* { margin: 0; padding: 0; box-sizing: border-box; }
:root { --bg:#f4f4f8; --white:#fff; --indigo:#4338ca; --dark:#1e1b4b; --text:#374151; --dim:#9ca3b8; --border:#e0e0ea; --green:#16a34a; --red:#dc2626; }
body { font-family:'Source Sans 3',sans-serif; background:var(--bg); color:var(--text); min-height:100vh; }
.container { max-width:800px; margin:0 auto; padding:0 20px; }
.flex-between { display:flex; align-items:center; justify-content:space-between; }
.h-56 { height:56px; }

.navbar { background:var(--dark); color:white; }
.brand { text-decoration:none; color:white; font-size:1.1rem; }
.brand i { color:#a5b4fc; margin-right:4px; }
.brand b { color:#a5b4fc; }
.nav-tag { font-size:0.7rem; color:#6366f1; letter-spacing:0.08em; background:rgba(99,102,241,0.1); padding:4px 10px; border-radius:4px; }

.content { padding:40px 0 60px; }
.intro { text-align:center; margin-bottom:28px; }
.intro h1 { font-size:2.2rem; font-weight:800; color:var(--dark); }
.hl { color:var(--indigo); }
.intro p { color:var(--dim); max-width:500px; margin:8px auto 0; font-size:0.95rem; }

.row-2 { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.card { background:var(--white); border:1px solid var(--border); border-radius:14px; padding:24px; margin-bottom:16px; }
.card h3 { font-size:1rem; font-weight:700; margin-bottom:14px; color:var(--dark); }
.card h3 i { color:var(--indigo); margin-right:6px; }
.card p { font-size:0.85rem; color:var(--dim); margin-bottom:10px; line-height:1.5; }
.card code { background:rgba(67,56,202,0.06); color:var(--indigo); padding:2px 6px; border-radius:3px; font-size:0.82rem; }
.card ul { margin:8px 0 0 18px; font-size:0.85rem; color:var(--dim); }
.card li { margin-bottom:4px; }
.card em { color:var(--indigo); font-style:normal; font-weight:600; }
.hint-card { border-left:3px solid var(--indigo); }

.card input, .card textarea { width:100%; padding:10px 14px; border:1px solid var(--border); border-radius:8px; margin-bottom:10px; font-family:inherit; font-size:0.9rem; outline:none; resize:vertical; }
.card input:focus, .card textarea:focus { border-color:var(--indigo); }
.btn { padding:10px 20px; background:var(--indigo); color:white; border:none; border-radius:8px; font-weight:600; cursor:pointer; font-family:inherit; font-size:0.85rem; }
.btn:hover { opacity:0.9; }
.admin-row { display:flex; gap:10px; }
.admin-row input { flex:1; margin-bottom:0; }

.flag-row { display:flex; gap:10px; }
.flag-row input { flex:1; margin-bottom:0; }
.ok { margin-top:12px; padding:10px; background:rgba(22,163,74,0.06); border:1px solid rgba(22,163,74,0.2); border-radius:8px; color:var(--green); font-size:0.85rem; word-break:break-all; }
.fail { margin-top:12px; padding:10px; background:rgba(220,38,38,0.06); border:1px solid rgba(220,38,38,0.2); border-radius:8px; color:var(--red); font-size:0.85rem; }

@media(max-width:700px) { .row-2{grid-template-columns:1fr;} .flag-row,.admin-row{flex-direction:column;} }