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

:root {
    --primary: #0891b2;
    --primary-dark: #0e7490;
    --background: #ffffff;
    --foreground: #1e293b;
    --card: #f8fafc;
    --card-border: #e2e8f0;
    --muted: #64748b;
    --success: #10b981;
    --error: #ef4444;
    --radius: 8px;
    --spacing: 1rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    background-color: var(--background);
    color: var(--foreground);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.container-wide {
    max-width: 1200px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.hero p {
    font-size: 1.125rem;
    color: var(--muted);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-image {
    width: 100%;
    max-width: 500px;
    height: 300px;
    margin: 2rem auto;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    color: var(--foreground);
    border: 2px solid var(--card-border);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--card);
}

/* Cards */
.card {
    background-color: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.card h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--foreground);
}

/* Grid */
.grid {
    display: grid;
    gap: 1.5rem;
    margin-top: 2rem;
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--foreground);
}

.required::after {
    content: " *";
    color: var(--error);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    border: 2px solid var(--card-border);
    border-radius: var(--radius);
    background-color: white;
    transition: border-color 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-hint {
    font-size: 0.875rem;
    color: var(--muted);
    margin-top: 0.25rem;
}

/* Radio Groups */
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.radio-option {
    flex: 1;
    min-width: 150px;
}

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

.radio-label {
    display: block;
    padding: 0.75rem 1rem;
    border: 2px solid var(--card-border);
    border-radius: var(--radius);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
    background-color: white;
}

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

.radio-label:hover {
    border-color: var(--primary);
}

/* Checkbox Groups */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-option input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
}

.checkbox-label {
    cursor: pointer;
    user-select: none;
}

/* Slider */
.slider-container {
    margin: 1rem 0;
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--card-border);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
}

.slider-value {
    display: inline-block;
    margin-left: 1rem;
    font-weight: 600;
    color: var(--primary);
}

/* Progress Indicator */
.progress {
    margin-bottom: 2rem;
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.progress-step {
    flex: 1;
    text-align: center;
    position: relative;
    padding-bottom: 0.5rem;
}

.progress-step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 15px;
    left: 50%;
    right: -50%;
    height: 2px;
    background-color: var(--card-border);
    z-index: -1;
}

.progress-step.active:not(:last-child)::after,
.progress-step.completed:not(:last-child)::after {
    background-color: var(--primary);
}

.progress-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--card);
    border: 2px solid var(--card-border);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.progress-step.active .progress-number {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.progress-step.completed .progress-number {
    background-color: var(--success);
    color: white;
    border-color: var(--success);
}

.progress-label {
    font-size: 0.875rem;
    color: var(--muted);
}

.progress-step.active .progress-label {
    color: var(--primary);
    font-weight: 600;
}

/* Navigation */
.form-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2rem;
}

/* Summary */
.summary-card {
    background-color: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 2rem;
}

.summary-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--card-border);
}

.summary-header h1 {
    font-size: 2rem;
    color: var(--foreground);
    margin-bottom: 0.5rem;
}

.summary-section {
    margin-bottom: 2rem;
}

.summary-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--foreground);
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 0.5rem;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--card-border);
}

.summary-item:last-child {
    border-bottom: none;
}

.summary-label {
    font-weight: 500;
    color: var(--muted);
}

.summary-value {
    font-weight: 600;
    color: var(--foreground);
    text-align: right;
}

.bmi-indicator {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.875rem;
}

.bmi-underweight {
    background-color: #fef3c7;
    color: #92400e;
}

.bmi-normal {
    background-color: #d1fae5;
    color: #065f46;
}

.bmi-overweight {
    background-color: #fed7aa;
    color: #9a3412;
}

.bmi-obese {
    background-color: #fecaca;
    color: #991b1b;
}

.summary-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background-color: var(--foreground);
    color: white;
    border-radius: var(--radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    opacity: 0;
    transform: translateY(100px);
    transition: all 0.3s;
    z-index: 1000;
    max-width: 400px;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.error {
    background-color: var(--error);
}

.toast.success {
    background-color: var(--success);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

.mb-2 {
    margin-bottom: 0.5rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.hidden {
    display: none;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .progress-label {
        font-size: 0.75rem;
    }
    
    .radio-option {
        min-width: 100%;
    }
    
    .form-navigation {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .summary-actions {
        flex-direction: column;
    }
}

@media print {
    .btn,
    .form-navigation,
    .summary-actions {
        display: none;
    }
}