/*
Theme Name: Ballnikk
Theme URI: https://100ballnikk.ru
Author: 100ballnikk.ru
Description: Лёгкая минималистичная тема для образовательного портала 100ballnikk.ru. Без тяжёлых фреймворков и сторонних шрифтов.
Version: 1.0.0
Requires PHP: 8.0
Text Domain: ballnikk
*/

/* ---------- Variables ---------- */
:root {
  --color-bg: #ffffff;
  --color-text: #1c1f26;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-accent: #2563eb;
  --color-accent-dark: #1d4ed8;
  --color-surface: #f8f9fb;
  --max-width: 1100px;
  --content-width: 720px;
  --radius: 8px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { padding-left: 1.25em; }
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; margin: 1.4em 0 0.6em; }
h1 { font-size: 2rem; margin-top: 0; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}
.skip-link {
  position: absolute;
  left: -9999px;
  background: var(--color-accent);
  color: #fff;
  padding: 10px 16px;
  z-index: 1000;
}
.skip-link:focus { left: 10px; top: 10px; }

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}
.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  gap: 20px;
}
.site-branding { display: flex; flex-direction: column; }
.site-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}
.site-title a { color: inherit; }
.site-title a:hover { text-decoration: none; color: var(--color-accent); }
.site-description {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-top: 2px;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-size: 1rem;
  cursor: pointer;
}

.primary-navigation ul {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
.primary-navigation a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: var(--radius);
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
}
.primary-navigation a:hover {
  background: var(--color-surface);
  text-decoration: none;
  color: var(--color-accent);
}
.primary-navigation .current-menu-item > a {
  color: var(--color-accent);
}

/* ---------- Main layout ---------- */
.site-main { padding: 32px 0 56px; }
.page-title {
  font-size: 1.6rem;
  margin-bottom: 6px;
}
.archive-description {
  color: var(--color-muted);
  margin-bottom: 24px;
}

/* ---------- Post cards ---------- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
}
.post-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  transition: box-shadow .15s ease, transform .15s ease;
}
.post-card:hover {
  box-shadow: 0 4px 14px rgba(0,0,0,.07);
}
.post-card-thumb {
  aspect-ratio: 16/10;
  background: var(--color-surface);
  overflow: hidden;
}
.post-card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.post-card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.post-card-meta {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: 8px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}
.post-card-category {
  display: inline-block;
  background: var(--color-surface);
  color: var(--color-accent-dark);
  border-radius: 999px;
  padding: 2px 10px;
  font-weight: 600;
  font-size: 0.75rem;
}
.post-card-title {
  font-size: 1.1rem;
  margin: 0 0 8px;
  line-height: 1.35;
}
.post-card-title a { color: var(--color-text); }
.post-card-title a:hover { color: var(--color-accent); text-decoration: none; }
.post-card-excerpt {
  color: var(--color-muted);
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 12px;
}
.post-card-more {
  font-weight: 600;
  font-size: 0.9rem;
}

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 24px;
  flex-wrap: wrap;
}
.pagination a, .pagination span {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--color-text);
}
.pagination a:hover { border-color: var(--color-accent); color: var(--color-accent); text-decoration: none; }
.pagination .current {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  font-weight: 600;
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 18px;
}
.breadcrumbs a { color: var(--color-muted); }
.breadcrumbs a:hover { color: var(--color-accent); }
.breadcrumbs .sep { margin: 0 6px; }

/* ---------- Single article ---------- */
.article-header {
  max-width: var(--content-width);
  margin: 0 auto 24px;
}
.article-category a {
  display: inline-block;
  background: var(--color-surface);
  color: var(--color-accent-dark);
  border-radius: 999px;
  padding: 3px 12px;
  font-weight: 600;
  font-size: 0.78rem;
  margin-bottom: 12px;
}
.article-title {
  font-size: 2rem;
  margin: 0 0 12px;
}
.article-meta {
  color: var(--color-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.article-meta .meta-sep { color: var(--color-border); }
.article-thumb {
  max-width: var(--content-width);
  margin: 0 auto 28px;
  border-radius: var(--radius);
  overflow: hidden;
}
.article-body {
  max-width: var(--content-width);
  margin: 0 auto;
  font-size: 1.08rem;
}
.article-body img {
  border-radius: var(--radius);
  margin: 1em 0;
}
.article-body h2 { margin-top: 1.6em; }
.article-body h3 { margin-top: 1.3em; }
.article-body blockquote {
  border-left: 4px solid var(--color-accent);
  margin: 1.5em 0;
  padding: 0.2em 1.2em;
  color: var(--color-muted);
  background: var(--color-surface);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.article-body pre {
  background: var(--color-surface);
  padding: 14px;
  border-radius: var(--radius);
  overflow-x: auto;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
}
.article-body table th, .article-body table td {
  border: 1px solid var(--color-border);
  padding: 8px 10px;
  text-align: left;
}

/* Table of contents */
.toc {
  max-width: var(--content-width);
  margin: 0 auto 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  background: var(--color-surface);
}
.toc-title {
  font-weight: 700;
  margin-bottom: 8px;
  font-size: 0.95rem;
}
.toc ol {
  margin: 0;
  padding-left: 1.2em;
  font-size: 0.92rem;
}
.toc li { margin-bottom: 4px; }
.toc a { color: var(--color-text); }
.toc a:hover { color: var(--color-accent); }

/* Post navigation (prev/next) */
.post-navigation {
  max-width: var(--content-width);
  margin: 40px auto 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
}
.post-navigation .nav-next { text-align: right; }
.post-navigation a {
  display: block;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  color: var(--color-text);
}
.post-navigation a:hover { border-color: var(--color-accent); text-decoration: none; }
.post-navigation .nav-label {
  display: block;
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-bottom: 4px;
}
.post-navigation .nav-title { font-weight: 600; font-size: 0.95rem; }

/* Related posts */
.related-posts {
  max-width: var(--max-width);
  margin: 48px auto 0;
  padding: 0 20px;
}
.related-posts-title {
  font-size: 1.3rem;
  margin-bottom: 16px;
  text-align: center;
}

/* ---------- Page content ---------- */
.page-content {
  max-width: var(--content-width);
  margin: 0 auto;
  font-size: 1.08rem;
}

/* ---------- Category list page ---------- */
.category-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--content-width);
}
.category-list li {
  border-bottom: 1px solid var(--color-border);
}
.category-list a {
  display: flex;
  justify-content: space-between;
  padding: 14px 4px;
  color: var(--color-text);
  font-weight: 600;
}
.category-list a:hover { color: var(--color-accent); text-decoration: none; }
.category-list .count { color: var(--color-muted); font-weight: 400; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
  margin-top: 40px;
}
.site-footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--color-muted);
}
.footer-nav ul {
  list-style: none;
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0;
}
.footer-nav a { color: var(--color-muted); }
.footer-nav a:hover { color: var(--color-accent); }

/* ---------- No posts ---------- */
.no-results {
  max-width: var(--content-width);
  margin: 0 auto;
  text-align: center;
  padding: 40px 0;
  color: var(--color-muted);
}

/* ---------- Search form ---------- */
.search-form {
  display: flex;
  gap: 8px;
  max-width: var(--content-width);
  margin: 0 auto 24px;
}
.search-form input[type="search"] {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
}
.search-form button {
  padding: 10px 18px;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  cursor: pointer;
}
.search-form button:hover { background: var(--color-accent-dark); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .post-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  .menu-toggle { display: inline-flex; align-items: center; gap: 6px; }
  .primary-navigation {
    display: none;
    width: 100%;
    order: 3;
  }
  .primary-navigation.is-open { display: block; }
  .primary-navigation ul { flex-direction: column; gap: 0; }
  .primary-navigation a { display: block; padding: 12px 4px; border-bottom: 1px solid var(--color-border); }
  .site-header-inner { flex-wrap: wrap; }
  .post-grid { grid-template-columns: 1fr; }
  .post-navigation { grid-template-columns: 1fr; }
  .post-navigation .nav-next { text-align: left; }
  .article-title { font-size: 1.5rem; }
  body { font-size: 16px; }
}