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

:root {
    /* Sophisticated Color Palette */
    --bg-primary: #05070a;
    --bg-secondary: #0c0f16;
    --bg-card: #151923;
    --bg-tertiary: #1d2331;

    --accent-primary: #3b82f6;
    /* Trust Blue */
    --accent-secondary: #6366f1;
    /* Indigo */
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);

    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;

    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    --accent-safe: #10b981;

    --border-color: rgba(255, 255, 255, 0.08);
    --card-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --spacing-3xl: 8rem;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header Enhancement */
.main-header {
    background-color: rgba(5, 7, 10, 0.8);
    backdrop-filter: blur(12px);
    padding: var(--spacing-md) 0;
    position: fixed;
    /* Changed to fixed for constant access */
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.flex-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    display: block;
    line-height: 0;
}

.header-logo {
    height: 28px;
    width: auto;
    object-fit: contain;
}

.btn-home {
    padding: 0.75rem 1.5rem;
    background: var(--accent-primary);
    border: none;
    border-radius: 8px;
    color: #ffffff;
    font-size: 0.9375rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.btn-home:hover {
    background: var(--accent-secondary);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.35);
}

/* Hero Section Enhancement */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
    /* Richer background with multiple layers */
    background:
        radial-gradient(circle at 80% 20%, rgba(59, 130, 246, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 20% 80%, rgba(139, 92, 246, 0.08) 0%, transparent 40%),
        var(--bg-primary);
}

.hero::before {
    content: '';
    position: absolute;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: var(--accent-primary);
    filter: blur(150px);
    opacity: 0.05;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    animation: fadeIn 1s ease-out;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.badge {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    background: rgba(59, 130, 246, 0.12);
    color: var(--accent-primary);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 100px;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    margin-bottom: var(--spacing-xl);
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
    background: linear-gradient(to bottom, #fff 60%, rgba(255, 255, 255, 0.7));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.6;
    font-weight: 400;
}

.cta-button {
    padding: 1.25rem 2.5rem;
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.4);
    filter: brightness(1.1);
}

.cta-button:active {
    transform: translateY(0);
}

.hero-note {
    margin-top: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Diagnosis Info Section */
.diagnosis-info {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-primary);
}

.info-box {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: linear-gradient(180deg, rgba(245, 158, 11, 0.05) 0%, rgba(5, 7, 10, 0) 100%), var(--bg-card);
    border-radius: 24px;
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--accent-warning);
    /* Emphasis only on top */
    box-shadow: var(--card-shadow);
    position: relative;
    overflow: hidden;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--accent-warning);
    /* Professional amber */
    letter-spacing: -0.01em;
}

.info-description {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
    max-width: 800px;
    margin: 0 auto;
}

/* Questions Section */
.questions {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-primary);
}

.question-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.question-count-info {
    display: inline-block;
    font-size: 1.125rem;
    color: var(--accent-primary);
    font-weight: 600;
    padding: 1.25rem 2.5rem;
    /* Increased padding */
    background: rgba(59, 130, 246, 0.05);
    border: 1px solid rgba(59, 130, 246, 0.15);
    border-radius: 16px;
    line-height: 1.4;
}

#diagnosisForm {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.question-item {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-lg);
    transition: all 0.3s ease;
}

.question-item:hover {
    border-color: rgba(59, 130, 246, 0.3);
    background: var(--bg-tertiary);
    transform: translateX(4px);
}

.question-number {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8125rem;
    font-weight: 800;
    color: var(--accent-primary);
    font-family: 'JetBrains Mono', monospace;
    margin-top: -2px;
}

.question-content {
    flex: 1;
}

.question-text {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    line-height: 1.5;
}

.answer-options {
    display: flex;
    gap: var(--spacing-sm);
}

.radio-option {
    flex: 1;
    cursor: pointer;
    position: relative;
}

.radio-option input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radio-option span {
    display: block;
    padding: 1.25rem;
    /* Increased vertical padding from 1rem to 1.25rem */
    text-align: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.radio-option:hover {
    border-color: rgba(59, 130, 246, 0.5);
}

/* Radio Option Active States */
.radio-option input:checked+span {
    background: rgba(59, 130, 246, 0.15);
    border: 2px solid var(--accent-primary);
    color: var(--text-primary);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.radio-option input:checked+span::after {
    content: '✓';
    margin-left: 8px;
    font-size: 0.9rem;
    color: var(--accent-primary);
}

.radio-option:hover span {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
}

.radio-option:has(input[type="radio"]:checked) {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--accent-primary);
}

.submit-button {
    margin-top: var(--spacing-xl);
    padding: 1.25rem;
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.submit-button:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(59, 130, 246, 0.4);
}

.submit-button:active {
    transform: translateY(0);
}

/* Results Section */
.results {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-primary);
}

.results.hidden {
    display: none;
}

.result-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.risk-level {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.risk-badge {
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: 100px;
    font-size: 1.25rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.risk-badge.safe {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-success);
    border: 2px solid var(--accent-success);
}

.risk-badge.warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent-warning);
    border: 2px solid var(--accent-warning);
}

.risk-badge.danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-danger);
    border: 2px solid var(--accent-danger);
}

.risk-score {
    font-size: 0.9375rem;
    color: var(--text-muted);
    font-weight: 500;
}

.result-summary {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.result-summary p {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.result-summary p:last-child {
    margin-bottom: 0;
}

.problem-points {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.problem-points h3 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.problem-item {
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-left: 4px solid var(--accent-primary);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
}

.problem-item:last-child {
    margin-bottom: 0;
}

.problem-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.problem-description {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.problem-item.problem-critical {
    border-left-color: var(--accent-danger);
    background: linear-gradient(90deg, rgba(239, 68, 68, 0.1) 0%, var(--bg-tertiary) 100%);
}

.problem-item.problem-critical .problem-title {
    color: var(--accent-danger);
}

/* Restart Button */
.restart-container {
    text-align: center;
    margin: var(--spacing-xl) 0;
}

.restart-button {
    padding: 0.875rem 2rem;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.restart-button:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-muted);
    color: var(--text-primary);
}

/* Expert Comment Section */
.expert-comment {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(59, 130, 246, 0.05) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 16px;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-md);
}

.expert-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.expert-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.expert-text {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.expert-text:last-child {
    margin-bottom: 0;
}

.expert-text.cta-highlight {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(59, 130, 246, 0.08) 100%);
    border-left: 3px solid var(--accent-primary);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-top: var(--spacing-md);
    font-weight: 500;
    color: var(--text-primary);
}

/* Final CTA Section */
.final-cta {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: var(--spacing-2xl);
    text-align: center;
}

.cta-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    line-height: 1.4;
}

.cta-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.cta-button-secondary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: transparent;
    color: var(--accent-secondary);
    font-size: 1.125rem;
    font-weight: 600;
    border: 2px solid var(--accent-primary);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.cta-button-secondary:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--accent-secondary);
    transform: translateY(-2px);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.0625rem;
    }

    .cta-button {
        font-size: 1rem;
        padding: 0.875rem 2rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .info-description {
        font-size: 1rem;
    }

    .question-item {
        flex-direction: column;
        padding: var(--spacing-md);
    }

    .question-number {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .question-text {
        font-size: 1rem;
    }

    .answer-options {
        flex-direction: column;
    }

    .expert-comment {
        flex-direction: column;
        text-align: center;
    }

    .cta-title {
        font-size: 1.5rem;
    }

    .cta-subtitle {
        font-size: 1rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .info-box {
        padding: var(--spacing-md);
    }

    .question-item {
        padding: var(--spacing-sm);
    }

    .result-summary,
    .problem-points,
    .expert-comment,
    .final-cta {
        padding: var(--spacing-md);
    }
}