:root {
  --navy: #1B2A47;
  --red: #DC2B2B;
  --gray: #555;
  --bg: #F4F5F7;
  --border: #E0E3E8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: #1b1b1b;
}

a { color: var(--navy); }

.topbar {
  background: var(--navy);
  color: #fff;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar .brand {
  font-weight: 800;
  letter-spacing: 1px;
  font-size: 18px;
}

.topbar nav a {
  color: #fff;
  text-decoration: none;
  margin-left: 20px;
  font-size: 14px;
  font-weight: 600;
  opacity: 0.9;
}
.topbar nav a:hover { opacity: 1; text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px;
}

.card {
  background: #fff;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 24px;
}

.btn {
  display: inline-block;
  background: var(--red);
  color: #fff;
  border: none;
  border-radius: 7px;
  padding: 10px 18px;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { opacity: 0.92; }
.btn.secondary {
  background: #fff;
  color: var(--navy);
  border: 1px solid var(--border);
}
.btn.danger { background: #991B1B; }

.input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 14px;
  margin-top: 4px;
}

label { display: block; font-size: 12px; font-weight: 600; color: var(--gray); margin-top: 14px; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; font-size: 14px; border-bottom: 1px solid var(--border); }
th { color: var(--gray); font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }

tr.overdue { background: #FEE2E2; }
tr.due-soon { background: #FEF3C7; }

.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 20px;
  text-transform: uppercase;
}
.badge.overdue { background: #991B1B; color: #fff; }
.badge.due-soon { background: #B45309; color: #fff; }
.badge.open { background: #E0E3E8; color: #333; }
.badge.paid { background: #16653422; color: #166534; }
.badge.closed { background: #37415133; color: #374151; }
.badge.type-po { background: var(--red); color: #fff; }
.badge.type-invoice { background: #15803D; color: #fff; }

.flash { padding: 10px 14px; border-radius: 7px; font-size: 14px; margin-bottom: 16px; }
.flash.success { background: #DCFCE7; color: #166534; }
.flash.error { background: #FEE2E2; color: #991B1B; }
.flash.info { background: #DBEAFE; color: #1E40AF; }

.stat-row { display: flex; gap: 16px; margin-bottom: 20px; }
.stat {
  flex: 1;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
}
.stat .num { font-size: 26px; font-weight: 800; color: var(--navy); }
.stat .lbl { font-size: 12px; color: var(--gray); text-transform: uppercase; }

.filters { margin-bottom: 16px; display: flex; gap: 10px; align-items: center; }
.filters a {
  text-decoration: none;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--gray);
}
.filters a.active { background: var(--navy); color: #fff; border-color: var(--navy); }

.page-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.page-head h1 { color: var(--navy); font-size: 22px; margin: 0; }

.login-wrap {
  min-height: 100vh;
  background: var(--gray);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.login-box {
  background: #fff;
  border-radius: 14px;
  padding: 36px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
}
.login-box h1 { color: var(--navy); font-size: 22px; font-weight: 800; letter-spacing: 1px; text-align: center; margin: 10px 0 2px; }
.login-box p.sub { text-align: center; color: #666; font-size: 14px; margin: 0 0 20px; }