:root {
  color-scheme: light;
  --ink: #102026;
  --muted: #63717a;
  --line: #d9e2e5;
  --paper: #f6f8f7;
  --white: #ffffff;
  --teal: #057b83;
  --teal-dark: #05515c;
  --green: #4d8f31;
  --amber: #b9852f;
  --steel: #26353f;
  --shadow: 0 20px 60px rgba(16, 32, 38, 0.14);
  font-family: "Inter", "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  letter-spacing: 0;
}

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

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

button,
input,
select,
textarea {
  font: inherit;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 4vw, 56px);
  background: rgba(246, 248, 247, 0.78);
  border-bottom: 1px solid rgba(217, 226, 229, 0.7);
  backdrop-filter: blur(18px);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 12px 36px rgba(16, 32, 38, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(5, 123, 131, 0.32);
  background: linear-gradient(135deg, #0d727b, #102026);
  color: #fff;
  font-weight: 800;
  border-radius: 8px;
}

.brand-text {
  display: grid;
  gap: 2px;
}

.brand-text strong {
  font-size: 16px;
  line-height: 1.1;
}

.brand-text small {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 10px 14px;
  color: #33464f;
  font-size: 14px;
  border-radius: 8px;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: rgba(5, 123, 131, 0.09);
  color: var(--teal-dark);
}

.site-nav .nav-cta {
  color: #fff;
  background: var(--ink);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 8px;
}

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

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  padding: 150px clamp(18px, 5vw, 72px) 54px;
  overflow: hidden;
  isolation: isolate;
}

.hero-media,
.hero-media img,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media {
  z-index: -2;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(7, 20, 25, 0.88) 0%, rgba(7, 20, 25, 0.66) 36%, rgba(7, 20, 25, 0.15) 72%),
    linear-gradient(0deg, rgba(246, 248, 247, 0.18), transparent 34%);
}

.hero-content {
  width: min(760px, 100%);
  color: #fff;
}

.eyebrow,
.section-kicker,
.product-label {
  margin: 0 0 14px;
  color: #9bd6d2;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 700px;
  margin: 0;
  font-size: clamp(48px, 7vw, 88px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 680px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.8;
}

.hero-actions,
.product-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--teal);
  color: #fff;
}

.button-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.08);
}

.button-soft {
  color: var(--teal-dark);
  background: #e8f3f1;
  border-color: #c7dedc;
}

.hero-panel {
  position: absolute;
  right: clamp(18px, 5vw, 72px);
  bottom: 48px;
  display: grid;
  grid-template-columns: repeat(3, minmax(96px, 1fr));
  gap: 1px;
  max-width: 520px;
  width: min(44vw, 520px);
  background: rgba(255, 255, 255, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-panel div {
  display: grid;
  gap: 6px;
  min-height: 104px;
  padding: 18px;
  background: rgba(8, 26, 31, 0.5);
  color: rgba(255, 255, 255, 0.76);
}

.metric {
  color: #fff;
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 900;
}

.section {
  padding: 96px clamp(18px, 5vw, 72px);
}

.intro-band {
  background: var(--white);
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(280px, 1.2fr);
  gap: clamp(24px, 6vw, 84px);
  align-items: start;
}

h2 {
  margin: 0;
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1.12;
  letter-spacing: 0;
}

.intro-grid p,
.section-heading p,
.product-copy p,
.contact-copy p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: end;
  margin-bottom: 36px;
}

.section-heading p {
  max-width: 560px;
}

.products-section {
  background: #eef3f2;
}

.product-shell {
  display: grid;
  gap: 18px;
}

.product-tabs {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.product-tab {
  min-height: 66px;
  padding: 0 14px;
  border: 1px solid var(--line);
  background: var(--white);
  color: #34464e;
  border-radius: 8px;
  font-weight: 800;
  cursor: pointer;
}

.product-tab.active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.product-stage {
  display: grid;
  grid-template-columns: minmax(280px, 0.95fr) minmax(320px, 1.05fr);
  gap: 36px;
  min-height: 500px;
  padding: clamp(24px, 4vw, 44px);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.product-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.product-copy h3 {
  margin: 0 0 18px;
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.06;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.spec-grid div {
  min-height: 86px;
  padding: 12px 0 12px 16px;
  border-left: 3px solid #c7dedc;
  border-radius: 0;
}

.spec-grid strong {
  display: block;
  color: var(--ink);
  font-size: 20px;
  margin-bottom: 6px;
}

.spec-grid span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.product-visual {
  display: grid;
  place-items: center;
  min-height: 420px;
}

.visual-plate {
  position: relative;
  width: min(100%, 560px);
  aspect-ratio: 1.15;
  overflow: hidden;
  border-radius: 8px;
  background:
    linear-gradient(140deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.18)),
    var(--plate, linear-gradient(135deg, #17343b, #057b83));
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.visual-plate::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("assets/hero-drone-lab.png");
  background-size: cover;
  background-position: 64% 46%;
  opacity: 0.28;
  mix-blend-mode: luminosity;
}

.visual-plate::after {
  content: "";
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 8px;
}

.visual-tag {
  position: absolute;
  left: 28px;
  top: 28px;
  z-index: 2;
  color: rgba(255, 255, 255, 0.92);
  font-size: clamp(42px, 8vw, 92px);
  font-weight: 900;
  line-height: 1;
}

.drone-line,
.drone-core,
.rotor {
  position: absolute;
  z-index: 3;
  display: block;
  background: rgba(255, 255, 255, 0.92);
}

.drone-line {
  left: 50%;
  top: 56%;
  width: 54%;
  height: 4px;
  transform-origin: center;
}

.line-a {
  transform: translate(-50%, -50%) rotate(20deg);
}

.line-b {
  transform: translate(-50%, -50%) rotate(-20deg);
}

.drone-core {
  left: 50%;
  top: 56%;
  width: 86px;
  height: 52px;
  border-radius: 8px;
  transform: translate(-50%, -50%);
  box-shadow: 0 18px 38px rgba(0, 0, 0, 0.24);
}

.rotor {
  width: 82px;
  height: 82px;
  border: 4px solid rgba(255, 255, 255, 0.94);
  background: rgba(10, 31, 38, 0.2);
  border-radius: 50%;
}

.rotor-a {
  left: 18%;
  top: 38%;
}

.rotor-b {
  right: 18%;
  top: 38%;
}

.rotor-c {
  left: 22%;
  bottom: 18%;
}

.rotor-d {
  right: 22%;
  bottom: 18%;
}

.solutions-section {
  background: var(--white);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.solution-grid article {
  min-height: 250px;
  padding: 28px;
  background: var(--white);
}

.solution-grid span {
  color: var(--teal);
  font-weight: 900;
}

.solution-grid h3,
.case-list h3 {
  margin: 54px 0 12px;
  font-size: 26px;
}

.solution-grid p,
.case-list p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.service-band {
  padding: 86px clamp(18px, 5vw, 72px);
  background: var(--steel);
  color: #fff;
}

.service-inner {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(320px, 1.2fr);
  gap: 38px;
  align-items: center;
}

.service-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.service-flow div {
  min-height: 150px;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.service-flow strong {
  color: #9bd6d2;
  font-size: 32px;
}

.service-flow span {
  font-size: 18px;
  font-weight: 800;
}

.cases-section {
  background: #f7f4ee;
}

.case-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.case-list article {
  min-height: 300px;
  padding: 28px;
  border: 1px solid #e2d8c8;
  border-radius: 8px;
  background: #fffdfa;
}

.case-meta {
  color: var(--amber);
  font-size: 13px;
  font-weight: 900;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(320px, 1fr);
  gap: clamp(28px, 6vw, 72px);
  padding: 96px clamp(18px, 5vw, 72px);
  background: var(--ink);
  color: #fff;
}

.contact-copy {
  align-self: center;
}

.contact-copy p {
  max-width: 620px;
  margin-top: 24px;
  color: rgba(255, 255, 255, 0.75);
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: clamp(18px, 3vw, 30px);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
}

.contact-form label {
  display: grid;
  gap: 8px;
}

.contact-form span {
  color: rgba(255, 255, 255, 0.76);
  font-size: 13px;
  font-weight: 800;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
}

.contact-form textarea {
  resize: vertical;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(18px, 5vw, 72px);
  background: #081318;
  color: rgba(255, 255, 255, 0.74);
}

.site-footer div {
  display: grid;
  gap: 4px;
}

.site-footer strong {
  color: #fff;
}

@media (max-width: 1040px) {
  .hero {
    min-height: 980px;
  }

  .hero-panel {
    position: static;
    width: 100%;
    margin-top: 36px;
  }

  .product-tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .product-stage,
  .service-inner,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .product-visual {
    min-height: 360px;
  }

  .solution-grid,
  .case-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .site-header {
    padding: 14px 18px;
  }

  .brand {
    min-width: 0;
  }

  .brand-text small {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 18px;
    right: 18px;
    top: 70px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

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

  .site-nav a {
    width: 100%;
  }

  .hero {
    min-height: 920px;
    padding: 126px 18px 34px;
  }

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

  .hero-overlay {
    background:
      linear-gradient(180deg, rgba(7, 20, 25, 0.94) 0%, rgba(7, 20, 25, 0.74) 48%, rgba(7, 20, 25, 0.42) 100%);
  }

  .hero-panel {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 72px 18px;
  }

  .intro-grid,
  .section-heading {
    display: grid;
    grid-template-columns: 1fr;
  }

  .product-tabs,
  .spec-grid,
  .solution-grid,
  .case-list,
  .service-flow {
    grid-template-columns: 1fr;
  }

  .product-stage {
    padding: 18px;
  }

  .visual-plate {
    aspect-ratio: 0.95;
  }

  .rotor {
    width: 62px;
    height: 62px;
  }

  .contact-section {
    padding: 72px 18px;
  }

  .site-footer {
    display: grid;
  }
}