:root {
  --ink: #f5f9ff;
  --muted: #9eb2ca;
  --line: rgba(125, 169, 213, 0.18);
  --panel: rgba(7, 22, 40, 0.86);
  --panel-soft: rgba(11, 32, 57, 0.72);
  --cyan: #19c7f3;
  --blue: #1062e5;
  --navy: #06111f;
  --deep: #030913;
  --white: #ffffff;
  --radius: 8px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: #f3f7fc;
  line-height: 1.6;
  overflow-x: hidden;
}

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

img {
  display: block;
  max-width: 100%;
}

.container {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  z-index: 50;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  background: rgba(4, 13, 26, 0.82);
  border-bottom: 1px solid rgba(125, 169, 213, 0.14);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 176px;
}

.brand img {
  width: 168px;
  height: auto;
  object-fit: contain;
}

.site-nav {
  display: flex;
  gap: 30px;
  align-items: center;
  font-size: 14px;
  color: #dce9f7;
}

.site-nav a {
  position: relative;
  padding: 8px 0;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--cyan);
  transition: transform 0.2s ease;
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(8, 25, 44, 0.9);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.hero {
  min-height: 100vh;
  padding: 0;
  position: relative;
  display: grid;
  place-items: center;
  isolation: isolate;
  overflow: hidden;
  background: #06111f;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -5%;
  z-index: -2;
  background: url("assets/bg-home-clean.png") 54% top / cover no-repeat;
  transform: translate3d(0.8%, 0.2%, 0) scale(1.04);
  transform-origin: 78% 22%;
  will-change: transform;
  animation: drone-flight-view 16s ease-in-out infinite alternate;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 50% 46%, rgba(4, 13, 26, 0.02), rgba(4, 13, 26, 0.2) 52%, rgba(4, 13, 26, 0.46) 100%),
    linear-gradient(180deg, rgba(4, 13, 26, 0.18), rgba(4, 13, 26, 0.02) 32%, rgba(4, 13, 26, 0.28));
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(1180px, calc(100% - 48px));
  padding-top: 54px;
  text-align: center;
  color: #fff;
  text-shadow: 0 8px 30px rgba(2, 10, 22, 0.36);
}

.hero-copy h1 {
  margin: 0 0 24px;
  font-size: clamp(54px, 6.2vw, 96px);
  line-height: 1.05;
  font-weight: 900;
  white-space: nowrap;
}

.hero-copy p {
  margin: 0;
  color: rgba(255, 255, 255, 0.94);
  font-size: clamp(22px, 2.2vw, 36px);
  font-weight: 700;
  line-height: 1.35;
}

@keyframes drone-flight-view {
  0% {
    transform: translate3d(1.2%, 0.2%, 0) scale(1.04);
  }

  45% {
    transform: translate3d(-1.2%, -0.8%, 0) scale(1.08);
  }

  100% {
    transform: translate3d(-3.8%, -1.4%, 0) scale(1.12);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero::before,
  .page-view.active-page {
    animation: none;
  }
}

.contact-info-panel > p {
  color: #5f7187;
}

.hero-inner {
  min-height: 490px;
  display: flex;
  align-items: center;
}

.hero-content {
  max-width: 980px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(42px, 4.35vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
  white-space: nowrap;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(32px, 3.8vw, 52px);
  line-height: 1.14;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.hero-intro-panel,
.section-heading p,
.contact-info-panel > p {
  color: var(--muted);
  font-size: 17px;
}

.hero-intro-panel {
  max-width: 820px;
  margin-bottom: 26px;
  padding: 22px 24px;
  border: 1px solid rgba(125, 169, 213, 0.18);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(5, 18, 34, 0.68), rgba(8, 30, 52, 0.34));
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(8px);
}

.hero-intro-panel p {
  margin-bottom: 12px;
  color: #c5d4e5;
  font-size: 16px;
  line-height: 1.85;
}

.hero-intro-panel p:last-of-type {
  margin-bottom: 0;
}

.hero-capabilities {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.hero-capabilities span {
  padding: 7px 10px;
  border: 1px solid rgba(25, 199, 243, 0.22);
  border-radius: 999px;
  background: rgba(14, 48, 82, 0.62);
  color: #dff8ff;
  font-size: 13px;
}

.hero-actions,
.bottom-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 700;
  cursor: pointer;
}

.btn.primary {
  color: #fff;
  background: linear-gradient(135deg, #1769ff, #17c8ee);
  box-shadow: 0 14px 34px rgba(23, 105, 255, 0.28);
}

.btn.ghost {
  color: #eaf6ff;
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.2);
}

.bottom-strip span,
.process-line span {
  border: 1px solid rgba(25, 199, 243, 0.2);
  background: rgba(14, 48, 82, 0.66);
  color: #dff8ff;
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 13px;
}

.section {
  position: relative;
  min-height: 100vh;
  padding: 128px 0 30px;
  background: #f2f6fb;
  color: #0c1b2f;
  overflow: visible;
}

.page-view {
  display: none;
}

.page-view.active-page {
  display: block;
  animation: page-in 0.42s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero.page-view.active-page {
  display: grid;
}

.section.page-view.active-page {
  display: flex;
  flex-direction: column;
}

body.nav-forward .page-view.active-page {
  animation-name: page-in-forward;
}

body.nav-backward .page-view.active-page {
  animation-name: page-in-backward;
}

body.nav-tapping .page-view.active-page {
  animation-name: page-in;
}

@keyframes page-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes page-in-forward {
  from {
    opacity: 0;
    transform: translateX(34px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes page-in-backward {
  from {
    opacity: 0;
    transform: translateX(-34px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.page-footer {
  width: min(var(--max), calc(100% - 48px));
  margin: 46px auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 26px;
  color: #6b7280;
  font-size: 16px;
  line-height: 1;
  white-space: nowrap;
}

.page-footer a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: inherit;
}

.page-footer img {
  width: 22px;
  height: 22px;
  object-fit: contain;
}

.hero-footer {
  position: absolute;
  left: 50%;
  bottom: 26px;
  z-index: 2;
  margin: 0;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.74);
}

.section-dark {
  color: #0c1b2f;
  background: #eef5fc;
}

.home-summary {
  background: #f4f8fd;
  margin-top: -1px;
}

.home-summary .page-footer,
.advantages .page-footer {
  margin-top: 40px;
}

.ai-section .page-footer {
  margin-top: 42px;
}

.contact .page-footer {
  margin-top: 36px;
}

.case-heading {
  max-width: 920px;
  margin-bottom: 18px;
}

.case-heading p {
  color: #5f7187;
}

.case-capabilities {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.case-capabilities span {
  padding: 8px 12px;
  border: 1px solid rgba(16, 98, 229, 0.16);
  border-radius: 999px;
  background: rgba(25, 199, 243, 0.08);
  color: #17456f;
  font-size: 13px;
  font-weight: 700;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-dark .section-heading p,
.section-dark .image-card p,
.section-dark .advantage-grid p {
  color: #5f7187;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.image-card {
  overflow: hidden;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid rgba(24, 61, 100, 0.08);
  box-shadow: 0 18px 48px rgba(15, 39, 70, 0.12);
}

.section-dark .image-card {
  background: #fff;
  border-color: rgba(24, 61, 100, 0.1);
  box-shadow: 0 18px 48px rgba(15, 39, 70, 0.12);
}

.image-card img {
  width: 100%;
  height: 176px;
  object-fit: cover;
}

.image-card.large img {
  height: 250px;
}

.image-card div {
  padding: 22px;
}

.image-card span,
.feature-body span,
.advantage-grid span {
  display: inline-flex;
  margin-bottom: 10px;
  color: var(--cyan);
  font-weight: 800;
}

.image-card p,
.feature-card p,
.advantage-grid p,
.contact-list p {
  color: #5f7187;
  margin-bottom: 0;
}

.home-card-grid {
  gap: 22px;
}

.home-card {
  position: relative;
  border-radius: 12px;
  border-color: rgba(24, 61, 100, 0.14);
  box-shadow: 0 14px 32px rgba(15, 39, 70, 0.08);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.home-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 46px rgba(15, 39, 70, 0.14);
}

.home-card > img:first-child {
  height: 188px;
  object-position: center center;
}

.home-card .home-card-icon {
  position: absolute;
  left: 28px;
  top: 150px;
  z-index: 2;
  width: 68px;
  height: 68px;
  border-radius: 50%;
  border: 3px solid #fff;
  box-shadow: 0 8px 20px rgba(8, 36, 69, 0.2);
}

.home-card div {
  position: relative;
  min-height: 188px;
  padding: 56px 72px 30px 28px;
}

.home-card h3 {
  color: #0e1c2f;
  font-size: 22px;
  line-height: 1.25;
  margin-bottom: 10px;
  white-space: nowrap;
}

.home-card p {
  color: #5f7187;
  font-size: 14px;
  line-height: 1.72;
  margin: 0;
}

.home-card .home-card-arrow {
  position: absolute;
  right: 26px;
  bottom: 34px;
  display: block;
  margin: 0;
  color: #75c7ff;
  font-size: 38px;
  line-height: 1;
  font-weight: 300;
}

.bottom-strip {
  justify-content: space-between;
  margin-top: 26px;
  padding: 16px;
  border: 1px solid rgba(125, 169, 213, 0.16);
  border-radius: var(--radius);
  background: rgba(7, 22, 40, 0.72);
}

.ai-section {
  color: #0c1b2f;
  background: #f4f8fd;
}

.ai-section .section-heading {
  max-width: 1080px;
}

.ai-section .section-heading p {
  color: #5f7187;
  white-space: nowrap;
}

.process-line {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 8px 0 28px;
}

.process-line span {
  color: #17456f;
  background: #fff;
  border-color: rgba(16, 98, 229, 0.12);
  box-shadow: 0 12px 26px rgba(15, 39, 70, 0.08);
}

.process-line i {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(25, 199, 243, 0.12), rgba(25, 199, 243, 0.56));
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.feature-card {
  overflow: hidden;
  border-radius: 12px;
  background: #fff;
  border: 1px solid rgba(24, 61, 100, 0.1);
  box-shadow: 0 18px 48px rgba(15, 39, 70, 0.12);
}

.feature-card img {
  width: 100%;
  height: 170px;
  object-fit: cover;
}

.feature-body {
  padding: 22px;
}

.feature-card h3 {
  color: #0e1c2f;
}

.feature-card p {
  color: #5f7187;
}

.advantages {
  background: #f4f8fd;
}

.advantages-layout {
  display: block;
}

.advantage-visual {
  display: none;
}

.advantage-visual img {
  width: 100%;
  height: 100%;
  min-height: 520px;
  object-fit: cover;
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.advantage-grid article {
  padding: 22px 24px;
  border: 1px solid rgba(24, 61, 100, 0.1);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 14px 34px rgba(15, 39, 70, 0.08);
}

.advantages .section-heading {
  max-width: 1080px;
}

.advantages .section-heading p {
  white-space: nowrap;
}

.advantage-grid h3 {
  display: inline-block;
  margin: 0 0 0 10px;
  font-size: 19px;
  vertical-align: middle;
}

.advantage-grid p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.6;
  white-space: nowrap;
}

.contact {
  color: #0c1b2f;
  background:
    linear-gradient(90deg, rgba(246, 250, 255, 0.92), rgba(246, 250, 255, 0.76) 52%, rgba(246, 250, 255, 0.92)),
    linear-gradient(180deg, rgba(246, 250, 255, 0.86), rgba(238, 245, 252, 0.96)),
    url("assets/bg-contact-hero.jpg") center / cover no-repeat;
}

.contact-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 34px;
  align-items: stretch;
}

.contact-info-panel,
.contact-form {
  border: 1px solid rgba(24, 61, 100, 0.1);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 20px 54px rgba(15, 39, 70, 0.12);
  backdrop-filter: blur(16px);
}

.contact-info-panel {
  padding: 32px;
}

.contact-list {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.contact-list p {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 12px;
  align-items: start;
  padding: 12px 14px;
  border: 1px solid rgba(24, 61, 100, 0.08);
  border-radius: 8px;
  background: rgba(241, 247, 253, 0.72);
  margin: 0;
}

.contact-list span {
  display: inline-block;
  min-width: 0;
  color: #0e1c2f;
  font-weight: 700;
}

.contact-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  padding: 30px;
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: #0e1c2f;
  font-size: 14px;
  font-weight: 700;
}

.contact-form .full {
  grid-column: 1 / -1;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid rgba(24, 61, 100, 0.12);
  border-radius: var(--radius);
  padding: 13px 14px;
  color: #0e1c2f;
  background: rgba(255, 255, 255, 0.86);
  font: inherit;
  outline: none;
}

textarea {
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(25, 199, 243, 0.12);
}

@media (max-width: 980px) {
  .site-header {
    height: 66px;
    padding: 0 20px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 66px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(4, 13, 26, 0.96);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 13px 12px;
  }

  .hero {
    min-height: 760px;
    padding-top: 66px;
    background-position: center top;
  }

  .hero-copy {
    padding-top: 0;
  }

  .hero-copy h1 {
    white-space: normal;
  }

  .scenario-grid,
  .feature-grid,
  .advantages-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

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

  .home-card > img:first-child {
    height: 210px;
  }

  .home-card .home-card-icon {
    top: 172px;
  }

  .home-card div {
    min-height: auto;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 32px, var(--max));
  }

  h1 {
    font-size: 40px;
  }

  .hero {
    min-height: 620px;
  }

  .hero-copy h1 {
    font-size: 42px;
  }

  .hero-copy p {
    font-size: 20px;
  }

  h2 {
    font-size: 32px;
  }

  .section {
    min-height: 100vh;
    height: auto;
    padding: 112px 0 28px;
    overflow: visible;
  }

  .hero-actions,
  .page-footer {
    flex-direction: column;
    gap: 10px;
    align-items: center;
    white-space: normal;
    text-align: center;
  }

  .btn {
    width: 100%;
  }

  .process-line {
    flex-wrap: wrap;
  }

  .process-line i {
    display: none;
  }

  .contact-form {
    grid-template-columns: 1fr;
  }

  .ai-section .section-heading p {
    white-space: normal;
  }

  .advantages .section-heading p,
  .advantage-grid p {
    white-space: normal;
  }

  .home-card > img:first-child {
    height: 178px;
  }

  .home-card .home-card-icon {
    left: 22px;
    top: 140px;
    width: 62px;
    height: 62px;
  }

  .home-card div {
    padding: 52px 54px 26px 22px;
  }

  .home-card h3 {
    font-size: 21px;
  }

  .home-card .home-card-arrow {
    right: 20px;
    bottom: 30px;
  }
}