@import url('https://fonts.googleapis.com/css2?family=Nunito+Sans:wght@400;500;600;700;800&display=swap');

:root {
  color-scheme: light;
  --font-sans: 'Nunito Sans', 'Avenir Next', Avenir, 'Segoe UI', sans-serif;
  --theme-transition-bg: 280ms ease;
  --theme-transition-fg: 100ms ease;
  --background: #f6f4ef;
  --background-strong: rgba(255, 255, 255, 0.72);
  --surface: rgba(255, 255, 255, 0.68);
  --text-primary: #1d1e23;
  --text-secondary: #565962;
  --text-muted: #8b909a;
  --accent: #0000cd;
  --border: rgba(29, 30, 35, 0.1);
  --shadow: 0 18px 60px rgba(19, 21, 27, 0.08);
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --background: #111214;
  --background-strong: rgba(23, 24, 28, 0.78);
  --surface: rgba(18, 19, 22, 0.82);
  --text-primary: #f1efe9;
  --text-secondary: #b5b1a9;
  --text-muted: #7d8088;
  --accent: #4c5df5;
  --border: rgba(255, 255, 255, 0.1);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: var(--font-sans);
  background-color: var(--background);
  color: var(--text-primary);
  overflow-x: clip;
  transition:
    background-color var(--theme-transition-bg),
    color var(--theme-transition-fg);
}

a {
  color: inherit;
}

button,
input,
textarea,
select {
  font: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.site-shell {
  min-height: 100vh;
  padding: 1.5rem;
}

.theme-toggle {
  position: fixed;
  top: 1.1rem;
  right: 1.75rem;
  z-index: 30;
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background-color: var(--background-strong);
  color: var(--text-primary);
  padding: 0 0.72rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  transition:
    background-color var(--theme-transition-bg),
    border-color var(--theme-transition-fg),
    color var(--theme-transition-fg),
    box-shadow var(--theme-transition-bg);
}

.theme-toggle__label {
  line-height: 1;
}

.layout {
  width: min(100%, 55rem);
  margin: 0 auto;
  padding: 3.6rem 0 2.6rem;
}

.hero {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  column-gap: 1.25rem;
  gap: 1rem;
  padding: 0.6rem 0 1.5rem;
}

.hero__media {
}

.hero__portrait {
  display: block;
  width: clamp(5.25rem, 11vw, 7rem);
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
}

.hero__content {
  display: grid;
  gap: 1rem;
  min-width: 0;
  justify-items: start;
  margin-left: -0.18rem;
}

.timeline-card__eyebrow,
.timeline-card__date {
  margin: 0;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color var(--theme-transition-fg);
}

.hero__title {
  margin: 0;
  display: flex;
  align-items: baseline;
  font-size: clamp(1.95rem, 6.4vw, 4.25rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
  white-space: nowrap;
  max-width: 100%;
}

.hero__ellipsis {
  display: inline-block;
  min-width: 1.7ch;
  margin-left: 0.03em;
  vertical-align: baseline;
  transform: translateY(-0.02em);
}

.hero__links {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  width: 100%;
  padding-left: clamp(0.14rem, 0.35vw, 0.28rem);
}

.hero__links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  padding-bottom: 0.2rem;
  border-bottom: 1px solid transparent;
  transition:
    color var(--theme-transition-fg),
    border-color var(--theme-transition-fg);
}

.hero__links a:hover {
  border-color: currentColor;
}

.hero__link-icon {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  background-color: currentColor;
  mask-position: center;
  mask-repeat: no-repeat;
  mask-size: contain;
  -webkit-mask-position: center;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  margin-left: 0.060em;
  transition: background-color var(--theme-transition-fg);
}

.hero__link-icon--linkedin {
  mask-image: url('./assets/linkedin-svgrepo-com.svg');
  -webkit-mask-image: url('./assets/linkedin-svgrepo-com.svg');
}

.hero__link-icon--github {
  mask-image: url('./assets/github-svgrepo-com.svg');
  -webkit-mask-image: url('./assets/github-svgrepo-com.svg');
}

.section-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  margin-bottom: 0.9rem;
  min-height: calc(3.25rem + 1.1rem);
  padding: 1.1rem 0 0;
  display: flex;
  align-items: flex-end;
}

.section-nav::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(50% - 50vw);
  right: calc(50% - 50vw);
  z-index: -1;
  background-color: var(--background);
  transition: background-color var(--theme-transition-bg);
}

.section-nav__inner {
  display: flex;
  align-items: stretch;
  gap: 2.2rem;
  width: 100%;
  padding: 0;
  border-bottom: 1px solid var(--border);
  min-height: 100%;
  transition: border-color var(--theme-transition-fg);
}

.section-nav__button {
  position: relative;
  display: inline-flex;
  align-items: center;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  min-height: 100%;
  padding: 0.5rem 0 0.55rem;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  transition: color var(--theme-transition-fg);
}

.section-nav__button::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: transparent;
  transition: background-color var(--theme-transition-fg);
}

.section-nav__button.is-active {
  color: var(--text-primary);
  font-weight: 700;
}

.section-nav__button.is-active::after {
  background: var(--accent);
}

.content-section {
  scroll-margin-top: 7rem;
  padding: 0.5rem 0 0;
}

.content-section + .content-section {
  margin-top: 2.4rem;
}

.content-section__header {
  margin-bottom: 1rem;
}

.content-section__header h2 {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2.05rem);
}

.timeline-grid {
  display: grid;
  gap: 0.85rem;
}

.timeline-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background-color: var(--surface);
  box-shadow: var(--shadow);
  transition:
    background-color var(--theme-transition-bg),
    border-color var(--theme-transition-fg),
    box-shadow var(--theme-transition-bg);
}

.timeline-card__content {
  min-width: 0;
}

.timeline-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  margin-bottom: 0.75rem;
}

.timeline-card__title-group {
  display: grid;
  gap: 0.35rem;
}

.timeline-card__heading {
  margin: 0;
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  line-height: 1.45;
}

.timeline-card__eyebrow {
  color: var(--accent);
  font-weight: 550;
  transition: color var(--theme-transition-fg);
}

.timeline-card__date {
  flex-shrink: 0;
  text-align: right;
  transition: color var(--theme-transition-fg);
}

.timeline-card__list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--text-secondary);
  display: grid;
  gap: 0.7rem;
  line-height: 1.75;
  transition: color var(--theme-transition-fg);
}

.timeline-card__list li::marker {
  color: var(--accent);
  transition: color var(--theme-transition-fg);
}

@media (max-width: 640px) {
  .site-shell {
    padding: 1rem;
  }

  .layout {
    padding-top: 3.2rem;
  }

  .theme-toggle {
    top: 0.9rem;
    right: 1rem;
  }

  .hero {
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 0.9rem;
    padding-top: 0;
  }

  .hero__portrait {
    width: 4.5rem;
  }

  .section-nav {
    min-height: calc(3rem + 0.9rem);
    padding-top: 0.9rem;
  }

  .section-nav__inner {
    gap: 1.5rem;
  }

  .section-nav__button {
    flex: 0 0 auto;
    min-height: 3rem;
    padding-bottom: 0.55rem;
  }

  .timeline-card__header {
    flex-direction: column;
  }

  .timeline-card__date {
    text-align: left;
  }
}

@media (max-width: 420px) {
  .hero__title {
    font-size: 1.8rem;
  }
}