:root {
  --bg: #f4f9fc;
  --surface: #ffffff;
  --surface-alt: #e7f3f9;
  --text: #153440;
  --muted: #456472;
  --primary: #1e718f;
  --primary-dark: #14566d;
  --ring: #95cde3;
  --radius: 16px;
  --shadow: 0 12px 30px rgba(21, 52, 64, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

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

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

.lead {
  font-size: 1.08rem;
  color: var(--muted);
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--surface);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.site-header {
  background: linear-gradient(145deg, #deeff8, #f4f9fc 45%, #d4ebf6);
  border-bottom: 1px solid #d6e8f2;
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
  flex-wrap: wrap;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  padding: 11px;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid #bcdbe9;
  background: rgba(255, 255, 255, 0.6);
}

.nav-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background: var(--primary-dark);
  border-radius: 3px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.nav-toggle-cb:checked ~ .nav-toggle span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle-cb:checked ~ .nav-toggle span:nth-child(2) {
  opacity: 0;
}

.nav-toggle-cb:checked ~ .nav-toggle span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.logo {
  text-decoration: none;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 0.3px;
  font-size: 1.1rem;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
}

.nav-list a {
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  color: #1c4959;
}

.nav-list a.active {
  color: var(--primary-dark);
  border-bottom: 2px solid var(--primary-dark);
}

.hero {
  padding: 4rem 0 3.8rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.8rem;
  align-items: center;
}

.hero-image {
  width: 100%;
  border-radius: 18px;
  box-shadow: var(--shadow);
  border: 1px solid #cde0e9;
}

.badge {
  display: inline-block;
  background: #d8eef8;
  color: #0f4c62;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.85rem;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin-top: 0;
}

h1 {
  margin: 1rem 0;
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  max-width: 16ch;
}

.hero p {
  max-width: 58ch;
}

.btn {
  display: inline-block;
  margin-top: 1.25rem;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  padding: 0.8rem 1rem;
  border-radius: 10px;
  font-weight: 700;
}

.btn:hover {
  background: var(--primary-dark);
  color: #fff;
}

.btn.secondary {
  background: transparent;
  color: var(--primary-dark);
  border: 1px solid #8ac2d9;
}

.section {
  padding: 3.25rem 1.5rem;
  margin-top: 1.25rem;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.section-alt {
  background: var(--surface-alt);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.grid article {
  background: #fff;
  border: 1px solid #cde2ec;
  border-radius: 12px;
  padding: 1rem;
}

.feature-image {
  width: 100%;
  border-radius: 12px;
  border: 1px solid #cde2ec;
  box-shadow: var(--shadow);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}

.cards article {
  padding: 1rem;
  border-radius: 12px;
  background: #fff;
  border: 1px solid #d5e8f1;
}

.cards h3 {
  margin-bottom: 0.45rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
  align-items: start;
}

.page-intro {
  padding: 2.4rem 0 1.7rem;
}

.pill-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.pill-list li {
  background: #e1f0f8;
  color: #13465c;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.88rem;
  font-weight: 600;
}

.link-list {
  padding-left: 1.1rem;
}

details {
  background: #fff;
  border: 1px solid #cde2ec;
  border-radius: 10px;
  padding: 0.8rem 1rem;
  margin-bottom: 0.75rem;
}

summary {
  cursor: pointer;
  font-weight: 700;
}

.site-footer {
  margin-top: 2rem;
  padding: 2.5rem 0 3rem;
  background: #10323f;
  color: #ecf7fc;
}

.site-footer h2 {
  color: #ffffff;
}

.site-footer a {
  color: #9bd4ea;
}

.site-footer nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.stories {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.story {
  background: #fff;
  border: 1px solid #d5e8f1;
  border-left: 5px solid var(--primary);
  border-radius: 12px;
  padding: 1.25rem 1.4rem;
}

.story h3 {
  margin-bottom: 0.5rem;
  color: var(--primary-dark);
}

.story p {
  margin: 0;
}

.breadcrumbs {
  padding: 1rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.breadcrumbs ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
}

.breadcrumbs li:not(:last-child)::after {
  content: "»";
  margin-left: 0.5rem;
  color: #a0b9c6;
}

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

.breadcrumbs a:hover {
  text-decoration: underline;
}

.author-section {
  background: #fff;
  border: 1px solid #d5e8f1;
  border-radius: 16px;
  padding: 2rem;
  margin-top: 3rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
  box-shadow: var(--shadow);
}

.author-avatar {
  width: 80px;
  height: 80px;
  background: #e1f0f8;
  color: #1e718f;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  flex-shrink: 0;
}

.author-info h3 {
  margin: 0 0 0.5rem 0;
}

.author-info p {
  margin: 0;
  font-size: 0.95rem;
}

.small {
  font-size: 0.92rem;
  opacity: 0.95;
}

a:focus,
button:focus,
summary:focus {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
}

@media (max-width: 800px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    flex-basis: 100%;
    display: none;
  }

  .nav-toggle-cb:checked ~ .main-nav {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    padding-top: 0.5rem;
  }

  .nav-list li {
    border-top: 1px solid #d6e8f2;
  }

  .nav-list a {
    display: block;
    padding: 0.85rem 0.25rem;
    font-size: 1rem;
  }

  .nav-list a.active {
    border-bottom: none;
  }

  .author-section {
    flex-direction: column;
    text-align: center;
  }

  .hero-grid,
  .split {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2rem;
  }
}