:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1b1b1b;
  --muted: #5b5b5b;
  --line: #dddddd;
  --link: #0b5fae;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --fg: #e8e8e8;
    --muted: #a2a2a2;
    --line: #33373b;
    --link: #6fb2ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "Apple SD Gothic Neo", "Malgun Gothic", Arial, sans-serif;
  line-height: 1.65;
}

a { color: var(--link); }
img { max-width: 100%; display: block; }

/* ---- layout: sidebar + content ---- */

.layout {
  display: flex;
  align-items: flex-start;
}

.sidebar {
  flex: 0 0 240px;
  width: 240px;
  padding: 32px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
}

.sidebar .avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  margin-bottom: 14px;
}

.sidebar h1 { font-size: 1.2rem; margin: 0 0 8px; line-height: 1.3; }
.sidebar h1 .en-name { font-weight: 400; color: var(--muted); font-size: 0.95rem; }
.sidebar .tagline { color: var(--muted); font-size: 0.9rem; margin: 0 0 20px; }

.sidebar nav { display: flex; flex-direction: column; gap: 6px; margin-bottom: 20px; }
.sidebar nav a { font-size: 0.9rem; }

.sidebar .social { display: flex; flex-direction: column; gap: 6px; margin-bottom: 20px; font-size: 0.9rem; }

.sidebar .lang { display: inline-block; font-size: 0.85rem; margin-top: auto; padding-top: 20px; }

.content {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px 60px;
}

/* ---- content sections ---- */

.content section {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.content section > h2 { font-size: 1.3rem; margin: 0 0 16px; }
.content section > p.lede { color: var(--muted); margin-top: -8px; margin-bottom: 20px; }

article.card { margin-bottom: 24px; }
article.card h3 { margin: 0 0 4px; font-size: 1.05rem; }
article.card .meta { color: var(--muted); font-size: 0.9rem; margin-bottom: 8px; }
article.card .links a { margin-right: 12px; font-size: 0.9rem; }

ul.plain { padding-left: 1.1em; margin: 0.4em 0; }
ul.plain li { margin-bottom: 6px; }

ul.compact-list { padding-left: 1.1em; margin: 0.4em 0; }
ul.compact-list li { margin-bottom: 4px; font-size: 0.95rem; }

.skill-grid { display: grid; grid-template-columns: repeat(2, minmax(200px, 1fr)); gap: 20px; }
.skill-grid h3 { font-size: 1rem; margin: 0 0 6px; }

table.lang-table { border-collapse: collapse; }
table.lang-table td, table.lang-table th {
  border: 1px solid var(--line);
  padding: 6px 14px;
  text-align: left;
}

footer { color: var(--muted); font-size: 0.85rem; }

/* ---- mobile: stack into one column ---- */

@media (max-width: 720px) {
  .layout { flex-direction: column; }

  .sidebar {
    position: static;
    height: auto;
    overflow-y: visible;
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .sidebar nav { flex-direction: row; flex-wrap: wrap; gap: 4px 14px; }
  .sidebar .social { flex-direction: row; flex-wrap: wrap; gap: 4px 14px; }

  .content { max-width: none; padding: 24px 20px 48px; }

  .skill-grid { grid-template-columns: 1fr; }
}