/* Modern Admin Dashboard Styles */

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

:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --dark: #1f2937;
    --light: #f3f4f6;
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark);
}

/* Screens */
.screen {
    display: none;
}

.screen.active {
    display: block;
}

/* Login Screen */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-card {
    background: white;
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    text-align: center;
    margin-bottom: 2rem;
}

.logo h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.logo p {
    color: #6b7280;
    font-size: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--light);
    color: var(--dark);
    width: 100%;
}

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

.btn-icon {
    padding: 0.5rem;
    background: white;
    border: 2px solid var(--border);
    font-size: 1.2rem;
}

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

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--light);
    cursor: pointer;
    margin-left: 0.5rem;
}

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

.loader {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

.error-message {
    margin-top: 1rem;
    padding: 0.75rem;
    background: #fee2e2;
    border: 1px solid var(--danger);
    border-radius: 8px;
    color: var(--danger);
    font-size: 0.9rem;
}

/* Dashboard Layout */
#dashboardScreen {
    display: none;
    min-height: 100vh;
}

#dashboardScreen.active {
    display: flex;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: white;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.sidebar-header p {
    color: #6b7280;
    font-size: 0.9rem;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.5rem;
    color: #6b7280;
    text-decoration: none;
    transition: all 0.3s;
}

.nav-item:hover {
    background: var(--light);
    color: var(--dark);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-right: 4px solid var(--primary-dark);
}

.nav-item .icon {
    font-size: 1.25rem;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

/* Main Content */
.main-content {
    margin-left: 260px;
    min-height: 100vh;
    background: var(--light);
    padding: 2rem;
}

.header {
    background: white;
    padding: 1.5rem 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.75rem;
}

/* Views */
.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    display: flex;
    gap: 1rem;
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.stat-content {
    flex: 1;
}

.stat-label {
    color: #6b7280;
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
}

/* Chart Section */
.chart-section {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.chart-section h2 {
    margin-bottom: 1.5rem;
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.activity-item {
    padding: 1rem;
    background: var(--light);
    border-radius: 10px;
    border-left: 4px solid var(--primary);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tab {
    padding: 0.75rem 1.5rem;
    background: white;
    border: 2px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.tab:hover {
    background: var(--light);
}

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

/* Table */
.table-container {
    background: white;
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

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

thead {
    background: var(--light);
}

th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--dark);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

tr:hover {
    background: var(--light);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success {
    background: #d1fae5;
    color: var(--success);
}

.badge-warning {
    background: #fef3c7;
    color: var(--warning);
}

.badge-danger {
    background: #fee2e2;
    color: var(--danger);
}

.badge-info {
    background: #dbeafe;
    color: var(--info);
}

/* Recharge Form */
.recharge-form-container {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.result-message {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 10px;
    font-weight: 500;
}

.result-message.success {
    background: #d1fae5;
    color: var(--success);
}

.result-message.error {
    background: #fee2e2;
    color: var(--danger);
}

/* Recent Recharges */
.recent-recharges {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.recent-recharges h3 {
    margin-bottom: 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 0;
        transform: translateX(-100%);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}