:root {
  color-scheme: light;
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --surface-soft: #F1F5F9;
  --surface-border: #E2E8F0;
  --text: #0F172A;
  --text-muted: #475569;
  --accent: #1E3A8A;
  --accent-soft: #60A5FA;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.06);
  --radius: 24px;
  --radius-sm: 16px;
  --transition: 220ms ease;
  font-family: "Inter", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

button {
  font: inherit;
  cursor: pointer;
}

.max-width {
  width: min(1200px, calc(100% - 32px));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  inset: 0 auto auto 0;
  width: 100%;
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--surface-border);
  z-index: 20;
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0.75rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-mark {
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--accent);
  color: white;
  font-weight: 700;
  overflow: hidden;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-name {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.brand-role {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.lang-switch {
  display: flex;
  gap: 0.35rem;
  background: white;
  border: 1px solid var(--surface-border);
  border-radius: 999px;
  padding: 0.15rem;
}

.lang-button {
  min-width: 2.6rem;
  padding: 0.65rem 0.85rem;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--text);
  font-weight: 600;
  transition: background var(--transition), color var(--transition);
}

.lang-button.active,
.lang-button:hover {
  background: var(--accent);
  color: white;
}

.menu-toggle {
  width: 2.5rem;
  height: 2.3rem;
  display: grid;
  place-items: center;
  gap: 0.3rem;
  padding: 0;
  background: transparent;
  border: none;
}

.menu-toggle span {
  display: block;
  width: 1.7rem;
  height: 2px;
  background: var(--text);
  border-radius: 999px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-panel {
  position: absolute;
  inset: 100% 0 auto 0;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  background: white;
  border-bottom: 1px solid var(--surface-border);
  transition: max-height 260ms ease, opacity 260ms ease;
  z-index: 10;
}

.nav-panel.open {
  max-height: 100vh;
  opacity: 1;
}

.nav-list {
  display: grid;
  gap: 0.65rem;
  list-style: none;
  margin: 0;
  padding: 1rem 0.75rem 1.25rem;
}

.nav-list a {
  display: block;
  padding: 0.95rem 1rem;
  border-radius: 16px;
  color: var(--text);
  background: white;
  border: 1px solid var(--surface-border);
  transition: background var(--transition), transform var(--transition);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  background: var(--surface-soft);
  transform: translateX(3px);
}

main {
  padding-top: 5.2rem;
}

.hero {
  padding: 5rem 0 3rem;
}

.hero-inner {
  display: grid;
  gap: 2rem;
  align-items: start;
  padding-top: 1rem;
}

.eyebrow {
  display: inline-flex;
  margin-bottom: 1rem;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero-title {
  margin: 0;
  font-size: clamp(2.8rem, 8vw, 4.1rem);
  line-height: 0.98;
  max-width: 11ch;
}

.hero-text {
  margin: 1.3rem 0 2rem;
  max-width: 56ch;
  font-size: clamp(1rem, 2vw, 1.12rem);
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.button-primary {
  background: var(--accent);
  color: white;
}

.button-secondary {
  background: white;
  color: var(--text);
  border-color: var(--surface-border);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.hero-panel {
  padding: 0;
  background: transparent;
  border: none;
  display: grid;
  place-items: center;
  max-width: min(420px, 100%);
  width: 100%;
  margin-inline: auto;
}

.hero-profile-image {
  width: min(100%, 420px);
  height: auto;
  display: block;
  border-radius: var(--radius);
  object-fit: contain;
}

.section {
  padding: 4rem 0;
}

.section--soft {
  background: var(--surface-soft);
}

.section-header {
  display: grid;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.section-title {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.05;
  max-width: 12ch;
}

.section-subtitle {
  margin: 0;
  color: var(--text-muted);
  max-width: 66ch;
}

.cards-grid,
.skill-grid,
.contact-grid {
  display: grid;
  gap: 1.25rem;
}

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

.exp-card,
.info-card,
.cert-card,
.project-card,
.skill-card,
.contact-card {
  background: white;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.6rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.exp-card {
  cursor: default;
}

.exp-card:hover,
.exp-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(30, 58, 138, 0.18);
}

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

.exp-card-period,
.info-meta,
.cert-label,
.skill-card-sub,
.project-text,
.contact-label {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.exp-card-company,
.info-title,
.cert-title,
.skill-card-title,
.project-title,
.contact-title {
  margin: 0.35rem 0 0;
  font-size: 1.1rem;
}

.exp-card-role {
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}

.exp-list {
  margin: 0;
  padding: 0;
  color: var(--text-muted);
  line-height: 1.85;
  list-style: none;
  max-height: 9rem;
  overflow: hidden;
  transition: max-height 0.24s ease;
}

.exp-card.expanded .exp-list {
  max-height: none;
}

.exp-card-basf:not(.expanded) .exp-list {
  max-height: none;
}

.exp-card-basf:not(.expanded) .exp-list li:not(.role-milestone) {
  display: none;
}

.exp-list li {
  position: relative;
  margin: 0.75rem 0;
  padding-left: 1.4rem;
}

.exp-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 999px;
  background: radial-gradient(circle at top left, rgba(96, 165, 250, 0.95), rgba(30, 58, 138, 0.9));
  border: 1px solid var(--accent);
}

.exp-list .role-milestone {
  margin: 0.9rem 0;
  padding: 0.75rem 0.9rem 0.75rem 2.35rem;
  border: 1px solid rgba(96, 165, 250, 0.2);
  border-radius: 0.8rem;
  background: rgba(30, 58, 138, 0.08);
  color: var(--text);
}

.exp-list .role-milestone::before {
  left: 0.9rem;
  top: 1.18rem;
  width: 0.58rem;
  height: 0.58rem;
  border-radius: 50%;
  transform: none;
}

.exp-list .role-milestone-current::before {
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.16);
  transform: none;
  animation: current-role-pulse 1.8s ease-out infinite;
}

@keyframes current-role-pulse {
  0% { box-shadow: 0 0 0 0 rgba(96, 165, 250, 0.5); }
  70%, 100% { box-shadow: 0 0 0 8px rgba(96, 165, 250, 0); }
}

.exp-card-basf { order: -2; }
.exp-card-current { order: -1; }

@media (prefers-reduced-motion: reduce) {
  .exp-list .role-milestone-current::before { animation: none; }
}

.exp-toggle {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 1px solid var(--surface-border);
  color: var(--text);
  font-weight: 600;
  min-width: max-content;
}

.info-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  gap: 0.4rem;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  background: #eef2ff;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
}

.info-subtitle,
.info-text {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
}

.info-text {
  line-height: 1.8;
}

.cert-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.cert-card {
  display: flex;
  flex-direction: column;
}

.cert-icon {
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: #eff6ff;
  color: var(--accent);
  font-weight: 700;
  overflow: hidden;
}

.cert-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cert-title {
  margin: 1rem 0 0;
}

.cert-text {
  margin: 0.85rem 0 1.25rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.cert-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 2.75rem;
  margin-top: auto;
  padding: 0.7rem 1.1rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent);
  color: white;
  font-size: 0.92rem;
  font-weight: 600;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}

.cert-link::after {
  content: "↗";
  margin-left: 0.5rem;
  font-size: 1rem;
}

.cert-link:hover,
.cert-link:focus-visible {
  transform: translateY(-1px);
  background: #172f73;
  box-shadow: 0 10px 22px rgba(30, 58, 138, 0.2);
}

.cert-link:focus-visible {
  outline: 3px solid rgba(96, 165, 250, 0.45);
  outline-offset: 3px;
}

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

.skill-card {
  display: grid;
  gap: 1rem;
}

.skill-card-title {
  margin: 0;
  font-size: 1.1rem;
}

.skill-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.skill-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  background: #eff6ff;
  color: var(--text);
  font-size: 0.95rem;
}

.skill-card-wide {
  grid-column: span 1;
}

.project-card {
  display: grid;
  gap: 1rem;
}

.project-text {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.75;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.project-tags span {
  display: inline-flex;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  background: #eff6ff;
  color: var(--text);
  font-size: 0.9rem;
}

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

.contact-card {
  display: grid;
  gap: 1rem;
}

.contact-label {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.contact-title {
  margin: 0;
  font-size: 1.1rem;
}

.footer-inner {
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
}

@media (min-width: 768px) {
  main {
    padding-top: 8.25rem;
  }

  .nav-panel {
    position: static;
    max-height: none;
    opacity: 1;
    overflow: visible;
    background: transparent;
    border-bottom: none;
  }

  .nav-list {
    grid-auto-flow: column;
    justify-content: center;
    gap: 1rem;
    width: min(1200px, calc(100% - 32px));
    margin-inline: auto;
    padding: 0 0 0.7rem;
  }

  .nav-list a {
    background: transparent;
    border-color: transparent;
    color: var(--text);
    padding: 0.45rem 0.55rem;
  }

  .nav-list a:hover,
  .nav-list a:focus-visible {
    transform: none;
    background: rgba(59, 130, 246, 0.1);
  }

  .menu-toggle {
    display: none;
  }
}

@media (min-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1.1fr) 360px;
    align-items: center;
  }

  .cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .skill-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .skill-card-wide {
    grid-column: span 2;
  }

  .contact-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 899px) {
  .hero-panel {
    display: none;
  }
}

@media (max-width: 640px) {
  .section-title {
    font-size: clamp(1.75rem, 8vw, 2.3rem);
  }

  .hero-title {
    font-size: clamp(2.4rem, 10vw, 3.4rem);
  }

  .header-inner {
    padding: 0.9rem 0.75rem;
  }
}

@media (max-width: 420px) {
  .header-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.65rem 0.75rem;
  }

  .brand {
    min-width: 0;
  }

  .brand > div {
    min-width: 0;
  }

  .brand-name,
  .brand-role {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .header-actions {
    display: contents;
  }

  .menu-toggle {
    grid-column: 2;
    grid-row: 1;
    align-self: center;
  }

  .lang-switch {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: end;
  }
}