:root {
  --ink: #101820;
  --muted: #607081;
  --line: rgba(12, 28, 44, 0.12);
  --cyan: #11c7d8;
  --green: #00c889;
  --amber: #f3a33a;
  --blue: #2759c7;
  --paper: #f6f9fb;
  --white: #ffffff;
  --night: #09111e;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

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

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 72px;
  padding: 0 clamp(20px, 5vw, 72px);
  color: #fff;
  background: rgba(5, 13, 26, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(18px);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

.language-picker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 13px;
}

.language-picker select {
  min-width: 122px;
  min-height: 38px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 6px;
  padding: 0 34px 0 12px;
  color: #101820;
  background:
    linear-gradient(45deg, transparent 50%, #101820 50%) right 16px center / 6px 6px no-repeat,
    linear-gradient(135deg, #ffffff, #e9f4f5);
  outline: none;
  font: inherit;
  font-weight: 700;
  appearance: none;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.16);
}

.language-picker select:hover,
.language-picker select:focus {
  border-color: rgba(17, 199, 216, 0.72);
  box-shadow:
    0 0 0 3px rgba(17, 199, 216, 0.16),
    0 10px 28px rgba(0, 0, 0, 0.16);
}

.language-picker option {
  color: #101820;
  background: #fff;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 190px;
}

html:not([data-language-ready]) .brand {
  visibility: hidden;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(17, 199, 216, 0.65);
  border-radius: 8px;
  color: var(--cyan);
  font-weight: 800;
  background: rgba(17, 199, 216, 0.1);
}

.brand-logo {
  width: 50px;
  height: 50px;
  padding: 0;
  border-color: transparent;
  background: transparent;
  overflow: hidden;
}

.brand-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.28));
}

.brand-logo-zh {
  filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.28));
}

.brand-logo-en {
  display: none;
}

html[data-language="en"] .brand {
  min-width: 220px;
}

html[data-language="en"] .brand-logo {
  width: 205px;
  height: 46px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  overflow: visible;
}

html[data-language="en"] .brand > span:last-child {
  display: none;
}

html[data-language="en"] .brand-logo-zh {
  display: none;
}

html[data-language="en"] .brand-logo-en {
  display: block;
  filter: brightness(0) invert(1) drop-shadow(0 6px 12px rgba(0, 0, 0, 0.28));
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.1;
}

.brand small {
  margin-top: 4px;
  color: rgba(255, 255, 255, 0.64);
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 34px);
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
}

.nav a:hover {
  color: #fff;
}

.header-action,
.primary-btn,
.ghost-btn,
.contact-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 6px;
  font-weight: 700;
}

.header-action,
.primary-btn,
.contact-form button {
  color: #031018;
  background: linear-gradient(135deg, var(--cyan), #7ee6cb);
  box-shadow: 0 14px 36px rgba(17, 199, 216, 0.28);
}

.ghost-btn {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.38);
  background: rgba(255, 255, 255, 0.08);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  padding: 140px clamp(20px, 5vw, 72px) 72px;
  overflow: hidden;
  color: #fff;
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-media {
  object-fit: cover;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(5, 12, 23, 0.94) 0%, rgba(5, 12, 23, 0.68) 42%, rgba(5, 12, 23, 0.2) 100%),
    linear-gradient(0deg, rgba(5, 12, 23, 0.72), rgba(5, 12, 23, 0.08));
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(58px, 8vw, 116px);
  line-height: 0.95;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 660px;
  margin: 26px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-panel {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  width: min(780px, 100%);
  margin-top: 56px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(6, 18, 34, 0.72);
  backdrop-filter: blur(14px);
}

.hero-panel div {
  padding: 22px;
  background: rgba(255, 255, 255, 0.04);
}

.metric,
.label {
  display: block;
}

.metric {
  color: #fff;
  font-size: clamp(20px, 3vw, 32px);
  font-weight: 800;
}

.label {
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 14px;
}

.section {
  padding: clamp(64px, 9vw, 112px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 36px;
}

.section h2 {
  margin: 0;
  font-size: clamp(30px, 4.6vw, 54px);
  line-height: 1.14;
  letter-spacing: 0;
}

.intro {
  background: #fff;
}

.product-devices {
  margin-top: 42px;
  padding: 0;
}

.hardware-products {
  margin-top: 44px;
}

.hardware-heading {
  max-width: 900px;
  margin-bottom: 24px;
}

.hardware-heading h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.16;
}

.hardware-heading p:last-child {
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.8;
}

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

.hardware-grid article {
  min-height: 330px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, #ffffff, #f7fafc);
}

.hardware-grid b {
  color: var(--amber);
  font-size: 14px;
}

.hardware-grid h3 {
  margin: 16px 0 10px;
  font-size: 24px;
}

.hardware-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.hardware-grid ul {
  display: grid;
  gap: 9px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.hardware-grid li {
  position: relative;
  padding-left: 16px;
  color: #2c3a45;
  line-height: 1.55;
}

.hardware-grid li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.intro-grid article,
.timeline article,
.scene-cards article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.intro-grid article {
  min-height: 220px;
  padding: 26px;
}

.intro-grid span {
  color: var(--amber);
  font-weight: 900;
}

.intro-grid h3,
.timeline h3,
.scene-cards h3 {
  margin: 20px 0 10px;
  font-size: 22px;
}

.intro-grid p,
.timeline p,
.scene-cards p,
.platform-copy p,
.device-text p,
.contact p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.platform {
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(360px, 1.28fr);
  gap: 34px;
  align-items: center;
  color: #fff;
  background: var(--night);
}

.platform-copy p {
  color: rgba(255, 255, 255, 0.68);
}

.capability-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.capability-list span {
  padding: 9px 12px;
  border: 1px solid rgba(17, 199, 216, 0.26);
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.84);
  background: rgba(17, 199, 216, 0.08);
}

.tech-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.screen-figure {
  margin: 0;
  border: 1px solid rgba(17, 199, 216, 0.22);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.34);
}

.screen-figure img {
  width: 100%;
  aspect-ratio: 1886 / 845;
  object-fit: cover;
}

.solution {
  background: #eef4f8;
}

.solution-scenes {
  margin-top: 36px;
}

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

.timeline article {
  min-height: 250px;
  padding: 24px;
  border-top: 4px solid var(--green);
}

.timeline b {
  color: var(--blue);
  font-size: 15px;
}

.devices {
  display: grid;
  grid-template-columns: minmax(260px, 0.42fr) minmax(520px, 1fr);
  gap: 34px;
  align-items: start;
  background: #fff;
}

.device-text {
  position: sticky;
  top: 104px;
}

.device-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.device-gallery figure {
  margin: 0;
  min-height: 300px;
  border-radius: 8px;
  overflow: hidden;
  background: #dfe8ef;
  position: relative;
}

.install-card {
  isolation: isolate;
}

.install-card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(3, 11, 18, 0), rgba(3, 11, 18, 0.48));
  pointer-events: none;
}

.device-gallery .install-photo {
  width: 100%;
  height: 100%;
  min-height: inherit;
  object-fit: cover;
}

.device-gallery figcaption {
  position: absolute;
  z-index: 3;
  left: 14px;
  bottom: 14px;
  display: grid;
  gap: 4px;
  padding: 10px 12px;
  border-radius: 6px;
  color: #fff;
  background: rgba(6, 18, 34, 0.74);
  font-size: 14px;
}

.device-gallery figcaption strong {
  font-size: 18px;
}

.device-gallery figcaption span {
  color: rgba(255, 255, 255, 0.78);
}

.scenes {
  background: #f7f2ea;
}

.scene-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.8fr) minmax(320px, 1fr);
  gap: 28px;
  align-items: center;
}

.scene-layout > img {
  width: 100%;
  max-height: 720px;
  object-fit: cover;
  border-radius: 8px;
}

.scene-cards {
  display: grid;
  gap: 16px;
}

.scene-cards article {
  padding: 28px;
}

.news {
  background: #fff;
}

.news-heading {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.news-heading > div {
  max-width: 760px;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.news-grid article {
  min-height: 260px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, #fff, #f7fafc);
}

.news-grid time {
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
}

.news-grid h3 {
  margin: 22px 0 12px;
  font-size: 22px;
  line-height: 1.35;
}

.news-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.news-grid a {
  color: inherit;
}

.section-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--blue);
  font-weight: 800;
  background: #fff;
}

.section-link-primary {
  min-width: 150px;
  color: #031018;
  border-color: transparent;
  background: linear-gradient(135deg, var(--cyan), #7ee6cb);
  box-shadow: 0 14px 34px rgba(17, 199, 216, 0.22);
}

.contact {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(320px, 0.65fr);
  gap: 40px;
  color: #fff;
  background:
    linear-gradient(120deg, rgba(9, 17, 30, 0.96), rgba(17, 43, 64, 0.92)),
    url("/site-hero.jpg") center / cover;
}

.contact p {
  color: rgba(255, 255, 255, 0.72);
  max-width: 680px;
}

.contact-points {
  display: grid;
  gap: 10px;
  margin-top: 26px;
  color: rgba(255, 255, 255, 0.78);
}

.contact-points span {
  width: fit-content;
  max-width: 100%;
  padding: 10px 12px;
  border: 1px solid rgba(17, 199, 216, 0.2);
  border-radius: 6px;
  background: rgba(17, 199, 216, 0.08);
}

.about-copy {
  display: grid;
  gap: 18px;
  max-width: 780px;
  margin-top: 22px;
}

.about-copy h3 {
  margin: 10px 0 -4px;
  color: #fff;
  font-size: 22px;
}

.about-copy p {
  margin: 0;
}

.about-points {
  display: flex;
  flex-wrap: wrap;
}

.contact-form {
  display: grid;
  gap: 14px;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px);
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: rgba(255, 255, 255, 0.74);
  font-size: 14px;
}

.contact-form label b {
  color: #ffb3a8;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  padding: 13px 14px;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  font: inherit;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(255, 255, 255, 0.42);
}

.contact-form select {
  color-scheme: dark;
}

.contact-form button {
  border: 0;
  cursor: pointer;
  font: inherit;
}

.contact-form button:disabled {
  cursor: wait;
  opacity: 0.64;
}

.turnstile-slot:empty {
  display: none;
}

.form-status {
  min-height: 22px;
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
}

.form-status[data-state="success"] {
  color: #7ee6cb;
}

.form-status[data-state="error"] {
  color: #ffb3a8;
}

.form-status[data-state="loading"] {
  color: rgba(255, 255, 255, 0.72);
}

.lead-dialog {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: none;
  place-items: center;
  padding: 24px;
  background: rgba(5, 13, 26, 0.66);
  backdrop-filter: blur(10px);
}

.lead-dialog.is-open {
  display: grid;
}

.lead-dialog-card {
  width: min(420px, 100%);
  display: grid;
  justify-items: center;
  gap: 14px;
  padding: 32px 28px 26px;
  border: 1px solid rgba(17, 199, 216, 0.2);
  border-radius: 8px;
  color: var(--ink);
  text-align: center;
  background: #fff;
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.28);
}

.lead-dialog-icon {
  position: relative;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), #7ee6cb);
}

.lead-dialog-icon::after {
  content: "";
  width: 22px;
  height: 12px;
  border-left: 4px solid #031018;
  border-bottom: 4px solid #031018;
  transform: rotate(-45deg) translate(1px, -1px);
}

.lead-dialog-card h3 {
  margin: 4px 0 0;
  font-size: 24px;
  line-height: 1.2;
}

.lead-dialog-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.lead-dialog-card button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
  min-height: 42px;
  margin-top: 4px;
  border: 0;
  border-radius: 6px;
  color: #031018;
  background: linear-gradient(135deg, var(--cyan), #7ee6cb);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.lead-dialog-card button:focus {
  outline: 3px solid rgba(17, 199, 216, 0.28);
  outline-offset: 3px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 24px clamp(20px, 5vw, 72px);
  color: rgba(255, 255, 255, 0.72);
  background: #050b13;
}

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

.site-footer a {
  color: var(--cyan);
}

.blog-page,
.article-page {
  min-height: 100vh;
  background: #fff;
}

.blog-hero {
  min-height: 420px;
  display: grid;
  align-content: end;
  padding: 150px clamp(20px, 5vw, 72px) 70px;
  color: #fff;
  background:
    linear-gradient(120deg, rgba(5, 12, 23, 0.94), rgba(5, 12, 23, 0.52)),
    url("/site-hero.jpg") center / cover;
}

.news-hero {
  background:
    linear-gradient(120deg, rgba(5, 12, 23, 0.94), rgba(5, 12, 23, 0.56)),
    url("/low-altitude-scene.png") center / cover;
}

.blog-hero h1 {
  max-width: 880px;
  margin: 0;
  font-size: clamp(42px, 7vw, 82px);
  line-height: 1;
  letter-spacing: 0;
}

.blog-hero p:last-child {
  max-width: 780px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 18px;
  line-height: 1.8;
}

.blog-list {
  background: #fff;
}

.blog-card {
  max-width: 920px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.blog-card time,
.article-meta {
  color: var(--muted);
  font-size: 14px;
}

.blog-card h2 {
  margin: 16px 0 12px;
  font-size: clamp(26px, 4vw, 42px);
}

.blog-card p {
  margin: 0 0 20px;
  color: var(--muted);
  line-height: 1.8;
}

.text-link {
  color: var(--blue);
  font-weight: 800;
}

.article-shell {
  width: min(860px, calc(100% - 40px));
  margin: 0 auto;
  padding: 140px 0 86px;
}

.article-shell h1 {
  margin: 14px 0 14px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.12;
  letter-spacing: 0;
}

.article-shell h2 {
  margin: 42px 0 12px;
  font-size: 28px;
}

.article-shell p {
  color: #2c3a45;
  font-size: 18px;
  line-height: 1.9;
}

.article-shell .eyebrow {
  margin-top: 30px;
}

.error-page {
  min-height: 100vh;
  color: #fff;
  background:
    linear-gradient(120deg, rgba(5, 12, 23, 0.92), rgba(9, 31, 47, 0.82)),
    url("/site-hero.jpg") center / cover;
}

.error-shell {
  width: min(680px, calc(100% - 40px));
  min-height: 100vh;
  display: grid;
  align-content: center;
  gap: 24px;
  margin: 0 auto;
}

.error-brand {
  min-width: 0;
}

.error-shell h1 {
  margin: 0;
  font-size: clamp(42px, 8vw, 84px);
  line-height: 1;
  letter-spacing: 0;
}

.error-shell p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 18px;
  line-height: 1.8;
}

.error-shell .primary-btn {
  width: fit-content;
}

@media (max-width: 980px) {
  .site-header {
    height: auto;
    min-height: 66px;
  }

  .nav {
    display: none;
  }

  .header-action {
    min-width: 96px;
  }

  .hero {
    min-height: 860px;
  }

  .hero-panel,
  .intro-grid,
  .hardware-grid,
  .timeline,
  .news-grid,
  .platform,
  .devices,
  .scene-layout,
  .contact {
    grid-template-columns: 1fr;
  }

  .news-heading {
    display: grid;
    align-items: start;
  }

  .section-link-primary {
    width: fit-content;
  }

  .device-text {
    position: static;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 12px 16px;
  }

  .brand {
    min-width: 0;
  }

  html[data-language="en"] .brand {
    min-width: 150px;
  }

  html[data-language="en"] .brand-logo {
    width: 150px;
    height: 38px;
    padding: 0;
  }

  .brand small,
  .header-action {
    display: none;
  }

  .header-tools {
    margin-left: auto;
  }

  .language-picker span {
    display: none;
  }

  .hero {
    min-height: 760px;
    padding: 112px 18px 42px;
  }

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

  .hero-panel div {
    padding: 16px;
  }

  .section {
    padding: 58px 18px;
  }

  .device-gallery {
    grid-template-columns: 1fr;
  }

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