:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #f3f4f6;
    --text-color: #1f2937;
    --light-text: #6b7280;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --card-bg: #ffffff;
    --body-bg: #f9fafb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s ease;
    --background: linear-gradient(135deg, #f9fafb, #4f46e5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    
}

body {
    font-family: 'Inter', sans-serif;
    background-image: linear-gradient( 180deg,#cedbff, #758ded, #83a4d0, #b8c6db, #16283f);
    /* background-image: linear-gradient(to right, rgb(159, 202, 245) , rgb(177, 183, 231), rgb(90, 170, 250)); */
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.calculator-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 32px;
    margin-bottom: 20px;
    transition: var(--transition);
}

h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-color);
    text-align: center;
}

.subtitle {
    text-align: center;
    color: var(--light-text);
    margin-bottom: 24px;
}

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

.form-row {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

input[type="number"],
select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: var(--transition);
    outline: none;
    color: var(--text-color);
}

input[type="number"]:focus,
select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.input-with-unit {
    position: relative;
}

.unit {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--light-text);
    pointer-events: none;
}

.input-with-unit input {
    padding-right: 40px;
}

.gender-toggle {
    display: flex;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.gender-toggle input[type="radio"] {
    display: none;
}

.radio-label {
    flex: 1;
    text-align: center;
    padding: 12px;
    cursor: pointer;
    transition: var(--transition);
    margin: 0;
    background-color: var(--secondary-color);
    color: var(--light-text);
}

.gender-toggle input[type="radio"]:checked + .radio-label {
    background-color: var(--primary-color);
    color: white;
}

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

#calculate-btn {
    background-color: var(--primary-color);
    color: white;
    flex: 2;
}

#calculate-btn:hover {
    background-color: var(--primary-hover);
}

#reset-btn {
    background-color: var(--secondary-color);
    color: var(--text-color);
    flex: 1;
}

#reset-btn:hover {
    background-color: var(--border-color);
}

#result {
    margin-top: 32px;
    transition: var(--transition);
    opacity: 1;
    max-height: 1000px;
    overflow: hidden;
}

.result-hidden {
    opacity: 0;
    max-height: 0;
    margin-top: 0 !important;
}

.result-card {
    background-color: var(--secondary-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    margin-top: 10px;
}

.result-card h2 {
    font-size: 20px;
    margin-bottom: 16px;
    text-align: center;
}

.result-item {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.result-label {
    flex: 1;
    min-width: 180px;
    font-weight: 500;
}

.result-value {
    font-weight: 700;
    font-size: 20px;
    color: var(--primary-color);
    margin: 0 8px;
}

.calorie-goals {
    display: flex;
    justify-content: space-between;
    margin-top: 24px;
    gap: 12px;
}

.goal-item {
    flex: 1;
    background-color: white;
    padding: 16px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.goal-label {
    display: block;
    font-size: 14px;
    color: var(--light-text);
    margin-bottom: 4px;
}

.goal-value {
    display: block;
    font-weight: 700;
    font-size: 18px;
    color: var(--primary-color);
}

.goal-unit {
    font-size: 12px;
    color: var(--light-text);
}

.info-card {
    background-color: hsl(180, 17%, 98%);
    border-radius: 12px;
    padding: 20px;
    border-left: 4px solid var(--primary-color);
}

.info-card h3 {
    margin-bottom: 12px;
    font-size: 18px;
}

.info-card p {
    color: var(--light-text);
    font-size: 14px;
    margin-bottom: 8px;
}

/* Responsive styles */
@media (max-width: 768px) {
    .calculator-card {
        padding: 24px;
    }
    
    .form-row {
        flex-direction: column;
        gap: 20px;
    }
    
    .calorie-goals {
        flex-direction: column;
    }
    
    .goal-item {
        margin-bottom: 8px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    #calculate-btn, #reset-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .calculator-card {
        padding: 20px;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .result-value {
        margin: 4px 0;
    }
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-card {
    animation: fadeIn 0.5s ease-out;
}