/* ============================================
   Brandon B. May — Personal Homepage
   ============================================ */

:root {
  /* Light Mode */
  --color-bg: #fafafa;
  --color-bg-elevated: #ffffff;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #4a4a65;
  --color-text-muted: #7a7a95;
  --color-accent: #0d9488;
  --color-accent-hover: #0f766e;
  --color-accent-subtle: rgba(0, 0, 0, 0.04);
  --color-border: #e2e4e9;
  --color-card-shadow: rgba(0, 0, 0, 0.06);
  --color-card-shadow-hover: rgba(0, 0, 0, 0.12);
  --color-nav-bg: rgba(250, 250, 250, 0.85);
  --color-tag-bg: #e6f7f5;
  --color-tag-text: #0d9488;
  --color-footer-bg: #f0f2f5;
  --color-award-bg: #fef3c7;
  --color-award-text: #92400e;

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

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.8125rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --line-height: 1.65;

  /* Layout */
  --max-width: 860px;
  --nav-height: 60px;
  --border-radius: 10px;
  --border-radius-sm: 6px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

[data-theme="dark"] {
  --color-bg: #1a1a1a;
  --color-bg-elevated: #242424;
  --color-surface: #2a2a2a;
  --color-text: #e8e4df;
  --color-text-secondary: #b0aaa2;
  --color-text-muted: #787068;
  --color-accent: #2dd4bf;
  --color-accent-hover: #5eead4;
  --color-accent-subtle: rgba(255, 255, 255, 0.05);
  --color-border: #333333;
  --color-card-shadow: rgba(0, 0, 0, 0.3);
  --color-card-shadow-hover: rgba(0, 0, 0, 0.5);
  --color-nav-bg: rgba(26, 26, 26, 0.9);
  --color-tag-bg: #142825;
  --color-tag-text: #2dd4bf;
  --color-footer-bg: #141414;
  --color-award-bg: #2a2018;
  --color-award-text: #fbbf24;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + var(--space-lg));
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-slow),
              color var(--transition-slow);
}

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

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

ul { list-style: none; }

/* --- Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
  transition: background-color var(--transition-slow),
              border-color var(--transition-slow);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  color: var(--color-text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  transition: border-color var(--transition-fast),
              color var(--transition-fast);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

#theme-toggle {
  background: none;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: border-color var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast);
}

#theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: rotate(15deg);
}

[data-theme="dark"] .icon-sun { display: inline; }
[data-theme="dark"] .icon-moon { display: none; }
:root:not([data-theme="dark"]) .icon-moon { display: inline; }
:root:not([data-theme="dark"]) .icon-sun { display: none; }

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

.section {
  padding: var(--space-xl) 0;
}


.section h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-xl);
  color: var(--color-text);
  transition: color var(--transition-slow);
}

/* --- Hero --- */
.hero {
  padding: var(--space-xl) 0 0;
  position: relative;
  overflow: hidden;
}

#hero-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.7;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  position: relative;
  z-index: 1;
}

.hero-text { flex: 1; }

.hero-text h1 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: var(--space-sm);
  transition: color var(--transition-slow);
}

.hero-title {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
  margin-left: calc(-1 * var(--space-md));
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: color-mix(in srgb, var(--color-bg) 70%, transparent);
  backdrop-filter: blur(1px);
  border-radius: var(--radius-full);
  transition: color var(--transition-slow),
              background var(--transition-slow);
}

.hero-org {
  font-size: var(--font-size-lg);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: color var(--transition-slow);
}

.hero-org-logo {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-border);
  background: var(--color-bg-elevated);
  transition: border-color var(--transition-slow);
}

.hero-focus {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  margin-left: calc(-1 * var(--space-md));
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: color-mix(in srgb, var(--color-bg) 70%, transparent);
  backdrop-filter: blur(1px);
  border-radius: var(--radius-full);
  transition: color var(--transition-slow),
              background var(--transition-slow);
}

.hero-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: color-mix(in srgb, var(--color-bg-elevated) 70%, transparent);
  backdrop-filter: blur(1px);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.hero-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.hero-links a svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

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

.hero-photo img {
  width: 210px;
  height: 210px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 20%;
  border: 3px solid var(--color-border);
  box-shadow: 0 4px 20px var(--color-card-shadow);
  transition: border-color var(--transition-slow),
              box-shadow var(--transition-slow);
}

/* --- About Card --- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  box-shadow: 0 1px 3px var(--color-card-shadow);
  transition: background-color var(--transition-slow),
              border-color var(--transition-slow),
              box-shadow var(--transition-slow);
}

.card p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
  transition: color var(--transition-slow);
}

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

.card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  transition: color var(--transition-slow);
}

.card ul {
  padding-left: var(--space-lg);
  list-style: disc;
}

.card li {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
  transition: color var(--transition-slow);
}

/* --- Publication Cards --- */
.pub-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-lg);
  box-shadow: 0 1px 3px var(--color-card-shadow);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.pub-card:hover {
  box-shadow: 0 4px 16px var(--color-card-shadow-hover);
  transform: translateY(-2px);
}

.pub-card:last-child { margin-bottom: 0; }

.pub-summary {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg);
  cursor: pointer;
  user-select: none;
  transition: background-color var(--transition-fast);
}

.pub-summary:hover {
  background: var(--color-accent-subtle);
}

.pub-summary:hover .pub-expand-icon {
  color: var(--color-accent);
  transform: scale(1.15);
}

.pub-thumb {
  flex-shrink: 0;
  width: 180px;
  height: 130px;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  background: var(--color-tag-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-slow);
}

.pub-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
}

.pub-thumb-placeholder {
  font-weight: 700;
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  opacity: 0.6;
  text-align: center;
  line-height: 1.3;
  padding: var(--space-sm);
}

.pub-content { flex: 1; min-width: 0; }

.pub-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-sm);
}

.pub-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
  transition: color var(--transition-slow);
  line-height: 1.4;
}

.pub-expand-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  transition: transform var(--transition-normal), color var(--transition-slow);
  margin-top: 2px;
}

.pub-card.expanded .pub-expand-icon {
  transform: rotate(180deg);
}

.pub-authors {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
  transition: color var(--transition-slow);
  line-height: 1.5;
}

.pub-authors .me {
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition-slow);
}

.pub-venue {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  transition: color var(--transition-slow);
}

.venue-badge {
  display: inline-block;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 1px 7px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-left: var(--space-xs);
  transition: background-color var(--transition-slow),
              color var(--transition-slow);
}

.venue-badge-award {
  background: var(--color-award-bg);
  color: var(--color-award-text);
}

.pub-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.pub-link {
  font-size: var(--font-size-xs);
  color: var(--color-accent);
  text-decoration: none;
  padding: 2px 10px;
  border: 1px solid var(--color-accent);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.pub-link:hover {
  background: var(--color-accent);
  color: var(--color-bg-elevated);
}

.pub-link svg {
  width: 12px;
  height: 12px;
}

/* Expandable details */
.pub-details {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.pub-card.expanded .pub-details {
  max-height: 500px;
}

.pub-details-inner {
  padding: 0 var(--space-lg) var(--space-lg);
  border-top: 1px solid var(--color-border);
  margin-top: 0;
  padding-top: var(--space-md);
  transition: border-color var(--transition-slow);
}

.pub-abstract {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  transition: color var(--transition-slow);
}

.pub-abstract strong {
  color: var(--color-text);
  font-weight: 600;
  transition: color var(--transition-slow);
}

/* --- Experience Timeline --- */
.timeline {
  position: relative;
}

.timeline-entry {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  position: relative;
}

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

.timeline-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-xs);
  letter-spacing: -0.02em;
  color: #fff;
  position: relative;
  margin-top: 2px;
  box-shadow: 0 2px 8px var(--color-card-shadow);
  transition: box-shadow var(--transition-slow);
}

.timeline-icon img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.timeline-icon.motional { background: var(--color-bg-elevated); }
.timeline-icon.rai { background: var(--color-bg-elevated); }
.timeline-icon.str { background: var(--color-bg-elevated); }
.timeline-icon.mitre { background: var(--color-bg-elevated); }
.timeline-icon.rit { background: var(--color-bg-elevated); }
.timeline-icon.skidmore { background: #006341; }

.timeline-entry.current .timeline-icon {
  box-shadow: 0 2px 8px var(--color-card-shadow), 0 0 0 3px var(--color-accent-subtle);
}

/* Connecting line between icons */
.timeline-entry:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 24px;
  top: 52px;
  bottom: calc(-1 * var(--space-xl));
  width: 2px;
  transform: translateX(-50%);
  background: var(--color-border);
  transition: background-color var(--transition-slow);
}

.timeline-body {
  flex: 1;
  min-width: 0;
}

.timeline-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-xs);
}

.timeline-company {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  transition: color var(--transition-slow);
}

.timeline-company a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.timeline-dates {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  transition: color var(--transition-slow);
}

.timeline-role {
  font-size: var(--font-size-base);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  transition: color var(--transition-slow);
}

.timeline-location {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  transition: color var(--transition-slow);
}

.timeline-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  transition: color var(--transition-slow);
}

.timeline-subrole + .timeline-subrole {
  padding-top: var(--space-md);
  margin-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  transition: border-color var(--transition-slow);
}

.timeline-subrole .timeline-dates {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.timeline-tag {
  font-size: 0.6875rem;
  padding: 1px 8px;
  border-radius: 3px;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  font-weight: 500;
  transition: background-color var(--transition-slow),
              color var(--transition-slow);
}

/* --- Contact Section --- */
.contact-section {
  text-align: center;
}

.contact-section .hero-links a {
  background: var(--color-bg-elevated);
  backdrop-filter: none;
}

.contact-section p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  transition: color var(--transition-slow);
}

/* --- Footer --- */
.site-footer {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  background: var(--color-footer-bg);
  transition: background-color var(--transition-slow),
              border-color var(--transition-slow),
              color var(--transition-slow);
}

/* --- Reading Progress Bar --- */
.progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--color-accent);
  transition: background-color var(--transition-slow);
}

/* --- Active Nav Link --- */
.nav-links a.active {
  color: var(--color-accent);
}

/* --- Scroll Reveal --- */
.scroll-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .scroll-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* --- Responsive: Tablet --- */
@media (max-width: 768px) {
  :root {
    --font-size-3xl: 2rem;
  }

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

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

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

  .hero-photo img {
    width: 160px;
    height: 160px;
  }

  .nav-links { gap: var(--space-md); }

  .pub-summary {
    flex-direction: column;
  }

  .pub-thumb {
    width: 100%;
    height: 140px;
  }

  .timeline-header {
    flex-direction: column;
    gap: 0;
  }

  .timeline-icon {
    width: 40px;
    height: 40px;
    font-size: 0.6875rem;
  }
}

/* --- Responsive: Mobile --- */
@media (max-width: 480px) {
  .container { padding: 0 var(--space-md); }
  .nav-container { padding: 0 var(--space-md); }

  .nav-links a { font-size: var(--font-size-xs); }

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

  .pub-thumb { height: 110px; }

  .pub-links { flex-wrap: wrap; }
}