:root{--main:#3F4758;--accent:#91A9F0;--sec:#8C98A5;--bg:#F1F4F8;--line:#E1E6EF}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Segoe UI',Arial,sans-serif;background:var(--bg);color:#2B3140;line-height:1.65}
a{color:#4F6FD8;text-decoration:none}a:hover{text-decoration:underline}
.layout{display:flex;min-height:100vh}
.sidebar{width:290px;flex-shrink:0;background:var(--main);color:#C8D0DC;position:sticky;top:0;height:100vh;overflow-y:auto;padding:26px 0}
.brand{padding:0 22px 22px;border-bottom:1px solid rgba(255,255,255,.08)}
.brand .logo{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--accent),#5F7BD8);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:15px}
.brand b{color:#fff;font-size:15px;display:block}.brand small.slogan{display:block;color:#5E6983;font-size:10px;margin-bottom:10px;text-align:left}
.brand .row{display:flex;align-items:center;gap:10px}
.nav{list-style:none;padding:14px 10px}
.nav>li{margin:2px 0}
.nav a,.nav-head{display:flex;align-items:center;justify-content:space-between;width:100%;padding:9px 14px;border-radius:8px;color:#C8D0DC;font-size:14.5px;text-decoration:none;background:none;border:none;cursor:pointer;text-align:left;font-family:inherit}
.nav a:hover,.nav-head:hover{background:rgba(145,169,240,.14);color:#fff;text-decoration:none}
.nav a.active{background:var(--accent);color:#1B2130;font-weight:600}
.nav .chev{font-size:11px;opacity:.6;transition:transform .2s}
.nav-group.open .chev{transform:rotate(180deg)}
.sub{list-style:none;display:none;padding:4px 0 6px 14px;border-left:2px solid rgba(145,169,240,.35);margin-left:14px}
.nav-group.open .sub{display:block}
.sub a{padding:6px 10px;font-size:13.5px}
.sub a.active{background:var(--accent);color:#1B2130}
.content{flex:1;padding:34px 40px;max-width:1000px}
.topbar{display:none;background:var(--main);color:#fff;padding:12px 18px;position:sticky;top:0;z-index:10;align-items:center;gap:12px}
.burger{background:none;border:1px solid rgba(255,255,255,.3);color:#fff;border-radius:8px;padding:6px 10px;font-size:16px;cursor:pointer}
h1{color:var(--accent);font-size:30px;margin-bottom:18px;line-height:1.25}
h3{color:var(--sec);font-size:19px;margin:16px 0 8px}
.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px 26px;margin-bottom:18px;box-shadow:0 1px 3px rgba(31,42,64,.05)}
.panel p{margin:0 0 10px}
.panel ul{margin:6px 0 12px 22px}
.panel li{margin:3px 0}
.shot{margin:16px 0;text-align:center}
.shot img{max-width:100%;border:1px solid var(--line);border-radius:10px;box-shadow:0 2px 10px rgba(31,42,64,.08)}
.hero{background:linear-gradient(135deg,var(--main) 0%,#5A6B8C 100%);border:none;color:#fff;padding:44px 38px}
.hero h1{color:#fff;font-size:36px;margin-bottom:10px}
.hero .sub-line{color:var(--accent);font-weight:600;letter-spacing:.5px;margin-bottom:14px}
.hero p{color:#D7DDE8;max-width:640px;margin-bottom:22px}
.btn{display:inline-block;padding:11px 22px;border-radius:9px;font-weight:600;margin-right:10px;margin-top:6px}
.btn-accent{background:var(--accent);color:#1B2130}.btn-accent:hover{text-decoration:none;filter:brightness(1.07)}
.btn-ghost{border:1px solid rgba(255,255,255,.4);color:#fff}.btn-ghost:hover{background:rgba(255,255,255,.1);text-decoration:none}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:6px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 22px;box-shadow:0 1px 3px rgba(31,42,64,.05);transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-2px);box-shadow:0 6px 18px rgba(31,42,64,.1);text-decoration:none}
.card h3{margin:0 0 8px;font-size:17px;color:var(--accent)}
.card p{color:#5A6474;font-size:14px;margin:0}
.footer{margin-top:34px;color:var(--sec);font-size:13px;padding-top:14px;border-top:1px solid var(--line)}
@media(max-width:900px){
 .topbar{display:flex}
 .sidebar{position:fixed;left:0;top:0;transform:translateX(-100%);transition:transform .25s;z-index:20;height:100vh}
 .sidebar.show{transform:none}
 .content{padding:22px 16px}
 h1{font-size:24px}
}