:root{
  --bg:#ffffff;
  --fg:#0f172a;
  --muted:#64748b;
  --primary:#1e40af;
  --primary-500:#3b82f6;
  --border:#e2e8f0;
  --surface:#f8fafc;
  --success:#16a34a;
  --warning:#d97706;
}
*{box-sizing:border-box}
html{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;line-height:1.6}
body{margin:0;background:var(--bg);color:var(--fg)}
.container{max-width:1100px;margin:0 auto;padding:0 1rem}
.site-header{border-bottom:1px solid var(--border);background:var(--bg);position:sticky;top:0;z-index:10}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand-link{display:flex;align-items:center;text-decoration:none;color:var(--fg);font-weight:600}
.logo-dot{width:12px;height:12px;border-radius:50%;background:var(--primary);display:inline-block;margin-right:.5rem}
.site-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:1rem}
.site-nav a{color:var(--fg);text-decoration:none;padding:.5rem .75rem;border-radius:.5rem}
.site-nav a:hover{background:var(--surface)}
.site-main{padding:2rem 1rem}
.site-footer{border-top:1px solid var(--border);background:var(--bg);margin-top:3rem}
.footer-inner{padding:1.5rem 0;color:var(--muted);font-size:.95rem}

.hero{padding:3rem 0 1rem;background:var(--surface);border:1px solid var(--border);border-radius:1rem;margin-bottom:1.5rem}
.hero-title{margin:0 0 .5rem 0;font-size:2rem}
.hero-subtitle{margin:0;color:var(--muted)}

.panel{display:grid;grid-template-columns:1fr;gap:1.25rem}
.login-card{background:var(--bg);border:1px solid var(--border);border-radius:1rem;padding:1.5rem;max-width:460px}
.login-card h2{margin-top:0}
.login-card #loginform p{display:flex;flex-direction:column;margin-bottom:1rem}
.login-card input[type="text"],
.login-card input[type="password"]{border:1px solid var(--border);border-radius:.75rem;padding:.65rem .8rem;font-size:1rem}
.login-card input[type="submit"]{background:var(--primary);color:white;border:none;border-radius:.75rem;padding:.7rem 1rem;cursor:pointer;font-weight:600}
.login-card input[type="submit"]:hover{background:var(--primary-500)}
.muted{color:var(--muted)}

.client-area .client-header{margin-bottom:1rem}
.client-panels{display:grid;grid-template-columns:1fr;gap:1rem}
@media (min-width: 1024px){
  .client-panels{grid-template-columns:repeat(3, 1fr)}
}
.card{background:var(--bg);border:1px solid var(--border);border-radius:1rem;padding:1rem}
.card h2{margin-top:0}

.periods-table{width:100%;border-collapse:separate;border-spacing:0;border:1px solid var(--border);border-radius:12px;overflow:hidden}
.periods-table th, .periods-table td{padding:.75rem;border-bottom:1px solid var(--border)}
.periods-table thead th{background:var(--surface);text-align:left}
.periods-table tr:last-child td{border-bottom:none}

.badge{display:inline-block;padding:.2rem .5rem;border-radius:999px;font-size:.85rem;border:1px solid var(--border)}
.badge.success{color:#065f46;border-color:#a7f3d0;background:#ecfdf5}
.badge.warning{color:#92400e;border-color:#fde68a;background:#fffbeb}

.btn{display:inline-block;text-decoration:none;border-radius:.75rem;padding:.5rem .8rem;border:1px solid var(--border)}
.btn-sm{padding:.4rem .6rem;font-size:.9rem}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-500);border-color:var(--primary-500)}
.btn-link{border:none;color:var(--primary)}

.submissions .submission{border:1px solid var(--border);border-radius:.75rem;padding:.75rem;margin-bottom:.5rem}
.submission-meta{display:flex;gap:.5rem;align-items:center;margin-bottom:.5rem}
.submission .files{margin:0;padding-left:1rem}