:root {
  --brand: #1268e8;
  --brand-dark: #0d4fb5;
  --ink: #14233b;
  --muted: #65758b;
  --line: #e5edf5;
  --wash: #f5f8fc;
  --cyan: #14b8c4;
  --green: #24a46d;
  --orange: #f59e0b;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; font-family: "Microsoft YaHei UI", "Segoe UI", sans-serif; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }

.promo { height: 48px; display: flex; align-items: center; background: #e8f0ff; color: #2453a6; font-size: 14px; }
.promo-inner { display: flex; align-items: center; justify-content: center; gap: 22px; }
.promo strong { color: #123f98; font-weight: 700; }
.promo a { display: inline-flex; align-items: center; gap: 6px; color: var(--brand); font-weight: 600; }

.site-header { position: sticky; top: 0; z-index: 40; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line); }
.nav { height: 76px; display: flex; align-items: center; gap: 42px; }
.brand { display: inline-flex; align-items: center; gap: 10px; min-width: 180px; font-size: 22px; font-weight: 800; letter-spacing: 0; color: var(--brand-dark); }
.brand-mark { width: 34px; height: 34px; position: relative; display: inline-block; border: 3px solid var(--brand); border-radius: 50%; }
.brand-mark:before, .brand-mark:after { content: ""; position: absolute; background: var(--brand); border-radius: 50%; }
.brand-mark:before { width: 8px; height: 8px; left: 7px; top: 10px; box-shadow: 10px 0 0 var(--brand); }
.brand-mark:after { width: 14px; height: 5px; left: 7px; top: 20px; border-radius: 0 0 10px 10px; }
.nav-links { display: flex; align-items: center; gap: 28px; flex: 1; }
.nav-links a { color: #3c4b61; font-size: 14px; padding: 28px 0 25px; border-bottom: 3px solid transparent; white-space: nowrap; }
.nav-links a:hover, .nav-links a.active { color: var(--brand); border-bottom-color: var(--brand); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.phone { color: var(--muted); font-size: 13px; white-space: nowrap; }
.phone b { display: block; color: var(--ink); font-size: 16px; }
.btn { border: 1px solid transparent; border-radius: 4px; padding: 11px 20px; font-size: 14px; line-height: 1; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 8px; transition: .2s ease; }
.btn-primary { color: #fff; background: var(--brand); box-shadow: 0 8px 20px rgba(18,104,232,.2); }
.btn-primary:hover { background: var(--brand-dark); transform: translateY(-1px); }
.btn-ghost { color: var(--brand); border-color: #9dbef5; background: #fff; }
.btn-ghost:hover { background: #edf4ff; }
.nav-toggle { display: none; border: 0; background: transparent; color: var(--brand); font-size: 24px; }

.hero { min-height: 570px; display: flex; align-items: center; position: relative; overflow: hidden; background: #dff2fb url('/upload/voice/yutou-b5.jpg') center/cover no-repeat; }
.hero:after { content: ""; position: absolute; inset: 0; background: rgba(224,244,253,.28); pointer-events: none; }
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 36px; padding: 72px 0; }
.hero-copy { max-width: 570px; }
.hero-kicker { color: var(--brand); font-weight: 700; font-size: 15px; margin-bottom: 18px; }
.hero h1 { margin: 0 0 22px; font-size: clamp(38px, 4.6vw, 62px); line-height: 1.15; letter-spacing: 0; font-weight: 800; }
.hero h1 span { color: var(--brand); }
.hero p { margin: 0; max-width: 520px; color: #4b6179; font-size: 17px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.hero-proof { display: flex; gap: 24px; margin-top: 34px; color: #49647f; font-size: 13px; }
.hero-proof strong { display: block; color: var(--ink); font-size: 18px; }
.chat-preview { width: min(430px, 100%); margin-left: auto; background: #fff; border-radius: 8px; box-shadow: 0 26px 60px rgba(18,71,132,.2); overflow: hidden; transform: translateY(8px); }
.chat-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; color: #fff; background: var(--brand); }
.chat-head strong { font-size: 15px; }
.chat-status { font-size: 12px; opacity: .85; }
.chat-body { padding: 18px; background: #f6f8fb; }
.chat-msg { display: flex; gap: 10px; margin-bottom: 16px; }
.chat-msg.right { justify-content: flex-end; }
.avatar { width: 32px; height: 32px; flex: 0 0 auto; border-radius: 50%; background: #c8ddff; display: grid; place-items: center; color: var(--brand-dark); font-size: 12px; font-weight: 700; }
.chat-msg.right .avatar { order: 2; background: #c8f0df; color: #16714a; }
.bubble { max-width: 260px; padding: 10px 13px; border-radius: 6px; background: #fff; color: #43556b; font-size: 13px; box-shadow: 0 2px 8px rgba(42,63,90,.06); }
.chat-msg.right .bubble { background: #dcecff; color: #1a4a8a; }
.chat-foot { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-top: 1px solid var(--line); color: #8999ac; font-size: 12px; }
.chat-input { flex: 1; padding: 8px 10px; background: #f7f9fc; border: 1px solid var(--line); border-radius: 4px; }

.section { padding: 92px 0; }
.section.alt { background: var(--wash); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.section-head .eyebrow { color: var(--brand); font-size: 13px; font-weight: 700; letter-spacing: .08em; }
.section-head h2 { margin: 10px 0 12px; font-size: 34px; line-height: 1.25; }
.section-head p { margin: 0; color: var(--muted); font-size: 15px; }

.channel-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; }
.channel { min-height: 118px; padding: 20px 14px; border: 1px solid var(--line); border-radius: 6px; background: #fff; text-align: center; transition: .2s ease; }
.channel:hover { border-color: #a9c8f8; box-shadow: 0 12px 24px rgba(34,89,150,.08); transform: translateY(-3px); }
.channel-icon { width: 40px; height: 40px; margin: 0 auto 10px; border-radius: 12px; display: grid; place-items: center; font-size: 13px; font-weight: 700; color: #fff; background: var(--brand); }
.channel:nth-child(2) .channel-icon { background: var(--cyan); } .channel:nth-child(3) .channel-icon { background: var(--green); } .channel:nth-child(4) .channel-icon { background: var(--orange); } .channel:nth-child(5) .channel-icon { background: #7b61d8; } .channel:nth-child(6) .channel-icon { background: #e35b7a; }
.channel b { display: block; font-size: 14px; }
.channel small { color: var(--muted); font-size: 12px; }

.feature-layout { display: grid; grid-template-columns: 280px 1fr; gap: 44px; align-items: start; }
.feature-tabs { display: grid; gap: 8px; }
.feature-tab { text-align: left; border: 1px solid transparent; border-radius: 5px; padding: 16px 18px; background: transparent; color: #4f627b; cursor: pointer; }
.feature-tab:hover { background: #edf4ff; color: var(--brand); }
.feature-tab.active { color: var(--brand); background: #eaf2ff; border-color: #c4d9fb; font-weight: 700; }
.feature-panel { min-height: 280px; display: none; grid-template-columns: 1fr 1fr; gap: 24px; align-items: center; padding: 30px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.feature-panel.active { display: grid; }
.feature-panel h3 { margin: 0 0 12px; font-size: 24px; }
.feature-panel p { margin: 0 0 18px; color: var(--muted); font-size: 14px; }
.feature-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; color: #40556e; font-size: 13px; }
.feature-list li:before { content: "✓"; display: inline-grid; place-items: center; width: 18px; height: 18px; margin-right: 8px; border-radius: 50%; color: #fff; background: var(--brand); font-size: 11px; }
.feature-visual { min-height: 200px; display: grid; place-items: center; background: #edf5ff; border-radius: 6px; color: var(--brand); }
.feature-visual img { max-width: 84%; max-height: 220px; object-fit: contain; }

.capability-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.capability { padding: 24px; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
.capability h3 { margin: 16px 0 8px; font-size: 17px; }
.capability p { margin: 0; color: var(--muted); font-size: 13px; }
.capability-mark { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 10px; background: #eaf2ff; color: var(--brand); font-weight: 800; }

.trust { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.trust-image { min-height: 330px; display: grid; place-items: center; background: #f1f8fb; border-radius: 8px; overflow: hidden; }
.trust-image img { width: 100%; height: 100%; object-fit: cover; }
.trust h2 { margin: 0 0 16px; font-size: 32px; }
.trust p { color: var(--muted); font-size: 15px; }
.trust-points { display: grid; gap: 14px; margin-top: 26px; }
.trust-point { display: flex; gap: 12px; align-items: flex-start; }
.trust-point i { width: 28px; height: 28px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--brand); font-style: normal; font-size: 12px; }
.trust-point b { display: block; margin-bottom: 2px; font-size: 14px; }
.trust-point span { color: var(--muted); font-size: 13px; }

.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: stretch; }
.price-card { position: relative; display: flex; flex-direction: column; padding: 30px 26px 26px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.price-card.recommended { border: 2px solid var(--brand); box-shadow: 0 16px 34px rgba(18,104,232,.15); }
.price-badge { position: absolute; top: -13px; right: 18px; padding: 5px 10px; border-radius: 20px; color: #fff; background: var(--brand); font-size: 11px; }
.price-card h3 { margin: 0 0 8px; font-size: 20px; }
.price-desc { min-height: 42px; margin: 0 0 18px; color: var(--muted); font-size: 13px; }
.price { margin-bottom: 22px; color: var(--brand); font-size: 36px; font-weight: 800; }
.price small { color: var(--muted); font-size: 13px; font-weight: 400; }
.price-features { list-style: none; flex: 1; display: grid; gap: 11px; margin: 0 0 24px; padding: 0; color: #4a6079; font-size: 13px; }
.price-features li:before { content: "✓"; margin-right: 8px; color: var(--green); font-weight: 800; }

.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 28px; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q { width: 100%; padding: 17px 4px; border: 0; background: transparent; color: var(--ink); cursor: pointer; text-align: left; display: flex; justify-content: space-between; gap: 12px; font-weight: 600; }
.faq-q span:last-child { color: var(--brand); font-size: 20px; line-height: 1; }
.faq-a { max-height: 0; overflow: hidden; padding: 0 4px; color: var(--muted); font-size: 13px; transition: max-height .25s ease, padding .25s ease; }
.faq-item.open .faq-a { max-height: 140px; padding-bottom: 16px; }

.footer { padding: 54px 0 30px; color: #c7d7ef; background: #102846; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1.2fr; gap: 38px; }
.footer .brand { color: #fff; }
.footer .brand-mark { border-color: #58a4ff; } .footer .brand-mark:before, .footer .brand-mark:after { background: #58a4ff; box-shadow: 10px 0 0 #58a4ff; }
.footer h4 { margin: 0 0 15px; color: #fff; font-size: 14px; }
.footer p, .footer li, .footer a { color: #afc4de; font-size: 13px; }
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.footer a:hover { color: #fff; }
.copyright { margin-top: 36px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.14); color: #8fa8c6; font-size: 12px; }

.float-tools { position: fixed; z-index: 45; right: 18px; bottom: 24px; display: grid; gap: 8px; }
.float-tool { width: 46px; height: 46px; display: grid; place-items: center; border: 1px solid #d8e5f5; border-radius: 50%; color: var(--brand); background: #fff; box-shadow: 0 8px 22px rgba(20,65,110,.14); font-size: 12px; font-weight: 700; }
.float-tool:hover { color: #fff; background: var(--brand); }

@media (max-width: 980px) {
  .nav { gap: 16px; } .nav-links { gap: 16px; } .phone { display: none; }
  .hero-inner { grid-template-columns: 1fr .85fr; } .channel-grid { grid-template-columns: repeat(3, 1fr); }
  .capability-grid { grid-template-columns: repeat(2, 1fr); } .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .container { width: min(100% - 32px, 560px); }
  .promo { height: auto; padding: 10px 0; } .promo-inner { justify-content: flex-start; gap: 10px; font-size: 12px; }
  .nav { height: 64px; justify-content: space-between; } .brand { min-width: 0; font-size: 19px; } .nav-toggle { display: block; }
  .nav-links, .nav-actions { display: none; } .nav-links.open { position: absolute; top: 64px; left: 0; right: 0; display: grid; gap: 0; padding: 8px 16px 14px; border-bottom: 1px solid var(--line); background: #fff; box-shadow: 0 12px 20px rgba(20,50,90,.08); }
  .nav-links.open a { padding: 12px 4px; border: 0; }
  .hero { min-height: 0; background-position: 65% center; } .hero-inner { grid-template-columns: 1fr; padding: 64px 0 48px; } .hero h1 { font-size: 40px; } .hero p { font-size: 15px; }
  .chat-preview { margin: 12px auto 0; } .hero-proof { gap: 16px; }
  .section { padding: 64px 0; } .section-head { margin-bottom: 32px; } .section-head h2 { font-size: 28px; }
  .channel-grid { grid-template-columns: repeat(2, 1fr); } .feature-layout, .trust { grid-template-columns: 1fr; gap: 24px; } .feature-panel { grid-template-columns: 1fr; padding: 22px; }
  .capability-grid, .pricing-grid, .faq-grid { grid-template-columns: 1fr; } .footer-grid { grid-template-columns: 1fr 1fr; gap: 26px 18px; }
}