:root {
  --bg: #070b14;
  --bg-2: #0e1624;
  --ink: #f2f6ff;
  --muted: #93a4c0;
  --line: rgba(255, 255, 255, 0.1);
  --cyan: #3d8bfd;
  --cyan-deep: #1f5fd0;
  --panel: rgba(255, 255, 255, 0.04);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --display: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(900px 520px at 90% -5%, rgba(61, 139, 253, 0.28) 0%, transparent 55%),
    radial-gradient(700px 480px at -10% 40%, rgba(31, 95, 208, 0.18) 0%, transparent 50%),
    linear-gradient(165deg, #070b14 0%, #0c1422 50%, #0a101c 100%);
}

.top {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px clamp(18px, 4vw, 48px);
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 20, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.top.scrolled {
  border-bottom-color: var(--line);
  background: rgba(7, 11, 20, 0.92);
}

.brand-cluster {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.logo img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}
.logo-text {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}
.logo-app { color: #fff; }
.logo-dtd { color: var(--cyan); }
.logo-com { color: var(--muted); font-weight: 700; font-size: 0.92em; }

.app-menu { position: relative; }
.menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
}
.menu-btn:hover,
.menu-btn[aria-expanded="true"] {
  background: rgba(61, 139, 253, 0.12);
  border-color: var(--line);
}
.menu-bars {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 20px;
  height: 16px;
}
.menu-bars i {
  display: block;
  width: 20px;
  height: 2.5px;
  border-radius: 2px;
  background: #e8eefc;
}
.menu-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 168px;
  padding: 8px;
  border-radius: 12px;
  background: #121a2b;
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  z-index: 40;
}
.menu-panel[hidden] { display: none; }
.menu-panel a {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
}
.menu-panel a:hover {
  background: rgba(61, 139, 253, 0.14);
  color: #9ec5ff;
}

.nav { display: flex; gap: 18px; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
}
.nav a:hover { color: #fff; }

.hero {
  min-height: min(92dvh, 920px);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
  padding: clamp(24px, 5vw, 64px) clamp(18px, 4vw, 48px) clamp(48px, 8vw, 88px);
  overflow: hidden;
}
.hero-copy {
  max-width: 640px;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.85s ease forwards 0.06s;
}
.brand-signal {
  margin: 0 0 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.brand-mark {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  object-fit: cover;
  box-shadow: 0 12px 36px rgba(61, 139, 253, 0.28);
}
.brand-name {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: -0.02em;
  line-height: 1;
}
.brand-name .cyan { color: var(--cyan); }
.brand-name .dim { color: var(--muted); font-size: 0.72em; }

.hero h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.4vw, 2.45rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
  max-width: 16ch;
}
.lead {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1.06rem;
  max-width: 40ch;
  font-weight: 600;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 800;
  background: linear-gradient(135deg, var(--cyan), var(--cyan-deep));
  color: #fff;
  border: 1px solid transparent;
  transition: transform 0.15s ease, filter 0.15s ease;
}
.cta:hover { filter: brightness(1.08); transform: translateY(-1px); }
.cta.soft {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
  font-weight: 700;
}
.cta.soft:hover { border-color: var(--cyan); color: #9ec5ff; }

.hero-visual {
  min-height: 320px;
  opacity: 0;
  transform: translateY(22px) scale(0.98);
  animation: rise-soft 1s ease forwards 0.2s;
}
.visual-plane {
  position: relative;
  height: min(520px, 64dvh);
  border-radius: 28px;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 70% 30%, rgba(61, 139, 253, 0.35), transparent 45%),
    linear-gradient(160deg, #10192b 0%, #0a1220 55%, #132038 100%);
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.45);
}
.plane-grid {
  position: absolute;
  inset: -20%;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  transform: perspective(700px) rotateX(22deg) scale(1.2);
  transform-origin: center 75%;
  animation: drift 16s linear infinite;
}
.plane-orbit {
  position: absolute;
  inset: 12%;
  border: 1px dashed rgba(61, 139, 253, 0.35);
  border-radius: 50%;
  animation: spin 28s linear infinite;
}
.plane-orbit::after {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 16px rgba(61, 139, 253, 0.8);
}
.plane-logo {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(220px, 48%);
  height: auto;
  transform: translate(-50%, -50%);
  border-radius: 28px;
  filter: drop-shadow(0 18px 40px rgba(61, 139, 253, 0.35));
  animation: float 5.5s ease-in-out infinite;
}
.plane-scan {
  position: absolute;
  left: 0;
  right: 0;
  height: 28%;
  background: linear-gradient(180deg, transparent, rgba(61, 139, 253, 0.12), transparent);
  animation: scan 4.5s ease-in-out infinite;
}

.services,
.flow,
.contact {
  padding: clamp(48px, 8vw, 96px) clamp(18px, 4vw, 48px);
  max-width: 1100px;
  margin: 0 auto;
}
.services h2,
.flow h2,
.contact h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
}
.section-lead {
  margin: 10px 0 0;
  color: var(--muted);
  max-width: 52ch;
  font-weight: 600;
}

.service-list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.service-list li {
  display: grid;
  grid-template-columns: minmax(180px, 260px) 1fr;
  gap: 16px 28px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(12px);
}
.service-list li.in {
  opacity: 1;
  transform: none;
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.service-list strong {
  font-family: var(--display);
  font-size: 1.15rem;
}
.service-list span { color: var(--muted); }

.flow {
  max-width: none;
  background: linear-gradient(180deg, rgba(61, 139, 253, 0.08), rgba(61, 139, 253, 0.02));
  border-block: 1px solid var(--line);
}
.flow h2,
.flow .section-lead,
.flow-list {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
  padding-inline: clamp(18px, 4vw, 48px);
}
.flow .section-lead { margin-top: 10px; }
.flow-list {
  list-style: none;
  margin: 32px auto 0;
  padding-top: 0;
  display: grid;
  gap: 18px;
}
.flow-list li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.flow-list li:last-child { border-bottom: 0; }
.flow-list em {
  font-family: var(--display);
  font-style: normal;
  font-weight: 800;
  color: var(--cyan);
  font-size: 1.25rem;
}
.flow-list strong {
  display: block;
  font-family: var(--display);
  font-size: 1.12rem;
  margin-bottom: 4px;
}
.flow-list span { color: var(--muted); font-weight: 600; }

.people {
  margin-top: 36px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 40px;
}
.person {
  padding: 20px 0 0;
  border-top: 2px solid var(--cyan);
  background: transparent;
}
.person h3 {
  margin: 0 0 12px;
  font-family: var(--display);
  font-size: 1.35rem;
}
.person a {
  display: block;
  width: fit-content;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  margin-top: 8px;
}
.person .phone {
  font-size: 1.35rem;
  letter-spacing: 0.02em;
}
.person .zalo { color: var(--cyan); }
.person .mail {
  color: var(--muted);
  font-weight: 600;
  word-break: break-all;
}
.person a:hover { color: #9ec5ff; }

.foot {
  padding: 28px clamp(18px, 4vw, 48px) 40px;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.foot-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 800;
  font-family: var(--display);
}
.foot-brand img {
  width: 28px;
  height: 28px;
  border-radius: 8px;
}

@keyframes rise {
  to { opacity: 1; transform: none; }
}
@keyframes rise-soft {
  to { opacity: 1; transform: none; }
}
@keyframes drift {
  from { background-position: 0 0, 0 0; }
  to { background-position: 44px 44px, 44px 44px; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes float {
  0%, 100% { transform: translate(-50%, -50%); }
  50% { transform: translate(-50%, calc(-50% - 10px)); }
}
@keyframes scan {
  0% { top: -30%; opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero h1 { max-width: none; }
  .hero-visual { order: -1; }
  .visual-plane { height: 260px; border-radius: 20px; }
  .brand-mark { width: 56px; height: 56px; }
  .service-list li {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .people { grid-template-columns: 1fr; }
  .logo-text { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-copy,
  .hero-visual,
  .service-list li,
  .plane-grid,
  .plane-orbit,
  .plane-logo,
  .plane-scan {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  .plane-logo { transform: translate(-50%, -50%) !important; }
}