/*
Theme Name: EchoBlog
Theme URI: https://example.com
Author: Codex
Author URI: https://example.com
Description: 简洁现代的中文博客主题，内置博客主页、文章合集、站内搜索联想、文章目录与相关文章等能力，适合与 OnlineJudge 站点配套使用。
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: echoblog
Tags: blog, one-column, two-columns, custom-logo, custom-menu, featured-images, threaded-comments, translation-ready
*/

/* ========== 基础变量 ========== */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-soft: #eef2ff;
  --accent: #06b6d4;
  --accent-soft: #ecfeff;
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2430;
  --text-light: #4b5563;
  --muted: #8b93a7;
  --border: #e6e8f0;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.06), 0 8px 24px rgba(16, 24, 40, 0.06);
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
  --max-width: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }

h1, h2, h3, h4, h5, h6 {
  line-height: 1.35;
  margin: 0 0 0.6em;
  font-weight: 700;
  color: var(--text);
}

p { margin: 0 0 1em; }

.screen-reader-text {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); border: 0;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ========== 页头 ========== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 16px;
}

.site-brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.site-brand .custom-logo-link { display: inline-flex; }
.site-brand .custom-logo { width: 36px; height: 36px; object-fit: cover; border-radius: 9px; }
.site-title { font-size: 1.18rem; font-weight: 800; letter-spacing: 0.2px; }
.site-title a { color: var(--text); }
.site-subtitle { display: block; font-size: 0.72rem; color: var(--muted); font-weight: 500; letter-spacing: 0.4px; }

.main-navigation { display: flex; align-items: center; gap: 4px; }
.main-navigation ul { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; }
.main-navigation li { position: relative; }
.main-navigation a {
  display: block; padding: 8px 14px; border-radius: 9px;
  color: var(--text-light); font-weight: 600; font-size: 0.95rem;
}
.main-navigation a:hover,
.main-navigation .current-menu-item > a,
.main-navigation .current_page_item > a { color: var(--primary); background: var(--primary-soft); }
.main-navigation .sub-menu {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 180px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  box-shadow: var(--shadow); padding: 6px; display: none;
}
.main-navigation li:hover > .sub-menu { display: block; }
.main-navigation .sub-menu a { padding: 8px 12px; }

.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--card); color: var(--text-light); cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.icon-btn:hover { color: var(--primary); border-color: var(--primary); background: var(--primary-soft); }
.icon-btn svg { width: 18px; height: 18px; }

.menu-toggle { display: none; }

/* ========== 搜索层 ========== */
.search-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(6px);
  display: none; align-items: flex-start; justify-content: center;
  padding-top: 12vh;
}
.search-overlay.open { display: flex; }
.search-panel {
  width: min(620px, calc(100vw - 40px));
  background: var(--card); border-radius: 16px; box-shadow: var(--shadow);
  padding: 22px; position: relative;
}
.search-panel h3 { margin: 0 0 12px; font-size: 1rem; color: var(--text-light); }
.search-field-wrap { display: flex; gap: 10px; }
.search-field {
  flex: 1; padding: 12px 16px; border: 2px solid var(--border); border-radius: 12px;
  font-size: 1rem; outline: none; transition: border-color 0.2s; background: var(--bg);
}
.search-field:focus { border-color: var(--primary); background: #fff; }
.search-submit-btn {
  padding: 0 22px; border: 0; border-radius: 12px; background: var(--primary);
  color: #fff; font-weight: 700; cursor: pointer; transition: background 0.2s;
}
.search-submit-btn:hover { background: var(--primary-dark); }
.search-suggestions { margin-top: 12px; display: none; }
.search-suggestions.visible { display: block; }
.suggestion-list { list-style: none; margin: 0; padding: 0; }
.suggestion-list li { border-bottom: 1px solid var(--border); }
.suggestion-list li:last-child { border-bottom: 0; }
.suggestion-list a {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 8px; color: var(--text); border-radius: 8px;
}
.suggestion-list a:hover { background: var(--primary-soft); }
.suggestion-list .type { font-size: 0.75rem; color: var(--primary); background: var(--primary-soft); padding: 2px 8px; border-radius: 99px; white-space: nowrap; }
.search-close {
  position: absolute; top: 12px; right: 12px; border: 0; background: none;
  color: var(--muted); cursor: pointer; font-size: 1.2rem; line-height: 1;
}

/* ========== 主页 Hero ========== */
.blog-hero {
  margin: 28px 0 4px; padding: 42px 40px; border-radius: 20px;
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 55%, #06b6d4 120%);
  color: #fff; box-shadow: 0 16px 40px rgba(79, 70, 229, 0.25);
  position: relative; overflow: hidden;
}
.blog-hero::after {
  content: ""; position: absolute; right: -70px; top: -70px; width: 260px; height: 260px;
  border-radius: 50%; background: rgba(255, 255, 255, 0.12);
}
.blog-hero h1 { color: #fff; font-size: 1.9rem; margin: 0 0 8px; position: relative; z-index: 1; }
.blog-hero p { color: rgba(255, 255, 255, 0.88); margin: 0 0 20px; max-width: 560px; position: relative; z-index: 1; }
.blog-hero .hero-actions { margin-bottom: 22px; position: relative; z-index: 1; }
.blog-hero .hero-oj-btn {
	display: inline-flex; align-items: center; padding: 11px 22px;
	background: #ffffff; color: var(--primary); border-radius: 11px;
	font-weight: 800; font-size: 0.95rem; box-shadow: 0 8px 24px rgba(0,0,0,0.18);
	transition: transform 0.2s, box-shadow 0.2s;
}
.blog-hero .hero-oj-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(0,0,0,0.24); color: var(--primary-dark); }
.hero-stats { display: flex; gap: 28px; position: relative; z-index: 1; }
.hero-stats b { font-size: 1.35rem; display: block; }
.hero-stats span { font-size: 0.8rem; color: rgba(255, 255, 255, 0.78); }

/* ========== 布局 ========== */
.page-content { padding: 24px 0 60px; }
.content-with-sidebar { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 28px; align-items: start; }
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 22px; }
.featured-post { grid-column: 1 / -1; }

/* ========== 文章卡片 ========== */
.post-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: transform 0.25s, box-shadow 0.25s; display: flex; flex-direction: column;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.post-card .thumb { aspect-ratio: 16 / 9; overflow: hidden; background: var(--primary-soft); }
.post-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.post-card:hover .thumb img { transform: scale(1.04); }
.post-card .card-body { padding: 18px 18px 16px; display: flex; flex-direction: column; flex: 1; }
.post-card .cat-chip {
  align-self: flex-start; font-size: 0.74rem; font-weight: 700; color: var(--primary);
  background: var(--primary-soft); padding: 3px 10px; border-radius: 99px; margin-bottom: 10px;
}
.post-card h2 { font-size: 1.12rem; margin: 0 0 8px; }
.post-card h2 a { color: var(--text); }
.post-card h2 a:hover { color: var(--primary); }
.post-card .excerpt { font-size: 0.9rem; color: var(--text-light); margin: 0 0 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-card .card-meta { margin-top: auto; display: flex; align-items: center; gap: 12px; font-size: 0.78rem; color: var(--muted); }
.post-card .card-meta .avatar { width: 24px; height: 24px; border-radius: 50%; object-fit: cover; }

.post-card.featured { flex-direction: row; }
.post-card.featured .thumb { width: 46%; aspect-ratio: auto; }
.post-card.featured .card-body { justify-content: center; }
.post-card.featured h2 { font-size: 1.45rem; }

/* ========== 侧边栏 ========== */
.sidebar-widget {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-bottom: 22px;
}
.sidebar-widget h3, .sidebar-widget .widget-title {
  font-size: 1rem; margin: 0 0 14px; padding-bottom: 10px;
  border-bottom: 2px solid var(--primary-soft); position: relative;
}
.sidebar-widget h3::after, .sidebar-widget .widget-title::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 42px; height: 2px; background: var(--primary);
}
.sidebar-widget ul { list-style: none; margin: 0; padding: 0; }
.sidebar-widget li { margin-bottom: 4px; }
.sidebar-widget li a { color: var(--text-light); font-size: 0.92rem; display: block; padding: 5px 8px; border-radius: 8px; }
.sidebar-widget li a:hover { color: var(--primary); background: var(--primary-soft); }
.widget_recent_entries .post-date { color: var(--muted); font-size: 0.78rem; margin-left: 6px; }
.tag-cloud, .wp-block-tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud a, .wp-block-tag-cloud a {
  font-size: 0.8rem !important; padding: 4px 12px; border-radius: 99px;
  background: var(--bg); border: 1px solid var(--border); color: var(--text-light);
}
.tag-cloud a:hover, .wp-block-tag-cloud a:hover { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }

.sidebar-search form { display: flex; gap: 8px; }
.sidebar-search .search-field { flex: 1; padding: 10px 14px; }
.sidebar-search .search-submit {
  border: 0; background: var(--primary); color: #fff; border-radius: 10px;
  padding: 0 16px; font-weight: 700; cursor: pointer;
}

/* ========== 归档页头 ========== */
.archive-header {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 30px; margin-bottom: 26px;
}
.archive-header h1 { font-size: 1.5rem; margin: 0 0 4px; }
.archive-header .archive-desc { color: var(--muted); font-size: 0.9rem; margin: 0; }

/* ========== 文章合集 ========== */
.collection-page { max-width: 900px; margin: 0 auto; }
.collection-toolbar {
  display: flex; gap: 14px; flex-wrap: wrap; align-items: center;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 20px; margin-bottom: 24px; position: sticky; top: 78px; z-index: 20;
}
.collection-toolbar .search-field { flex: 1; min-width: 220px; padding: 10px 14px; }
.collection-count { color: var(--muted); font-size: 0.85rem; white-space: nowrap; }
.filter-chips { display: flex; flex-wrap: wrap; gap: 8px; width: 100%; }
.filter-chip {
  border: 1px solid var(--border); background: var(--bg); color: var(--text-light);
  padding: 5px 14px; border-radius: 99px; font-size: 0.84rem; cursor: pointer; transition: all 0.2s;
}
.filter-chip:hover { border-color: var(--primary); color: var(--primary); }
.filter-chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.collection-year { margin-bottom: 30px; }
.collection-year h2 {
  font-size: 1.2rem; display: flex; align-items: baseline; gap: 10px;
  border-bottom: 2px solid var(--border); padding-bottom: 8px; margin-bottom: 14px;
}
.collection-year h2 .count { color: var(--muted); font-size: 0.85rem; font-weight: 500; }
.collection-list { list-style: none; margin: 0; padding: 0; }
.collection-list li {
  display: flex; align-items: baseline; gap: 16px; padding: 10px 12px;
  border-radius: 10px; transition: background 0.2s;
}
.collection-list li:hover { background: var(--card); }
.collection-list .date { color: var(--muted); font-size: 0.82rem; min-width: 74px; font-variant-numeric: tabular-nums; }
.collection-list .title { flex: 1; font-weight: 600; color: var(--text); }
.collection-list li:hover .title { color: var(--primary); }
.collection-list .cats { display: flex; gap: 6px; }
.collection-list .cat-mini { font-size: 0.7rem; color: var(--primary); background: var(--primary-soft); padding: 2px 8px; border-radius: 99px; }
.collection-empty { text-align: center; color: var(--muted); padding: 40px 0; }

/* ========== 搜索页 ========== */
.search-page { max-width: 900px; margin: 0 auto; }
.search-summary { margin-bottom: 22px; font-size: 0.95rem; color: var(--text-light); }
.search-summary b { color: var(--primary); }
.search-result-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 24px; margin-bottom: 16px; transition: box-shadow 0.2s;
}
.search-result-item:hover { box-shadow: var(--shadow); }
.search-result-item h2 { font-size: 1.1rem; margin: 0 0 6px; }
.search-result-item .excerpt { color: var(--text-light); font-size: 0.92rem; margin: 0 0 10px; }
.search-result-item .excerpt mark, .search-result-item h2 mark { background: #fef08a; color: inherit; border-radius: 3px; padding: 0 2px; }
.search-result-item .meta { font-size: 0.78rem; color: var(--muted); display: flex; gap: 14px; flex-wrap: wrap; }
.no-results {
  text-align: center; background: var(--card); border: 1px dashed var(--border);
  border-radius: var(--radius); padding: 60px 20px; color: var(--muted);
}
.no-results h2 { color: var(--text); }

/* ========== 文章详情 ========== */
.single-layout { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 28px; align-items: start; }
.article-wrap {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px 40px;
}
.article-head h1 { font-size: 1.75rem; margin: 0 0 14px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 16px; color: var(--muted); font-size: 0.85rem; margin-bottom: 22px; }
.article-meta a { color: var(--muted); }
.article-meta a:hover { color: var(--primary); }
.article-body { font-size: 1.02rem; }
.article-body h2 { font-size: 1.4rem; margin-top: 2em; padding-top: 0.6em; border-top: 1px solid var(--border); }
.article-body h3 { font-size: 1.18rem; margin-top: 1.6em; }
.article-body img { border-radius: 12px; }
.article-body blockquote {
  margin: 1.4em 0; padding: 12px 20px; border-left: 4px solid var(--primary);
  background: var(--primary-soft); border-radius: 0 10px 10px 0; color: var(--text-light);
}
.article-body pre {
  background: #0f172a; color: #e2e8f0; padding: 18px 20px; border-radius: 12px;
  overflow-x: auto; font-size: 0.88rem; line-height: 1.6;
}
.article-body code { font-family: "JetBrains Mono", Consolas, "Courier New", monospace; font-size: 0.9em; }
.article-body :not(pre) > code { background: var(--primary-soft); color: var(--primary-dark); padding: 2px 6px; border-radius: 6px; }
.article-body table { border-collapse: collapse; width: 100%; margin: 1.2em 0; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.article-body th { background: var(--bg); }
.article-toc {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 20px; position: sticky; top: 84px;
}
.article-toc h4 { font-size: 0.92rem; margin: 0 0 10px; color: var(--text-light); }
.article-toc ul { list-style: none; margin: 0; padding: 0; font-size: 0.85rem; }
.article-toc a { color: var(--text-light); display: block; padding: 4px 8px; border-left: 2px solid var(--border); }
.article-toc a:hover { color: var(--primary); border-left-color: var(--primary); }
.article-toc .toc-h3 { padding-left: 20px; }
.article-tags { margin: 28px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.article-tags a {
  font-size: 0.8rem; padding: 4px 12px; border-radius: 99px;
  background: var(--bg); border: 1px solid var(--border); color: var(--text-light);
}
.article-tags a:hover { color: var(--primary); border-color: var(--primary); background: var(--primary-soft); }
.post-navigation { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 26px; }
.post-navigation a {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 20px; font-size: 0.88rem; color: var(--text); transition: box-shadow 0.2s;
}
.post-navigation a:hover { box-shadow: var(--shadow); color: var(--primary); }
.post-navigation .nav-label { display: block; color: var(--muted); font-size: 0.76rem; margin-bottom: 4px; }
.post-navigation .next { text-align: right; }
.related-posts { margin-top: 28px; }
.related-posts h3 { font-size: 1.05rem; margin-bottom: 14px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.related-grid a {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px 16px; color: var(--text); font-size: 0.88rem; transition: all 0.2s;
}
.related-grid a:hover { border-color: var(--primary); color: var(--primary); box-shadow: var(--shadow-sm); }
.related-grid .rdate { display: block; font-size: 0.75rem; color: var(--muted); margin-top: 4px; }

/* ========== 分页 ========== */
.pagination { display: flex; gap: 8px; justify-content: center; margin: 30px 0 0; flex-wrap: wrap; }
.pagination .page-numbers {
  min-width: 38px; height: 38px; padding: 0 12px; display: inline-flex; align-items: center; justify-content: center;
  background: var(--card); border: 1px solid var(--border); border-radius: 10px; color: var(--text-light); font-weight: 600;
}
.pagination .page-numbers.current { background: var(--primary); border-color: var(--primary); color: #fff; }
.pagination .page-numbers:hover:not(.current) { border-color: var(--primary); color: var(--primary); }

/* ========== 页脚 ========== */
.site-footer { background: #0f172a; color: #cbd5e1; padding: 48px 0 0; margin-top: 40px; }
.footer-widgets { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; padding-bottom: 34px; }
.footer-widget h3, .footer-widget .widget-title { color: #fff; font-size: 1rem; margin: 0 0 14px; }
.footer-widget ul { list-style: none; margin: 0; padding: 0; }
.footer-widget li { margin-bottom: 6px; }
.footer-widget a { color: #94a3b8; font-size: 0.88rem; }
.footer-widget a:hover { color: #fff; }
.footer-brand p { color: #94a3b8; font-size: 0.88rem; max-width: 320px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1); padding: 18px 0; text-align: center;
  font-size: 0.82rem; color: #64748b;
}
.footer-bottom a { color: #94a3b8; }

/* ========== 回到顶部 ========== */
.back-to-top {
  position: fixed; right: 24px; bottom: 24px; width: 44px; height: 44px;
  border-radius: 12px; border: 0; background: var(--primary); color: #fff;
  cursor: pointer; box-shadow: var(--shadow); opacity: 0; visibility: hidden;
  transition: all 0.25s; z-index: 60; font-size: 1.1rem;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .content-with-sidebar { grid-template-columns: 1fr; }
  .sidebar { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 22px; }
  .single-layout { grid-template-columns: 1fr; }
  .article-toc { position: static; margin-bottom: 22px; }
  .footer-widgets { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .menu-toggle { display: inline-flex; }
  .main-navigation {
    position: fixed; top: 64px; left: 0; right: 0; bottom: 0; z-index: 90;
    background: #fff; flex-direction: column; align-items: stretch; padding: 20px;
    transform: translateX(100%); transition: transform 0.25s; overflow-y: auto;
  }
  .main-navigation.open { transform: translateX(0); }
  .main-navigation ul { flex-direction: column; }
  .main-navigation li { width: 100%; }
  .main-navigation a { padding: 14px 16px; font-size: 1rem; }
  .main-navigation .sub-menu { position: static; box-shadow: none; border: 0; padding-left: 16px; display: block; }
  .blog-hero { padding: 30px 24px; }
  .blog-hero h1 { font-size: 1.5rem; }
  .hero-stats { flex-wrap: wrap; gap: 18px; }
  .post-card.featured { flex-direction: column; }
  .post-card.featured .thumb { width: 100%; aspect-ratio: 16 / 9; }
  .sidebar { display: block; }
  .article-wrap { padding: 24px 20px; }
  .article-head h1 { font-size: 1.4rem; }
  .post-navigation { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-widgets { grid-template-columns: 1fr; gap: 24px; }
  .collection-toolbar { position: static; }
}