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

:root {
    --primary-color: #1a1a2e;
    --secondary-color: #16213e;
    --accent-color: #0f3460;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f5f5f5;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --hover-color: #0a1929;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--white);
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    flex-wrap: wrap;
    align-items: center;
}

.nav-menu > li {
    position: relative;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
    display: block;
}

.nav-menu > li > a:hover,
.nav-menu > li > a.active {
    color: #4a9eff;
    border-bottom: 2px solid #4a9eff;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown > a::after {
    content: ' ▼';
    font-size: 0.7rem;
    margin-left: 0.3rem;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    min-width: 200px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    border-radius: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    margin-top: 0.5rem;
    list-style: none;
    padding: 0.5rem 0;
}

.dropdown:hover .dropdown-menu,
.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    color: var(--text-color);
    padding: 0.75rem 1.5rem;
    display: block;
    transition: background-color 0.2s ease;
    border-bottom: none;
}

.dropdown-menu a:hover,
.dropdown-menu a.active {
    background-color: #f0f7ff;
    color: var(--accent-color);
    border-bottom: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle:hover {
    color: #4a9eff;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.2rem;
    opacity: 0.8;
    max-width: 800px;
    margin: 0 auto;
}

/* Content Sections */
.content-section {
    padding: 3rem 0;
}

.intro {
    margin-bottom: 3rem;
}

.lead {
    font-size: 1.4rem;
    line-height: 2;
    color: var(--text-color);
    max-width: 1000px;
    margin: 0 auto;
    font-weight: 400;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
    text-align: center;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Quick Facts Grid */
.quick-facts {
    margin: 3rem 0;
}

.facts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.fact-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.fact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

.fact-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

.fact-card p {
    color: var(--text-color);
    font-size: 1rem;
    line-height: 1.6;
}

.fact-detail {
    color: var(--text-light);
    font-size: 0.85rem;
    display: block;
    margin-top: 0.3rem;
}

/* Topics Grid */
.topics-section {
    margin: 4rem 0;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.topic-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    display: block;
    border: 2px solid transparent;
}

.topic-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    border-color: var(--accent-color);
}

.topic-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    font-size: 1.4rem;
}

.topic-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* Page Content */
.page-content {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin: 2rem 0;
}

.page-content h2 {
    text-align: left;
    margin-top: 2rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--accent-color);
}

.page-content h2:first-child {
    margin-top: 0;
}

.page-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
}

.page-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.page-content ul,
.page-content ol {
    margin: 1rem 0 1rem 2rem;
    line-height: 1.8;
}

.page-content li {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.page-content strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* Info Boxes */
.info-box {
    background: #f0f7ff;
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 4px;
}

.info-box h4 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

/* Footer */
footer {
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

footer p {
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--primary-color);
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
        box-shadow: 0 4px 15px rgba(0,0,0,0.2);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        width: 100%;
    }

    .nav-menu.active {
        max-height: 1000px;
    }

    .nav-menu > li {
        width: 100%;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .nav-menu > li > a {
        padding: 1rem 1.5rem;
        border-bottom: none;
    }

    .nav-menu > li > a:hover,
    .nav-menu > li > a.active {
        background-color: rgba(255,255,255,0.1);
        border-bottom: none;
    }

    .dropdown > a::after {
        float: right;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: rgba(0,0,0,0.2);
        margin: 0;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .dropdown.active .dropdown-menu {
        max-height: 500px;
    }

    .dropdown-menu a {
        padding-left: 2.5rem;
        color: rgba(255,255,255,0.9);
    }

    .dropdown-menu a:hover,
    .dropdown-menu a.active {
        background-color: rgba(255,255,255,0.1);
        color: #4a9eff;
    }

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

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

    h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .nav-container {
        position: relative;
    }
}