*{box-sizing:border-box}
:root{
  --primary:#2563eb;--primary-600:#1d4ed8;--success:#059669;--danger:#b91c1c;
  --bg:#ffffff;--text:#111827;--muted:#6b7280;--line:#e5e7eb;--shadow:0 6px 18px rgba(0,0,0,.06);
  --radius:12px;--container:1200px
}
body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,"Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg)}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.nav{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:10}
.logo{width:28px;height:28px;margin-right:8px;border-radius:6px}
.brand{font-weight:700}
.nav-left{display:flex;align-items:center;gap:8px}
.nav-right{display:flex;align-items:center;gap:14px}
.nav-right a{color:#374151;text-decoration:none}
.nav-right a.disabled{pointer-events:none;opacity:.5}
.dropdown{position:relative}
.dropdown .menu{position:absolute;right:0;top:calc(100% + 6px);background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);min-width:180px;padding:6px;z-index:20}
.dropdown .menu .meta{padding:10px 12px;color:var(--muted);border-bottom:1px solid var(--line);margin-bottom:4px;font-size:12px}
.dropdown .menu a{display:block;padding:10px 12px;border-radius:8px;color:#374151;text-decoration:none}
.dropdown .menu a:hover{background:#f3f4f6}
.banner{background:linear-gradient(135deg,#1e3a8a 0%,#2563eb 60%,#38bdf8 100%);color:#fff;padding:72px 16px}
.banner-inner{max-width:var(--container);margin:0 auto;text-align:center;padding:0 24px}
.hero-title{font-size:42px;margin:0 0 10px}
.hero-sub{font-size:18px;color:#e5e7eb;margin:0}
.actions{display:flex;gap:12px;justify-content:center;margin-top:16px}
.btn{padding:12px 18px;border-radius:10px;border:1px solid var(--line);background:#f8fafc;color:#111;text-decoration:none;cursor:pointer;min-width:140px}
.btn.primary{background:var(--primary);color:#fff;border:none}
.btn.primary:hover{background:var(--primary-600)}
.btn.secondary{background:#10b981;color:#fff;border:none}
.btn.support{background:#f59e0b;color:#fff;border:none}
.btn.support:hover{background:#d97706}
.features{max-width:var(--container);margin:48px auto;padding:0 24px;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:18px;background:#fff;box-shadow:var(--shadow)}
.card .icon{font-size:22px;color:var(--primary);margin-bottom:8px}
.footer{margin-top:24px;padding:20px 16px;text-align:center;color:#6b7280;border-top:1px solid #e5e7eb}
.hidden{display:none}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center}
.modal.hidden{display:none!important}
.modal-content{background:#fff;border-radius:12px;padding:16px;min-width:280px;max-width:360px;position:relative;box-shadow:var(--shadow)}
.modal-content input{width:100%;height:36px;padding:0 10px;border:2px solid #9ca3af;border-radius:8px;margin:8px 0}
.modal-actions{display:flex;align-items:center;justify-content:space-between;margin-top:6px}
.close{position:absolute;right:12px;top:8px;cursor:pointer;font-size:24px;color:#6b7280;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:background-color 0.2s,color 0.2s;z-index:9999;background:red}
.close:hover{background-color:#f3f4f6;color:#374151}
.msg{margin-top:6px;color:#374151;min-height:20px}

/* Toast */
#toast{position:fixed;right:16px;bottom:16px;z-index:50}
#toast .toast-item{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);padding:10px 14px;border-radius:10px;margin-top:8px;min-width:200px;color:#111}
#toast .success{border-left:4px solid var(--success)}
#toast .error{border-left:4px solid var(--danger)}