*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #ffffff;
  --surface: #f9f9f9;
  --border: #e5e5e5;
  --text: #1a1a1a;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --tab-active-bg: #ffffff;
  --radius: 8px;
  --max-width: 760px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Layout ── */
header {
  border-bottom: 1px solid var(--border);
  padding: 2rem 1.5rem 0;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  color: var(--text);
}

/* ── Tab nav ── */
nav {
  display: flex;
  gap: 0;
  margin-bottom: -1px;
}

.tab-btn {
  background: none;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.55rem 1.1rem;
  transition: color 0.15s, background 0.15s;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.active {
  background: var(--tab-active-bg);
  border-color: var(--border);
  color: var(--accent);
}

/* ── Main content ── */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ── Typography ── */
h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
  margin-top: 2rem;
  color: var(--text);
}

h2:first-child {
  margin-top: 0;
}

p {
  color: var(--muted);
  margin-bottom: 1rem;
  max-width: 60ch;
}

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

a:hover {
  text-decoration: underline;
}

/* ── Home ── */
.home-tagline {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.home-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.35rem 0.9rem;
  transition: border-color 0.15s, color 0.15s;
}

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

/* ── Info ── */
.info-grid {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 0.5rem 1.5rem;
  font-size: 0.9rem;
}

.info-label {
  color: var(--muted);
  font-weight: 500;
  padding-top: 0.1rem;
}

.info-value {
  color: var(--text);
}

/* ── Education ── */
.edu-list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.edu-item {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.edu-year {
  flex-shrink: 0;
  width: 3.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  padding-top: 0.1rem;
  text-align: right;
}

.edu-body {
  border-left: 2px solid var(--border);
  padding-left: 1.25rem;
  position: relative;
  flex: 1;
}

.edu-body::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  position: absolute;
  left: -5px;
  top: 6px;
}

.edu-degree {
  font-weight: 600;
  font-size: 0.95rem;
}

.edu-school {
  color: var(--accent);
  font-size: 0.9rem;
  margin-top: 0.1rem;
}

.edu-desc {
  color: var(--muted);
  font-size: 0.88rem;
  max-width: 56ch;
  margin-top: 0.35rem;
  margin-bottom: 0;
}

/* ── Experience ── */
.exp-list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.exp-item {
  border-left: 2px solid var(--border);
  padding-left: 1.25rem;
  position: relative;
}

.exp-item::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  position: absolute;
  left: -5px;
  top: 6px;
}

.exp-role {
  font-weight: 600;
  font-size: 0.95rem;
}

.exp-company {
  color: var(--accent);
  font-size: 0.9rem;
}

.exp-dates {
  color: var(--muted);
  font-size: 0.82rem;
  margin-top: 0.15rem;
  margin-bottom: 0.4rem;
}

.exp-desc {
  color: var(--muted);
  font-size: 0.88rem;
  max-width: 56ch;
  margin-bottom: 0;
}

/* ── Projects ── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.project-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.project-card:hover {
  border-color: #c7d2fe;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.07);
}

.project-name {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.project-desc {
  color: var(--muted);
  font-size: 0.86rem;
  margin-bottom: 0.75rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--muted);
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 4rem;
  padding: 1.5rem;
  text-align: center;
}