/* Professional Hearing Test Styles - Matching Examples */
:root {
    /* Color Palette */
    --primary-blue: #4F46E5;
    --primary-blue-light: #6366F1;
    --primary-blue-dark: #3730A3;
    --secondary-purple: #7C3AED;
    
    /* Neutral Colors */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Text Colors */
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    
    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-accent: #F3F4F6;
    
    /* Shadows and Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.025em;
}

/* Header Styles */
header {
    background-color: var(--bg-primary);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--gray-200);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo-container h1 {
    font-size: 1.5rem;
    color: var(--primary-blue);
    font-weight: 700;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition-fast);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
}

.nav-link:hover {
    color: var(--primary-blue);
    background-color: var(--gray-50);
}

/* Main Container - CENTERED LAYOUT */
.main-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Test Sections */
.test-section {
    display: none;
    width: 100%;
}

.test-section.active {
    display: block;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* Test Card - CENTERED CARD LAYOUT */
.test-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    max-width: 900px;
    margin: 0 auto;
    border: 1px solid var(--gray-200);
}

/* Progress Steps */
.progress-steps {
    display: flex;
    justify-content: center;
    gap: 3rem;
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--gray-200);
}

.step {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    position: relative;
    padding-bottom: 0.5rem;
}

.step.active {
    color: var(--text-primary);
}

.step.completed {
    color: var(--primary-blue);
}

.step::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--gray-200);
    border-radius: 1px;
}

.step.active::after {
    background-color: var(--text-primary);
}

.step.completed::after {
    background-color: var(--primary-blue);
}

/* Card Content - LEFT IMAGE, RIGHT CONTENT */
.card-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 500px;
}

.image-section {
    position: relative;
    overflow: hidden;
    background: var(--gray-100);
}

.image-section img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.validation-badge {
    position: absolute;
    bottom: 1.5rem;
    left: 1.5rem;
    background: rgba(15, 23, 42, 0.8);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
}

.content-section {
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Typography */
.content-section h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.1;
}

.content-section h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-weight: 400;
}

.highlight {
    color: var(--secondary-purple);
    font-weight: 600;
}

/* Start Button */
.start-button-container {
    margin: 2rem 0;
    display: flex;
    justify-content: center;
}

.start-button {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, 
        rgba(255, 182, 193, 0.3) 0%,
        rgba(186, 164, 255, 0.3) 35%,
        rgba(79, 70, 229, 0.8) 100%);
    border: none;
    cursor: pointer;
    position: relative;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.start-button:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
}

.start-button .button-text {
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

/* Expandable Section */
.expandable-section {
    margin-top: 1.5rem;
}

.expand-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: var(--primary-blue);
    font-size: 0.875rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--transition-fast);
    width: 100%;
}

.expand-toggle:hover {
    color: var(--primary-blue-dark);
}

.chevron {
    transition: var(--transition-fast);
}

.expand-toggle.active .chevron {
    transform: rotate(180deg);
}

.expand-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
    padding: 0 1rem;
}

.expand-content.active {
    max-height: 200px;
    padding: 1rem;
}

.expand-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Choice Buttons */
.choice-buttons {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.choice-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-xl);
    background: var(--bg-primary);
    cursor: pointer;
    transition: var(--transition-normal);
    min-width: 100px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.choice-btn:hover {
    border-color: var(--primary-blue);
    background: var(--gray-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.choice-btn.selected {
    border-color: var(--primary-blue);
    background: var(--primary-blue);
    color: white;
}

.choice-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.choice-btn.selected .choice-icon {
    background: white;
    color: var(--primary-blue);
}

/* Tip Content */
.tip-content {
    background: var(--bg-accent);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--primary-blue);
}

.tip-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Navigation Buttons */
.nav-buttons {
    display: flex;
    gap: 1rem;
    justify-content: space-between;
    margin-top: 2rem;
}

.nav-button {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition-fast);
    border: none;
    min-width: 100px;
}

.prev-button {
    background: var(--bg-accent);
    color: var(--text-secondary);
    border: 1px solid var(--gray-300);
}

.prev-button:hover {
    background: var(--gray-200);
    color: var(--text-primary);
}

.next-button {
    background: var(--primary-blue);
    color: white;
}

.next-button:hover {
    background: var(--primary-blue-dark);
}

/* Link Buttons */
.link-button {
    background: none;
    border: none;
    color: var(--primary-blue);
    font-size: 0.875rem;
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
    margin-bottom: 1.5rem;
}

.link-button:hover {
    color: var(--primary-blue-dark);
}

/* Test Controls */
.test-instruction {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: center;
}

.test-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.heard-button {
    padding: 1rem 2rem;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.heard-button:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.test-info {
    text-align: center;
    color: var(--text-secondary);
}

.test-info p {
    margin: 0.25rem 0;
    font-size: 0.875rem;
}

/* Results Display */
.results-display {
    background: var(--bg-accent);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
    text-align: center;
}

.next-steps {
    margin-bottom: 1.5rem;
}

.next-steps h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.cta-section {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-accent);
    border-radius: var(--radius-lg);
}

.cta-section h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.cta-section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.primary-button {
    background: var(--primary-blue);
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    display: inline-block;
}

.primary-button:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-container {
        padding: 1rem;
    }
    
    .card-content {
        grid-template-columns: 1fr;
    }
    
    .image-section {
        min-height: 250px;
    }
    
    .content-section {
        padding: 2rem;
    }
    
    .content-section h1 {
        font-size: 2rem;
    }
    
    .start-button {
        width: 120px;
        height: 120px;
    }
    
    .start-button .button-text {
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: 0 1rem;
    }
    
    .logo-container h1 {
        font-size: 1.25rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .nav-link {
        font-size: 0.8rem;
        padding: 0.375rem 0.5rem;
    }
    
    .main-container {
        padding: 0.5rem;
    }
    
    .content-section {
        padding: 1.5rem;
    }
    
    .content-section h1 {
        font-size: 1.75rem;
    }
    
    .content-section h2 {
        font-size: 1.5rem;
    }
    
    .choice-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .choice-btn {
        width: 100%;
        max-width: 200px;
    }
    
    .progress-steps {
        gap: 1.5rem;
        padding: 1rem;
    }
    
    .step {
        font-size: 0.6875rem;
    }
    
    .nav-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .nav-button {
        width: 100%;
    }
}