:root {
  --bg: #f4f0ea;
  --bg-elev: #fffdf8;
  --ink: #17141f;
  --muted: #5d5668;
  --faint: #8a8394;
  --line: #e4ddd2;
  --accent: #7c3aed;
  --accent-soft: rgba(124, 58, 237, 0.1);
  --ok: #1f7a4d;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --display: "Iowan Old Style", "Songti SC", Palatino, "PingFang SC", serif;
  --max: 46rem;
  --wide: 64rem;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 40% at 10% -10%, rgba(124, 58, 237, 0.12), transparent 50%),
    var(--bg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
}

html[data-lang="en"] .zh { display: none !important; }
html[data-lang="zh"] .en { display: none !important; }

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

a:hover { opacity: 0.85; }

img { max-width: 100%; height: auto; }

.wrap {
  width: min(var(--wide), calc(100% - 2rem));
  margin-inline: auto;
}

.narrow { width: min(var(--max), calc(100% - 2rem)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: rgba(244, 240, 234, 0.86);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 3.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: inherit;
  text-decoration: none;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.25rem 1rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.92rem;
}

.nav a[aria-current="page"] { font-weight: 650; }

.lang {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--bg-elev);
}

.lang button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.78rem;
  padding: 0.28rem 0.6rem;
  cursor: pointer;
}

.lang button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg-elev);
}

.hero {
  padding: 3.5rem 0 2.5rem;
  display: grid;
  gap: 2rem;
}

@media (min-width: 880px) {
  .hero {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    padding-top: 4.5rem;
  }
}

.eyebrow {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  font-family: var(--display);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0.35rem 0 1rem;
  font-weight: 600;
}

.lede {
  font-size: 1.12rem;
  color: var(--muted);
  max-width: 36rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.75rem;
  padding: 0 1.1rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--ink);
  color: #fff;
}

.btn-ghost {
  background: var(--bg-elev);
  color: var(--ink);
  border: 1px solid var(--line);
}

.pair-art {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  padding: 1.25rem;
  box-shadow: 0 18px 40px rgba(23, 20, 31, 0.06);
}

.pair-art svg { width: 100%; height: auto; display: block; }

.section {
  padding: 2.5rem 0;
}

.section h2 {
  font-family: var(--display);
  font-size: 1.7rem;
  margin: 0 0 1.25rem;
}

.steps {
  display: grid;
  gap: 1rem;
}

@media (min-width: 800px) {
  .steps { grid-template-columns: repeat(3, 1fr); }
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.2rem 1.25rem;
}

.step-n {
  display: inline-flex;
  width: 1.7rem;
  height: 1.7rem;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.65rem;
}

.card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.cmd {
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
  margin-top: 0.85rem;
  background: #17141f;
  color: #f4f0ea;
  border-radius: 0.7rem;
  overflow: hidden;
  font-family: var(--mono);
  font-size: 0.78rem;
}

.cmd code {
  display: block;
  padding: 0.85rem 0.95rem;
  overflow-x: auto;
  white-space: nowrap;
}

.cmd button {
  appearance: none;
  border: 0;
  background: transparent;
  color: #d6c6ff;
  cursor: pointer;
  padding: 0 0.9rem;
  font: inherit;
  font-size: 0.72rem;
}

.cmd button[data-copied="1"] { color: #8de0b3; }

.features {
  display: grid;
  gap: 0.85rem;
}

@media (min-width: 700px) {
  .features { grid-template-columns: 1fr 1fr; }
}

.features li {
  list-style: none;
  margin: 0;
  padding: 1rem 1.1rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
}

.features ul { margin: 0; padding: 0; display: contents; }

.features strong { display: block; margin-bottom: 0.2rem; }

.features span { color: var(--muted); font-size: 0.92rem; }

.plan {
  display: grid;
  gap: 1rem;
}

@media (min-width: 700px) {
  .plan { grid-template-columns: 1fr 1fr; }
}

.plan .card h3 { font-size: 1.15rem; }

.note {
  font-size: 0.92rem;
  color: var(--muted);
  border-left: 3px solid var(--accent);
  padding: 0.2rem 0 0.2rem 1rem;
  margin-top: 1.5rem;
}

.legal h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-top: 2.5rem;
}

.meta {
  color: var(--faint);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.legal h2 {
  font-family: var(--sans);
  font-size: 1.15rem;
  margin: 2rem 0 0.6rem;
}

.legal p, .legal li { color: var(--ink); }

.legal ul { padding-left: 1.2rem; }

.legal li { margin: 0.35rem 0; }

.faq details {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 0.9rem 1.1rem;
  margin-bottom: 0.7rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 650;
}

.faq details p {
  margin: 0.7rem 0 0.2rem;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 3rem;
  padding: 1.5rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.25rem;
  justify-content: space-between;
}

.site-footer nav { display: flex; gap: 1rem; flex-wrap: wrap; }

.site-footer a { color: inherit; text-decoration: none; }

.site-footer a:hover { color: var(--accent); }