@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;700&display=swap');

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 16px;
    --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background: linear-gradient(135deg, #eef2ff 0%, #fae8ff 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-main);
    padding: 20px;
    position: relative;
    /* Ensure z-index works if needed */
}

.global-header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

.logo-link img {
    height: 48px;
    width: auto;
    transition: var(--transition);
}

.logo-link:hover img {
    transform: scale(1.05);
    opacity: 0.9;
}

.header-title {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.container {
    width: 100%;
    max-width: 480px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
    padding: 40px;
    border: 1px solid rgba(255, 255, 255, 0.8);
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 32px;
}

h1 {
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

p.subtitle {
    color: var(--text-muted);
    font-size: 14px;
}

.input-group {
    margin-bottom: 24px;
}

label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-main);
    font-size: 14px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

input[type="number"] {
    width: 100%;
    padding: 16px;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius);
    font-family: 'Outfit', sans-serif;
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
    background: #f8fafc;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.unit {
    position: absolute;
    right: 16px;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 14px;
}

.gender-toggle {
    display: flex;
    background: #f1f5f9;
    padding: 4px;
    border-radius: var(--radius);
    margin-bottom: 32px;
}

.gender-option {
    flex: 1;
    text-align: center;
}

.gender-option input {
    display: none;
}

.gender-option span {
    display: block;
    padding: 12px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-muted);
    transition: var(--transition);
    font-size: 14px;
}

.gender-option input:checked+span {
    background: white;
    color: var(--primary);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.btn-primary {
    width: 100%;
    padding: 18px;
    border: none;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 10px 20px -5px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px -5px rgba(79, 70, 229, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

#result-card {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 2px dashed #e2e8f0;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
    pointer-events: none;
    display: none;
    /* Hidden by default */
}

#result-card.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    display: block;
}

.bmi-score {
    text-align: center;
    margin-bottom: 24px;
}

.bmi-value {
    font-size: 48px;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.2;
}

.bmi-status {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 14px;
    margin-top: 8px;
}

.status-underweight {
    background: #fee2e2;
    color: #ef4444;
}

.status-normal {
    background: #d1fae5;
    color: #10b981;
}

.status-overweight {
    background: #ffedd5;
    color: #f97316;
}

.status-obese {
    background: #fee2e2;
    color: #dc2626;
}

.target-section {
    background: #f8fafc;
    border-radius: 20px;
    padding: 24px;
}

.target-title {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: 16px;
    text-align: center;
}

.target-grid {
    display: grid;
    gap: 16px;
}

.target-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: white;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
}

.target-label {
    display: flex;
    flex-direction: column;
}

.target-percent {
    font-weight: 700;
    color: var(--text-main);
    font-size: 16px;
}

.target-desc {
    font-size: 12px;
    color: var(--text-muted);
}

.target-value {
    text-align: right;
}

.target-weight {
    font-weight: 700;
    font-size: 18px;
    color: var(--primary);
}

.target-diff {
    font-size: 12px;
    font-weight: 500;
}

.diff-gain {
    color: var(--secondary);
}

.diff-lose {
    color: var(--success);
}

.diff-maintain {
    color: var(--text-muted);
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate {
    animation: fadeIn 0.5s ease forwards;
}