:root {
  --primary: #4CAF50;
  --primary-dark: #388E3C;
  --secondary: #2196F3;
  --danger: #F44336;
  --warning: #FF9800;
  --text: #333;
  --text-light: #666;
  --bg: #f5f7fa;
  --card-bg: #ffffff;
  --border: #e0e0e0;
  --shadow: 0 2px 10px rgba(0,0,0,0.1);
  --radius: 12px;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: inherit;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #f0f0f0; color: var(--text); }
.btn-secondary:hover { background: #e0e0e0; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: #f0f0f0; }
.btn-remove { background: transparent; color: var(--danger); border: none; font-size: 18px; cursor: pointer; padding: 5px; }
.btn-icon { background: none; border: none; cursor: pointer; font-size: 18px; padding: 5px; }
.btn-sm { padding: 6px 12px; font-size: 14px; }

/* Login Page */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}
.auth-card {
  background: var(--card-bg);
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  max-width: 400px;
  width: 100%;
}
.auth-card h1 { margin-bottom: 10px; font-size: 28px; }
.auth-card p { color: var(--text-light); margin-bottom: 30px; }
.btn-google { background: #fff; border: 1px solid var(--border); color: var(--text); width: 100%; justify-content: center; font-weight: 500; }
.btn-google:hover { background: #f8f9fa; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
.auth-note { font-size: 12px; margin-top: 20px; color: #999; }

/* Setup Page */
.setup-container { max-width: 800px; margin: 40px auto; padding: 20px; }
.setup-header { text-align: center; margin-bottom: 30px; }
.progress-bar { display: flex; justify-content: center; margin: 20px 0; }
.progress-step { padding: 8px 16px; background: #e0e0e0; color: #666; border-radius: 20px; margin: 0 5px; font-size: 14px; }
.progress-step.active { background: var(--primary); color: white; }
.progress-step.completed { background: #a5d6a7; color: #1b5e20; }
.setup-body { background: var(--card-bg); padding: 30px; border-radius: var(--radius); box-shadow: var(--shadow); }
.step-content h2 { margin-bottom: 10px; }
.step-content p { color: var(--text-light); margin-bottom: 20px; }
.income-row, .expense-category-row, .child-row { display: flex; gap: 10px; margin-bottom: 15px; align-items: center; flex-wrap: wrap; }
.income-row input, .expense-category-row input, .child-row input { padding: 10px; border: 1px solid var(--border); border-radius: 6px; flex: 1; min-width: 150px; }
.expense-category-row .checkbox-label { flex: 1; min-width: 150px; }
.expense-category-row .expense-amount { flex: 1; }
.step-actions { margin-top: 30px; display: flex; justify-content: space-between; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; }
.form-group input[type="text"], .form-group input[type="number"] { width: 100%; padding: 10px; border: 1px solid var(--border); border-radius: 6px; }
.error input { border-color: var(--danger) !important; }

/* Dashboard */
.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  flex-wrap: wrap;
  gap: 10px;
}
.logo { font-size: 20px; font-weight: bold; }
.month-nav { display: flex; align-items: center; gap: 10px; }
.month-label { font-size: 18px; font-weight: 500; min-width: 150px; text-align: center; }
.month-picker { padding: 5px; border: 1px solid var(--border); border-radius: 6px; }
.header-actions { display: flex; gap: 10px; align-items: center; }
.dashboard-main { max-width: 1200px; margin: 20px auto; padding: 0 20px; }
.summary-cards { display: flex; gap: 20px; margin-bottom: 30px; flex-wrap: wrap; }
.card { background: var(--card-bg); padding: 20px; border-radius: var(--radius); box-shadow: var(--shadow); flex: 1; min-width: 200px; text-align: center; }
.card h3 { font-size: 16px; color: var(--text-light); margin-bottom: 10px; }
.card p { font-size: 24px; font-weight: bold; }
.income-card p { color: var(--primary); }
.expenses-card p { color: var(--danger); }
.savings-card p { color: var(--secondary); }
.charts-container { display: flex; gap: 20px; margin-bottom: 30px; flex-wrap: wrap; }
.chart-card { background: var(--card-bg); padding: 20px; border-radius: var(--radius); box-shadow: var(--shadow); flex: 1; min-width: 300px; height: 300px; position: relative; }
.chart-card canvas { width: 100% !important; height: 100% !important; }
.data-sections { display: flex; gap: 20px; flex-wrap: wrap; }
.data-section { background: var(--card-bg); padding: 20px; border-radius: var(--radius); box-shadow: var(--shadow); flex: 1; min-width: 250px; }
.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.section-header h2 { font-size: 18px; }
.data-list { list-style: none; }
.data-item { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px solid #f0f0f0; }
.data-item .item-name { flex: 2; }
.data-item .item-amount { flex: 1; text-align: right; font-weight: 500; }
.data-item .item-actions { flex: 1; text-align: right; }
.empty-state { text-align: center; padding: 40px; background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); margin-top: 20px; color: var(--text-light); }

/* Modals */
.modal { display: none; position: fixed; z-index: 200; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.5); overflow: auto; }
.modal-content { background: var(--card-bg); margin: 10% auto; padding: 20px; border-radius: var(--radius); max-width: 500px; width: 90%; position: relative; }
.close { position: absolute; top: 10px; right: 20px; font-size: 28px; cursor: pointer; color: #aaa; }
.close:hover { color: #000; }

/* Electricity Page specific */
.electricity-settings { display: flex; gap: 20px; margin-bottom: 30px; flex-wrap: wrap; }
.electricity-settings .card { min-width: 250px; flex: 1; text-align: left; }
.electricity-settings .card h3 { margin-bottom: 15px; color: var(--text); }
.electricity-settings .form-group { margin-bottom: 10px; }
.electricity-settings input[type="number"], .electricity-settings input[type="text"] { width: 100%; padding: 8px; border: 1px solid var(--border); border-radius: 6px; }
.electricity-settings button[type="submit"] { width: 100%; margin-top: 10px; }

/* Responsive */
@media (max-width: 768px) {
  .summary-cards, .charts-container, .data-sections, .electricity-settings { flex-direction: column; }
  .dashboard-header { flex-direction: column; gap: 10px; align-items: stretch; text-align: center; }
  .month-nav, .header-actions { justify-content: center; }
}