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<?php
// Inisialisasi variabel
$bmi = isset($_GET['bmi']) ? $_GET['bmi'] : null;
$category = isset($_GET['category']) ? $_GET['category'] : null;
$error = isset($_GET['error']) ? $_GET['error'] : null;
?>
<!DOCTYPE html>
<html lang="id">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Kalkulator BMI</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Poppins', sans-serif;
        }

        body {
            min-height: 100vh;
            background: linear-gradient(135deg, #00416A, #E4E5E6);
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .container {
            background: rgba(255, 255, 255, 0.95);
            padding: 35px;
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
            width: 100%;
            max-width: 450px;
            position: relative;
            overflow: hidden;
        }

        .container::before {
            content: '';
            position: absolute;
            top: 0;
            left: -50%;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, #00416A, #E4E5E6);
        }

        h1 {
            text-align: center;
            color: #00416A;
            margin-bottom: 30px;
            font-size: 2.2em;
            font-weight: 600;
            position: relative;
        }

        .form-group {
            margin-bottom: 25px;
            position: relative;
        }

        label {
            display: block;
            margin-bottom: 10px;
            color: #2d3748;
            font-weight: 500;
            font-size: 1.1em;
        }

        input {
            width: 100%;
            padding: 15px;
            border: 2px solid #e2e8f0;
            border-radius: 10px;
            font-size: 16px;
            transition: all 0.3s ease;
            background: #f8fafc;
        }

        input:focus {
            outline: none;
            border-color: #00416A;
            box-shadow: 0 0 10px rgba(0, 65, 106, 0.1);
            background: #fff;
        }

        button {
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, #00416A, #0073b8);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 10px;
        }

        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 65, 106, 0.3);
        }

        .result {
            margin-top: 30px;
            padding: 20px;
            border-radius: 10px;
            text-align: center;
            animation: fadeIn 0.5s ease;
        }

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

        .result h2 {
            color: #2d3748;
            margin-bottom: 15px;
            font-size: 1.5em;
        }

        .result p {
            color: #4a5568;
            font-size: 1.2em;
            margin: 10px 0;
        }

        .category-text {
            font-weight: 600;
            font-size: 1.3em;
            margin-top: 15px;
        }

        .result.kurus {
            background: #ebf8ff;
            border: 2px solid #4299e1;
        }

        .result.normal {
            background: #f0fff4;
            border: 2px solid #48bb78;
        }

        .result.kelebihan {
            background: #fffaf0;
            border: 2px solid #ed8936;
        }

        .result.obesitas {
            background: #fff5f5;
            border: 2px solid #f56565;
        }

        .error {
            background: #fff5f5;
            color: #c53030;
            padding: 15px;
            border-radius: 10px;
            text-align: center;
            margin-top: 20px;
            border: 2px solid #fc8181;
        }

        @media (max-width: 480px) {
            .container {
                padding: 20px;
            }

            h1 {
                font-size: 1.8em;
            }

            input {
                padding: 12px;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Kalkulator BMI</h1>
        <form action="proses.php" method="POST">
            <div class="form-group">
                <label for="berat">Berat Badan (kg)</label>
                <input type="number" id="berat" name="berat" required step="0.1" 
                       placeholder="Masukkan berat badan">
            </div>
            
            <div class="form-group">
                <label for="tinggi">Tinggi Badan (m)</label>
                <input type="number" id="tinggi" name="tinggi" required step="0.01" 
                       placeholder="Masukkan tinggi badan">
            </div>
            
            <button type="submit">Hitung BMI</button>
        </form>

        <?php if ($error): ?>
            <div class="error">
                <p><?php echo htmlspecialchars($error); ?></p>
            </div>
        <?php endif; ?>

        <?php if ($bmi !== null && $category !== null): ?>
            <div class="result <?php echo strtolower(str_replace(' ', '-', $category)); ?>">
                <h2>Hasil Perhitungan</h2>
                <p>BMI Anda: <strong><?php echo number_format($bmi, 2); ?></strong></p>
                <p class="category-text">Kategori: <strong><?php echo htmlspecialchars($category); ?></strong></p>
            </div>
        <?php endif; ?>
    </div>
</body>
</html>
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