/* ============================================
   MEL SLATER - ACADEMIC WEBSITE
   Clean, professional, accessibility-focused
   ============================================ */

/* CSS Variables for easy theming */
:root {
  --color-primary: #1a365d;
  --color-primary-light: #2c5282;
  --color-accent: #c53030;
  --color-text: #2d3748;
  --color-text-light: #4a5568;
  --color-text-muted: #718096;
  --color-bg: #ffffff;
  --color-bg-alt: #f7fafc;
  --color-border: #e2e8f0;
  --color-link: #2b6cb0;
  --color-link-hover: #1a4971;
  
  --font-serif: 'Palatino Linotype', 'Book Antiqua', Palatino, Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  
  --max-width: 1100px;
  --spacing-unit: 1rem;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary);
  margin-top: 0;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 1.875rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}

h3 {
  font-size: 1.375rem;
  margin-bottom: 1rem;
  color: var(--color-primary-light);
}

p {
  margin: 0 0 1.25rem 0;
}

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

a:hover, a:focus {
  color: var(--color-link-hover);
  text-decoration: underline;
}

/* Header */
.site-header {
  background: var(--color-primary);
  color: white;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  margin: 0;
  font-size: 1.5rem;
  font-family: var(--font-serif);
}

.site-title a {
  color: white;
  text-decoration: none;
}

.site-title a:hover {
  text-decoration: none;
  opacity: 0.9;
}

.site-tagline {
  font-size: 0.875rem;
  opacity: 0.85;
  margin-left: 1rem;
  display: none;
}

@media (min-width: 900px) {
  .site-tagline {
    display: inline;
  }
}

/* Navigation */
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.main-nav a {
  display: block;
  padding: 0.5rem 1rem;
  color: white;
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.9375rem;
  transition: background-color 0.2s ease;
}

.main-nav a:hover,
.main-nav a:focus {
  background-color: rgba(255,255,255,0.15);
  text-decoration: none;
}

.main-nav a.active {
  background-color: rgba(255,255,255,0.2);
  font-weight: 500;
}

/* Main Content */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 2rem;
}

/* Page Header */
.page-header {
  margin-bottom: 2.5rem;
}

.page-header p {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 800px;
}

/* Home Page */
.home-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .home-intro {
    grid-template-columns: 250px 1fr;
  }
}

.profile-photo {
  text-align: center;
}

.profile-photo img {
  width: 200px;
  height: 250px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.profile-photo-placeholder {
  width: 200px;
  height: 250px;
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-border) 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin: 0 auto;
}

.intro-text {
  font-size: 1.125rem;
}

.intro-text p:first-child {
  font-size: 1.25rem;
  color: var(--color-primary);
  font-family: var(--font-serif);
}

/* Bio Section */
.bio-section {
  background: var(--color-bg-alt);
  padding: 2rem;
  border-radius: 8px;
  margin-bottom: 3rem;
  border-left: 4px solid var(--color-primary);
}

/* Activities List */
.activities-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.activities-list li {
  padding-left: 1.5rem;
  position: relative;
}

.activities-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

/* Cards (for Students, Projects, Blog) */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transform: translateY(-2px);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.card h3 a {
  color: var(--color-primary);
}

.card-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.card-description {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

/* Student Cards - List View */
.students-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.student-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: box-shadow 0.2s ease;
}

@media (min-width: 600px) {
  .student-card {
    grid-template-columns: auto 1fr;
    align-items: start;
  }
}

.student-card:hover {
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.student-year {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  min-width: 80px;
}

.student-year.current {
  color: var(--color-accent);
}

.student-info h3 {
  margin: 0 0 0.25rem 0;
  font-size: 1.125rem;
}

.student-institution {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.student-thesis {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  font-style: italic;
}

.student-links {
  margin-top: 0.5rem;
  font-size: 0.875rem;
}

.student-links a {
  margin-right: 1rem;
}

/* Project Cards */
.project-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

.project-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.project-image {
  height: 180px;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.project-image-placeholder {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.project-content {
  padding: 1.5rem;
}

.project-content h3 {
  margin-top: 0;
  margin-bottom: 0.25rem;
}

.project-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.project-years {
  display: inline-block;
  background: var(--color-primary);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8125rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

/* Publications Page */
.publication-source {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem 2rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s ease;
}

.publication-source:hover {
  border-color: var(--color-primary-light);
}

.publication-source h3 {
  margin: 0 0 0.25rem 0;
}

.publication-source p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* Blog Cards */
.blog-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
}

.blog-card h3 {
  margin-top: 0;
}

.blog-date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.blog-summary {
  color: var(--color-text-light);
}

.blog-content {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  white-space: pre-line;
}

/* Contact Page */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-info {
  background: var(--color-bg-alt);
  padding: 2rem;
  border-radius: 8px;
}

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

.contact-address {
  font-style: normal;
  line-height: 1.8;
}

.contact-email {
  margin-top: 1.5rem;
  font-size: 1.125rem;
}

.contact-email a {
  font-weight: 500;
}

.social-links {
  margin-top: 1.5rem;
  display: flex;
  gap: 1rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: white;
  border-radius: 4px;
  font-size: 0.875rem;
  transition: background-color 0.2s ease;
}

.social-link:hover {
  background: var(--color-primary-light);
  color: white;
  text-decoration: none;
}

/* Footer */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 2rem;
  margin-top: 3rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.site-footer a {
  color: var(--color-text-light);
}

/* Utility Classes */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.loading {
  text-align: center;
  padding: 3rem;
  color: var(--color-text-muted);
}

.error-message {
  background: #fed7d7;
  color: #c53030;
  padding: 1rem;
  border-radius: 8px;
  margin: 1rem 0;
}

/* Print Styles */
@media print {
  .site-header,
  .site-footer {
    display: none;
  }
  
  .main-content {
    padding: 0;
  }
  
  a {
    color: inherit;
    text-decoration: underline;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
}