/* Cervical Spine Interactive Guide - Styles */
/* Design System: Medical/Anatomical Theme with Parchment & Ink palette */

:root {
    /* Color Palette - Parchment & Ink */
    --color-parchment: #F4ECD8;
    --color-parchment-dark: #D4C5A9;
    --color-ink: #2C2C2C;
    --color-ink-light: #4a4a4a;
    --color-accent: #8B4513;
    --color-accent-light: #A0522D;
    --color-bone: #E8E4DF;
    --color-bone-shadow: #C8B8A0;
    --color-highlight: #D4A574;
    --color-solution: #2D6A1E;
    --color-problem: #8B2635;
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Sans 3', -apple-system, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, var(--color-parchment) 0%, #ebe5d5 100%);
    color: var(--color-ink);
    min-height: 100vh;
    line-height: 1.6;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.header {
    text-align: center;
    padding: var(--spacing-xl) 0;
    border-bottom: 2px solid var(--color-parchment-dark);
    margin-bottom: var(--spacing-xl);
}

.title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--color-ink);
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-xs);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.subtitle {
    font-family: var(--font-display);
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    font-weight: 400;
    color: var(--color-accent);
    font-style: italic;
    margin-bottom: var(--spacing-sm);
}

.instruction {
    font-size: 0.95rem;
    color: var(--color-ink-light);
    font-weight: 400;
    opacity: 0.8;
}

/* Main Content Layout */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    flex: 1;
    align-items: start;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* Spine Container */
.spine-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: var(--spacing-lg);
    background: linear-gradient(180deg, rgba(255,255,255,0.5) 0%, rgba(244,236,216,0.3) 100%);
    border-radius: 20px;
    box-shadow: 
        inset 0 2px 10px rgba(0,0,0,0.05),
        0 4px 20px rgba(0,0,0,0.08);
    position: sticky;
    top: var(--spacing-lg);
}

.spine-visualization {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    width: 100%;
    max-width: 300px;
}

/* Skull Base */
.skull-base {
    width: 100%;
    max-width: 200px;
    margin-bottom: -10px;
    z-index: 10;
}

.skull-svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 3px 6px rgba(0,0,0,0.15));
}

.skull-label {
    font-family: var(--font-display);
    font-size: 10px;
    fill: var(--color-ink);
    font-weight: 600;
    opacity: 0.7;
}

/* Vertebra Styles */
.vertebra {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: all var(--transition-medium);
    position: relative;
    width: 100%;
    margin: -5px 0;
}

.vertebra:hover {
    transform: scale(1.05);
    z-index: 20;
}

.vertebra:hover .vertebra-body {
    filter: drop-shadow(0 8px 16px rgba(139, 69, 19, 0.3));
}

.vertebra.active {
    transform: scale(1.08);
    z-index: 30;
}

.vertebra.active .vertebra-body {
    filter: drop-shadow(0 10px 20px rgba(139, 69, 19, 0.4));
}

.vertebra.active .vertebra-svg {
    filter: brightness(1.1);
}

.vertebra-body {
    width: 100%;
    max-width: 140px;
    transition: all var(--transition-medium);
}

.vertebra-svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15));
    transition: all var(--transition-medium);
}

.vertebra-label {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 700;
    fill: var(--color-ink);
    pointer-events: none;
}

.vertebra-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: -15px;
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-medium);
    pointer-events: none;
}

.vertebra:hover .vertebra-info,
.vertebra.active .vertebra-info {
    opacity: 1;
    transform: translateY(0);
}

.vertebra-info .level {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-accent);
}

.vertebra-info .name {
    font-size: 0.7rem;
    color: var(--color-ink-light);
    font-style: italic;
}

/* Thoracic Transition */
.thoracic-transition {
    width: 100%;
    max-width: 200px;
    margin-top: 10px;
    opacity: 0.6;
}

.thoracic-svg {
    width: 100%;
    height: auto;
}

.thoracic-label {
    font-family: var(--font-display);
    font-size: 9px;
    fill: var(--color-ink);
    opacity: 0.7;
}

/* Info Panel */
.info-panel {
    background: linear-gradient(145deg, #ffffff 0%, var(--color-parchment) 100%);
    border-radius: 20px;
    padding: var(--spacing-xl);
    box-shadow: 
        0 10px 40px rgba(0,0,0,0.1),
        0 2px 8px rgba(0,0,0,0.05);
    border: 1px solid var(--color-parchment-dark);
    min-height: 500px;
    position: relative;
    overflow: hidden;
}

.info-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-highlight), var(--color-accent));
}

.info-content {
    position: relative;
    z-index: 1;
}

/* Welcome Message */
.welcome-message {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.welcome-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
    opacity: 0.7;
}

.spine-icon {
    width: 100%;
    height: 100%;
}

.welcome-message h2 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--color-ink);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.welcome-message p {
    color: var(--color-ink-light);
    margin-bottom: var(--spacing-sm);
    font-size: 1.05rem;
}

.feature-list {
    list-style: none;
    text-align: left;
    max-width: 280px;
    margin: var(--spacing-md) auto;
    padding: var(--spacing-md);
    background: rgba(139, 69, 19, 0.05);
    border-radius: 12px;
}

.feature-list li {
    padding: var(--spacing-xs) 0;
    color: var(--color-ink);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.bullet {
    color: var(--color-accent);
    font-size: 0.8rem;
}

.hint {
    font-style: italic;
    color: var(--color-accent) !important;
    margin-top: var(--spacing-lg);
    font-size: 0.9rem !important;
}

/* Vertebra Detail View */
.vertebra-detail {
    animation: fadeInUp 0.5s ease;
}

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

.detail-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-parchment-dark);
}

.vertebra-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-bone) 0%, var(--color-parchment-dark) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.vertebra-icon svg {
    width: 60px;
    height: 60px;
}

.detail-title {
    flex: 1;
}

.detail-title h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--color-ink);
    margin-bottom: 0.25rem;
}

.detail-title .subtitle {
    font-size: 1rem;
    color: var(--color-ink-light);
    font-style: italic;
}

/* Section Styles */
.detail-section {
    margin-bottom: var(--spacing-lg);
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-parchment-dark);
}

.section-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
}

.section-icon.problem {
    background: var(--color-problem);
    color: white;
}

.section-icon.solution {
    background: var(--color-solution);
    color: white;
}

.section-icon.info {
    background: var(--color-accent);
    color: white;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-ink);
}

.section-content {
    padding-left: calc(24px + var(--spacing-xs));
}

.problem-list, .solution-list {
    list-style: none;
}

.problem-list li, .solution-list li {
    padding: var(--spacing-xs) 0;
    position: relative;
    padding-left: 1.5rem;
    color: var(--color-ink-light);
    line-height: 1.7;
}

.problem-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-problem);
    font-weight: bold;
    font-size: 1.2rem;
}

.solution-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-solution);
    font-weight: bold;
}

/* Function Tags */
.function-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.function-tag {
    background: linear-gradient(135deg, var(--color-parchment-dark) 0%, var(--color-bone) 100%);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--color-ink);
    border: 1px solid var(--color-bone-shadow);
}

/* Nerve Map */
.nerve-map {
    background: rgba(139, 69, 19, 0.05);
    border-radius: 12px;
    padding: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.nerve-title {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.nerve-areas {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.nerve-area {
    background: white;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--color-ink-light);
    border: 1px solid var(--color-parchment-dark);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
    border-top: 1px solid var(--color-parchment-dark);
    color: var(--color-ink-light);
    font-size: 0.85rem;
    opacity: 0.7;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-md);
    }
    
    .spine-container {
        position: relative;
        padding: var(--spacing-md);
    }
    
    .vertebra-body {
        max-width: 120px;
    }
    
    .info-panel {
        padding: var(--spacing-lg);
        min-height: auto;
    }
    
    .detail-header {
        flex-direction: column;
        text-align: center;
    }
    
    .section-content {
        padding-left: 0;
    }
}

/* Animation for active state pulse */
@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(139, 69, 19, 0.4);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(139, 69, 19, 0);
    }
}

.vertebra.active .vertebra-body {
    animation: pulse 2s infinite;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-parchment);
}

::-webkit-scrollbar-thumb {
    background: var(--color-parchment-dark);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}