/* Payment Tracker - Minimal Clean Styles */

:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1a1a2e;
  --muted: #6c757d;
  --primary: #2d6cdf;
  --primary-hov: #1b4fbf;
  --danger: #dc3545;
  --danger-hov: #b02a37;
  --warning: #f0ad4e;
  --success: #28a745;
  --border: #dee2e6;
  --shadow: 0 2px 6px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* Navbar */
.navbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand { font-weight: 700; font-size: 1.1rem; }

.nav-links a {
  margin-left: 1rem;
  text-decoration: none;
  color: var(--primary);
  font-size: 0.9rem;
}

.nav-links a:hover { text-decoration: underline; }

/* Container */
.container {
  max-width: 1100px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

/* Login box */
.login-box {
  max-width: 360px;
  margin: 4rem auto;
  background: var(--card);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.login-box h2 { margin-top: 0; text-align: center; }

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.35rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.95rem;
  background: var(--card);
  color: var(--text);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(45,108,223,0.15);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--card);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s;
}

.btn:hover { background: #f1f3f5; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover { background: var(--primary-hov); }

.btn-secondary { background: #e9ecef; }

.btn-danger {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.btn-danger:hover { background: var(--danger-hov); }

.btn-warning {
  background: var(--warning);
  color: #212529;
  border-color: var(--warning);
}

.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.8rem; }

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-top: 1rem;
}

.table th,
.table td {
  padding: 0.7rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.table th {
  background: #f8f9fa;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.table tr:last-child td { border-bottom: none; }

.table td.empty {
  text-align: center;
  color: var(--muted);
  padding: 2rem;
}

/* Filters */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin: 1rem 0;
}

.filters input,
.filters select {
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.9rem;
  min-width: 140px;
}

/* Stats */
.stats {
  margin: 1rem 0;
  font-size: 1.1rem;
}

/* Alerts */
.flash-messages { margin-bottom: 1rem; }

.alert {
  padding: 0.75rem 1rem;
  border-radius: 5px;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-danger  { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert-warning { background: #fff3cd; color: #856404; border: 1px solid #ffeeba; }
.alert-info    { background: #d1ecf1; color: #0c5460; border: 1px solid #bee5eb; }

/* Actions cell */
.actions form { display: inline; }

/* Footer */
.footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--muted);
}

/* Responsive */
@media (max-width: 768px) {
  .navbar { flex-direction: column; align-items: flex-start; }
  .nav-links { margin-top: 0.5rem; }
  .nav-links a { margin-left: 0; margin-right: 1rem; }
  .filters { flex-direction: column; align-items: stretch; }
  .table th, .table td { padding: 0.5rem; font-size: 0.85rem; }
}