/* ---------------------------------------------------------------------- */
/* Tokens                                                                  */
/* ---------------------------------------------------------------------- */
:root {
  --bg: #F7F7F4;
  --bg-alt: #EFEFEA;
  --ink: #14171A;
  --ink-soft: #5B5F66;
  --line: #D9D9D3;
  --accent: #2B44FF;
  --accent-soft: #EEF0FF;

  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --wrap: 880px;
  --gap: 24px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.mono { font-family: var(--font-mono); }
.muted { color: var(--ink-soft); }

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

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

/* ---------------------------------------------------------------------- */
/* Header                                                                  */
/* ---------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 247, 244, 0.88);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.01em;
}

.nav { display: flex; gap: 28px; }

.nav a {
  font-size: 14px;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}

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

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  padding-left: 20px;
  margin-left: 4px;
  border-left: 1px solid var(--line);
}

.lang-switch__current { color: var(--ink); font-weight: 600; }
.lang-switch__sep { color: var(--line); }
.lang-switch__link { color: var(--ink-soft); transition: color 0.15s ease; }
.lang-switch__link:hover { color: var(--accent); }

/* ---------------------------------------------------------------------- */
/* Eyebrow (structural device: comment syntax from Python/R "#" and SQL "--") */
/* ---------------------------------------------------------------------- */
.eyebrow {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--accent);
  margin: 0 0 14px;
}

/* ---------------------------------------------------------------------- */
/* Hero                                                                    */
/* ---------------------------------------------------------------------- */
.hero {
  padding: 108px 24px 72px;
}

.hero__title {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(40px, 7vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}

.hero__role {
  font-size: 16px;
  color: var(--ink-soft);
  margin: 0 0 22px;
}

.hero__tagline {
  max-width: 560px;
  font-size: 18px;
  color: var(--ink);
  margin: 0 0 36px;
}

.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 12px 20px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn--primary {
  background: var(--ink);
  color: var(--bg);
}
.btn--primary:hover { background: var(--accent); border-color: var(--accent); }

.btn--ghost {
  background: transparent;
  color: var(--ink);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------------------------------------------------------------- */
/* Sections                                                                 */
/* ---------------------------------------------------------------------- */
.section { padding: 64px 24px; border-top: 1px solid var(--line); }
.section--alt { background: var(--bg-alt); }

.about__text {
  max-width: 620px;
  font-size: 17px;
  margin: 0;
}

/* ---------------------------------------------------------------------- */
/* Skills                                                                   */
/* ---------------------------------------------------------------------- */
.skills {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.skills__item {
  display: flex;
  align-items: baseline;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.skills__name {
  flex: 0 0 140px;
  font-size: 15px;
  font-weight: 500;
  color: var(--accent);
}

.skills__note {
  color: var(--ink-soft);
  font-size: 15px;
}

/* ---------------------------------------------------------------------- */
/* Projects table                                                           */
/* ---------------------------------------------------------------------- */
.projects__head,
.projects__row {
  display: grid;
  grid-template-columns: 40px 1fr auto 24px;
  gap: 20px;
  align-items: center;
}

.projects__head {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0 16px 10px;
  border-bottom: 1px solid var(--line);
}

.projects__head-tags { justify-self: end; }

.projects__row {
  padding: 20px 16px;
  border-bottom: 1px solid var(--line);
  transition: background 0.15s ease;
}

.projects__row:hover { background: var(--accent-soft); }

.projects__id { color: var(--ink-soft); font-size: 14px; }

.projects__info { display: flex; flex-direction: column; gap: 4px; }
.projects__name { font-weight: 600; font-size: 16px; }
.projects__desc { color: var(--ink-soft); font-size: 14px; }

.projects__tags {
  display: flex;
  gap: 8px;
  justify-self: end;
  font-size: 12px;
}

.tag {
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 3px 8px;
  color: var(--ink-soft);
  white-space: nowrap;
}

.projects__arrow {
  justify-self: end;
  color: var(--accent);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.projects__row:hover .projects__arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ---------------------------------------------------------------------- */
/* Contact                                                                   */
/* ---------------------------------------------------------------------- */
.contact { border-top: 1px solid var(--line); }

.contact__row {
  display: flex;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.contact__label {
  flex: 0 0 100px;
  color: var(--ink-soft);
  font-size: 14px;
}

.contact__value {
  font-size: 15px;
  transition: color 0.15s ease;
}

.contact__row:hover .contact__value { color: var(--accent); }

/* ---------------------------------------------------------------------- */
/* Footer                                                                    */
/* ---------------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--line); }

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  padding: 24px;
  font-size: 13px;
}

/* ---------------------------------------------------------------------- */
/* Responsive                                                                */
/* ---------------------------------------------------------------------- */
@media (max-width: 640px) {
  .nav { gap: 12px; flex-wrap: wrap; row-gap: 8px; }
  .lang-switch { padding-left: 12px; margin-left: 0; }
  .hero { padding: 88px 20px 56px; }
  .skills__item { flex-direction: column; gap: 4px; }
  .skills__name { flex: none; }
  .projects__head { display: none; }
  .projects__row {
    grid-template-columns: 32px 1fr;
    grid-template-areas:
      "id name"
      "tags tags";
  }
  .projects__id { grid-area: id; }
  .projects__info { grid-area: name; }
  .projects__tags { grid-area: tags; justify-self: start; margin-top: 8px; flex-wrap: wrap; }
  .projects__arrow { display: none; }
  .contact__row { flex-direction: column; gap: 4px; }
}