:root{
  --bg:#f3f5f8;
  --panel:#ffffff;
  --text:#182235;
  --muted:#6e7787;
  --brand:#1d5fd1;
  --brand-dark:#164ba6;
  --nav:#101827;
  --line:#e3e8f0;
  --soft:#edf3ff;
  --green:#16845d;
  --shadow:0 14px 34px rgba(23,34,54,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,Arial,sans-serif;background:var(--bg);color:var(--text)}
a{text-decoration:none;color:inherit}
button,input,textarea,select{font:inherit}
.container{width:min(1180px,92%);margin:auto}
header{background:var(--nav);color:#fff;position:sticky;top:0;z-index:20}
.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{font-size:22px;font-weight:850;letter-spacing:.1px}
.logo span{color:#7ea9ff}
.menu{display:flex;align-items:center;gap:21px;color:#cbd5e5;font-size:15px}
.menu a:hover,.menu a.active{color:#fff}
.actions{display:flex;gap:10px}
.btn{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:10px;padding:12px 18px;font-weight:750;cursor:pointer}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark)}
.btn-light{background:#fff;color:#172239}
.btn-outline{border:1px solid var(--line);background:#fff;color:var(--text)}
.hero{background:linear-gradient(135deg,#101827 0%,#1c3158 60%,#2f65b9 100%);color:#fff;padding:78px 0 62px}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:42px;align-items:center}
.kicker{display:inline-block;padding:8px 12px;border:1px solid rgba(255,255,255,.22);border-radius:999px;color:#dbe7ff;font-size:14px;margin-bottom:18px}
h1{font-size:52px;line-height:1.08;margin:0 0 18px}
.hero p{font-size:18px;line-height:1.65;color:#d8e0ef;max-width:720px}
.hero-actions{display:flex;gap:12px;margin-top:28px}
.hero-card{padding:26px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.17);backdrop-filter:blur(10px);border-radius:20px}
.stat{display:flex;justify-content:space-between;align-items:center;padding:15px 0;border-bottom:1px solid rgba(255,255,255,.13)}
.stat:last-child{border-bottom:0}
.section{padding:58px 0}
.section-title{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px}
.section-title h2{font-size:32px;margin:0}
.section-title p{margin:8px 0 0;color:var(--muted)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
.category{padding:24px;transition:.2s}
.category:hover{transform:translateY(-3px)}
.icon{width:48px;height:48px;border-radius:12px;background:var(--soft);color:var(--brand);display:grid;place-items:center;font-size:24px;margin-bottom:16px}
.category h3{margin:0 0 8px}
.category p{color:var(--muted);line-height:1.55}
.meta{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:13px;margin-top:18px}
.breadcrumbs{padding:26px 0;color:var(--muted);font-size:14px}
.forum-layout{display:grid;grid-template-columns:1fr 310px;gap:24px}
.search{display:flex;gap:10px;margin-bottom:22px}
.search input{flex:1;border:1px solid var(--line);border-radius:10px;padding:13px 14px;background:#fff}
.list{overflow:hidden}
.topic-row{display:grid;grid-template-columns:1fr 105px 110px;gap:16px;padding:20px;border-bottom:1px solid var(--line);align-items:center}
.topic-row:last-child{border-bottom:0}
.topic-title{font-weight:800;margin-bottom:7px}
.topic-desc{color:var(--muted);font-size:14px}
.pill{font-size:12px;color:var(--brand);background:var(--soft);padding:5px 9px;border-radius:999px}
.count{text-align:center}
.count strong{display:block}
.sidebar{padding:22px;height:max-content}
.sidebar h3{margin-top:0}
.sidebar ul{list-style:none;padding:0;margin:0}
.sidebar li{padding:11px 0;border-bottom:1px solid var(--line);color:var(--muted)}
.post{padding:24px;display:grid;grid-template-columns:130px 1fr;gap:24px;margin-bottom:16px}
.author{text-align:center}
.avatar{width:68px;height:68px;border-radius:50%;background:#dce7fb;color:var(--brand);display:grid;place-items:center;font-weight:850;margin:auto auto 10px}
.author small{color:var(--muted)}
.post h3{margin:0 0 12px}
.post p{line-height:1.7;color:#39445a}
.reply-box{padding:24px}
.reply-box textarea{width:100%;min-height:140px;border:1px solid var(--line);border-radius:12px;padding:14px;resize:vertical}
.member{padding:22px;display:flex;gap:16px;align-items:center}
.member .avatar{margin:0;flex:0 0 auto}
.member h3{margin:0 0 6px}
.member p{margin:0;color:var(--muted);font-size:14px}
.form-wrap{max-width:620px;margin:30px auto}
.form-card{padding:30px}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-weight:700;margin-bottom:8px}
.form-group input,.form-group select{width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:10px;background:#fff}
.notice{padding:16px;border-radius:12px;background:#eef8f4;color:#256b51;margin-bottom:18px}
footer{margin-top:50px;background:var(--nav);color:#9eabc0;padding:34px 0}
.footer-row{display:flex;justify-content:space-between;gap:20px}
@media(max-width:880px){
  .hero-grid,.forum-layout,.grid-3,.grid-2{grid-template-columns:1fr}
  h1{font-size:40px}
  .menu{display:none}
  .topic-row{grid-template-columns:1fr}
  .count{text-align:left}
}
@media(max-width:560px){
  .hero{padding-top:52px}
  h1{font-size:34px}
  .hero-actions,.actions{flex-direction:column}
  .post{grid-template-columns:1fr}
  .author{display:flex;align-items:center;text-align:left;gap:12px}
  .avatar{margin:0}
}