:root {
  --bg: #071018;
  --panel: rgba(9, 24, 34, 0.72);
  --panel-strong: rgba(14, 36, 49, 0.92);
  --line: rgba(116, 231, 255, 0.24);
  --text: #eef9ff;
  --muted: #9bb7c6;
  --cyan: #39e7ff;
  --green: #68ffb6;
  --amber: #ffc760;
  --red: #ff6f8f;
  --radius: 8px;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 14%, rgba(57, 231, 255, 0.16), transparent 28%),
    radial-gradient(circle at 82% 18%, rgba(104, 255, 182, 0.11), transparent 26%),
    linear-gradient(135deg, #061019 0%, #0b1820 45%, #080d13 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(57, 231, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 231, 255, 0.06) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: linear-gradient(to bottom, black, transparent 84%);
}

.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.22;
  background: repeating-linear-gradient(0deg, rgba(255,255,255,0.03), rgba(255,255,255,0.03) 1px, transparent 1px, transparent 4px);
  mix-blend-mode: screen;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(57, 231, 255, 0.35);
  background: rgba(245, 250, 252, 0.9);
  box-shadow: 0 10px 34px rgba(5, 13, 20, 0.18);
  backdrop-filter: blur(18px);
}

.brand,
.nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  flex: 0 1 auto;
  min-width: 0;
}

.brand-logo {
  display: block;
  width: min(430px, 48vw);
  max-height: 54px;
  object-fit: contain;
  filter: drop-shadow(0 4px 14px rgba(5, 13, 20, 0.12));
}

.nav a {
  color: #183041;
  font-size: 14px;
  font-weight: 700;
}

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

main {
  position: relative;
  z-index: 1;
}

.section,
.hero {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  min-height: calc(100vh - 72px);
  padding: 68px 0 42px;
  align-items: center;
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.98fr);
  gap: clamp(34px, 5vw, 72px);
}

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

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

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(42px, 7vw, 82px);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 4.5vw, 52px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  font-size: 24px;
  line-height: 1.18;
}

.lead,
.intro-band p,
.model-content p,
.command-copy p,
.qr-copy p,
.mission-card p {
  color: var(--muted);
  line-height: 1.8;
}

.lead {
  max-width: 720px;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 32px 0;
}

.primary-btn,
.ghost-btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border-radius: 4px;
  font-weight: 800;
  white-space: nowrap;
}

.primary-btn {
  color: #021019;
  background: linear-gradient(90deg, var(--cyan), var(--green));
  box-shadow: 0 0 26px rgba(57, 231, 255, 0.22);
}

.ghost-btn {
  border: 1px solid var(--line);
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 680px;
}

.metric-strip div,
.scan-panel,
.model-card,
.mission-card,
.qr-card,
.telemetry-card {
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(10, 27, 39, 0.82), rgba(6, 16, 24, 0.58));
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.26), inset 0 1px 0 rgba(255,255,255,0.08);
}

.metric-strip div {
  padding: 16px;
  border-radius: var(--radius);
}

.metric-strip strong {
  display: block;
  color: var(--cyan);
  font-size: 28px;
  line-height: 1;
}

.metric-strip span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.hero-visual {
  position: relative;
  min-height: 520px;
  border: 1px solid rgba(116, 231, 255, 0.18);
  border-radius: 8px;
  overflow: hidden;
  background:
    radial-gradient(circle at center, rgba(57, 231, 255, 0.16), transparent 36%),
    linear-gradient(155deg, rgba(9, 26, 38, 0.86), rgba(6, 13, 20, 0.9));
}

.hero-visual::before,
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(57, 231, 255, 0.16);
  clip-path: polygon(0 0, 38% 0, 38% 1px, 1px 1px, 1px 36%, 0 36%, 0 0, 100% 64%, 100% 100%, 64% 100%, 64% calc(100% - 1px), calc(100% - 1px) calc(100% - 1px), calc(100% - 1px) 64%);
}

.orbit {
  position: absolute;
  inset: 72px;
  border: 1px dashed rgba(104, 255, 182, 0.28);
  border-radius: 50%;
  animation: rotate 18s linear infinite;
}

.orbit-two {
  inset: 124px 86px;
  border-color: rgba(57, 231, 255, 0.26);
  animation-duration: 12s;
  animation-direction: reverse;
}

.flight-grid {
  position: absolute;
  inset: auto -20% -70px;
  height: 190px;
  transform: perspective(400px) rotateX(64deg);
  background-image:
    linear-gradient(rgba(57,231,255,0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57,231,255,0.22) 1px, transparent 1px);
  background-size: 40px 40px;
}

.drone-core {
  position: absolute;
  inset: 50%;
  width: 320px;
  height: 168px;
  transform: translate(-50%, -50%);
  filter: drop-shadow(0 0 34px rgba(57, 231, 255, 0.46));
}

.body-line {
  position: absolute;
  left: 34px;
  right: 34px;
  top: 78px;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, #eafcff, transparent);
}

.payload {
  position: absolute;
  left: 119px;
  top: 54px;
  width: 82px;
  height: 54px;
  border: 1px solid var(--cyan);
  background: rgba(57, 231, 255, 0.14);
  clip-path: polygon(16% 0, 84% 0, 100% 50%, 84% 100%, 16% 100%, 0 50%);
}

.rotor {
  position: absolute;
  width: 94px;
  height: 94px;
  border: 1px solid rgba(57, 231, 255, 0.5);
  border-radius: 50%;
}

.rotor::before,
.rotor::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  top: 45px;
  height: 2px;
  background: rgba(238, 249, 255, 0.9);
  animation: blade 0.7s linear infinite;
}

.rotor::after {
  transform: rotate(90deg);
}

.rotor-a { left: 0; top: 0; }
.rotor-b { right: 0; top: 0; }
.rotor-c { left: 0; bottom: 0; }
.rotor-d { right: 0; bottom: 0; }

.scan-panel {
  position: absolute;
  width: 138px;
  padding: 12px;
  border-radius: 4px;
  font-size: 11px;
  color: var(--muted);
}

.scan-panel b {
  display: block;
  margin-top: 4px;
  color: var(--green);
  font-size: 18px;
}

.panel-a { left: 28px; top: 34px; }
.panel-b { right: 32px; bottom: 44px; }

.section {
  padding: 74px 0;
}

.intro-band,
.command-section,
.qr-section {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
}

.intro-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-title {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 28px;
}

.fleet-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.model-card {
  border-radius: var(--radius);
  overflow: hidden;
}

.model-media,
.model-photo {
  width: 100%;
  height: 310px;
  object-fit: cover;
  display: block;
  background: #0a1821;
}

.model-photo {
  filter: saturate(0.95) contrast(1.08);
}

.g1-photo {
  object-fit: contain;
  padding: 18px;
  background:
    radial-gradient(circle at 50% 45%, rgba(57, 231, 255, 0.14), transparent 38%),
    linear-gradient(145deg, #eef3f5, #cfd8dc);
}

.g1-visual {
  position: relative;
  display: block;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 48%, rgba(57, 231, 255, 0.2), transparent 38%),
    linear-gradient(145deg, rgba(12, 33, 46, 0.92), rgba(5, 12, 18, 0.96));
}

.g1-visual::before {
  content: "G1 HEAVY LIFT";
  position: absolute;
  left: 22px;
  top: 20px;
  color: rgba(104, 255, 182, 0.86);
  font-size: 12px;
  font-weight: 800;
}

.heli-blade,
.heli-body,
.heli-tail,
.cargo-box {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.heli-blade {
  top: 78px;
  width: min(78%, 430px);
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, #eafcff 20%, #39e7ff 50%, #eafcff 80%, transparent);
  box-shadow: 0 0 22px rgba(57, 231, 255, 0.48);
}

.heli-body {
  top: 122px;
  width: 210px;
  height: 62px;
  border: 1px solid rgba(57, 231, 255, 0.72);
  background: linear-gradient(90deg, rgba(238,249,255,0.9), rgba(57,231,255,0.3));
  clip-path: polygon(0 50%, 20% 10%, 76% 8%, 100% 50%, 76% 92%, 18% 86%);
}

.heli-tail {
  top: 148px;
  width: 420px;
  height: 3px;
  background: linear-gradient(90deg, transparent 0 18%, rgba(238,249,255,0.9) 18% 100%);
}

.cargo-box {
  top: 196px;
  width: 82px;
  height: 54px;
  border: 1px solid var(--amber);
  background: rgba(255, 199, 96, 0.15);
  box-shadow: 0 0 22px rgba(255, 199, 96, 0.18);
}

.model-content {
  padding: 24px;
}

.model-kicker {
  margin-bottom: 8px;
  color: var(--green) !important;
  font-size: 13px;
  font-weight: 800;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 20px;
}

.spec-grid span {
  min-height: 58px;
  padding: 12px;
  border: 1px solid rgba(116, 231, 255, 0.16);
  border-radius: 6px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.035);
  font-size: 13px;
}

.spec-grid b {
  display: block;
  margin-bottom: 5px;
  color: var(--text);
  font-size: 22px;
}

.mission-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.mission-card {
  min-height: 260px;
  padding: 22px;
  border-radius: var(--radius);
}

.mission-card span {
  display: block;
  margin-bottom: 44px;
  color: var(--cyan);
  font-weight: 900;
}

.command-section {
  align-items: stretch;
}

.check-list {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 24px 0 0;
  list-style: none;
}

.check-list li {
  padding: 14px 16px;
  border-left: 3px solid var(--green);
  background: rgba(104, 255, 182, 0.08);
  color: #dff8f0;
}

.command-visual {
  position: relative;
  min-height: 420px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #091722;
}

.command-visual img {
  width: 100%;
  height: 100%;
  min-height: 420px;
  object-fit: cover;
  opacity: 0.88;
}

.command-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(4, 12, 18, 0.82));
}

.telemetry-card {
  position: absolute;
  left: 22px;
  bottom: 22px;
  z-index: 2;
  width: min(300px, calc(100% - 44px));
  padding: 18px;
  border-radius: 6px;
}

.telemetry-card span,
.telemetry-card small {
  color: var(--muted);
}

.telemetry-card strong {
  display: block;
  margin: 4px 0 8px;
  color: var(--green);
  font-size: 34px;
}

.qr-section {
  margin-bottom: 56px;
  padding: 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(57, 231, 255, 0.12), transparent 42%),
    rgba(7, 18, 27, 0.78);
}

.contact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.contact-line span {
  padding: 9px 12px;
  border: 1px solid rgba(104, 255, 182, 0.24);
  border-radius: 999px;
  color: #ccffee;
  background: rgba(104, 255, 182, 0.08);
}

.qr-card {
  justify-self: end;
  width: min(280px, 100%);
  padding: 18px;
  border-radius: var(--radius);
  text-align: center;
}

.qr-card img {
  width: 100%;
  border-radius: 6px;
  background: white;
}

.qr-card p {
  margin: 12px 0 0;
  color: var(--cyan);
  font-weight: 800;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 24px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
}

@keyframes rotate {
  to { transform: rotate(360deg); }
}

@keyframes blade {
  to { transform: rotate(360deg); }
}

@media (max-width: 980px) {
  .section-grid,
  .intro-band,
  .command-section,
  .qr-section,
  .fleet-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 54px;
  }

  .hero-visual {
    min-height: 430px;
  }

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

  .qr-card {
    justify-self: start;
  }
}

@media (max-width: 680px) {
  .topbar {
    position: relative;
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 20px;
  }

  .brand-logo {
    width: min(100%, 340px);
    max-height: 44px;
  }
  .nav {
    width: 100%;
    justify-content: space-between;
    gap: 10px;
  }

  .nav a {
    font-size: 13px;
  }

  .section,
  .hero {
    width: min(100% - 28px, 1180px);
  }

  h1 {
    font-size: clamp(36px, 12vw, 48px);
  }

  h2 {
    font-size: 30px;
  }

  .metric-strip,
  .spec-grid,
  .mission-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions a {
    width: 100%;
  }

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

  .drone-core {
    width: 250px;
    height: 140px;
  }

  .rotor {
    width: 76px;
    height: 76px;
  }

  .rotor::before,
  .rotor::after {
    top: 37px;
  }

  .body-line {
    top: 64px;
  }

  .payload {
    left: 88px;
    top: 44px;
  }

  .scan-panel {
    width: 118px;
  }

  .model-media,
  .model-photo {
    height: 240px;
  }

  .mission-card {
    min-height: auto;
  }

  .mission-card span {
    margin-bottom: 24px;
  }

  .qr-section {
    padding: 28px 18px;
  }

  .footer {
    flex-direction: column;
  }
}