:root {
  --paper: #faf9f6;
  --ink: #1d2433;
  --ink-2: #5b6478;
  --line: #e6e3da;
  --teal: #0e8f86;
  --teal-deep: #0a6b64;
  --coral: #e0604a;
  --tile: #f1efe8;
  --card: #ffffff;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #10141f; --ink: #eaedf6; --ink-2: #9aa3ba; --line: #272e42;
    --teal: #3fc2b8; --teal-deep: #63d4cb; --coral: #f08a72;
    --tile: #181e2e; --card: #1a2134;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", -apple-system, sans-serif;
  line-height: 1.6; font-size: 17px;
}
a { color: var(--teal-deep); }
h1, h2, h3 { line-height: 1.18; text-wrap: balance; }

header.site {
  display: flex; align-items: center; gap: 26px; max-width: 1020px;
  margin: 0 auto; padding: 20px 24px;
}
.logo { font-weight: 800; font-size: 1.2rem; text-decoration: none; color: var(--ink); }
.logo .zh { color: var(--teal); }
header.site nav { display: flex; gap: 20px; margin-left: auto; align-items: center; }
header.site nav a { color: var(--ink-2); text-decoration: none; font-size: .92rem; font-weight: 500; }
header.site nav a:hover { color: var(--ink); }

.btn {
  display: inline-block; background: var(--teal); color: #fff; border: 0;
  padding: 13px 26px; border-radius: 10px; font-size: 1rem; font-weight: 650;
  cursor: pointer; text-decoration: none; transition: .15s;
}
.btn:hover { filter: brightness(1.07); }
.btn.small { padding: 9px 18px; font-size: .88rem; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }

main { max-width: 1020px; margin: 0 auto; padding: 0 24px 90px; }
section { margin: 84px 0; }

.hero { display: flex; gap: 48px; align-items: center; margin-top: 42px; flex-wrap: wrap; }
.hero > div { flex: 1; min-width: 300px; }
.hero h1 { font-size: 2.7rem; margin: 0 0 16px; font-weight: 750; }
.hero p.lede { font-size: 1.18rem; color: var(--ink-2); max-width: 34em; }
.hero .cta-row { display: flex; gap: 14px; margin-top: 26px; align-items: center; flex-wrap: wrap; }
.hero .cta-note { color: var(--ink-2); font-size: .84rem; }

/* CSS mock of the app */
.mock {
  background: #141931; border-radius: 18px; padding: 26px; color: #eef1fb;
  box-shadow: 0 24px 60px rgba(15, 25, 60, .25); max-width: 400px; margin: 0 auto;
}
.mock .m-tag { color: #ff8a75; font-size: .68rem; letter-spacing: 1.6px; text-transform: uppercase; font-weight: 700; }
.mock .m-hz { font-size: 2.6rem; font-weight: 700; margin: 12px 0 2px; }
.mock .m-py { color: #4ecdc4; font-size: 1.15rem; }
.mock .m-en { color: #9aa3c4; margin-top: 6px; }
.mock .m-row { display: flex; gap: 10px; margin-top: 20px; }
.mock .m-btn { border-radius: 9px; padding: 9px 16px; font-size: .85rem; font-weight: 600; }
.mock .m-play { background: #223; color: #4ecdc4; border: 1px solid #2c3457; }
.mock .m-good { background: #36d399; color: #04331f; }
.mock .m-again { background: #f87272; color: #fff; }

.eyebrow { text-transform: uppercase; letter-spacing: 2.4px; font-size: .72rem; color: var(--teal); font-weight: 700; margin-bottom: 8px; }
section h2 { font-size: 1.75rem; margin: 0 0 14px; }
.sub { color: var(--ink-2); max-width: 44em; }

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; margin-top: 30px; }
.step { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.step .n {
  width: 34px; height: 34px; border-radius: 10px; background: var(--tile); color: var(--teal);
  display: grid; place-items: center; font-weight: 800; margin-bottom: 12px;
}
.step h3 { margin: 0 0 8px; font-size: 1.05rem; }
.step p { margin: 0; color: var(--ink-2); font-size: .93rem; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; margin-top: 30px; }
.feature { border-left: 3px solid var(--teal); padding: 4px 0 4px 18px; }
.feature h3 { margin: 0 0 6px; font-size: 1.02rem; }
.feature p { margin: 0; color: var(--ink-2); font-size: .92rem; }

.price-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 20px;
  padding: 40px; max-width: 520px; margin: 30px auto 0; text-align: center;
  box-shadow: 0 16px 48px rgba(20, 30, 60, .07);
}
.price-card .badge {
  display: inline-block; background: var(--coral); color: #fff; font-size: .72rem;
  font-weight: 700; letter-spacing: 1.4px; text-transform: uppercase;
  padding: 4px 12px; border-radius: 99px; margin-bottom: 14px;
}
.price-card .amount { font-size: 3rem; font-weight: 800; }
.price-card .amount small { font-size: 1rem; color: var(--ink-2); font-weight: 500; }
.price-card ul { text-align: left; margin: 22px auto; max-width: 26em; padding-left: 22px; color: var(--ink-2); }
.price-card ul li { margin: 7px 0; }

dialog {
  border: 1px solid var(--line); border-radius: 16px; padding: 32px; max-width: 430px;
  background: var(--card); color: var(--ink);
}
dialog::backdrop { background: rgba(10, 14, 25, .55); }
dialog h3 { margin-top: 0; }
.email-row { display: flex; gap: 10px; margin: 18px 0 8px; flex-wrap: wrap; }
.email-row input {
  flex: 1; min-width: 200px; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--line); font-size: 1rem; background: var(--paper); color: var(--ink);
}
.email-row input:focus { outline: 2px solid var(--teal); border-color: transparent; }
.form-note { font-size: .8rem; color: var(--ink-2); }
.form-ok { color: var(--teal-deep); font-weight: 650; }

.faq details { border-bottom: 1px solid var(--line); padding: 14px 0; }
.faq summary { font-weight: 650; cursor: pointer; }
.faq p { color: var(--ink-2); margin: 10px 0 4px; }

footer.site {
  border-top: 1px solid var(--line); color: var(--ink-2); font-size: .85rem;
  max-width: 1020px; margin: 0 auto; padding: 26px 24px 60px;
  display: flex; gap: 22px; flex-wrap: wrap;
}
footer.site a { color: var(--ink-2); }

/* blog */
article.post { max-width: 680px; margin: 40px auto 0; }
article.post h1 { font-size: 2.1rem; }
article.post .postmeta { color: var(--ink-2); font-size: .85rem; margin-bottom: 26px; }
article.post h2 { font-size: 1.3rem; margin-top: 38px; }
article.post p, article.post li { max-width: 66ch; }
article.post blockquote {
  border-left: 3px solid var(--teal); margin: 20px 0; padding: 4px 18px;
  color: var(--ink-2); font-style: italic;
}
.post-list { display: grid; gap: 18px; margin-top: 30px; }
.post-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; text-decoration: none; color: var(--ink); transition: .15s;
}
.post-card:hover { border-color: var(--teal); }
.post-card h3 { margin: 0 0 6px; }
.post-card p { margin: 0; color: var(--ink-2); font-size: .92rem; }
.cta-box {
  background: var(--tile); border-radius: var(--radius); padding: 26px; margin-top: 44px;
}
.cta-box h3 { margin-top: 0; }
@media (max-width: 640px) { .hero h1 { font-size: 2.1rem; } }