/* ---------- Theme tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f4f5f7;
  --surface: #ffffff;
  --border: #e3e5e9;
  --text: #1c1e21;
  --text-soft: #5c6169;
  --accent: #2f6df6;
  --accent-contrast: #ffffff;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.05);
  --radius: 12px;
  --maxw: 880px;
}

:root[data-theme="dark"] {
  --bg: #0f1115;
  --bg-soft: #161920;
  --surface: #171a20;
  --border: #262b34;
  --text: #e8eaed;
  --text-soft: #9aa1ad;
  --accent: #5b8cff;
  --accent-contrast: #0f1115;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115;
    --bg-soft: #161920;
    --surface: #171a20;
    --border: #262b34;
    --text: #e8eaed;
    --text-soft: #9aa1ad;
    --accent: #5b8cff;
    --accent-contrast: #0f1115;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* Dynamic constellation background */
#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
}

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

h1, h2, h3 { line-height: 1.25; font-weight: 700; }

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 8px 14px;
  border-radius: 8px;
  z-index: 100;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 60px;
}

.nav__links {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
  margin-right: auto;
}

.nav__links a {
  color: var(--text-soft);
  font-size: 0.95rem;
}
.nav__links a:hover { color: var(--text); text-decoration: none; }

.theme-toggle {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 38px;
  height: 38px;
  cursor: pointer;
  font-size: 1rem;
  display: grid;
  place-items: center;
}

/* ---------- Hero ---------- */
.hero {
  padding-top: 72px;
  padding-bottom: 72px;
}

.hero__avatar {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
  box-shadow: var(--shadow);
  display: block;
  margin: 0 0 24px;
}

.hero__eyebrow {
  color: var(--text-soft);
  margin: 0 0 4px;
  font-size: 1rem;
}

.hero__name {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  letter-spacing: 0.02em;
  margin: 0 0 8px;
}

.hero__title {
  font-size: clamp(1.1rem, 3vw, 1.4rem);
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 20px;
}

.hero__blurb {
  font-size: 1.1rem;
  color: var(--text-soft);
  max-width: 60ch;
  margin: 0 0 32px;
}

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

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  transition: transform 0.1s ease, opacity 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary { background: var(--accent); color: var(--accent-contrast); }
.btn--ghost { background: transparent; border-color: var(--border); color: var(--text); }

/* ---------- Sections ---------- */
.section {
  padding-block: 56px;
  border-top: 1px solid var(--border);
}

.section__title {
  font-size: clamp(1.6rem, 4vw, 2rem);
  margin: 0 0 8px;
}

.section__lead {
  color: var(--text-soft);
  margin: 0 0 32px;
  font-size: 1.05rem;
}

/* ---------- Projects ---------- */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.card__title { margin: 0 0 8px; font-size: 1.2rem; }
.card__desc { margin: 0 0 16px; color: var(--text-soft); flex-grow: 1; }

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}
.card__tags li {
  font-size: 0.8rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text-soft);
  padding: 3px 10px;
  border-radius: 999px;
}

.card__links { display: flex; gap: 16px; font-size: 0.92rem; font-weight: 600; }

/* ---------- Timeline ---------- */
.timeline { margin: 0 0 32px; }

.timeline__item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid var(--border);
}
.timeline__item:first-child { border-top: none; }

.timeline__meta { color: var(--text-soft); font-size: 0.9rem; padding-top: 3px; }
.timeline__body h3 { margin: 0 0 2px; font-size: 1.1rem; }
.timeline__org { margin: 0 0 8px; color: var(--accent); font-weight: 600; font-size: 0.95rem; }
.timeline__body p { margin: 0; color: var(--text-soft); }
.timeline__body ul { margin: 0; padding-left: 18px; color: var(--text-soft); }
.timeline__body ul li { margin: 4px 0; }

/* ---------- Featured project ---------- */
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.feature__title { margin: 0 0 4px; font-size: 1.35rem; }
.feature__sub { margin: 0 0 16px; color: var(--accent); font-weight: 600; font-size: 0.95rem; }
.feature__desc { margin: 0 0 18px; color: var(--text-soft); max-width: 65ch; }

/* ---------- Skills ---------- */
.skills {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}
.skills__group h3 { margin: 0 0 6px; font-size: 1rem; }
.skills__group p { margin: 0; color: var(--text-soft); font-size: 0.95rem; }

.skills__heading { margin: 28px 0 8px; font-size: 1.15rem; }

.plain-list {
  margin: 0;
  padding-left: 18px;
  color: var(--text-soft);
}
.plain-list li { margin: 5px 0; }

/* ---------- Contact ---------- */
.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 1.05rem;
}

/* ---------- Footer ---------- */
.site-footer {
  padding-block: 40px;
  color: var(--text-soft);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
}

/* ---------- Responsive ---------- */
@media (max-width: 560px) {
  .nav__links { gap: 14px; }
  .timeline__item { grid-template-columns: 1fr; gap: 4px; }
}