:root {
  --bg: #0e1117;
  --bg-alt: #131823;
  --surface: #1a2130;
  --border: #263041;
  --text: #e6edf3;
  --text-dim: #9aa7b8;
  --accent: #58a6ff;
  --accent-strong: #7cc0ff;
  --radius: 10px;
  --container: 68rem;
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --bg-alt: #f6f8fa;
    --surface: #ffffff;
    --border: #d8dee4;
    --text: #1f2328;
    --text-dim: #57606a;
    --accent: #0969da;
    --accent-strong: #0550ae;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
}

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

a:hover,
a:focus-visible {
  color: var(--accent-strong);
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
}

.nav__brand {
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.nav__toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

.nav__toggle-bar,
.nav__toggle-bar::before,
.nav__toggle-bar::after {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--text);
  margin-inline: auto;
  content: "";
}

.nav__toggle-bar {
  position: relative;
}

.nav__toggle-bar::before {
  position: absolute;
  top: -6px;
}

.nav__toggle-bar::after {
  position: absolute;
  top: 6px;
}

.nav__menu {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__menu a {
  color: var(--text-dim);
  font-size: 0.95rem;
}

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

/* Hero */
.hero {
  padding-block: clamp(3.5rem, 10vw, 7rem);
}

.hero__eyebrow {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.hero__title {
  font-size: clamp(2.4rem, 7vw, 4rem);
  margin-bottom: 0.3em;
}

.hero__subtitle {
  max-width: 42ch;
  font-size: 1.1rem;
  color: var(--text-dim);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  list-style: none;
  margin: 3rem 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.9rem;
}

.hero__meta li::before {
  content: "\25cf";
  color: var(--accent);
  margin-right: 0.5rem;
  font-size: 0.7em;
  vertical-align: middle;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease,
    border-color 0.15s ease;
}

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

.btn--primary:hover {
  background: var(--accent-strong);
  color: #fff;
  text-decoration: none;
}

.btn--ghost {
  border-color: var(--border);
  color: var(--text);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.btn:active {
  transform: translateY(1px);
}

/* Sections */
.section {
  padding-block: clamp(3rem, 8vw, 5rem);
}

.section--alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--border);
  padding-inline: 0;
}

.section--alt > .container {
  padding-block: clamp(3rem, 8vw, 5rem);
}

.section__title {
  font-size: clamp(1.5rem, 4vw, 2rem);
}

.section__lead {
  max-width: 55ch;
  color: var(--text-dim);
}

/* Cards */
.grid {
  display: grid;
  gap: 1.25rem;
}

.grid--projects {
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  margin-top: 2.5rem;
}

.card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

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

.card__title {
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
}

.card__meta {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
}

.card__body {
  font-size: 0.95rem;
  color: var(--text-dim);
  flex-grow: 1;
}

.card__link {
  font-size: 0.9rem;
  font-weight: 600;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0.5rem 0 1rem;
  padding: 0;
}

.tags li {
  padding: 0.15rem 0.55rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* About */
.about {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 52rem) {
  .about {
    grid-template-columns: 1.4fr 1fr;
    align-items: start;
  }
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 0;
}

.stat {
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat dt {
  color: var(--text-dim);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat dd {
  margin: 0.25rem 0 0;
  font-size: 1.75rem;
  font-weight: 700;
}

/* Skills */
.grid--skills {
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  margin-top: 2rem;
}

.skill-group {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.skill-group h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.skill-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}

/* Contact */
.form {
  max-width: 32rem;
  margin-top: 2rem;
}

.form__row {
  margin-bottom: 1rem;
}

.form__label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.form__input {
  width: 100%;
  padding: 0.65rem 0.8rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}

.form__input:focus {
  border-color: var(--accent);
}

.form__input[aria-invalid="true"] {
  border-color: #f85149;
}

.form__status {
  margin-top: 1rem;
  color: var(--text-dim);
  font-size: 0.9rem;
  min-height: 1.4em;
}

.socials {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 2rem;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.site-footer p {
  margin: 0;
}

/* Mobile nav */
@media (max-width: 40rem) {
  .nav__toggle {
    display: block;
  }

  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.25rem 1rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: none;
  }

  .nav__menu.is-open {
    display: flex;
  }

  .nav__menu a {
    display: block;
    padding: 0.6rem 0;
    font-size: 1rem;
  }
}

/* Motion preferences */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}