:root{--brand:#4f46e5;--brand-d:#4338ca;--bg:#f6f7fb;--card:#fff;--tx:#1f2430;--mut:#6b7280;--bd:#e5e7eb;--ok:#16a34a;--warn:#d97706;--bad:#dc2626}
*{box-sizing:border-box}body{margin:0;font:16px/1.55 Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--tx);background:var(--bg)}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}
.nav{background:#fff;border-bottom:1px solid var(--bd);position:sticky;top:0;z-index:5}.nav .in{max-width:1040px;margin:auto;padding:14px 20px;display:flex;align-items:center;gap:22px}
.logo{font-weight:800;font-size:19px;color:var(--tx)}.logo span{color:var(--brand)}.nav .sp{flex:1}.nav a.l{color:var(--tx);font-weight:500;font-size:15px}
.btn{display:inline-block;background:var(--brand);color:#fff!important;border:0;border-radius:8px;padding:10px 18px;font:600 15px inherit;cursor:pointer;text-decoration:none!important}.btn:hover{background:var(--brand-d)}
.btn.ghost{background:#fff;color:var(--brand)!important;border:1px solid var(--bd)}
.hero{background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;padding:60px 20px;text-align:center}.hero h1{margin:0 0 8px;font-size:34px}.hero p{margin:0 0 22px;opacity:.9}
.search{max-width:560px;margin:auto;display:flex;gap:8px}.search input{flex:1;padding:14px 16px;border-radius:10px;border:0;font-size:16px}
.wrap{max-width:1040px;margin:auto;padding:28px 20px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--bd);border-radius:12px;padding:20px}.card h3{margin:0 0 6px}.card p{margin:0;color:var(--mut);font-size:14px}
.card.hover:hover{border-color:var(--brand);box-shadow:0 4px 18px rgba(79,70,229,.1);text-decoration:none}
label{display:block;font-weight:600;margin:14px 0 5px;font-size:14px}input[type=text],input[type=email],textarea,select{width:100%;padding:11px 12px;border:1px solid var(--bd);border-radius:8px;font:inherit;background:#fff}
textarea{min-height:150px;resize:vertical}.err{background:#fef2f2;color:var(--bad);padding:10px 14px;border-radius:8px;margin-bottom:10px}.ok{background:#f0fdf4;color:var(--ok);padding:10px 14px;border-radius:8px;margin-bottom:10px}
.pill{display:inline-block;padding:2px 10px;border-radius:99px;font-size:12px;font-weight:700;text-transform:uppercase;background:#eef2ff;color:var(--brand)}
.pill.resolved,.pill.closed{background:#f0fdf4;color:var(--ok)}.pill.pending{background:#fffbeb;color:var(--warn)}
.msg{border:1px solid var(--bd);border-radius:10px;padding:14px 16px;margin:12px 0;background:#fff}.msg.agent{background:#eef2ff;border-color:#c7d2fe}.msg .who{font-size:13px;color:var(--mut);margin-bottom:6px}.msg .b{white-space:pre-wrap}
.article{background:#fff;border:1px solid var(--bd);border-radius:12px;padding:28px 32px}.article h2{margin-top:0}.article code{background:#f3f4f6;padding:1px 6px;border-radius:4px}
.crumbs{font-size:14px;color:var(--mut);margin-bottom:12px}.demo{background:#fef9c3;color:#854d0e;text-align:center;font-size:13px;padding:5px}
footer{text-align:center;color:var(--mut);font-size:13px;padding:30px}.sugg{background:#eef2ff;border-radius:8px;padding:10px 14px;margin-top:10px;font-size:14px;display:none}
@media(max-width:600px){.hero h1{font-size:26px}.article{padding:18px}.nav .in{gap:12px;flex-wrap:wrap}}