:root {
  --teal: #48C1A8;
  --teal-dark: #05AEA9;
  --ink: #2C2E33;
  --muted: #6b7177;
  --line: #ECEEF0;
  --bg: #ffffff;
  --bg-soft: #f6f7f8;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg-soft);
  line-height: 1.7;
}

.bar {
  background: var(--teal-dark);
  color: #fff;
  padding: 18px 20px;
}
.bar-inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand { font-weight: 700; font-size: 18px; letter-spacing: 0.2px; }
.brand a { color: #fff; text-decoration: none; }

.langtoggle { display: flex; gap: 6px; }
.langtoggle button {
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: transparent;
  color: #fff;
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 13px;
  cursor: pointer;
}
.langtoggle button.active { background: #fff; color: var(--teal-dark); border-color: #fff; font-weight: 700; }

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 64px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 24px;
  margin-bottom: 16px;
}

h1 { font-size: 26px; margin: 4px 0 2px; }
h2 { font-size: 19px; margin: 26px 0 6px; }
h3 { font-size: 16px; margin: 18px 0 4px; }
p, li { color: #3a3f44; }
.meta { color: var(--muted); font-size: 13px; margin-top: 0; }
a { color: var(--teal-dark); }
ul { padding-left: 20px; }
.links a {
  display: inline-block;
  margin-right: 16px;
  font-weight: 600;
}
footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 48px;
  color: var(--muted);
  font-size: 13px;
}

/* Language switching: show only the active language */
body[data-lang="en"] [lang="ja"] { display: none; }
body[data-lang="ja"] [lang="en"] { display: none; }