/* ============================================================
   Collin Lucken — Academic Website
   Design: Dark, geometric, restrained neon. Distill.pub meets PWNK.
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  --color-accent: #00d4aa;
  --color-accent-dim: #00a88a;
  --color-accent-glow: rgba(0, 212, 170, 0.15);
  --color-accent-secondary: #7b61ff;
  --color-text: #e0ddd5;
  --color-text-secondary: #a8a49a;
  --color-text-muted: #6b6860;
  --color-bg: #0c0c0c;
  --color-bg-alt: #141414;
  --color-bg-card: #1a1a1a;
  --color-bg-card-hover: #1f1f1f;
  --color-border: #2a2a2a;
  --color-border-light: #222222;
  --color-link: #00d4aa;
  --color-link-hover: #7b61ff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(0, 212, 170, 0.08);
  --font-heading: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
  --max-width: 900px;
  --transition: 0.2s ease;
}

/* --- Light Mode Override --- */
[data-theme="light"] {
  --color-accent: #0a8f6f;
  --color-accent-dim: #078060;
  --color-accent-glow: rgba(10, 143, 111, 0.08);
  --color-accent-secondary: #5b45cc;
  --color-text: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-muted: #888888;
  --color-bg: #f8f7f4;
  --color-bg-alt: #efeeeb;
  --color-bg-card: #ffffff;
  --color-bg-card-hover: #fafaf8;
  --color-border: #dddbd6;
  --color-border-light: #e8e6e1;
  --color-link: #0a8f6f;
  --color-link-hover: #5b45cc;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-glow: 0 0 20px rgba(10, 143, 111, 0.06);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-text);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.4rem;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.5rem;
  margin-top: 3rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

h2::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 1.2em;
  background-color: var(--color-accent);
  border-radius: 2px;
  flex-shrink: 0;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  max-width: 68ch;
}

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

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

em {
  font-style: italic;
  color: var(--color-text);
}

strong {
  font-weight: 600;
  color: var(--color-text);
}

code, .mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* --- Header & Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(12, 12, 12, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color 0.3s ease;
}

[data-theme="light"] .site-header {
  background-color: rgba(248, 247, 244, 0.85);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.01em;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: lowercase;
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--transition);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

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

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
  padding: 0.3rem 0.5rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  line-height: 1;
}

.theme-toggle:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Mobile nav */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
}

.nav-hamburger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background-color: var(--color-text-secondary);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-hamburger.open span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.nav-hamburger.open span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.open span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

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

  .nav-links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-bg-alt);
    flex-direction: column;
    gap: 0;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    z-index: 99;
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 0.65rem 2rem;
    font-size: 0.85rem;
  }

  .nav-links a::after {
    display: none;
  }
}

/* --- Main Content --- */
main {
  padding: 3.5rem 0 5rem;
  min-height: calc(100vh - 56px - 100px);
}

/* --- Home Page: Hero Section --- */
.hero {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 2.5rem;
  align-items: start;
  margin-bottom: 3rem;
}

.hero-photo {
  width: 180px;
  height: 220px;
  border-radius: 4px;
  object-fit: cover;
  object-position: center top;
  border: 1px solid var(--color-border);
  filter: grayscale(20%);
  transition: filter 0.4s ease;
}

.hero-photo:hover {
  filter: grayscale(0%);
}

.hero-photo-placeholder {
  width: 180px;
  height: 220px;
  border-radius: 4px;
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.hero-content h1 {
  margin-bottom: 0.3rem;
}

.hero-subtitle {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--color-accent);
  margin-bottom: 0.15rem;
  font-style: normal;
}

.hero-affiliation {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.hero-statement {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
  max-width: 56ch;
}

@media (max-width: 640px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 1.5rem;
  }

  .hero-photo,
  .hero-photo-placeholder {
    margin: 0 auto;
    width: 140px;
    height: 170px;
  }

  .hero-statement {
    max-width: 100%;
    text-align: left;
  }
}

/* --- Contact Links --- */
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
  margin-bottom: 2.5rem;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-muted);
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  transition: all var(--transition);
}

.contact-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.contact-link svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

/* --- Section Divider --- */
.section-divider {
  border: none;
  border-top: 1px solid var(--color-border-light);
  margin: 3rem 0;
}

/* --- Visualization Container --- */
#research-viz {
  width: 100%;
  height: 320px;
  margin: 2rem 0;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background-color: var(--color-bg-alt);
  overflow: hidden;
}

/* --- News Section --- */
.news-list {
  list-style: none;
}

.news-item {
  display: flex;
  gap: 1.25rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 0.9rem;
}

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

.news-date {
  flex-shrink: 0;
  width: 70px;
  color: var(--color-text-muted);
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

.news-text {
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* --- Research Page --- */
.research-overview {
  margin-bottom: 2.5rem;
  max-width: 68ch;
}

.research-overview p {
  color: var(--color-text-secondary);
}

.research-area {
  margin-bottom: 1.5rem;
  padding: 1.5rem 1.75rem;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: all var(--transition);
  position: relative;
}

.research-area::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background-color: var(--color-accent);
  border-radius: 4px 0 0 4px;
  opacity: 0;
  transition: opacity var(--transition);
}

.research-area:hover {
  background-color: var(--color-bg-card-hover);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.research-area:hover::before {
  opacity: 1;
}

.research-area-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.4rem;
}

.research-area h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-text);
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.research-area p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 0.5rem;
}

.research-area p:last-child {
  margin-bottom: 0;
}

/* --- Publications --- */
.pub-section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-accent);
  display: inline-block;
}

.publication {
  margin-bottom: 1.25rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--color-border-light);
  border-radius: 4px;
  background-color: var(--color-bg-card);
  transition: all var(--transition);
}

.publication:hover {
  border-color: var(--color-border);
  background-color: var(--color-bg-card-hover);
}

.pub-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 0.3rem;
  line-height: 1.4;
}

.pub-authors {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 0.15rem;
}

.pub-venue {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: 0.5rem;
}

.pub-status {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 3px;
  margin-bottom: 0.4rem;
}

.pub-status.published {
  background-color: rgba(0, 212, 170, 0.12);
  color: var(--color-accent);
  border: 1px solid rgba(0, 212, 170, 0.25);
}

.pub-status.under-review {
  background-color: rgba(123, 97, 255, 0.1);
  color: var(--color-accent-secondary);
  border: 1px solid rgba(123, 97, 255, 0.2);
}

.pub-status.in-progress {
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

[data-theme="light"] .pub-status.published {
  background-color: rgba(10, 143, 111, 0.08);
  color: var(--color-accent);
  border: 1px solid rgba(10, 143, 111, 0.2);
}

[data-theme="light"] .pub-status.under-review {
  background-color: rgba(91, 69, 204, 0.06);
  color: var(--color-accent-secondary);
  border: 1px solid rgba(91, 69, 204, 0.15);
}

[data-theme="light"] .pub-status.in-progress {
  background-color: rgba(0, 0, 0, 0.03);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.pub-abstract-toggle {
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  cursor: pointer;
  padding: 0;
  transition: color var(--transition);
}

.pub-abstract-toggle:hover {
  color: var(--color-link-hover);
}

.pub-abstract {
  display: none;
  margin-top: 0.75rem;
  padding: 1rem;
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border-light);
  border-radius: 3px;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
  max-width: 65ch;
}

.pub-abstract.open {
  display: block;
}

.pub-links {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.pub-link {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

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

/* --- Teaching Page --- */
.teaching-philosophy {
  margin-bottom: 2.5rem;
  max-width: 65ch;
}

.teaching-philosophy p {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
}

.course-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (max-width: 640px) {
  .course-grid {
    grid-template-columns: 1fr;
  }
}

.course-card {
  padding: 1.25rem 1.5rem;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: all var(--transition);
}

.course-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.course-card h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--color-text);
  margin-top: 0;
  margin-bottom: 0.2rem;
}

.course-level {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.6rem;
}

.course-card p {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

.assignment-highlight {
  margin-top: 0.75rem;
  padding: 0.6rem 0.85rem;
  background-color: var(--color-accent-glow);
  border-left: 2px solid var(--color-accent);
  border-radius: 0 3px 3px 0;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  font-style: italic;
}

/* --- CV Page --- */
.cv-actions {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #0c0c0c;
  border: 1px solid var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-dim);
  border-color: var(--color-accent-dim);
  color: #0c0c0c;
  box-shadow: var(--shadow-glow);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.cv-embed {
  width: 100%;
  height: 80vh;
  min-height: 600px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background-color: var(--color-bg-card);
}

/* --- Footer --- */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border-light);
  text-align: center;
}

.footer-content {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 0.75rem;
}

.footer-links a {
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

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

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

.text-muted {
  color: var(--color-text-muted);
}

.text-small {
  font-size: 0.85rem;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* --- Fade-in Animation --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero,
.research-area,
.publication,
.course-card {
  animation: fadeInUp 0.5s ease both;
}

.research-area:nth-child(2) { animation-delay: 0.08s; }
.research-area:nth-child(3) { animation-delay: 0.16s; }
.publication:nth-child(odd) { animation-delay: 0.04s; }
.course-card:nth-child(2) { animation-delay: 0.06s; }
.course-card:nth-child(3) { animation-delay: 0.12s; }
.course-card:nth-child(4) { animation-delay: 0.18s; }

/* --- Print Styles --- */
@media print {
  .site-header,
  .theme-toggle,
  .nav-hamburger,
  .site-footer,
  #research-viz {
    display: none;
  }

  main {
    padding: 0;
  }

  body {
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}