@font-face {
  font-family: "Lilita One";
  src: url("LilitaOne-Regular.ttf") format("truetype");
  font-display: swap;
}

:root {
  --sea: #3FB2A6;
  --shallow: #5DC3B6;
  --land: #EFE6D6;
  --paper: #FBF8F2;
  --ink: #26313D;
  --ink-soft: #5A6573;
  --line: #E4DCCD;
  --accent: #2E6F72;
  --card: #FFFFFF;
}
@media (prefers-color-scheme: dark) {
  :root {
    --land: #1E2A2E;
    --paper: #162024;
    --ink: #EDE7DC;
    --ink-soft: #A9B2B8;
    --line: #2C3A3F;
    --accent: #7FD3C8;
    --card: #1C282C;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

/* top bar */
.bar { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
.brand span { font: 22px/1 "Lilita One", sans-serif; letter-spacing: .3px; }
.lang { display: flex; gap: 4px; background: var(--land); border-radius: 999px; padding: 3px; }
.lang button {
  border: 0; background: transparent; color: var(--ink-soft); font: inherit; font-size: 14px;
  padding: 4px 12px; border-radius: 999px; cursor: pointer;
}
.lang button[aria-pressed="true"] { background: var(--card); color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,.08); }

/* home hero */
.hero {
  background: linear-gradient(180deg, var(--sea) 0%, var(--shallow) 100%);
  color: #fff; text-align: center; padding: 64px 20px 72px;
}
.hero img { width: 132px; height: 132px; border-radius: 30px; box-shadow: 0 12px 32px rgba(20,60,60,.28); }
.hero h1 { font: 64px/1.05 "Lilita One", sans-serif; margin: 26px 0 10px; letter-spacing: .5px; }
.hero p { font-size: 19px; margin: 0 auto; max-width: 520px; opacity: .95; }
.soon {
  display: inline-block; margin-top: 26px; padding: 10px 22px; border-radius: 999px;
  background: rgba(255,255,255,.18); font-size: 15px;
}

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: 40px 0; }
.feature { background: var(--card); border-radius: 16px; padding: 20px; }
.feature h3 { margin: 0 0 6px; font-size: 17px; }
.feature p { margin: 0; color: var(--ink-soft); font-size: 15px; }

.links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin: 8px 0 48px; }
.links a { background: var(--land); color: var(--ink); padding: 12px 22px; border-radius: 999px; }
.links a:hover { text-decoration: none; filter: brightness(.97); }

/* document pages */
.doc h1 { font-size: 34px; line-height: 1.2; margin: 28px 0 6px; }
.doc .meta { color: var(--ink-soft); font-size: 14px; margin: 0 0 28px; }
.doc h2 { font-size: 20px; margin: 34px 0 8px; }
.doc p, .doc li { color: var(--ink); }
.doc ul { padding-left: 1.2em; }
.doc li { margin: 4px 0; }
.box { background: var(--card); border-radius: 16px; padding: 18px 20px; margin: 18px 0; }
.box p { margin: 0; }
.qa { background: var(--card); border-radius: 16px; padding: 16px 20px; margin: 10px 0; }
.qa h3 { margin: 0 0 4px; font-size: 16px; }
.qa p { margin: 0; color: var(--ink-soft); font-size: 15px; }

footer { color: var(--ink-soft); font-size: 13px; text-align: center; padding: 36px 20px 48px; }
footer a { color: var(--ink-soft); }

/* language switching */
html[lang^="zh"] [lang="en"], html[lang="en"] [lang="zh"] { display: none !important; }

@media (max-width: 520px) {
  body { font-size: 16px; }
  .hero { padding: 48px 16px 56px; }
  .hero h1 { font-size: 46px; }
  .wrap { padding: 0 16px; }
  .doc h1 { font-size: 28px; }
}