:root {
  --navy: #0A2540;
  --navy-dark: #071b30;
  --cyan: #00B4D8;
  --bg: #F5F7FA;
  --card-bg: #FFFFFF;
  --text: #1B2430;
  --muted: #6B7688;
  --border: #E3E8EF;
  --danger: #D64545;
  --success: #2E9E5B;
  --warning: #D98C24;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--cyan); }

/* --- Layout shell: fixed left sidebar + scrollable main content --- */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--navy);
  color: #fff;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.sidebar-brand img { height: 56px; flex-shrink: 0; }
.sidebar-brand-title { font-weight: 700; font-size: 15px; line-height: 1.2; }
.sidebar-brand-subtitle { font-size: 11px; color: #9fb3c8; }

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px;
  flex: 1;
}

.sidebar-nav a {
  color: #cfe8f5;
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 14px;
  transition: background-color 0.12s ease;
}
.sidebar-nav a:hover { background: rgba(255, 255, 255, 0.08); color: #fff; }
.sidebar-nav a.active { background: var(--cyan); color: var(--navy); font-weight: 600; }

.sidebar-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
  margin: 8px 4px;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 13px;
  color: #cfe8f5;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.link-btn {
  background: none;
  border: none;
  color: #cfe8f5;
  cursor: pointer;
  text-decoration: underline;
  font-size: 13px;
  padding: 0;
  text-align: left;
}

.main-content {
  flex: 1;
  min-width: 0; /* lets wide tables scroll instead of blowing out the layout */
  padding: 24px;
}

/* Below ~820px (tablet/phone), collapse the sidebar into a horizontal top
   bar instead — a fixed 240px column stops making sense on a narrow screen. */
@media (max-width: 820px) {
  .app-shell { flex-direction: column; }
  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
  }
  .sidebar-brand { border-bottom: none; padding: 10px 16px; }
  .sidebar-nav { flex-direction: row; flex-wrap: wrap; padding: 4px 12px; }
  .sidebar-divider { display: none; }
  .sidebar-footer {
    border-top: none;
    flex-direction: row;
    align-items: center;
    margin-left: auto;
    padding: 10px 16px;
  }
}

/* Phone portrait widths: the "dock session info to the right" trick above
   gets cramped once there's no room left of it, so stack everything full
   width instead, and tighten up spacing generally. */
@media (max-width: 480px) {
  .sidebar-footer {
    margin-left: 0;
    width: 100%;
    justify-content: space-between;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
  }
  .main-content { padding: 16px; }
  h1 { font-size: 19px; }
  .card-grid { grid-template-columns: 1fr; }
  .form-card { padding: 16px; }
  .stat-card .value { font-size: 22px; }
}

.container { padding: 24px; max-width: 1200px; margin: 0 auto; }

h1 { font-size: 22px; color: var(--navy); margin-bottom: 16px; }
h2 { font-size: 18px; color: var(--navy); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  border-top: 4px solid var(--cyan);
}

.stat-card.missed { border-top-color: var(--danger); }
.stat-card.paid { border-top-color: var(--success); }
.stat-card.month { border-top-color: var(--warning); }

.stat-card .label { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.03em; }
.stat-card .value { font-size: 26px; font-weight: 700; color: var(--navy); margin-top: 6px; }
.stat-card .subvalue { font-size: 13px; color: var(--muted); margin-top: 2px; }

/* Wraps every <table> so wide tables (Reports has 9 columns) scroll
   horizontally within themselves on narrow screens instead of breaking the
   whole page layout or forcing tiny unreadable text. */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: 8px;
}

table {
  width: 100%;
  min-width: 560px; /* keeps columns legible; scrolls below this instead of squishing */
  border-collapse: collapse;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  white-space: nowrap;
}

th { background: #F0F3F7; color: var(--navy); font-weight: 600; }

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

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge.pending { background: #FFF3D6; color: var(--warning); }
.badge.missed { background: #FBE1E1; color: var(--danger); }
.badge.paid { background: #E1F5E9; color: var(--success); }

/* Payment status color scheme: Paid green / Upcoming yellow / Overdue red / Scheduled blue */
.badge.status-paid { background: #10B98122; color: #10B981; }
.badge.status-upcoming { background: #F59E0B22; color: #F59E0B; }
.badge.status-overdue { background: #EF444422; color: #EF4444; }
.badge.status-scheduled { background: #2563EB22; color: #2563EB; }

.email-check { color: #10B981; font-weight: 600; }
.email-pending { color: #6B7688; }

.btn {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  border: none;
  padding: 9px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  text-decoration: none;
}

.btn:hover { background: var(--navy-dark); color: #fff; }
.btn.secondary { background: #fff; color: var(--navy); border: 1px solid var(--border); }
.btn.danger { background: var(--danger); }

.actions { margin-bottom: 16px; display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

form.stacked label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin: 12px 0 4px;
}

form.stacked input,
form.stacked select,
form.stacked textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}

.form-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  max-width: 560px;
}

.error-box {
  background: #FBE1E1;
  color: var(--danger);
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 16px;
  font-size: 14px;
}

.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--navy);
  padding: 20px;
}

.login-card {
  background: #fff;
  padding: 36px;
  border-radius: 10px;
  width: 320px;
  max-width: 100%;
  box-sizing: border-box;
}

.login-card h1 { text-align: center; }

.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.tabs a {
  padding: 8px 16px;
  border-radius: 6px 6px 0 0;
  background: #fff;
  border: 1px solid var(--border);
  border-bottom: none;
  color: var(--muted);
}
.tabs a.active { color: var(--navy); font-weight: 600; background: var(--card-bg); }

.filter-bar { margin-bottom: 16px; display: flex; flex-wrap: wrap; gap: 8px; }
.filter-bar a {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
}
.filter-bar a.active { background: var(--navy); color: #fff; border-color: var(--navy); }