/* ===================================
   Running Time Chart - Styles
   Mobile-first responsive design
   =================================== */

/* CSS Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --error-color: #dc2626;
    --error-bg: #fee2e2;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #d1d5db;
    --border-focus: #2563eb;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

/* Container - Mobile First (320px+) */
.container {
    width: 100%;
    max-width: 100%;
    padding: var(--spacing-md);
    margin: 0 auto;
}

/* Header */
header {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
}

.header-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.title-section {
    text-align: center;
    flex: 1;
}

header h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Language Selector */
.language-selector-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.language-selector {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.language-selector:hover {
    border-color: var(--primary-color);
}

.language-selector:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

/* Input Section */
.input-section {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Profile Group */
.profile-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.profile-label {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    display: block;
}

.profile-toggle {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.profile-option {
    flex: 1;
    min-width: 120px;
    position: relative;
    cursor: pointer;
}

.profile-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.profile-option-label {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    transition: all 0.2s ease;
    user-select: none;
}

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

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

.profile-option input[type="radio"]:focus + .profile-option-label {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

.profile-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
    margin-top: var(--spacing-xs);
}

/* Manual Percentages Section */
.manual-percentages-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.manual-percentages-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.manual-percentages-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.manual-percentage-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

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

.percentage-inputs {
    display: flex;
    gap: var(--spacing-sm);
}

.percentage-input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.manual-percentage-input {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    padding-right: 3rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    transition: border-color 0.2s ease;
}

.manual-percentage-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.manual-percentage-input:hover:not(:focus) {
    border-color: var(--text-secondary);
}

.percentage-unit {
    position: absolute;
    right: 2.5rem;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    pointer-events: none;
    font-weight: 500;
}

.percentage-label {
    position: absolute;
    right: var(--spacing-xs);
    font-size: 0.7rem;
    color: var(--text-secondary);
    pointer-events: none;
    font-weight: 600;
    text-transform: uppercase;
}

/* Responsive - Tablet */
@media (min-width: 640px) {
    .manual-percentages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Responsive - Desktop */
@media (min-width: 1024px) {
    .manual-percentages-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.mas-helper-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
    margin-top: var(--spacing-xs);
    line-height: 1.5;
    margin-bottom: var(--spacing-lg);
}

.input-group:last-child {
    margin-bottom: 0;
}

.pace-range-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.pace-range-group label {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    display: block;
}

.pace-range-inputs {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.pace-range-inputs .input-wrapper {
    flex: 1;
    min-width: 100px;
}

.pace-range-inputs .input-wrapper input {
    padding-right: var(--spacing-md);
}

.range-separator {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    font-weight: 500;
}

.input-label-small {
    position: absolute;
    right: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    pointer-events: none;
    font-weight: 500;
}

.input-group label {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    display: block;
}

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

.input-wrapper input {
    flex: 1;
    font-size: var(--font-size-base);
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 4rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    width: 100%;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input-wrapper input:hover:not(:focus) {
    border-color: var(--text-secondary);
}

.input-wrapper input.error {
    border-color: var(--error-color);
}

.input-wrapper input.error:focus {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.input-unit {
    position: absolute;
    right: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    pointer-events: none;
    font-weight: 500;
}

/* Error Message */
.error-message {
    font-size: var(--font-size-sm);
    color: var(--error-color);
    min-height: 1.25rem;
    display: block;
}

.error-message:empty {
    display: none;
}

/* Table Section */
.table-section {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.table-section h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* Table Container - Horizontal Scroll on Mobile */
.table-container {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 auto;
}

/* Pace Table Styles */
.pace-table {
    width: 100%;
    min-width: 600px;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
    background-color: var(--bg-primary);
    table-layout: fixed;
}

.pace-table col.pace-col {
    width: 70px;
}

.pace-table col.speed-col {
    width: 60px;
}

.pace-table col.distance-col {
    width: auto;
}

.pace-table thead {
    background-color: var(--bg-secondary);
    position: sticky;
    top: 0;
    z-index: 10;
}

.pace-table th {
    padding: 0.25rem var(--spacing-xs);
    text-align: center;
    font-weight: 600;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.pace-table th.corner-cell {
    background-color: var(--bg-secondary);
    font-weight: 700;
}

.pace-table th.pace-header {
    text-align: right;
    padding-right: var(--spacing-md);
    background-color: var(--bg-secondary);
    font-weight: 600;
    white-space: nowrap;
}

.pace-table th.distance-header {
    text-align: center;
}

.pace-table .distance-name {
    display: block;
    font-weight: 700;
    font-size: var(--font-size-base);
}

.pace-table .intensity-zone {
    display: block;
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 0.15rem;
}

.pace-table td {
    padding: 0.25rem var(--spacing-xs);
    text-align: center;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: background-color 0.3s ease;
}

.pace-table td.time-cell {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
}

.pace-table td.speed-cell {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    text-align: center;
    color: var(--text-secondary);
    font-weight: 500;
}

/* MAS Highlighting Colors - WCAG AA Compliant (4.5:1 contrast ratio) */
.pace-table td.highlight-green {
    background-color: #047857;
    color: #ffffff;
    font-weight: 600;
}

.pace-table td.highlight-orange {
    background-color: #c2410c;
    color: #ffffff;
    font-weight: 600;
}

.pace-table td.highlight-red {
    background-color: #dc2626;
    color: #ffffff;
    font-weight: 600;
}

/* Hover Effects */
.pace-table tbody tr:hover td {
    background-color: rgba(37, 99, 235, 0.05);
}

.pace-table tbody tr:hover td.highlight-green,
.pace-table tbody tr:hover td.highlight-orange,
.pace-table tbody tr:hover td.highlight-red {
    filter: brightness(1.1);
}

/* References Section */
.references-section {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.references-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.references-intro {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.references-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.reference-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: var(--spacing-sm);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary-color);
}

.reference-item strong {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    font-weight: 600;
}

.reference-item .mas-range {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 600;
}

.reference-item .zone-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
}

.references-note {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    line-height: 1.6;
}

.references-sources {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

.references-sources strong {
    color: var(--text-primary);
}

/* Accessibility - Focus Visible */
input:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
    
    .input-wrapper input {
        border-width: 3px;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================================
   Tablet Styles (768px+)
   =================================== */
@media (min-width: 768px) {
    .container {
        padding: var(--spacing-xl);
    }
    
    header h1 {
        font-size: var(--font-size-2xl);
    }
    
    .subtitle {
        font-size: var(--font-size-base);
    }
    
    .input-section {
        padding: var(--spacing-xl);
    }
    
    .pace-table {
        font-size: var(--font-size-base);
    }
    
    .pace-table th,
    .pace-table td {
        padding: 0.35rem var(--spacing-md);
    }
    
    .references-section {
        padding: var(--spacing-xl);
    }
    
    .references-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===================================
   Desktop Styles (1024px+)
   =================================== */
@media (min-width: 1024px) {
    .container {
        max-width: 1200px;
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    header {
        padding: var(--spacing-xl) 0;
    }
    
    .input-section {
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .table-section {
        padding: var(--spacing-xl);
    }
    
    .table-container {
        max-width: 1200px;
    }
    
    .pace-table {
        min-width: 800px;
    }
    
    .input-wrapper input {
        font-size: var(--font-size-lg);
        padding: var(--spacing-md) var(--spacing-lg);
        padding-right: 5rem;
    }
    
    .input-unit {
        right: var(--spacing-lg);
        font-size: var(--font-size-base);
    }
    
    .references-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    body {
        background-color: white;
    }
    
    .input-section {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
    
    .table-section {
        box-shadow: none;
        border: 1px solid var(--border-color);
        page-break-inside: avoid;
    }
    
    .pace-table {
        page-break-inside: avoid;
    }
}

/* Input Controls */
.input-controls {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
}

.input-controls .input-wrapper {
    flex: 1;
}

.clear-button {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    height: 42px;
}

.clear-button:hover {
    background-color: var(--border-color);
}

.clear-button:active {
    transform: translateY(1px);
}

/* Legend */
.legend {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.legend h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.legend-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.legend-color {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.legend-color.intensity-lower {
    background-color: #047857;
}

.legend-color.intensity-middle {
    background-color: #c2410c;
}

.legend-color.intensity-higher {
    background-color: #dc2626;
}

.legend-item span {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Responsive Design - Tablet (768px+) */
@media (min-width: 768px) {
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
    }

    .title-section {
        text-align: left;
    }

    .subtitle {
        margin: 0;
    }

    .legend-items {
        flex-direction: row;
        flex-wrap: wrap;
    }

    header h1 {
        font-size: var(--font-size-2xl);
    }
}

/* Responsive Design - Desktop (1024px+) */
@media (min-width: 1024px) {
    .container {
        max-width: 1200px;
    }
}

/* References Section */
.references-section {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.references-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.references-intro {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.references-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.reference-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary-color);
}

.reference-item strong {
    font-size: var(--font-size-base);
    color: var(--text-primary);
}

.mas-range {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 600;
}

.zone-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
}

.references-note,
.references-sources {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-top: var(--spacing-md);
}

.references-note strong,
.references-sources strong {
    color: var(--text-primary);
}

/* Responsive - Tablet */
@media (min-width: 640px) {
    .references-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Responsive - Desktop */
@media (min-width: 1024px) {
    .references-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Interval Training Section */
.interval-section {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    display: none; /* Hidden by default, shown when MAS is entered */
}

.interval-header {
    margin-bottom: var(--spacing-lg);
}

.interval-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.interval-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Interval Grid */
.interval-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

/* Interval Card */
.interval-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border-left: 4px solid var(--primary-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.interval-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.interval-card[data-zone="vo2max"] {
    border-left-color: #ef4444; /* Red for VO2max */
}

.interval-card[data-zone="anaerobic"] {
    border-left-color: #dc2626; /* Darker red for anaerobic */
}

.interval-card[data-zone="threshold"] {
    border-left-color: #f59e0b; /* Orange for threshold */
}

.interval-card[data-zone="tempo"] {
    border-left-color: #10b981; /* Green for tempo */
}

/* Card Header */
.interval-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.interval-card-header h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.interval-zone-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.interval-card[data-zone="vo2max"] .interval-zone-badge {
    background-color: #ef4444;
}

.interval-card[data-zone="anaerobic"] .interval-zone-badge {
    background-color: #dc2626;
}

.interval-card[data-zone="threshold"] .interval-zone-badge {
    background-color: #f59e0b;
}

.interval-card[data-zone="tempo"] .interval-zone-badge {
    background-color: #10b981;
}

/* Card Body */
.interval-card-body {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.interval-detail {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xs) 0;
}

.interval-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.interval-value {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    font-weight: 600;
    text-align: right;
}

.interval-value.primary {
    font-size: var(--font-size-base);
    color: var(--primary-color);
    font-weight: 700;
}

/* Card Footer */
.interval-card-footer {
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
}

.interval-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: var(--spacing-xs);
    font-style: italic;
}

.interval-mas-range {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Interval Notes */
.interval-notes {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    border-left: 3px solid var(--primary-color);
}

.interval-notes p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.interval-notes p:last-child {
    margin-bottom: 0;
}

.interval-sources {
    font-size: 0.75rem !important;
    margin-top: var(--spacing-sm);
}

/* Responsive - Tablet */
@media (min-width: 640px) {
    .interval-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Responsive - Desktop */
@media (min-width: 1024px) {
    .interval-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Responsive - Large Desktop */
@media (min-width: 1280px) {
    .interval-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}