:root {
  --primary: #1e3a8a;
  --primary-hover: #172554;
  --secondary: #f97316; /* Bank of Baroda signature warm vermilion */
  --secondary-hover: #ea580c;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --dark: #0f172a;
  --light: #f8fafc;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  font-family: var(--font-family);
  background: #f1f5f9;
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px;
}

/* Header & Nav */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  margin-bottom: 24px;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  height: 48px;
  width: auto;
  max-width: 54px;
  object-fit: contain;
  display: block;
}

.brand-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 20px;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.header-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 9999px;
  background: #e0f2fe;
  color: #0369a1;
}

.badge-bob {
  background: #ffedd5;
  color: #c2410c;
}

.badge-gst {
  background: #ecfdf5;
  color: #047857;
}

/* Hero & Tabs */
.hero-card {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
  color: white;
  border-radius: 20px;
  padding: 32px 28px;
  margin-bottom: 28px;
  box-shadow: 0 10px 25px -5px rgba(30, 58, 138, 0.3);
}

.hero-title {
  font-size: 1.85rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.hero-desc {
  font-size: 0.95rem;
  color: #cbd5e1;
  max-width: 650px;
}

.mode-selector {
  display: flex;
  background: #f8fafc;
  padding: 6px;
  border-radius: 14px;
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.mode-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 20px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: transparent;
  transition: all 0.2s ease;
}

.mode-tab.active {
  background: #ffffff;
  color: var(--primary);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
}

.mode-tab .tab-icon {
  font-size: 1.25rem;
}

/* Grid Layout */
.checkout-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 868px) {
  .checkout-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 24px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.04);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Form inputs */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.95rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
  color: var(--text-main);
  outline: none;
  transition: border-color 0.15s ease;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.input-group {
  display: flex;
  gap: 8px;
}

/* Payment Method Cards */
.payment-methods {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.method-choice {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  background: #ffffff;
  transition: all 0.2s ease;
}

.method-choice:hover {
  border-color: #cbd5e1;
  background: #f8fafc;
}

.method-choice.selected {
  border-color: var(--primary);
  background: #eff6ff;
}

.method-radio {
  accent-color: var(--primary);
  width: 18px;
  height: 18px;
}

.method-info {
  flex: 1;
}

.method-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--dark);
}

.method-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Dynamic Details Area */
.payment-details-box {
  margin-top: 20px;
  padding: 20px;
  background: #f8fafc;
  border-radius: 14px;
  border: 1px solid var(--border);
}

/* UPI QR Section */
.upi-qr-wrapper {
  text-align: center;
  padding: 10px;
}

.upi-qr-img {
  width: 200px;
  height: 200px;
  border-radius: 12px;
  border: 4px solid #ffffff;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  margin: 12px auto;
  display: block;
}

.upi-app-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 16px;
}

.btn-app {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--dark);
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn-app:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

/* Copy Field */
.copy-field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #ffffff;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 8px;
}

.copy-field-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.copy-field-val {
  font-family: monospace;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--dark);
}

.btn-copy {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
}

.btn-copy:hover {
  background: #e0f2fe;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 20px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

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

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

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

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

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text-main);
}

.btn-outline:hover {
  background: #f8fafc;
}

/* Tax Table */
.tax-breakdown-card {
  background: #f8fafc;
  border-radius: 12px;
  padding: 16px;
  margin-top: 16px;
  border: 1px solid var(--border);
}

.tax-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  padding: 4px 0;
  color: var(--text-muted);
}

.tax-row.total {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--dark);
  border-top: 1.5px solid var(--border);
  margin-top: 8px;
  padding-top: 8px;
}

/* Footer */
.footer {
  text-align: center;
  padding: 24px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 40px;
}

/* Alerts */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.88rem;
  margin-bottom: 16px;
}

.alert-success {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-info {
  background: #eff6ff;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}