/* Base Styles */
        :root {
            --bg-color: #a0c4ff;
            --card-bg: #ffffff;
            --text-color: #334155;
            --primary-color: #4f46e5;
            --primary-text: #ffffff;
            --border-color: #e2e8f0;
            --heading-color: #1e3a8a;
            --success-color: #10b981;
            --warning-color: #f59e0b;
            --danger-color: #ef4444;
        }
        *, *::before, *::after { 
            box-sizing: border-box; 
            margin: 0; 
            padding: 0;
            transition: all 0.3s ease;
        }
        body {
            font-family: 'Poppins', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            padding: 2rem;
            min-height: 100vh;
        }

        /* Main Layout */
        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 2px solid var(--border-color);
        }
        .header h1 { 
            color: var(--heading-color);
            font-size: 2.5rem;
            font-weight: 700;
        }
        .back-btn {
            background-color: var(--primary-color);
            color: var(--primary-text);
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            transition: background-color 0.2s ease;
        }
        .back-btn:hover {
            background-color: #3730a3;
        }

        /* Main Grid */
        .health-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .grid-panel {
            background-color: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 15px;
            padding: 1.5rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            animation: fadeIn 0.5s ease-out;
        }
        
        /* Activity Panel - Full Width */
        .activity-panel {
            background-color: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 15px;
            padding: 2rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            animation: fadeIn 0.5s ease-out;
            grid-column: 1 / -1;
        }
        
        .activity-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .grid-panel h3 {
            color: var(--heading-color);
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* BMI Card */
        .bmi-card {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 1.5rem;
            border-radius: 12px;
            text-align: center;
        }
        .bmi-value {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .bmi-category {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }
        .calorie-info {
            background: rgba(255,255,255,0.1);
            padding: 1rem;
            border-radius: 8px;
            backdrop-filter: blur(10px);
        }
        .goal-buttons {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .goal-btn {
            flex: 1;
            padding: 0.6rem;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.8rem;
            transition: transform 0.2s ease;
        }
        .goal-btn:hover {
            transform: translateY(-2px);
        }
        .weight-loss {
            background-color: var(--danger-color);
            color: white;
        }
        .weight-gain {
            background-color: var(--success-color);
            color: white;
        }

        /* Daily Tracker */
        .tracker-item { 
            margin-bottom: 2rem;
            padding: 1rem;
            background: #f8fafc;
            border-radius: 10px;
        }
        .tracker-header { 
            display: flex; 
            justify-content: space-between; 
            align-items: center; 
            margin-bottom: 0.8rem; 
        }
        .tracker-title { 
            font-weight: 600;
            font-size: 1.1rem;
        }
        .tracker-value { 
            font-size: 0.9rem; 
            color: #64748b;
            font-weight: 600;
        }
        .tracker-progress { 
            width: 100%; 
            height: 10px; 
            background-color: #e5e7eb; 
            border-radius: 6px; 
            overflow: hidden;
            margin-bottom: 1rem;
        }
        .tracker-progress-fill { 
            height: 100%; 
            transition: width 0.5s ease;
        }
        .water-fill { background: linear-gradient(90deg, #38bdf8, #0ea5e9); }
        .steps-fill { background: linear-gradient(90deg, #f59e0b, #d97706); }
        
        /* Intake Buttons */
        .intake-buttons {
            display: flex;
            gap: 0.5rem;
            justify-content: center;
        }
        .intake-btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.5rem 1rem;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.8rem;
            transition: all 0.2s ease;
        }
        .intake-btn:hover {
            background-color: #3730a3;
            transform: translateY(-1px);
        }
        .remove-btn {
            background-color: var(--danger-color);
            color: white;
            border: none;
            padding: 0.5rem 1rem;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.8rem;
            transition: all 0.2s ease;
        }
        .remove-btn:hover {
            background-color: #dc2626;
            transform: translateY(-1px);
        }

        /* Calories Info */
        .calories-info {
            text-align: center;
            padding: 1rem;
        }
        .calories-big {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--warning-color);
            margin-bottom: 0.5rem;
            display: block;
        }
        .calories-info small {
            font-size: 0.8rem;
            color: #64748b;
            font-weight: normal;
        }

        /* Sleep Tracker */
        .sleep-summary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 1.5rem;
            border-radius: 12px;
            text-align: center;
        }
        .sleep-duration {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        .sleep-quality {
            font-size: 1rem;
        }
        .sleep-icon {
            margin-right: 0.5rem;
        }
        .sleep-tips {
            margin-top: 1rem;
            padding: 1rem;
            background: #f8fafc;
            border-radius: 8px;
        }
        .sleep-tips h4 {
            color: var(--heading-color);
            margin-bottom: 0.8rem;
            font-size: 1rem;
        }
        .sleep-tips ul {
            list-style: none;
            padding: 0;
        }
        .sleep-tips li {
            padding: 0.3rem 0;
            color: #64748b;
            font-size: 0.9rem;
        }
        .sleep-tips li:before {
            content: "✓ ";
            color: var(--success-color);
            font-weight: bold;
        }
        
        /* Health Goals */
        .goals-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 1rem;
        }
        .goal-item {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            color: white;
            padding: 1rem;
            border-radius: 8px;
            text-align: center;
            transition: transform 0.3s ease;
        }
        .goal-item:hover {
            transform: translateY(-3px);
        }
        .goal-icon {
            font-size: 1.5rem;
            margin-bottom: 0.3rem;
            display: block;
        }
        .goal-title {
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 0.3rem;
        }
        .goal-desc {
            font-size: 0.7rem;
            opacity: 0.9;
            line-height: 1.2;
        }
        .goal-item:nth-child(1) { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
        .goal-item:nth-child(2) { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
        .goal-item:nth-child(3) { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
        .goal-item:nth-child(4) { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
        
        /* Chart */
        .chart-container { height: 300px; }

        /* Form */
        .metric-form { 
            display: flex; 
            flex-direction: column; 
            gap: 1rem; 
        }
        .form-row { 
            display: flex; 
            gap: 1rem; 
        }
        .form-group { 
            flex: 1; 
            display: flex; 
            flex-direction: column; 
            gap: 0.5rem; 
        }
        .form-group label { 
            font-weight: 600; 
            font-size: 0.9rem;
            color: var(--heading-color);
        }
        .form-group input, .form-group select { 
            padding: 0.8rem; 
            border: 1px solid var(--border-color); 
            border-radius: 8px;
            font-family: 'Poppins', sans-serif;
            font-size: 0.9rem;
        }
        .form-group input:focus, .form-group select:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
        }
        .submit-btn {
            background-color: var(--success-color);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            font-family: 'Poppins', sans-serif;
            transition: all 0.2s ease;
        }
        .submit-btn:hover {
            background-color: #059669;
            transform: translateY(-1px);
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            body { padding: 1rem; }
            .health-grid { 
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .activity-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .goals-grid {
                grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
                gap: 0.8rem;
            }
            .form-row { flex-direction: column; }
            .header h1 { font-size: 2rem; }
            .intake-buttons { flex-wrap: wrap; }
            .goal-buttons { flex-direction: column; }
        }