/* ===== CSS Variables & Theme ===== */
:root {
  --color-primary: #32a7ef;
  --color-primary-hover: #0184d6;
  --color-secondary: #0184d6;
  --color-dark-bg: #0b1120;
  --color-light-bg: #f8fafc;
  --color-card-bg: #ffffff;
  --color-text-dark: #1e293b;
  --color-text-light: #e2e8f0;
  --color-muted: #64748b;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --nav-height: 72px;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.06);
  --transition: 0.2s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-dark);
  background: var(--color-light-bg);
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 200;
  padding: 0.75rem 1rem;
  background: var(--color-primary);
  color: white;
  font-weight: 600;
  border-radius: var(--radius);
  transition: top var(--transition);
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid white;
  outline-offset: 2px;
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-weight: 600;
  line-height: 1.25;
}

h1 { font-size: clamp(2.5rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }

p {
  margin: 0 0 1em;
}

p:last-child {
  margin-bottom: 0;
}

/* ===== Layout utilities ===== */
/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 1.5rem;
  background: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition);
}

.nav.scrolled {
  background: rgba(11, 17, 32, 0.95);
}

.nav__logo {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-light);
}

.nav__logo:hover {
  color: white;
}

.nav__logo-img {
  display: block;
  height: 70px;
  width: auto;
  object-fit: contain;
  filter: brightness(1.25) contrast(1.1);
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--color-text-light);
  transition: color var(--transition);
}

.nav__toggle:hover,
.nav__toggle[aria-expanded="true"] {
  color: white;
}

.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav__links {
  display: none;
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  flex-direction: column;
  gap: 0;
  padding: 1rem;
  background: var(--color-dark-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.nav__links.open {
  display: flex;
}

.nav__link {
  padding: 0.75rem 1rem;
  color: var(--color-text-light);
  border-radius: var(--radius);
}

.nav__link:hover {
  color: var(--color-primary);
  background: rgba(50, 167, 239, 0.08);
}

.nav__link.active {
  color: var(--color-primary);
  font-weight: 500;
  box-shadow: inset 0 -2px 0 0 var(--color-primary);
}

@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }

  .nav__links {
    display: flex;
    position: static;
    flex-direction: row;
    gap: 0.25rem;
    padding: 0;
    background: transparent;
    border: none;
  }

  .nav__link {
    padding: 0.5rem 1rem;
  }
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-dark-bg);
  /* Swap with your own image: url('images/hero-bg.jpg') */
  background-image: url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?w=1920&q=80');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(11, 17, 32, 0.80) 0%,
    rgba(11, 17, 32, 0.80) 50%,
    rgba(11, 17, 32, 0.80) 100%
  );
  /* Extra dark layer so logo and text stand out over the Earth image */
  /* box-shadow: inset 0 0 0 1000px rgba(11, 17, 32, 0.35); */
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem 1.5rem;
  max-width: 720px;
}

.hero__logo {
  display: block;
  width: 100%;
  max-width: 640px;
  height: auto;
  margin: 0 auto 1.5rem;
  object-fit: contain;
}

.hero__title {
  margin-bottom: 0.5rem;
  color: white;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero__slogan {
  margin-bottom: 2rem;
  font-size: clamp(1.125rem, 2vw, 1.35rem);
  color: var(--color-text-light);
  font-weight: 500;
}

.hero__cta {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  background: var(--color-primary);
  color: white;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.hero__cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px) scale(1.02);
}

.hero__cta:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== Intro ===== */
.intro {
  padding: 4rem 1.5rem;
  background: var(--color-light-bg);
}

.intro__container {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.intro__heading {
  margin-bottom: 1rem;
  color: var(--color-text-dark);
}

.intro__text {
  font-size: 1.125rem;
  color: var(--color-text-dark);
  margin: 0;
}

/* ===== Products ===== */
.products {
  padding: 4rem 1.5rem;
  background: #f1f5f9;
}

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

.products__heading {
  text-align: center;
  margin-bottom: 0.25rem;
  color: var(--color-text-dark);
}

.products__subheading {
  text-align: center;
  font-size: 1.25rem;
  color: var(--color-muted);
  margin: 0 0 3rem;
  font-weight: 500;
}

.products__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.product-card {
  background: var(--color-card-bg);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: box-shadow var(--transition), opacity 0.5s ease, transform 0.5s ease;
  opacity: 0;
  transform: translateY(24px);
}

.product-card.visible {
  animation: cardFadeIn 0.5s ease forwards;
}

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.product-card:hover {
  box-shadow: var(--shadow-lg);
}

.product-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  color: var(--color-primary);
}

.product-card__icon svg {
  flex-shrink: 0;
}

.product-card__title {
  margin-bottom: 0.5rem;
  color: var(--color-text-dark);
}

.product-card__desc {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.5;
}

@media (min-width: 768px) {
  .products__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .products__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .products__grid .product-card:nth-child(4),
  .products__grid .product-card:nth-child(5) {
    grid-column: span 1;
  }
}

/* ===== Contact ===== */
.contact {
  padding: 4rem 1.5rem;
  background: var(--color-light-bg);
}

.contact__container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: start;
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact__label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-dark);
}

.contact__input {
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius);
  background: var(--color-card-bg);
  color: var(--color-text-dark);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.contact__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(50, 167, 239, 0.15);
}

.contact__textarea {
  resize: vertical;
  min-height: 120px;
}

.contact__submit {
  padding: 0.875rem 1.75rem;
  background: var(--color-primary);
  color: white;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  border-radius: var(--radius);
  transition: background var(--transition), transform var(--transition);
}

.contact__submit:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px) scale(1.02);
}

.contact__submit:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.contact__info {
  padding: 0 0.25rem;
}

.contact__blurb {
  margin-bottom: 1.5rem;
  color: var(--color-text-dark);
  font-size: 1.0625rem;
}

.contact__detail {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  color: var(--color-text-dark);
  font-weight: 500;
}

.contact__detail:hover {
  color: var(--color-primary);
}

.contact__detail svg {
  flex-shrink: 0;
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .contact__container {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== Footer ===== */
.footer {
  padding: 2rem 1.5rem;
  background: var(--color-dark-bg);
  text-align: center;
}

.footer__copy {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-muted);
}