*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body {
  margin: 0;
  font-family: "Open Sans", Arial, sans-serif;
  color: #333;
  background: #f7f9fc;
  line-height: 1.6;
}

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

a {
  color: #1676c2;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(1080px, 92%);
  margin: 0 auto;
}

/* Header */
.site-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid #e9eef5;
  padding: 1.25rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo img {
  max-height: 72px;
  width: auto;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
}

.site-nav a {
  color: #333;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: #1676c2;
}

/* Hero */
.hero {
  padding: 4rem 0 2rem;
  text-align: center;
  background:
    radial-gradient(circle at top left, rgba(46, 163, 242, 0.18), transparent 36rem),
    linear-gradient(180deg, #fff 0%, #f7f9fc 100%);
}

.hero h1 {
  max-width: 760px;
  margin: 0 auto 1rem;
  font-size: clamp(2rem, 5vw, 3.75rem);
  line-height: 1.08;
  font-weight: 800;
  color: #333;
}

.hero-intro {
  max-width: 680px;
  margin: 0 auto 1.5rem;
  color: #4f5f70;
  font-size: 1.1rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: #1676c2;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 0 0 2rem;
}

.button-primary,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.75rem 1.15rem;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
}

.button-primary {
  color: #fff;
  background: #1676c2;
  box-shadow: 0 12px 30px rgba(22, 118, 194, 0.24);
}

.button-secondary {
  color: #1676c2;
  background: #fff;
  border: 1px solid #d8e7f5;
}

.button-primary:hover,
.button-secondary:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.ad-slot {
  margin: 0 auto 1rem;
  min-height: 90px;
}

/* Quick Links */
.quick-links {
  padding: 2.5rem 0 1rem;
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.quick-card {
  display: grid;
  gap: 0.35rem;
  padding: 1.15rem;
  min-height: 120px;
  align-content: center;
  background: #fff;
  border: 1px solid #e5ebf2;
  border-radius: 18px;
  color: #25364a;
  box-shadow: 0 12px 30px rgba(24, 44, 68, 0.07);
}

.quick-card:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.quick-card span {
  color: #1676c2;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* Categories */
.categories {
  padding: 3rem 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 1.75rem;
}

.section-heading h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  line-height: 1.15;
}

.section-heading p {
  margin: 0;
  color: #5d6a78;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.category-card {
  background: #fff;
  border: 1px solid #e5ebf2;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(24, 44, 68, 0.08);
}

.category-card h3 {
  margin: 1rem 1rem 0.35rem;
  font-size: 1.2rem;
  line-height: 1.25;
}

.category-card p {
  margin: 0 1rem 1.15rem;
  font-size: 0.95rem;
}

.category-card a.image-link {
  display: block;
  overflow: hidden;
  line-height: 0;
}

.category-card a.image-link img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.25s ease;
}

.category-card a.image-link:hover img {
  transform: scale(1.03);
}

.category-card a.image-link:focus-visible {
  outline: 2px solid #1676c2;
  outline-offset: 2px;
}

/* Summary */
.summary {
  padding: 0 0 3rem;
}

.summary .container {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 2rem;
  align-items: center;
  padding: 2rem;
  background: #fff;
  border: 1px solid #e5ebf2;
  border-radius: 22px;
  box-shadow: 0 16px 40px rgba(24, 44, 68, 0.08);
}

.summary h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.18;
}

.summary p {
  margin: 0 0 1rem;
  color: #4f5f70;
}

/* FAQ */
.faq {
  padding: 0 0 3rem;
}

.faq-grid {
  display: grid;
  gap: 0.85rem;
}

.faq details {
  background: #fff;
  border: 1px solid #e5ebf2;
  border-radius: 16px;
  padding: 1rem 1.15rem;
  box-shadow: 0 10px 28px rgba(24, 44, 68, 0.06);
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  color: #25364a;
}

.faq p {
  margin: 0.75rem 0 0;
  color: #4f5f70;
}

/* Footer */
.site-footer {
  border-top: 1px solid #eee;
  padding: 1.5rem 0 2rem;
  text-align: center;
  font-size: 0.9rem;
  color: #666;
}

@media (max-width: 768px) {
  html {
    scroll-padding-top: 170px;
  }

  .site-header .container {
    flex-direction: column;
    text-align: center;
  }

  .category-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .quick-grid {
    grid-template-columns: 1fr;
  }

  .summary .container {
    grid-template-columns: 1fr;
    padding: 1.5rem;
  }
}