/* ========================================
   SECURE PAYMENT TERMINAL - CUSTOM CSS
   With Dark Mode Support
   ======================================== */

:root {
    /* Light Mode Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #eff6ff;
    --success: #22c55e;
    --success-light: #dcfce7;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    --purple: #8b5cf6;
    --purple-light: #ede9fe;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
}

[data-theme="dark"] {
    /* Dark Mode Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --primary: #60a5fa;
    --primary-dark: #3b82f6;
    --primary-light: #1e293b;
    --success: #4ade80;
    --success-light: #14532d;
    --warning: #fbbf24;
    --warning-light: #451e03;
    --danger: #f87171;
    --danger-light: #3f0e0e;
    --purple: #a78bfa;
    --purple-light: #2e1a5e;
    --gray-100: #1e293b;
    --gray-200: #334155;
    --gray-300: #475569;
    --gray-400: #64748b;
    --gray-500: #94a3b8;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.3s ease;
    line-height: 1.5;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon span {
    font-size: 20px;
    font-weight: bold;
    color: white;
}

.logo-text h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.logo-text p {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Brand Selector */
.brand-selector {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-selector label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.brand-buttons {
    display: flex;
    gap: 8px;
}

.brand-btn {
    padding: 6px 16px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: all 0.2s;
}

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

.brand-btn:hover:not(.active) {
    background: var(--bg-primary);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background: var(--border-color);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: white;
}

.user-info {
    display: none;
}

@media (min-width: 768px) {
    .user-info {
        display: block;
    }
    .user-info span {
        font-size: 0.875rem;
        font-weight: 500;
    }
    .user-info p {
        font-size: 0.75rem;
        color: var(--text-muted);
    }
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 8px;
    padding: 0 24px 0 24px;
    max-width: 1400px;
    margin: 0 auto;
    overflow-x: auto;
    border-bottom: 1px solid var(--border-color);
}

.nav-tab {
    padding: 12px 20px;
    font-size: 0.875rem;
    font-weight: 500;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.nav-tab:hover {
    color: var(--primary);
}

.nav-tab.active {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
}

/* ========================================
   STATS CARDS
   ======================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 24px 0;
}

@media (min-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-card .stat-title {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.stat-card .stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card .stat-icon {
    float: right;
    font-size: 2rem;
    opacity: 0.5;
}

/* ========================================
   SEARCH BAR
   ======================================== */
.search-bar {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 24px;
}

.search-fields {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

@media (min-width: 768px) {
    .search-fields {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}

.search-input {
    flex: 1;
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 16px;
}

.search-input input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.search-input input::placeholder {
    color: var(--text-muted);
}

.filters {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.filter-select {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 16px;
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary);
    border: none;
    border-radius: 10px;
    padding: 10px 20px;
    color: white;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

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

/* ========================================
   TABLE
   ======================================== */
.table-container {
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

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

th {
    text-align: left;
    padding: 16px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
}

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

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-pending {
    background: var(--warning-light);
    color: var(--warning);
}

.badge-paid {
    background: var(--success-light);
    color: var(--success);
}

.badge-failed {
    background: var(--danger-light);
    color: var(--danger);
}

.btn-link {
    background: transparent;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 0.875rem;
    margin-right: 12px;
    transition: opacity 0.2s;
}

.btn-link:hover {
    opacity: 0.8;
}

.btn-success {
    background: var(--success);
    border: none;
    border-radius: 8px;
    padding: 6px 12px;
    color: white;
    font-size: 0.75rem;
    cursor: pointer;
}

/* ========================================
   MODAL
   ======================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 20px;
    width: 90%;
    max-width: 550px;
    max-height: 90vh;
    overflow-y: auto;
    border: 1px solid var(--border-color);
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.25rem;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.875rem;
}

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

.customer-info-box {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 20px;
}

.customer-info-box p {
    margin: 8px 0;
    font-size: 0.875rem;
}

/* Payment Gateways Preview */
.gateway-preview {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 16px;
    margin-top: 20px;
    text-align: center;
    border: 1px solid var(--border-color);
}

/* ========================================
   SETTINGS PAGE STYLES
   ======================================== */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin: 24px 0;
}

@media (min-width: 768px) {
    .settings-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.settings-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.settings-card-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.settings-card-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.settings-card-body {
    padding: 20px;
}

.gateway-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.gateway-item:last-child {
    border-bottom: none;
}

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

.gateway-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.gateway-status.active {
    background: var(--success);
}

.gateway-status.inactive {
    background: var(--danger);
}

.toggle-switch {
    width: 44px;
    height: 24px;
    background: var(--gray-400);
    border-radius: 24px;
    position: relative;
    cursor: pointer;
    transition: background 0.2s;
}

.toggle-switch.active {
    background: var(--primary);
}

.toggle-switch::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform 0.2s;
}

.toggle-switch.active::after {
    transform: translateX(20px);
}

/* ========================================
   PAYMENT PAGE STYLES
   ======================================== */
.payment-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.payment-card {
    background: var(--bg-secondary);
    border-radius: 24px;
    max-width: 500px;
    width: 100%;
    padding: 32px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}

.brand-logo {
    text-align: center;
    margin-bottom: 24px;
}

.brand-logo h2 {
    font-size: 1.5rem;
    margin-top: 12px;
}

.payment-amount {
    text-align: center;
    margin-bottom: 32px;
}

.payment-amount .amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
}

.gateway-form {
    margin-top: 24px;
}

/* ========================================
   UTILITIES
   ======================================== */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.mt-4 {
    margin-top: 16px;
}

.text-center {
    text-align: center;
}

/* Mobile Responsive */
@media (max-width: 640px) {
    .container {
        padding: 0 16px;
    }
    
    .header-content {
        flex-direction: column;
        gap: 12px;
    }
    
    .brand-selector {
        width: 100%;
        justify-content: center;
    }
    
    td {
        padding: 12px;
    }
    
    .btn-link {
        display: inline-block;
        margin-bottom: 8px;
    }
    
    .payment-card {
        padding: 20px;
    }
}