/* ============================================
   DAVID WESSELS — Personal Website
   A clean, cinematic design
   ============================================ */

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

:root {
  --bg: #0a0a0b;
  --bg-elevated: #111113;
  --bg-card: #161618;
  --text: #e8e8ed;
  --text-muted: #8a8a96;
  --text-dim: #55555f;
  --accent: #6c63ff;
  --accent-glow: rgba(108, 99, 255, 0.15);
  --accent-secondary: #00d4aa;
  --gradient-1: linear-gradient(135deg, #6c63ff 0%, #00d4aa 100%);
  --gradient-2: linear-gradient(135deg, #6c63ff 0%, #e040fb 50%, #00d4aa 100%);
  --border: rgba(255, 255, 255, 0.06);
  --radius: 16px;
  --radius-sm: 8px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

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

::selection {
  background: var(--accent);
  color: #fff;
}

/* --- Cursor Glow --- */
.cursor-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.4s ease;
  mix-blend-mode: screen;
}

body:hover .cursor-glow {
  opacity: 1;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 40px;
  transition: var(--transition-slow);
}

.nav.scrolled {
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  padding: 14px 40px;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--gradient-1);
  transition: width var(--transition);
}

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

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

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#heroCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 24px;
}

.hero-greeting {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.hero-line {
  display: block;
  width: 40px;
  height: 1px;
  background: var(--accent);
}

.hero-greeting-text {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(3.5rem, 10vw, 8rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-name-accent {
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-tagline {
  font-size: 1.125rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 40px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background: var(--gradient-1);
  color: #fff;
  box-shadow: 0 4px 24px rgba(108, 99, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(108, 99, 255, 0.4);
}

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

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
}

/* Scroll indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

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

@keyframes scrollPulse {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.3; transform: scaleY(0.6); }
}

/* --- Sections (shared) --- */
.section {
  padding: 120px 0;
  position: relative;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-title em {
  font-style: italic;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 48px;
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 80px;
  align-items: center;
}

.about-image-wrapper {
  position: relative;
  aspect-ratio: 1;
  max-width: 380px;
}

.about-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  position: relative;
  z-index: 1;
  filter: grayscale(20%) contrast(1.05);
  transition: filter var(--transition-slow);
}

.about-image-wrapper:hover .about-image {
  filter: grayscale(0%) contrast(1);
}

.about-image-frame {
  position: absolute;
  inset: -8px;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--border);
  z-index: 0;
  transition: var(--transition-slow);
}

.about-image-wrapper:hover .about-image-frame {
  border-color: var(--accent);
  box-shadow: 0 0 40px var(--accent-glow);
}

/* Easter egg: glitch effect on photo hover */
.about-image-glitch {
  position: absolute;
  inset: 0;
  z-index: 2;
  opacity: 0;
  pointer-events: none;
  border-radius: var(--radius);
  overflow: hidden;
}

.about-image-glitch .about-image {
  filter: hue-rotate(90deg) saturate(2);
}

.about-image-wrapper:hover .about-image-glitch {
  animation: glitch 0.3s steps(2) 0.5s 1;
}

@keyframes glitch {
  0% { opacity: 0; transform: translate(0); }
  20% { opacity: 0.8; transform: translate(-5px, 3px); }
  40% { opacity: 0; transform: translate(5px, -3px); }
  60% { opacity: 0.6; transform: translate(-3px, -2px); }
  80% { opacity: 0; transform: translate(3px, 2px); }
  100% { opacity: 0; transform: translate(0); }
}

.about-bio {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 40px;
}

.about-stats {
  display: flex;
  gap: 48px;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 2rem;
  font-weight: 600;
  font-family: var(--font-serif);
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-top: 4px;
}

/* --- Papers Section --- */
.papers {
  background: var(--bg-elevated);
}

.papers-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.paper-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  position: relative;
}

.paper-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-1);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.paper-card:hover {
  border-color: rgba(108, 99, 255, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.paper-card:hover::before {
  transform: scaleX(1);
}

.paper-card-inner {
  padding: 32px 36px;
}

.paper-year {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.paper-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  margin: 8px 0 12px;
  line-height: 1.3;
}

.paper-authors {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.paper-venue {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-style: italic;
  margin-top: 4px;
}

.paper-links {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.paper-link {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: var(--transition);
}

.paper-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

/* --- Notes Section --- */
.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.note-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.note-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--bg-card), transparent);
  pointer-events: none;
}

.note-card:hover {
  border-color: rgba(0, 212, 170, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.note-date {
  font-size: 0.75rem;
  color: var(--accent-secondary);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.note-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin: 12px 0 16px;
  line-height: 1.3;
}

.note-excerpt {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.note-read-more {
  display: inline-block;
  margin-top: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-secondary);
  transition: var(--transition);
  position: relative;
  z-index: 1;
}

.note-read-more:hover {
  color: #fff;
}

/* --- Marquee Ribbon --- */
.marquee-ribbon {
  padding: 20px 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 30s linear infinite;
}

.marquee-track span {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0 20px;
  white-space: nowrap;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* --- Footer --- */
.footer {
  padding: 100px 0 40px;
  text-align: center;
}

.footer-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-text {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 36px;
}

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

.footer-link {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 12px 28px;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-muted);
  transition: var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-easter-egg {
  cursor: help;
  transition: var(--transition);
}

.footer-easter-egg:hover {
  color: var(--accent);
}

/* --- Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }

.reveal-slide-right {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-slide-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* --- Konami Easter Egg Overlay --- */
.konami-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 11, 0.95);
  backdrop-filter: blur(20px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}

.konami-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.konami-content {
  text-align: center;
}

.konami-emoji {
  font-size: 4rem;
  margin-bottom: 24px;
  animation: konamiBounce 0.6s ease infinite alternate;
}

@keyframes konamiBounce {
  from { transform: translateY(0); }
  to { transform: translateY(-10px); }
}

.konami-content h2 {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin-bottom: 12px;
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.konami-content p {
  color: var(--text-muted);
  margin-bottom: 32px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav {
    padding: 16px 20px;
  }

  .nav.scrolled {
    padding: 12px 20px;
  }

  .nav-links {
    gap: 20px;
  }

  .nav-links a {
    font-size: 0.8rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-image-wrapper {
    max-width: 280px;
    margin: 0 auto;
  }

  .about-stats {
    gap: 32px;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .section {
    padding: 80px 0;
  }

  .cursor-glow {
    display: none;
  }
}

@media (max-width: 480px) {
  .nav-links {
    gap: 14px;
  }

  .about-stats {
    flex-direction: column;
    gap: 20px;
  }

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