/* Shared styles for landing and about pages */

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

:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --text-dark: #2c3e50;
    --text-muted: #7f8c8d;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
    --white: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(180deg, #f8f9fa 0%, #e9ecef 50%, #f8f9fa 100%);
    background-attachment: fixed;
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Navigation */
.navbar {
    background: var(--white);
    padding: 16px 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.navbar-brand {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    text-decoration: none;
}

.navbar-brand:hover {
    text-decoration: none;
    color: var(--primary-color);
}

.navbar-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.navbar-links a {
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.2s;
}

.navbar-links a:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.navbar-author {
    border-left: 1px solid var(--border-color);
    padding-left: 24px;
    margin-left: 8px;
}

/* Mobile menu button */
.navbar-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 5px;
}

.navbar-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: transform 0.3s, opacity 0.3s;
}

.navbar-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.navbar-toggle.active span:nth-child(2) {
    opacity: 0;
}

.navbar-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero Section */
.hero {
    position: relative;
    color: var(--white);
    padding: 100px 24px;
    text-align: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -10%;
    left: -5%;
    right: -5%;
    bottom: -10%;
    background-image: url('/assets/screenshots/world-timeline.png');
    background-size: cover;
    background-position: center;
    z-index: 0;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* Scrim: darker at top and bottom, slightly lighter in middle for depth */
    background: linear-gradient(
        180deg,
        rgba(30, 45, 60, 0.92) 0%,
        rgba(40, 55, 70, 0.82) 50%,
        rgba(30, 45, 60, 0.92) 100%
    );
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.4);
    letter-spacing: -0.5px;
}

.hero .tagline {
    font-size: 1.25rem;
    opacity: 0.92;
    margin-bottom: 32px;
    text-shadow: 0 1px 4px rgba(0,0,0,0.3);
    line-height: 1.7;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    text-decoration: none;
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--text-dark);
    text-decoration: none;
}

/* Section Styling */
.section {
    padding: 60px 24px;
}

.section-alt {
    background: var(--white);
}

.section-content {
    max-width: 1200px;
    margin: 0 auto;
}

.section h2 {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 32px;
    text-align: center;
}

/* Timeline Cards */
.timeline-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

a.timeline-card {
    display: block;
    text-decoration: none;
    color: inherit;
}

a.timeline-card:hover {
    text-decoration: none;
}

.timeline-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.timeline-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.18);
}

.timeline-card:hover .timeline-card-us::after {
    background: radial-gradient(
        ellipse at center,
        rgba(20, 50, 90, 0.6) 0%,
        rgba(30, 60, 100, 0.4) 60%,
        rgba(40, 70, 110, 0.3) 100%
    );
}

.timeline-card:hover .timeline-card-world::after {
    background: radial-gradient(
        ellipse at center,
        rgba(80, 50, 20, 0.6) 0%,
        rgba(90, 60, 30, 0.4) 60%,
        rgba(100, 70, 40, 0.3) 100%
    );
}

.timeline-card:hover .timeline-card-british::after {
    background: radial-gradient(
        ellipse at center,
        rgba(90, 25, 35, 0.6) 0%,
        rgba(100, 35, 45, 0.4) 60%,
        rgba(110, 45, 55, 0.3) 100%
    );
}

.timeline-card-image {
    position: relative;
    width: 100%;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 600;
    overflow: hidden;
}

.timeline-card-image::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 1400px;
    height: 600px;
    transform: translate(-50%, -50%);
    background-size: cover;
    background-position: center;
    z-index: 0;
}

.timeline-card-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    transition: background 0.3s ease;
}

/* US - Deep blue tint */
.timeline-card-us::after {
    background: radial-gradient(
        ellipse at center,
        rgba(20, 50, 90, 0.75) 0%,
        rgba(30, 60, 100, 0.55) 60%,
        rgba(40, 70, 110, 0.45) 100%
    );
}

/* World - Warm amber/bronze tint */
.timeline-card-world::after {
    background: radial-gradient(
        ellipse at center,
        rgba(80, 50, 20, 0.75) 0%,
        rgba(90, 60, 30, 0.55) 60%,
        rgba(100, 70, 40, 0.45) 100%
    );
}

/* British - Deep crimson/burgundy tint */
.timeline-card-british::after {
    background: radial-gradient(
        ellipse at center,
        rgba(90, 25, 35, 0.75) 0%,
        rgba(100, 35, 45, 0.55) 60%,
        rgba(110, 45, 55, 0.45) 100%
    );
}

.timeline-card-image span {
    position: relative;
    z-index: 2;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5), 0 0 20px rgba(0,0,0,0.3);
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Individual timeline card backgrounds */
.timeline-card-us::before {
    background-image: url('/assets/screenshots/us-timeline.png');
}

.timeline-card-world::before {
    background-image: url('/assets/screenshots/world-timeline.png');
}

.timeline-card-british::before {
    background-image: url('/assets/screenshots/british-timeline.png');
}

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

.timeline-card-body {
    padding: 20px;
}

.timeline-card h3 {
    font-size: 1.25rem;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.timeline-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.timeline-card .btn {
    width: 100%;
    text-align: center;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-top: 32px;
}

.feature-item {
    text-align: center;
    padding: 24px;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-item h3 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.feature-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Data Sources Summary */
.data-summary {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.data-summary p {
    color: var(--text-muted);
    margin-bottom: 16px;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 40px 24px;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255,255,255,0.8);
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--white);
    text-decoration: none;
}

.footer-copyright {
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
}

.footer-copyright a {
    color: rgba(255,255,255,0.8);
}

.footer-copyright a:hover {
    color: var(--white);
}

/* About Page Styles */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 24px;
}

.about-content h1 {
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.about-content h2 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-top: 48px;
    margin-bottom: 16px;
    text-align: left;
}

.about-content p {
    margin-bottom: 16px;
    color: #444;
}

.about-content ul {
    margin-left: 24px;
    margin-bottom: 16px;
}

.about-content li {
    margin-bottom: 8px;
    color: #444;
}

.citation-box {
    background: var(--bg-light);
    border-left: 4px solid var(--primary-color);
    padding: 16px 20px;
    margin: 24px 0;
    font-style: italic;
    color: var(--text-muted);
}

.warning-box {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 16px 20px;
    margin: 24px 0;
    color: #856404;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.95rem;
}

.data-table th,
.data-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--bg-light);
    font-weight: 600;
    color: var(--text-dark);
}

.data-table tr:hover {
    background: var(--bg-light);
}

.tech-list {
    list-style: none;
    margin-left: 0;
}

.tech-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.tech-list li:last-child {
    border-bottom: none;
}

/* Author Box */
.author-box {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 24px 28px;
    margin: 24px 0;
    border: 1px solid var(--border-color);
}

.author-box p {
    margin-bottom: 12px;
}

.author-box p:last-child {
    margin-bottom: 0;
}

.blog-link {
    font-size: 1.15rem;
    font-weight: 600;
}

.blog-link a {
    color: var(--primary-color);
}

.author-info {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.author-cta {
    margin-top: 20px;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

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

    .navbar-toggle {
        display: flex;
    }

    .navbar-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px 24px;
        gap: 0;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        border-top: 1px solid var(--border-color);
    }

    .navbar-links.active {
        display: flex;
    }

    .navbar-links a {
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
    }

    .navbar-links a:last-child {
        border-bottom: none;
    }

    .navbar-author {
        border-left: none;
        padding-left: 0;
        margin-left: 0;
    }

    .navbar-content {
        position: relative;
    }

    .section h2 {
        font-size: 1.5rem;
    }

    .timeline-grid {
        grid-template-columns: 1fr;
    }

    .about-content h1 {
        font-size: 2rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 16px;
    }
}