:root {
  --bg: #f7fafb;
  --surface: #ffffff;
  --ink: #1d2730;
  --muted: #5d6b78;
  --primary: #2a6f97;
  --primary-dark: #1e5575;
  --accent: #6a7f4e;
  --line: #d9e2e7;
  --soft: #edf4f7;
  --warning-soft: #fff8e7;
  --shadow: 0 8px 24px rgba(30, 55, 70, 0.08);
  --radius: 8px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
}

a { color: var(--primary-dark); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

img, svg { max-width: 100%; }

.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 12px;
  background: var(--ink);
  color: #fff;
  padding: 10px 14px;
  z-index: 20;
}

.skip-link:focus { left: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.navbar {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.15;
}

.logo-mark {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  letter-spacing: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 17px;
  font-weight: 700;
}

.nav-toggle { display: none; }

.hero {
  padding: 76px 0 58px;
  background: linear-gradient(180deg, #eef6f8 0%, #f7fafb 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.7fr);
  gap: 44px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 15px;
  text-transform: uppercase;
  font-weight: 800;
}

h1, h2, h3 {
  line-height: 1.2;
  letter-spacing: 0;
  margin: 0 0 14px;
}

h1 { font-size: 54px; max-width: 850px; }
h2 { font-size: 34px; }
h3 { font-size: 23px; }

.hero-text {
  max-width: 760px;
  font-size: 22px;
  color: var(--muted);
}

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

.button, button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  font-size: 17px;
  cursor: pointer;
}

.button:hover, button:hover { background: var(--primary-dark); text-decoration: none; }
.button.secondary { background: #fff; color: var(--primary-dark); }
.button.small { min-height: 42px; padding: 9px 15px; white-space: nowrap; }

.hero-panel, .widget, .contact-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
}

.check-list { padding-left: 22px; margin-bottom: 0; }
.check-list li { margin: 8px 0; }

.intro-section, .section { padding: 56px 0; }
.content-narrow { max-width: 820px; }

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.card-grid {
  display: grid;
  gap: 22px;
}

.card-grid.three { grid-template-columns: repeat(3, 1fr); }
.card-grid.two { grid-template-columns: repeat(2, 1fr); }

.post-card, .category-detail-grid article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.category-label {
  display: inline-block;
  color: var(--primary-dark);
  background: var(--soft);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 14px;
  font-weight: 800;
  margin-bottom: 12px;
}

.post-meta {
  color: var(--muted);
  font-size: 15px;
  margin: 12px 0;
}

.read-more, .text-link {
  font-weight: 800;
}

.ad-slot {
  min-height: 96px;
  display: grid;
  place-items: center;
  border: 1px dashed #b9c8d1;
  border-radius: var(--radius);
  background: #f2f6f8;
  color: #6c7882;
  font-size: 14px;
  text-transform: uppercase;
  font-weight: 700;
}

.ad-slot.inline { margin: 28px 0; }
.sidebar-ad { min-height: 250px; }

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.category-grid a {
  display: block;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-weight: 800;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 34px;
  align-items: start;
}

.post-list {
  display: grid;
  gap: 18px;
}

.post-row {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.sidebar {
  display: grid;
  gap: 20px;
  position: sticky;
  top: 98px;
}

.link-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.link-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.search-form {
  display: flex;
  gap: 8px;
}

input, select, textarea {
  width: 100%;
  min-height: 48px;
  border: 1px solid #b8c7d0;
  border-radius: var(--radius);
  padding: 11px 13px;
  font: inherit;
  background: #fff;
  color: var(--ink);
}

textarea { resize: vertical; }

.blog-search { max-width: 760px; margin-bottom: 30px; }

.faq-section {
  padding: 58px 0;
  background: #fff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 900px;
}

details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
}

summary {
  cursor: pointer;
  font-weight: 800;
}

.newsletter {
  padding: 46px 0;
  background: var(--primary-dark);
  color: #fff;
}

.newsletter-inner {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: center;
}

.newsletter p { color: #eaf3f6; margin-bottom: 0; }
.newsletter-form { display: flex; gap: 8px; min-width: 420px; }
.newsletter-form button { background: #0f2d3d; border-color: #0f2d3d; }

.page-main { padding: 34px 0 70px; }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 24px;
}

.breadcrumbs a::after {
  content: "/";
  color: var(--muted);
  margin-left: 8px;
}

.page-header {
  max-width: 850px;
  margin-bottom: 34px;
}

.page-header p { color: var(--muted); font-size: 21px; }

.article-content {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 38px;
}

.article-header h1 { font-size: 48px; }
.article-summary { color: var(--muted); font-size: 22px; }
.article-content section { margin-top: 34px; }
.article-content li { margin: 8px 0; }

.toc {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  margin: 28px 0;
}

.toc h2 { font-size: 24px; }

.article-faq, .related-posts {
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.category-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.prose-page {
  max-width: 860px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 38px;
}

.prose-page h1 { font-size: 46px; }
.prose-page h2 { font-size: 28px; margin-top: 30px; }

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 30px;
}

.contact-form {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  display: grid;
  gap: 10px;
}

.contact-form label { font-weight: 800; }
.form-note { color: var(--muted); font-size: 15px; margin-bottom: 0; }

.pagination {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}

.pagination a {
  min-width: 42px;
  min-height: 42px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  font-weight: 800;
}

.pagination .active {
  background: var(--primary);
  color: #fff;
}

.site-footer {
  background: #1f2d35;
  color: #e8f0f3;
  padding: 46px 0 22px;
}

.site-footer a { color: #e8f0f3; display: block; margin: 8px 0; }
.footer-logo { margin-bottom: 12px; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.7fr 0.9fr;
  gap: 40px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  margin-top: 28px;
  padding-top: 18px;
  color: #c7d4da;
  font-size: 15px;
}

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

@media (max-width: 900px) {
  body { font-size: 17px; }
  h1, .article-header h1 { font-size: 40px; }
  h2 { font-size: 29px; }
  .hero-grid, .content-layout, .contact-layout, .footer-grid { grid-template-columns: 1fr; }
  .card-grid.three, .card-grid.two, .category-detail-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .sidebar { position: static; }
  .newsletter-inner { align-items: stretch; flex-direction: column; }
  .newsletter-form { min-width: 0; }
  .nav-toggle {
    display: inline-flex;
    width: auto;
    min-height: 42px;
    padding: 8px 14px;
  }
  .nav-menu {
    display: none;
    position: absolute;
    left: 20px;
    right: 20px;
    top: 78px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
  }
  .nav-menu.is-open {
    display: grid;
    gap: 10px;
  }
}

@media (max-width: 560px) {
  .container { width: min(100% - 28px, 1160px); }
  h1, .article-header h1, .prose-page h1 { font-size: 34px; }
  .hero { padding: 48px 0; }
  .hero-text, .page-header p, .article-summary { font-size: 19px; }
  .post-row, .section-heading, .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
  .search-form, .newsletter-form { flex-direction: column; }
  .category-grid { grid-template-columns: 1fr; }
  .article-content, .prose-page { padding: 24px; }
}