/* ===================================
   PREGNANCY CALCULATOR STYLES
   CalcTechLab Design System
   =================================== */

/* ===================================
   BASE STYLES
   =================================== */

.pregnancy-calculator-container {
    background: var(--bg-primary);
}

/* ===================================
   METHOD TABS
   =================================== */

.method-tabs {
    display: flex;
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab-button {
    flex: 1;
    min-width: 140px;
    padding: var(--spacing-md, 1rem) var(--spacing-sm, 0.5rem);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.tab-button:hover {
    background: rgba(6, 182, 212, 0.05);
    color: var(--brand-primary);
}

.tab-button.active {
    background: var(--bg-primary);
    border-bottom-color: var(--brand-primary);
    color: var(--brand-primary);
    font-weight: 600;
}

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

.tab-label {
    font-size: 0.85rem;
}

/* ===================================
   CALCULATOR SECTION
   =================================== */

.calculator-section {
    padding: var(--spacing-xl, 1.5rem);
}

.method-panel {
    display: none;
}

.method-panel.active {
    display: block;
    animation: fadeIn var(--transition-base);
}

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

.method-panel h2 {
    font-size: 1.75rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm, 0.5rem);
}

.method-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl, 1.5rem);
    font-size: 1rem;
}

/* ===================================
   FORMS
   =================================== */

.calculator-form {
    max-width: 600px;
}

.form-group {
    margin-bottom: var(--spacing-xl, 1.5rem);
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm, 0.5rem);
    font-size: 1rem;
}

.form-group input[type="date"],
.form-group input[type="number"] {
    width: 100%;
    padding: var(--spacing-md, 1rem);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-base);
    background: var(--bg-input);
}

.form-group input:focus {
    outline: none;
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.helper-text {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs, 0.25rem);
}

/* Input with Slider */
.input-with-slider {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm, 0.5rem);
    margin-bottom: var(--spacing-sm, 0.5rem);
}

.input-with-slider input[type="number"] {
    width: 100px;
}

.unit {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Range Slider */
.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    margin: var(--spacing-sm, 0.5rem) 0;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--brand-primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--brand-primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs, 0.25rem);
}

/* Dual Input */
.dual-input {
    display: flex;
    gap: var(--spacing-md, 1rem);
}

.input-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm, 0.5rem);
}

/* Radio Group */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md, 1rem);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm, 0.5rem);
    cursor: pointer;
    padding: var(--spacing-md, 1rem);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.radio-label:hover {
    border-color: var(--primary-300);
    background: rgba(6, 182, 212, 0.02);
}

.radio-label input[type="radio"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

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

.radio-text {
    font-weight: 500;
    color: var(--text-primary);
}

/* Calculate Button */
.calculate-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm, 0.5rem);
    width: 100%;
    padding: var(--spacing-md, 1rem) var(--spacing-xl, 1.5rem);
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.calculate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.calculate-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-icon {
    font-size: 1.3rem;
}

/* ===================================
   RESULTS SECTION
   =================================== */

.results-section {
    display: none;
    padding: var(--spacing-xl, 1.5rem);
    background: var(--bg-secondary);
    border-top: 2px solid var(--border-color);
}

.results-section.show {
    display: block;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl, 1.5rem);
    flex-wrap: wrap;
    gap: var(--spacing-md, 1rem);
}

.results-header h2 {
    font-size: 2rem;
    color: var(--text-primary);
}

.results-actions {
    display: flex;
    gap: var(--spacing-sm, 0.5rem);
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs, 0.25rem);
    padding: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.action-btn:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Result Cards */
.result-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl, 1.5rem);
    margin-bottom: var(--spacing-lg, 1.25rem);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.result-card:hover {
    box-shadow: var(--shadow-lg);
}

.result-card h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg, 1.25rem);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm, 0.5rem);
}

/* Key Dates Card */
.dates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg, 1.25rem);
}

.date-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs, 0.25rem);
}

.date-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.date-value {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* Status Card */
.status-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg, 1.25rem);
}

.status-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md, 1rem);
}

.week-display {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm, 0.5rem);
}

.week-number,
.day-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--brand-primary);
}

.week-label,
.day-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.trimester-badge {
    padding: var(--spacing-sm, 0.5rem) var(--spacing-lg, 1.5rem);
    background: linear-gradient(135deg, var(--primary-300) 0%, var(--brand-primary) 100%);
    color: white;
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: 0.9rem;
    transition: background var(--transition-base);
}

/* Progress Bar */
.progress-bar {
    position: relative;
    width: 100%;
    height: 40px;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
    border-radius: var(--radius-xl);
    transition: width var(--transition-slow);
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.days-remaining {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.days-remaining span {
    font-weight: 700;
    color: var(--brand-primary);
    font-size: 1.3rem;
}

/* Baby Size Card */
.baby-size-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl, 1.5rem);
    align-items: center;
}

.baby-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

#baby-canvas {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

.baby-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg, 1.25rem);
}

.size-comparison {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs, 0.25rem);
}

.comparison-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.comparison-item {
    font-size: 2rem;
    font-weight: 700;
    color: var(--brand-primary);
}

.measurements {
    display: flex;
    gap: var(--spacing-xl, 1.5rem);
}

.measurement-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs, 0.25rem);
}

.measurement-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.measurement-value {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
}

.development-note {
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.6;
}

/* Timeline Card */
.timeline-container {
    padding: var(--spacing-lg, 1.25rem) 0;
}

.timeline-track {
    position: relative;
    display: flex;
    height: 80px;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.timeline-segment {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md, 1rem);
    color: white;
    font-weight: 600;
    position: relative;
}

.first-trimester {
    background: linear-gradient(135deg, var(--primary-300) 0%, var(--primary-200) 100%);
}

.second-trimester {
    background: linear-gradient(135deg, var(--primary-400) 0%, var(--primary-300) 100%);
}

.third-trimester {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-400) 100%);
}

.segment-label {
    font-size: 1rem;
}

.segment-weeks {
    font-size: 0.8rem;
    opacity: 0.9;
}

.timeline-marker {
    position: absolute;
    top: -10px;
    width: 20px;
    height: 100px;
    background: var(--bg-primary);
    border: 3px solid var(--brand-primary);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    transition: left var(--transition-slow);
    z-index: 10;
}

.timeline-marker::after {
    content: '📍';
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.5rem;
}

/* Important Dates Card */
.important-dates-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md, 1rem);
}

.important-date-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md, 1rem);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--brand-primary);
    transition: all var(--transition-base);
}

.important-date-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.2);
}

.date-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs, 0.25rem);
}

.date-title {
    font-weight: 600;
    color: var(--text-primary);
}

.date-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.date-when {
    font-weight: 600;
    color: var(--brand-primary);
    white-space: nowrap;
    margin-left: var(--spacing-lg, 1.5rem);
}

/* Week Navigation Card */
.week-navigation {
    margin-bottom: var(--spacing-lg, 1.25rem);
}

.week-selector {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md, 1rem);
    margin-bottom: var(--spacing-xl, 1.5rem);
}

.week-nav-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--brand-primary);
    color: white;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.week-nav-btn:hover:not(:disabled) {
    background: var(--brand-secondary);
    transform: scale(1.1);
}

.week-nav-btn:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    transform: scale(1);
    opacity: 0.5;
}

.week-display-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm, 0.5rem);
    font-size: 1.2rem;
    font-weight: 600;
}

.week-dropdown {
    padding: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    background: var(--bg-input);
    transition: all var(--transition-base);
}

.week-dropdown:focus {
    outline: none;
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.week-details {
    padding: var(--spacing-xl, 1.5rem);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* Week Info Styling */
.week-info-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg, 1.25rem);
    padding-bottom: var(--spacing-md, 1rem);
    border-bottom: 2px solid var(--border-color);
}

.week-info-header h4 {
    margin: 0;
    color: var(--brand-primary);
    font-size: 1.5rem;
}

.week-trimester {
    background: linear-gradient(135deg, var(--primary-300) 0%, var(--brand-primary) 100%);
    color: white;
    padding: var(--spacing-xs, 0.25rem) var(--spacing-md, 1rem);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 600;
}

.week-info-section {
    margin-bottom: var(--spacing-lg, 1.25rem);
    padding: var(--spacing-md, 1rem);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--brand-primary);
}

.week-info-section h5 {
    margin: 0 0 var(--spacing-sm, 0.5rem) 0;
    color: var(--brand-primary);
    font-size: 1.1rem;
    font-weight: 600;
}

.week-info-section p {
    margin: var(--spacing-xs, 0.25rem) 0;
    line-height: 1.6;
    color: var(--text-secondary);
}

.week-info-section strong {
    color: var(--text-primary);
}

/* ===================================
   NOTIFICATIONS
   =================================== */

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: var(--spacing-md, 1rem) var(--spacing-lg, 1.5rem);
    border-radius: var(--radius-md);
    color: white;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    max-width: 400px;
    animation: slideIn 0.3s ease-out;
}

.notification-success {
    background: var(--success);
}

.notification-error {
    background: var(--danger);
}

.notification-info {
    background: var(--info);
}

.notification-warning {
    background: var(--warning);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* ===================================
   CONTENT SECTION
   =================================== */

.content-section {
    padding: var(--spacing-2xl, 3rem) var(--spacing-xl, 1.5rem);
    background: var(--bg-primary);
}

.content-article {
    max-width: 900px;
    margin: 0 auto;
}

.content-article h2 {
    font-size: 2rem;
    color: var(--text-primary);
    margin: var(--spacing-2xl, 3rem) 0 var(--spacing-lg, 1.25rem);
}

.content-article h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: var(--spacing-xl, 1.5rem) 0 var(--spacing-md, 1rem);
}

.content-article h4 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin: var(--spacing-lg, 1.25rem) 0 var(--spacing-sm, 0.5rem);
}

.content-article p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md, 1rem);
}

.content-article ul {
    margin: var(--spacing-md, 1rem) 0;
    padding-left: var(--spacing-xl, 1.5rem);
}

.content-article li {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm, 0.5rem);
}

/* FAQ Section */
.faq-section {
    margin-top: var(--spacing-2xl, 3rem);
}

.faq-item {
    margin-bottom: var(--spacing-xl, 1.5rem);
    padding: var(--spacing-xl, 1.5rem);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--brand-primary);
}

.faq-item h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md, 1rem);
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 768px) {
    .method-tabs {
        overflow-x: auto;
    }
    
    .tab-button {
        min-width: 100px;
        padding: var(--spacing-sm, 0.5rem);
    }
    
    .tab-icon {
        font-size: 1.2rem;
    }
    
    .tab-label {
        font-size: 0.75rem;
    }
    
    .calculator-section,
    .results-section {
        padding: var(--spacing-lg, 1.25rem);
    }
    
    .dates-grid {
        grid-template-columns: 1fr;
    }
    
    .baby-size-content {
        grid-template-columns: 1fr;
    }
    
    .week-number,
    .day-number {
        font-size: 2rem;
    }
    
    .comparison-item {
        font-size: 1.5rem;
    }
    
    .timeline-track {
        height: 60px;
    }
    
    .segment-label {
        font-size: 0.8rem;
    }
    
    .segment-weeks {
        font-size: 0.7rem;
    }
    
    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .results-actions {
        width: 100%;
        flex-wrap: wrap;
    }
    
    .action-btn {
        flex: 1;
        min-width: 100px;
    }
    
    .measurements {
        flex-direction: column;
        gap: var(--spacing-md, 1rem);
    }
    
    .important-date-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .date-when {
        margin-left: 0;
        margin-top: var(--spacing-sm, 0.5rem);
    }
    
    .week-info-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .week-trimester {
        margin-top: var(--spacing-sm, 0.5rem);
    }
    
    .notification {
        left: var(--spacing-md, 1rem);
        right: var(--spacing-md, 1rem);
        top: var(--spacing-md, 1rem);
        max-width: none;
    }
}

@media (max-width: 480px) {
    .method-panel h2 {
        font-size: 1.3rem;
    }
    
    .results-header h2 {
        font-size: 1.5rem;
    }
    
    .result-card {
        padding: var(--spacing-md, 1rem);
    }
    
    .result-card h3 {
        font-size: 1.2rem;
    }
    
    .measurements {
        flex-direction: column;
        gap: var(--spacing-md, 1rem);
    }
    
    .week-nav-btn {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    .week-display-selector {
        font-size: 1rem;
    }
    
    .week-dropdown {
        font-size: 0.95rem;
        padding: var(--spacing-xs, 0.25rem) var(--spacing-sm, 0.5rem);
    }
}

/* ===================================
   PRINT STYLES
   =================================== */

@media print {
    .method-tabs,
    .calculator-section,
    .results-actions,
    .content-section,
    .week-navigation,
    .action-btn,
    .calculate-btn {
        display: none !important;
    }
    
    .results-section {
        display: block !important;
        background: white;
        padding: var(--spacing-lg, 1.25rem);
    }
    
    .result-card {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid var(--border-color);
        margin-bottom: var(--spacing-lg, 1.25rem);
    }
    
    .week-details {
        page-break-inside: avoid;
    }
}

/* ===================================
   LOADING STATES
   =================================== */

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===================================
   ACCESSIBILITY
   =================================== */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus styles for keyboard navigation */
*:focus-visible {
    outline: 3px solid var(--brand-primary);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 3px solid var(--brand-primary);
    outline-offset: 2px;
}

/* ===================================
   ERROR STATES
   =================================== */

.form-group.error input {
    border-color: var(--danger);
}

.form-group.error .helper-text {
    color: var(--danger);
}

.error-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm, 0.5rem);
    padding: var(--spacing-md, 1rem);
    background: var(--danger-bg);
    border-left: 4px solid var(--danger);
    border-radius: var(--radius-md);
    color: var(--danger);
    margin-top: var(--spacing-md, 1rem);
}

/* ===================================
   SUCCESS STATES
   =================================== */

.success-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm, 0.5rem);
    padding: var(--spacing-md, 1rem);
    background: var(--success-bg);
    border-left: 4px solid var(--success);
    border-radius: var(--radius-md);
    color: var(--success);
    margin-top: var(--spacing-md, 1rem);
}

/* ===================================
   SPECIAL MILESTONE BADGES
   =================================== */

.milestone-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs, 0.25rem);
    padding: var(--spacing-xs, 0.25rem) var(--spacing-md, 1rem);
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    color: white;
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: var(--shadow-md);
    animation: pulse 2s infinite;
}

.milestone-badge::before {
    content: "⭐";
}

/* ===================================
   CALENDAR INTEGRATION STYLES
   =================================== */

.calendar-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs, 0.25rem);
    padding: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.calendar-button:hover {
    border-color: var(--brand-secondary);
    color: var(--brand-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.calendar-button::before {
    content: "📅";
    font-size: 1.2rem;
}

/* ===================================
   SHARE MODAL (Optional Enhancement)
   =================================== */

.modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn var(--transition-base);
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: var(--bg-primary);
    padding: var(--spacing-2xl, 3rem);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg, 1.25rem);
}

.modal-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-base);
}

.modal-close:hover {
    color: var(--danger);
}

.modal-body {
    margin-bottom: var(--spacing-lg, 1.25rem);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md, 1rem);
}

/* ===================================
   ADDITIONAL ENHANCEMENTS
   =================================== */

/* Smooth scroll behavior */
html {
    scroll-behavior: smooth;
}

/* Selection styling */
::selection {
    background: var(--primary-300);
    color: white;
}

::-moz-selection {
    background: var(--primary-300);
    color: white;
}

/* Prevent text selection on buttons */
button,
.tab-button,
.action-btn,
.calculate-btn {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Link styling in content */
.content-article a {
    color: var(--brand-primary);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-base);
}

.content-article a:hover {
    border-bottom-color: var(--brand-primary);
}

/* ===================================
   ANIMATIONS
   =================================== */

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.bounce {
    animation: bounce 1s infinite;
}

/* ===================================
   END OF STYLES
   =================================== */