:root{
  --bg1:#0b0b18;
  --bg2:#15152c;
  --card:#1a1a36;
  --border:#2e2e58;
  --text:#e9e9f4;
  --title:#f2f2ff;
  --accent:#7c5cff;
  --accent2:#9d7cff;
  --link:#9d7cff;
  --link-hover:#c3b0ff;
}
[data-theme="light"]{
  --bg1:#f6f8ff;
  --bg2:#eef2fb;
  --card:#ffffff;
  --border:rgba(40,62,100,.13);
  --text:#142033;
  --title:#0d0820;
  --accent:#6c4df6;
  --accent2:#1fb9d6;
  --link:#6c4df6;
  --link-hover:#1fb9d6;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  background:linear-gradient(160deg,var(--bg1),var(--bg2));
  color:var(--text);
  line-height:1.7;
  min-height:100vh;
  transition:background .3s,color .3s;
}
a{color:var(--link);text-decoration:none;transition:color .2s}
a:hover{color:var(--link-hover);text-decoration:underline}
img{max-width:100%;display:block;border-radius:12px;object-fit:cover}
h1,h2,h3{color:var(--title);line-height:1.3}
h2{font-size:1.6rem;margin-bottom:1rem;position:relative;padding-left:14px}
h2::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:6px;height:1.2em;border-radius:4px;background:linear-gradient(var(--accent),var(--accent2))}
h3{font-size:1.1rem}
.container{max-width:1200px;margin:0 auto;padding:0 18px}
section{padding:56px 0}
/* progress bar */
#progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));z-index:2000;transition:width .1s}
/* header */
header{position:fixed;top:0;left:0;right:0;z-index:1500;background:rgba(20,20,44,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid transparent;transition:border-color .3s,box-shadow .3s}
[data-theme="light"] header{background:rgba(255,255,255,.78)}
header.scrolled{border-bottom:1px solid var(--border);box-shadow:0 6px 24px rgba(0,0,0,.28)}
.nav{display:flex;align-items:center;gap:18px;height:66px}
.logo{font-size:1.12rem;font-weight:800;color:var(--title);white-space:nowrap;display:flex;align-items:center;gap:8px}
.logo .dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));display:inline-block}
.nav-links{display:flex;gap:16px;margin-left:auto;flex-wrap:nowrap}
.nav-links a{font-size:.92rem;color:var(--text);white-space:nowrap}
.nav-links a:hover{color:var(--link-hover);text-decoration:underline}
.nav-right{display:flex;align-items:center;gap:10px;margin-left:14px}
.search-box{display:flex;align-items:center;background:var(--card);border:1px solid var(--border);border-radius:20px;padding:5px 12px}
.search-box input{background:transparent;border:none;outline:none;color:var(--text);width:120px;font-size:.88rem}
.search-box input::placeholder{color:var(--text);opacity:.55}
.btn{cursor:pointer;border:none;border-radius:20px;padding:8px 16px;font-size:.9rem;font-weight:600;font-family:inherit;transition:transform .2s,box-shadow .2s;display:inline-block;text-align:center}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(124,92,255,.45);text-decoration:none;color:#fff}
.btn-ghost{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--accent);color:var(--link-hover)}
.theme-btn{background:var(--card);border:1px solid var(--border);color:var(--text);border-radius:50%;width:38px;height:38px;cursor:pointer;font-size:1rem}
.hamburger{display:none;background:transparent;border:1px solid var(--border);color:var(--text);border-radius:10px;width:40px;height:38px;font-size:1.2rem;cursor:pointer}
@media(max-width:1024px){
  .nav-links{display:none;position:absolute;top:66px;left:0;right:0;flex-direction:column;background:var(--card);border-bottom:1px solid var(--border);padding:14px 20px;gap:12px}
  .nav-links.open{display:flex}
  .hamburger{display:block;margin-left:auto}
  .search-box{display:none}
  .nav-right{margin-left:0}
}
/* hero */
.hero{min-height:76vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:120px 18px 60px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(124,92,255,.28),transparent 70%);top:-120px;right:-100px;z-index:0}
.hero>*{position:relative;z-index:1}
.hero-logo{width:140px;height:140px;border-radius:32px;border:2px solid var(--border);box-shadow:0 12px 40px rgba(124,92,255,.35);margin-bottom:22px}
.hero h1{font-size:2.3rem;max-width:900px;margin-bottom:14px}
.hero .slogan{font-size:1.1rem;color:var(--accent2);font-weight:600;margin-bottom:16px}
.hero .intro{max-width:720px;font-size:.98rem;margin-bottom:26px;opacity:.95}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin-bottom:38px}
.stats{display:flex;gap:40px;flex-wrap:wrap;justify-content:center}
.stat b{display:block;font-size:1.7rem;color:var(--title)}
.stat span{font-size:.85rem;opacity:.85}
@media(max-width:640px){.hero h1{font-size:1.55rem}.stats{gap:22px}}
/* grids */
.grid{display:grid;gap:20px}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:1024px){.grid-4{grid-template-columns:repeat(3,1fr)}}
@media(max-width:760px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}.grid-2{grid-template-columns:1fr}}
@media(max-width:480px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;overflow:hidden;transition:transform .25s,border-color .25s,box-shadow .25s;position:relative}
.card:hover{transform:translateY(-6px);border-color:var(--accent);box-shadow:0 14px 32px rgba(124,92,255,.22)}
.card-body{padding:12px 14px 16px}
.card-body h3{margin-bottom:6px}
.meta{font-size:.8rem;opacity:.88;line-height:1.6}
.badge{position:absolute;top:10px;left:10px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;font-size:.72rem;padding:3px 10px;border-radius:12px;font-weight:600}
.badge-read{position:absolute;top:10px;right:10px;background:rgba(0,0,0,.62);color:#fff;font-size:.72rem;padding:3px 9px;border-radius:12px}
/* recommend */
.rec-card{display:flex;gap:18px;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:16px;align-items:center;transition:transform .25s,border-color .25s}
.rec-card:hover{transform:translateY(-4px);border-color:var(--accent)}
.rec-card img{width:150px;height:110px;flex-shrink:0}
.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.tag{font-size:.74rem;padding:2px 10px;border-radius:10px;border:1px solid var(--border);background:rgba(124,92,255,.12);color:var(--link)}
@media(max-width:640px){.rec-card{flex-direction:column;align-items:flex-start}.rec-card img{width:100%;height:170px}}
/* detail */
.detail-wrap{display:grid;grid-template-columns:280px 1fr;gap:26px}
.detail-side{background:linear-gradient(160deg,#1a1a36,#241f4d);border:1px solid var(--border);border-radius:18px;padding:28px;display:flex;flex-direction:column;justify-content:center}
[data-theme="light"] .detail-side{background:linear-gradient(160deg,#efeaff,#e3f3fb)}
.detail-side .num{font-size:4.4rem;font-weight:900;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.detail-side p{margin-top:12px;font-size:.95rem}
.detail-main p{margin-bottom:14px}
.detail-main h3{margin:18px 0 8px}
.feature-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:22px}
.feature-row span{border:1px solid var(--border);background:var(--card);padding:8px 16px;border-radius:20px;font-size:.86rem}
@media(max-width:860px){.detail-wrap{grid-template-columns:1fr}}
/* characters */
.char-card{display:flex;gap:16px;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:16px;align-items:flex-start;transition:transform .25s,border-color .25s}
.char-card:hover{transform:translateY(-4px);border-color:var(--accent)}
.char-card img{width:90px;height:90px;flex-shrink:0;border-radius:14px}
.char-role{font-size:.78rem;color:var(--accent2);font-weight:700;margin:2px 0 6px}
/* platform */
.platform-wrap{display:grid;grid-template-columns:1.4fr 1fr;gap:30px}
.steps{display:flex;flex-direction:column;gap:14px}
.step{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:14px 18px;display:flex;gap:14px;align-items:center}
.step b{font-size:1.5rem;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.mini-features{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:26px}
.mini-features div{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px;text-align:center;font-size:.9rem}
@media(max-width:860px){.platform-wrap{grid-template-columns:1fr}.mini-features{grid-template-columns:repeat(2,1fr)}}
/* sync */
.sync-wrap{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}
.sync-imgs{display:flex;gap:16px;justify-content:center}
.sync-imgs img{width:180px;height:290px}
@media(max-width:860px){.sync-wrap{grid-template-columns:1fr}.sync-imgs img{width:130px;height:210px}}
/* notice */
.notice-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px}
.notice-card time{font-size:.78rem;color:var(--accent2);font-weight:600}
.notice-card h3{margin:8px 0 6px}
/* guide */
.guide-wrap{display:grid;grid-template-columns:1.4fr 1fr;gap:30px}
.checklist{display:flex;flex-direction:column;gap:12px}
.checklist div{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px 16px;font-size:.92rem}
.checklist div::before{content:"✓ ";color:var(--accent2);font-weight:800}
@media(max-width:860px){.guide-wrap{grid-template-columns:1fr}}
/* app */
.app-center{text-align:center;max-width:760px;margin:0 auto}
.app-center p{margin-bottom:24px}
.app-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
/* comments */
.comment{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px}
.comment .c-head{display:flex;justify-content:space-between;font-size:.82rem;margin-bottom:8px}
.comment .c-head b{color:var(--title)}
.comment .c-head span{opacity:.8}
/* faq */
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:14px;margin-bottom:12px;overflow:hidden}
.faq-q{width:100%;text-align:left;background:transparent;border:none;color:var(--title);font-size:1rem;font-weight:600;padding:16px 18px;cursor:pointer;font-family:inherit;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"+";font-size:1.3rem;color:var(--accent2)}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s;padding:0 18px}
.faq-item.open .faq-a{max-height:320px;padding-bottom:16px}
/* sidebar layout */
.side-layout{display:grid;grid-template-columns:1fr 320px;gap:30px;align-items:start}
aside .side-box{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:18px;margin-bottom:20px;position:sticky;top:84px}
.rank-list{list-style:none}
.rank-list li{display:flex;gap:12px;align-items:center;padding:8px 0;border-bottom:1px dashed var(--border);font-size:.9rem}
.rank-list li:last-child{border-bottom:none}
.rank-num{width:22px;height:22px;flex-shrink:0;border-radius:6px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;font-size:.76rem;display:flex;align-items:center;justify-content:center;font-weight:700}
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.stat-grid div{background:rgba(124,92,255,.1);border:1px solid var(--border);border-radius:12px;padding:12px;text-align:center}
.stat-grid b{display:block;color:var(--title);font-size:1.15rem}
.stat-grid span{font-size:.76rem;opacity:.85}
@media(max-width:960px){.side-layout{grid-template-columns:1fr}aside .side-box{position:static}}
/* footer */
footer{border-top:1px solid var(--border);padding:48px 0 24px;margin-top:30px}
.foot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;margin-bottom:30px}
.foot-grid h3{font-size:1rem;margin-bottom:12px}
.foot-grid a{display:block;font-size:.88rem;margin-bottom:8px}
.foot-links{display:flex;gap:16px;flex-wrap:wrap;font-size:.84rem;margin-bottom:16px}
.copyright{font-size:.82rem;opacity:.85;line-height:1.9}
@media(max-width:760px){.foot-grid{grid-template-columns:repeat(2,1fr)}}
/* back to top */
#backTop{position:fixed;right:22px;bottom:26px;width:46px;height:46px;border-radius:50%;border:none;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;font-size:1.2rem;cursor:pointer;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s;z-index:1600;box-shadow:0 8px 22px rgba(124,92,255,.45)}
#backTop.show{opacity:1;visibility:visible}