:root {
            --primary: #10B981;
            --secondary: #059669;
            --accent: #34D399;
            --warning: #F59E0B;
            --danger: #EF4444;
            --info: #3B82F6;
            --purple: #8B5CF6;
            --light: #F9FAFB;
            --dark: #111827;
            --gray: #6B7280;
            --light-gray: #F3F4F6;
            --bg-color: #ffffff;
            --card-bg: #ffffff;
            --text-color: #111827;
            --border-color: #E5E7EB;
        }

        .dark-mode {
            --primary: #34D399;
            --secondary: #059669;
            --accent: #10B981;
            --light: #1F2937;
            --dark: #F9FAFB;
            --gray: #9CA3AF;
            --light-gray: #374151;
            --bg-color: #111827;
            --card-bg: #1F2937;
            --text-color: #F9FAFB;
            --border-color: #374151;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Kalpurush', Tahoma, Geneva, Verdana, sans-serif;
            transition: background-color 0.3s, color 0.3s;
        }

        body {
            background: var(--bg-color);
            color: var(--text-color);
            min-height: 100vh;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }

        /* Header Styles */
        header {
            background: var(--card-bg);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            border-radius: 20px;
            padding: 15px 30px;
            margin-bottom: 25px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
            border: 1px solid var(--border-color);
        }

        .logo-section {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .logo {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 24px;
        }

        .header-text h1 {
            color: var(--primary);
            font-size: 18px;
            margin-bottom: 3px;
            line-height: 1.3;
        }

        .header-text p {
            color: var(--gray);
            font-size: 12px;
        }

        /* Top Navigation Bar */
        .top-nav {
            display: flex;
            gap: 8px;
            align-items: center;
            flex-wrap: wrap;
        }

        .nav-btn {
            padding: 10px 18px;
            border-radius: 10px;
            text-decoration: none;
            color: var(--text-color);
            font-weight: 600;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 8px;
            background: var(--light-gray);
            border: 1px solid var(--border-color);
            cursor: pointer;
            font-size: 13px;
            white-space: nowrap;
        }

        .nav-btn:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-2px);
            border-color: var(--primary);
        }

        .nav-btn.active {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            border-color: var(--primary);
        }

        /* Special Payment Button */
        .nav-btn.payment-btn {
            background: linear-gradient(135deg, #F59E0B, #D97706);
            color: white;
            border-color: #F59E0B;
        }

        .nav-btn.payment-btn:hover {
            background: linear-gradient(135deg, #D97706, #B45309);
        }

        /* Language Switcher */
        .language-switcher {
            display: flex;
            gap: 5px;
            background: var(--light-gray);
            border-radius: 10px;
            padding: 5px;
            border: 1px solid var(--border-color);
        }

        .lang-btn {
            padding: 8px 16px;
            border-radius: 8px;
            border: none;
            background: none;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            font-size: 14px;
            color: var(--text-color);
        }

        .lang-btn.active {
            background: var(--primary);
            color: white;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

        /* Theme Toggle */
        .theme-toggle {
            display: flex;
            align-items: center;
            gap: 10px;
            cursor: pointer;
            padding: 8px 12px;
            border-radius: 10px;
            background: var(--light-gray);
            border: 1px solid var(--border-color);
            color: var(--text-color);
        }

        .theme-toggle i {
            font-size: 18px;
        }

        .user-profile {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 15px;
            background: var(--light-gray);
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .user-avatar {
            width: 35px;
            height: 35px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        /* Content Sections */
        .content-section {
            display: none;
            animation: fadeIn 0.5s ease;
            min-height: 70vh;
        }

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

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Home Dashboard */
        .dashboard-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .stat-card {
            background: var(--card-bg);
            border-radius: 15px;
            padding: 25px;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s;
            border: 1px solid var(--border-color);
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
        }

        .stat-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .stat-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            background: var(--light-gray);
        }

        .icon-fund-total { color: var(--primary); }
        .icon-fund-balance { color: var(--info); }
        .icon-fee-collect { color: var(--accent); }
        .icon-gift { color: var(--purple); }
        .icon-total-expense { color: var(--danger); }
        .icon-monthly-expense { color: var(--warning); }

        .stat-info h3 {
            font-size: 14px;
            color: var(--gray);
            margin-bottom: 8px;
        }

        .stat-value {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-color);
        }

        .stat-change {
            font-size: 12px;
            color: var(--gray);
            margin-top: 5px;
        }

        /* Donation SMS Section */
        .donation-section {
            background: var(--card-bg);
            border-radius: 20px;
            padding: 30px;
            margin-top: 30px;
            border: 1px solid var(--border-color);
        }

        .donation-box {
            background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
            border-radius: 15px;
            padding: 25px;
            border: 2px dashed var(--primary);
            margin-bottom: 25px;
        }

        .payment-link-box {
            background: var(--light-gray);
            border-radius: 12px;
            padding: 15px;
            margin: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 15px;
        }

        .payment-link {
            font-family: monospace;
            background: var(--card-bg);
            padding: 12px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            flex: 1;
            min-width: 300px;
        }

        .btn {
            padding: 10px 20px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            font-weight: 600;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.3s;
            font-size: 14px;
            background: var(--light-gray);
            color: var(--text-color);
        }

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

        .btn-primary:hover {
            opacity: 0.9;
            transform: translateY(-2px);
        }

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

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

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

        /* SMS Modal */
        .sms-modal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            display: none;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .sms-modal.active {
            display: flex;
        }

        .sms-content {
            background: var(--card-bg);
            border-radius: 20px;
            padding: 30px;
            width: 100%;
            max-width: 500px;
            border: 1px solid var(--border-color);
        }

        .sms-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
        }

        .sms-template {
            background: var(--light-gray);
            padding: 15px;
            border-radius: 10px;
            margin: 15px 0;
            border-left: 4px solid var(--info);
        }

        /* Report Page */
        .report-container {
            background: var(--card-bg);
            border-radius: 20px;
            padding: 30px;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.05);
            border: 1px solid var(--border-color);
        }

        .section-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            flex-wrap: wrap;
            gap: 15px;
        }

        .section-header h2 {
            color: var(--text-color);
            font-size: 24px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .report-heading {
            text-align: center;
            margin: 30px 0;
            padding: 20px;
            background: var(--light-gray);
            border-radius: 15px;
            border: 2px solid var(--primary);
        }

        .report-heading h1 {
            color: var(--primary);
            margin-bottom: 10px;
            font-size: 28px;
        }

        .report-heading p {
            color: var(--gray);
            font-size: 14px;
        }

        .report-filters {
            display: flex;
            gap: 15px;
            margin-bottom: 25px;
            flex-wrap: wrap;
        }

        .filter-input {
            padding: 10px 15px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            background: var(--light-gray);
            color: var(--text-color);
            min-width: 200px;
        }

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

        /* Table Styles */
        .table-container {
            overflow-x: auto;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            margin-top: 20px;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            background: var(--card-bg);
        }

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

        th {
            padding: 15px;
            text-align: left;
            font-weight: 600;
            color: var(--text-color);
            border-bottom: 2px solid var(--border-color);
            font-size: 14px;
            white-space: nowrap;
        }

        td {
            padding: 15px;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
            color: var(--text-color);
        }

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

        .status-badge {
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
        }

        .status-paid { background: #D1FAE5; color: #065F46; }
        .status-pending { background: #FEF3C7; color: #92400E; }
        .status-overdue { background: #FEE2E2; color: #991B1B; }

        /* Payment Form */
        .payment-form {
            background: var(--card-bg);
            border-radius: 20px;
            padding: 30px;
            max-width: 500px;
            margin: 0 auto;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--text-color);
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            background: var(--light-gray);
            font-size: 14px;
            color: var(--text-color);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
        }

        /* Payment Method Details */
        .payment-details-box {
            background: var(--light-gray);
            padding: 15px;
            border-radius: 10px;
            margin-top: 5px;
            border-left: 4px solid var(--primary);
            font-size: 14px;
            line-height: 1.5;
        }

        .payment-method-card {
            transition: transform 0.3s, box-shadow 0.3s;
            background: var(--card-bg);
            padding: 15px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
        }

        .payment-method-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        #important-note {
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { opacity: 0.8; }
            50% { opacity: 1; }
            100% { opacity: 0.8; }
        }

        /* Auto-fill Button */
        .auto-fill-btn {
            margin-top: 5px;
            padding: 6px 12px;
            font-size: 12px;
            background: var(--info);
            color: white;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .auto-fill-btn:hover {
            background: #2563EB;
        }

        /* Payment Receipt Button */
        .receipt-btn {
            margin-top: 15px;
            padding: 12px 20px;
            background: linear-gradient(135deg, var(--purple), #7C3AED);
            color: white;
            border: none;
            border-radius: 10px;
            font-weight: 600;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.3s;
        }

        .receipt-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
        }

        /* SMS Send Button */
        .sms-send-btn {
            margin-top: 10px;
            padding: 10px 15px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 5px;
            transition: all 0.3s;
        }

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

        /* Footer */
        footer {
            text-align: center;
            padding: 20px;
            color: var(--gray);
            font-size: 14px;
            margin-top: 40px;
            border-top: 1px solid var(--border-color);
        }

        /* Responsive */
        @media (max-width: 768px) {
            header {
                flex-direction: column;
                text-align: center;
            }
            
            .top-nav {
                justify-content: center;
            }
            
            .nav-btn {
                padding: 8px 12px;
                font-size: 12px;
            }
            
            .nav-btn span {
                display: none;
            }
            
            .nav-btn i {
                margin: 0;
            }
            
            .section-header {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .btn {
                width: 100%;
                justify-content: center;
            }
            
            .dashboard-grid {
                grid-template-columns: 1fr;
            }
            
            .payment-link-box {
                flex-direction: column;
                align-items: stretch;
            }
            
            .payment-link {
                min-width: auto;
            }
        }

        @media (max-width: 480px) {
            .theme-toggle, .language-switcher {
                width: 100%;
                justify-content: center;
            }
        }