:root {
    /* Updated Colors for Professional Look */
    --color-primary: #0f6fff; /* Soft Blue */
    --color-secondary: #f5f5f5; /* Light subtle background */
    --color-danger: #dc3545;
    --color-text: #333333; /* Darker text */
    --color-background: #ffffff;
    --color-light-grey: #f5f5f5; /* Used for secondary/subtle areas */
    --color-border: #e0e0e0; /* Lighter, cleaner border */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --spacing: 1.5rem; /* Increased general spacing */
    --border-radius: 0.75rem; /* 12px radius */
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.08); 
    --shadow-hover: 0 8px 20px rgba(0, 0, 0, 0.15); 
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    background-color: var(--color-light-grey);
    color: var(--color-text);
    line-height: 1.6;
}

#app-container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--color-background);
    min-height: 100vh;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.05); /* Lifts the whole app slightly */
}

header {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing) 2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
}

.title-block h1 {
    margin: 0;
    font-size: 1.75rem; /* Slightly larger title */
}

.title-block h1::first-letter {
    text-transform: uppercase;
}

.title-block .subtitle {
    margin: 0;
    font-size: 1rem;
    opacity: 0.9;
}

.settings {
    display: flex;
    gap: 0.5rem;
}

.settings button {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.1s;
}

.settings button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

.settings button.icon-button {
    padding: 0.4rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings button.icon-button .lucide-icon {
    width: 20px;
    height: 20px;
}

/* TTS toggle active state visual feedback */
.settings button#tts-toggle.active {
    background-color: rgba(255, 255, 255, 0.4);
}

/* Main Layout (Mobile First) */
main.quiz-layout {
    display: flex;
    flex-direction: column;
    padding: var(--spacing);
    max-width: 1000px;
    margin: 0 auto;
}

#quiz-area {
    padding: var(--spacing) 0;
}

#result-summary-placeholder {
    display: none; /* Hidden on mobile */
}

/* Progress */
#progress-container {
    margin-bottom: 2.5rem;
}

#progress-bar-shell {
    background: var(--color-border);
    height: 10px; /* Slightly thicker bar */
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

#progress-bar {
    height: 100%;
    background-color: var(--color-primary);
    transition: width 0.4s ease-out;
}

#step-counter {
    margin: 0;
    font-size: 1rem;
    color: var(--color-text); /* Use primary text color for clarity */
    font-weight: 600;
    text-align: right;
}

/* Question Cards & Controls */
.question-card {
    background: var(--color-background);
    padding: 2rem; /* More padding */
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-soft);
    margin-bottom: 2rem;
    position: relative;
    border: 1px solid var(--color-border); /* Subtle border for definition */
}

.question-card h2 {
    margin-top: 0;
    font-size: 1.5rem;
    color: var(--color-primary);
}

.question-card .question-text {
    font-size: 1.25rem; /* Larger font size for readability */
    margin-bottom: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: flex-start; /* Align text and button nicely */
    justify-content: space-between;
}

.question-text > p {
    margin: 0;
    padding-right: 1rem;
}

.question-text > button.tts-question-btn {
    flex-shrink: 0;
    background: var(--color-light-grey);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    width: 38px;
    height: 38px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
}

.question-text > button.tts-question-btn:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* Screen Transitions */
#screen-content {
    min-height: 250px; /* Prevent layout jump */
    position: relative;
    /* Base for screen transitions */
}
.screen-transition-area .question-card {
    animation: fadeInSlideIn 0.4s ease-out;
}

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


/* Buttons */
button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.2s ease-in-out;
    min-height: 52px; /* Tappable control target, slightly larger */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.primary {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 4px 10px rgba(15, 111, 255, 0.2); 
}
.primary:hover:not(:disabled) {
    background-color: #0056e6;
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 6px 15px rgba(15, 111, 255, 0.4);
}

.secondary {
    background-color: var(--color-light-grey);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}
.secondary:hover:not(:disabled) {
    background-color: #e0e0e0;
    border-color: #bbb;
    transform: translateY(-1px);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.navigation-controls {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* Input Styles */
.input-group {
    margin-bottom: 2rem;
}

/* Boolean (Yes/No) Buttons */
.boolean-input {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.boolean-input button {
    flex-grow: 1;
    max-width: 200px;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    background-color: var(--color-background);
    padding: 1rem 1.5rem; 
    font-size: 1.1rem;
}

.boolean-input button.selected {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(15, 111, 255, 0.3);
}

.boolean-input button.secondary {
    /* Ensure secondary buttons in boolean input look clean */
    background-color: var(--color-light-grey);
    border: 1px solid var(--color-border);
}

/* VAS Slider */
.vas-input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem 0;
}

.vas-value-display {
    font-size: 3rem; /* Even larger */
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 1rem;
    min-width: 60px;
    text-align: center;
    padding: 0.5rem 1rem;
    border: 2px solid var(--color-border); 
    border-radius: var(--border-radius);
    background-color: var(--color-light-grey);
}

input[type="range"] {
    width: 100%;
    height: 10px;
    -webkit-appearance: none;
    background: #ddd;
    border-radius: 5px;
    margin: 10px 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 30px; /* Bigger thumb for touch */
    height: 30px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: 4px solid white; /* Thicker border */
    box-shadow: 0 0 8px rgba(0,0,0,0.3);
}


.vas-scale-labels {
    display: flex;
    justify-content: space-between;
    width: 100%;
    font-size: 0.9rem;
    color: var(--color-text);
    font-weight: 400;
}

.microcopy {
    font-style: italic;
    font-size: 0.9rem;
    color: #666;
    text-align: center;
    margin-top: 1rem;
}

/* Result Screen Styling */
#result-container {
    padding: 0;
    margin-bottom: 0;
}

.result-title {
    font-size: 2rem;
    color: var(--color-primary);
    border-bottom: 3px solid var(--color-primary);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.result-subtitle-pain {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 1.5rem;
}

.advice-block {
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    border-left: 6px solid var(--color-primary); /* Thicker accent border */
    background-color: var(--color-light-grey); /* Light background for advice */
    box-shadow: var(--shadow-soft);
}

.advice-block.urgent {
    border-left: 6px solid var(--color-danger);
    background-color: #fff8f8; /* Very light red hint */
}

.advice-block h3 {
    color: var(--color-primary);
    margin-top: 0;
    font-size: 1.6rem; 
}

.advice-block.urgent h3 {
    color: var(--color-danger);
}

.warning-text {
    font-weight: bold;
    color: var(--color-danger);
    margin-top: 1rem;
}

.score-breakdown {
    margin-top: 2rem;
    border-top: 1px solid var(--color-border);
    padding-top: 1.5rem;
}

.score-breakdown h4 {
    color: var(--color-text);
    font-size: 1.2rem;
}

.score-breakdown p {
    margin: 0.5rem 0;
}

/* Specific styling for result controls */
.navigation-controls.result-controls {
    flex-direction: column;
    gap: 0.75rem;
}
.navigation-controls.result-controls button {
    width: 100%;
}


/* Footer & Disclaimer */
#footer {
    padding-bottom: var(--spacing);
    margin-top: var(--spacing);
}

.footer-disclaimer {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing);
}

.footer-disclaimer, .aside-disclaimer, .result-disclaimer-inner, .design-credit-line {
    font-size: 0.85rem;
    color: #666;
    text-align: center;
    padding: 0 var(--spacing);
}

.design-credit-line {
    font-size: 0.8rem;
    padding-top: 0.5rem;
    color: #999;
}

/* Responsive Tablet/Desktop (Two-column layout) */
@media (min-width: 768px) {
    main.quiz-layout {
        display: grid;
        grid-template-columns: 3fr 1.5fr; /* Adjusted ratio for better content display */
        gap: 2rem;
        padding: 2rem;
    }

    #quiz-area {
        padding: 0;
    }

    #result-summary-placeholder {
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding: 1.5rem;
        border-left: none; /* Remove vertical line */
        min-height: 400px;
        background-color: var(--color-light-grey);
        border-radius: var(--border-radius);
        box-shadow: var(--shadow-soft);
    }
    
    .aside-disclaimer {
        margin-top: auto; /* Push disclaimer to the bottom of the aside */
        padding: 0;
        border-top: 1px solid var(--color-border);
        width: 100%;
        padding-top: 1rem;
    }
    
    .boolean-input {
        justify-content: flex-start;
    }

    .boolean-input button {
        max-width: 160px;
    }
    
    .navigation-controls {
        grid-column: 1 / 2;
    }
    
    /* Result buttons layout on desktop */
    .navigation-controls.result-controls {
        flex-direction: row;
        flex-wrap: wrap; 
        gap: 1rem;
        justify-content: flex-start;
    }
    .navigation-controls.result-controls button {
        flex-grow: 0;
        min-width: unset;
        width: auto;
    }
}

/* Modal Styling */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Accessibility: High Contrast Mode */
body.high-contrast {
    --color-primary: #FFFF00;
    --color-secondary: #000000;
    --color-text: #000000;
    --color-background: #FFFFFF;
    --color-light-grey: #DDDDDD;
    --color-border: #000000;
    
    background-color: black;
    color: white;
}
body.high-contrast #app-container {
    background: black;
    border: 1px solid white;
    box-shadow: none;
}
body.high-contrast header {
    background-color: black;
    border-bottom: 2px solid var(--color-primary);
}
body.high-contrast .title-block h1,
body.high-contrast .title-block .subtitle {
    color: white;
}
body.high-contrast .settings button {
    background: #000;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}
body.high-contrast .settings button:hover {
    background: #000;
    border: 2px solid white;
}

body.high-contrast .question-card {
    background: #333;
    color: white;
    border: 2px solid white;
}

body.high-contrast .question-card h2 {
    color: var(--color-primary);
}

body.high-contrast .secondary {
    background-color: black;
    color: white;
    border: 2px solid white;
}
body.high-contrast .primary {
    background-color: var(--color-primary);
    color: black;
    box-shadow: none; 
}
body.high-contrast .primary:hover:not(:disabled) {
    background-color: var(--color-primary); 
    box-shadow: none;
    transform: none;
}
body.high-contrast input[type="range"] {
    background: white;
}
body.high-contrast input[type="range"]::-webkit-slider-thumb {
    background: var(--color-primary);
    border: 4px solid black;
    box-shadow: none;
}
body.high-contrast .boolean-input button {
    background-color: #333;
    border: 2px solid white;
    color: white;
}
body.high-contrast .boolean-input button.selected {
    background-color: var(--color-primary);
    color: black;
    border-color: var(--color-primary);
    box-shadow: none;
}
body.high-contrast .advice-block {
    background-color: #333;
    color: white;
    border-left: 5px solid var(--color-primary);
    box-shadow: none;
}
body.high-contrast .advice-block h3 {
    color: var(--color-primary);
}
body.high-contrast .advice-block.urgent {
    border-left: 5px solid #FF00FF; 
    background-color: #111;
}
body.high-contrast .advice-block.urgent h3 {
    color: #FF00FF;
}

body.high-contrast .tts-question-btn {
    background: #333 !important;
    border: 1px solid white !important;
    color: white !important;
}

body.high-contrast .footer-disclaimer, body.high-contrast .aside-disclaimer, body.high-contrast .result-disclaimer-inner, body.high-contrast .microcopy, body.high-contrast .vas-scale-labels, body.high-contrast .design-credit-line {
    color: white;
}
body.high-contrast .modal-content {
    background: black;
    color: white;
    border: 2px solid white;
}
body.high-contrast .warning-text {
    color: #FF00FF;
}
body.high-contrast .vas-value-display {
    border: 2px dashed white;
    background-color: #333;
}
body.high-contrast #progress-bar-shell {
    background: #444;
    border: 1px solid white;
}