/* MSU Academic Theme - Michigan State University Branding */

:root {
    /* MSU Color Palette */
    --msu-green: #18453B;        /* Spartan Green (primary) */
    --msu-green-hover: #2a5b50;  /* Accessible hover variant */
    --msu-light-green: #A7C6AD;  /* Supportive tint (accent) */
    --msu-white: #ffffff;
    --msu-gray-50: #f9fafb;
    --msu-gray-100: #f3f4f6;
    --msu-gray-200: #e5e7eb;
    --msu-gray-700: #4a4a4a;
    --msu-gray-900: #1a1a1a;

    /* Semantic tokens mapped to MSU palette */
    --color-primary: var(--msu-green);
    --color-primary-dark: var(--msu-green-hover);
    --color-accent: var(--msu-light-green);
    --color-background: var(--msu-white);
    --color-surface: var(--msu-gray-50);
    --color-text: var(--msu-gray-900);
    --color-text-light: var(--msu-gray-700);
    --color-border: var(--msu-gray-200);

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-heading: Georgia, "Times New Roman", Times, serif;

    /* Layout */
    --max-width: 1200px;
    --spacing-unit: 1rem;
}

/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-primary-dark);
    line-height: 1.3;
    margin-bottom: var(--spacing-unit);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-unit);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

/* Underline links in content areas only */
.page-content a,
.article-content a,
.intro > p a,
.recommendation-row a {
    text-decoration: underline;
}

/* Header */
.site-header {
    background-color: var(--color-primary);
    color: var(--msu-white);
    padding: var(--spacing-unit) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border-bottom: 3px solid var(--color-accent);
}

/* Recommendation full-bleed row */
.recommendation-row {
    width: 100vw;
    margin-left: calc(50% - 50vw);
    margin-top: 0.75rem;
    margin-bottom: 0.1rem;
}
.recommendation-row__inner {
    text-align: center;
    font-size: 1rem;
}
.recommendation-link {
    text-decoration: underline;
    color: var(--color-primary-dark);
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--msu-white);
    font-weight: bold;
}

.site-title:hover {
    color: var(--msu-white);
    text-decoration: none;
    opacity: 0.95;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: calc(var(--spacing-unit) * 1.5);
}

.nav-links a {
    color: var(--msu-white);
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
    background-color: rgba(255, 255, 255, 0.1);
    border-bottom-color: var(--color-accent);
    text-decoration: none;
    color: var(--msu-white);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--msu-white);
    margin: 5px 0;
    transition: 0.3s;
}

/* Main content */
.site-main {
    flex: 1;
    padding: calc(var(--spacing-unit) * 3) 0;
}

/* Hero section */
.hero {
    text-align: center;
    padding: calc(var(--spacing-unit) * 3) 0; /* reduced from 4 */
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--msu-white) 100%);
    margin: calc(var(--spacing-unit) * -3) calc(var(--spacing-unit) * -1) calc(var(--spacing-unit) * 1.5); /* reduced bottom margin from 3 */
    border-bottom: 2px solid var(--color-accent);
}

.hero-image-container {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.hero-profile-image {
    display: block;
    margin: 0 auto;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: 5px solid var(--color-primary);
    object-fit: cover;
    box-shadow: 0 8px 24px rgba(24, 69, 59, 0.25);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-profile-image:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 32px rgba(24, 69, 59, 0.35);
}

.hero .subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Intro section */
.intro {
    padding: calc(var(--spacing-unit) * 1) 0; /* reduced from 2 */
}

.intro h2 {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.intro > .intro-content > p {
    text-align: center;
    max-width: 800px;
    margin: 0 auto calc(var(--spacing-unit) * 2);
    font-size: 1.125rem;
}

/* Cards / Quick links */
.quick-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 2);
}

.card {
    display: block;
    background-color: var(--msu-white);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: calc(var(--spacing-unit) * 1.5);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    text-decoration: none;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(24, 69, 59, 0.15);
    border-color: var(--color-accent);
    text-decoration: none;
}

.card h3 {
    color: var(--color-primary);
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.card p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* Page content */
.page-content, .article-content {
    max-width: 800px;
    margin: 0 auto;
}

.page-header, .article-header {
    margin-bottom: calc(var(--spacing-unit) * 2);
    padding-bottom: var(--spacing-unit);
    border-bottom: 1px solid var(--color-border);
}

.page-header .subtitle {
    color: var(--color-text-light);
    font-size: 1.25rem;
}

.page-body, .article-body {
    font-size: 1.125rem;
}

.page-body h2, .article-body h2 {
    margin-top: calc(var(--spacing-unit) * 2);
}

.page-body ul, .page-body ol,
.article-body ul, .article-body ol {
    margin-left: calc(var(--spacing-unit) * 1.5);
    margin-bottom: var(--spacing-unit);
}

.page-body li, .article-body li {
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

/* Article meta */
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-unit);
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.tags {
    display: flex;
    gap: 0.5rem;
}

.tag {
    background-color: var(--color-accent);
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Recent posts */
.recent-posts {
    padding: calc(var(--spacing-unit) * 2) 0;
    border-top: 1px solid var(--color-border);
    margin-top: calc(var(--spacing-unit) * 2);
}

.recent-posts h2 {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.articles-list {
    display: grid;
    gap: calc(var(--spacing-unit) * 2);
}

.article-preview {
    padding: var(--spacing-unit);
    background-color: var(--color-surface);
    border-radius: 8px;
}

.article-preview h3 {
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.article-preview time {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* Footer */
.site-footer {
    background-color: var(--msu-gray-900);
    color: var(--msu-white);
    padding: calc(var(--spacing-unit) * 2) 0;
    margin-top: auto;
    border-top: 3px solid var(--color-primary);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 2);
}

.footer-section h3 {
    color: var(--color-accent);
    font-size: 1rem;
    margin-bottom: var(--spacing-unit);
}

.footer-section p {
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    font-size: 0.875rem;
    color: var(--msu-gray-100);
}

.social-links {
    list-style: none;
    display: flex;
    gap: var(--spacing-unit);
}

.social-links a {
    color: var(--msu-white);
    opacity: 0.9;
    transition: opacity 0.2s ease;
}

.social-links a:hover {
    opacity: 1;
    color: var(--color-accent);
    text-decoration: none;
}

.footer-section a {
    color: var(--msu-white);
    text-decoration: underline;
}

.footer-section a:hover {
    color: var(--color-accent);
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--msu-white);
    border: 2px solid var(--color-primary);
    border-radius: 6px;
    padding: 0.65rem 1.25rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
}

.btn:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--msu-white);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(24, 69, 59, 0.2);
}

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

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

/* Code highlighting */
.highlight {
    background-color: var(--msu-gray-50);
    border: 1px solid var(--color-border);
    padding: var(--spacing-unit);
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: var(--spacing-unit);
}

pre {
    font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
    font-size: 0.875rem;
}

code {
    font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
    background-color: var(--msu-gray-100);
    color: var(--color-primary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-unit);
    border: 1px solid var(--color-border);
}

th, td {
    border: 1px solid var(--color-border);
    padding: 0.75rem;
    text-align: left;
}

th {
    background-color: var(--color-primary);
    color: var(--msu-white);
    font-weight: 600;
}

tr:nth-child(even) {
    background-color: var(--msu-gray-50);
}

tr:hover {
    background-color: var(--msu-gray-100);
}

/* Forms */
input, textarea, select {
    border: 2px solid var(--color-border);
    border-radius: 6px;
    padding: 0.65rem;
    font: inherit;
    width: 100%;
    transition: border-color 0.2s ease;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(24, 69, 59, 0.1);
}

label {
    color: var(--color-text);
    font-weight: 500;
    display: block;
    margin-bottom: 0.5rem;
}

/* Profile image styling */
.page-content img[alt="Profile photo"],
.article-content img[alt="Profile photo"] {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 4px solid var(--color-primary);
    box-shadow: 0 4px 12px rgba(24, 69, 59, 0.2);
    object-fit: cover;
}

/* Responsive design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-primary);
        flex-direction: column;
        padding: var(--spacing-unit);
        gap: 0;
    }

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

    .nav-links li {
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-links a {
        display: block;
        padding: var(--spacing-unit);
    }

    .nav-toggle {
        display: block;
    }

    .hero-profile-image {
        width: 225px;
        height: 225px;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }

    /* Stack profile image on mobile */
    .page-content img[alt="Profile photo"],
    .article-content img[alt="Profile photo"] {
        float: none !important;
        display: block;
        margin: 0 auto 1.5rem !important;
        width: 150px;
        height: 150px;
    }
}