*{box-sizing:border-box;margin:0;padding:0}
:root{--primary:#2563eb;--primary-dark:#1d4ed8;--bg:#f1f5f9;--card:#fff;--text:#0f172a;--muted:#64748b;--line:#e2e8f0;--danger:#ef4444;--success:#22c55e;--warning:#f59e0b}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
.topbar{background:var(--primary);color:#fff;padding:10px 20px;display:flex;align-items:center;gap:20px;position:sticky;top:0;z-index:100;min-height:48px}
.topbar .brand{font-weight:700;font-size:1.1rem;color:#fff;text-decoration:none}
.topbar nav{display:flex;align-items:center;gap:12px;margin-left:auto;flex-wrap:wrap}
.topbar nav a{color:#fff;text-decoration:none;font-size:0.9rem;border-bottom:2px solid transparent;padding:2px 0}
.topbar nav a:hover{border-bottom-color:#fff}
.topbar .who{font-size:0.85rem;color:rgba(255,255,255,0.7);margin-left:8px}
.container{max-width:960px;margin:0 auto;padding:24px 16px}
h1{font-size:1.5rem;margin-bottom:12px}
h2{font-size:1.2rem;margin:24px 0 8px}
p{margin-bottom:8px}
a{color:var(--primary)}
.muted{color:var(--muted);font-size:0.9rem}
.center{text-align:center}

/* alerts */
.alert{padding:10px 16px;border-radius:8px;margin-bottom:12px;font-size:0.9rem}
.alert-success{background:#dcfce7;color:#166534;border:1px solid #bbf7d0}
.alert-danger{background:#fee2e2;color:#991b1b;border:1px solid #fecaca}
.alert-warning{background:#fef3c7;color:#92400e;border:1px solid #fde68a}
.alert-info{background:#dbeafe;color:#1e40af;border:1px solid #bfdbfe}

/* buttons */
.btn-primary,.btn-ghost{display:inline-block;padding:10px 20px;border-radius:8px;text-decoration:none;font-weight:600;font-size:0.9rem;border:none;cursor:pointer;text-align:center}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-ghost{background:var(--card);color:var(--text);border:1px solid var(--line)}
.btn-ghost:hover{background:var(--bg)}
.full{width:100%;display:block}
.center{text-align:center}

/* hero */
.hero{text-align:center;padding:48px 16px}
.hero h1{font-size:2.2rem;margin-bottom:8px}
.hero .lead{font-size:1.05rem;color:var(--muted);margin-bottom:24px}
.cta-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* auth cards */
.auth-wrap{max-width:420px;margin:24px auto}
.auth-card{background:var(--card);padding:28px;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,0.08);margin-bottom:12px}
.auth-card h2{margin-top:0;margin-bottom:16px;text-align:center}
label{display:block;margin-bottom:12px;font-size:0.9rem;font-weight:500}
input[type=text],input[type=email],input[type=password],input[type=file]{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;margin-top:4px;font-size:0.95rem}
input:focus{outline:2px solid var(--primary);outline-offset:-1px}

/* stat grid */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px;margin-bottom:20px}
.stat{background:var(--card);border-radius:12px;padding:20px;text-align:center;box-shadow:0 1px 3px rgba(0,0,0,0.08)}
.stat .num{display:block;font-size:1.8rem;font-weight:700;color:var(--primary)}
.stat .lbl{font-size:0.85rem;color:var(--muted)}

/* tables */
.tbl{width:100%;border-collapse:collapse;background:var(--card);border-radius:8px;overflow:hidden;margin-bottom:16px}
.tbl th{padding:10px 12px;background:var(--bg);text-align:left;font-size:0.85rem;font-weight:600}
.tbl td{padding:10px 12px;border-top:1px solid var(--line);font-size:0.9rem}
.tbl tr.highlight{background:#dbeafe}
.tbl tr.highlight td{font-weight:600}

/* admin */
.admin-links{display:flex;gap:10px;flex-wrap:wrap}

/* footer */
.foot{text-align:center;padding:24px 16px;color:var(--muted);font-size:0.85rem;border-top:1px solid var(--line);margin-top:24px}