:root {
  --bg: #05070c;
  --bg-2: #0a1018;
  --bg-3: #101720;
  --panel: rgba(10, 18, 29, 0.78);
  --panel-strong: rgba(13, 24, 37, 0.92);
  --line: rgba(142, 220, 255, 0.18);
  --line-strong: rgba(85, 230, 255, 0.42);
  --text: #eef7ff;
  --muted: #9fb0c1;
  --cyan: #38d8ff;
  --green: #2ff0a4;
  --gold: #f6c85f;
  --coral: #ff7d6e;
  --violet: #b7a3ff;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.42);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(rgba(90, 220, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(90, 220, 255, 0.035) 1px, transparent 1px),
    var(--bg);
  background-size: 42px 42px;
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.6;
}

body.nav-open {
  overflow: hidden;
}

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

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

button {
  font: inherit;
}

.cursor-glow {
  position: fixed;
  left: 0;
  top: 0;
  width: 420px;
  height: 420px;
  pointer-events: none;
  transform: translate3d(-50%, -50%, 0);
  background: linear-gradient(135deg, rgba(56, 216, 255, 0.16), rgba(47, 240, 164, 0.08), transparent 70%);
  filter: blur(28px);
  opacity: 0.75;
  z-index: 1;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 36px;
  border-bottom: 1px solid rgba(120, 210, 255, 0.12);
  background: rgba(3, 8, 14, 0.52);
  backdrop-filter: blur(18px);
  transition: background 220ms ease, padding 220ms ease;
}

.site-header.is-scrolled {
  padding-top: 10px;
  padding-bottom: 10px;
  background: rgba(3, 8, 14, 0.88);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(56, 216, 255, 0.22), rgba(47, 240, 164, 0.1)),
    rgba(255, 255, 255, 0.04);
  color: #eaffff;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
  white-space: nowrap;
}

.brand strong {
  font-size: 16px;
  line-height: 1.2;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: #d9e8f7;
  font-size: 14px;
}

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

.site-nav a::after {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 1px;
  height: 1px;
  content: "";
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

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

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
  transition: transform 180ms ease;
}

.section {
  position: relative;
  padding: 112px 0;
  overflow: hidden;
}

.section-dark {
  background:
    linear-gradient(180deg, rgba(8, 14, 23, 0.92), rgba(4, 7, 12, 0.98)),
    var(--bg);
}

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

.hero {
  min-height: 88vh;
  padding: 130px 0 32px;
}

.hero-canvas,
.hero-bg,
.hero-grid {
  position: absolute;
  inset: 0;
}

.hero-canvas {
  z-index: 0;
  opacity: 0.85;
}

.hero-bg {
  z-index: 0;
  background:
    linear-gradient(90deg, rgba(5, 7, 12, 0.92) 0%, rgba(5, 7, 12, 0.72) 43%, rgba(5, 7, 12, 0.36) 100%),
    linear-gradient(180deg, rgba(5, 7, 12, 0.22), var(--bg) 94%),
    url("./assets/hero-construction-tower.jpg") center right / cover no-repeat;
  filter: saturate(1.1) contrast(1.05);
}

.hero-grid {
  z-index: 0;
  background:
    linear-gradient(120deg, transparent 0 46%, rgba(56, 216, 255, 0.18) 47%, transparent 48% 100%),
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 100% 100%, 72px 72px, 72px 72px;
  mask-image: linear-gradient(90deg, #000 0%, rgba(0, 0, 0, 0.72) 58%, transparent 100%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 0.72fr);
  gap: 54px;
  align-items: center;
}

.eyebrow,
.section-kicker {
  margin: 0 0 18px;
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
}

.hero h1,
.section-head h2,
.intro-copy h2,
.platform-copy h2,
.training-copy h2,
.contact-layout h2 {
  margin: 0;
  line-height: 1.08;
  font-weight: 850;
}

.hero h1 {
  max-width: 760px;
  font-size: 68px;
}

.hero-lead {
  max-width: 650px;
  margin: 24px 0 0;
  color: #c8d8e8;
  font-size: 19px;
}

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

.button-primary,
.button-ghost {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: 6px;
  font-weight: 760;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button-primary {
  border: 1px solid rgba(56, 216, 255, 0.6);
  background: linear-gradient(135deg, rgba(56, 216, 255, 0.95), rgba(47, 240, 164, 0.72));
  color: #021018;
  box-shadow: 0 18px 44px rgba(56, 216, 255, 0.24);
}

.button-ghost {
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

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

.hero-visual {
  align-self: end;
  transform-style: preserve-3d;
}

.visual-frame,
.platform-screen,
.training-media,
.case-card,
.service-card,
.timeline-item,
.advantage {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.visual-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1.12;
}

.visual-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.98) contrast(1.08);
}

.visual-frame::before,
.platform-screen::before {
  position: absolute;
  inset: 0;
  content: "";
  border: 1px solid rgba(56, 216, 255, 0.22);
  border-radius: inherit;
  pointer-events: none;
}

.scan-line {
  position: absolute;
  left: 0;
  right: 0;
  top: -18%;
  height: 18%;
  background: linear-gradient(180deg, transparent, rgba(56, 216, 255, 0.32), transparent);
  animation: scan 4.4s ease-in-out infinite;
}

.visual-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 10px;
}

.visual-strip img {
  height: 98px;
  width: 100%;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 6px;
}

.metric-ribbon {
  position: relative;
  z-index: 3;
  display: grid;
  width: min(var(--max), calc(100% - 48px));
  margin: 52px auto 0;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid rgba(120, 210, 255, 0.18);
  border-radius: 8px;
  background: rgba(5, 12, 20, 0.72);
  backdrop-filter: blur(18px);
}

.metric-ribbon div {
  min-height: 108px;
  padding: 22px;
  border-right: 1px solid rgba(120, 210, 255, 0.12);
}

.metric-ribbon div:last-child {
  border-right: 0;
}

.metric-ribbon strong {
  color: var(--cyan);
  font-size: 34px;
  line-height: 1;
}

.metric-ribbon span {
  color: var(--green);
  font-weight: 760;
}

.metric-ribbon small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

.intro-band {
  padding: 58px 0;
  border-top: 1px solid rgba(120, 210, 255, 0.12);
  border-bottom: 1px solid rgba(120, 210, 255, 0.12);
  background:
    linear-gradient(90deg, rgba(56, 216, 255, 0.08), transparent 38%),
    linear-gradient(270deg, rgba(246, 200, 95, 0.08), transparent 46%),
    var(--bg-2);
}

.two-column {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 56px;
  align-items: start;
}

.intro-copy h2,
.section-head h2,
.platform-copy h2,
.training-copy h2,
.contact-layout h2 {
  font-size: 42px;
}

.intro-copy p,
.section-head p,
.platform-copy p,
.training-copy p,
.contact-layout p {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.section-head {
  max-width: 820px;
  margin-bottom: 46px;
}

.section-head.narrow {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head.compact {
  margin-bottom: 0;
}

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

.service-card {
  position: relative;
  min-height: 260px;
  padding: 28px;
  overflow: hidden;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.service-card::after {
  position: absolute;
  inset: auto 0 0;
  height: 3px;
  content: "";
  background: linear-gradient(90deg, var(--cyan), var(--green), var(--gold));
  transform: scaleX(0.3);
  transform-origin: left;
  transition: transform 180ms ease;
}

.service-card:hover {
  border-color: rgba(56, 216, 255, 0.5);
  background: rgba(12, 24, 38, 0.94);
}

.service-card:hover::after {
  transform: scaleX(1);
}

.service-card span,
.timeline-item span,
.case-card span,
.advantage span {
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
}

.service-card h3,
.timeline-item h3,
.case-card h3,
.course-grid h3 {
  margin: 14px 0 10px;
  line-height: 1.25;
  font-size: 21px;
}

.service-card p,
.timeline-item p,
.case-card p,
.course-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.platform-section {
  border-top: 1px solid rgba(120, 210, 255, 0.12);
  border-bottom: 1px solid rgba(120, 210, 255, 0.12);
}

.platform-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(420px, 1fr);
  gap: 56px;
  align-items: center;
}

.platform-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.platform-tags span {
  padding: 9px 12px;
  border: 1px solid rgba(120, 210, 255, 0.2);
  border-radius: 6px;
  color: #cfe9f8;
  background: rgba(255, 255, 255, 0.045);
  font-size: 13px;
}

.platform-screen {
  position: relative;
  overflow: hidden;
  padding: 10px;
}

.platform-screen img {
  width: 100%;
  min-height: 320px;
  object-fit: cover;
  border-radius: 5px;
}

.screen-caption {
  position: absolute;
  left: 22px;
  bottom: 22px;
  padding: 7px 10px;
  border: 1px solid rgba(56, 216, 255, 0.36);
  border-radius: 5px;
  background: rgba(1, 7, 12, 0.78);
  color: #dffaff;
  font-size: 12px;
}

.lifecycle {
  background:
    linear-gradient(180deg, rgba(11, 17, 27, 0.42), transparent),
    var(--bg);
}

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

.timeline::before {
  position: absolute;
  left: 4%;
  right: 4%;
  top: 30px;
  height: 1px;
  content: "";
  background: linear-gradient(90deg, transparent, var(--cyan), var(--green), var(--gold), transparent);
}

.timeline-item {
  position: relative;
  min-height: 230px;
  padding: 72px 24px 24px;
}

.timeline-item::before {
  position: absolute;
  top: 21px;
  left: 24px;
  width: 18px;
  height: 18px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  content: "";
  background: var(--bg);
  box-shadow: 0 0 0 8px rgba(56, 216, 255, 0.08);
}

.training-section {
  background:
    linear-gradient(90deg, rgba(183, 163, 255, 0.08), transparent 34%),
    var(--bg-2);
}

.training-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.48fr) minmax(0, 1fr);
  gap: 52px;
  align-items: center;
}

.training-media {
  overflow: hidden;
  padding: 10px;
}

.training-media img {
  width: 100%;
  min-height: 280px;
  object-fit: cover;
  border-radius: 5px;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 30px;
}

.course-grid > div {
  min-height: 150px;
  padding: 22px;
  border: 1px solid rgba(120, 210, 255, 0.15);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.035);
}

.cases-section {
  border-top: 1px solid rgba(120, 210, 255, 0.12);
  border-bottom: 1px solid rgba(120, 210, 255, 0.12);
}

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

.case-card {
  overflow: hidden;
  transition: transform 180ms ease, border-color 180ms ease;
}

.case-card:hover {
  border-color: rgba(47, 240, 164, 0.45);
}

.case-card img {
  width: 100%;
  aspect-ratio: 1.72;
  object-fit: cover;
}

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

.case-card.feature {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  align-items: stretch;
}

.case-card.feature img {
  height: 100%;
  aspect-ratio: auto;
}

.advantage-section {
  background:
    linear-gradient(120deg, rgba(47, 240, 164, 0.06), transparent 38%),
    linear-gradient(300deg, rgba(255, 125, 110, 0.08), transparent 46%),
    var(--bg);
}

.advantage-layout {
  display: grid;
  grid-template-columns: 0.7fr 1fr;
  gap: 44px;
  align-items: start;
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.advantage {
  min-height: 104px;
  padding: 22px;
  color: #dfeefb;
  font-weight: 700;
}

.advantage span {
  display: block;
  margin-bottom: 8px;
}

.contact-section {
  padding: 82px 0;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
  padding: 36px;
  border: 1px solid rgba(120, 210, 255, 0.18);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(56, 216, 255, 0.11), transparent 40%),
    rgba(255, 255, 255, 0.035);
}

.site-footer {
  padding: 24px 0;
  border-top: 1px solid rgba(120, 210, 255, 0.12);
  background: #03060a;
  color: var(--muted);
  font-size: 13px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

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

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 620ms ease, transform 620ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-tilt] {
  will-change: transform;
}

@keyframes scan {
  0%,
  14% {
    transform: translateY(0);
    opacity: 0;
  }
  28% {
    opacity: 1;
  }
  78%,
  100% {
    transform: translateY(760%);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}

@media (max-width: 1020px) {
  .hero-inner,
  .platform-layout,
  .training-layout,
  .advantage-layout {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 52px;
  }

  .hero-visual {
    max-width: 680px;
  }

  .metric-ribbon,
  .service-grid,
  .timeline,
  .case-grid,
  .advantage-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .case-card.feature {
    grid-column: span 2;
  }

  .two-column {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}

@media (max-width: 760px) {
  .site-header {
    padding: 12px 18px;
  }

  .nav-toggle {
    display: block;
    position: relative;
    z-index: 43;
  }

  .site-nav {
    position: fixed;
    top: 68px;
    right: 14px;
    z-index: 42;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    width: min(260px, calc(100vw - 28px));
    gap: 4px;
    padding: 14px;
    border: 1px solid rgba(120, 210, 255, 0.18);
    border-radius: 8px;
    background: rgba(3, 8, 14, 0.94);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: transform 180ms ease, opacity 180ms ease;
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    width: 100%;
    padding: 12px;
    border-radius: 6px;
    color: #eaf6ff;
    font-size: 18px;
    font-weight: 800;
  }

  .site-nav a:hover {
    background: rgba(56, 216, 255, 0.08);
  }

  .nav-toggle.is-open span:first-child {
    transform: translateY(3.5px) rotate(45deg);
  }

  .nav-toggle.is-open span:last-child {
    transform: translateY(-3.5px) rotate(-45deg);
  }

  .section {
    padding: 78px 0;
  }

  .container,
  .hero-inner,
  .metric-ribbon {
    width: min(100% - 28px, var(--max));
  }

  .hero {
    min-height: auto;
    padding-top: 112px;
  }

  .hero-inner {
    gap: 36px;
  }

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

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button-primary,
  .button-ghost {
    width: 100%;
  }

  .visual-strip {
    grid-template-columns: 1fr;
  }

  .visual-strip img {
    height: 120px;
  }

  .metric-ribbon,
  .service-grid,
  .timeline,
  .case-grid,
  .course-grid,
  .advantage-grid {
    grid-template-columns: 1fr;
  }

  .metric-ribbon div {
    border-right: 0;
    border-bottom: 1px solid rgba(120, 210, 255, 0.12);
  }

  .metric-ribbon div:last-child {
    border-bottom: 0;
  }

  .intro-copy h2,
  .section-head h2,
  .platform-copy h2,
  .training-copy h2,
  .contact-layout h2 {
    font-size: 32px;
  }

  .section-head.narrow {
    text-align: left;
  }

  .timeline::before {
    left: 33px;
    right: auto;
    top: 0;
    bottom: 0;
    width: 1px;
    height: auto;
    background: linear-gradient(180deg, transparent, var(--cyan), var(--green), var(--gold), transparent);
  }

  .case-card.feature {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }

  .case-card.feature img {
    aspect-ratio: 1.72;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    padding: 26px;
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 430px) {
  .brand small {
    display: none;
  }

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

  .service-card,
  .timeline-item,
  .case-card div,
  .course-grid > div,
  .advantage {
    padding: 20px;
  }
}