:root{
  --primary:#1867C0; --text:#111827; --muted:#4b5563;
  --bg:#f5f7fb; --surface:#ffffff; --border:#e5e7eb;
  --shadow:0 10px 26px rgba(17,24,39,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1200px;margin:0 auto;padding:0 18px}

/* Header */
.header{position:sticky;top:0;z-index:30;background:var(--surface);border-bottom:1px solid var(--border)}
.header .row{display:flex;align-items:center;justify-content:space-between;padding:12px 0;gap:12px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{height:36px}
nav{display:flex;gap:10px;flex-wrap:wrap}
nav a{padding:8px 12px;border:1px solid var(--border);border-radius:999px;background:#fff}
nav a.active, nav a:hover{border-color:#c7cdd5}

/* Hero */
.hero{padding:28px 0 12px}
h1{font-size:clamp(32px,4.8vw,52px);line-height:1.06;margin:6px 0 6px;font-weight:900;letter-spacing:-.2px}
.subtitle{color:var(--muted);max-width:900px}

/* Grid & Panels */
.grid{display:grid;grid-template-columns:1.05fr .95fr;gap:18px}
@media(max-width:980px){.grid{grid-template-columns:1fr}}
.panel{background:#fff;border:1px solid var(--border);border-radius:16px;padding:18px;box-shadow:var(--shadow)}
.section-title{font-weight:900;margin:8px 0 8px;font-size:22px}

.drop{border:2px dashed #cbd5e1;border-radius:14px;height:220px;display:grid;place-items:center;text-align:center;color:#6b7280;background:#fafafa;cursor:pointer;transition:.15s}
.drop:hover{background:#f8fafc}
.drop.dragover{border-color:var(--primary);background:#eef5ff}

.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 16px;border-radius:10px;font-weight:800;border:1px solid var(--primary);background:var(--primary);color:#fff;cursor:pointer}
.btn.secondary{background:#fff;border-color:#d1d5db;color:#111827}
.btn:disabled{opacity:.6;cursor:not-allowed}

.card{background:#fff;border:1px solid var(--border);border-radius:14px;padding:14px;margin-top:16px;box-shadow:var(--shadow)}

.meta{display:flex;gap:10px;flex-wrap:wrap;color:#6b7280;font-size:14px;margin-top:8px}
.tablewrap{max-height:300px;overflow:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:10px 8px;border-bottom:1px solid #eef2f7;font-size:14px;text-align:left}
th{color:#1f2937;font-weight:700}

.footer{margin:28px 0 50px;color:#6b7280;font-size:13px}

/* Ads */
.ad-slot{display:grid;place-items:center;border:1px dashed #cbd5e1;border-radius:12px;background:#fff;color:#9ca3af;height:90px;margin:10px 0}
@media(max-width:680px){.ad-slot{height:60px}}

/* Content pages */
.content{line-height:1.8;background:#fff;border:1px solid var(--border);border-radius:16px;padding:18px;box-shadow:var(--shadow)}
.content h2{margin-top:18px;font-size:26px}
.content h3{margin-top:14px;font-size:20px;color:#111827}
.content p{margin:10px 0}
.content ul, .content ol{padding-left:22px}

.kbd{border:1px solid var(--border);background:#f3f4f6;padding:0 6px;border-radius:6px;font-family:ui-monospace, SFMono-Regular, Menlo, monospace}
.callout{display:flex;gap:10px;align-items:flex-start;background:#f8fbff;border:1px solid #cfe0ff;border-radius:12px;padding:12px;margin:10px 0}