/* Landsat Next Website - Professional Styling */

:root {
    --primary-color: #0066cc;
    --secondary-color: #003d7a;
    --accent-color: #00a8e1;
    --text-color: #333;
    --light-bg: #f5f7fa;
    --white: #ffffff;
    --gray: #666;
    --border-color: #e0e0e0;
}

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

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

/* Header & Navigation */
header {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    color: var(--white);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.site-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.site-subtitle {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 300;
}

nav {
    background: var(--secondary-color);
    padding: 0;
    border-bottom: 3px solid var(--accent-color);
}

nav ul {
    list-style: none;
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    flex-wrap: wrap;
}

nav ul li {
    margin: 0;
}

nav ul li a {
    display: block;
    color: var(--white);
    text-decoration: none;
    padding: 1rem 1.5rem;
    transition: background 0.3s ease;
    font-weight: 500;
}

nav ul li a:hover,
nav ul li a.active {
    background: var(--primary-color);
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.1) 0%, rgba(0, 168, 225, 0.1) 100%);
    padding: 3rem 2rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 800px;
    margin: 0 auto;
}

/* Content Sections */
.content-section {
    margin-bottom: 3rem;
}

.content-section h2 {
    color: var(--secondary-color);
    font-size: 2rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--accent-color);
}

.content-section h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.content-section ul {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content-section ul li {
    margin-bottom: 0.5rem;
}

/* Info Boxes */
.info-box {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
    border-left: 4px solid var(--accent-color);
}

.info-box h3 {
    margin-top: 0;
}

.highlight-box {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.05) 0%, rgba(0, 168, 225, 0.05) 100%);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1.5rem 0;
    border: 2px solid var(--accent-color);
}

/* Grid Layout */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.grid-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.grid-item h3 {
    margin-top: 0;
    color: var(--primary-color);
}

/* Timeline */
.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline-item {
    padding: 1.5rem;
    background: var(--white);
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border-left: 4px solid var(--accent-color);
}

.timeline-item h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.timeline-item .date {
    font-weight: bold;
    color: var(--accent-color);
    font-size: 1.1rem;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

table th {
    background: var(--secondary-color);
    color: var(--white);
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

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

/* Buttons & Links */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s ease;
    font-weight: 500;
}

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

.btn-secondary {
    background: var(--accent-color);
}

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

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

footer p {
    margin-bottom: 0.5rem;
}

footer a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-links {
    margin-top: 1rem;
    font-size: 0.9rem;
}

.footer-links a {
    margin: 0 1rem;
}

/* Source Citation */
.source {
    font-size: 0.9rem;
    color: var(--gray);
    font-style: italic;
    margin-top: 0.5rem;
}

.sources-section {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.sources-section h3 {
    color: var(--secondary-color);
}

.sources-section ul {
    list-style: none;
    margin-left: 0;
}

.sources-section ul li {
    padding: 0.5rem 0;
}

.sources-section ul li a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.sources-section ul li a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .site-title {
        font-size: 1.5rem;
    }

    nav ul {
        flex-direction: column;
        padding: 0;
    }

    nav ul li a {
        padding: 0.75rem 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

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

    main {
        padding: 0 1rem;
    }
}

/* Accessibility */
a:focus,
button:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    header,
    nav,
    footer {
        display: none;
    }

    body {
        font-size: 12pt;
    }

    a {
        text-decoration: underline;
    }
}