/* Global Styles & Variables */
:root {
    --primary-color: #3b82f6;
    /* Blue 500 */
    --primary-hover: #2563eb;
    /* Blue 600 */
    --bg-color: #f8f9fa;
    --text-color: #1f2937;
    /* Gray 800 */
    --text-muted: #6b7280;
    /* Gray 500 */
    --card-bg: #ffffff;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --header-bg: rgba(255, 255, 255, 0.8);
    --border-color: #e5e7eb;
}

[data-theme="dark"] {
    --primary-color: #60a5fa;
    /* Blue 400 */
    --primary-hover: #3b82f6;
    /* Blue 500 */
    --bg-color: #111827;
    /* Gray 900 */
    --text-color: #f3f4f6;
    /* Gray 100 */
    --text-muted: #9ca3af;
    /* Gray 400 */
    --card-bg: #1f2937;
    /* Gray 800 */
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.18);
    --header-bg: rgba(17, 24, 39, 0.8);
    --border-color: #374151;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--text-color);
}

p {
    color: var(--text-muted);
}

/* Navigation */
header {
    background-color: var(--header-bg) !important;
    border-bottom: 1px solid var(--border-color);
}

.nav-link {
    color: var(--text-muted);
    transition: color 0.3s ease, border-bottom-color 0.3s ease;
    border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Mobile Menu */
#mobile-menu {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    transition: background-color 0.2s;
}

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

/* Timeline */
.timeline-item::before {
    content: '';
    position: absolute;
    left: -29px;
    top: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--primary-color);
    border: 3px solid var(--bg-color);
    z-index: 1;
}

#timeline-container {
    border-left-color: var(--border-color);
}

/* Section Titles */
.section-title {
    position: relative;
    padding-bottom: 8px;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--primary-color);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
}

.stat-card {
    background-color: var(--card-bg);
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

/* Filters */
.filter-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

/* Charts */
.chart-container {
    position: relative;
    width: 100%;
    height: 400px;
    max-height: 50vh;
}

@media (max-width: 768px) {
    .chart-container {
        height: 300px;
    }
}

/* Innovations */
.innovation-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
}

.innovation-link {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.innovation-link:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Dark Mode Toggle */
#theme-toggle {
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s;
    color: var(--text-muted);
}

#theme-toggle:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--text-color);
}

[data-theme="dark"] #theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Background Canvas */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    /* Allow clicks to pass through */
}

/* Blog Styles */
.blog-post-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    transition: transform 0.2s;
}

.blog-post-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
}