/* ==========================================================================
   Markus Lachat — Professional Portfolio
   Dark Developer Theme
   ========================================================================== */

/* --- CSS Variables --- */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2233;
  --bg-card-hover: #1f2937;
  --border: #1e293b;
  --border-light: #2d3a4d;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-heading: #f1f5f9;
  --text-muted: #64748b;
  --accent-blue: #60a5fa;
  --accent-green: #34d399;
  --accent-purple: #a78bfa;
  --accent-amber: #fbbf24;
  --accent-blue-dim: rgba(96, 165, 250, 0.1);
  --accent-green-dim: rgba(52, 211, 153, 0.1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --max-width: 1200px;
  --nav-height: 64px;
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* --- Typography --- */
h1, h2, h3, h4 {
  color: var(--text-heading);
  line-height: 1.3;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.mono {
  font-family: var(--font-mono);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent-green);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 3rem;
}

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

section {
  padding: 5rem 0;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: background var(--transition);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-heading);
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-blue);
  transition: width var(--transition);
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: var(--transition);
  border-radius: 2px;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(96, 165, 250, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(167, 139, 250, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  max-width: 640px;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent-green);
  margin-bottom: 1rem;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text-heading) 0%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 1.5rem;
}

.hero-description {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-blue);
}

.hero-stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.hero-photo {
  position: relative;
}

.hero-photo img {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border-light);
  box-shadow: 0 0 60px rgba(96, 165, 250, 0.15);
}

.hero-photo::before {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 1px dashed var(--border-light);
  animation: spin 30s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- 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: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: var(--font-sans);
}

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

.btn-primary:hover {
  background: #93c5fd;
  color: var(--bg-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(96, 165, 250, 0.25);
}

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

.btn-outline:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-2px);
}

/* --- About --- */
#about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.about-highlights {
  display: grid;
  gap: 1rem;
}

.highlight-card {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.highlight-card:hover {
  border-color: var(--accent-blue);
  transform: translateX(4px);
}

.highlight-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-blue-dim);
  border-radius: var(--radius);
}

.highlight-card h4 {
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.highlight-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --- Competencies --- */
.competencies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.competency-card {
  padding: 2rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.competency-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-accent, var(--accent-blue));
  opacity: 0;
  transition: opacity var(--transition);
}

.competency-card:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.competency-card:hover::before {
  opacity: 1;
}

.competency-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.competency-card h3 {
  margin-bottom: 0.75rem;
}

.competency-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.competency-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: var(--accent-blue-dim);
  color: var(--accent-blue);
  border-radius: 999px;
  white-space: nowrap;
}

.tag--green {
  background: var(--accent-green-dim);
  color: var(--accent-green);
}

.tag--purple {
  background: rgba(167, 139, 250, 0.1);
  color: var(--accent-purple);
}

.tag--amber {
  background: rgba(251, 191, 36, 0.1);
  color: var(--accent-amber);
}

/* --- Experience Timeline --- */
#experience {
  background: var(--bg-secondary);
}

.timeline {
  position: relative;
  max-width: 900px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  padding-left: 2.5rem;
  padding-bottom: 2.5rem;
  position: relative;
}

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

.timeline-dot {
  position: absolute;
  left: -5px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-blue);
  z-index: 1;
}

.timeline-item:first-child .timeline-dot {
  background: var(--accent-blue);
  box-shadow: 0 0 12px rgba(96, 165, 250, 0.4);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-green);
  margin-bottom: 0.25rem;
}

.timeline-role {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 0.15rem;
}

.timeline-company {
  font-size: 0.95rem;
  color: var(--accent-blue);
  margin-bottom: 0.5rem;
}

.timeline-description {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.timeline-tags .tag {
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
}

/* --- Education --- */
.education-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.education-card {
  padding: 2rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.education-card .timeline-date {
  margin-bottom: 0.5rem;
}

.education-card h3 {
  margin-bottom: 0.25rem;
}

.education-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

.international-card {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.international-card .flag {
  font-size: 2rem;
  flex-shrink: 0;
}

.international-card h4 {
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.international-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --- Skills --- */
#skills {
  background: var(--bg-secondary);
}

.skills-columns {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2.5rem;
}

.skill-group h3 {
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.skill-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0;
}

.skill-name {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.skill-bar {
  width: 120px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  border-radius: 2px;
  background: var(--accent-blue);
  transition: width 1s ease-out;
}

.skill-bar-fill--green {
  background: var(--accent-green);
}

.skill-bar-fill--purple {
  background: var(--accent-purple);
}

/* Language skills */
.language-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 0;
}

.language-name {
  font-size: 0.9rem;
  min-width: 80px;
}

.language-level {
  display: flex;
  gap: 3px;
}

.language-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}

.language-dot.filled {
  background: var(--accent-blue);
}

/* --- Contact --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-info {
  display: grid;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: start;
}

.contact-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-blue-dim);
  border-radius: var(--radius);
  flex-shrink: 0;
  font-size: 1.25rem;
}

.contact-item h4 {
  font-size: 0.9rem;
  margin-bottom: 0.15rem;
}

.contact-item p,
.contact-item a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-cta {
  padding: 2rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  text-align: center;
}

.contact-cta h3 {
  margin-bottom: 0.75rem;
}

.contact-cta p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

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

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

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

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

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

.footer-link:hover {
  color: var(--text-primary);
}

/* --- Impressum --- */
.impressum-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all var(--transition);
}

.impressum-toggle:hover {
  border-color: var(--text-muted);
  color: var(--text-secondary);
}

.impressum-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease-out, padding 0.3s ease;
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
}

.impressum-content.open {
  max-height: 2000px;
  padding: 2rem 0;
}

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

.impressum-inner h3 {
  color: var(--text-heading);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.impressum-inner h3:first-child {
  margin-top: 0;
}

.impressum-inner p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
  line-height: 1.7;
}

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

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

/* --- Code decoration --- */
.code-comment {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.code-comment::before {
  content: '// ';
  color: var(--accent-green);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .skills-columns {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  section {
    padding: 3.5rem 0;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
  }

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

  .nav-toggle {
    display: block;
  }

  .nav-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-photo {
    order: -1;
    justify-self: center;
  }

  .hero-photo img {
    width: 200px;
    height: 200px;
  }

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

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

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

  .education-grid,
  .international-grid {
    grid-template-columns: 1fr;
  }

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

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

  .footer .container {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    gap: 1.5rem;
  }

  .hero-stat-value {
    font-size: 1.5rem;
  }

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