/* Nexus by Yuval Noah Harari - Book-specific styles */
/* Theme: Blue/Cyan for information and technology */

:root {
    --accent-color: #3b82f6;
    --accent-color-dark: #1d4ed8;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
    --section-title-bg: #1e3a5f;
    --key-box-color: #0891b2;
    --key-box-bg: #f0f9ff;
    --verse-bg: #eff6ff;
    --intro-bg: #f0f9ff;
}

/* Central node with tech gradient */
.central-node {
    background: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
}

/* Section title backgrounds */
.section-title {
    background: var(--section-title-bg);
}

/* Chapter card hover effect */
.chapter-card:hover {
    border-color: var(--accent-color);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.2);
}

/* Authors styling */
.authors {
    font-size: 1.3em;
    color: #64748b;
    margin-bottom: 10px;
}

/* Book subtitle */
.book-subtitle {
    font-size: 1.1em;
    color: #475569;
    font-style: italic;
    margin-bottom: 30px;
}

/* Key concept boxes - for Harari's main ideas */
.concept-box {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-left: 4px solid var(--accent-color);
    padding: 20px 25px;
    margin: 25px 0;
    border-radius: 0 8px 8px 0;
}

.concept-box h3 {
    color: var(--accent-color-dark);
    margin-top: 0;
    margin-bottom: 10px;
}

/* Information network visualization box */
.network-box {
    background: #1e293b;
    color: #e2e8f0;
    padding: 25px;
    border-radius: 12px;
    margin: 25px 0;
    position: relative;
    overflow: hidden;
}

.network-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #06b6d4, #3b82f6);
}

.network-box h4 {
    color: #06b6d4;
    margin-top: 0;
}

/* Historical example box */
.historical-example {
    background: #fefce8;
    border: 1px solid #fde047;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.historical-example h4 {
    color: #a16207;
    margin-top: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.historical-example h4::before {
    content: '📜';
}

/* AI/Technology insight box */
.ai-insight {
    background: linear-gradient(135deg, #fdf4ff 0%, #f3e8ff 100%);
    border-left: 4px solid #a855f7;
    padding: 20px 25px;
    margin: 25px 0;
    border-radius: 0 8px 8px 0;
}

.ai-insight h4 {
    color: #7c3aed;
    margin-top: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ai-insight h4::before {
    content: '🤖';
}

/* Warning/concern box */
.warning-box {
    background: #fef2f2;
    border-left: 4px solid #ef4444;
    padding: 20px 25px;
    margin: 25px 0;
    border-radius: 0 8px 8px 0;
}

.warning-box h4 {
    color: #dc2626;
    margin-top: 0;
}

/* Quote from the book */
.harari-quote {
    background: #f8fafc;
    border-left: 4px solid #94a3b8;
    padding: 20px 25px;
    margin: 25px 0;
    font-style: italic;
    color: #475569;
}

.harari-quote cite {
    display: block;
    margin-top: 10px;
    font-style: normal;
    color: #64748b;
    font-size: 0.9em;
}

/* Key argument styling */
.key-argument {
    background: var(--key-box-bg);
    border: 2px solid var(--accent-color);
    padding: 20px;
    border-radius: 12px;
    margin: 25px 0;
}

.key-argument h4 {
    color: var(--accent-color-dark);
    margin-top: 0;
    border-bottom: 1px solid #bfdbfe;
    padding-bottom: 10px;
}

/* Chapter theme badge */
.chapter-theme {
    display: inline-block;
    background: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85em;
    margin-top: 8px;
}

/* Part labels in chapter cards */
.part-label {
    font-size: 0.75em;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

/* Philosophy box - reusing from parenting book pattern */
.philosophy {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: 12px;
    padding: 30px;
    margin: 30px 0;
    text-align: center;
}

.philosophy blockquote {
    font-size: 1.2em;
    color: #1e40af;
    font-style: italic;
    margin: 0;
    line-height: 1.6;
}

.philosophy cite {
    display: block;
    margin-top: 15px;
    color: #64748b;
    font-style: normal;
}

/* Timeline styling for historical progression */
.timeline {
    position: relative;
    padding-left: 30px;
    margin: 25px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, #3b82f6, #06b6d4);
}

.timeline-item {
    position: relative;
    padding: 15px 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 20px;
    width: 12px;
    height: 12px;
    background: #3b82f6;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 0 0 2px #3b82f6;
}

.timeline-item h4 {
    color: var(--accent-color-dark);
    margin: 0 0 8px 0;
}

/* Intro section styling */
.intro {
    background: var(--intro-bg);
    border-left: 4px solid var(--accent-color);
}

/* Quick wins styling */
.quick-wins {
    background: linear-gradient(135deg, #ecfeff 0%, #f0f9ff 100%);
    border-radius: 12px;
    padding: 25px;
    margin: 30px 0;
}

.quick-wins h3 {
    color: var(--accent-color-dark);
    margin-top: 0;
}

.quick-wins ul {
    list-style: none;
    padding-left: 0;
}

.quick-wins li {
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
}

.quick-wins li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}