:root {
  --bg: #f4f1e8;
  --bg-2: #efeadd;
  --card: #fffdf8;
  --ink: #2f342a;
  --ink-soft: #6b7161;
  --moss: #5f7a4e;
  --moss-deep: #435c37;
  --blush: #c47b83;
  --line: #e7e2d4;
  --chip: #eef1e6;
  --shadow: 0 6px 24px rgba(63, 74, 45, .07);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12140d;
    --bg-2: #171a10;
    --card: #1c1f16;
    --ink: #e9eae0;
    --ink-soft: #a3a897;
    --moss: #9fc189;
    --moss-deep: #bcd6a6;
    --blush: #d99aa1;
    --line: #2b3022;
    --chip: #232a1b;
    --shadow: 0 8px 30px rgba(0, 0, 0, .35);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1100px 520px at 50% -8%, var(--bg-2), transparent 60%),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* language visibility */
:root[data-lang="en"] .zh { display: none !important; }
:root[data-lang="zh"] .en { display: none !important; }

.wrap { max-width: 660px; margin: 0 auto; padding: 34px 22px 72px; }

/* language toggle */
.langbar { display: flex; justify-content: flex-end; margin-bottom: 8px; }
.toggle {
  border: 1px solid var(--line); background: var(--card);
  border-radius: 999px; padding: 5px; display: inline-flex; gap: 2px;
  box-shadow: var(--shadow);
}
.toggle button {
  border: 0; background: transparent; color: var(--ink-soft);
  font: inherit; font-size: 13px; padding: 5px 14px; border-radius: 999px;
  cursor: pointer; transition: .18s;
}
.toggle button.active { background: var(--moss); color: #fff; }

/* hero */
header.hero { text-align: center; padding: 20px 0 30px; }
.app-icon {
  width: 88px; height: 88px; margin: 0 auto 18px;
  border-radius: 22px;
  background: linear-gradient(160deg, #7d9b68, #4c6a3d 88%);
  display: flex; align-items: center; justify-content: center;
  font-size: 46px; line-height: 1;
  box-shadow: 0 10px 26px rgba(67, 92, 55, .32), inset 0 1px 0 rgba(255,255,255,.25);
}
h1 {
  font-family: Georgia, "Times New Roman", "Songti SC", "Noto Serif CJK SC", serif;
  font-size: 30px; font-weight: 600; letter-spacing: .2px;
  margin: 0 0 6px; color: var(--moss-deep);
}
.tagline { color: var(--ink-soft); font-size: 15px; margin: 0; }
.leaf { color: var(--moss); opacity: .5; margin: 20px auto 0; display: block; }

/* cards */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px 26px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}
.card.intro { text-align: center; }
.sec-icon {
  width: 40px; height: 40px; border-radius: 12px; background: var(--chip);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 20px; margin-bottom: 12px;
}
h2 {
  font-family: Georgia, "Times New Roman", "Songti SC", "Noto Serif CJK SC", serif;
  font-size: 20px; font-weight: 600; color: var(--moss-deep); margin: 0 0 10px;
}
p { margin: 0 0 12px; }
p:last-child { margin-bottom: 0; }
strong { color: var(--ink); font-weight: 600; }
.card.intro p { font-size: 16px; }

/* pills */
.pills { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.pill {
  background: var(--chip); color: var(--moss-deep);
  border-radius: 999px; padding: 5px 14px; font-size: 13px; font-weight: 500;
}

/* lists */
ul { margin: 4px 0 0; padding: 0; list-style: none; }
li { position: relative; padding-left: 22px; margin-bottom: 14px; }
li:last-child { margin-bottom: 0; }
li::before {
  content: "🌱"; position: absolute; left: 0; top: 0; font-size: 13px;
}
li.q::before { content: "•"; color: var(--blush); font-size: 18px; left: 4px; top: -2px; }

a { color: var(--moss); text-decoration: none; border-bottom: 1px solid transparent; }
a:hover { border-bottom-color: var(--moss); }

.updated { color: var(--ink-soft); font-size: 12.5px; text-align: center; margin: 18px 0 0; }

nav.links { text-align: center; margin-top: 28px; }
nav.links a { margin: 0 12px; font-size: 14px; color: var(--ink-soft); }
nav.links a:hover { color: var(--moss); border-bottom-color: transparent; }
footer { text-align: center; color: var(--ink-soft); font-size: 12px; margin-top: 26px; letter-spacing: .3px; }

@media (max-width: 480px) {
  .wrap { padding: 26px 16px 60px; }
  .card { padding: 20px 20px; }
  h1 { font-size: 26px; }
}