:root {
  --ink: #0d0d12;
  --primary: #6B6FD6;
  --accent: #AEB7FF;
  --warm: #F7B8C8;
  --text: #1a1a22;
  --muted: #5f5f6e;
  --line: #e9e9f1;
  --bg: #ffffff;
  --bg-soft: #f7f7fb;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid rgba(13, 13, 18, 0.06);
}
.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 24px;
  height: 60px; display: flex; align-items: center; gap: 30px;
}
.brand { display: flex; align-items: center; gap: 9px; color: var(--ink); font-weight: 700; font-size: 16.5px; }
.brand img { width: 26px; height: 26px; display: block; }
.brand .en { font-weight: 500; color: var(--muted); font-size: 14px; }
.nav-links { display: flex; gap: 26px; margin-left: 14px; }
.nav-links a { color: rgba(26, 26, 34, 0.66); font-size: 14px; transition: color 0.15s; }
.nav-links a:hover { color: var(--ink); }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.nav-login { color: rgba(26, 26, 34, 0.7); font-size: 14px; padding: 8px 14px; }
.nav-login:hover { color: var(--ink); }
.nav-cta {
  padding: 9px 22px; border-radius: 999px;
  background: var(--ink); color: #fff;
  font-size: 14px; font-weight: 600;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.nav-cta:hover { background: #2a2a36; transform: translateY(-1px); box-shadow: 0 8px 22px rgba(13, 13, 18, 0.22); }

/* ---------- hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(52% 42% at 18% 22%, rgba(107, 111, 214, 0.34), transparent 70%),
    radial-gradient(46% 40% at 82% 16%, rgba(174, 183, 255, 0.5), transparent 72%),
    radial-gradient(50% 44% at 68% 78%, rgba(247, 184, 200, 0.4), transparent 72%),
    radial-gradient(40% 36% at 30% 86%, rgba(174, 183, 255, 0.32), transparent 70%),
    #fbfbfe;
  padding: 88px 0 0;
  text-align: center;
}
.hero::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 260px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0), var(--bg) 82%);
  pointer-events: none;
  z-index: 0;
}
.hero .wrap { position: relative; z-index: 1; }
.hero-logo {
  width: 84px; height: 84px; margin-bottom: 30px;
  filter: drop-shadow(0 10px 28px rgba(107, 111, 214, 0.3));
}
.hero h1 {
  font-size: 68px; font-weight: 800; line-height: 1.12;
  color: var(--ink); letter-spacing: -0.01em;
}
.hero .sub {
  margin: 22px auto 0; max-width: 560px;
  color: rgba(26, 26, 34, 0.62); font-size: 17px;
}
.hero-actions { margin-top: 36px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 30px; border-radius: 999px; font-size: 15px; font-weight: 600;
  transition: transform 0.16s, box-shadow 0.16s, background 0.16s;
}
.btn svg { width: 15px; height: 15px; }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { background: #2a2a36; transform: translateY(-1px); box-shadow: 0 10px 28px rgba(13, 13, 18, 0.24); }
.btn-light { background: rgba(255, 255, 255, 0.75); color: var(--ink); border: 1px solid rgba(13, 13, 18, 0.1); }
.btn-light:hover { background: #fff; transform: translateY(-1px); box-shadow: 0 8px 22px rgba(13, 13, 18, 0.1); }
.hero-note { margin-top: 30px; font-size: 13px; color: rgba(26, 26, 34, 0.45); }
.hero-note b { color: rgba(26, 26, 34, 0.72); font-weight: 600; }

/* ---------- console mock (light) ---------- */
.mock-wrap { position: relative; padding: 64px 24px 0; }
.mock {
  position: relative; z-index: 2;
  margin: 0 auto -160px;
  max-width: 960px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid rgba(13, 13, 18, 0.08);
  box-shadow:
    0 2px 8px rgba(13, 13, 18, 0.04),
    0 32px 80px rgba(63, 63, 120, 0.2);
  overflow: hidden;
  text-align: left;
}
.mock-bar {
  height: 42px; display: flex; align-items: center; gap: 8px;
  padding: 0 16px;
  border-bottom: 1px solid rgba(13, 13, 18, 0.06);
  background: #fbfbfc;
}
.mock-bar i { width: 10px; height: 10px; border-radius: 50%; }
.mock-bar i:nth-child(1) { background: #ff5f57; }
.mock-bar i:nth-child(2) { background: #febc2e; }
.mock-bar i:nth-child(3) { background: #28c840; }
.mock-bar .url {
  margin-left: 12px; padding: 4px 14px; border-radius: 7px;
  background: rgba(13, 13, 18, 0.05);
  color: rgba(26, 26, 34, 0.4); font-size: 11.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.mock-body { display: flex; height: 420px; }
.mock-side {
  width: 176px; flex: none; padding: 16px 10px;
  border-right: 1px solid rgba(13, 13, 18, 0.06);
  display: flex; flex-direction: column; gap: 3px;
  background: #fbfbfc;
}
.mock-side .logo-row { display: flex; align-items: center; gap: 8px; padding: 4px 8px 14px; }
.mock-side .logo-row img { width: 20px; height: 20px; }
.mock-side .logo-row b { color: var(--ink); font-size: 13px; }
.mock-item {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 10px; border-radius: 8px;
  color: rgba(26, 26, 34, 0.5); font-size: 12.5px;
}
.mock-item i { width: 14px; height: 14px; border-radius: 4px; background: rgba(13, 13, 18, 0.08); flex: none; }
.mock-item.on { background: rgba(107, 111, 214, 0.12); color: var(--ink); font-weight: 600; }
.mock-item.on i { background: linear-gradient(135deg, var(--primary), var(--accent)); }
.mock-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.mock-head {
  display: flex; align-items: center; gap: 10px;
  padding: 13px 20px; border-bottom: 1px solid rgba(13, 13, 18, 0.06);
}
.mock-head b { color: var(--ink); font-size: 13.5px; }
.mock-model {
  margin-left: auto; padding: 4px 12px; border-radius: 999px;
  background: rgba(107, 111, 214, 0.1); border: 1px solid rgba(107, 111, 214, 0.22);
  color: var(--primary); font-size: 11.5px; font-weight: 600;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.mock-chat { flex: 1; padding: 18px 20px; display: flex; flex-direction: column; gap: 12px; }
.bubble { max-width: 76%; padding: 10px 14px; border-radius: 14px; font-size: 12.5px; line-height: 1.65; }
.bubble.user {
  align-self: flex-end;
  background: var(--primary);
  color: #fff; border-bottom-right-radius: 4px;
}
.bubble.ai {
  align-self: flex-start;
  background: #f4f4f8;
  border: 1px solid rgba(13, 13, 18, 0.05);
  color: rgba(26, 26, 34, 0.78); border-bottom-left-radius: 4px;
}
.bubble.ai code {
  display: block; margin-top: 8px; padding: 9px 11px; border-radius: 8px;
  background: var(--ink); color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px; line-height: 1.7;
}
.mock-input {
  margin: 0 20px 16px; display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; border-radius: 12px;
  background: #fff;
  border: 1px solid rgba(13, 13, 18, 0.1);
  color: rgba(26, 26, 34, 0.38); font-size: 12.5px;
}
.mock-input .send {
  margin-left: auto; width: 26px; height: 26px; border-radius: 8px; flex: none;
  background: var(--ink);
  display: flex; align-items: center; justify-content: center;
}
.mock-input .send svg { width: 13px; height: 13px; }

/* ---------- sections ---------- */
.section { padding: 110px 0; }
.section.soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto; }
.eyebrow {
  display: inline-block; padding: 5px 14px; border-radius: 999px;
  background: rgba(107, 111, 214, 0.1); color: var(--primary);
  font-size: 13px; font-weight: 600; letter-spacing: 0.05em;
  margin-bottom: 18px;
}
.section-title { font-size: 38px; font-weight: 800; letter-spacing: -0.01em; line-height: 1.25; color: var(--ink); }
.section-sub { color: var(--muted); margin-top: 14px; font-size: 16px; }

.features { margin-top: 56px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: 20px;
  padding: 28px 24px;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 18px 44px rgba(63, 63, 120, 0.1); border-color: rgba(107, 111, 214, 0.4); }
.card .ico {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
  background: var(--ink); color: #fff;
}
.card .ico svg { width: 19px; height: 19px; }
.card h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 8px; color: var(--ink); }
.card p { font-size: 13.5px; color: var(--muted); line-height: 1.7; }

/* ---------- how ---------- */
.how-grid { margin-top: 56px; display: grid; grid-template-columns: 1fr 1.1fr; gap: 52px; align-items: center; }
.steps { display: flex; flex-direction: column; gap: 12px; }
.step {
  display: flex; gap: 18px; padding: 22px 24px;
  border-radius: 18px; background: var(--bg); border: 1px solid var(--line);
  transition: border-color 0.18s, box-shadow 0.18s;
}
.step:hover { border-color: rgba(107, 111, 214, 0.4); box-shadow: 0 12px 30px rgba(63, 63, 120, 0.08); }
.step .num {
  width: 34px; height: 34px; border-radius: 50%; flex: none;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 14px; color: #fff;
  background: var(--ink);
}
.step h3 { font-size: 15.5px; font-weight: 700; margin-bottom: 4px; color: var(--ink); }
.step p { font-size: 13.5px; color: var(--muted); }

.code-block {
  background: var(--ink); border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 22px 56px rgba(13, 13, 18, 0.22);
}
.code-head {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.code-head i { width: 10px; height: 10px; border-radius: 50%; }
.code-head i:nth-child(1) { background: #ff5f57; }
.code-head i:nth-child(2) { background: #febc2e; }
.code-head i:nth-child(3) { background: #28c840; }
.code-head span { margin-left: 10px; color: rgba(255, 255, 255, 0.35); font-size: 12px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.code-block pre {
  padding: 22px 26px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px; line-height: 1.9; color: rgba(255, 255, 255, 0.85);
  overflow-x: auto;
}
.c-cmt { color: rgba(174, 183, 255, 0.5); }
.c-k { color: var(--warm); }
.c-v { color: var(--accent); }
.c-fn { color: #9ee8c0; }

.toolchain { margin-top: 46px; text-align: center; }
.toolchain p { color: var(--muted); font-size: 13.5px; margin-bottom: 16px; letter-spacing: 0.02em; }
.toolchain .chips { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.toolchain .chips span {
  padding: 8px 20px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--bg);
  color: var(--text); font-size: 13.5px; font-weight: 500;
  transition: border-color 0.15s, transform 0.15s;
}
.toolchain .chips span:hover { border-color: rgba(107, 111, 214, 0.5); transform: translateY(-1px); }

/* ---------- cta ---------- */
.cta {
  padding: 100px 0; text-align: center;
  background:
    radial-gradient(40% 60% at 20% 20%, rgba(107, 111, 214, 0.14), transparent 70%),
    radial-gradient(40% 60% at 80% 80%, rgba(247, 184, 200, 0.16), transparent 70%),
    var(--bg);
}
.cta h2 { font-size: 38px; font-weight: 800; color: var(--ink); letter-spacing: -0.01em; }
.cta p { margin-top: 12px; color: var(--muted); font-size: 16px; }
.cta .hero-actions { margin-top: 32px; }

footer { padding: 36px 0; border-top: 1px solid var(--line); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; color: rgba(26, 26, 34, 0.45); font-size: 13px; flex-wrap: wrap; gap: 12px; }
.footer-inner .fbrand { display: flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 600; }
.footer-inner img { width: 19px; height: 19px; }
.footer-inner .flinks { display: flex; gap: 22px; }
.footer-inner .flinks a:hover { color: var(--ink); }

@media (max-width: 900px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .how-grid { grid-template-columns: 1fr; gap: 34px; }
  .hero h1 { font-size: 48px; }
  .mock-body { height: 380px; }
  .mock-side { width: 54px; padding: 16px 8px; }
  .mock-item span, .mock-side .logo-row b { display: none; }
  .mock-side .logo-row { justify-content: center; }
  .mock-item { justify-content: center; }
}
@media (max-width: 560px) {
  .features { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hero { padding: 64px 0 0; }
  .hero h1 { font-size: 38px; }
  .hero-logo { width: 64px; height: 64px; margin-bottom: 22px; }
  .section { padding: 72px 0; }
  .section-title { font-size: 27px; }
  .cta h2 { font-size: 27px; }
  .mock { margin-bottom: -110px; border-radius: 12px; }
  .mock-body { height: 320px; }
}

.doc { padding: 56px 0 96px; min-height: 60vh; }
.doc-wrap { max-width: 800px; }
.doc h1 { font-size: 40px; font-weight: 800; letter-spacing: -0.01em; color: var(--ink); }
.doc-lead { color: var(--muted); margin-top: 12px; font-size: 17px; }
.doc h2 { font-size: 22px; font-weight: 700; color: var(--ink); margin: 40px 0 12px; scroll-margin-top: 80px; }
.doc p, .doc li { color: var(--text); font-size: 15.5px; line-height: 1.85; }
.doc p { margin-top: 10px; }
.doc ul { margin: 10px 0 0 22px; }
.doc a:not(.btn) { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.doc code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: var(--bg-soft); border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; font-size: 13.5px; }
.doc .code-block { margin-top: 14px; }
.doc .btn { margin-top: 14px; }
@media (max-width: 720px) { .doc h1 { font-size: 30px; } }

/* ---- download / pricing pages ---- */
.steps-wide { max-width: 760px; margin: 0 auto; }
.dl-box { margin: 8px 0 32px; padding: 28px; border: 1px solid rgba(26, 26, 34, 0.08); border-radius: 20px; background: #fff; }
.dl-meta { display: grid; grid-template-columns: max-content 1fr; gap: 10px 24px; margin: 20px 0 0; }
.dl-meta dt { color: rgba(26, 26, 34, 0.55); }
.dl-meta dd { margin: 0; overflow-wrap: anywhere; }
.table-wrap { overflow-x: auto; margin: 16px 0; }
.doc table { width: 100%; border-collapse: collapse; font-size: 15px; }
.doc caption { text-align: left; padding-bottom: 8px; color: rgba(26, 26, 34, 0.55); font-size: 13px; }
.doc th, .doc td { padding: 12px 14px; text-align: left; border-bottom: 1px solid rgba(26, 26, 34, 0.08); white-space: nowrap; }
.doc thead th { font-weight: 600; background: rgba(26, 26, 34, 0.03); }