:root {
  --bg: #0f1115;
  --card: #151922;
  --text: #e6e7ea;
  --muted: #9aa3b2;
  --accent: #6ea8fe;
  --border: #232a36;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans JP", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.hero {
  padding: 48px 20px 28px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #121521 0%, #0f1115 70%);
}

.hero-main {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
}

h1 {
  margin: 0 0 6px;
  font-size: 36px;
  letter-spacing: 0.5px;
}

.subtitle {
  margin: 0 0 6px;
  color: var(--muted);
}

.meta { color: var(--muted); font-size: 12px; }

.toggle { display: flex; gap: 10px; }
.toggle button {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
}
.toggle button.active {
  background: var(--accent);
  color: #0d1117;
  border-color: var(--accent);
}

.contact {
  max-width: 980px;
  margin: 18px auto 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px 16px;
  font-size: 14px;
}

.label {
  color: var(--muted);
  margin-right: 6px;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

section { margin-bottom: 40px; }

h2 {
  margin: 0 0 16px;
  font-size: 22px;
  border-left: 4px solid var(--accent);
  padding-left: 10px;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
}

.card h3 { margin-top: 0; font-size: 16px; }

.timeline .item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--border);
}

.timeline .item:last-child { border-bottom: none; }

.time { color: var(--muted); font-size: 14px; }

footer {
  border-top: 1px solid var(--border);
  padding: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

.lang { display: none; }
body[data-lang="ja"] .lang-ja { display: block; }
body[data-lang="zh"] .lang-zh { display: block; }

@media (max-width: 720px) {
  .timeline .item { grid-template-columns: 1fr; }
}