:root {
  --bg: #f4fbf6;
  --surface: #ffffff;
  --ink: #0c3a1d;
  --ink-soft: #3d5c47;
  --accent: #1f9d4a;
  --accent-bg: #5ce07a;
  --border: #d9efe0;
  --mono: "SF Mono", "Menlo", "Consolas", monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b160e;
    --surface: #12211a;
    --ink: #eafbee;
    --ink-soft: #a9c9b2;
    --accent: #6be08c;
    --accent-bg: #16321f;
    --border: #1e3527;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans SC", "Noto Sans TC", "Noto Sans KR", "Yu Gothic", sans-serif;
  line-height: 1.8;
}
a { color: var(--accent); }
.langbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.9rem;
  max-width: 40rem;
  margin: 0 auto;
  padding: 0.9rem 1.5rem 0;
  font-size: 0.82rem;
}
.langbar a {
  color: var(--ink-soft);
  text-decoration: none;
}
.langbar a.current {
  color: var(--ink);
  font-weight: 600;
  text-decoration: underline;
}
.langbar a:hover { color: var(--accent); }

/* ---- index (top) page ---- */
header.hero {
  padding: 3rem 1.5rem 3rem;
  text-align: center;
}
.icon {
  width: 84px;
  height: 84px;
  border-radius: 20px;
  background: var(--accent-bg);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.7rem;
  margin: 0 auto 1.25rem;
}
h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin: 0 0 0.5rem;
  text-wrap: balance;
}
.tagline {
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 34rem;
  margin: 0 auto;
}
main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
}
main.doc { padding-top: 2.5rem; }
section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem;
  margin-bottom: 1.25rem;
}
section h2 { font-size: 1.05rem; margin: 0 0 0.6rem; }
section p { margin: 0; color: var(--ink-soft); }
.features { display: grid; gap: 0.9rem; }
.feature { display: flex; gap: 0.75rem; align-items: baseline; }
.feature .mark { font-family: var(--mono); color: var(--accent); flex-shrink: 0; }
footer {
  text-align: center;
  padding: 2rem 1.5rem 3rem;
  color: var(--ink-soft);
  font-size: 0.85rem;
}
footer a { color: var(--ink-soft); margin: 0 0.6rem; }
footer a:hover { color: var(--accent); }

/* ---- privacy / support pages ---- */
h1.doc-title { font-size: 1.6rem; margin-bottom: 0.3rem; }
.updated { color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 2.5rem; }
h2.doc-h2 { font-size: 1.1rem; margin-top: 2.2rem; }
main.doc p, main.doc li { color: var(--ink-soft); }
main.doc ul { padding-left: 1.3rem; }
.box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-top: 0.75rem;
}
.mail { font-family: var(--mono); font-size: 1.05rem; color: var(--ink); }
.back { display: inline-block; margin: 1.5rem 0 1rem; font-size: 0.9rem; }
code {
  font-family: var(--mono);
  background: var(--border);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
}