/* ---------- base ---------- */

:root {
  --bg: #0a0a0a;
  --bg-card: #111110;
  --bg-thumb: #141413;
  --fg: #e8e6df;
  --fg-bright: #f4f3ee;
  --fg-body: #9a988f;
  --fg-mid: #8b8a82;
  --fg-dim: #6b6a63;
  --fg-tag: #8a8880;
  --line: rgba(232, 230, 223, 0.08);
  --line-strong: rgba(232, 230, 223, 0.12);
  --mono: 'JetBrains Mono', monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Public Sans', sans-serif;
}

::selection { background: #3a3a38; color: #fff; }

a { color: var(--fg); }
a:hover { color: var(--fg-body); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- layout ---------- */

.layout {
  display: flex;
  min-height: 100vh;
}

main {
  flex: 1;
  padding: 80px 88px;
  max-width: 880px;
  display: flex;
  flex-direction: column;
}

.page { display: none; }
.page.active { display: block; animation: fadeUp 0.5s ease; }

/* ---------- sidebar ---------- */

.sidebar {
  width: 220px;
  flex: none;
  padding: 56px 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid var(--line);
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand { text-decoration: none; display: block; }
.brand-name { font-size: 16px; letter-spacing: 0.01em; margin-bottom: 2px; color: var(--fg-bright); }
.brand-sub {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.03em;
  margin-bottom: 52px;
}

.nav-links { display: flex; flex-direction: column; gap: 2px; }

.nav-link {
  font-size: 14px;
  padding: 9px 10px;
  border-radius: 6px;
  color: var(--fg-body);
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-link:hover { color: var(--fg-bright); background: rgba(232, 230, 223, 0.04); }
.nav-link.active { color: var(--fg-bright); background: rgba(232, 230, 223, 0.06); }
.nav-link:focus-visible { outline: 1px solid var(--fg-dim); outline-offset: 2px; }

.social-links { display: flex; flex-direction: column; gap: 9px; font-size: 13px; }
.social-links a { color: var(--fg-dim); text-decoration: none; transition: color 0.15s ease; }
.social-links a:hover { color: var(--fg-bright); }

/* ---------- about ---------- */

.hero {
  font-weight: 400;
  font-size: 34px;
  line-height: 1.4;
  margin: 0 0 28px;
  max-width: 620px;
  color: var(--fg-bright);
}

.lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--fg-body);
  max-width: 560px;
  margin: 0 0 18px;
}
.lede:last-of-type { margin-bottom: 48px; }

.now {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}
.now-label {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-dim);
  flex: none;
}
.now-text { font-size: 14px; line-height: 1.7; color: var(--fg-body); }

/* ---------- shared page bits ---------- */

.page-title { font-weight: 400; font-size: 28px; margin: 0 0 10px; color: var(--fg-bright); }
.page-sub { font-size: 14px; color: var(--fg-dim); margin: 0 0 40px; }

.label {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-dim);
  margin-bottom: 14px;
}

/* ---------- cs portfolio ---------- */

.skills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 44px; }
.skill {
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  color: #c7c5bc;
}

.project-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.project-card {
  text-decoration: none;
  color: inherit;
  display: block;
  padding: 26px;
  border: 1px solid rgba(232, 230, 223, 0.1);
  border-radius: 10px;
  background: var(--bg-card);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.project-card:hover { border-color: rgba(232, 230, 223, 0.25); transform: translateY(-2px); color: inherit; }
.project-tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-tag);
  letter-spacing: 0.03em;
  margin-bottom: 10px;
  text-transform: uppercase;
}
.project-title { font-size: 18px; margin-bottom: 8px; color: var(--fg-bright); }
.project-desc { font-size: 14px; color: var(--fg-mid); line-height: 1.6; }

/* ---------- content portfolio ---------- */

.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 18px;
}

.content-card { text-decoration: none; color: inherit; display: block; }
.content-thumb {
  aspect-ratio: 4 / 3;
  background: var(--bg-thumb);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  overflow: hidden;
  transition: border-color 0.15s ease;
}
.content-thumb img { width: 100%; height: 100%; object-fit: cover; }
.content-card:hover .content-thumb { border-color: rgba(232, 230, 223, 0.25); }
.content-title { font-size: 14px; color: #c7c5bc; }
.content-card:hover .content-title { color: var(--fg-bright); }

/* ---------- resume ---------- */

.timeline { display: flex; flex-direction: column; }
.timeline-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}
.timeline-date { font-family: var(--mono); font-size: 12px; color: var(--fg-dim); padding-top: 2px; }
.timeline-role { font-size: 17px; margin-bottom: 4px; color: var(--fg-bright); }
.timeline-org { font-size: 13px; color: var(--fg-tag); margin-bottom: 8px; }
.timeline-desc { font-size: 14px; color: var(--fg-mid); line-height: 1.65; }

/* ---------- footer ---------- */

.footer {
  margin-top: auto;
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--fg-dim);
}
.footer > div:first-child { display: flex; flex-direction: column; gap: 5px; }
.footer a { color: var(--fg-dim); text-decoration: none; transition: color 0.15s ease; }
.footer a:hover { color: var(--fg-bright); }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  main { padding: 48px 32px; }
  .project-grid { grid-template-columns: 1fr; }
  .content-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 700px) {
  .layout { flex-direction: column; }

  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    padding: 28px 24px 20px;
    border-right: none;
    border-bottom: 1px solid var(--line);
    gap: 20px;
  }
  .brand-sub { margin-bottom: 18px; }
  .nav-links { flex-direction: row; flex-wrap: wrap; gap: 4px; }
  .social-links { flex-direction: row; gap: 16px; }

  main { padding: 40px 24px; }
  .hero { font-size: 27px; }
  .now { flex-direction: column; gap: 8px; }
  .footer { flex-direction: column; gap: 10px; margin-top: 56px; }
  .content-grid { grid-template-columns: 1fr; }
  .timeline-row { grid-template-columns: 1fr; gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  .page.active { animation: none; }
  .project-card:hover { transform: none; }
}