:root{--ink:#172033;--muted:#7d8798;--line:#e7ebf2;--paper:#f6f8fc;--card:#fff;--accent:#635bff;--shadow:0 18px 50px rgba(35,45,80,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;color:var(--ink);background:var(--paper);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:14px}a{text-decoration:none;color:inherit}button{font:inherit}
.site-header{position:sticky;top:0;z-index:20;background:rgba(246,248,252,.86);border-bottom:1px solid rgba(224,229,239,.8);backdrop-filter:blur(18px)}.nav-shell{width:min(1200px,calc(100% - 48px));height:76px;margin:auto;display:flex;align-items:center;gap:42px}.brand{display:flex;align-items:center;gap:11px;min-width:210px}.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;color:#fff;font-size:19px;font-weight:800;background:linear-gradient(135deg,var(--accent),#9c72ff);box-shadow:0 8px 18px rgba(99,91,255,.25)}.brand-copy{display:flex;flex-direction:column;line-height:1.15}.brand-copy strong{font-size:16px;letter-spacing:.04em}.brand-copy small{margin-top:5px;color:#9aa3b3;font-size:8px;font-weight:700;letter-spacing:.2em}.main-nav{display:flex;align-items:center;gap:7px;flex:1}.nav-item{position:relative;padding:10px 14px;color:#7b8494;font-size:13px;font-weight:600;transition:color .2s}.nav-item:hover,.nav-item.active{color:var(--ink)}.nav-item.active:after{content:"";position:absolute;left:14px;right:14px;bottom:0;height:3px;border-radius:3px;background:var(--accent)}.header-actions{display:flex;align-items:center;gap:18px;color:#8d96a5;font-size:12px;white-space:nowrap}.online-status{display:flex;align-items:center;gap:7px}.online-status i{width:7px;height:7px;border-radius:50%;background:#45d39c;box-shadow:0 0 0 4px rgba(69,211,156,.13)}.theme-toggle{width:32px;height:32px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);cursor:pointer;transition:transform .2s,box-shadow .2s}.theme-toggle:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(35,45,80,.1)}
.footer-ul{position:fixed;z-index:15;bottom:0;left:0;width:100%;height:58px;background:rgba(255,255,255,.9);border-top:1px solid var(--line);backdrop-filter:blur(15px)}.footer-inner{width:min(1200px,calc(100% - 48px));height:100%;margin:auto;display:flex;align-items:center;justify-content:flex-end;gap:20px;color:#a0a8b6;font-size:11px}.footer-inner span{margin-right:auto}.footer-inner a{color:#788296}.footer-inner a:hover{color:var(--accent)}
.page-shell{width:min(1200px,calc(100% - 48px));margin:0 auto;padding:46px 0 126px}.page-hero{position:relative;overflow:hidden;padding:40px 48px;border-radius:25px;background:linear-gradient(115deg,#1e2541,#45418a);box-shadow:0 22px 55px rgba(36,41,78,.16);color:#fff}.page-hero:after{content:"";position:absolute;width:320px;height:320px;right:7%;top:-160px;border:1px solid rgba(170,183,255,.23);border-radius:50%;box-shadow:0 0 0 45px rgba(170,183,255,.05),0 0 0 90px rgba(170,183,255,.04)}.page-hero>*{position:relative;z-index:1}.page-kicker{margin:0;color:#aab6e5;font-size:10px;font-weight:800;letter-spacing:.2em}.page-hero h1{margin:14px 0 8px;font-size:32px;letter-spacing:-.04em}.page-hero p:last-child{margin:0;max-width:620px;color:#c6cce0;font-size:13px;line-height:1.8}.content-card{margin-top:24px;padding:28px;border:1px solid var(--line);border-radius:20px;background:var(--card);box-shadow:var(--shadow)}.content-heading{display:flex;align-items:end;justify-content:space-between;margin-bottom:22px}.content-heading h2{margin:7px 0 0;font-size:20px;letter-spacing:-.03em}.content-heading>p{margin:0;color:var(--muted);font-size:12px}.soft-dark .page-hero{background:linear-gradient(115deg,#252b4a,#45418a)}
.soft-dark{--ink:#edf1ff;--muted:#9ca6be;--line:#343b5a;--paper:#171b2d;--card:#202640;--shadow:0 18px 50px rgba(0,0,0,.18)}.soft-dark .site-header,.soft-dark .footer-ul{background:rgba(23,27,45,.88)}.soft-dark .theme-toggle{background:#202640;color:#edf1ff;border-color:#343b5a}.soft-dark .nav-item:hover,.soft-dark .nav-item.active{color:#fff}
@media(max-width:900px){.nav-shell,.footer-inner{width:min(100% - 32px,720px)}.nav-shell{gap:15px}.brand{min-width:auto}.brand-copy small,.online-status{display:none}.main-nav{justify-content:flex-end}.nav-item{padding:10px 8px;font-size:12px}.nav-item.active:after{left:8px;right:8px}.page-shell{width:min(100% - 32px,720px)}.page-hero{padding:34px}}
@media(max-width:600px){.nav-shell{height:65px}.brand-mark{width:34px;height:34px;border-radius:10px}.brand-copy strong{font-size:14px}.main-nav{gap:0}.nav-item{padding:8px 5px;font-size:11px}.nav-item.active:after{left:5px;right:5px}.header-actions{display:none}.footer-inner{justify-content:center;gap:11px;font-size:10px}.footer-inner span{display:none}.page-shell{width:calc(100% - 24px);padding:24px 0 100px}.page-hero{padding:28px 23px;border-radius:20px}.page-hero h1{font-size:28px}.content-card{padding:16px;border-radius:16px}.content-heading{display:block;margin-bottom:10px}.content-heading>p{margin-top:7px;line-height:1.6}}