:root {
  --blue: #1e3a8a;
  --ink: #111827;
  --muted: #6b7280;
  --soft: #f3f4f6;
  --accent: #10b981;
  --line: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background: #fff;
}

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

a:hover {
  color: #132a66;
}

.navbar {
  min-height: 68px;
}

.navbar-brand,
.footer-brand {
  color: var(--blue);
  letter-spacing: 0;
}

.site-main {
  padding-top: 68px;
}

.hero-section {
  padding: 72px 0 48px;
  background: linear-gradient(180deg, #fff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--line);
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 4.2rem);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: 0;
  margin-bottom: 1rem;
}

.hero-content p {
  color: var(--muted);
  font-size: 1.15rem;
  margin: 0 auto 2rem;
  max-width: 680px;
}

.search-large {
  display: flex;
  gap: .75rem;
  width: min(760px, 100%);
  margin: 0 auto;
  padding: .6rem;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 20px 60px rgba(17, 24, 39, .08);
}

.search-large input {
  flex: 1;
  border: 0;
  outline: 0;
  padding: .95rem 1rem;
  min-width: 0;
}

.search-large button,
.btn-primary {
  background: var(--blue);
  border-color: var(--blue);
}

.search-large button {
  color: #fff;
  border: 0;
  padding: .8rem 1.4rem;
  font-weight: 700;
}

.search-large.compact {
  margin: 1.25rem 0 0;
  box-shadow: none;
}

.section-block {
  padding-top: 48px;
}

.narrow {
  max-width: 860px;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.section-heading h2,
.category-header h1,
.article-header h1,
.admin-main h1 {
  font-weight: 800;
  letter-spacing: 0;
}

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

.category-card,
.article-card,
.featured-article,
.sidebar-box,
.toc-box,
.admin-panel,
.stats-grid > div,
.login-panel,
.install-card {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
}

.category-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  color: var(--ink);
}

.category-card span {
  font-weight: 700;
}

.category-card small,
.text-muted {
  color: var(--muted) !important;
}

.article-card {
  padding: 1.2rem;
}

.article-card h2,
.article-card h3 {
  font-size: 1.2rem;
  line-height: 1.35;
  margin: .35rem 0 .65rem;
  letter-spacing: 0;
}

.article-card p,
.result-item p {
  color: var(--muted);
  margin-bottom: 0;
}

.tag,
.eyebrow {
  display: inline-flex;
  color: var(--accent);
  font-weight: 800;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.featured-article {
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  background: #f9fafb;
}

.featured-article h2 {
  font-size: 1.6rem;
  margin: .3rem 0 .5rem;
  letter-spacing: 0;
}

.popular-list,
.letter-nav,
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
}

.popular-list a,
.letter-nav a {
  border: 1px solid var(--line);
  padding: .45rem .75rem;
  color: var(--ink);
  background: #fff;
}

.letter-nav {
  margin: 1rem 0 1.5rem;
}

.letter-nav a.active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}

.site-footer {
  background: #f9fafb;
}

.footer-links {
  justify-content: flex-start;
}

.footer-links a {
  color: var(--ink);
}

.article-layout {
  padding-top: 42px;
}

.breadcrumbs {
  display: flex;
  gap: .45rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: .92rem;
  margin-bottom: 1.25rem;
}

.article-header {
  margin-bottom: 1.5rem;
}

.article-header h1 {
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.1;
}

.lead-summary {
  font-size: 1.16rem;
  color: #374151;
  border-left: 4px solid var(--accent);
  padding-left: 1rem;
  margin: 1rem 0;
}

.article-meta {
  color: var(--muted);
  font-size: .95rem;
}

.toc-box,
.sidebar-box {
  padding: 1.1rem;
  margin-bottom: 1.25rem;
}

.toc-box ol {
  margin: .75rem 0 0;
}

.toc-sub {
  margin-left: 1rem;
}

.article-content {
  font-size: 1.05rem;
}

.article-content h2 {
  font-size: 1.8rem;
  margin: 2rem 0 .75rem;
  letter-spacing: 0;
}

.article-content h3 {
  font-size: 1.35rem;
  margin: 1.4rem 0 .5rem;
  letter-spacing: 0;
}

.article-content p,
.article-content li {
  color: #243041;
}

.article-content a {
  font-weight: 700;
}

.ai-notice {
  margin-top: 2rem;
  padding: 1rem;
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
  border-radius: 8px;
}

.related-link {
  display: block;
  padding: .8rem 0;
  border-bottom: 1px solid var(--line);
}

.related-link span {
  display: block;
  color: var(--muted);
  font-size: .92rem;
}

.ad-slot {
  min-height: 90px;
  border: 1px dashed #cbd5e1;
  background: #f8fafc;
  color: #64748b;
  display: grid;
  place-items: center;
  text-align: center;
  border-radius: 8px;
  padding: 1rem;
}

.empty-state {
  padding: 1.2rem;
  background: var(--soft);
  border-radius: 8px;
  color: var(--muted);
}

.result-item {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.result-item h2 {
  font-size: 1.25rem;
  letter-spacing: 0;
}

.install-body,
.admin-login {
  background: #f8fafc;
}

.install-card,
.login-panel {
  width: min(760px, 100%);
  padding: 2rem;
  box-shadow: 0 20px 80px rgba(17, 24, 39, .08);
}

.login-panel {
  width: min(420px, calc(100% - 2rem));
  margin: 8vh auto;
}

.admin-body {
  background: #f8fafc;
}

.admin-nav {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}

.admin-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.admin-links a {
  color: var(--ink);
  font-weight: 600;
}

.admin-main {
  padding-top: 2rem;
  padding-bottom: 4rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.5rem;
}

.stats-grid > div,
.admin-panel {
  padding: 1.2rem;
}

.stats-grid strong {
  display: block;
  font-size: 2rem;
  color: var(--blue);
}

.stats-grid span,
.log-item small,
.pending-word small {
  color: var(--muted);
}

.admin-panel h2 {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 0;
  margin-bottom: 1rem;
}

.log-item,
.pending-word {
  display: grid;
  gap: .15rem;
  padding: .7rem 0;
  border-bottom: 1px solid var(--line);
}

.admin-search {
  display: flex;
  gap: .75rem;
  margin: 1rem 0;
}

.table-actions {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}

.table-actions form {
  margin: 0;
}

.code-editor {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: .95rem;
}

@media (max-width: 720px) {
  .hero-section {
    padding: 42px 0 32px;
  }

  .search-large,
  .featured-article,
  .admin-search {
    flex-direction: column;
  }

  .search-large button {
    width: 100%;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .admin-links {
    gap: .65rem;
    font-size: .92rem;
  }
}