:root {
    /* Color Palette */
    --color-primary: #4169E1;
    --color-primary-light: #87CEEB;
    --color-heuristic: #2F2F2F;
    --color-secondary: #FF9800;
    --color-secondary-dark: #F57C00;
    --color-success: #4CAF50;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-danger: #F44336;
    --color-danger-bg: #fff5f5;

    /* Feedback Colors */
    --color-feedback-success-bg: #e8f5e9;
    --color-feedback-success-text: #2e7d32;
    --color-feedback-error-bg: #ffebee;
    --color-feedback-error-text: #c62828;

    /* Scenario Colors */
    --color-scenario-1: #e8c27c;  /* Royal Blue */
    --color-scenario-2: #b8704b;  /* Sky Blue */
    --color-scenario-3: #6f3e2f;  /* Coral Red */
    --color-scenario-4: #E09743;  /* Teal */
    --color-scenario-5: #2f1b16;  /* Lime Green */
    --color-scenario-6: #BF4324;  /* Plum */
    --color-scenario-7: #A69B88;  /* Soft Yellow */
    --color-scenario-8: #A9C793;  /* Light Steel Blue */

    /* Text Colors */
    --color-text-primary: #333;
    --color-text-secondary: #666;
    --color-text-muted: #888;
    --color-text-light: #999;
    --color-text-lighter: #ccc;
    --color-text-error: #dc3545;
    --color-text-dark: #222;

    /* Background Colors */
    --color-bg-section: #f8f8f8;
    --color-bg-card: #f8f8f8;
    --color-bg-hover: #f0f0f0;
    --color-bg-white: #fff;

    /* Border Colors */
    --color-border: #ddd;
    --color-border-light: #eee;
    --color-border-medium: #cfcfcf;
    --color-border-dark: #bbb;

    /* Gradients */
    --gradient-primary: linear-gradient(to bottom, var(--color-primary), var(--color-border-medium));
    --color-gradient-end: #FAFAFA; /* End color from scenario card gradient */

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 20px;
    --spacing-xl: 30px;
    --spacing-2xl: 40px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Typography */
    --font-family: 'Mulish', system-ui, -apple-system, sans-serif;
    --font-size-sm: 0.85em;
    --font-size-base: 1em;
    --font-size-md: 1.1em;
    --font-size-lg: 1.3em;
    --font-size-xl: 2em;

    /* Transitions */
    --transition-fast: 0.2s ease;

    /* Shadows */
    --shadow-card: 0 2px 4px rgba(0, 0, 0, 0.1);

    /* Layout */
    --max-width: 1040px;
}

body {
    font-family: var(--font-family);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    background:
        linear-gradient(135deg,
            rgba(248, 249, 252, 1) 0%,
            rgba(215, 225, 243, 1) 50%,
            rgba(248, 249, 252, 1) 100%);
    background-attachment: fixed;
    color: var(--color-text-dark);
}

h1 {
    font-size: 2em;
    font-weight: 700;
    margin-bottom: 5px;
}

.subtitle {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xl);
}

h2 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
}

h2.section-heading {
    margin-top: var(--spacing-xl);
}

p {
    margin: 0;
    color: var(--color-text-primary);
    font-size: var(--font-size-md);
    line-height: 1.4;
}

body > p {
    margin-bottom: var(--spacing-2xl);
}

/* ============================================
 * Utility Classes - Spacing
 * ============================================ */

/* Vertical list spacing */
.v-stack {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.v-stack-sm {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* ============================================
 * Homepage Styles
 * ============================================ */

.hero {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    margin-bottom: var(--spacing-lg);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
    letter-spacing: -0.5px;
}

.title-tilt {
    display: inline-block;
    transform: rotate(15deg) scale(0.75) translateY(-0.1em);
    transform-origin: bottom center;
    margin-left: -0.24em;
    margin-right: 0.06em;
    font-weight: 700;
}

.title-measure {
    font-weight: 900;
    position: relative;
}

.title-measure::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 2px;
    right: 1px;
    height: 8px;
    background: repeating-linear-gradient(
        90deg,
        var(--color-text-light) 0px,
        var(--color-text-light) 2px,
        transparent 2px,
        transparent 10px
    );
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.5px;
}

/* Mini hero for subpages */
.hero-mini {
    margin-bottom: var(--spacing-xl);
}

.hero-mini a {
    text-decoration: none;
    color: inherit;
}

.hero-mini a:hover {
    color: var(--color-primary);
}


.hero-mini h1 {
    font-size: 1.44rem;
    font-weight: 400;
    letter-spacing: -0.5px;
    margin: 0;
    opacity: 0.5;
}

.hero-mini a:hover h1 {
    opacity: 1;
}

.hero-mini .title-measure::after {
    right: -5px;
    height: 5px;
    background: repeating-linear-gradient(
        90deg,
        var(--color-text-light) 0px,
        var(--color-text-light) 1px,
        transparent 1px,
        transparent 6px
    );
}

/* Tile badges */
.tile-content {
    position: relative;
}

.tile-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
    display: inline-block;
    z-index: 1;
}

/* "Tool" is ~50px wide + 10px gap = 60px, round to 70px for safety */
.tile-badge-tool + .tile-badge-soon {
    left: 70px;
}

/* "Learn" is ~58px wide + 10px gap = 68px, round to 78px for safety */
.tile-badge-learn + .tile-badge-soon {
    left: 78px;
}

.tile-badge-tool {
    background: #4169E1;
    color: white;
}

.tile-badge-learn {
    background: #10B981;
    color: white;
}

.tile-badge-soon {
    background: #9CA3AF;
    color: white;
}

.tile-badge-heuristics {
    background: var(--color-heuristic);
    color: white;
}

/* Coming soon tiles */
.tile-coming-soon {
    opacity: 0.6;
    cursor: default;
}

.tile-coming-soon:hover {
    transform: none;
    box-shadow: none;
}

.tile-coming-soon .tile-image {
    height: 50px;
    background: var(--color-bg-section);
}

/* Basic layout for tiles grid */
.tiles-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

/* Tile styling */
.tile {
    background: var(--gradient-primary);
    padding: 10px;
    border-radius: var(--radius-lg);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.tile:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(65, 105, 225, 0.2);
}

.tile-content {
    border-radius: 8px;
    overflow: visible;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.tile-image {
    background: var(--color-bg-white);
    text-align: center;
    margin-bottom: 1px;
    width: 100%;
    height: auto;
    border-radius: 8px 8px 0 0;
}

.tile-text {
    background: var(--color-bg-section);
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
    border-radius: 0 0 8px 8px;
}

.tile h2 {
    margin: 0 0 var(--spacing-sm) 0;
}

.tile p {
    margin: 0;
    flex: 1;
}

/* Make tile work as a link */
a.tile {
    text-decoration: none;
    color: inherit;
    display: flex;
}

/* Breadcrumb navigation */
.breadcrumb {
    margin-bottom: var(--spacing-lg);
}

.breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Simulation page layout */
.simulation-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.explanation-section,
.interactive-section,
.interpretation-section {
    background: var(--color-bg-section);
    padding: 25px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
}

.explanation-section ul,
.interpretation-section ul {
    line-height: 1.7;
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.input-field {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.input-field label {
    font-weight: 600;
    font-size: 0.95em;
}

.input-field input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
}

.input-field input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #4169E1;
    cursor: pointer;
}

.input-field input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #4169E1;
    cursor: pointer;
    border: none;
}

.number-input {
    width: 80px;
    padding: 6px 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.95em;
    font-family: var(--font-family);
    transition: border-color 0.2s ease;
}

.number-input:hover {
    border-color: #bbb;
}

.number-input:focus {
    outline: none;
    border-color: #4169E1;
    box-shadow: 0 0 0 3px rgba(65, 105, 225, 0.1);
}

/* Hide number input spinners */
.number-input::-webkit-outer-spin-button,
.number-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.number-input[type=number] {
    -moz-appearance: textfield;
}

/* Inherited value styling - lower opacity for inherited values */
.number-input.inherited-value {
    opacity: 0.6;
    font-style: italic;
}

.number-input.inherited-value:hover {
    opacity: 0.75;
}

.number-input.inherited-value:focus {
    opacity: 1;
    font-style: normal;
}

/* Incomplete value styling - orange border for required fields */
.number-input.incomplete-value {
    border-color: #FF9800;
    border-width: 2px;
    box-sizing: border-box;
}

.number-input.incomplete-value:hover {
    border-color: #F57C00;
}

.number-input.incomplete-value:focus {
    border-color: #FF9800;
    box-shadow: 0 0 0 3px rgba(255, 152, 0, 0.1);
}

/* Button */
.primary-button {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: var(--spacing-md) 24px;
    border-radius: 6px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.primary-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(65, 105, 225, 0.3);
}

.primary-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

@media (max-width: 1050px) {
    .primary-button {
        padding: var(--spacing-sm) 8px;
        font-size: 0.9em;
    }
}

@media (max-width: 600px) {
    .primary-button {
        padding: var(--spacing-xs) 6px;
        font-size: 0.85em;
    }
}

/* Results section */
.results-section {
    margin-top: var(--spacing-xl);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.result-card {
    background: var(--color-bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-card);
}

.result-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.result-value {
    font-size: 2em;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.result-description {
    font-size: 0.8em;
    color: var(--color-text-muted);
    line-height: 1.4;
}

/* Visualization */
.visualization {
    background: var(--color-bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: center;
}

#resultsChart {
    max-width: 100%;
    height: auto;
}

/* Scenarios section */
.scenarios-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.scenarios-header h2 {
    flex-shrink: 0;
}

@media (max-width: 1000px) {
    .scenarios-header h2 {
        display: none;
    }

    .scenarios-header {
        justify-content: stretch;
    }

    .header-controls {
        flex: 1;
        justify-content: space-between;
    }
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) 16px;
    box-shadow: var(--shadow-card);
}

.header-controls-lesson {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
}

.power-target-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.power-target-control label {
    font-size: 0.9em;
    font-weight: 500;
    color: #333;
}

.power-input-narrow {
    width: 60px;
}

.power-input-smaller {
    width: 50px;
    padding: 4px 6px;
    font-size: 0.9em;
}

.power-mode-selector {
    display: flex;
    gap: 15px;
    align-items: center;
}

.power-mode-selector label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9em;
}

.power-mode-selector input[type="radio"] {
    margin: 0;
    vertical-align: middle;
}

.secondary-button {
    background: white;
    color: #4169E1;
    border: 2px solid #4169E1;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.9em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.secondary-button:hover {
    background: #4169E1;
    color: white;
}

#scenariosList {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.scenario-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    padding: 10px var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-fast);
    position: relative;
}

/* Mini summary - appears to the right of card on wide screens */
.scenario-mini-summary {
    display: none;
    position: absolute;
    right: -180px;
    top: 10px;
    width: 160px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding: 8px 0;
}

.scenario-mini-summary .mini-summary-duration {
    font-size: 0.95rem;
    color: var(--color-text-dark);
    margin-bottom: 4px;
}

.scenario-mini-summary .mini-summary-duration strong {
    font-weight: 700;
}

.scenario-mini-summary .mini-summary-secondary {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.scenario-mini-summary .mini-summary-users {
    font-size: 0.8rem;
    margin-bottom: 4px;
}

.scenario-mini-summary .mini-summary-power {
    font-weight: 600;
}

.scenario-mini-summary .mini-summary-power.power-good {
    color: var(--color-success);
}

.scenario-mini-summary .mini-summary-power.power-medium {
    color: var(--color-warning);
}

.scenario-mini-summary .mini-summary-power.power-low {
    color: var(--color-error);
}

/* Show mini summary on wide screens with enough space */
@media (min-width: 1100px) {
    .scenario-mini-summary {
        display: block;
    }
}

.scenario-header-wrapper {
    width: 100%;
    border-bottom: 1px solid var(--color-border-medium);
    margin-bottom: 15px;
}

.scenario-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: var(--spacing-md);
}

.scenario-name-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: 6px;
}

.scenario-name-group input {
    background-color: transparent;
}

.scenario-name-input {
    font-size: var(--font-size-md);
    font-weight: 600;
    border: 1px solid transparent;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    flex: 1 1 auto;
    min-width: 200px;
    max-width: 400px;
    margin-left: calc(-1 * var(--spacing-sm));
    width: 100%;
}

.scenario-name-input:hover {
    border-color: var(--color-primary);
}

.scenario-name-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.todo-badge {
    background: #FF9800;
    color: white;
    font-size: 0.7em;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-left: -3px;
}

.reco-badge {
    background: #000;
    color: white;
    font-size: 0.7em;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-left: -3px;
}

/* Scenario menu */
.scenario-menu {
    position: relative;
    margin-bottom: 6px;
}

.menu-button {
    background: transparent;
    color: #999;
    border: none;
    width: 24px;
    height: 24px;
    font-size: 1.2em;
    line-height: 1;
    cursor: pointer;
    transition: all 0.2s ease;
    border-radius: 4px;
    padding: 0;
}

.menu-button:hover {
    background: #f0f0f0;
    color: #333;
}

.menu-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 4px;
    background: white;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    min-width: 200px;
    z-index: 100;
    overflow: hidden;
}

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

.menu-dropdown button {
    display: block;
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: white;
    text-align: left;
    cursor: pointer;
    font-size: 0.9em;
    font-family: var(--font-family);
    color: #333;
    transition: background 0.2s ease;
}

.menu-dropdown button:hover {
    background: #f8f9fa;
}

.menu-dropdown button:last-child {
    color: var(--color-text-error);
}

.menu-dropdown button:last-child:hover {
    background: var(--color-danger-bg);
}

.metric-type-tabs {
    display: flex;
    gap: var(--spacing-sm);
    position: relative;
    margin-left: auto;
}

.metric-type-tabs label {
    cursor: pointer;
    padding: 6px var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
    transition: all var(--transition-fast);
    white-space: nowrap;
    position: relative;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    background: transparent;
    border: 1px solid transparent;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
}

.metric-type-tabs label:not(.active):hover {
    text-decoration: underline;
}

.metric-type-tabs label.active {
    color: var(--color-text-primary);
    border-color: var(--color-border-medium);
    border-bottom: 2px solid var(--color-gradient-end);
}

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

/* Traffic controls wrapper */
.traffic-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.traffic-controls .number-input {
    flex: 0 0 auto;
}

/* Traffic period selector */
.traffic-period-selector {
    display: flex;
    gap: 15px;
    margin: 0;
}

.traffic-period-selector label {
    display: flex;
    align-items: center;
    gap: 3px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9em;
}

.traffic-period-selector input[type="radio"] {
    cursor: pointer;
    margin: 0;
    vertical-align: middle;
}


.scenario-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-grid {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.input-grid .input-field {
    flex: 1;
    min-width: 180px;
}

.input-grid .input-field-tight {
    flex: 0 0 auto;
    min-width: auto;
}

.input-field-tight + .input-field-tight {
    margin-left: -7px;
}

.input-grid .input-field-narrow {
    flex: 0 0 calc(18% - 11.25px);
    min-width: 120px;
}

.input-grid .input-field-wide {
    flex: 2;
    min-width: 300px;
}

.input-grid .input-field-wide.test-type-group {
    margin-left: auto;
    flex: 0 0 auto;
    min-width: 220px;
}

.input-grid .input-field-narrow.power-override-group {
    margin-left: auto;
}

.scenario-controls .input-field small {
    display: block;
    margin-top: -4px;
    color: #666;
    font-size: 0.85em;
}

/* Results section - reusable padded container */
.results-section {
    background: var(--color-bg-section);
    padding: 25px;
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-card);
}

/* Comparison results - extends results-section */
.comparison-results {
    background: var(--color-bg-section);
    padding: 25px;
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-card);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.comparison-table th {
    background: white;
    color: #000;
    padding: 12px;
    text-align: left;
    font-weight: 700;
    border-bottom: 2px solid #e0e0e0;
    user-select: none;
}

.comparison-table th[data-sort]:hover {
    background: #f8f9fa;
}

.comparison-table td {
    padding: 12px;
    border-bottom: 1px solid #eee;
    font-size: 0.9rem;
}

.comparison-table td:first-child {
    font-size: 1rem;
}

.comparison-table td:first-child strong {
    font-weight: 400;
}

.comparison-table tbody tr:last-child td {
    border-bottom: none;
}

.power-good {
    color: #4CAF50;
    font-weight: 700;
}

.power-medium {
    color: #FF9800;
    font-weight: 700;
}

.power-low {
    color: #F44336;
    font-weight: 700;
}

#comparisonChart {
    max-width: 100%;
    height: auto;
}

/* Duration chart */
.duration-chart {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-card);
    overflow-x: auto;
}

.duration-chart svg {
    display: block;
    margin: 0 auto;
}

/* Feedback messages - for form validation, quiz answers, etc. */
.feedback {
    font-weight: 600;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
}

.feedback.correct,
.feedback.success {
    background: var(--color-feedback-success-bg);
    color: var(--color-feedback-success-text);
}

.feedback.incorrect,
.feedback.error {
    background: var(--color-feedback-error-bg);
    color: var(--color-feedback-error-text);
}

/* Progress bar */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--color-secondary);
    transition: width 0.3s ease;
}

/* Range slider - consistent styling */
.range-slider {
    flex: 1;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--color-border);
    border-radius: var(--radius-sm);
    outline: none;
}

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

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

/* ============================================
 * Lessons
 * Styles for interactive lesson pages
 * ============================================ */

/* Lesson question - bold prompt for quiz/exercise questions */
.lesson-question {
    /* font-weight: 600; */
}

/* Stat-sig badge - inline green badge for stat-sig mentions */
.stat-sig-badge {
    display: inline-block;
    background: var(--color-success);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.85em;
    font-weight: 700;
    padding: 2px 8px;
    vertical-align: baseline;
}

/* Inline Feedback Component - shows underneath controls */
.inline-feedback {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.95em;
    line-height: 1.4;
}

.inline-feedback.feedback-correct {
    background: var(--color-feedback-success-bg);
    border: 1px solid var(--color-success);
    color: var(--color-feedback-success-text);
}

.inline-feedback.feedback-incorrect {
    background: var(--color-feedback-error-bg);
    border: 1px solid var(--color-error);
    color: var(--color-feedback-error-text);
}

.inline-feedback-icon {
    font-size: 1.2em;
    font-weight: bold;
    flex-shrink: 0;
}

.inline-feedback-message {
    flex: 1;
}

/* ============================================
 * Heuristic Cards
 * Dark cards displaying expert heuristics
 * ============================================ */

.heuristics-section {
    margin: var(--spacing-2xl) 0;
}

.heuristics-section h2 {
    margin-bottom: var(--spacing-lg);
}

.heuristics-row {
    display: flex;
    gap: var(--spacing-lg);
}

.heuristic-card {
    background: var(--color-heuristic);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    position: relative;
    transition: all 0.3s ease;
}

.heuristic-card-expanded {
    grid-column: span 2;
    box-shadow: 0 0 0 5px rgba(65, 105, 225, 1),
                0 0 40px rgba(65, 105, 225, 0.8),
                0 0 80px rgba(65, 105, 225, 0.5);
    transform: scale(1.02);
    z-index: 10;
}

.heuristic-card-link {
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.heuristic-card-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.heuristic-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #888;
}

.heuristic-label span {
    color: #aaa;
}

.heuristic-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: white;
    line-height: 1.3;
    margin: 0;
}

.heuristic-conditional {
    font-size: 0.85rem;
    color: #F59E0B;
    font-style: italic;
}

.heuristic-numerical-summary {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    font-size: 0.75rem;
    color: #888;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: rgba(136, 136, 136, 0.15);
    padding: 3px 8px;
    border-radius: 4px;
    display: inline-block;
    line-height: 1;
}

.heuristic-numerical-summary-inline {
    background: rgba(136, 136, 136, 0.15);
    color: #888;
    padding: 4px 8px;
    border-radius: 8px;
    margin-right: 8px;
    font-weight: 600;
    display: inline-block;
    line-height: 1;
}

.heuristic-description {
    font-size: 0.9rem;
    color: #ccc;
    line-height: 1.5;
    font-style: italic;
}

.heuristic-description::before {
    content: '"';
}

.heuristic-description::after {
    content: '"';
}

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

.heuristic-author-image {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.heuristic-author-name {
    font-size: 0.85rem;
    color: #aaa;
    font-weight: 500;
}

.heuristic-sources {
    font-size: 0.75rem;
    color: #888;
    border-top: 1px solid #444;
    padding-top: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.heuristic-sources-label {
    font-weight: 600;
    margin-bottom: 4px;
}

.heuristic-sources ul {
    margin: 0;
    padding-left: var(--spacing-md);
}

.heuristic-sources li {
    margin-bottom: 2px;
}

.heuristic-sources a {
    color: #6B9FFF;
    text-decoration: none;
}

.heuristic-sources a:hover {
    text-decoration: underline;
}

/* ============================================
 * Heuristics Page
 * Filter controls, grid layout, section links
 * ============================================ */

.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
}

.back-link {
    display: inline-block;
    color: #6B9FFF;
    text-decoration: none;
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
}

.back-link:hover {
    text-decoration: underline;
}

.section-link {
    text-decoration: none;
    color: inherit;
}

.section-link:hover h2 {
    color: #6B9FFF;
}

.heuristics-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-pills {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-pill {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--color-text-muted);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-light);
    cursor: pointer;
    font-size: 0.85rem;
    font-family: inherit;
    font-weight: 700;
    transition: all var(--transition-fast);
}

.filter-pill:hover {
    border-color: var(--color-text-secondary);
    color: var(--color-primary);
}

.filter-pill.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.author-pills {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.author-pill {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-text-muted);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-light);
    cursor: pointer;
    font-size: 0.85rem;
    font-family: inherit;
    font-weight: 700;
    transition: all var(--transition-fast);
}

.author-pill:hover {
    border-color: var(--color-text-secondary);
    color: var(--color-primary);
}

.author-pill.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.author-pill-image {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    object-fit: cover;
}

.heuristics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    grid-auto-flow: dense;
}

/* On medium screens, use 2 columns */
@media (min-width: 768px) {
    .heuristics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* On larger screens, use 3 columns for better expansion behavior */
@media (min-width: 1200px) {
    .heuristics-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Expanded cards span 2 columns in 3-column layout */
    .heuristic-card-expanded {
        grid-column: span 2;
    }
}

.no-results {
    color: #888;
    font-style: italic;
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-xl);
}

/* ============================================
 * Inline Heuristics (for embedding in pages)
 * Simple one-liner display format
 * ============================================ */

.heuristics-inline {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: #2a2a2a;
    border-radius: var(--radius-lg);
    border-left: 3px solid #6B9FFF;
}

.heuristics-inline h3 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 0.9rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.heuristics-inline-list li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid #333;
    font-size: 0.95rem;
    line-height: 1.5;
}

.heuristics-inline-list li:last-child {
    border-bottom: none;
}

.heuristics-inline-list strong {
    color: white;
}

.heuristic-inline-numerical {
    color: #6B9FFF;
    font-weight: 600;
    background: rgba(107, 159, 255, 0.15);
    padding: 2px 8px;
    border-radius: 4px;
    margin-right: var(--spacing-sm);
    font-size: 0.85em;
}

.heuristic-inline-conditional {
    color: #F59E0B;
    font-style: italic;
    margin-left: var(--spacing-sm);
}

.heuristic-inline-conditional::before {
    content: '— ';
}

.heuristic-inline-author {
    color: #666;
    font-size: 0.85rem;
    margin-left: var(--spacing-sm);
}

.heuristics-inline-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    color: #6B9FFF;
    text-decoration: none;
    font-size: 0.85rem;
}

.heuristics-inline-link:hover {
    text-decoration: underline;
}

/* Site Footer */
.site-footer {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    text-align: center;
    border-top: none;
}

.site-footer::before {
    content: '';
    display: block;
    width: 400px;
    height: 1px;
    background-color: var(--color-border-dark);
    margin: 0 auto var(--spacing-lg);
}

.site-footer p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: 0;
}

.site-footer a {
    color: var(--color-text-secondary);
    text-decoration: none;
}

.site-footer a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--color-text-dark);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}