:root {
  --bg: #F4F5FA;
  --surface: #FFFFFF;
  --border: #E2E4EF;
  --ink: #0E1330;
  --ink-2: #2A3050;
  --muted: #4A5070;
  --brand: #2B3BB0;
  --brand-hover: #1A2577;
  --accent: #C43D1E;
  --accent-hover: #A8331A;
  --hero: #121A4A;
  --hero-ink-2: #C9CEF0;
  --hero-ink-3: #A9B0DE;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-strong: rgba(255, 255, 255, 0.16);
  --glass-border: rgba(255, 255, 255, 0.18);
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0B0F26;
    --surface: #141A3A;
    --border: #262E5A;
    --ink: #EEF0FA;
    --ink-2: #D3D7EE;
    --muted: #A9B0DE;
    --brand: #9AA6FF;
    --brand-hover: #C2C9FF;
    --hero: #0E1440;
  }
}
:root[data-theme="dark"] {
  --bg: #0B0F26; --surface: #141A3A; --border: #262E5A; --ink: #EEF0FA; --ink-2: #D3D7EE;
  --muted: #A9B0DE; --brand: #9AA6FF; --brand-hover: #C2C9FF; --hero: #0E1440;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); }
a:hover { color: var(--brand-hover); }
code { font-family: var(--mono); font-size: 0.92em; }
.wrap { max-width: 1160px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }

/* Hero */
.hero { background: var(--hero); color: #fff; padding-bottom: 96px; overflow: hidden; }
.nav { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; padding-top: 20px; padding-bottom: 20px; }
.brand { display: flex; align-items: center; gap: 12px; color: #fff; text-decoration: none; font-weight: 600; font-size: 17px; }
.brand:hover { color: #fff; }
.brand img { border-radius: 8px; }
.nav-links { display: flex; flex-wrap: wrap; gap: 4px; font-size: 15px; }
.nav-links a { color: var(--hero-ink-2); text-decoration: none; padding: 10px 12px; border-radius: 10px; }
.nav-links a:hover { color: #fff; background: var(--glass); }

.hero-body { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 24px; padding-top: 64px; }
.hero-icon { width: 128px; height: 128px; border-radius: 28px; box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35); }
h1 { margin: 0; font-size: clamp(38px, 7vw, 64px); line-height: 1.1; font-weight: 700; letter-spacing: -0.02em; }
.lead { margin: 0; max-width: 680px; font-size: clamp(17px, 2.4vw, 21px); color: var(--hero-ink-2); }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 8px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 12px 28px; border-radius: 999px; font-weight: 600; font-size: 17px; text-decoration: none; transition: background .15s, transform .15s; }
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-ghost { color: #fff; background: var(--glass); border: 1px solid rgba(255, 255, 255, 0.28); font-weight: 500; }
.btn-ghost:hover { color: #fff; background: var(--glass-strong); }
.meta { margin: 0; font-size: 14px; color: var(--hero-ink-3); }

/* App window mockup */
.window {
  width: 100%; max-width: 1040px; margin-top: 48px; text-align: left;
  border-radius: 22px; background: rgba(255, 255, 255, 0.10); border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  -webkit-backdrop-filter: blur(24px) saturate(160%); backdrop-filter: blur(24px) saturate(160%);
  overflow: hidden;
}
.titlebar { display: flex; align-items: center; gap: 8px; padding: 14px 18px; border-bottom: 1px solid rgba(255, 255, 255, 0.14); font-size: 13px; color: var(--hero-ink-2); }
.titlebar i { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.titlebar .r { background: #FF5F57; } .titlebar .y { background: #FEBC2E; } .titlebar .g { background: #28C840; }
.titlebar span { margin-left: 16px; }
.panes { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr); min-height: 420px; }
.pane { padding: 18px; display: flex; flex-direction: column; gap: 8px; font-size: 14px; }
.pane b { font-size: 12px; color: var(--hero-ink-3); font-weight: 600; }
.side { border-right: 1px solid rgba(255, 255, 255, 0.14); }
.side span { padding: 8px 12px; color: var(--hero-ink-2); border-radius: 10px; }
.side .sel { background: var(--glass-strong); color: #fff; }
.log { border-left: 1px solid rgba(255, 255, 255, 0.14); font-size: 13px; }
.log code { color: #E6E8F7; }
.log .ok { color: #8DE0A8; }
.stage { align-items: center; justify-content: center; padding: 28px; }
.phone { width: 180px; height: 364px; border-radius: 36px; border: 6px solid #0B0F2A; background: #2B3BB0; position: relative; }
.touch { position: absolute; right: 30px; bottom: 120px; width: 44px; height: 44px; border-radius: 50%; background: #F0603F; box-shadow: 0 0 0 10px rgba(240, 96, 63, 0.28); }

/* Sections */
.section { padding-top: 64px; padding-bottom: 32px; }
#features { padding-top: 96px; }
h2 { margin: 0 0 12px; font-size: clamp(28px, 4vw, 40px); line-height: 1.2; letter-spacing: -0.01em; }
.sub { margin: 0 0 40px; font-size: 18px; color: var(--muted); max-width: 720px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 24px; }
.card h3 { margin: 6px 0 6px; font-size: 20px; }
.card p { margin: 0; font-size: 15px; color: var(--muted); }
.tag { font-size: 13px; font-weight: 600; color: var(--brand); }
.num { font-size: 28px; font-weight: 700; color: var(--accent); }
#install h2 { margin-bottom: 32px; }

.agent { background: var(--hero); color: #fff; border-radius: 28px; padding: clamp(24px, 5vw, 48px); display: flex; flex-wrap: wrap; gap: 40px; }
.agent-text { flex: 1 1 340px; display: flex; flex-direction: column; gap: 16px; }
.agent-text h2 { margin: 0; }
.agent-text p, .agent-text ul { margin: 0; font-size: 16px; color: var(--hero-ink-2); }
.agent-text ul { padding-left: 20px; display: flex; flex-direction: column; gap: 6px; font-size: 15px; }
.agent-text code { color: #fff; }
.tag-accent { color: #FF8A6E; }
.agent-code { flex: 1 1 460px; min-width: 0; display: flex; flex-direction: column; gap: 10px; }
.code-head { display: flex; align-items: center; justify-content: space-between; font-size: 13px; color: var(--hero-ink-3); margin-top: 4px; }
.copy { font: inherit; font-size: 13px; color: #fff; background: var(--glass); border: 1px solid var(--glass-border); border-radius: 8px; padding: 6px 12px; min-height: 32px; cursor: pointer; }
.copy:hover { background: var(--glass-strong); }
pre, .prompt {
  margin: 0; padding: 16px 18px; border-radius: 14px; background: var(--glass); border: 1px solid var(--glass-border);
  font-size: 13px; line-height: 1.6; color: #E6E8F7;
}
pre { font-family: var(--mono); white-space: pre-wrap; word-break: break-all; }
.prompt { font-size: 15px; }

.two { display: flex; flex-wrap: wrap; gap: 20px; padding-bottom: 64px; }
.big { flex: 1 1 420px; padding: 32px; }
.big h2 { font-size: 28px; margin: 0 0 16px; }
.big ul { margin: 0; padding-left: 20px; font-size: 16px; color: var(--ink-2); display: flex; flex-direction: column; gap: 8px; }
.release-head { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-bottom: 16px; }
.release-head h2 { margin: 0; }
.muted { font-size: 14px; color: var(--muted); }
.more { display: inline-block; margin-top: 16px; font-size: 15px; padding: 10px 0; }

.footer { border-top: 1px solid var(--border); padding: 32px 0 48px; }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; font-size: 14px; color: var(--muted); }
.brand-sm { display: flex; align-items: center; gap: 10px; }
.brand-sm img { border-radius: 6px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a { padding: 10px 0; }

@media (max-width: 760px) {
  .panes { grid-template-columns: minmax(0, 1fr); }
  .side, .log { border: 0; }
  .side { border-bottom: 1px solid rgba(255, 255, 255, 0.14); }
  .log { border-top: 1px solid rgba(255, 255, 255, 0.14); }
  .hero { padding-bottom: 64px; }
  .hero-body { padding-top: 32px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .btn { transition: none; } }