:root {
  color-scheme: light;
  --ink: #1e2025;
  --muted: #696b72;
  --line: #dedfe4;
  --soft: #fff3ee;
  --soft-strong: #ffe4d8;
  --brand: #f45b39;
  --brand-deep: #c93d20;
  --paper: #fffdfc;
  --white: #ffffff;
  --radius-lg: 32px;
  --radius-md: 20px;
  --shadow: 0 22px 60px rgba(105, 42, 20, 0.13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 5%, rgba(255, 190, 164, 0.22), transparent 29rem),
    var(--paper);
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.section-shell,
.site-header {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid rgba(30, 32, 37, 0.08);
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand img,
.footer-brand img {
  border-radius: 12px;
  box-shadow: 0 8px 22px rgba(244, 91, 57, 0.2);
}

.brand span,
.footer-brand span { display: grid; line-height: 1.2; }
.brand strong { font-size: 1.02rem; letter-spacing: 0.01em; }
.brand small,
.footer-brand small { margin-top: 5px; color: var(--muted); font-size: 0.75rem; }

.site-nav { display: flex; align-items: center; gap: 28px; font-size: 0.94rem; }
.site-nav a { color: #51535a; transition: color 180ms ease; }
.site-nav a:hover,
.site-nav a:focus-visible { color: var(--brand-deep); }
.download-menu { position: relative; }
.download-menu summary { list-style: none; cursor: pointer; }
.download-menu summary::-webkit-details-marker { display: none; }
.site-nav .nav-download {
  padding: 9px 18px;
  color: var(--white);
  background: var(--ink);
  border-radius: 999px;
}
.site-nav .nav-download::after {
  content: "⌄";
  margin-left: 7px;
  font-size: .86em;
}
.download-menu[open] .nav-download::after { content: "⌃"; }
.download-menu-panel {
  position: absolute;
  z-index: 12;
  top: calc(100% + 12px);
  right: 0;
  width: min(340px, calc(100vw - 32px));
  padding: 10px;
  display: grid;
  gap: 4px;
  background: rgba(255,255,255,.98);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.download-menu-panel a {
  padding: 12px 14px;
  display: grid;
  gap: 2px;
  border-radius: 12px;
}
.download-menu-panel a:hover,
.download-menu-panel a:focus-visible { background: var(--soft); }
.download-menu-panel strong { color: var(--ink); font-size: .92rem; }
.download-menu-panel small { color: var(--muted); font-size: .76rem; }
.nav-toggle { display: none; }

.hero {
  min-height: 620px;
  padding-block: 54px 66px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.74fr);
  align-items: center;
  gap: clamp(38px, 7vw, 88px);
}

.eyebrow,
.section-kicker {
  margin: 0 0 18px;
  color: var(--brand-deep);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 0.82rem;
}
.eyebrow { display: flex; align-items: center; gap: 10px; }
.eyebrow span { width: 26px; height: 2px; background: var(--brand); }

h1, h2, h3, p { overflow-wrap: anywhere; }
h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(3rem, 5.1vw, 4.55rem);
  line-height: 1.06;
  letter-spacing: -0.065em;
  font-weight: 760;
}
.hero-lead {
  max-width: 670px;
  margin: 28px 0 0;
  color: #56585f;
  font-size: clamp(1.05rem, 1.9vw, 1.28rem);
  line-height: 1.8;
}
.hero-actions { margin-top: 34px; display: flex; gap: 12px; flex-wrap: wrap; }
.button {
  min-height: 50px;
  padding: 12px 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary {
  color: var(--white);
  background: var(--brand);
  box-shadow: 0 12px 28px rgba(244, 91, 57, 0.28);
}
.button-primary:hover { background: var(--brand-deep); }
.button-secondary { border-color: var(--line); background: rgba(255, 255, 255, 0.7); }
.hero-proof { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 10px; }
.hero-proof span {
  padding: 6px 11px;
  color: #5c4138;
  background: var(--soft);
  border-radius: 999px;
  font-size: 0.78rem;
}

.hero-visual {
  position: relative;
  min-height: 500px;
  overflow: hidden;
  border-radius: 150px 150px 32px 32px;
  background: #ffdccc;
  box-shadow: var(--shadow);
}
.hero-visual > img { width: 100%; height: 100%; min-height: 500px; object-fit: cover; }
.visual-caption {
  position: absolute;
  inset: auto 18px 18px;
  padding: 18px 20px;
  display: grid;
  color: var(--white);
  background: rgba(27, 26, 28, 0.72);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 18px;
}
.visual-caption strong { font-size: 1rem; }
.visual-caption span { margin-top: 3px; color: rgba(255,255,255,.75); font-size: 0.84rem; }

.difference { padding-block: 100px 120px; }
.section-heading { max-width: 760px; }
.section-heading h2 {
  margin: 0;
  font-size: clamp(2.3rem, 4.8vw, 4rem);
  line-height: 1.12;
  letter-spacing: -0.045em;
}
.section-heading > p:last-child { max-width: 620px; margin: 22px 0 0; color: var(--muted); font-size: 1.05rem; }

.advantage-grid {
  margin-top: 50px;
  display: grid;
  grid-template-columns: 1.22fr 0.89fr 0.89fr;
  gap: 18px;
}
.advantage-card {
  min-height: 320px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,.82);
}
.advantage-card-featured { background: var(--ink); color: var(--white); border-color: var(--ink); }
.card-index { color: var(--brand); font-size: 0.8rem; font-weight: 800; }
.advantage-card h3 { margin: auto 0 10px; font-size: 1.4rem; line-height: 1.3; }
.advantage-card p { margin: 0; color: var(--muted); }
.advantage-card-featured p { color: rgba(255,255,255,.65); }
.mini-flow { margin-top: 26px; display: grid; grid-template-columns: auto 1fr auto 1fr auto; align-items: center; gap: 8px; font-size: 0.75rem; }
.mini-flow i { height: 1px; background: rgba(255,255,255,.2); }
.mini-flow b { padding: 6px 9px; color: var(--white); background: var(--brand); border-radius: 999px; }

.integrations {
  padding-block: 110px;
  color: var(--white);
  background: var(--ink);
  overflow: hidden;
}
.integrations-inner { display: grid; grid-template-columns: minmax(280px, .72fr) minmax(0, 1.28fr); align-items: center; gap: 70px; }
.integrations-heading h2 { font-size: clamp(2.4rem, 4.4vw, 4.2rem); }
.integrations-heading > p:last-child { color: rgba(255,255,255,.58); }
.app-marquee { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.app-pill {
  min-height: 94px;
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 15px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 20px;
  background: rgba(255,255,255,.07);
}
.app-pill img { width: 52px; height: 52px; object-fit: contain; border-radius: 14px; background: #fff; }
.app-pill span { display: grid; }
.app-pill strong { font-size: .98rem; }
.app-pill small { margin-top: 4px; color: rgba(255,255,255,.5); font-size: .78rem; }

.scenarios { padding-block: 115px; }
.scenario-grid { margin-top: 48px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.scenario-card { min-height: 520px; padding: 34px; display: flex; flex-direction: column; border-radius: var(--radius-lg); overflow: hidden; }
.scenario-knowledge { background: var(--soft); }
.scenario-meeting { color: var(--white); background: var(--brand); }
.scenario-number { margin-bottom: auto; font-size: .78rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.scenario-card h3 { max-width: 530px; margin: 34px 0 14px; font-size: clamp(1.75rem, 3vw, 2.55rem); line-height: 1.18; letter-spacing: -.035em; }
.scenario-card p { margin: 0; color: #6a5e59; }
.scenario-meeting p { color: rgba(255,255,255,.72); }
.scenario-demo { margin-top: 38px; padding: 18px; background: var(--white); border: 1px solid rgba(244,91,57,.16); border-radius: 18px; box-shadow: 0 18px 36px rgba(111,51,30,.08); }
.demo-label { color: var(--brand-deep); font-size: .75rem; font-weight: 800; }
.demo-row { margin-top: 13px; display: grid; grid-template-columns: 9px 1fr auto; align-items: center; gap: 10px; }
.demo-row i { width: 9px; height: 9px; border-radius: 50%; background: var(--brand); }
.demo-row b { font-size: .9rem; }
.demo-row em { color: var(--muted); font-size: .72rem; font-style: normal; }
.demo-answer { margin-top: 13px; padding-top: 13px; border-top: 1px solid var(--line); color: #54565b; font-size: .85rem; }
.meeting-flow { margin: 38px 0 0; padding: 0; display: grid; gap: 1px; list-style: none; border-radius: 18px; overflow: hidden; }
.meeting-flow li { padding: 14px 16px; display: flex; gap: 12px; align-items: center; color: var(--ink); background: rgba(255,255,255,.9); font-weight: 700; }
.meeting-flow span { color: var(--brand-deep); font-size: .72rem; }

.skills { padding-block: 40px 120px; display: grid; grid-template-columns: minmax(280px,.75fr) minmax(0,1.25fr); gap: 80px; align-items: start; }
.skills-intro { position: sticky; top: 28px; }
.skills-intro h2 { margin: 0; font-size: clamp(2.3rem, 4vw, 3.8rem); line-height: 1.12; letter-spacing: -.045em; }
.skills-intro > p:last-child { margin-top: 22px; color: var(--muted); }
.skill-list { border-top: 1px solid var(--line); }
.skill-list article { min-height: 132px; padding: 24px 0; display: grid; grid-template-columns: 50px 1fr; gap: 18px; align-items: start; border-bottom: 1px solid var(--line); }
.skill-list > article > span { color: var(--brand); font-size: .78rem; font-weight: 800; }
.skill-list h3 { margin: 0; font-size: 1.18rem; }
.skill-list p { margin: 7px 0 0; color: var(--muted); }

.how { padding-block: 110px; border-top: 1px solid var(--line); }
.steps { margin: 52px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; list-style: none; }
.steps li { min-height: 260px; padding: 24px; display: flex; flex-direction: column; border-radius: 18px; background: #f3f3f4; }
.steps li > span { color: var(--brand); font-weight: 800; font-size: .78rem; }
.steps li div { margin-top: auto; }
.steps h3 { margin: 0 0 8px; font-size: 1.08rem; }
.steps p { margin: 0; color: var(--muted); font-size: .9rem; }

.closing { margin-block: 20px 110px; padding: 55px; display: grid; grid-template-columns: 1.3fr .7fr; gap: 40px; align-items: end; color: var(--white); background: var(--ink); border-radius: var(--radius-lg); }
.closing h2 { max-width: 720px; margin: 0; font-size: clamp(2.2rem,4vw,3.8rem); line-height: 1.12; letter-spacing: -.045em; }
.closing-action { justify-self: end; text-align: right; }
.closing-action p { margin: 0 0 18px; color: rgba(255,255,255,.65); }
.button-light { color: var(--ink); background: var(--white); }

/* Download page */
.download-page { background: var(--paper); }
.download-hero { padding-block: 88px 46px; text-align: center; }
.download-hero .eyebrow { justify-content: center; }
.download-hero h1 { max-width: 1050px; margin-inline: auto; font-size: clamp(3rem, 6vw, 5rem); }
.download-hero > p:last-child { max-width: 650px; margin: 24px auto 0; color: var(--muted); font-size: 1.05rem; }
.download-list { padding-block: 30px 110px; }
.download-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.download-card { min-height: 490px; padding: 28px; display: flex; flex-direction: column; scroll-margin-top: 24px; border: 1px solid var(--line); border-radius: 26px; background: var(--white); box-shadow: 0 16px 44px rgba(30,32,37,.06); }
.platform-mark { width: 58px; height: 58px; display: grid; place-items: center; color: var(--white); background: var(--brand); border-radius: 17px; font-size: 1.55rem; font-weight: 800; box-shadow: 0 12px 24px rgba(244,91,57,.22); }
.platform-mark-dark { background: var(--ink); box-shadow: none; }
.platform-mark-blue { background: #2374e8; box-shadow: 0 12px 24px rgba(35,116,232,.18); }
.download-copy { margin-top: 44px; }
.download-card-top { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: .76rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.download-card-top b { padding: 3px 7px; color: var(--brand-deep); background: var(--soft); border-radius: 999px; letter-spacing: 0; }
.download-card h3 { margin: 10px 0 5px; font-size: 1.65rem; }
.download-card p { margin: 0; color: var(--muted); }
.download-card dl { margin: 30px 0 0; padding-top: 18px; border-top: 1px solid var(--line); }
.download-card dl div { display: flex; justify-content: space-between; gap: 20px; padding-block: 6px; }
.download-card dt { color: var(--muted); }
.download-card dd { margin: 0; text-align: right; }
.download-button { margin-top: auto; width: 100%; border-radius: 14px; color: var(--white); background: var(--ink); }
.download-button.is-disabled { cursor: not-allowed; color: #98999e; background: #ececef; box-shadow: none; }
.download-note { max-width: 720px; margin: 22px auto 0; color: var(--muted); text-align: center; font-size: .84rem; }
.install { padding-block: 110px; display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; border-top: 1px solid var(--line); }
.install-copy h2 { margin: 0; font-size: clamp(2.3rem,4vw,3.8rem); line-height: 1.12; letter-spacing: -.045em; }
.install-copy > p:last-child { margin-top: 22px; color: var(--muted); }
.install-steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.install-steps li { padding: 22px 0; display: grid; grid-template-columns: 44px 1fr; gap: 16px; border-bottom: 1px solid var(--line); }
.install-steps > li > span { width: 32px; height: 32px; display: grid; place-items: center; color: var(--brand-deep); background: var(--soft); border-radius: 50%; font-weight: 800; font-size: .82rem; }
.install-steps h3 { margin: 0; font-size: 1.06rem; }
.install-steps p { margin: 5px 0 0; color: var(--muted); font-size: .9rem; }
.download-help { margin-bottom: 110px; padding: 40px; display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: end; border-radius: 24px; background: var(--soft); }
.download-help h2 { margin: 0; font-size: clamp(1.8rem,3vw,2.8rem); line-height: 1.16; }
.download-help > p { margin: 0; color: #6a5e59; }

.site-footer {
  padding-block: 30px;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}
.footer-brand strong { color: var(--ink); font-size: 0.9rem; }
.site-footer p { margin: 0; color: var(--ink); font-weight: 700; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .hero-visual { min-height: 480px; max-width: 560px; width: 100%; justify-self: center; border-radius: 100px 100px 28px 28px; }
  .hero-visual > img { min-height: 480px; }
  .advantage-grid { grid-template-columns: 1fr 1fr; }
  .advantage-card-featured { grid-column: 1 / -1; }
  .integrations-inner, .skills, .install { grid-template-columns: 1fr; gap: 48px; }
  .skills-intro { position: static; }
  .steps { grid-template-columns: 1fr 1fr; }
  .closing { grid-template-columns: 1fr; }
  .closing-action { justify-self: start; text-align: left; }
  .download-grid { grid-template-columns: 1fr 1fr; }
  .download-card:last-child { grid-column: 1 / -1; }
}

@media (max-width: 700px) {
  .section-shell,
  .site-header { width: min(100% - 28px, 1180px); }
  .site-header { min-height: 72px; position: relative; }
  .brand small { display: none; }
  .nav-toggle {
    width: 44px;
    height: 44px;
    display: grid;
    place-content: center;
    gap: 6px;
    border: 0;
    border-radius: 50%;
    background: var(--soft);
  }
  .nav-toggle span:not(.sr-only) { width: 20px; height: 2px; background: var(--ink); transition: transform 180ms ease; }
  .site-nav {
    position: absolute;
    z-index: 5;
    inset: calc(100% + 1px) 0 auto;
    padding: 18px;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 5px;
    background: rgba(255,253,252,.98);
    border: 1px solid var(--line);
    border-radius: 0 0 20px 20px;
    box-shadow: var(--shadow);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 10px 12px; }
  .site-nav .nav-download { text-align: center; }
  .download-menu { width: 100%; }
  .download-menu .nav-download { display: block; }
  .download-menu-panel {
    position: static;
    width: 100%;
    margin-top: 8px;
    border-radius: 14px;
    box-shadow: none;
  }
  .hero { min-height: auto; padding-block: 56px 72px; gap: 46px; }
  h1 { font-size: clamp(2.65rem, 13vw, 4rem); }
  .hero-lead { margin-top: 22px; }
  .hero-actions { align-items: stretch; }
  .button { flex: 1 1 145px; }
  .hero-visual { min-height: 440px; border-radius: 72px 72px 24px 24px; }
  .hero-visual > img { min-height: 440px; }
  .difference { padding-block: 76px 90px; }
  .advantage-grid { grid-template-columns: 1fr; }
  .advantage-card-featured { grid-column: auto; }
  .advantage-card { min-height: 270px; }
  .integrations { padding-block: 82px; }
  .app-marquee { grid-template-columns: 1fr; }
  .scenario-grid { grid-template-columns: 1fr; }
  .scenario-card { min-height: 480px; padding: 26px; }
  .scenario-card h3 { font-size: 1.85rem; }
  .skills { padding-bottom: 90px; }
  .steps { grid-template-columns: 1fr; }
  .steps li { min-height: 210px; }
  .closing { margin-bottom: 80px; padding: 34px 26px; }
  .download-hero { padding-top: 62px; }
  .download-grid { grid-template-columns: 1fr; }
  .download-card:last-child { grid-column: auto; }
  .download-card { min-height: 460px; }
  .install { padding-block: 80px; }
  .download-help { grid-template-columns: 1fr; gap: 24px; padding: 28px; }
  .site-footer { grid-template-columns: 1fr; gap: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}