:root {
  --accent: #4a9fd8;
  --ink: #1a1a1a;
  --muted: #666666;
  --canvas: #ffffff;
  --line: #eef0f2;
  --soft: #f7f8fa;
  --shadow: 0 2px 4px rgba(0, 0, 0, 0.03), 0 12px 32px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: Inter, Geist, "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
p {
  margin: 0;
  overflow-wrap: anywhere;
}

h1,
h2 {
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  letter-spacing: 0;
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1200px, calc(100% - 48px));
  height: 84px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.84);
  backdrop-filter: blur(18px);
}

.top-nav.is-scrolled {
  border-bottom: 1px solid rgba(238, 240, 242, 0.8);
}

.brand,
.nav-links,
.nav-cta,
.primary-cta,
.secondary-cta {
  display: inline-flex;
  align-items: center;
}

.brand {
  gap: 12px;
  font-size: 18px;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 4px;
  color: #ffffff;
  background: var(--ink);
  font-size: 18px;
  line-height: 1;
}

.nav-links {
  gap: 30px;
  color: var(--muted);
  font-family: Geist, Inter, sans-serif;
  font-size: 14px;
}

.nav-links a:hover {
  color: var(--ink);
}

.nav-cta {
  justify-content: center;
  width: 112px;
  height: 40px;
  border-radius: 9999px;
  color: #ffffff;
  background: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.hero {
  display: grid;
  justify-items: center;
  gap: 56px;
  padding: 56px max(24px, calc((100vw - 1200px) / 2)) 0;
}

.hero-copy {
  display: grid;
  justify-items: center;
  gap: 22px;
  width: min(860px, 100%);
  text-align: center;
}

.eyebrow {
  color: var(--muted);
  font-family: "Funnel Sans", Inter, sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.8px;
  line-height: 1.25;
}

.hero h1 {
  font-size: clamp(46px, 6.2vw, 72px);
  line-height: 1.04;
}

.hero-lead {
  width: min(720px, 100%);
  color: var(--muted);
  font-family: Geist, Inter, sans-serif;
  font-size: 19px;
  line-height: 1.55;
}

.primary-cta,
.secondary-cta {
  justify-content: center;
  border-radius: 9999px;
  font-family: Geist, Inter, sans-serif;
  font-weight: 700;
  white-space: nowrap;
}

.primary-cta {
  gap: 10px;
  min-width: 168px;
  height: 52px;
  padding: 0 28px;
  color: #ffffff;
  background: var(--accent);
  box-shadow: var(--shadow);
  font-size: 16px;
}

.primary-cta:hover {
  background: #398fc8;
}

.trust-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 42px;
  min-height: 34px;
  width: min(1200px, 100%);
  color: var(--ink);
}

.trust-strip span {
  color: var(--muted);
  font-family: "Funnel Sans", Inter, sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
}

.trust-strip strong {
  opacity: 0.72;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 1.4px;
}

.workflow-lead {
  display: grid;
  justify-items: center;
  gap: 26px;
  width: min(920px, calc(100% - 48px));
  margin: 56px auto 0;
  text-align: center;
}

.workflow-lead h2 {
  width: 100%;
  font-size: clamp(34px, 4vw, 44px);
  line-height: 1.12;
}

.secondary-cta {
  gap: 8px;
  width: 152px;
  height: 44px;
  color: #ffffff;
  background: var(--ink);
  font-size: 14px;
}

.feature-icons {
  display: grid;
  grid-template-columns: repeat(4, minmax(130px, 1fr));
  justify-content: center;
  gap: 54px;
  width: 100%;
}

.feature-icons article {
  display: grid;
  justify-items: center;
  gap: 10px;
}

.line-icon {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  color: var(--ink);
  font-size: 22px;
  line-height: 1;
}

.feature-icons h3 {
  color: var(--muted);
  font-family: "Funnel Sans", Inter, sans-serif;
  font-size: 13px;
  font-weight: 600;
}

.device-cascade {
  position: relative;
  width: min(1200px, calc(100% - 48px));
  height: 860px;
  margin: 56px auto 0;
  overflow: hidden;
}

.device {
  position: absolute;
  padding: 14px;
  border-radius: 12px;
  background: var(--ink);
  box-shadow: var(--shadow);
}

.screen,
.phone-screen {
  width: 100%;
  height: 100%;
  border-radius: 4px;
  background: #ffffff;
}

.back-device {
  top: 28px;
  left: 230px;
  width: 830px;
  height: 520px;
  transform: rotate(-3deg);
}

.front-device {
  top: 168px;
  left: 400px;
  z-index: 2;
  width: 760px;
  height: 500px;
  transform: rotate(4deg);
}

.phone-device {
  top: 220px;
  left: 150px;
  z-index: 3;
  width: 330px;
  height: 560px;
  padding: 12px;
  transform: rotate(-8deg);
}

.desktop-back,
.front-screen {
  display: grid;
  gap: 18px;
  padding: 18px;
}

.screen-header,
.panel-top,
.phone-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.screen-header strong,
.panel-top strong,
.phone-top strong {
  font-size: 15px;
}

.screen-header span,
.panel-top span,
.phone-top span,
.live-rail span,
.now-card span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.8px;
}

.desktop-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  height: 100%;
}

.metric-card,
.bar-card,
.note-card {
  border-radius: 4px;
  background: var(--soft);
  padding: 18px;
}

.metric-card strong {
  display: block;
  margin-top: 12px;
  font-size: 44px;
  line-height: 1;
}

.bar-card {
  display: flex;
  align-items: end;
  justify-content: center;
  gap: 14px;
}

.bar-card span,
.pulse-bars i {
  display: block;
  width: 52px;
  border-radius: 3px 3px 0 0;
  background: var(--accent);
}

.bar-card span:nth-child(1) {
  height: 84px;
  background: #222222;
}

.bar-card span:nth-child(2) {
  height: 132px;
}

.bar-card span:nth-child(3) {
  height: 72px;
  background: #444444;
}

.note-card {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 18px;
}

.front-screen {
  grid-template-columns: 250px 1fr;
}

.live-rail {
  display: grid;
  align-content: start;
  gap: 14px;
  padding: 16px;
  border-radius: 4px;
  color: #ffffff;
  background: var(--ink);
}

.live-rail span {
  color: #ffffff;
}

.live-rail strong {
  font-size: 38px;
  line-height: 1;
}

.live-rail p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

.pulse-bars {
  display: flex;
  align-items: end;
  gap: 10px;
  height: 120px;
  margin-top: 24px;
}

.pulse-bars i {
  width: 54px;
}

.pulse-bars i:nth-child(1) {
  height: 62px;
  background: #242424;
}

.pulse-bars i:nth-child(2) {
  height: 88px;
}

.pulse-bars i:nth-child(3) {
  height: 54px;
  background: #444444;
}

.assistant-panel {
  display: grid;
  align-content: start;
  gap: 28px;
  padding: 18px 4px 18px 0;
}

.assistant-line {
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.65;
}

.task-list,
.phone-steps {
  display: grid;
  gap: 10px;
}

.task-list span,
.phone-steps span {
  display: block;
  border-radius: 4px;
  color: var(--muted);
  background: var(--soft);
  padding: 12px 14px;
  font-size: 13px;
}

.phone-screen {
  display: grid;
  align-content: start;
  gap: 16px;
  padding: 18px;
  border-radius: 12px;
}

.now-card {
  display: grid;
  gap: 10px;
  min-height: 162px;
  padding: 16px;
  border-radius: 4px;
  color: #ffffff;
  background: var(--ink);
}

.now-card span,
.now-card p {
  color: rgba(255, 255, 255, 0.72);
}

.now-card strong {
  font-size: 22px;
  line-height: 1.25;
}

.capability-band,
.detail-band,
.scene-band,
.platform-band,
.download-band {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
  padding: 92px 0;
}

.capability-band,
.detail-band,
.platform-band {
  border-top: 1px solid var(--line);
}

.capability-band h2,
.detail-band h2,
.scene-band h2,
.platform-band h2,
.download-band h2 {
  max-width: 920px;
  margin-top: 14px;
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.12;
}

.capability-grid,
.detail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 42px;
  background: var(--line);
}

.capability-grid article,
.detail-grid article {
  min-height: 230px;
  padding: 28px;
  background: #ffffff;
}

.capability-grid article.wide {
  grid-column: span 3;
  min-height: 150px;
}

.capability-grid span,
.detail-grid span {
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
}

.capability-grid h3,
.detail-grid h3 {
  margin-top: 24px;
  font-size: 24px;
}

.capability-grid p,
.detail-grid p,
.platform-band p,
.download-band p {
  max-width: 680px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 17px;
}

.scene-band {
  display: grid;
  justify-items: center;
  text-align: center;
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  width: 100%;
  margin-top: 42px;
  background: var(--line);
  text-align: left;
}

.scene-grid article {
  min-height: 260px;
  padding: 30px;
  background: #ffffff;
}

.scene-grid span {
  color: var(--accent);
  font-family: "Funnel Sans", Inter, sans-serif;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1px;
}

.scene-grid h3 {
  max-width: 520px;
  margin-top: 22px;
  font-size: 28px;
  line-height: 1.18;
}

.scene-grid p {
  max-width: 560px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 16px;
}

.platform-list {
  display: grid;
  gap: 14px;
  max-width: 760px;
  margin-top: 34px;
  color: var(--muted);
  font-size: 17px;
}

.platform-list span {
  display: block;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.download-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  border-top: 1px solid var(--line);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
  padding: 28px 0 42px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 1100px) {
  .device-cascade {
    height: 760px;
  }

  .back-device {
    left: 12%;
  }

  .front-device {
    left: 28%;
    width: 68%;
  }

  .phone-device {
    left: 4%;
  }
}

@media (max-width: 840px) {
  .top-nav {
    width: min(100% - 32px, 1200px);
    height: 72px;
  }

  .nav-links {
    display: none;
  }

  .hero {
    gap: 42px;
    padding-top: 42px;
  }

  .hero h1 {
    font-size: 46px;
  }

  .trust-strip {
    gap: 22px;
  }

  .feature-icons,
  .capability-grid,
  .detail-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .capability-grid article.wide {
    grid-column: span 2;
  }

  .device-cascade {
    height: auto;
    overflow: visible;
  }

  .device {
    position: relative;
    inset: auto;
    width: 100%;
    max-width: 720px;
    height: auto;
    min-height: 420px;
    margin: 0 auto 24px;
    transform: none;
  }

  .phone-device {
    max-width: 360px;
    min-height: 520px;
  }

  .front-screen {
    grid-template-columns: 1fr;
  }

  .download-band {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .top-nav,
  .workflow-lead,
  .device-cascade,
  .capability-band,
  .detail-band,
  .scene-band,
  .platform-band,
  .download-band,
  .site-footer {
    width: calc(100% - 32px);
  }

  .brand {
    font-size: 16px;
  }

  .nav-cta {
    width: 96px;
  }

  .hero {
    padding-inline: 16px;
  }

  .hero h1 {
    font-size: 38px;
  }

  .hero-lead {
    font-size: 17px;
  }

  .feature-icons,
  .capability-grid,
  .scene-grid,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .capability-grid article.wide {
    grid-column: auto;
  }

  .front-device,
  .back-device {
    min-height: 520px;
  }

  .desktop-grid {
    grid-template-columns: 1fr;
  }

  .note-card {
    grid-column: auto;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }
}