:root {
  --navy: #071a2e;
  --navy-2: #0b2844;
  --blue: #1976d2;
  --sky: #5db6e8;
  --gold: #e5a72c;
  --ink: #132238;
  --muted: #637286;
  --line: #dfe7ef;
  --paper: #f5f8fb;
  --white: #fff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}

a { color: inherit; text-decoration: none; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  color: var(--white);
  background: rgba(5, 21, 38, .88);
  border-bottom: 1px solid rgba(255,255,255,.1);
  backdrop-filter: blur(14px);
}

.nav { height: 78px; display: flex; align-items: center; gap: 34px; }
.brand { display: flex; align-items: center; gap: 12px; margin-right: auto; }
.brand-mark {
  position: relative;
  width: 41px;
  height: 41px;
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 50%;
}
.brand-mark::before {
  content: "";
  position: absolute;
  width: 27px;
  height: 8px;
  left: 7px;
  top: 16px;
  background: linear-gradient(90deg, var(--gold), #fff);
  clip-path: polygon(0 40%, 70% 40%, 100% 0, 82% 50%, 100% 100%, 70% 60%, 0 60%);
  transform: rotate(-10deg);
}
.brand strong { display: block; font-size: 15px; letter-spacing: .08em; }
.brand small { display: block; color: #a9bfd2; font-size: 10px; letter-spacing: .14em; }
.nav-links { display: flex; gap: 28px; font-size: 14px; color: #d9e6f0; }
.nav-links a:hover { color: var(--white); }
.language {
  padding: 8px 13px;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 6px;
  color: var(--white);
  font-size: 13px;
}
.language:hover { background: rgba(255,255,255,.1); }

.hero {
  position: relative;
  min-height: 720px;
  display: grid;
  align-items: center;
  overflow: hidden;
  color: var(--white);
  background-color: #071a2e;
  background-position: center;
  background-size: cover;
}
.hero-carousel { position: relative; overflow: hidden; }
.hero-track { display: flex; transition: transform .65s cubic-bezier(.65,0,.35,1); }
.hero-slide { position: relative; min-width: 100%; }
.hero-slide:nth-child(1) .hero { background-image: url("https://upload.wikimedia.org/wikipedia/commons/d/d0/HKIA_at_night.jpg"); }
.hero-slide:nth-child(2) .hero { background-image: url("https://upload.wikimedia.org/wikipedia/commons/8/80/ISMALA.jpg"); background-position: center 48%; }
.hero-slide:nth-child(3) .hero { background-image: url("https://upload.wikimedia.org/wikipedia/commons/d/de/Airbus_A380.jpg"); background-position: center 42%; }
.hero-slide .hero::after {
  content: "";
  position: absolute;
  z-index: 1;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(3,15,28,.96) 0%, rgba(4,22,39,.89) 35%, rgba(5,24,41,.48) 63%, rgba(5,19,32,.18) 100%),
    linear-gradient(0deg, rgba(2,12,22,.62), transparent 45%);
}
.carousel-arrow {
  position: absolute;
  z-index: 8;
  top: 48%;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 50%;
  color: #fff;
  background: rgba(4,18,31,.42);
  font-size: 25px;
  cursor: pointer;
  backdrop-filter: blur(7px);
}
.carousel-arrow:hover { background: rgba(4,18,31,.72); }
.carousel-prev { left: 20px; }
.carousel-next { right: 20px; }
.carousel-dots { position: absolute; z-index: 9; left: 50%; bottom: 122px; display: flex; gap: 9px; transform: translateX(-50%); }
.carousel-dot { width: 9px; height: 9px; padding: 0; border: 1px solid rgba(255,255,255,.7); border-radius: 50%; background: transparent; cursor: pointer; }
.carousel-dot.active { width: 26px; border-radius: 10px; background: var(--gold); border-color: var(--gold); }
.turbine-visual { position: absolute; width: 300px; height: 300px; right: 52px; top: 62px; border: 36px solid #b9cbd5; border-radius: 50%; box-shadow: inset 0 0 0 10px #597486, 0 28px 50px rgba(0,0,0,.38); }
.turbine-visual::before { content: ""; position: absolute; inset: 35px; border-radius: 50%; background: repeating-conic-gradient(#7892a0 0 8deg, #d3dfe5 9deg 17deg); box-shadow: inset 0 0 0 50px #173449; }
.turbine-visual::after { content: ""; position: absolute; width: 48px; height: 48px; left: 50%; top: 50%; border-radius: 50%; background: #081725; transform: translate(-50%,-50%); box-shadow: 0 0 0 13px #7e98a6; }
.cargo-scene { position: absolute; inset: 90px -20px 30px 40px; }
.cargo-box { position: absolute; bottom: 55px; width: 145px; height: 115px; background: linear-gradient(135deg,#d7b477,#977342); border: 4px solid #75552f; box-shadow: 0 18px 25px rgba(0,0,0,.28); }
.cargo-box::before, .cargo-box::after { content:""; position:absolute; background:#6d4e2c; }
.cargo-box::before { width: 7px; height: 100%; left: 48%; }
.cargo-box::after { width: 100%; height: 7px; top: 48%; }
.box-one { right: 235px; }
.box-two { right: 74px; bottom: 34px; transform: scale(.82); }
.cargo-plane { position:absolute; right:0; top:15px; width:430px; height:75px; border-radius:50%; background:linear-gradient(#f5fbfe,#8ba3b1); clip-path:polygon(0 40%,80% 4%,100% 48%,95% 70%,15% 88%); transform:rotate(-4deg); }
.cargo-plane::before { content:""; position:absolute; width:220px; height:90px; left:120px; top:35px; background:#afc0ca; clip-path:polygon(20% 0,100% 85%,92% 100%,0 25%); }
.hero::before {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 36%;
  opacity: .35;
  background:
    linear-gradient(165deg, transparent 47%, rgba(255,255,255,.16) 48%, transparent 49%) 0 0 / 100% 100%,
    linear-gradient(90deg, rgba(1,11,22,.9), rgba(17,49,71,.65));
}
.hero-grid { position: relative; z-index: 3; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; padding-top: 78px; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; color: #9fd7f3; font-size: 13px; letter-spacing: .18em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 32px; height: 2px; background: var(--gold); }
.hero h1 { max-width: 700px; margin: 20px 0 24px; font-size: clamp(45px, 5.4vw, 76px); line-height: 1.08; letter-spacing: -.035em; }
.hero h1 span { color: #83cef2; }
.hero-copy { max-width: 590px; margin: 0 0 34px; color: #c4d6e4; font-size: 17px; }
.actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 0 24px; border-radius: 5px; font-size: 14px; font-weight: 700; letter-spacing: .03em; transition: .2s ease; }
.btn-primary { background: var(--gold); color: #172437; }
.btn-primary:hover { background: #f0b642; transform: translateY(-2px); }
.btn-secondary { border: 1px solid rgba(255,255,255,.36); color: var(--white); }
.btn-secondary:hover { background: rgba(255,255,255,.08); }

.plane-scene { position: relative; height: 430px; opacity: 0; pointer-events: none; }
.sun { position: absolute; right: 8%; top: 6%; width: 190px; height: 190px; border-radius: 50%; background: radial-gradient(circle, rgba(255,213,138,.45), rgba(255,195,90,.06) 60%, transparent 70%); }
.plane {
  position: absolute;
  width: 570px;
  height: 165px;
  right: -75px;
  top: 122px;
  filter: drop-shadow(0 26px 24px rgba(0,0,0,.35));
  transform: rotate(-4deg);
}
.fuselage {
  position: absolute;
  width: 480px;
  height: 62px;
  right: 8px;
  top: 47px;
  border-radius: 60% 18% 20% 55%;
  background: linear-gradient(#f8fcff, #b8cbd7 58%, #7893a3);
  clip-path: polygon(0 38%, 9% 14%, 79% 4%, 100% 43%, 98% 62%, 18% 88%, 2% 68%);
}
.windows { position: absolute; z-index: 2; width: 315px; height: 7px; top: 65px; right: 95px; opacity: .8; background: repeating-linear-gradient(90deg, #143d5e 0 7px, transparent 7px 14px); transform: skewY(-1deg); }
.wing {
  position: absolute;
  z-index: 3;
  width: 305px;
  height: 112px;
  right: 150px;
  top: 75px;
  background: linear-gradient(145deg, #dbe6ed, #758d9c);
  clip-path: polygon(34% 0, 96% 86%, 92% 100%, 0 25%);
}
.tail {
  position: absolute;
  width: 100px;
  height: 104px;
  left: 23px;
  top: 1px;
  background: linear-gradient(130deg, #e8f1f5, #607d91);
  clip-path: polygon(68% 0, 100% 76%, 0 100%, 35% 66%);
}
.engine {
  position: absolute;
  z-index: 4;
  width: 78px;
  height: 42px;
  right: 215px;
  top: 121px;
  border: 7px solid #809aa9;
  border-radius: 50%;
  background: radial-gradient(circle, #182c3a 0 26%, #617a89 28% 42%, #d5e1e6 45%);
}
.runway-line { position: absolute; right: -20%; bottom: 48px; width: 125%; height: 2px; background: rgba(255,255,255,.5); transform: rotate(-8deg); }
.stat-strip { position: absolute; z-index: 4; inset: auto 0 0; background: rgba(4,17,31,.78); border-top: 1px solid rgba(255,255,255,.1); backdrop-filter: blur(8px); }
.stats { min-height: 105px; display: grid; grid-template-columns: repeat(3, 1fr); align-items: center; }
.stat { padding-left: 30px; border-left: 1px solid rgba(255,255,255,.14); }
.stat:first-child { padding-left: 0; border: 0; }
.stat strong { display: block; color: var(--white); font-size: 25px; }
.stat span { color: #9eb4c5; font-size: 13px; }

.section { padding: 100px 0; }
.section-soft { background: var(--paper); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 48px; }
.kicker { color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.section h2 { max-width: 690px; margin: 10px 0 0; font-size: clamp(31px, 4vw, 48px); line-height: 1.2; letter-spacing: -.025em; }
.section-head p { max-width: 410px; margin: 0; color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card { padding: 34px; background: var(--white); border: 1px solid var(--line); border-radius: 9px; box-shadow: 0 10px 32px rgba(21,54,82,.05); transition: .25s ease; }
.card:hover { transform: translateY(-5px); box-shadow: 0 16px 38px rgba(21,54,82,.1); }
.icon { width: 52px; height: 52px; display: grid; place-items: center; margin-bottom: 28px; border-radius: 8px; background: #eaf4fb; color: var(--blue); font-size: 23px; }
.card h3 { margin: 0 0 12px; font-size: 20px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

.about-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; align-items: center; }
.visual-panel { position: relative; min-height: 460px; overflow: hidden; border-radius: 10px; background: linear-gradient(145deg, #0d3150, #277da8); }
.visual-panel::before { content: ""; position: absolute; width: 380px; height: 380px; left: -80px; top: -90px; border: 1px solid rgba(255,255,255,.18); border-radius: 50%; box-shadow: 0 0 0 70px rgba(255,255,255,.035), 0 0 0 140px rgba(255,255,255,.025); }
.part-ring { position: absolute; width: 230px; height: 230px; left: 50%; top: 50%; transform: translate(-50%,-50%); border: 35px solid #b9ccd7; border-radius: 50%; box-shadow: inset 0 0 0 8px #587385, 0 25px 50px rgba(0,0,0,.3); }
.part-ring::before { content: ""; position: absolute; inset: 35px; border-radius: 50%; background: radial-gradient(circle, #0b1f30 0 22%, #506b7b 24% 30%, #142c3d 32% 58%, #6e8795 60%); }
.badge { position: absolute; right: 24px; bottom: 24px; width: 155px; padding: 18px; color: var(--white); background: rgba(5,23,38,.82); border-left: 3px solid var(--gold); font-size: 12px; }
.about-copy p { color: var(--muted); }
.checks { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 24px; margin-top: 30px; }
.check { font-weight: 700; font-size: 14px; }
.check::before { content: "✓"; display: inline-grid; place-items: center; width: 22px; height: 22px; margin-right: 9px; border-radius: 50%; background: #e8f5fc; color: var(--blue); }

.contact { color: var(--white); background: linear-gradient(120deg, var(--navy), #103b5e); }
.contact-grid { display: grid; grid-template-columns: 1fr .9fr; gap: 80px; align-items: center; }
.contact h2 { margin-top: 12px; }
.contact p { color: #b5c8d7; }
.contact-list { display: grid; gap: 12px; margin-top: 30px; color: #e0ebf2; font-size: 14px; }
.form { padding: 32px; background: var(--white); border-radius: 10px; color: var(--ink); }
.field { margin-bottom: 15px; }
.field label { display: block; margin-bottom: 6px; font-size: 12px; font-weight: 800; color: #526276; }
.field input, .field textarea { width: 100%; padding: 13px 14px; border: 1px solid #d9e2ea; border-radius: 5px; font: inherit; }
.field textarea { min-height: 90px; resize: vertical; }
.form .btn { width: 100%; border: 0; cursor: pointer; }

.footer { padding: 30px 0; color: #8ea5b6; background: #04111e; font-size: 12px; }
.footer-row { display: flex; justify-content: space-between; gap: 20px; }
.image-credits { margin-top: 10px; color: #60798c; font-size: 10px; }
.image-credits a { text-decoration: underline; }

.tabs-section { padding: 92px 0 105px; background: var(--paper); }
.tabs-intro { margin-bottom: 34px; text-align: center; }
.tabs-intro h2 { margin: 8px 0 10px; font-size: clamp(30px, 4vw, 46px); }
.tabs-intro p { max-width: 650px; margin: auto; color: var(--muted); }
.tab-shell { overflow: hidden; background: var(--white); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 18px 55px rgba(22,55,83,.09); }
.tab-list { display: grid; grid-template-columns: repeat(4, 1fr); background: #eaf0f5; border-bottom: 1px solid var(--line); }
.tab-button {
  min-height: 72px;
  padding: 12px;
  border: 0;
  border-right: 1px solid #d5e0e9;
  color: #52677a;
  background: transparent;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: .2s ease;
}
.tab-button:last-child { border-right: 0; }
.tab-button:hover { color: var(--blue); background: #f4f8fb; }
.tab-button.active { color: var(--white); background: var(--navy-2); box-shadow: inset 0 -4px var(--gold); }
.tab-panel { display: none; min-height: 380px; padding: 52px; }
.tab-panel.active { display: block; animation: tabFade .25s ease; }
@keyframes tabFade { from { opacity: 0; transform: translateY(7px); } to { opacity: 1; transform: none; } }
.tab-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 55px; align-items: center; }
.tab-label { color: var(--blue); font-size: 12px; font-weight: 900; letter-spacing: .17em; text-transform: uppercase; }
.tab-panel h3 { margin: 8px 0 18px; font-size: 30px; line-height: 1.25; }
.tab-panel p { color: var(--muted); }
.tab-feature {
  min-height: 250px;
  display: grid;
  place-items: center;
  padding: 35px;
  overflow: hidden;
  color: var(--white);
  text-align: center;
  border-radius: 9px;
  background:
    radial-gradient(circle at 70% 20%, rgba(100,199,242,.35), transparent 28%),
    linear-gradient(135deg, #082039, #16587d);
}
.tab-feature strong { display: block; font-size: 45px; line-height: 1; }
.tab-feature span { display: block; margin-top: 12px; color: #bcd6e6; font-size: 13px; letter-spacing: .08em; }
.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.info-item { padding: 20px; border: 1px solid var(--line); border-radius: 7px; background: #fbfdff; }
.info-item strong { display: block; margin-bottom: 5px; color: var(--navy-2); }
.info-item span { color: var(--muted); font-size: 13px; }
.product-tags { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 25px; }
.product-tags span { padding: 9px 14px; color: #245272; background: #eaf5fb; border: 1px solid #cce5f2; border-radius: 4px; font-size: 13px; }
.friend-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.friend-links a { padding: 19px 20px; border: 1px solid var(--line); border-radius: 7px; color: var(--navy-2); font-weight: 800; background: #fbfdff; }
.friend-links a::after { content: " ↗"; color: var(--blue); }
.friend-links a:hover { border-color: #9ccce7; background: #f1f9fd; }
.simple-contact { padding: 75px 0; color: var(--white); background: linear-gradient(120deg, var(--navy), #104568); }
.simple-contact-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 70px; align-items: center; }
.simple-contact h2 { margin: 8px 0 12px; font-size: 38px; }
.simple-contact p { margin: 0; color: #b9ccda; }
.contact-box { display: grid; gap: 13px; padding: 28px; border: 1px solid rgba(255,255,255,.17); border-radius: 9px; background: rgba(255,255,255,.06); }
.contact-box a, .contact-box span { color: #e4eef4; }
.contact-box a, .contact-box span { overflow-wrap: anywhere; }

.construction-modal {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(3, 14, 26, .76);
  backdrop-filter: blur(7px);
}
.construction-modal[hidden] { display: none; }
.construction-dialog {
  position: relative;
  width: min(470px, 100%);
  padding: 42px 38px 35px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 13px;
  color: var(--white);
  text-align: center;
  background: linear-gradient(145deg, #0b2945, #071827);
  box-shadow: 0 28px 80px rgba(0,0,0,.4);
}
.construction-dialog::before {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -105px;
  top: -115px;
  border-radius: 50%;
  background: rgba(93,182,232,.16);
}
.construction-icon {
  position: relative;
  width: 66px;
  height: 66px;
  display: grid;
  place-items: center;
  margin: 0 auto 22px;
  border-radius: 50%;
  color: #172437;
  background: var(--gold);
  font-size: 29px;
  font-weight: 900;
}
.construction-dialog h2 { position: relative; margin: 0 0 12px; font-size: 28px; }
.construction-dialog p { position: relative; margin: 0 auto 26px; color: #bfd0dc; }
.construction-dialog .btn { position: relative; min-width: 150px; border: 0; cursor: pointer; }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero { min-height: 820px; }
  .hero-grid { grid-template-columns: 1fr; padding-top: 130px; }
  .plane-scene { height: 300px; }
  .plane { transform: scale(.74) rotate(-4deg); transform-origin: right center; top: 55px; }
  .turbine-visual { transform: scale(.7); transform-origin: right top; right: 20px; }
  .cargo-scene { transform: scale(.76); transform-origin: right top; right: -30px; }
  .cards { grid-template-columns: 1fr; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 45px; }
  .tab-layout, .simple-contact-grid { grid-template-columns: 1fr; gap: 35px; }
  .section-head { display: block; }
  .section-head p { margin-top: 18px; }
}

@media (max-width: 600px) {
  .container { width: min(100% - 28px, 1160px); }
  .brand small { display: none; }
  .nav { height: 68px; }
  .hero { min-height: 850px; }
  .hero h1 { font-size: 43px; }
  .hero-slide .hero::after { background: linear-gradient(90deg, rgba(3,15,28,.94), rgba(3,15,28,.68)); }
  .plane { right: -110px; transform: scale(.63) rotate(-4deg); }
  .carousel-arrow { display: none; }
  .carousel-dots { bottom: 112px; }
  .turbine-visual { right: 35px; top: 30px; transform: scale(.58); }
  .cargo-scene { top: 50px; right: -75px; transform: scale(.58); }
  .stats { grid-template-columns: 1fr 1fr 1fr; }
  .stat { padding-left: 12px; }
  .stat strong { font-size: 18px; }
  .stat span { font-size: 10px; }
  .section { padding: 72px 0; }
  .visual-panel { min-height: 350px; }
  .checks { grid-template-columns: 1fr; }
  .tab-list { grid-template-columns: 1fr 1fr; }
  .tab-button:nth-child(2) { border-right: 0; }
  .tab-button { min-height: 60px; border-bottom: 1px solid #d5e0e9; }
  .tab-panel { min-height: 0; padding: 28px 20px; }
  .info-grid, .friend-links { grid-template-columns: 1fr; }
  .construction-dialog { padding: 35px 23px 28px; }
  .construction-dialog h2 { font-size: 24px; }
  .footer-row { display: block; }
}