:root {
  --bg-dark: #050608;
  --bg-darker: #020304;
  --bg-light: #f5f5f7;
  --bg-card-dark: #11131a;
  --text-main: #ffffff;
  --text-muted: #a0a4b0;
  --accent: #ff7a00;
  --accent-soft: #ffd27a;
  --border-subtle: rgba(255, 255, 255, 0.12);
  --nav-height: 64px;
  --max-width: 1200px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Helvetica Neue", Arial, "MiSans", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
}

body {
  line-height: 1.6;
}

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

a:hover {
  text-decoration: none;
}

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

/* HEADER / NAV */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(5, 6, 8, 0.96);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav-bar {
  max-width: var(--max-width);
  margin: 0 auto;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: #ff6900;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}

.logo-text {
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #f5f5f7;
}

.main-nav {
  flex: 1;
  margin-left: 48px;
}

.nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link,
.nav-link--button {
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 6px 0;
  border: none;
  background: none;
  color: #f0f0f3;
  cursor: pointer;
  opacity: 0.9;
}

.nav-link:hover,
.nav-link--button:hover {
  opacity: 1;
}

.nav-item::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #ff7a00, #ffe266);
  opacity: 0;
  transform: scaleX(0.6);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.nav-item:hover::after,
.nav-item--active::after {
  opacity: 1;
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: none;
  padding: 0;
}

.nav-toggle span {
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background-color: #f5f5f7;
}

/* MEGA MENU */

.nav-item--has-mega {
  position: relative;
}

.mega-menu {
  position: absolute;
  left: 50%;
  transform: translate(-50%, 10px);
  top: calc(100% + 10px);
  min-width: 560px;
  padding: 18px 24px 20px;
  background: radial-gradient(circle at top, #1c1f27 0, #050608 70%);
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
  z-index: 50;
}

.nav-item--has-mega.is-open .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.mega-inner {
  display: flex;
  gap: 40px;
}

.mega-column {
  min-width: 200px;
}

.mega-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.6);
  margin: 0 0 10px;
}

.mega-link {
  display: block;
  font-size: 13px;
  padding: 4px 0;
  color: #f5f5f7;
  opacity: 0.9;
}

.mega-link:hover {
  opacity: 1;
}

/* HERO SECTIONS */

.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-color: var(--bg-dark);
}

.hero--compact {
  min-height: 70vh;
}

.hero--light {
  background-color: #ffffff;
  color: #11131a;
}

.hero--custom {
  min-height: 80vh;
}

.hero-bg-video,
.hero-bg-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-bg-image {
  background-size: cover;
  background-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top, rgba(0, 0, 0, 0.18), rgba(0, 0, 0, 0.8));
}

.hero-overlay--soft {
  background: radial-gradient(circle at top, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.75));
}

.hero-overlay--gradient {
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.75),
    rgba(0, 0, 0, 0.1)
  );
}

.hero-inner {
  position: relative;
  max-width: var(--max-width);
  padding: 120px 24px 96px;
  text-align: center;
}

.hero-inner--left {
  text-align: left;
}

.hero-label {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  margin-bottom: 10px;
  color: rgba(255, 255, 255, 0.7);
}

.hero-title {
  margin: 0 0 12px;
  font-size: 56px;
  line-height: 1.1;
  letter-spacing: 0.08em;
}

.hero-title--medium {
  font-size: 40px;
}

.hero-subtitle {
  margin: 0 0 26px;
  font-size: 18px;
  color: rgba(255, 255, 255, 0.8);
}

.hero--light .hero-label {
  color: rgba(0, 0, 0, 0.6);
}

.hero--light .hero-subtitle {
  color: rgba(0, 0, 0, 0.72);
}

.hero-cta-row {
  display: inline-flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  min-width: 168px;
  height: 44px;
  padding: 0 24px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  font-size: 14px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: transparent;
  color: #ffffff;
}

.btn--primary {
  border-color: transparent;
  background: #ffffff;
  color: #11131a;
}

.btn--primary:hover {
  background: #f0f0f3;
}

.btn--ghost:hover {
  border-color: #ffffff;
}

.btn--small {
  min-width: 132px;
  height: 40px;
  font-size: 12px;
}

/* GENERIC SECTION LAYOUT */

.section {
  padding: 96px 24px;
}

.section--light {
  background-color: var(--bg-light);
  color: #11131a;
}

.section--dark {
  background-color: var(--bg-darker);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-inner--wide {
  max-width: 1280px;
}

.section-header {
  margin-bottom: 40px;
}

.section-header--center {
  text-align: center;
}

.section-title {
  margin: 0 0 8px;
  font-size: 32px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.section-subtitle {
  margin: 0;
  font-size: 15px;
  color: rgba(0, 0, 0, 0.64);
}

.section--dark .section-subtitle {
  color: rgba(255, 255, 255, 0.7);
}

/* SU7 LINEUP COMPARISON */

.compare-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.compare-card {
  background: #ffffff;
  border-radius: 18px;
  padding: 20px 20px 22px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 18px 40px rgba(15, 17, 25, 0.08);
}

.compare-name {
  margin: 0 0 4px;
  font-size: 18px;
}

.compare-price {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 600;
}

.compare-list {
  margin: 0 0 16px;
  padding-left: 18px;
  font-size: 13px;
  color: rgba(0, 0, 0, 0.7);
}

.compare-list li {
  margin-bottom: 4px;
}

.compare-link {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #11131a;
}

/* TECHNOLOGY CARDS */

.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.feature-card {
  background: #ffffff;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.feature-media {
  height: 260px;
  background-size: cover;
  background-position: center;
}

.feature-body {
  padding: 20px 22px 22px;
}

.feature-title {
  margin: 0 0 6px;
  font-size: 18px;
}

.feature-text {
  margin: 0 0 14px;
  font-size: 14px;
  color: rgba(0, 0, 0, 0.74);
}

.feature-link {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* IMAGE CARDS (COCKPIT / ASSISTED) */

.section-inner--grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.image-card {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  background-color: #050608;
}

.image-card-media {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}

.image-card-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at top,
    rgba(0, 0, 0, 0.3),
    rgba(0, 0, 0, 0.85)
  );
}

.image-card-content {
  position: relative;
  padding: 40px 32px 32px;
  min-height: 260px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.image-card-title {
  margin: 0 0 8px;
  font-size: 22px;
}

.image-card-text {
  margin: 0 0 18px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.82);
}

.image-card--right {
  text-align: left;
}

/* FOOTER */

.site-footer {
  background-color: #050608;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 32px 24px 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-copy {
  margin: 8px 0 0;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.55);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
}

/* ANIMATIONS */

[data-animate] {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* RESPONSIVE */

@media (max-width: 1024px) {
  .nav-bar {
    padding-inline: 16px;
  }

  .main-nav {
    position: fixed;
    inset: var(--nav-height) 0 auto 0;
    background: rgba(5, 6, 8, 0.98);
    backdrop-filter: blur(18px);
    transform: translateY(-100%);
    transition: transform 0.2s ease;
  }

  .site-header.is-open .main-nav {
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 20px 20px;
    gap: 12px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .mega-menu {
    position: static;
    transform: none;
    margin-top: 6px;
    min-width: 0;
    width: 100%;
  }

  .mega-inner {
    flex-direction: column;
    gap: 18px;
  }

  .hero-inner {
    padding: 96px 16px 72px;
  }

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

  .hero-title--medium {
    font-size: 32px;
  }

  .section {
    padding: 72px 16px;
  }

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

  .tech-grid,
  .section-inner--grid {
    grid-template-columns: 1fr;
  }

  .image-card-content {
    min-height: 220px;
  }

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

@media (max-width: 640px) {
  .compare-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 80vh;
  }

  .hero-inner {
    padding-top: 80px;
  }

  .section-title {
    font-size: 24px;
  }
}