/* Health Calculator - Global Styles */
/* Modern, clean health-themed design with green/blue gradient */

:root {
    /* Primary Colors - Health Theme */
    --primary: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --secondary: #3b82f6;
    --secondary-dark: #2563eb;
    --secondary-light: #60a5fa;
    
    /* Background Colors */
    --bg-primary: #f0fdf4;
    --bg-secondary: #ecfdf5;
    --bg-card: #ffffff;
    
    /* Text Colors */
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    
    /* Border & Shadow */
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Spacing */
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #dbeafe 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    padding: 1rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
}

.logo-icon {
    font-size: 1.5rem;
}

/* Language Selector */
.lang-selector {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: var(--radius-sm);
    color: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.lang-btn:hover {
    background: rgba(255,255,255,0.3);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: white;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    display: none;
    min-width: 160px;
    z-index: 200;
}

.lang-dropdown.show {
    display: block;
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
    transition: background 0.2s;
}

.lang-option:hover {
    background: var(--bg-secondary);
}

.lang-option.active {
    background: var(--bg-primary);
    font-weight: 600;
}

/* Tab Navigation */
.tabs {
    display: flex;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 0.25rem;
    margin: 1.5rem auto;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    min-width: 120px;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--primary);
    background: var(--bg-secondary);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

/* Main Content */
.main {
    padding: 2rem 0;
}

/* Calculator Cards */
.calculator {
    display: none;
}

.calculator.active {
    display: block;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.card-header {
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

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

/* Radio & Checkbox Groups */
.radio-group,
.checkbox-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

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

.radio-option input,
.checkbox-option input {
    width: 1.25rem;
    height: 1.25rem;
    accent-color: var(--primary);
    cursor: pointer;
}

/* Toggle Switch */
.toggle-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border);
    transition: 0.3s;
    border-radius: 26px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--primary);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

.toggle-label {
    font-weight: 600;
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* Results */
.results {
    display: none;
    margin-top: 2rem;
}

.results.show {
    display: block;
}

.results-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.result-item {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #dbeafe 100%);
    border-radius: var(--radius-sm);
    padding: 1rem 1.25rem;
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.result-unit {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-left: 0.25rem;
}

/* Sleep Times Grid */
.sleep-times-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.sleep-time-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    text-align: center;
    transition: all 0.2s;
}

.sleep-time-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.sleep-time-card.highlight {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
}

.sleep-time-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.sleep-time-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.sleep-duration {
    font-size: 0.875rem;
    color: var(--primary);
    margin-top: 0.25rem;
}

/* Body Fat Visual */
.bodyfat-visual {
    margin: 1.5rem 0;
}

.bodyfat-bar {
    height: 30px;
    background: linear-gradient(to right, 
        #3b82f6 0%, 
        #10b981 15%, 
        #84cc16 30%, 
        #eab308 50%, 
        #f97316 70%, 
        #ef4444 100%);
    border-radius: 15px;
    position: relative;
}

.bodyfat-marker {
    position: absolute;
    top: -8px;
    width: 4px;
    height: 46px;
    background: var(--text-primary);
    border-radius: 2px;
    transform: translateX(-50%);
    transition: left 0.3s;
}

.bodyfat-marker::after {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 8px solid var(--text-primary);
}

/* Body Fat Categories */
.category-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.category-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.category-item.active {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(59, 130, 246, 0.2) 100%);
    font-weight: 600;
}

.category-name {
    font-weight: 600;
}

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

/* Ad Space */
.ad-space {
    background: var(--bg-secondary);
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    margin: 1.5rem 0;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: #d1d5db;
    padding: 2.5rem 0;
    margin-top: 3rem;
}

.footer-content {
    text-align: center;
}

.footer-section {
    max-width: 600px;
    margin: 0 auto 1.5rem;
    text-align: left;
    padding: 1.25rem;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-sm);
}

.footer-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: #f3f4f6;
}

.disclaimer {
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: 0;
    color: #d1d5db;
}

.privacy-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.privacy-list li {
    font-size: 0.875rem;
    line-height: 1.8;
    padding-left: 1.25rem;
    position: relative;
    color: #d1d5db;
}

.privacy-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-light);
    font-weight: 700;
}

.copyright {
    font-size: 0.8rem;
    color: #9ca3af;
    margin-top: 1rem;
}

/* Privacy Banner */
.privacy-banner {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(59, 130, 246, 0.08) 100%);
    border-bottom: 1px solid rgba(16, 185, 129, 0.2);
    padding: 0.75rem 0;
}

.privacy-badges {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.privacy-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-dark);
    white-space: nowrap;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .lang-selector {
        width: 100%;
    }
    
    .lang-btn {
        width: 100%;
        justify-content: space-between;
    }
    
    .lang-dropdown {
        width: 100%;
        right: 0;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        width: 100%;
        text-align: left;
    }
    
    .card {
        padding: 1rem;
    }
    
    .card-title {
        font-size: 1.25rem;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
    
    .result-value {
        font-size: 1.25rem;
    }
    
    .radio-group,
    .checkbox-group {
        flex-direction: column;
    }
    
    .sleep-times-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .privacy-badges {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .card {
        padding: 0.875rem;
        border-radius: var(--radius-sm);
    }
    
    .btn {
        padding: 0.75rem 1rem;
    }
    
    .sleep-times-grid {
        grid-template-columns: 1fr;
    }
    
    .category-list {
        grid-template-columns: 1fr;
    }
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* Activity Level Descriptions */
.activity-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* Input with unit */
.input-with-unit {
    display: flex;
    gap: 0.5rem;
}

.input-with-unit .form-input {
    flex: 1;
}

.unit-display {
    display: flex;
    align-items: center;
    padding: 0 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-weight: 600;
    color: var(--text-secondary);
}

/* Gender Toggle */
.gender-toggle {
    display: flex;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: 0.25rem;
}

.gender-option {
    flex: 1;
    padding: 0.75rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.gender-option:hover {
    color: var(--primary);
}

.gender-option.active {
    background: var(--bg-card);
    color: var(--primary);
    box-shadow: var(--shadow);
}

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

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* Inline Toast Message */
.toast-message {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: #ef4444;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    z-index: 9999;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
    animation: toastIn 0.3s ease-out, toastOut 0.3s ease-in 2.2s;
    pointer-events: none;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes toastOut {
    from { opacity: 1; }
    to { opacity: 0; }
}