/* ============================================
   John Engates - Personal Website
   Dark-first design with light mode toggle
   ============================================ */

:root {
  --color-bg: #0a0a0a;
  --color-bg-subtle: #111111;
  --color-bg-card: #161616;
  --color-border: #222222;
  --color-border-hover: #333333;
  --color-text: #e8e8e8;
  --color-text-muted: #888888;
  --color-text-subtle: #555555;
  --color-accent: #4f8ff7;
  --color-accent-dim: rgba(79, 143, 247, 0.1);
  --color-accent-glow: rgba(79, 143, 247, 0.15);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
  --container: 1200px;
  --radius: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html.light {
  --color-bg: #fafafa;
  --color-bg-subtle: #f0f0f0;
  --color-bg-card: #ffffff;
  --color-border: #e0e0e0;
  --color-border-hover: #cccccc;
  --color-text: #1a1a1a;
  --color-text-muted: #555555;
  --color-text-subtle: #999999;
  --color-accent: #2563eb;
  --color-accent-dim: rgba(37, 99, 235, 0.08);
  --color-accent-glow: rgba(37, 99, 235, 0.12);
}

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

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

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

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

/* ---- Navigation ---- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 0;
  transition: background var(--transition), backdrop-filter var(--transition);
}

.nav.scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

html.light .nav.scrolled {
  background: rgba(250, 250, 250, 0.85);
}

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

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}

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

.nav-links {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

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

/* Theme Toggle */

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition);
  width: 36px;
  height: 36px;
}

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

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun { display: none; }

html.light .theme-toggle .icon-moon { display: none; }
html.light .theme-toggle .icon-sun { display: block; }

/* ---- Hero ---- */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 2rem 4rem;
  max-width: var(--container);
  margin: 0 auto;
  position: relative;
}

.hero-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
  margin-bottom: 2rem;
  transition: border-color var(--transition);
}

.hero-photo:hover {
  border-color: var(--color-accent);
}

.hero-label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--color-text-muted);
  max-width: 680px;
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.hero-social {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.social-btn:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  background: var(--color-bg-subtle);
  transform: translateY(-1px);
}

.social-btn svg {
  width: 16px;
  height: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.875rem 2rem;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: all var(--transition);
  letter-spacing: 0.01em;
}

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

.btn-primary:hover {
  background: #3a7ce6;
  transform: translateY(-1px);
}

html.light .btn-primary:hover {
  background: #1d4ed8;
}

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

.btn-outline:hover {
  border-color: var(--color-text-muted);
  background: var(--color-bg-subtle);
}

.hero-scroll {
  position: absolute;
  bottom: 3rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.hero-scroll span {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
  writing-mode: vertical-rl;
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-text-subtle), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ---- Sections ---- */

section {
  padding: 7rem 0;
}

.section-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 4rem;
}

.section-label {
  position: sticky;
  top: 8rem;
  align-self: start;
}

.label-number {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.section-label h2 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* ---- About ---- */

.about {
  border-top: 1px solid var(--color-border);
}

.lead {
  font-size: 1.25rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.section-content p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.section-content .lead {
  color: var(--color-text);
}

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

.section-content a:hover {
  text-decoration: underline;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---- Career Timeline ---- */

.career {
  border-top: 1px solid var(--color-border);
}

.timeline {
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-left: 3rem;
  padding-bottom: 3rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: 0;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  background: var(--color-bg);
  z-index: 1;
  transition: background var(--transition);
}

.timeline-date {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.timeline-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text);
}

.timeline-company {
  font-weight: 500;
  color: var(--color-text-muted) !important;
  margin-bottom: 0.75rem !important;
  font-size: 1rem;
}

.timeline-content p:last-child {
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---- Expertise ---- */

.expertise {
  border-top: 1px solid var(--color-border);
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.expertise-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
}

.expertise-card:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-subtle);
  transform: translateY(-2px);
}

.expertise-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 1.25rem;
  color: var(--color-accent);
}

.expertise-icon svg {
  width: 100%;
  height: 100%;
}

.expertise-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.expertise-card p {
  font-size: 0.9rem;
}

/* ---- Highlight Quote ---- */

.highlight {
  background: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
  padding: 6rem 0;
}

.highlight-quote {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 400;
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
  color: var(--color-text);
  font-style: italic;
  border: none;
}

.highlight-attribution {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ---- Boards ---- */

.boards {
  border-top: 1px solid var(--color-border);
}

.board-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.board-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
}

.board-card:hover {
  border-color: var(--color-border-hover);
}

.board-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text);
}

.board-ticker {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  margin-bottom: 1rem !important;
}

.board-other {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.board-other h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

/* ---- Writing ---- */

.writing {
  border-top: 1px solid var(--color-border);
}

.writing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.writing-card {
  display: block;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  text-decoration: none;
  transition: all var(--transition);
}

.writing-card:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
  transform: translateY(-2px);
}

.writing-source {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.writing-card h3 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.writing-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.writing-card:hover .writing-link {
  color: var(--color-accent);
}

/* ---- Education ---- */

.education {
  border-top: 1px solid var(--color-border);
}

.education-item h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.education-school {
  font-size: 1rem;
  color: var(--color-text-muted) !important;
}

/* ---- Contact ---- */

.contact {
  border-top: 1px solid var(--color-border);
}

.contact-inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-inner h2 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.contact-inner > p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 2.5rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.75rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: all var(--transition);
}

.contact-link:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
  transform: translateY(-2px);
}

.contact-link svg {
  width: 20px;
  height: 20px;
}

.contact-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.contact-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  background: none;
  cursor: pointer;
  transition: all var(--transition);
}

.contact-action-btn:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

.contact-action-btn svg {
  width: 16px;
  height: 16px;
}

/* ---- Footer ---- */

.footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  text-align: center;
}

.footer p {
  font-size: 0.85rem;
  color: var(--color-text-subtle);
}

.footer a {
  color: var(--color-text-subtle);
  text-decoration: none;
  transition: color var(--transition);
}

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

/* ---- Speaker Bio Modal ---- */

.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  z-index: 200;
  animation: fadeInOverlay 0.2s ease-out;
}

html.light .modal-overlay {
  background: rgba(0, 0, 0, 0.4);
}

.modal-overlay.open {
  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes fadeInOverlay {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-content {
  position: relative;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 90%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideInModal 0.3s ease-out;
}

@keyframes slideInModal {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0.25rem;
  transition: color var(--transition);
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-close svg {
  width: 24px;
  height: 24px;
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.modal-body {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

.modal-body p {
  margin-bottom: 1rem;
}

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

.modal-body strong {
  color: var(--color-text);
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
}

.modal-btn {
  flex: 1;
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-subtle);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
}

.modal-btn:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
}

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

.modal-btn-primary:hover {
  background: #3a7ce6;
}

html.light .modal-btn-primary:hover {
  background: #1d4ed8;
}

/* ---- Responsive ---- */

@media (max-width: 900px) {
  .section-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .section-label {
    position: static;
  }

  .expertise-grid,
  .board-cards,
  .writing-grid {
    grid-template-columns: 1fr;
  }

  .stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    padding: 1.5rem 2rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-border);
  }

  html.light .nav-links {
    background: rgba(250, 250, 250, 0.95);
  }

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

  .nav-right {
    gap: 0.75rem;
  }

  .hero {
    padding: 6rem 1.5rem 3rem;
  }

  .hero-scroll {
    display: none;
  }

  .container {
    padding: 0 1.5rem;
  }

  .stats {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .stat {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
  }

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

  .contact-link {
    width: 100%;
    justify-content: center;
  }

  .modal-content {
    padding: 1.5rem;
    margin: 1rem;
  }

  .modal-actions {
    flex-direction: column;
  }
}

/* ---- Animations ---- */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}