--grey)}

/* ===== 12. 分段切换 ===== */
.kit-tabs__list{display:flex;flex-wrap:wrap;gap:6px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.kit-tabs__tab{
  padding:8px 17px;border:1px solid transparent;border-radius:999px;
  background:rgba(23,66,59,.07);color:var(--deep);
  font-size:14px;font-weight:600;line-height:1.4;cursor:pointer;
  transition:background .2s ease,color .2s ease,transform .2s ease;
}
.kit-tabs__tab:hover{background:rgba(23,66,59,.13)}
.kit-tabs__tab[aria-selected="true"]{background:var(--deep);color:var(--mist)}
.kit-tabs__panel{padding-top:20px}
.kit-tabs__panel[hidden]{display:none}

/* ===== 13. 手风琴 ===== */
.kit-faq{border-top:1px solid var(--line)}
.kit-faq__item{border-bottom:1px solid var(--line)}
.kit-faq__q{
  display:flex;width:100%;align-items:center;justify-content:space-between;gap:18px;
  padding:16px 2px;background:none;border:0;text-align:left;
  font-size:15.5px;font-weight:700;line-height:1.5;color:var(--deep);cursor:pointer;
}
.kit-faq__q:hover{color:var(--ink)}
.kit-faq__icon{position:relative;width:14px;height:14px;flex:none}
.kit-faq__icon::before,.kit-faq__icon::after{
  content:"";position:absolute;background:var(--orange);border-radius:2px;transition:transform .22s ease;
}
.kit-faq__icon::before{left:0;right:0;top:6px;height:2px}
.kit-faq__icon::after{top:0;bottom:0;left:6px;width:2px}
.kit-faq__q[aria-expanded="true"] .kit-faq__icon::after{transform:scaleY(0)}
.kit-faq__a{padding:0 2px 18px}
.kit-faq__a[hidden]{display:none}
.kit-faq__a .kit-text{font-size:14.5px;color:var(--grey)}

/* ===== 14. 焦点 / 显现 / 动效降级 ===== */
:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:5px}
.kit-nav__link:focus-visible,.kit-switch__opt:focus-visible,.kit-btn:focus-visible,.kit-tabs__tab:focus-visible{outline:2px solid var(--orange);outline-offset:2px}

.has-js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease}
.has-js [data-reveal].is-in{opacity:1;transform:none}

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

@media (max-width:359px){
  .kit-topline__label{max-width:64px}
  .kit-topline__cta{padding:6px 11px;font-size:12px}
}