:root {
  --paper: #f7f4ee;
  --ink: #111111;
  --muted: #5a564e;
  --accent: #ff6719;
  --line: #e6e0d6;
  --max: 40rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-optical-sizing: auto;
  font-weight: 450;
  line-height: 1.55;
  font-size: 1.05rem;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--ink); }
img { max-width: 100%; height: auto; display: block; }

.wrap { width: min(var(--max), calc(100% - 2.4rem)); margin: 0 auto; }
header.site {
  padding: 1.6rem 0 1.2rem;
  border-bottom: 1px solid var(--line);
}
.brand img { height: 42px; width: auto; }
nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.25rem;
  margin-top: 1rem;
  font-size: 0.92rem;
  font-weight: 550;
}
nav a { color: var(--ink); text-decoration: none; }
nav a:hover { color: var(--accent); }

/* Language switcher */
.lang-switcher {
  position: relative;
  display: inline-block;
}
.lang-switcher-toggle {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.4rem 0.7rem;
  font-size: 0.88rem;
  font-weight: 550;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: border-color 0.2s, background-color 0.2s;
}
.lang-switcher-toggle:hover {
  border-color: var(--accent);
  background: rgba(255, 103, 25, 0.05);
}
.lang-switcher-toggle svg {
  transition: transform 0.2s;
}
.lang-switcher-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}
.lang-switcher-menu {
  display: none;
  position: absolute;
  top: calc(100% + 0.3rem);
  right: 0;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  padding: 0.5rem 0;
  margin: 0;
  list-style: none;
  min-width: 180px;
  max-height: 400px;
  overflow-y: auto;
  z-index: 1000;
}
.lang-switcher-menu.show {
  display: block;
}
.lang-switcher-menu li {
  margin: 0;
}
.lang-switcher-menu a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.92rem;
  transition: background-color 0.15s;
}
.lang-switcher-menu a:hover {
  background: rgba(255, 103, 25, 0.08);
  color: var(--accent);
}
.lang-switcher-menu a.active {
  color: var(--accent);
  font-weight: 600;
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
header.site nav {
  flex: 1;
  margin: 0;
  justify-content: flex-end;
}

main { padding: 2.4rem 0 3.5rem; }
h1 {
  font-size: clamp(1.8rem, 4vw, 2.35rem);
  font-weight: 720;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 1rem;
}
h2 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 2.2rem 0 0.7rem;
}
p { margin: 0 0 1rem; }
.lead { font-size: 1.18rem; font-weight: 500; }
.muted { color: var(--muted); }

ul.plain {
  margin: 0 0 1.2rem;
  padding: 0;
  list-style: none;
}
ul.plain li {
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--line);
}
ul.plain li:last-child { border-bottom: 0; }

.note {
  margin: 1.6rem 0 0;
  padding: 0.9rem 0 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

footer.site {
  border-top: 1px solid var(--line);
  padding: 1.2rem 0 2.4rem;
  color: var(--muted);
  font-size: 0.88rem;
}
footer.site a { color: var(--muted); }

.bio {
  text-align: center;
  margin: 0 0 1.8rem;
}
.bio .mark {
  width: 96px;
  height: 96px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  overflow: hidden;
  background: var(--accent);
}
.bio .mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.bio .handle {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 550;
  margin: 0 0 0.7rem;
}
.stack {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin: 0 0 1.4rem;
}
a.stack-link {
  display: block;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  font-weight: 550;
  min-height: 44px;
}
a.stack-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}
a.stack-link small {
  display: block;
  font-weight: 450;
  color: var(--muted);
  margin-top: 0.15rem;
}

.exam {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 0.9rem 1rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
}
.exam:first-of-type { margin-top: 1.4rem; }
.exam h2 { margin: 0 0 0.25rem; font-size: 1.05rem; }
.exam-mark {
  width: 64px;
  height: 64px;
  border-radius: 50%;
}
.exam-meta {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 0 0 0.45rem;
}