:root {
  --page: #ffffff;
  --hero: #e9f5ff;
  --line: #dcebf7;
  --text: #222831;
  --muted: #73808c;
  --blue: #2382ff;
  --blue-dark: #136ee8;
  --green: #0ecb67;
  --green-dark: #06a852;
  --cyan: #08a3c8;
  --orange: #ffb046;
  --purple: #9d6dff;
  --red: #ff5e77;
  --shadow: 0 18px 45px rgba(30, 96, 150, 0.16);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--page);
  color: var(--text);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 64px;
  background: rgba(232, 244, 255, 0.96);
  border-top: 1px solid #cfddeb;
  backdrop-filter: blur(12px);
}

.nav-wrap {
  width: min(1000px, calc(100% - 32px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  min-width: 132px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

.brand-mark {
  width: 58px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
}

.brand-text {
  color: #2e343a;
  font-size: 24px;
  font-weight: 900;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 58px;
  font-size: 16px;
}

.nav-links a {
  position: relative;
  white-space: nowrap;
  padding: 22px 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 14px;
  width: 0;
  height: 2px;
  background: var(--blue);
  transform: translateX(-50%);
  transition: width 0.2s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 8px 18px rgba(58, 112, 160, 0.14);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: #1f2d3d;
}

.hero {
  min-height: 472px;
  padding: 44px 0 54px;
  background: var(--hero);
  overflow: hidden;
}

.hero-inner {
  width: min(1060px, calc(100% - 40px));
  min-height: 330px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  align-items: center;
  gap: 68px;
}

.hero-carousel {
  position: relative;
  min-width: 0;
  overflow: hidden;
}

.carousel-track {
  position: relative;
  aspect-ratio: 920 / 520;
  overflow: hidden;
}

.hero-slide {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  transition: opacity 0.36s ease;
  pointer-events: none;
}

.hero-slide.active {
  opacity: 1;
  pointer-events: auto;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 18px 34px rgba(40, 86, 128, 0.14));
}

.carousel-control {
  position: absolute;
  top: 50%;
  z-index: 3;
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  color: var(--blue);
  box-shadow: 0 8px 18px rgba(44, 92, 130, 0.18);
  cursor: pointer;
  transform: translateY(-50%);
}

.carousel-control::before {
  content: "";
  position: absolute;
  top: 12px;
  width: 12px;
  height: 12px;
  border-top: 3px solid currentColor;
  border-left: 3px solid currentColor;
}

.carousel-control.prev {
  left: 8px;
}

.carousel-control.prev::before {
  left: 15px;
  transform: rotate(-45deg);
}

.carousel-control.next {
  right: 8px;
}

.carousel-control.next::before {
  right: 15px;
  transform: rotate(135deg);
}

.slider-dots {
  position: absolute;
  left: 50%;
  bottom: 16px;
  z-index: 3;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}

.slider-dots button {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: #b5c5d2;
  cursor: pointer;
}

.slider-dots .active {
  background: var(--blue);
}

.hero-copy {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 15px;
  font-weight: 700;
}

.hero-copy h1 {
  margin: 0 0 14px;
  color: #30363d;
  font-size: 52px;
  line-height: 1.12;
  font-weight: 500;
}

.lead {
  margin: 0 0 38px;
  color: #4d5a65;
  font-size: 18px;
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 18px;
}

.btn {
  min-width: 200px;
  min-height: 60px;
  padding: 0 28px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 26px;
  font-weight: 700;
  box-shadow: 0 8px 14px rgba(21, 104, 218, 0.24);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 20px rgba(21, 104, 218, 0.28);
}

.btn.primary {
  background: linear-gradient(180deg, var(--blue), var(--blue-dark));
}

.btn.success {
  background: linear-gradient(180deg, var(--green), var(--green-dark));
  box-shadow: 0 8px 14px rgba(4, 159, 77, 0.24);
}

.qr-icon {
  width: 20px;
  height: 20px;
  margin-left: 8px;
  display: inline-block;
  background:
    linear-gradient(#fff 0 0) left top / 7px 7px no-repeat,
    linear-gradient(#fff 0 0) right top / 7px 7px no-repeat,
    linear-gradient(#fff 0 0) left bottom / 7px 7px no-repeat,
    linear-gradient(#fff 0 0) right bottom / 7px 7px no-repeat,
    linear-gradient(#fff 0 0) center / 5px 5px no-repeat;
}

.note {
  margin: 0;
  max-width: 520px;
  color: #8b949d;
  font-size: 14px;
  line-height: 1.6;
}

.note a {
  color: #4f6f8f;
}

.feature-switch {
  width: min(900px, 100%);
  min-height: 236px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}

.feature-card {
  position: relative;
  min-height: 236px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 48px;
  color: #111;
}

.feature-card.active {
  background: #edf8ff;
}

.feature-card.active::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: #48a0ff;
}

.feature-card.active::after {
  content: "";
  position: absolute;
  top: -9px;
  left: 50%;
  width: 18px;
  height: 18px;
  background: #48a0ff;
  transform: translateX(-50%) rotate(45deg);
}

.feature-icon {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  display: inline-grid;
  place-items: center;
  background: #c5e6ff;
  box-shadow: inset 0 0 0 4px #a4c2ff;
  position: relative;
}

.robot-icon::before {
  content: "";
  width: 28px;
  height: 24px;
  border: 3px solid #fff;
  border-radius: 7px;
  box-shadow: inset 0 0 0 2px rgba(72, 160, 255, 0.35);
}

.robot-icon::after {
  content: "";
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 12px 0 0 #fff;
}

.contact-icon::before {
  content: "";
  width: 30px;
  height: 20px;
  border: 3px solid #fff;
  border-radius: 10px;
}

.contact-icon::after {
  content: "";
  position: absolute;
  left: 31px;
  top: 35px;
  width: 10px;
  height: 10px;
  border-left: 3px solid #fff;
  border-bottom: 3px solid #fff;
  transform: rotate(-20deg);
}

.content-section {
  width: min(1000px, calc(100% - 40px));
  margin: 0 auto;
  padding: 86px 0;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 78px;
}

.section-copy h2,
.contact-copy h2 {
  margin: 0 0 24px;
  font-size: 42px;
  line-height: 1.15;
  font-weight: 500;
}

.section-copy p,
.contact-copy p {
  margin: 0;
  max-width: 520px;
  color: #2f3f4f;
  font-size: 18px;
  line-height: 1.5;
}

.product-preview {
  position: relative;
  min-height: 320px;
  justify-self: center;
  width: min(500px, 100%);
}

.dashboard-card {
  position: absolute;
  left: 118px;
  top: 36px;
  width: 370px;
  height: 248px;
  border: 5px solid rgba(198, 226, 248, 0.72);
  border-radius: 10px;
  background: #fff;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.dash-top {
  height: 34px;
  background: linear-gradient(90deg, #079fc8, #0788bd);
}

.dash-top::before {
  content: "";
  display: block;
  width: 210px;
  height: 10px;
  margin: 12px auto 0;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
}

.dash-grid {
  padding: 26px 24px;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 18px 20px;
}

.dash-grid span {
  height: 24px;
  border-radius: 6px;
  background: #eef5fa;
}

.dash-grid span:nth-child(1),
.dash-grid span:nth-child(4) {
  background: #e2f5dc;
}

.phone-card {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  width: 152px;
  height: 306px;
  padding: 0 9px;
  border: 7px solid #d5efff;
  border-radius: 24px;
  background: #f7fbff;
  box-shadow: var(--shadow);
}

.phone-top {
  height: 34px;
  margin: 0 -9px;
  border-radius: 17px 17px 0 0;
  background: linear-gradient(90deg, #098ec1, #06a8c9);
}

.phone-top::after {
  content: "";
  display: block;
  width: 38px;
  height: 6px;
  margin: 9px auto 0;
  border-radius: 9px;
  background: #f7fbff;
}

.phone-title {
  height: 36px;
  display: grid;
  place-items: center;
  color: #354453;
  font-size: 12px;
  font-weight: 700;
}

.room {
  display: block;
  min-height: 34px;
  margin-bottom: 9px;
  padding-left: 11px;
  border-radius: 7px;
  color: #fff;
  font-size: 12px;
  line-height: 34px;
}

.room.red {
  background: var(--red);
}

.room.orange {
  background: var(--orange);
}

.room.blue {
  background: #3f9cff;
}

.room.purple {
  background: var(--purple);
}

.keyword-band {
  width: min(1000px, calc(100% - 40px));
  margin: 0 auto 76px;
  padding: 24px 26px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  background: #f4f9fd;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.keyword-band span {
  min-height: 34px;
  padding: 7px 13px;
  border-radius: 6px;
  background: #fff;
  color: #365064;
  font-size: 15px;
  box-shadow: 0 5px 14px rgba(30, 96, 150, 0.08);
}

.contact-section {
  width: min(1000px, calc(100% - 40px));
  margin: 0 auto 76px;
  padding: 48px 52px;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: 46px;
  background: #edf8ff;
  border: 1px solid #d4eafb;
  border-radius: 8px;
}

.contact-list {
  display: grid;
  gap: 14px;
}

.contact-list a {
  min-height: 58px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  border-radius: 8px;
  background: #fff;
  color: #314455;
  box-shadow: 0 8px 20px rgba(30, 96, 150, 0.1);
}

.contact-list strong {
  color: #17202a;
  font-weight: 700;
}

.contact-badge {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
}

.contact-dock {
  position: fixed;
  right: 30px;
  bottom: 30px;
  z-index: 30;
  display: grid;
  gap: 12px;
}

.dock-btn {
  position: relative;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #fff;
  color: var(--blue);
  box-shadow: 0 5px 14px rgba(23, 47, 74, 0.18);
  cursor: pointer;
}

.dock-btn::before {
  content: attr(data-tip);
  position: absolute;
  right: 56px;
  top: 50%;
  width: max-content;
  max-width: 120px;
  padding: 6px 9px;
  border-radius: 5px;
  background: #1f2a36;
  color: #fff;
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-50%);
  transition: opacity 0.16s ease;
}

.dock-btn:hover::before {
  opacity: 1;
}

.dock-icon {
  width: 22px;
  height: 22px;
  display: inline-block;
  position: relative;
}

.mail-icon::before {
  content: "";
  position: absolute;
  inset: 3px 1px;
  border: 3px solid currentColor;
  border-radius: 5px;
}

.mail-icon::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-left: 3px solid currentColor;
  border-bottom: 3px solid currentColor;
  transform: rotate(-45deg);
}

.qq-icon {
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 800;
}

.plane-icon::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 3px;
  width: 20px;
  height: 16px;
  background: currentColor;
  clip-path: polygon(0 46%, 100% 0, 70% 100%, 50% 60%, 34% 76%);
}

.up-icon::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-left: 3px solid currentColor;
  border-top: 3px solid currentColor;
  transform: rotate(45deg);
}

.up-icon::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  width: 3px;
  height: 14px;
  border-radius: 2px;
  background: currentColor;
}

.site-footer {
  min-height: 52px;
  padding: 14px 20px;
  display: grid;
  place-items: center;
  background: #f4f4f4;
  color: #9ba2a8;
  font-size: 14px;
  text-align: center;
}

@media (max-width: 980px) {
  .nav-links {
    gap: 28px;
  }

  .hero-inner,
  .split {
    gap: 42px;
  }

  .dashboard-card {
    width: 338px;
    left: 116px;
  }
}

@media (max-width: 820px) {
  .site-header {
    height: 58px;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 58px;
    left: 0;
    right: 0;
    display: none;
    grid-template-columns: 1fr;
    gap: 0;
    background: rgba(247, 251, 255, 0.98);
    border-bottom: 1px solid var(--line);
  }

  .nav-links.open {
    display: grid;
  }

  .nav-links a {
    padding: 15px 24px;
    border-top: 1px solid var(--line);
  }

  .nav-links a::after {
    display: none;
  }

  .hero {
    padding: 28px 0 40px;
  }

  .hero-inner,
  .split,
  .contact-section {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-carousel {
    width: 100%;
    max-width: 640px;
    margin: 0 auto;
  }

  .hero-copy h1 {
    font-size: 40px;
  }

  .hero-actions {
    justify-content: center;
  }

  .note,
  .section-copy p,
  .contact-copy p {
    margin-left: auto;
    margin-right: auto;
  }

  .feature-switch {
    min-height: 190px;
  }

  .feature-card {
    min-height: 190px;
    gap: 28px;
  }

  .content-section {
    padding: 62px 0;
  }

  .product-preview {
    min-height: 300px;
  }

  .contact-section {
    padding: 40px 28px;
  }
}

@media (max-width: 560px) {
  .nav-wrap {
    width: calc(100% - 24px);
  }

  .brand {
    min-width: auto;
  }

  .brand-mark {
    width: 48px;
    height: 38px;
  }

  .brand-text {
    font-size: 21px;
  }

  .hero-inner,
  .content-section,
  .keyword-band,
  .contact-section {
    width: calc(100% - 28px);
  }

  .hero-inner {
    gap: 18px;
  }

  .carousel-control {
    display: none;
  }

  .hero-copy h1 {
    font-size: 36px;
  }

  .lead {
    margin-bottom: 24px;
    font-size: 16px;
  }

  .btn {
    width: 100%;
    min-width: 0;
    min-height: 54px;
    font-size: 22px;
  }

  .feature-switch {
    grid-template-columns: 1fr;
  }

  .feature-card {
    min-height: 150px;
  }

  .section-copy h2,
  .contact-copy h2 {
    font-size: 34px;
  }

  .section-copy p,
  .contact-copy p {
    font-size: 16px;
  }

  .product-preview {
    width: 360px;
    max-width: 100%;
    min-height: 245px;
    transform: scale(0.7);
    transform-origin: center;
    margin: -36px auto;
  }

  .contact-list a {
    align-items: flex-start;
    text-align: left;
  }

  .contact-dock {
    right: 14px;
    bottom: 18px;
    gap: 10px;
  }

  .dock-btn {
    width: 42px;
    height: 42px;
  }

  .dock-btn::before {
    display: none;
  }
}