/* ---- Design tokens ---- */
:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --surface: #ffffff;
  --text: #1a1d24;
  --text-soft: #565b66;
  --border: #e6e8ec;
  --accent: #4f46e5;
  --accent-soft: #eef0fe;
  --shadow: 0 1px 2px rgba(20, 22, 28, .04), 0 8px 24px rgba(20, 22, 28, .06);
  --radius: 14px;
  --maxw: 820px;
}
:root[data-theme="dark"] {
  --bg: #0d0f14;
  --bg-soft: #14171e;
  --surface: #161a22;
  --text: #e8eaf0;
  --text-soft: #9aa1ad;
  --border: #262b35;
  --accent: #8b87ff;
  --accent-soft: #1c1f33;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.4);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #0d0f14; --bg-soft: #14171e; --surface: #161a22;
    --text: #e8eaf0; --text-soft: #9aa1ad; --border: #262b35;
    --accent: #8b87ff; --accent-soft: #1c1f33;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.4);
  }
}

/* ---- Base ---- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.2; margin: 0; }
main { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }

/* ---- Nav ---- */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 0 auto; padding: 1rem 1.25rem;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
}
.nav__brand { color: var(--text); font-weight: 700; letter-spacing: -.01em; text-transform: uppercase; font-size: .9rem; }
.nav__brand:hover { text-decoration: none; color: var(--accent); }
.nav__links { display: flex; align-items: center; gap: 1.25rem; }
.nav__links a { color: var(--text-soft); font-size: .9rem; }
.nav__links a:hover { color: var(--text); text-decoration: none; }
.nav__theme {
  background: none; border: 0; cursor: pointer; color: var(--text-soft);
  font-size: 1.1rem; line-height: 1; padding: .2rem;
}
.nav__theme:hover { color: var(--accent); }

/* ---- Hero ---- */
.hero { text-align: center; padding: 3.5rem 0 2.5rem; }
.hero__photo {
  width: 160px; height: 160px; border-radius: 50%; object-fit: cover;
  border: 3px solid var(--surface); box-shadow: var(--shadow); margin-bottom: 1.5rem;
}
.hero__name { font-size: 2.4rem; letter-spacing: -.02em; }
.hero__role { color: var(--accent); font-weight: 600; margin: .4rem 0 0; }
.hero__tagline { color: var(--text-soft); max-width: 32rem; margin: 1rem auto 0; }
.hero__cta { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; margin-top: 1.75rem; }

/* ---- Buttons ---- */
.btn {
  display: inline-block; padding: .65rem 1.25rem; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font-weight: 600; font-size: .9rem; transition: transform .08s ease, box-shadow .15s ease;
}
.btn:hover { text-decoration: none; box-shadow: var(--shadow); transform: translateY(-1px); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---- Socials ---- */
.socials { display: flex; gap: 1.25rem; justify-content: center; margin-top: 1.5rem; }
.socials a { color: var(--text-soft); font-size: .85rem; font-weight: 600; }
.socials a:hover { color: var(--accent); text-decoration: none; }

/* ---- Sections ---- */
.section { padding: 2.5rem 0; border-top: 1px solid var(--border); }
.section__title {
  font-size: .8rem; text-transform: uppercase; letter-spacing: .12em;
  color: var(--text-soft); margin-bottom: 1.5rem;
}

/* ---- Projects ---- */
.projects { display: grid; gap: 1.25rem; }
.card {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
}
.card--featured { border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); box-shadow: var(--shadow); }
.card__badge {
  position: absolute; top: -.7rem; left: 1.5rem; background: var(--accent); color: #fff;
  font-size: .65rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em;
  padding: .25rem .6rem; border-radius: 999px;
}
.card__title { font-size: 1.2rem; }
.card__desc { color: var(--text-soft); margin: .75rem 0 1rem; }
.card__links a { font-weight: 600; font-size: .9rem; }

/* ---- Chips ---- */
.chips { display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; margin: 0; list-style: none; }
.chips li {
  background: var(--accent-soft); color: var(--accent); border-radius: 999px;
  padding: .25rem .7rem; font-size: .78rem; font-weight: 600;
}
.chips--lg li { font-size: .85rem; padding: .35rem .9rem; }

/* ---- Timeline / entries ---- */
.timeline { display: grid; gap: 1.5rem; }
.entry__head { display: flex; flex-wrap: wrap; align-items: baseline; gap: .25rem .75rem; }
.entry__role { font-size: 1.1rem; }
.entry__meta { color: var(--accent); font-weight: 600; font-size: .9rem; }
.entry__date { color: var(--text-soft); font-size: .82rem; margin-left: auto; }
.entry__duties { color: var(--text-soft); margin: .75rem 0 0; padding-left: 1.1rem; }
.entry__duties li { margin-bottom: .4rem; }
.entry__sub { color: var(--text-soft); margin: .5rem 0 0; font-size: .92rem; }

/* ---- Contact ---- */
.section--contact { text-align: center; }
.contact__line { color: var(--text-soft); margin: 0 0 .5rem; }

/* ---- Footer ---- */
.footer { max-width: var(--maxw); margin: 0 auto; padding: 2.5rem 1.25rem 3rem; text-align: center; border-top: 1px solid var(--border); }
.footer__copy { color: var(--text-soft); font-size: .82rem; margin-top: 1rem; }

/* ---- Responsive ---- */
@media (min-width: 640px) {
  .projects { grid-template-columns: 1fr 1fr; }
  .card--featured { grid-column: 1 / -1; }
}
@media (max-width: 520px) {
  .hero__name { font-size: 2rem; }
  .entry__date { margin-left: 0; width: 100%; }
}