:root{
  --bg:#F7F4FF;
  --bg-2:#FFFFFF;
  --tint:#EEF2FF;
  --card:#FFFFFF;
  --title:#1B1340;
  --text:#2F2A4A;
  --muted:#5B5678;
  --hint:#8B86A3;
  --brand:#7C3AED;
  --lilac:#A78BFA;
  --teal:#14B8A6;
  --coral:#F97316;
  --rose:#E11D48;
  --amber:#F59E0B;
  --indigo:#312E81;
  --line:rgba(124,58,237,.14);
  --shadow:0 16px 40px rgba(49,46,129,.10);
  --radius:22px;
  --max:1200px;
  --bar:1080px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.75;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--indigo)}
h1,h2,h3,h4{color:var(--title);line-height:1.28;margin:0 0 .6em}
p{margin:0 0 1em}
.wrap{width:min(var(--max),calc(100% - 32px));margin:0 auto}
.skip{
  position:absolute;left:-999px;top:0;background:#fff;padding:8px 12px;z-index:100
}
.skip:focus{left:12px;top:12px}

/* brand bar */
.brandbar-spacer{height:88px}
.brandbar{
  position:fixed;top:12px;left:50%;transform:translateX(-50%);
  width:min(var(--bar),calc(100% - 24px));
  height:64px;z-index:80;
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  background:rgba(255,255,255,.92);
  border:1px solid var(--line);
  border-radius:999px;
  box-shadow:var(--shadow);
  backdrop-filter:blur(16px);
  padding:6px 10px;
}
.bar-btn,.search-btn,.app-chip{
  width:44px;height:44px;min-width:44px;border:0;border-radius:50%;
  background:var(--tint);color:var(--indigo);cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;font-size:18px;
}
.bar-btn:hover,.search-btn:hover,.app-chip:hover{background:#E0E7FF}
.bar-btn:focus-visible,.search-btn:focus-visible,.nav-pill:focus-visible,.btn:focus-visible,.drawer-close:focus-visible{
  outline:3px solid var(--lilac);outline-offset:2px;
}
.bar-groups{display:flex;align-items:center;gap:6px;flex:1}
.bar-groups.right{justify-content:flex-end}
.nav-pill{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:44px;padding:0 14px;border-radius:999px;
  color:var(--text);font-size:14px;font-weight:600;white-space:nowrap;
}
.nav-pill:hover{background:var(--tint);color:var(--indigo)}
.nav-pill.is-on{
  border:1.5px solid var(--brand);color:var(--brand);background:#F5F3FF;
}
.brand-center{
  display:flex;align-items:center;justify-content:center;gap:8px;
  min-width:92px;flex-shrink:0;
}
.brand-center img{width:36px;height:36px;object-fit:contain}
.brand-word{
  font-weight:800;letter-spacing:.04em;color:var(--indigo);font-size:18px
}
.mobile-only{display:none}
.desk-only{display:flex}

/* main */
main{display:block;padding-bottom:40px}
.page-hero{
  padding:12px 0 28px;
}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  color:var(--brand);font-weight:700;font-size:13px;letter-spacing:.12em;
  text-transform:uppercase;margin-bottom:10px;
}
.h1{font-size:clamp(28px,4vw,46px);margin-bottom:14px}
.lead{font-size:18px;color:var(--muted);max-width:720px}
.article{max-width:820px}
.article p,.prose p{font-size:16px;color:var(--text)}
.section{padding:28px 0}
.section-head{margin-bottom:18px}
.section-head h2{font-size:clamp(22px,3vw,32px)}
.muted{color:var(--muted)}
.hint{color:var(--hint);font-size:14px}

.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:22px;
}
.img-slot,.media{
  background:linear-gradient(160deg,#EEF2FF,#F5F3FF 50%,#ECFEFF);
  border-radius:20px;min-height:180px;overflow:hidden;
}
.media img{width:100%;height:100%;object-fit:cover}
.ratio-wide{aspect-ratio:16/9}
.ratio-tall{aspect-ratio:4/5}
.ratio-sq{aspect-ratio:1/1}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:48px;padding:0 22px;border-radius:999px;font-weight:700;
  border:0;cursor:pointer;font-size:15px;
}
.btn-main{
  background:linear-gradient(135deg,#A78BFA 0%,#7C3AED 50%,#14B8A6 100%);
  color:#fff;
}
.btn-main:hover{color:#fff;filter:brightness(1.05)}
.btn-ghost{
  background:#fff;color:var(--indigo);border:1px solid var(--line);
}
.btn-ghost:hover{background:var(--tint);color:var(--indigo)}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}

.tag{
  display:inline-flex;align-items:center;gap:8px;
  min-height:36px;padding:0 12px;border-radius:999px;
  background:#fff;border:1px solid var(--line);font-size:13px;color:var(--muted)
}
.dot{width:8px;height:8px;border-radius:50%;display:inline-block}
.dot-p{background:var(--brand)}
.dot-t{background:var(--teal)}
.dot-c{background:var(--coral)}
.dot-r{background:var(--rose)}
.dot-a{background:var(--amber)}
.dot-i{background:var(--indigo)}

.grid-2{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:center}
.grid-2r{display:grid;grid-template-columns:.9fr 1.1fr;gap:24px;align-items:start}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.tags-track{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.tag-card{
  background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px 16px 18px;
}
.tag-card h3{font-size:16px;margin-bottom:6px}
.tag-card p{font-size:14px;color:var(--muted);margin:0 0 10px}

.split-num{display:grid;grid-template-columns:220px 1fr;gap:22px;align-items:start}
.num-list{list-style:none;margin:0;padding:0}
.num-list a{
  display:flex;align-items:center;gap:10px;min-height:48px;
  padding:8px 12px;border-radius:14px;color:var(--text);font-weight:700
}
.num-list a:hover,.num-list a.is-on{background:var(--tint);color:var(--indigo)}
.num{color:var(--brand);font-variant-numeric:tabular-nums}

.mosaic{display:grid;grid-template-columns:1.3fr .7fr;grid-template-rows:auto auto;gap:14px}
.mosaic .block:first-child{grid-row:1 / span 2}
.block{background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden}
.block .media{border-radius:0;min-height:160px}
.block .pad{padding:18px}
.block h3{font-size:20px}

.pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.board-wall{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.board-item{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px}
.board-item:nth-child(1),.board-item:nth-child(4){min-height:210px}
.board-item:nth-child(2){min-height:160px}
.folder-list{display:flex;flex-direction:column;gap:10px}
.folder{
  display:flex;gap:14px;align-items:flex-start;
  background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px
}
.folder-mark{
  width:44px;height:44px;border-radius:14px;background:var(--tint);
  display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0
}
.rank-row{display:grid;grid-template-columns:88px 1fr;gap:12px;align-items:start;margin-bottom:14px}
.rank-n{font-size:52px;font-weight:800;line-height:1;letter-spacing:-2px}
.c1{color:var(--brand)} .c2{color:var(--teal)} .c3{color:var(--coral)} .c4{color:var(--rose)} .c5{color:var(--amber)}

.axis{position:relative;padding-left:28px}
.axis::before{content:"";position:absolute;left:8px;top:8px;bottom:8px;width:2px;background:var(--line)}
.axis-item{position:relative;margin:0 0 18px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}
.axis-item::before{
  content:"";position:absolute;left:-24px;top:22px;width:12px;height:12px;border-radius:50%;
  background:var(--brand);border:3px solid #fff;box-shadow:0 0 0 2px var(--line)
}
.status{display:inline-block;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px;background:var(--tint);color:var(--indigo)}

.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.faq details{
  background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px 16px;margin-bottom:10px
}
.faq summary{cursor:pointer;font-weight:700;color:var(--title);min-height:28px}
.faq p{margin:.6em 0 0;color:var(--text)}

.index-list a{
  display:flex;justify-content:space-between;gap:12px;align-items:center;
  min-height:52px;padding:10px 0;border-bottom:1px solid var(--line);color:var(--text)
}
.index-list a:hover{color:var(--brand)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 18px}
.note-flag{font-size:13px;color:var(--coral);font-weight:700}

.legal h2{margin-top:1.4em}
.contact-box{display:grid;grid-template-columns:1fr 1fr;gap:12px}

/* footer */
.site-footer{
  background:#1B1340;color:#F4F0FF;padding:42px 0 28px;margin-top:40px
}
.site-footer a{color:#E9D5FF}
.site-footer a:hover{color:#fff}
.foot-brand{display:flex;align-items:center;gap:12px;margin-bottom:22px}
.foot-brand img{width:40px;height:40px;object-fit:contain;background:#fff;border-radius:12px}
.foot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.foot-grid h3{color:#fff;font-size:15px;margin-bottom:10px}
.foot-grid a{display:block;min-height:32px;font-size:14px;color:#D6C8FF}
.foot-note{margin-top:22px;color:#C4B5FD;font-size:14px}
.foot-copy{margin-top:10px;color:#A78BFA;font-size:13px}

/* overlay / drawer / search */
.mask{
  position:fixed;inset:0;background:rgba(27,19,64,.38);
  opacity:0;visibility:hidden;pointer-events:none;z-index:90;transition:opacity .2s
}
.mask.on{opacity:1;visibility:visible;pointer-events:auto}
body.lock{overflow:hidden}
.drawer{
  position:fixed;left:50%;bottom:0;transform:translate(-50%,110%);
  width:min(720px,100%);max-height:78vh;overflow:auto;
  background:#fff;border-radius:28px 28px 0 0;z-index:95;
  visibility:hidden;pointer-events:none;transition:transform .28s ease;
  padding:18px 18px 28px;box-shadow:var(--shadow)
}
.drawer.on{transform:translate(-50%,0);visibility:visible;pointer-events:auto}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.drawer-head img{width:36px;height:36px;object-fit:contain}
.drawer-close{
  width:44px;height:44px;border:0;border-radius:50%;background:var(--tint);cursor:pointer;font-size:20px
}
.drawer-group{margin:14px 0}
.drawer-group h3{font-size:13px;letter-spacing:.08em;color:var(--hint);margin-bottom:8px}
.drawer-link{
  display:block;padding:10px 12px;border-radius:16px;border:1px solid transparent
}
.drawer-link:hover{background:var(--tint);border-color:var(--line)}
.drawer-link strong{display:block;color:var(--title)}
.drawer-link span{display:block;font-size:13px;color:var(--muted)}

.search-layer{
  position:fixed;z-index:96;visibility:hidden;pointer-events:none;
}
.search-layer.on{visibility:visible;pointer-events:auto}
.search-card{
  background:#fff;border:1px solid var(--line);border-radius:24px;
  box-shadow:var(--shadow);padding:18px;width:min(640px,calc(100% - 24px))
}
.search-layer .search-box{
  width:100%;min-height:48px;border-radius:999px;border:1px solid var(--line);
  padding:0 16px;font-size:16px;background:var(--tint);color:var(--text)
}
.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.search-presets a{
  min-height:40px;display:inline-flex;align-items:center;padding:0 14px;
  border-radius:999px;background:var(--tint);color:var(--indigo);font-weight:600;font-size:14px
}

/* mobile island */
.island{
  display:none;position:fixed;left:50%;bottom:calc(12px + env(safe-area-inset-bottom));
  transform:translateX(-50%);z-index:70;
  width:min(420px,calc(100% - 28px));height:52px;
  background:rgba(255,255,255,.95);border:1px solid var(--line);border-radius:999px;
  box-shadow:var(--shadow);padding:4px 8px;
  align-items:center;justify-content:space-around;
}
.island a{
  flex:1;height:44px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  font-size:11px;color:var(--muted);font-weight:700;position:relative
}
.island a.is-on{color:var(--brand)}
.island a.is-on::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);margin-bottom:2px
}

@media (max-width:980px){
  .desk-only{display:none}
  .mobile-only{display:flex}
  .brandbar{width:calc(100% - 16px);padding:6px 8px}
  .grid-2,.grid-2r,.split-num,.pair,.mosaic,.contact-box{grid-template-columns:1fr}
  .mosaic .block:first-child{grid-row:auto}
  .tags-track,.grid-3,.grid-4,.board-wall,.steps,.foot-grid{grid-template-columns:1fr 1fr}
  .search-layer{
    inset:0;background:var(--bg);display:flex;flex-direction:column;padding:18px 16px
  }
  .search-card{width:100%;box-shadow:none;background:transparent;border:0;padding:8px 0}
  .island{display:flex}
  .site-footer{padding-bottom:96px}
  main{padding-bottom:88px}
}
@media (max-width:640px){
  .tags-track,.board-wall,.steps{grid-template-columns:1fr}
  .h1{font-size:28px}
  .rank-n{font-size:40px}
}
@media (min-width:981px){
  .search-layer{
    top:88px;left:50%;transform:translateX(-50%);width:min(640px,100%)
  }
}