:root {
  --bg: #0b1020;
  --bg-soft: #111834;
  --panel: #151d3a;
  --panel-2: #1b2547;
  --line: #27325c;
  --text: #eef1fb;
  --muted: #a6b0d4;
  --brand: #6c8cff;
  --brand-2: #8ad7c0;
  --accent: #ffc98c;
  --ok: #5fd39a;
  --warn: #ffb4a2;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(4, 8, 24, .45);
  --max: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(900px 500px at 12% -8%, rgba(108, 140, 255, .22), transparent 60%),
    radial-gradient(700px 460px at 88% 4%, rgba(138, 215, 192, .14), transparent 62%);
  pointer-events: none;
  z-index: 0;
}

.wrap { width: min(100% - 40px, var(--max)); margin-inline: auto; position: relative; z-index: 1; }

a { color: var(--brand-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- header ---------- */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 16, 32, .82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; gap: 18px; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; color: var(--text); letter-spacing: .3px; }
.logo .mark {
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(140deg, var(--brand), var(--brand-2));
  display: grid; place-items: center; color: #0b1020; font-weight: 800; font-size: .9rem;
}
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  color: var(--muted); padding: 8px 12px; border-radius: 9px; font-size: .93rem;
}
.nav-links a:hover { color: var(--text); background: var(--panel); text-decoration: none; }
.nav-cta { display: flex; gap: 10px; align-items: center; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); color: var(--text); border-radius: 9px; padding: 7px 11px; cursor: pointer; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; border-radius: 11px; font-weight: 600; font-size: .95rem;
  border: 1px solid transparent; cursor: pointer; transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  font-family: inherit;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--brand), #8b7dff); color: #fff; box-shadow: 0 10px 26px rgba(108, 140, 255, .32); }
.btn-secondary { background: var(--panel); border-color: var(--line); color: var(--text); }
.btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
.btn-sm { padding: 8px 14px; font-size: .87rem; }
.btn[disabled] { opacity: .55; cursor: not-allowed; transform: none; }

/* ---------- hero ---------- */
.hero { padding: 76px 0 56px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 46px; align-items: start; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 13px; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(21, 29, 58, .7); color: var(--brand-2);
  font-size: .8rem; letter-spacing: .4px; margin-bottom: 20px;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--brand-2); }
h1 { font-size: clamp(2.1rem, 4.4vw, 3.35rem); line-height: 1.22; margin: 0 0 18px; letter-spacing: -.5px; }
h1 .accent { background: linear-gradient(120deg, var(--brand-2), var(--brand)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { font-size: 1.08rem; color: var(--muted); max-width: 56ch; margin: 0 0 26px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 30px; }

/* ---------- composer card ---------- */
.composer {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line); border-radius: 18px; padding: 22px; box-shadow: var(--shadow);
}
.composer h3 { margin: 0 0 6px; font-size: 1.05rem; }
.composer .hint { color: var(--muted); font-size: .88rem; margin: 0 0 14px; }
.composer textarea {
  width: 100%; min-height: 108px; resize: vertical; padding: 14px; border-radius: 12px;
  background: #0d142c; color: var(--text);
  border: 1px solid var(--line); font-family: inherit; font-size: .96rem; line-height: 1.6;
}
.composer textarea:focus, .composer input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--brand); outline-offset: 1px; border-color: var(--brand);
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 16px; }
.chip {
  border: 1px solid var(--line); background: rgba(11, 16, 32, .5); color: var(--muted);
  border-radius: 999px; padding: 6px 12px; font-size: .82rem; cursor: pointer; font-family: inherit;
}
.chip:hover { color: var(--text); border-color: var(--brand); }
.composer-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.micro { color: var(--muted); font-size: .78rem; }

/* ---------- sections ---------- */
section { padding: 66px 0; }
.section-head { max-width: 62ch; margin-bottom: 34px; }
.section-head h2 { font-size: clamp(1.6rem, 2.7vw, 2.15rem); margin: 0 0 12px; letter-spacing: -.3px; }
.section-head p { color: var(--muted); margin: 0; }
.kicker { color: var(--brand-2); font-size: .82rem; letter-spacing: 1.6px; text-transform: uppercase; margin-bottom: 10px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; transition: border-color .18s ease, transform .18s ease;
}
.card:hover { border-color: #3a4a80; transform: translateY(-2px); }
.card h3 { margin: 0 0 8px; font-size: 1.02rem; }
.card p { margin: 0; color: var(--muted); font-size: .92rem; }
.card .icon {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  background: rgba(108, 140, 255, .16); color: var(--brand); margin-bottom: 14px; font-size: 1.1rem;
}
.step-num {
  font-size: .76rem; color: var(--brand-2); letter-spacing: 1.4px; font-weight: 700; margin-bottom: 10px; display: block;
}

.band { background: var(--bg-soft); border-block: 1px solid var(--line); }

.tag {
  display: inline-block; font-size: .72rem; padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--muted); margin-right: 6px;
}
.tag.live { color: var(--ok); border-color: rgba(95, 211, 154, .4); }
.tag.demo { color: var(--accent); border-color: rgba(255, 201, 140, .4); }
.tag.pending { color: var(--warn); border-color: rgba(255, 180, 162, .4); }

/* ---------- product visual (真实交互演示) ---------- */
.app-shell {
  background: #0e1530; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow);
}
.app-bar { display: flex; align-items: center; gap: 10px; padding: 11px 14px; border-bottom: 1px solid var(--line); background: #121a38; }
.app-bar .dot { width: 9px; height: 9px; border-radius: 50%; background: #33406f; }
.app-bar span.title { font-size: .82rem; color: var(--muted); margin-left: 6px; }
.app-body { padding: 16px; }
.app-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.app-table th, .app-table td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); }
.app-table th { color: var(--muted); font-weight: 600; font-size: .78rem; letter-spacing: .4px; }
.app-table td { color: var(--text); }
.pill { font-size: .72rem; padding: 2px 9px; border-radius: 999px; background: rgba(108, 140, 255, .16); color: var(--brand); }
.pill.ok { background: rgba(95, 211, 154, .16); color: var(--ok); }
.pill.warn { background: rgba(255, 201, 140, .16); color: var(--accent); }

/* ---------- agent chat ---------- */
.chat-wrap { display: grid; grid-template-columns: 1fr 320px; gap: 20px; align-items: start; }
.chat {
  background: var(--panel); border: 1px solid var(--line); border-radius: 16px;
  display: flex; flex-direction: column; height: 560px; overflow: hidden;
}
.chat-log { flex: 1; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 84%; padding: 11px 14px; border-radius: 13px; font-size: .92rem; white-space: pre-wrap; line-height: 1.65; }
.msg.bot { background: var(--panel-2); border: 1px solid var(--line); align-self: flex-start; border-bottom-left-radius: 4px; }
.msg.me { background: linear-gradient(135deg, var(--brand), #8b7dff); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }
.chat-input { display: flex; gap: 10px; padding: 14px; border-top: 1px solid var(--line); }
.chat-input textarea {
  flex: 1; min-height: 46px; max-height: 130px; resize: none; padding: 11px 13px; border-radius: 11px;
  background: #0d142c; border: 1px solid var(--line); color: var(--text); font-family: inherit; font-size: .93rem;
}
.chat-side { display: flex; flex-direction: column; gap: 14px; }
.turn-meter { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
.turn-dots { display: flex; gap: 7px; margin: 10px 0 8px; }
.turn-dots i { flex: 1; height: 5px; border-radius: 3px; background: #2a3560; }
.turn-dots i.on { background: linear-gradient(90deg, var(--brand), var(--brand-2)); }

/* ---------- blueprint ---------- */
.blueprint { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 22px; }
.bp-item { border-top: 1px solid var(--line); padding: 14px 0; }
.bp-item:first-child { border-top: 0; }
.bp-item h4 { margin: 0 0 6px; font-size: .95rem; color: var(--brand-2); }
.bp-item p, .bp-item ul { margin: 0; color: var(--text); font-size: .92rem; }
.bp-item ul { padding-left: 18px; }
.bp-item li { margin: 3px 0; }

/* ---------- forms ---------- */
form { display: grid; gap: 16px; }
label { display: grid; gap: 7px; font-size: .9rem; color: var(--muted); }
input, select, textarea {
  padding: 11px 13px; border-radius: 11px; background: #0d142c; border: 1px solid var(--line);
  color: var(--text); font-family: inherit; font-size: .95rem; width: 100%;
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-note { font-size: .8rem; color: var(--muted); }
.form-status { padding: 12px 14px; border-radius: 11px; font-size: .9rem; display: none; }
.form-status.ok { display: block; background: rgba(95, 211, 154, .12); border: 1px solid rgba(95, 211, 154, .35); color: var(--ok); }
.form-status.err { display: block; background: rgba(255, 180, 162, .12); border: 1px solid rgba(255, 180, 162, .35); color: var(--warn); }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary { cursor: pointer; padding: 16px 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--brand-2); font-size: 1.2rem; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 0 0 16px; color: var(--muted); }

/* ---------- footer ---------- */
footer.site { border-top: 1px solid var(--line); padding: 44px 0; margin-top: 40px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 26px; }
.foot-grid h5 { margin: 0 0 12px; font-size: .86rem; letter-spacing: .6px; text-transform: uppercase; color: var(--muted); }
.foot-grid ul { list-style: none; margin: 0; padding: 0; }
.foot-grid li { margin: 7px 0; }
.foot-grid a { color: var(--text); font-size: .9rem; }
.legal { margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; }

/* ---------- notices ---------- */
.notice {
  border: 1px dashed var(--line); border-radius: 12px; padding: 14px 16px; background: rgba(11, 16, 32, .5);
  color: var(--muted); font-size: .88rem;
}
.notice strong { color: var(--text); }

/* ---------- responsive ---------- */
@media (max-width: 940px) {
  .hero-grid, .grid-3, .grid-2, .chat-wrap, .foot-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; background: #0e142b; border-bottom: 1px solid var(--line); padding: 10px 20px 16px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-cta .btn-secondary { display: none; }
  .form-grid { grid-template-columns: 1fr; }
  .chat { height: 480px; }
}
@media (max-width: 560px) {
  .wrap { width: min(100% - 28px, var(--max)); }
  h1 { font-size: 1.95rem; }
  section { padding: 48px 0; }
  .cta-row .btn { width: 100%; }
}