:root {
  --ink: #18202d;
  --muted: #647083;
  --muted-2: #8b95a6;
  --line: #e6eaf0;
  --paper: #ffffff;
  --wash: #f6f8fb;
  --blue: #356df3;
  --blue-dark: #2757cf;
  --blue-soft: #eaf0ff;
  --cyan: #39b9d5;
  --green: #20a872;
  --orange: #e9843d;
  --shadow: 0 24px 70px rgba(33, 52, 88, .11);
  --radius: 24px;
  --shell: min(1180px, calc(100vw - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 92px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
img { display: block; max-width: 100%; }

.skip-link {
  position: fixed;
  left: 20px;
  top: -80px;
  z-index: 1000;
  padding: 10px 16px;
  color: #fff;
  background: var(--blue);
  border-radius: 10px;
  transition: top .2s ease;
}
.skip-link:focus { top: 14px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  background: rgba(255, 255, 255, .86);
  border-bottom: 1px solid rgba(222, 227, 235, .72);
  backdrop-filter: blur(18px);
}
.nav-shell,
.section-shell,
.footer-shell,
.footer-bottom {
  width: var(--shell);
  margin: 0 auto;
}
.nav-shell {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 18px;
  font-weight: 760;
  letter-spacing: -.02em;
}
.brand-mark {
  display: grid;
  width: 31px;
  height: 31px;
  place-items: center;
  color: #fff;
  background: linear-gradient(145deg, #4784ff, #315adf);
  border-radius: 9px;
  box-shadow: 0 7px 16px rgba(53, 109, 243, .23);
  font-size: 17px;
  font-weight: 800;
}
.desktop-nav { display: flex; gap: 34px; margin-left: 78px; }
.desktop-nav a,
.nav-login {
  color: #576274;
  font-size: 14px;
  transition: color .2s ease;
}
.desktop-nav a:hover,
.nav-login:hover { color: var(--blue); }
.nav-actions { display: flex; align-items: center; gap: 24px; }

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 650;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button-small { min-height: 40px; padding: 0 18px; color: #fff; background: var(--ink); }
.button-primary { color: #fff; background: var(--blue); box-shadow: 0 14px 28px rgba(53, 109, 243, .22); }
.button-primary:hover { background: var(--blue-dark); box-shadow: 0 17px 34px rgba(53, 109, 243, .27); }
.button-secondary { background: #fff; border-color: var(--line); }
.button-secondary:hover { border-color: #cbd3df; box-shadow: 0 10px 24px rgba(33, 52, 88, .07); }

.hero {
  min-height: 694px;
  display: grid;
  grid-template-columns: .98fr 1.02fr;
  align-items: center;
  gap: 44px;
  padding-top: 66px;
  padding-bottom: 74px;
}
.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
}
.eyebrow span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--blue);
  border-radius: 99px;
}
.hero h1 {
  margin: 22px 0 24px;
  font-size: clamp(46px, 4.5vw, 66px);
  line-height: 1.13;
  letter-spacing: -.065em;
  font-weight: 760;
}
.hero h1 em { color: var(--blue); font-style: normal; }
.hero-lead {
  max-width: 526px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 34px; }
.hero-assurance { display: flex; flex-wrap: wrap; gap: 17px; margin-top: 27px; }
.hero-assurance span { display: flex; align-items: center; gap: 6px; color: #6d788a; font-size: 12px; }
.hero-assurance i { display: grid; width: 17px; height: 17px; place-items: center; color: var(--green); background: #e8f8f1; border-radius: 50%; font-size: 10px; font-style: normal; font-weight: 900; }

.hero-visual { position: relative; min-height: 548px; }
.soft-glow {
  position: absolute;
  width: 480px;
  height: 480px;
  right: 8px;
  top: 36px;
  background: radial-gradient(circle at 50% 50%, rgba(85, 137, 255, .17), rgba(76, 177, 215, .07) 44%, transparent 72%);
  filter: blur(2px);
}
.live-frame {
  position: absolute;
  width: 350px;
  height: 525px;
  top: 0;
  right: 54px;
  overflow: hidden;
  background: #e9eef5;
  border: 8px solid #fff;
  border-radius: 30px;
  box-shadow: 0 34px 90px rgba(30, 48, 84, .2), 0 0 0 1px rgba(32, 48, 76, .05);
}
.host-image { width: 100%; height: 100%; object-fit: cover; object-position: center 25%; }
.live-topbar {
  position: absolute;
  z-index: 2;
  top: 15px;
  left: 15px;
  right: 15px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #fff;
  font-size: 11px;
  text-shadow: 0 1px 8px rgba(0, 0, 0, .35);
}
.live-badge { display: flex; align-items: center; gap: 6px; padding: 7px 10px; background: rgba(22, 26, 33, .76); border-radius: 99px; backdrop-filter: blur(8px); }
.live-badge i { width: 6px; height: 6px; background: #ff5b6c; border-radius: 50%; box-shadow: 0 0 0 4px rgba(255, 91, 108, .18); }
.caption {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 23px;
  padding: 12px 15px;
  color: #fff;
  background: rgba(24, 30, 39, .7);
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  font-size: 13px;
  line-height: 1.5;
  text-align: center;
}
.product-chip {
  position: absolute;
  z-index: 3;
  top: 78px;
  left: 4px;
  display: flex;
  width: 184px;
  align-items: center;
  gap: 10px;
  padding: 10px;
  background: rgba(255, 255, 255, .94);
  border: 1px solid rgba(218, 224, 234, .84);
  border-radius: 17px;
  box-shadow: 0 17px 44px rgba(36, 54, 88, .14);
  backdrop-filter: blur(12px);
}
.product-chip img { width: 54px; height: 54px; object-fit: cover; border-radius: 11px; }
.product-chip span { min-width: 0; }
.product-chip small { display: block; margin-bottom: 4px; color: var(--green); font-size: 10px; }
.product-chip strong { display: block; overflow: hidden; font-size: 13px; text-overflow: ellipsis; white-space: nowrap; }
.reply-card {
  position: absolute;
  z-index: 3;
  width: 300px;
  left: 12px;
  bottom: 17px;
  padding: 17px 18px 15px;
  background: rgba(255, 255, 255, .96);
  border: 1px solid rgba(218, 224, 234, .86);
  border-radius: 18px;
  box-shadow: 0 20px 50px rgba(28, 49, 90, .17);
  backdrop-filter: blur(14px);
}
.reply-meta { display: grid; grid-template-columns: 28px 1fr auto; align-items: center; gap: 9px; }
.avatar-dot { display: grid; width: 28px; height: 28px; place-items: center; color: #fff; background: #94a3b8; border-radius: 50%; font-size: 11px; }
.reply-meta strong { font-size: 13px; font-weight: 650; }
.reply-meta small { color: var(--muted-2); font-size: 10px; }
.reply-card p { margin: 12px 0 8px 37px; color: #596578; font-size: 12px; line-height: 1.55; }
.reply-card p span { color: var(--blue); font-weight: 700; }
.reply-source { margin-left: 37px; color: var(--green); font-size: 10px; }
.reply-source i { margin-right: 4px; font-style: normal; }

.proof-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fbfcfe; }
.proof-inner {
  width: var(--shell);
  min-height: 78px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  color: #697588;
  font-size: 13px;
}
.proof-inner > span { color: var(--muted-2); }
.proof-inner > div { display: flex; align-items: center; gap: 20px; }
.proof-inner b { color: #4c596c; font-weight: 600; }
.proof-inner i { color: #b9c1cd; font-style: normal; }

.section { padding-top: 112px; padding-bottom: 112px; }
.section-heading h2,
.reliability-copy h2,
.faq-intro h2 {
  margin: 16px 0 16px;
  font-size: clamp(34px, 3vw, 46px);
  line-height: 1.25;
  letter-spacing: -.045em;
}
.section-heading p,
.reliability-copy > p,
.faq-intro > p { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.8; }
.centered { max-width: 700px; margin: 0 auto; text-align: center; }
.centered .eyebrow { justify-content: center; }
.workflow-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 52px; }
.workflow-card {
  position: relative;
  min-height: 284px;
  padding: 28px;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 20px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.workflow-card:hover { transform: translateY(-5px); border-color: #d6deeb; box-shadow: 0 20px 50px rgba(38, 56, 90, .08); }
.step-number { position: absolute; top: 22px; right: 23px; color: #c8d0db; font-size: 12px; font-weight: 700; letter-spacing: .08em; }
.workflow-card h3 { margin: 25px 0 11px; font-size: 19px; letter-spacing: -.02em; }
.workflow-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.step-icon { position: relative; width: 60px; height: 60px; background: var(--blue-soft); border-radius: 17px; }
.product-icon::before { content: ""; position: absolute; width: 28px; height: 32px; left: 16px; top: 15px; border: 2px solid var(--blue); border-radius: 6px; }
.product-icon::after { content: ""; position: absolute; width: 13px; height: 6px; left: 23px; top: 11px; background: var(--blue-soft); border: 2px solid var(--blue); border-radius: 5px 5px 0 0; }
.product-icon i { position: absolute; left: 23px; width: 15px; height: 2px; background: var(--blue); border-radius: 9px; }
.product-icon i:nth-child(1) { top: 25px; }.product-icon i:nth-child(2) { top: 32px; }.product-icon i:nth-child(3) { top: 39px; width: 9px; }
.script-icon::before { content: ""; position: absolute; width: 29px; height: 34px; left: 15px; top: 13px; background: #fff; border: 2px solid var(--blue); border-radius: 5px; transform: rotate(-4deg); }
.script-icon i { position: absolute; z-index: 1; left: 22px; width: 16px; height: 2px; background: var(--blue); border-radius: 9px; transform: rotate(-4deg); }
.script-icon i:nth-child(1) { top: 24px; }.script-icon i:nth-child(2) { top: 31px; }.script-icon i:nth-child(3) { top: 38px; width: 11px; }
.live-icon::before { content: ""; position: absolute; width: 30px; height: 25px; left: 11px; top: 17px; border: 2px solid var(--blue); border-radius: 7px; }
.live-icon::after { content: ""; position: absolute; right: 10px; top: 23px; border: 7px solid transparent; border-right: 0; border-left: 9px solid var(--blue); }
.live-icon i:nth-child(1) { position: absolute; width: 8px; height: 8px; left: 22px; top: 25px; background: var(--blue); border-radius: 50%; }
.comment-icon::before { content: ""; position: absolute; width: 33px; height: 25px; left: 13px; top: 15px; background: #fff; border: 2px solid var(--blue); border-radius: 9px; }
.comment-icon::after { content: ""; position: absolute; width: 8px; height: 8px; left: 20px; top: 37px; background: #fff; border-left: 2px solid var(--blue); transform: skew(-28deg); }
.comment-icon i { position: absolute; z-index: 1; top: 27px; width: 4px; height: 4px; background: var(--blue); border-radius: 50%; }
.comment-icon i:nth-child(1) { left: 23px; }.comment-icon i:nth-child(2) { left: 30px; }.comment-icon i:nth-child(3) { left: 37px; }

.feature-section { background: var(--wash); }
.split-heading { display: grid; grid-template-columns: 1fr 420px; align-items: end; gap: 70px; }
.split-heading p { padding-bottom: 7px; }
.feature-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 55px; }
.feature-card { min-height: 420px; display: flex; flex-direction: column; overflow: hidden; background: #fff; border: 1px solid #e4e9f0; border-radius: 24px; box-shadow: 0 12px 40px rgba(30, 48, 80, .045); }
.feature-card-wide { grid-column: 1 / -1; min-height: 364px; display: grid; grid-template-columns: .78fr 1.22fr; align-items: center; }
.feature-copy { padding: 42px 44px 26px; }
.feature-card-wide .feature-copy { padding: 48px 30px 48px 50px; }
.feature-kicker { color: var(--blue); font-size: 12px; font-weight: 700; letter-spacing: .07em; }
.feature-copy h3 { margin: 13px 0 13px; font-size: 25px; line-height: 1.4; letter-spacing: -.035em; }
.feature-copy p { max-width: 520px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.knowledge-visual { display: grid; grid-template-columns: 1fr 42px 1.15fr; align-items: center; margin: 38px 48px 38px 10px; padding: 28px; background: #f7f9fd; border: 1px solid #e8edf4; border-radius: 19px; }
.knowledge-source,
.knowledge-answer { min-height: 194px; padding: 21px; background: #fff; border: 1px solid #e3e8f0; border-radius: 15px; box-shadow: 0 9px 25px rgba(32, 48, 78, .05); }
.knowledge-source span,
.knowledge-answer span { display: block; margin-bottom: 15px; color: #8792a4; font-size: 11px; }
.knowledge-source b { display: block; margin-top: 9px; padding: 9px 11px; color: #536074; background: #f5f7fa; border-radius: 8px; font-size: 11px; font-weight: 550; }
.knowledge-arrow { color: var(--blue); text-align: center; }
.knowledge-answer p { margin: 0 0 20px; color: #405069; font-size: 13px; line-height: 1.75; }
.knowledge-answer small { color: var(--green); font-size: 10px; }
.avatar-visual { position: relative; flex: 1; min-height: 230px; margin: 0 24px 24px; overflow: hidden; background: linear-gradient(145deg, #e9eff8, #dbe5ef); border-radius: 17px; }
.avatar-visual::after { content: ""; position: absolute; inset: auto 0 0; height: 42%; background: linear-gradient(transparent, rgba(25, 34, 48, .28)); }
.avatar-visual img { width: 100%; height: 100%; object-fit: cover; object-position: center 20%; }
.avatar-visual span { position: absolute; z-index: 2; left: 20px; bottom: 18px; display: flex; height: 24px; align-items: center; gap: 4px; }
.avatar-visual span i { display: block; width: 4px; background: #fff; border-radius: 9px; animation: wave 1.15s ease-in-out infinite alternate; }
.avatar-visual span i:nth-child(1) { height: 8px; }.avatar-visual span i:nth-child(2) { height: 18px; animation-delay: -.5s; }.avatar-visual span i:nth-child(3) { height: 12px; animation-delay: -.8s; }.avatar-visual span i:nth-child(4) { height: 22px; animation-delay: -.2s; }.avatar-visual span i:nth-child(5) { height: 10px; animation-delay: -.65s; }
@keyframes wave { to { height: 7px; } }
.comments-visual { display: grid; gap: 10px; margin: auto 30px 31px; padding: 22px; background: #f7f9fc; border-radius: 17px; }
.comments-visual div { display: flex; justify-content: space-between; align-items: center; padding: 13px 15px; background: #fff; border: 1px solid #e7ebf1; border-radius: 11px; font-size: 12px; }
.comments-visual span { color: #516075; }
.comments-visual b { padding: 5px 8px; color: var(--blue); background: var(--blue-soft); border-radius: 6px; font-size: 9px; font-weight: 650; }
.comments-visual b.risk { color: var(--orange); background: #fff2e9; }
.takeover-card { grid-column: 1 / -1; min-height: 302px; display: grid; grid-template-columns: .85fr 1.15fr; align-items: center; }
.takeover-card .feature-copy { padding: 44px 30px 44px 50px; }
.control-visual { margin: 38px 48px 38px 20px; padding: 26px; background: #172235; border-radius: 19px; box-shadow: 0 17px 46px rgba(19, 31, 50, .18); }
.control-status { display: flex; justify-content: space-between; align-items: center; padding-bottom: 22px; border-bottom: 1px solid rgba(255, 255, 255, .1); }
.control-status span { display: flex; align-items: center; gap: 9px; color: #fff; font-size: 13px; }
.control-status span i { width: 8px; height: 8px; background: #50d598; border-radius: 50%; box-shadow: 0 0 0 5px rgba(80, 213, 152, .1); }
.control-status small { color: #8f9caf; font-size: 10px; }
.control-buttons { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 20px; }
.control-buttons b { padding: 14px 8px; color: #cad3df; background: #222f44; border: 1px solid rgba(255, 255, 255, .07); border-radius: 9px; font-size: 10px; font-weight: 550; text-align: center; }
.control-buttons b.primary-control { color: #fff; background: var(--blue); border-color: var(--blue); }

.reliability-section { display: grid; grid-template-columns: .82fr 1.18fr; align-items: center; gap: 85px; }
.reliability-copy > p { max-width: 500px; }
.reliability-list { display: grid; gap: 22px; margin: 36px 0 0; padding: 0; list-style: none; }
.reliability-list li { display: grid; grid-template-columns: 35px 1fr; gap: 12px; }
.reliability-list i { color: #a0aaba; font-size: 10px; font-style: normal; font-weight: 700; letter-spacing: .08em; }
.reliability-list strong { display: block; margin-bottom: 5px; color: #303c4e; font-size: 14px; }
.reliability-list span { color: var(--muted); font-size: 12px; line-height: 1.7; }
.architecture-card { padding: 25px; background: #f7f9fc; border: 1px solid #e2e8f0; border-radius: 24px; box-shadow: 0 24px 68px rgba(30, 49, 82, .08); }
.arch-head { display: flex; align-items: center; justify-content: space-between; padding: 0 4px 19px; }
.arch-head span { font-size: 14px; font-weight: 700; }
.arch-head b { display: flex; align-items: center; gap: 7px; color: var(--green); font-size: 10px; font-weight: 600; }
.arch-head b i { width: 7px; height: 7px; background: var(--green); border-radius: 50%; }
.arch-row { display: grid; grid-template-columns: 42px 1fr 18px 1fr 18px 1fr; align-items: center; gap: 6px; margin-top: 10px; }
.arch-row .arch-label { color: #8b96a8; font-size: 10px; }
.arch-row div { padding: 17px 8px; color: #536176; background: #fff; border: 1px solid #e2e7ef; border-radius: 10px; font-size: 10px; text-align: center; box-shadow: 0 6px 17px rgba(29, 47, 77, .04); }
.arch-row > i { color: #b5bfcd; font-size: 10px; font-style: normal; text-align: center; }
.arch-note { display: flex; justify-content: center; gap: 26px; margin-top: 21px; padding: 17px 0 2px; border-top: 1px solid #e1e6ee; }
.arch-note span { position: relative; padding-left: 14px; color: #758195; font-size: 10px; }
.arch-note span::before { content: ""; position: absolute; width: 6px; height: 6px; left: 0; top: 4px; background: var(--blue); border-radius: 50%; }

.audience-section { background: #172235; color: #fff; }
.compact-heading { max-width: 800px; }
.audience-section .eyebrow { color: #8eb1ff; }
.audience-section .eyebrow span { background: #8eb1ff; }
.audience-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 50px; }
.audience-grid article { min-height: 234px; padding: 31px; background: rgba(255, 255, 255, .045); border: 1px solid rgba(255, 255, 255, .09); border-radius: 18px; }
.audience-grid span { color: #8eb1ff; font-size: 11px; font-weight: 650; letter-spacing: .05em; }
.audience-grid h3 { margin: 18px 0 12px; font-size: 20px; line-height: 1.5; }
.audience-grid p { margin: 0; color: #9faabc; font-size: 13px; line-height: 1.8; }

.faq-section { display: grid; grid-template-columns: 350px 1fr; align-items: start; gap: 92px; }
.faq-intro { position: sticky; top: 118px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 28px 40px 28px 0; cursor: pointer; list-style: none; font-size: 16px; font-weight: 620; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span::before,
.faq-list summary span::after { content: ""; position: absolute; width: 13px; height: 1.5px; right: 5px; top: 37px; background: #6c7788; transition: transform .2s ease; }
.faq-list summary span::after { transform: rotate(90deg); }
.faq-list details[open] summary span::after { transform: rotate(0); }
.faq-list details p { margin: -7px 50px 27px 0; color: var(--muted); font-size: 13px; line-height: 1.85; }

.cta-section { padding-top: 10px; padding-bottom: 112px; }
.cta-panel { min-height: 300px; display: flex; align-items: center; justify-content: space-between; gap: 70px; padding: 58px 64px; color: #fff; background: linear-gradient(135deg, #2d65ec, #4059d9 55%, #3146b5); border-radius: 27px; box-shadow: 0 26px 70px rgba(47, 91, 213, .22); }
.cta-panel > div:first-child { max-width: 650px; }
.cta-panel > div:first-child > span { color: #cbd9ff; font-size: 12px; font-weight: 650; letter-spacing: .08em; }
.cta-panel h2 { margin: 15px 0 13px; font-size: clamp(30px, 3vw, 42px); line-height: 1.3; letter-spacing: -.04em; }
.cta-panel p { margin: 0; color: #d6e0ff; font-size: 14px; line-height: 1.7; }
.cta-actions { display: grid; gap: 11px; min-width: 222px; }
.button-light { color: #2858cf; background: #fff; box-shadow: 0 12px 28px rgba(18, 38, 99, .18); }
.cta-actions small { color: #c3d0f5; font-size: 9px; line-height: 1.5; text-align: center; }

.site-footer { background: #f7f9fb; border-top: 1px solid var(--line); }
.footer-shell { display: flex; justify-content: space-between; gap: 60px; padding-top: 55px; padding-bottom: 44px; }
.footer-brand { margin-bottom: 17px; }
.footer-shell p { max-width: 480px; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
.footer-links { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: flex-end; gap: 25px; padding-top: 10px; }
.footer-links a { color: #5d697b; font-size: 12px; }
.footer-links a:hover { color: var(--blue); }
.footer-bottom { min-height: 66px; display: flex; align-items: center; justify-content: space-between; color: #909aaa; border-top: 1px solid var(--line); font-size: 10px; }

@media (max-width: 1020px) {
  .desktop-nav { display: none; }
  .hero { grid-template-columns: 1fr 1fr; gap: 24px; }
  .hero-visual { transform: scale(.9); transform-origin: center right; }
  .workflow-grid { grid-template-columns: 1fr 1fr; }
  .reliability-section { gap: 45px; }
  .architecture-card { padding: 20px; }
  .arch-row { grid-template-columns: 35px 1fr 12px 1fr 12px 1fr; }
}

@media (max-width: 780px) {
  :root { --shell: min(100% - 32px, 640px); --radius: 20px; }
  html { scroll-padding-top: 72px; }
  .site-header { height: 64px; }
  .brand { font-size: 16px; }
  .brand-mark { width: 29px; height: 29px; font-size: 15px; }
  .nav-login { display: none; }
  .button-small { min-height: 37px; padding: 0 14px; font-size: 12px; }
  .hero { min-height: 0; display: block; padding-top: 54px; padding-bottom: 48px; }
  .hero h1 { margin-top: 18px; font-size: clamp(39px, 11.5vw, 53px); line-height: 1.15; }
  .hero-lead { font-size: 16px; line-height: 1.75; }
  .hero-actions { display: grid; grid-template-columns: 1fr; }
  .hero-actions .button { width: 100%; }
  .hero-assurance { gap: 10px 14px; }
  .hero-visual { width: min(100%, 430px); min-height: 510px; margin: 48px auto 0; transform: none; }
  .live-frame { width: min(78vw, 330px); height: 495px; right: 0; }
  .product-chip { top: 58px; left: 0; width: 168px; }
  .reply-card { width: min(78vw, 290px); left: 0; bottom: 5px; }
  .proof-inner { padding: 20px 0; display: block; text-align: center; }
  .proof-inner > span { display: block; margin-bottom: 15px; }
  .proof-inner > div { flex-wrap: wrap; justify-content: center; gap: 9px 12px; }
  .proof-inner i { display: none; }
  .proof-inner b { padding: 6px 9px; background: #fff; border: 1px solid var(--line); border-radius: 7px; font-size: 11px; }
  .section { padding-top: 82px; padding-bottom: 82px; }
  .section-heading h2,
  .reliability-copy h2,
  .faq-intro h2 { font-size: 34px; }
  .section-heading p,
  .reliability-copy > p,
  .faq-intro > p { font-size: 14px; }
  .workflow-grid { grid-template-columns: 1fr; gap: 13px; margin-top: 35px; }
  .workflow-card { min-height: 0; padding: 24px; }
  .workflow-card h3 { margin-top: 20px; }
  .split-heading { display: block; }
  .split-heading p { margin-top: 20px; }
  .feature-grid { display: block; margin-top: 35px; }
  .feature-card { min-height: 0; margin-bottom: 16px; }
  .feature-card-wide,
  .takeover-card { display: block; }
  .feature-copy,
  .feature-card-wide .feature-copy,
  .takeover-card .feature-copy { padding: 31px 27px 18px; }
  .feature-copy h3 { font-size: 22px; }
  .knowledge-visual { grid-template-columns: 1fr; gap: 12px; margin: 12px 18px 18px; padding: 15px; }
  .knowledge-arrow { transform: rotate(90deg); }
  .knowledge-source,
  .knowledge-answer { min-height: 0; }
  .avatar-visual { height: 260px; }
  .comments-visual { margin: 18px; }
  .control-visual { margin: 18px; }
  .control-status { display: block; }
  .control-status small { display: block; margin: 10px 0 0 17px; }
  .control-buttons { grid-template-columns: 1fr; }
  .reliability-section { display: block; }
  .architecture-card { margin-top: 45px; padding: 17px; overflow-x: auto; }
  .arch-head,
  .arch-row,
  .arch-note { min-width: 520px; }
  .audience-grid { grid-template-columns: 1fr; margin-top: 34px; }
  .audience-grid article { min-height: 0; }
  .faq-section { display: block; }
  .faq-intro { position: static; margin-bottom: 40px; }
  .cta-section { padding-bottom: 82px; }
  .cta-panel { min-height: 0; display: block; padding: 39px 28px; }
  .cta-actions { margin-top: 30px; }
  .footer-shell { display: block; padding-top: 46px; }
  .footer-links { justify-content: flex-start; margin-top: 30px; gap: 18px 23px; }
  .footer-bottom { min-height: 82px; display: block; padding: 22px 0; }
  .footer-bottom span { display: block; margin: 5px 0; }
}

@media (max-width: 390px) {
  .hero-assurance span { width: 100%; }
  .hero-visual { min-height: 474px; }
  .live-frame { width: 278px; height: 444px; }
  .product-chip { width: 156px; }
  .product-chip img { width: 45px; height: 45px; }
  .reply-card { width: 270px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}