/* ============================================
   Luc Herlitz — Personal Website
   Modern dark theme, clean typography
   ============================================ */

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

:root {
  --bg: #0a0a0a;
  --bg-alt: #111111;
  --surface: #1a1a1a;
  --surface-hover: #222222;
  --border: #2a2a2a;
  --text: #ededed;
  --text-muted: #888888;
  --text-subtle: #555555;
  --accent: #1248b8;
  --accent-light: #6a9eef;
  --accent-dim: rgba(18, 72, 184, 0.3);
  --accent-glow: rgba(30, 85, 200, 0.55);
  --radius: 0.75rem;
  --radius-sm: 0.5rem;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 200ms ease;
  --max-width: 1100px;
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg) radial-gradient(ellipse at 50% 0%, rgba(18, 72, 184, 0.18) 0%, transparent 55%) no-repeat;
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.icon {
  width: 18px;
  height: 18px;
}

.icon-lg {
  width: 28px;
  height: 28px;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  transition: background var(--transition), backdrop-filter var(--transition);
}

.nav.scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color var(--transition);
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 0.5rem;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 6rem 1.5rem 4rem;
  overflow: hidden;
}

.hero-content {
  max-width: 720px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-light);
  background: var(--accent-dim);
  border: 1px solid rgba(9, 36, 117, 0.4);
  padding: 0.35rem 1rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(2.75rem, 7vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

.hero-gradient {
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 65%);
  pointer-events: none;
  opacity: 0.85;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font-sans);
}

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

.btn-primary:hover {
  background: var(--accent);
  color: var(--text);
  transform: translateY(-1px);
}

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

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

/* --- Sections --- */
.section {
  padding: 6rem 0;
}

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

.section-header {
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

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

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

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  transition: border-color var(--transition);
}

.stat-card:hover {
  border-color: var(--text-subtle);
}

.stat-number {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent-light);
  letter-spacing: -0.02em;
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  line-height: 1.4;
}

/* --- Timeline --- */
.timeline {
  position: relative;
  padding-left: 2.5rem;
}

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

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

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

.timeline-marker {
  position: absolute;
  left: -2.5rem;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent-light);
  z-index: 1;
}

.timeline-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition);
}

.timeline-content:hover {
  border-color: var(--text-subtle);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  gap: 1rem;
}

.timeline-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.timeline-role {
  display: block;
  font-size: 0.875rem;
  color: var(--accent-light);
  margin-top: 0.25rem;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.timeline-content > p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.timeline-highlights {
  list-style: none;
  margin-bottom: 1rem;
}

.timeline-highlights li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.timeline-highlights li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-light);
  font-weight: 500;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--accent-dim);
  padding: 0.25rem 0.65rem;
  border-radius: 100px;
  letter-spacing: 0.02em;
}

/* --- Projects --- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--text-subtle);
  transform: translateY(-2px);
}

.project-icon {
  color: var(--accent-light);
  margin-bottom: 1.25rem;
}

.project-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.project-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1rem;
  transition: color var(--transition);
}

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

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

/* Let the last skill card span full width when odd count */
.skills-grid > :last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.skill-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition);
}

.skill-group:hover {
  border-color: var(--text-subtle);
}

.skill-group h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
}

.skill-group h3 .icon {
  color: var(--accent-light);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tags span {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: border-color var(--transition);
}

.skill-tags span:hover {
  border-color: var(--text-subtle);
}

/* --- Testimonials Marquee --- */
.marquee-wrapper {
  overflow: hidden;
  height: 700px;
  position: relative;
  mask-image: linear-gradient(to bottom, transparent, black 8%, black 92%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, transparent, black 8%, black 92%, transparent);
  cursor: pointer;
}

/* Desktop: click to pause/resume */
.marquee-paused .marquee-scroll {
  animation-play-state: paused !important;
}

.marquee-paused {
  cursor: default;
}

.marquee-columns {
  display: flex;
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
}

.marquee-column {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.marquee-scroll {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.marquee-up .marquee-scroll {
  animation: marqueeUp 40s linear infinite;
}

.marquee-down .marquee-scroll {
  animation: marqueeDown 50s linear infinite;
}

.marquee-up-slow .marquee-scroll {
  animation: marqueeUp 45s linear infinite;
}

@keyframes marqueeUp {
  0% { transform: translateY(0); }
  100% { transform: translateY(-50%); }
}

@keyframes marqueeDown {
  0% { transform: translateY(-50%); }
  100% { transform: translateY(0); }
}

.rec-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition);
  flex-shrink: 0;
}

/* Only apply hover on devices with a real pointer (not touch) */
@media (hover: hover) {
  .rec-card:hover {
    border-color: var(--text-subtle);
  }
}

/* Mobile carousel — hidden on desktop, built by JS */
.mobile-carousel {
  display: none;
}

.rec-quote {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 1rem;
  font-style: italic;
}

.rec-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.rec-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid rgba(18, 72, 184, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
  font-weight: 600;
  font-size: 0.75rem;
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.rec-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.rec-info .rec-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  transition: color var(--transition);
}

.rec-info .rec-name:hover {
  color: var(--accent-light);
}

.rec-info .rec-title {
  font-size: 0.7rem;
  color: var(--text-subtle);
  line-height: 1.3;
}

/* --- Contact --- */
.contact-block {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-block h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.contact-block > p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.75rem 2.5rem;
  color: var(--accent-light);
  transition: all var(--transition);
  min-width: 140px;
}

.contact-card:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-2px);
}

.contact-card span {
  font-size: 0.9rem;
  font-weight: 500;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-subtle);
}

.footer-note {
  font-style: italic;
}

/* --- Animations --- */
.animate-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
  animation-delay: var(--delay, 0s);
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
  }

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

  .nav-toggle {
    display: block;
  }

  .hero {
    min-height: 85vh;
    padding: 5rem 1.5rem 3rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

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

  .about-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
  }

  .stat-card {
    padding: 1rem;
  }

  .stat-number {
    font-size: 1.35rem;
  }

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

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

  /* Hide desktop marquee on mobile */
  .marquee-wrapper {
    display: none;
  }

  /* Mobile carousel — native scroll-snap */
  .mobile-carousel {
    display: block;
    position: relative;
  }

  .carousel-track {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 0 1rem;
  }

  .carousel-track::-webkit-scrollbar {
    display: none;
  }

  .carousel-slide {
    flex: 0 0 calc(100% - 2rem);
    scroll-snap-align: center;
    padding: 0 0.25rem;
    box-sizing: border-box;
  }

  .carousel-slide .rec-card {
    margin: 0;
    height: 100%;
  }

  .carousel-dots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.25rem;
    padding: 0.5rem 0;
  }

  .carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    border: none;
    padding: 0;
    cursor: pointer;
    transition: background 0.25s ease, transform 0.25s ease;
  }

  .carousel-dot.active {
    background: var(--accent-light);
    transform: scale(1.3);
  }

  .timeline {
    padding-left: 2rem;
  }

  .timeline-marker {
    left: -2rem;
    width: 12px;
    height: 12px;
  }

  .timeline-header {
    flex-direction: column;
    gap: 0.25rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .about-stats {
    grid-template-columns: 1fr 1fr;
  }

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

  .contact-card {
    width: 100%;
    max-width: 280px;
  }
}