/* ============================================
   Christian Rogers - Portfolio Styles
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* Custom Properties */
:root {
  --color-primary: #0f172a;
  --color-primary-light: #1e293b;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #dbeafe;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-subtle: #f1f5f9;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-tertiary: #94a3b8;
  --color-border: #e2e8f0;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1100px;
  --nav-height: 72px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --transition: 150ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

h1, h2, h3, h4 {
  color: var(--color-primary);
  line-height: 1.3;
  font-weight: 700;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.25rem; }

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

.nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-brand:hover {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
}

.nav-links a {
  display: inline-block;
  padding: 8px 16px;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: 6px;
  transition: all var(--transition);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
  background-color: var(--color-accent-light);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  padding: 80px 0 64px;
  background: linear-gradient(160deg, var(--color-bg) 0%, var(--color-bg-alt) 40%, var(--color-accent-light) 100%);
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 64px;
}

.hero-content {
  flex: 1;
}

.hero-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.1875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 540px;
}

.hero-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 8px;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff !important;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text) !important;
  background: var(--color-bg);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.hero-photo {
  flex-shrink: 0;
}

.hero-photo img {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-bg);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 80px 0;
}

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

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  margin-bottom: 12px;
}

.section-header p {
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Research Cards
   ============================================ */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.research-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
}

.research-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.research-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}

.research-card h3 {
  margin-bottom: 8px;
}

.research-card .lab-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.research-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.research-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-subtle);
  padding: 4px 10px;
  border-radius: 4px;
}

/* ============================================
   Publications
   ============================================ */
.publication-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
}

.publication-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  transition: all var(--transition);
}

.publication-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.publication-year {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.publication-item h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
  line-height: 1.4;
}

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

.publication-item h3 a:hover {
  color: var(--color-accent);
}

.publication-authors {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.publication-venue {
  font-size: 0.875rem;
  font-style: italic;
  color: var(--color-text-tertiary);
}

.publication-links {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.publication-links a {
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 4px;
  background: var(--color-bg-subtle);
  color: var(--color-accent);
  transition: all var(--transition);
}

.publication-links a:hover {
  background: var(--color-accent-light);
}

/* ============================================
   Publication Detail Page
   ============================================ */
.pub-detail {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
}

.pub-detail .back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.pub-detail .back-link:hover {
  color: var(--color-accent);
}

.pub-detail h1 {
  font-size: 2rem;
  margin-bottom: 16px;
  line-height: 1.3;
}

.pub-detail .pub-meta {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.pub-detail .pub-authors {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.pub-detail .pub-venue {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  font-style: italic;
}

.pub-detail h2 {
  font-size: 1.375rem;
  margin-top: 40px;
  margin-bottom: 16px;
}

.pub-detail p,
.pub-detail ul {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.8;
}

.pub-detail ul {
  padding-left: 24px;
  margin-bottom: 1rem;
}

.pub-detail ul li {
  margin-bottom: 6px;
}

/* ============================================
   CV Page
   ============================================ */
.cv-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
}

.cv-header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.cv-header h1 {
  font-size: 2.25rem;
  margin-bottom: 8px;
}

.cv-subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.cv-section {
  margin-bottom: 48px;
}

.cv-section h2 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  margin-bottom: 24px;
}

.cv-entry {
  margin-bottom: 28px;
}

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

.cv-entry-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 4px;
  flex-wrap: wrap;
  gap: 8px;
}

.cv-entry-title {
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--color-primary);
}

.cv-entry-date {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  font-weight: 500;
  white-space: nowrap;
}

.cv-entry-org {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  font-style: italic;
  margin-bottom: 8px;
}

.cv-entry p,
.cv-entry ul {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.cv-entry ul {
  padding-left: 20px;
}

.cv-entry ul li {
  margin-bottom: 4px;
}

.cv-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.cv-skill {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-bg-subtle);
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
}

/* ============================================
   Projects
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}

.project-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.project-card h3 {
  margin-bottom: 12px;
}

.project-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.project-status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.status-wip {
  background: #fef3c7;
  color: #92400e;
}

.status-active {
  background: #d1fae5;
  color: #065f46;
}

/* ============================================
   Contact
   ============================================ */
.contact-grid {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
  text-decoration: none;
  color: var(--color-text);
}

.contact-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-text);
}

.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon svg {
  width: 20px;
  height: 20px;
  fill: var(--color-accent);
}

.contact-label {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  font-weight: 500;
}

.contact-value {
  font-size: 0.9375rem;
  color: var(--color-text);
  font-weight: 600;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.6);
  padding: 40px 0;
  text-align: center;
  font-size: 0.875rem;
}

.footer a {
  color: rgba(255, 255, 255, 0.8);
}

.footer a:hover {
  color: #fff;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 16px;
}

/* ============================================
   Page Header (for inner pages)
   ============================================ */
.page-header {
  background: var(--color-bg-alt);
  padding: 48px 0;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 2.25rem;
  margin-bottom: 8px;
}

.page-header p {
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  max-width: 600px;
}

/* ============================================
   Projects Listing Page
   ============================================ */
.projects-category {
  margin-bottom: 56px;
}

.projects-category-title {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  margin-bottom: 24px;
}

.projects-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.project-list-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition);
}

.project-list-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-text);
}

.project-list-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
}

.project-list-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.35;
  flex: 1;
}

.project-list-card:hover .project-list-card-title {
  color: var(--color-accent);
}

.project-list-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.project-period {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  font-weight: 500;
  white-space: nowrap;
}

.project-list-card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

.project-list-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-list-card-arrow {
  margin-top: 14px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ============================================
   Project Detail Page
   ============================================ */
.project-detail {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
}

.project-detail .back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  text-decoration: none;
  transition: color var(--transition);
}

.project-detail .back-link:hover {
  color: var(--color-accent);
}

.project-detail-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.project-detail-header .project-period {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  font-weight: 500;
  margin-bottom: 10px;
}

.project-detail-header h1 {
  font-size: 2rem;
  line-height: 1.25;
  margin-bottom: 14px;
  margin-top: 8px;
}

.project-detail-header .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-detail h2 {
  font-size: 1.375rem;
  margin-top: 40px;
  margin-bottom: 14px;
}

.project-detail p,
.project-detail ul {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.8;
}

.project-detail ul {
  padding-left: 24px;
  margin-bottom: 1rem;
}

.project-detail ul li {
  margin-bottom: 6px;
}

.playground-placeholder {
  margin-top: 56px;
  padding: 40px 32px;
  background: var(--color-bg-alt);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
}

.playground-placeholder-icon {
  font-size: 2rem;
  margin-bottom: 12px;
  color: var(--color-text-tertiary);
}

.playground-placeholder h3 {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.playground-placeholder p {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
}

/* ============================================
   Blog Page
   ============================================ */
.blog-list {
  max-width: 800px;
  margin: 0 auto;
}

.blog-coming-soon {
  text-align: center;
  padding: 80px 32px;
  background: var(--color-bg-alt);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
}

.blog-coming-soon-icon {
  font-size: 3rem;
  margin-bottom: 20px;
  color: var(--color-text-tertiary);
}

.blog-coming-soon h3 {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.blog-coming-soon p {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

.blog-post-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 16px;
  transition: all var(--transition);
  text-decoration: none;
  display: block;
  color: var(--color-text);
}

.blog-post-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-text);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    box-shadow: var(--shadow-lg);
  }

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

  .nav-toggle {
    display: block;
  }

  .nav .container {
    position: relative;
  }

  .hero .container {
    flex-direction: column-reverse;
    text-align: center;
    gap: 32px;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

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

  .hero-photo img {
    width: 200px;
    height: 200px;
  }

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

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

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

  .section {
    padding: 48px 0;
  }

  .hero {
    padding: 48px 0 40px;
  }

  .cv-entry-header {
    flex-direction: column;
    gap: 2px;
  }

  .contact-grid {
    flex-direction: column;
    align-items: center;
  }

  .page-header {
    padding: 32px 0;
  }

  .pub-detail {
    padding: 40px 24px;
  }

  .cv-page {
    padding: 40px 24px;
  }

  .project-detail {
    padding: 40px 24px;
  }

  .project-list-card {
    padding: 20px;
  }

  .project-list-card-top {
    flex-direction: column;
    gap: 8px;
  }

  .project-list-card-meta {
    flex-direction: row;
    gap: 10px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.875rem;
  }

  .hero-links {
    flex-direction: column;
    align-items: center;
  }

  .hero-links a {
    width: 100%;
    justify-content: center;
  }

  .publication-item {
    padding: 20px;
  }
}