:root {
  --bg: #071018;
  --bg-2: #0d1823;
  --surface: rgba(255, 255, 255, 0.06);
  --surface-2: rgba(255, 255, 255, 0.1);
  --card-border: rgba(255, 255, 255, 0.12);
  --text: #f4f8fb;
  --muted: #b9c7d3;
  --primary: #13b5ea;
  --primary-2: #73d8ff;
  --white: #ffffff;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  --radius: 22px;
  --radius-sm: 14px;
  --container: 1180px;
  --header-height: 82px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(19, 181, 234, 0.12), transparent 25%),
    radial-gradient(circle at bottom right, rgba(115, 216, 255, 0.08), transparent 25%),
    linear-gradient(180deg, #050b11 0%, #08111a 100%);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

.container {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  backdrop-filter: blur(14px);
  background: rgba(4, 10, 16, 0.75);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.nav-wrap {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-logo {
  width: 110px;
  height: auto;
  margin: 10px;
}

.brand strong {
  display: block;
  font-size: 1rem;
}

.brand span {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.main-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  transition: 0.3s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--white);
  background: rgba(19, 181, 234, 0.14);
}

.menu-toggle {
  display: none;
  font-size: 1.6rem;
  background: transparent;
  color: var(--white);
  border: none;
  cursor: pointer;
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  z-index: 1200;
}

.hero-page {
  position: relative;
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.38);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0,0,0,0.35), rgba(0,0,0,0.7)),
    radial-gradient(circle at center, rgba(19, 181, 234, 0.10), transparent 40%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
  padding: 80px 0;
}

.eyebrow,
.section-tag {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(19, 181, 234, 0.12);
  border: 1px solid rgba(19, 181, 234, 0.25);
  color: var(--primary-2);
  font-size: 0.9rem;
  margin-bottom: 18px;
}

.hero-content h1 {
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  line-height: 1.08;
  margin-bottom: 18px;
}

.hero-content p,
.section-heading p,
.section p {
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: bold;
  border: 1px solid transparent;
  transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #0f89b2);
  color: var(--white);
  box-shadow: 0 10px 30px rgba(19,181,234,0.3);
}

.btn-secondary {
  background: rgba(255,255,255,0.03);
  color: var(--white);
  border-color: rgba(255,255,255,0.14);
}

.section {
  padding: 90px 0;
}

.dark-section {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-top: 1px solid rgba(255,255,255,0.06);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 42px;
}

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

.section h2,
.section-heading h2 {
  font-size: clamp(1.8rem, 3vw, 3rem);
  line-height: 1.15;
  margin-bottom: 16px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
}

.cards-stack,
.feature-grid,
.product-grid {
  display: grid;
  gap: 20px;
}

.feature-grid {
  grid-template-columns: repeat(3, 1fr);
}

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

.glass-card,
.feature-card,
.contact-card,
.tab-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.04));
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.glass-card,
.feature-card,
.tab-card {
  padding: 26px;
}

.contact-card {
  padding: 28px;
}

.glass-card h3,
.feature-card h3,
.tab-card h3 {
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.feature-number {
  font-size: 2.2rem;
  font-weight: bold;
  color: var(--primary-2);
  margin-bottom: 12px;
}

.timeline {
  position: relative;
  display: grid;
  gap: 20px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: rgba(19, 181, 234, 0.25);
}

.timeline-item {
  position: relative;
  display: flex;
  gap: 18px;
  padding-left: 8px;
}

.timeline-item span {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), #0e7698);
  font-weight: bold;
  z-index: 1;
}

.tabs {
  margin-top: 10px;
}

.tab-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.tab-btn {
  background: rgba(255,255,255,0.04);
  color: var(--muted);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  transition: 0.25s ease;
}

.tab-btn.active,
.tab-btn:hover {
  background: rgba(19, 181, 234, 0.14);
  color: var(--white);
  border-color: rgba(19, 181, 234, 0.3);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.accordion {
  display: grid;
  gap: 14px;
}

.accordion-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 18px;
  overflow: hidden;
}

.accordion-header {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  color: var(--white);
  padding: 18px 20px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
}

.accordion-body {
  display: none;
  padding: 0 20px 18px;
  color: var(--muted);
}

.accordion-item.active .accordion-body {
  display: block;
}

.cta-section {
  padding-top: 30px;
}

.cta-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 32px;
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(19,181,234,0.12), rgba(255,255,255,0.04));
  border: 1px solid rgba(19,181,234,0.16);
  box-shadow: var(--shadow);
}

.contact-card label {
  display: block;
  font-weight: bold;
  margin-bottom: 16px;
}

.contact-card input,
.contact-card textarea {
  width: 100%;
  margin-top: 8px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  color: var(--white);
  border-radius: 14px;
  padding: 14px 16px;
  outline: none;
}

.contact-card input::placeholder,
.contact-card textarea::placeholder {
  color: #9fb0be;
}

.copy-feedback {
  margin-top: 14px;
  color: var(--primary-2);
  min-height: 24px;
}

.site-footer {
  padding: 38px 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  background: rgba(0,0,0,0.2);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.7fr 0.9fr;
  gap: 24px;
}

.site-footer h3,
.site-footer h4 {
  margin-bottom: 10px;
}

.site-footer p,
.site-footer li,
.site-footer a {
  color: var(--muted);
}

.site-footer li + li {
  margin-top: 8px;
}

.back-to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(10, 18, 28, 0.9);
  color: var(--white);
  cursor: pointer;
  display: none;
  z-index: 999;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: 0.8s ease;
}

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

.tilt-card {
  transform-style: preserve-3d;
  transition: transform 0.2s ease;
}

@media (max-width: 980px) {
  .grid-2,
  .feature-grid,
  .product-grid,
  .footer-grid,
  .cta-box {
    grid-template-columns: 1fr;
  }

  .cta-box {
    align-items: flex-start;
  }

  .main-nav {
    position: absolute;
    top: calc(var(--header-height) + 8px);
    right: 16px;
    left: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
    border-radius: 20px;
    background: rgba(6, 12, 19, 0.96);
    border: 1px solid rgba(255,255,255,0.08);
  }

  .main-nav.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 70px 0;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-content {
    padding: 60px 0;
  }

  .btn {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }

  .brand strong {
    font-size: 0.95rem;
  }

  .brand span {
    font-size: 0.8rem;
  }
}