:root {
  --bg-gradient-start: #0f172a;
  --bg-gradient-end: #020617;
  --glass-bg: rgba(30, 41, 59, 0.45);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-highlight: rgba(255, 255, 255, 0.03);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.35);
  --accent-amber: #f59e0b;
  --accent-amber-glow: rgba(245, 158, 11, 0.25);
  
  --status-paid-bg: rgba(16, 185, 129, 0.15);
  --status-paid-border: rgba(16, 185, 129, 0.3);
  --status-paid-text: #34d399;
  
  --status-unpaid-bg: rgba(244, 63, 94, 0.12);
  --status-unpaid-border: rgba(244, 63, 94, 0.35);
  --status-unpaid-text: #fb7185;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  padding: 2.5rem 1rem;
}

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

header {
  margin-bottom: 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 1.5rem;
}

h1 {
  font-size: 2.25rem;
  font-weight: 800;
  background: linear-gradient(to right, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Glassmorphism Panel */
.panel {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  margin-bottom: 2rem;
}

/* Tabs & Forms styling */
.forms-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .forms-container {
    grid-template-columns: 1fr;
  }
}

.form-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #38bdf8;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  font-weight: 600;
}

input, select {
  width: 100%;
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--glass-border);
  background: rgba(15, 23, 42, 0.6);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 2px var(--accent-cyan-glow);
}

.btn {
  background: linear-gradient(135deg, #0891b2, #0284c7);
  border: none;
  color: white;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  width: 100%;
  transition: all 0.2s ease;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.15);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--accent-cyan-glow);
  filter: brightness(1.15);
}

.btn-logout {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: 1rem;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--status-unpaid-border);
  border-radius: 8px;
  color: var(--status-unpaid-text);
  background: var(--status-unpaid-bg);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-logout:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.login-card {
  max-width: 420px;
  width: 100%;
  text-align: center;
  padding: 2.5rem 2rem;
}

.login-card h1 {
  margin-bottom: 0.5rem;
}

.login-google {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: auto;
  margin-top: 1.75rem;
  text-decoration: none;
}

/* Pay period styling */
.period-card {
  border: 1px solid var(--glass-border);
  background: rgba(30, 41, 59, 0.25);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 2rem;
}

.period-header {
  padding: 1.25rem 1.5rem;
  background: rgba(15, 23, 42, 0.4);
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.period-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.period-dates {
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
}

.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th {
  padding: 1rem 1.5rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--glass-border);
  font-weight: 700;
}

td {
  padding: 1rem 1.5rem;
  font-size: 0.95rem;
  color: var(--text-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.amount {
  font-weight: 600;
}

/* Status pills */
.status-pill {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  border: 1px solid;
}

.status-paid {
  background-color: var(--status-paid-bg);
  border-color: var(--status-paid-border);
  color: var(--status-paid-text);
}

.status-unpaid {
  background-color: var(--status-unpaid-bg);
  border-color: var(--status-unpaid-border);
  color: var(--status-unpaid-text);
}

/* Action button */
.btn-pay {
  background: var(--status-unpaid-bg);
  border: 1px solid var(--status-unpaid-border);
  color: var(--status-unpaid-text);
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-pay:hover {
  background-color: var(--status-unpaid-text);
  color: #020617;
  box-shadow: 0 0 10px rgba(244, 63, 94, 0.35);
}

.main-nav {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link {
  padding: 0.35rem 0.85rem;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
  color: var(--text-primary);
  background: var(--accent-cyan-glow);
}

.btn-delete {
  background: var(--status-unpaid-bg);
  border: 1px solid var(--status-unpaid-border);
  color: var(--status-unpaid-text);
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-delete:hover {
  background-color: var(--status-unpaid-text);
  color: #020617;
  box-shadow: 0 0 10px rgba(244, 63, 94, 0.35);
}

.btn-edit {
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  margin-right: 0.4rem;
  transition: all 0.2s ease;
}

.btn-edit:hover {
  background-color: var(--text-secondary);
  color: #020617;
  box-shadow: 0 0 10px rgba(148, 163, 184, 0.35);
}

.text-completed {
  color: var(--status-paid-text);
  font-size: 1.1rem;
}

/* Summary Row styling */
.summary-row {
  background: rgba(15, 23, 42, 0.65);
}

.summary-row td {
  padding: 1.25rem 1.5rem;
  border-bottom: none;
  font-size: 1.05rem;
}

.summary-row td strong {
  color: var(--accent-amber);
  text-shadow: 0 0 12px var(--accent-amber-glow);
}

.summary-row td.amount strong {
  font-size: 1.15rem;
}

.overdue-badge {
  background-color: rgba(244, 63, 94, 0.15);
  border: 1px solid rgba(244, 63, 94, 0.4);
  color: #fb7185;
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
  margin-left: 0.5rem;
}