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

:root {
  --primary: #d97706;
  --primary-light: #fbbf24;
  --success: #10b981;
  --warning: #f59e0b;
  --bg: #fffbeb;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #fde68a;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px;
}

/* Header */
header {
  padding: 30px 0;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

.header-content > div:first-child {
  text-align: left;
}

header h1 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 4px;
}

.subtitle {
  color: var(--text-light);
  font-size: 1rem;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-info span {
  color: var(--text-light);
  font-size: 0.9rem;
}

.btn-logout {
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-light);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.btn-logout:hover {
  background: var(--border);
  color: var(--text);
}

@media (max-width: 600px) {
  .header-content {
    flex-direction: column;
    text-align: center;
  }

  .header-content > div:first-child {
    text-align: center;
  }
}

/* Child Selector */
.child-selector {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 30px;
}

.child-selector label {
  font-size: 1rem;
  color: var(--text-light);
  font-weight: 500;
}

.child-selector select {
  padding: 12px 40px 12px 16px;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  font-size: 1rem;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  min-width: 180px;
}

.child-selector select:hover {
  border-color: var(--primary-light);
}

.child-selector select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

@media (max-width: 600px) {
  .child-selector {
    flex-direction: column;
    gap: 8px;
  }

  .child-selector select {
    width: 100%;
    max-width: 280px;
  }
}

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
  margin-bottom: 30px;
}

@media (max-width: 600px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.stat-card.count {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: white;
}

.stat-card.total {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  color: white;
}

.stat-card.paid {
  background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
  color: white;
}

.stat-card.pending {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
}

.stat-card.total .stat-value,
.stat-card.paid .stat-value,
.stat-card.pending .stat-value,
.stat-card.count .stat-value {
  color: white;
}

.stat-card.total .stat-label,
.stat-card.paid .stat-label,
.stat-card.pending .stat-label,
.stat-card.count .stat-label {
  color: rgba(255,255,255,0.9);
}

.stat-value {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 5px;
}

/* Table */
.table-container {
  background: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 15px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: linear-gradient(to top, #fef3c7 0%, #fde68a 100%);
  font-weight: 600;
  font-size: 0.85rem;
  color: #92400e;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

tr:hover td {
  background: var(--bg);
}

/* Status badges */
.status {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.status.paid {
  background: #d1fae5;
  color: #065f46;
}

.status.pending {
  background: #fef3c7;
  color: #92400e;
}

/* Amount */
.amount {
  font-weight: 600;
  color: var(--primary);
}

/* Empty state */
.empty-state {
  padding: 60px 20px;
  text-align: center;
  color: var(--text-light);
}

/* Footer */
footer {
  text-align: center;
  padding: 40px 0 20px;
  color: var(--text-light);
  font-size: 0.9rem;
}

/* Responsive table */
@media (max-width: 700px) {
  .table-container {
    overflow-x: auto;
  }

  table {
    min-width: 600px;
  }

  th, td {
    padding: 12px 8px;
    font-size: 0.9rem;
  }
}

/* Paid date tooltip */
.paid-date {
  display: block;
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 2px;
}

/* Login Screen */
.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.login-box {
  background: white;
  padding: 40px;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
  width: 90%;
  max-width: 360px;
}

.login-box h1 {
  margin-bottom: 10px;
  color: var(--primary);
}

.login-box p {
  color: var(--text-light);
  margin-bottom: 20px;
}

.login-box input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  margin-bottom: 15px;
  transition: border-color 0.2s;
}

.login-box input:focus {
  outline: none;
  border-color: var(--primary);
}

.login-box button {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}

.login-box button:hover {
  background: var(--primary-light);
}

.error-msg {
  color: #ef4444;
  font-size: 0.9rem;
  margin-top: 10px;
}

/* Toolbar */
.toolbar {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.btn-add, .btn-export {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-add {
  background: var(--primary);
  color: white;
}

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

.btn-export {
  background: var(--border);
  color: var(--text);
}

.btn-export:hover {
  background: #cbd5e1;
}

/* Action buttons in table */
.action-btn {
  padding: 4px 10px;
  border: none;
  border-radius: 4px;
  font-size: 0.8rem;
  cursor: pointer;
  margin-right: 5px;
}

.btn-edit {
  background: #dbeafe;
  color: #1d4ed8;
}

.btn-edit:hover {
  background: #bfdbfe;
}

.btn-delete {
  background: #fee2e2;
  color: #dc2626;
}

.btn-delete:hover {
  background: #fecaca;
}

.btn-pay {
  background: #d1fae5;
  color: #065f46;
}

.btn-pay:hover {
  background: #a7f3d0;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: white;
  padding: 30px;
  border-radius: 16px;
  width: 90%;
  max-width: 450px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-content h2 {
  margin-bottom: 20px;
  color: var(--text);
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 5px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
}

.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.btn-cancel, .btn-save {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
}

.btn-cancel {
  background: var(--border);
  color: var(--text);
}

.btn-save {
  background: var(--primary);
  color: white;
}

/* Export modal */
.export-content {
  max-width: 600px;
}

.export-hint {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 15px;
}

#exportData {
  width: 100%;
  height: 300px;
  padding: 12px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-family: monospace;
  font-size: 0.85rem;
  resize: none;
}