* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        :root {
            --primary-gradient: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            --dark-color: #1a1a2e;
            --light-color: #f8f9fa;
            --card-bg: rgba(255, 255, 255, 0.95);
            --shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            --border-radius: 20px;
            --accent-color: #4361ee;
            --success-color: #4cc9f0;
            --warning-color: #f72585;
        }

        body {
            background: var(--primary-gradient);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            color: var(--dark-color);
        }

        .container {
            width: 100%;
            max-width: 1200px;
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
        }

        @media (min-width: 992px) {
            .container {
                grid-template-columns: 1fr 1fr;
            }
        }

        .calculator-card, .results-card {
            background: var(--card-bg);
            border-radius: var(--border-radius);
            padding: 40px 30px;
            box-shadow: var(--shadow);
            backdrop-filter: blur(10px);
            transition: transform 0.3s ease;
        }

        .calculator-card:hover, .results-card:hover {
            transform: translateY(-5px);
        }

        .card-header {
            display: flex;
            align-items: center;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 2px solid #f0f0f0;
        }

        .card-header i {
            font-size: 28px;
            margin-right: 15px;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .card-header h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--dark-color);
        }

        .premium-badge {
            background: var(--secondary-gradient);
            color: white;
            padding: 5px 15px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            margin-left: auto;
            display: flex;
            align-items: center;
            letter-spacing: 0.5px;
        }

        .premium-badge i {
            color: white;
            margin-right: 5px;
            font-size: 12px;
        }

        .input-group {
            margin-bottom: 25px;
        }

        .input-group label {
            display: block;
            margin-bottom: 10px;
            font-weight: 600;
            color: #555;
            font-size: 16px;
        }

        .input-group input, .input-group select {
            width: 100%;
            padding: 15px 20px;
            border: 2px solid #e1e5ee;
            border-radius: 12px;
            font-size: 16px;
            transition: all 0.3s;
            background-color: white;
        }

        .input-group input:focus, .input-group select:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }

        .date-inputs {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 15px;
        }

        .buttons {
            display: flex;
            gap: 15px;
            margin-top: 30px;
        }

        .btn {
            flex: 1;
            padding: 16px;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .btn i {
            margin-right: 10px;
        }

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

        .btn-primary:hover {
            box-shadow: 0 10px 20px rgba(106, 17, 203, 0.3);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background: #f0f2f5;
            color: #555;
        }

        .btn-secondary:hover {
            background: #e4e6e9;
            transform: translateY(-2px);
        }

        .results-container {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }

        .main-result {
            background: var(--primary-gradient);
            color: white;
            padding: 30px;
            border-radius: 16px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(106, 17, 203, 0.2);
        }

        .main-result h3 {
            font-size: 18px;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .age-display {
            font-size: 56px;
            font-weight: 800;
            line-height: 1;
            margin: 10px 0;
        }

        .age-unit {
            font-size: 20px;
            font-weight: 500;
            opacity: 0.9;
        }

        .detailed-results {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .result-box {
            background: #f8f9ff;
            border-radius: 12px;
            padding: 20px;
            text-align: center;
            border: 1px solid #eef0ff;
        }

        .result-value {
            font-size: 28px;
            font-weight: 700;
            color: var(--accent-color);
            margin: 5px 0;
        }

        .result-label {
            font-size: 14px;
            color: #666;
            font-weight: 600;
        }

        .extra-features {
            margin-top: 30px;
            padding-top: 25px;
            border-top: 2px solid #f0f0f0;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 20px;
        }

        .feature-box {
            background: #f8f9ff;
            border-radius: 12px;
            padding: 20px;
            text-align: center;
            transition: transform 0.3s ease;
        }

        .feature-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
        }

        .feature-box i {
            font-size: 24px;
            margin-bottom: 15px;
            color: var(--accent-color);
        }

        .feature-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .feature-value {
            font-size: 18px;
            font-weight: 700;
            color: var(--dark-color);
        }

        .footer-note {
            margin-top: 30px;
            text-align: center;
            font-size: 14px;
            color: #777;
            padding-top: 20px;
            border-top: 1px solid #eee;
        }

        .error-message {
            color: var(--warning-color);
            font-size: 14px;
            margin-top: 10px;
            display: none;
        }

        @media (max-width: 768px) {
            .calculator-card, .results-card {
                padding: 30px 20px;
            }
            
            .detailed-results {
                grid-template-columns: 1fr;
            }
            
            .buttons {
                flex-direction: column;
            }
            
            .age-display {
                font-size: 42px;
            }
        }

        @media (max-width: 480px) {
            .date-inputs {
                grid-template-columns: 1fr;
            }
            
            .card-header h2 {
                font-size: 24px;
            }
        }

        .history-section {
            margin-top: 30px;
            padding-top: 25px;
            border-top: 2px solid #f0f0f0;
            max-height: 200px;
            overflow-y: auto;
        }

        .history-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
        }

        .history-title i {
            margin-right: 10px;
            color: var(--accent-color);
        }

        .history-item {
            background: #f8f9ff;
            border-radius: 10px;
            padding: 12px 15px;
            margin-bottom: 10px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-left: 4px solid var(--accent-color);
        }

        .history-date {
            font-weight: 600;
            color: var(--dark-color);
        }

        .history-age {
            color: var(--accent-color);
            font-weight: 600;
        }

        .empty-history {
            text-align: center;
            color: #999;
            font-style: italic;
            padding: 20px;
        }