body {
            margin: 0;
            padding: 0;
            font-family: Arial, sans-serif;
            background-image: url(background.png);
            background-attachment: fixed;
            min-height: 100vh;
        }

        #container {
            position: relative;
            width: 100%;
            max-width: 500px;
            margin: 50px auto;
        }

        /* Calculator */
        #calculator {
            background: #fff;
            padding: 2rem;
            border-radius: 16px;
            box-shadow: 0 6px 16px rgba(0,0,0,0.1);
            margin-bottom: 2rem;
        }

        /* Inputs and buttons */
        input, button {
            width: 100%;
            margin-top: 0.5rem;
            padding: 0.6rem;
            border-radius: 10px;
            border: 1px solid #cbd5e1;
            font-size: 1rem;
        }

        button {
            background: #3b82f6;
            color: #fff;
            border: none;
            cursor: pointer;
            transition: 0.2s;
        }

        button:hover {
            background: #2563eb;
        }

        .secondary-btn {
            background: #6b7280;
            margin-top: 1rem;
        }

        .secondary-btn:hover {
            background: #4b5563;
        }

        .save-btn {
            background: #10b981;
            margin-top: 1rem;
        }

        .save-btn:hover {
            background: #059669;
        }

        /* Overlay */
        #overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(31,41,55,0.85);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.5s ease;
        }

        #overlay.active {
            opacity: 1;
            pointer-events: all;
        }

        .overlay-card {
            background: #fff;
            padding: 2rem;
            border-radius: 16px;
            width: 90%;
            max-width: 400px;
            text-align: center;
            transform: scale(0.95);
            transition: transform 0.5s ease;
        }

        #overlay.active .overlay-card {
            transform: scale(1);
        }

        .error {
            color: red;
            margin-top: 0.5rem;
        }

        /* Enhanced Results Styles */
        .results-container {
            margin-top: 2rem;
            animation: fadeInUp 0.6s ease-out;
        }

        .results-header {
            text-align: center;
            margin-bottom: 1.5rem;
            padding: 1rem;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 16px;
            color: white;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
        }

        .results-header h3 {
            margin: 0 0 0.5rem 0;
            font-size: 1.4rem;
            font-weight: 700;
        }

        .total-summary {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 0.5rem;
        }

        .total-label {
            font-size: 1rem;
            opacity: 0.9;
        }

        .total-amount {
            font-size: 1.3rem;
            font-weight: 700;
            background: rgba(255, 255, 255, 0.2);
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
        }

        .distribution-cards {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            margin-bottom: 1rem;
        }

        .role-card, .excess-card {
            background: white;
            border-radius: 16px;
            padding: 1.2rem;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            border: 2px solid transparent;
            transition: all 0.3s ease;
            opacity: 0;
            transform: translateY(20px);
        }

        .role-card:hover, .excess-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
        }

        .server-card {
            border-color: #10b981;
            background: linear-gradient(135deg, #ecfdf5 0%, #f0fdf4 100%);
        }

        .server-card:hover {
            border-color: #059669;
        }

        .busser-card {
            border-color: #f59e0b;
            background: linear-gradient(135deg, #fffbeb 0%, #fefce8 100%);
        }

        .busser-card:hover {
            border-color: #d97706;
        }

        .host-card {
            border-color: #8b5cf6;
            background: linear-gradient(135deg, #faf5ff 0%, #f3e8ff 100%);
        }

        .host-card:hover {
            border-color: #7c3aed;
        }

        .role-header {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            margin-bottom: 1rem;
        }

        .role-icon {
            font-size: 1.5rem;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.8);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

        .role-info h4 {
            margin: 0;
            font-size: 1.1rem;
            color: #1f2937;
            font-weight: 600;
        }

        .role-count {
            font-size: 0.9rem;
            color: #6b7280;
            font-weight: 500;
        }

        .pay-info {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .per-person, .total-role {
            text-align: center;
            padding: 0.8rem;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.7);
            min-width: 100px;
        }

        .per-person .amount, .total-role .total-amount {
            display: block;
            font-size: 1.3rem;
            font-weight: 700;
            color: #1f2937;
            margin-bottom: 0.2rem;
        }

        .per-person .label, .total-role .label {
            font-size: 0.8rem;
            color: #6b7280;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            font-weight: 500;
        }

        .excess-card {
            background: linear-gradient(135deg, #fef3c7 0%, #fef7cd 100%);
            border-color: #f59e0b;
        }

        .excess-card:hover {
            border-color: #d97706;
        }

        .excess-header {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            margin-bottom: 1rem;
        }

        .excess-icon {
            font-size: 1.5rem;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.8);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

        .excess-info h4 {
            margin: 0;
            font-size: 1.1rem;
            color: #1f2937;
            font-weight: 600;
        }

        .excess-note {
            font-size: 0.9rem;
            color: #6b7280;
            font-weight: 500;
        }

        .excess-amount {
            text-align: center;
            font-size: 1.8rem;
            font-weight: 700;
            color: #d97706;
            background: rgba(255, 255, 255, 0.8);
            padding: 1rem;
            border-radius: 12px;
        }

        .summary-footer {
            text-align: center;
            padding: 1rem;
            background: #f8fafc;
            border-radius: 12px;
            border: 2px solid #e2e8f0;
        }

        .summary-footer .label {
            font-size: 1rem;
            color: #6b7280;
            margin-right: 0.5rem;
        }

        .summary-footer .amount {
            font-size: 1.2rem;
            font-weight: 700;
            color: #1f2937;
        }

        .error-card {
            text-align: center;
            padding: 2rem;
            background: linear-gradient(135deg, #fee2e2 0%, #fef2f2 100%);
            border: 2px solid #fca5a5;
            border-radius: 16px;
            margin-top: 1rem;
        }

        .error-icon {
            font-size: 2rem;
            margin-bottom: 1rem;
        }

        .error-card p {
            color: #dc2626;
            font-weight: 600;
            margin: 0;
        }

        /* History Section */
        #history-section {
            background: #fff;
            padding: 2rem;
            border-radius: 16px;
            box-shadow: 0 6px 16px rgba(0,0,0,0.1);
            margin-top: 2rem;
        }

        .history-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
        }

        .history-header h2 {
            margin: 0;
            color: #1f2937;
            font-size: 1.5rem;
        }

        .history-entry {
            background: #f8fafc;
            border: 2px solid #e2e8f0;
            border-radius: 12px;
            padding: 1rem;
            margin-bottom: 1rem;
            position: relative;
        }

        .history-entry:hover {
            border-color: #3b82f6;
            box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
        }

        .history-date {
            font-weight: 700;
            color: #1f2937;
            margin-bottom: 0.5rem;
        }

        .history-summary {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.5rem;
            font-size: 0.9rem;
            color: #6b7280;
        }

        .delete-entry {
            position: absolute;
            top: 0.5rem;
            right: 0.5rem;
            background: #ef4444;
            color: white;
            border: none;
            border-radius: 50%;
            width: 30px;
            height: 30px;
            cursor: pointer;
            font-size: 0.8rem;
            transition: background 0.2s;
        }

        .delete-entry:hover {
            background: #dc2626;
        }

        .no-history {
            text-align: center;
            color: #6b7280;
            font-style: italic;
            padding: 2rem;
        }

        .export-btn {
            background: #8b5cf6;
            color: white;
            border: none;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.9rem;
            transition: background 0.2s;
        }

        .export-btn:hover {
            background: #7c3aed;
        }

        .save-section {
            background: #f0f9ff;
            border: 2px solid #0284c7;
            border-radius: 12px;
            padding: 1rem;
            margin-top: 1rem;
        }

        .save-section h3 {
            margin: 0 0 1rem 0;
            color: #0369a1;
        }

        .date-input {
            width: calc(100% - 1.2rem);
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

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

        /* Responsive design */
        @media (max-width: 480px) {
            .pay-info {
                flex-direction: column;
                gap: 0.8rem;
            }

            .per-person, .total-role {
                width: 100%;
            }

            .results-header h3 {
                font-size: 1.2rem;
            }

            .total-amount {
                font-size: 1.1rem;
            }

            .history-header {
                flex-direction: column;
                gap: 1rem;
            }
        }

        #title {
            text-align: center;
        }