/* C3 Lab - Community-Centered Computing Lab
   MSU Denver Branding Colors:
   - Primary Red: #A01C30
   - Secondary Blue: #002E5D
   - White: #FFFFFF
*/

/* ============================================
   CSS Variables
   ============================================ */
:root {
  /* MSU Denver Colors */
  --color-primary: #A01C30;
  --color-primary-dark: #7d1526;
  --color-secondary: #002E5D;
  --color-secondary-light: #003d7a;

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-500: #6b7280;
  --color-gray-700: #374151;
  --color-gray-900: #111827;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-gray-700);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-gray-900);
  margin-top: 0;
}

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

p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ============================================
   Accessibility: Focus Styles
   ============================================ */
a:focus-visible,
button:focus-visible,
.btn:focus-visible,
.nav-link:focus-visible,
.project-link:focus-visible,
.btn-bili:focus-visible,
.app-badge:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* High contrast focus for elements on dark backgrounds */
.hero a:focus-visible,
.hero .btn:focus-visible,
.site-footer a:focus-visible {
  outline-color: var(--color-white);
}

/* Skip Link for Keyboard Navigation */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: 0 0 6px 6px;
  font-weight: 600;
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   Header
   ============================================ */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--spacing-md) var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  text-decoration: none;
  font-family: var(--font-serif);
  font-weight: 700;
}

.logo-c3 {
  font-size: 1.75rem;
  color: var(--color-primary);
}

.logo-lab {
  font-size: 1.25rem;
  color: var(--color-secondary);
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: var(--spacing-sm);
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-gray-700);
  transition: var(--transition-fast);
}

.nav-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-xl);
}

.nav-link {
  color: var(--color-gray-700);
  font-weight: 500;
  padding: var(--spacing-sm) 0;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--spacing-md) var(--container-padding);
    gap: 0;
  }

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

  .nav-link {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-gray-100);
  }

  .nav-link.active::after {
    display: none;
  }
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
  min-height: calc(100vh - 200px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
  color: var(--color-white);
  padding: var(--spacing-3xl) var(--container-padding);
  text-align: center;
}

.hero-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.hero-title {
  font-size: 3rem;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.hero-title .highlight {
  color: var(--color-primary);
  background: var(--color-white);
  padding: 0 0.25em;
  border-radius: 4px;
}

.hero-subtitle {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
}

.hero-tagline {
  font-size: 1rem;
  opacity: 0.8;
  margin-bottom: var(--spacing-xl);
}

.hero-tagline a {
  color: var(--color-white);
  text-decoration: underline;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-weight: 600;
  border-radius: 6px;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-secondary);
  text-decoration: none;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }
}

/* ============================================
   Section Styles
   ============================================ */
.section {
  padding: var(--spacing-3xl) var(--container-padding);
}

.section-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  color: var(--color-gray-500);
  font-size: 1.1rem;
}

.section-alt {
  background: var(--color-gray-50);
}

/* ============================================
   Project Cards
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

.project-card {
  background: var(--color-white);
  border-radius: 12px;
  padding: var(--spacing-xl);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid var(--color-gray-200);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.15);
}

.project-card-title {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-sm);
}

.project-card-funding {
  display: inline-block;
  background: var(--color-gray-100);
  color: var(--color-gray-700);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.project-card-description {
  color: var(--color-gray-500);
  margin-bottom: var(--spacing-lg);
}

.project-card-link {
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}

.project-card-link::after {
  content: '\2192';
}

/* ============================================
   Team Section
   ============================================ */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
}

.team-member {
  text-align: center;
}

.team-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto var(--spacing-lg);
  border: 4px solid var(--color-primary);
}

.team-name {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-xs);
}

.team-role {
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.team-title {
  color: var(--color-gray-500);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

.team-bio {
  color: var(--color-gray-700);
  font-size: 0.95rem;
  line-height: 1.7;
}

.team-projects {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-gray-200);
}

.team-projects-label {
  font-weight: 600;
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
}

.team-projects-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
}

.team-projects-list li {
  padding: var(--spacing-xs) 0;
  color: var(--color-gray-500);
}

/* ============================================
   Updates/News
   ============================================ */
.updates-list {
  max-width: 800px;
  margin: 0 auto;
}

.update-item {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.update-item:last-child {
  border-bottom: none;
}

.update-date {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  margin-bottom: var(--spacing-sm);
}

.update-title {
  margin-bottom: var(--spacing-sm);
}

.update-title a {
  color: var(--color-secondary);
}

.update-excerpt {
  color: var(--color-gray-500);
}

/* ============================================
   Page Styles
   ============================================ */
.page,
.project,
.post {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--container-padding);
}

.page-header,
.project-header,
.post-header {
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-gray-200);
}

.page-title,
.project-title,
.post-title {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-md);
}

.page-subtitle,
.project-tagline {
  font-size: 1.25rem;
  color: var(--color-gray-500);
}

.project-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
  background: var(--color-gray-50);
  border-radius: 8px;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  text-align: left;
}

.meta-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meta-value {
  color: var(--color-gray-900);
  font-weight: 500;
}

.copi-entry {
  display: block;
  margin-bottom: var(--spacing-sm);
}

.copi-entry:last-child {
  margin-bottom: 0;
}

.copi-name {
  display: block;
}

.copi-affiliation {
  display: block;
  font-size: 0.875rem;
  color: var(--color-gray-500);
  font-weight: 400;
}

.project-links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.project-link {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 6px;
  font-weight: 500;
  transition: background var(--transition-fast);
}

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

.app-store-badges {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.app-badge {
  display: inline-block;
  transition: opacity var(--transition-fast);
}

.app-badge:hover {
  opacity: 0.8;
}

.app-badge img {
  display: block;
  height: 40px;
  width: auto;
}

.app-badge-android img {
  height: 60px;
}

/* Bili Highlight Box */
.bili-highlight {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
  border-radius: 12px;
  border-left: 4px solid #4caf50;
}

.bili-icon {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
}

.bili-content p {
  margin: 0 0 var(--spacing-sm) 0;
}

.bili-content p:last-child {
  margin-bottom: 0;
}

.btn-bili {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: #1b5e20;  /* Dark green - 6.2:1 contrast ratio (WCAG AA compliant) */
  color: var(--color-white);
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition-fast);
}

.btn-bili:hover {
  background: #0d3d12;
  color: var(--color-white);
  text-decoration: none;
}

@media (max-width: 576px) {
  .bili-highlight {
    flex-direction: column;
    text-align: center;
  }

  .bili-icon {
    width: 60px;
    height: 60px;
  }
}

.page-content,
.project-content,
.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.page-content h2,
.project-content h2,
.post-content h2 {
  margin-top: var(--spacing-2xl);
  color: var(--color-secondary);
}

.page-content ul,
.project-content ul,
.post-content ul {
  padding-left: var(--spacing-xl);
}

.page-content li,
.project-content li,
.post-content li {
  margin-bottom: var(--spacing-sm);
}

/* Post meta */
.post-meta {
  font-size: 0.9rem;
  color: var(--color-gray-500);
}

.category {
  display: inline-block;
  background: var(--color-gray-100);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  margin-left: var(--spacing-sm);
}

/* ============================================
   Projects Index Page
   ============================================ */
.projects-page {
  padding: var(--spacing-2xl) var(--container-padding);
}

.projects-page-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--color-secondary);
  color: var(--color-white);
  padding: var(--spacing-2xl) var(--container-padding);
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.footer-main {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
}

.footer-tagline {
  opacity: 0.8;
  margin-top: var(--spacing-sm);
  margin-bottom: 0;
}

.footer-info p {
  margin: var(--spacing-xs) 0;
  opacity: 0.8;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  padding-top: var(--spacing-lg);
}

.copyright {
  margin: 0;
  opacity: 0.7;
  font-size: 0.9rem;
}

.footer-links a {
  color: var(--color-white);
  opacity: 0.8;
}

.footer-links a:hover {
  opacity: 1;
}

/* ============================================
   Utilities
   ============================================ */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ============================================
   Mobile Responsive Improvements
   ============================================ */
@media (max-width: 576px) {
  /* Increase page padding on mobile */
  .page,
  .project,
  .post {
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
  }

  /* Project meta - single column on mobile */
  .project-meta {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
  }

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

  .meta-item-copi {
    text-align: left;
    justify-self: start;
  }

  /* Smaller title on mobile */
  .project-title {
    font-size: 1.75rem;
  }

  .project-tagline {
    font-size: 1.1rem;
  }

  /* Stack project link buttons vertically */
  .project-links {
    flex-direction: column;
    align-items: stretch;
  }

  .project-link {
    text-align: center;
  }

  /* App store badges */
  .app-store-badges {
    flex-direction: column;
    align-items: center;
  }
}