/*
Theme Name: BTPress
Theme URI: https://www.bt.cn/
Author: BTPress
Author URI: https://www.bt.cn/
Description: 宝塔工作台风格的 WordPress 主题 / 插件分享站主题。左右分栏 + 顶部导航栏 + 卡片式资源列表，内置「主题」「插件」两种资源类型、下载统计、自定义字段与深浅色切换。
Version: 1.1.0
Requires at least: 5.9
Tested up to: 7.1
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: btpress
Tags: dark, custom-menu, featured-images, threaded-comments, translation-ready, two-columns
*/

/* ==========================================================================
   1. 变量与基础
   ========================================================================== */
:root {
  --bt-green: #21a544;
  --bt-green-dark: #1b8c39;
  --bt-green-soft: rgba(33, 165, 68, 0.12);
  --bt-green-line: rgba(33, 165, 68, 0.35);
  --bt-red: #e04a4a;
  --bt-orange: #e6a23c;
  --bt-blue: #409eff;

  --bt-bg: #14171a;
  --bt-panel: #1b2025;
  --bt-card: #1f252b;
  --bt-card-hover: #252c33;
  --bt-border: #2a3239;
  --bt-input: #12161a;
  --bt-text: #e7ebef;
  --bt-text-2: #aeb7c0;
  --bt-muted: #7d8791;
  --bt-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
  --bt-shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.2);
  --bt-topbar: #101316;
  --bt-topbar-text: #cfd6dd;
  --bt-topbar-border: #262d34;

  --bt-radius: 8px;
  --bt-radius-sm: 6px;
  --bt-topbar-h: 56px;
  --bt-sidebar-w: 208px;
  --bt-wrap: 1320px;
  --bt-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

html[data-theme="light"] {
  --bt-bg: #f0f2f5;
  --bt-panel: #ffffff;
  --bt-card: #ffffff;
  --bt-card-hover: #ffffff;
  --bt-border: #e3e7ec;
  --bt-input: #ffffff;
  --bt-text: #24292f;
  --bt-text-2: #4d5761;
  --bt-muted: #8b949e;
  --bt-shadow: 0 8px 24px rgba(16, 24, 40, 0.1);
  --bt-shadow-sm: 0 1px 4px rgba(16, 24, 40, 0.06);
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bt-bg);
  color: var(--bt-text);
  font-family: var(--bt-font);
  font-size: 14px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; vertical-align: middle; }
a { color: var(--bt-text); text-decoration: none; transition: color .15s ease, border-color .15s ease; }
a:hover { color: var(--bt-green); }
h1, h2, h3, h4, h5, h6 { margin: 0 0 .6em; color: var(--bt-text); font-weight: 600; line-height: 1.35; }
h1 { font-size: 24px; }
h2 { font-size: 19px; }
h3 { font-size: 16px; }
p { margin: 0 0 1em; }
ul, ol { padding-left: 1.4em; }
code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
}
pre {
  background: var(--bt-input);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius-sm);
  padding: 14px;
  overflow: auto;
}
code { background: var(--bt-input); border-radius: 4px; padding: 1px 5px; color: var(--bt-green); }
pre code { background: none; padding: 0; color: var(--bt-text-2); }
blockquote {
  margin: 0 0 1em;
  padding: 10px 16px;
  border-left: 3px solid var(--bt-green);
  background: var(--bt-green-soft);
  border-radius: 0 var(--bt-radius-sm) var(--bt-radius-sm) 0;
  color: var(--bt-text-2);
}
table { border-collapse: collapse; width: 100%; }
th, td { border: 1px solid var(--bt-border); padding: 8px 10px; text-align: left; }
th { background: var(--bt-card-hover); font-weight: 600; }
hr { border: 0; border-top: 1px solid var(--bt-border); margin: 24px 0; }

.bt-icon { flex: 0 0 auto; vertical-align: -3px; }
.screen-reader-text {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px); clip-path: inset(50%); white-space: nowrap;
}
.bt-skip-link:focus {
  position: fixed; top: 8px; left: 8px; z-index: 999; background: var(--bt-green);
  color: #fff; padding: 8px 16px; border-radius: var(--bt-radius-sm); clip: auto;
  width: auto; height: auto; clip-path: none;
}

/* ==========================================================================
   2. 顶部导航栏
   ========================================================================== */
.bt-topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--bt-topbar-h);
  background: var(--bt-topbar);
  border-bottom: 1px solid var(--bt-topbar-border);
}
.bt-topbar-inner {
  max-width: var(--bt-wrap);
  height: 100%;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.bt-brand { display: flex; align-items: center; gap: 9px; flex: 0 0 auto; color: var(--bt-topbar-text); }
.bt-brand:hover { color: #fff; }
.bt-brand-mark {
  width: 30px; height: 30px; border-radius: 7px;
  background: linear-gradient(135deg, var(--bt-green), #17c05a);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 15px; letter-spacing: -.5px;
}
.bt-brand-text { font-size: 16px; font-weight: 600; color: #fff; letter-spacing: .3px; }
.bt-brand-sub {
  font-size: 11px; color: var(--bt-muted); border: 1px solid var(--bt-topbar-border);
  border-radius: 3px; padding: 0 5px; margin-left: 2px;
}
.bt-topnav { display: flex; align-items: center; gap: 4px; flex: 1 1 auto; min-width: 0; }
.bt-topnav a {
  color: var(--bt-topbar-text);
  padding: 7px 13px;
  border-radius: var(--bt-radius-sm);
  font-size: 14px;
  white-space: nowrap;
}
.bt-topnav > li > a:hover { background: rgba(255, 255, 255, 0.07); color: #fff; }
.bt-topnav .current-menu-item > a,
.bt-topnav .current-menu-ancestor > a,
.bt-topnav .current_page_item > a { background: var(--bt-green); color: #fff; }
.bt-topnav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 4px; }
.bt-topnav ul ul { display: none; }
.bt-topnav li { position: relative; }
.bt-topbar-right { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.bt-head-search {
  display: flex; align-items: center; gap: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--bt-topbar-border);
  border-radius: 16px; padding: 0 12px; height: 32px; color: var(--bt-muted);
}
.bt-head-search input {
  border: 0; background: none; outline: none; color: var(--bt-topbar-text);
  width: 130px; font-size: 13px; font-family: inherit;
}
.bt-head-search input::placeholder { color: #6b747d; }
.bt-iconbtn {
  width: 32px; height: 32px; display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--bt-topbar-border); background: rgba(255, 255, 255, 0.04);
  border-radius: var(--bt-radius-sm); color: var(--bt-topbar-text); cursor: pointer;
}
.bt-iconbtn:hover { color: #fff; border-color: #3a444d; }
.bt-btn-top {
  height: 32px; padding: 0 14px; display: inline-flex; align-items: center; gap: 6px;
  background: var(--bt-green); color: #fff; border-radius: var(--bt-radius-sm);
  font-size: 13px; font-weight: 500;
}
.bt-btn-top:hover { background: var(--bt-green-dark); color: #fff; }
.bt-menu-toggle { display: none; }

/* ==========================================================================
   3. 骨架布局
   ========================================================================== */
.bt-shell {
  max-width: var(--bt-wrap);
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: 0;
  min-height: calc(100vh - var(--bt-topbar-h));
}
.bt-sidebar {
  flex: 0 0 var(--bt-sidebar-w);
  width: var(--bt-sidebar-w);
  background: var(--bt-panel);
  border-right: 1px solid var(--bt-border);
  min-height: calc(100vh - var(--bt-topbar-h));
  padding: 14px 10px 30px;
  position: sticky;
  top: var(--bt-topbar-h);
  max-height: calc(100vh - var(--bt-topbar-h));
  overflow-y: auto;
}
.bt-sidebar::-webkit-scrollbar { width: 6px; }
.bt-sidebar::-webkit-scrollbar-thumb { background: #39424b; border-radius: 3px; }
.bt-menu-label {
  font-size: 11px; color: var(--bt-muted); text-transform: uppercase;
  letter-spacing: .8px; padding: 12px 12px 6px;
}
.bt-menu { list-style: none; margin: 0; padding: 0; }
.bt-menu ul { list-style: none; margin: 0; padding: 0; }
.bt-menu li { position: relative; }
.bt-menu a {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: var(--bt-radius-sm);
  color: var(--bt-text-2); font-size: 14px;
}
.bt-menu a:hover { background: var(--bt-card-hover); color: var(--bt-text); }
.bt-menu a .bt-icon { color: var(--bt-muted); }
.bt-menu a:hover .bt-icon { color: var(--bt-text-2); }
.bt-menu .current-menu-item > a,
.bt-menu .current_page_item > a,
.bt-menu .current-menu-ancestor > a {
  background: var(--bt-green-soft); color: var(--bt-green); font-weight: 500;
}
.bt-menu .current-menu-item > a .bt-icon,
.bt-menu .current_page_item > a .bt-icon { color: var(--bt-green); }
.bt-menu .current-menu-item > a::before,
.bt-menu .current_page_item > a::before,
.bt-menu .current-menu-ancestor > a::before {
  content: ""; position: absolute; left: 0; top: 7px; bottom: 7px; width: 3px;
  background: var(--bt-green); border-radius: 0 2px 2px 0;
}
.bt-menu .bt-count {
  margin-left: auto; font-size: 11px; color: var(--bt-muted);
  background: var(--bt-card-hover); border-radius: 9px; padding: 0 7px; line-height: 18px;
}
.bt-menu ul.sub-menu { padding-left: 30px; }
.bt-menu ul.sub-menu a { padding: 7px 12px; font-size: 13px; }

.bt-main {
  flex: 1 1 auto;
  min-width: 0;
  padding: 18px 22px 44px;
}

/* 侧栏小工具 */
.bt-widget { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--bt-border); }
.bt-widget-title {
  font-size: 13px; font-weight: 600; color: var(--bt-text);
  margin: 0 0 10px; display: flex; align-items: center; gap: 6px;
}
.bt-widget ul { list-style: none; margin: 0; padding: 0; }
.bt-widget li { margin-bottom: 8px; font-size: 13px; color: var(--bt-text-2); }
.bt-widget li a { color: var(--bt-text-2); }
.bt-widget li a:hover { color: var(--bt-green); }
.bt-widget .tagcloud { display: flex; flex-wrap: wrap; gap: 6px; }
.bt-widget .tagcloud a {
  font-size: 12px !important; background: var(--bt-card-hover); border: 1px solid var(--bt-border);
  border-radius: 12px; padding: 2px 10px; color: var(--bt-text-2);
}

/* ==========================================================================
   4. 通用组件
   ========================================================================== */
.bt-panel {
  background: var(--bt-panel);
  border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius);
  padding: 16px 18px;
  margin-bottom: 18px;
}
.bt-page-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 14px; margin-bottom: 16px; flex-wrap: wrap;
}
.bt-page-title {
  font-size: 20px; margin: 0; display: flex; align-items: center; gap: 8px;
}
.bt-page-title::before {
  content: ""; width: 3px; height: 17px; background: var(--bt-green);
  border-radius: 2px; display: inline-block;
}
.bt-page-desc { color: var(--bt-muted); font-size: 13px; margin: 4px 0 0; }

.bt-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 34px; padding: 0 16px; border-radius: var(--bt-radius-sm);
  background: var(--bt-green); color: #fff; border: 1px solid var(--bt-green);
  font-size: 14px; font-family: inherit; cursor: pointer;
  transition: background .15s ease, transform .15s ease, border-color .15s ease;
}
.bt-btn:hover { background: var(--bt-green-dark); border-color: var(--bt-green-dark); color: #fff; }
.bt-btn-lg { height: 42px; padding: 0 24px; font-size: 15px; }
.bt-btn-sm { height: 28px; padding: 0 12px; font-size: 13px; }
.bt-btn-ghost {
  background: transparent; color: var(--bt-text-2); border-color: var(--bt-border);
}
.bt-btn-ghost:hover { background: var(--bt-card-hover); color: var(--bt-text); border-color: #3b4550; }
.bt-btn-block { width: 100%; }
.bt-btn[disabled] { opacity: .5; cursor: not-allowed; }

.bt-badge {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 11px; line-height: 18px; padding: 0 7px; border-radius: 4px;
  background: var(--bt-green-soft); color: var(--bt-green); border: 1px solid var(--bt-green-line);
}
.bt-badge-blue { background: rgba(64, 158, 255, .12); color: var(--bt-blue); border-color: rgba(64, 158, 255, .35); }
.bt-badge-orange { background: rgba(230, 162, 60, .12); color: var(--bt-orange); border-color: rgba(230, 162, 60, .35); }
.bt-badge-gray { background: var(--bt-card-hover); color: var(--bt-muted); border-color: var(--bt-border); }

.bt-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.bt-chip {
  display: inline-flex; align-items: center; gap: 5px; height: 30px; padding: 0 13px;
  border: 1px solid var(--bt-border); border-radius: 15px;
  font-size: 13px; color: var(--bt-text-2); background: var(--bt-panel);
}
.bt-chip:hover { border-color: var(--bt-green-line); color: var(--bt-green); }
.bt-chip.is-active { background: var(--bt-green); border-color: var(--bt-green); color: #fff; }
.bt-chip .bt-count { font-size: 11px; opacity: .75; }

.bt-meta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; color: var(--bt-muted); font-size: 12.5px; }
.bt-meta-row span { display: inline-flex; align-items: center; gap: 5px; }

.bt-breadcrumb {
  font-size: 12.5px; color: var(--bt-muted); margin-bottom: 12px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 7px;
}
.bt-breadcrumb a { color: var(--bt-muted); }
.bt-breadcrumb a:hover { color: var(--bt-green); }
.bt-breadcrumb .sep { color: #4d565f; }

.bt-empty {
  text-align: center; padding: 52px 20px; color: var(--bt-muted);
  border: 1px dashed var(--bt-border); border-radius: var(--bt-radius);
}
.bt-empty strong { display: block; color: var(--bt-text); font-size: 16px; margin-bottom: 6px; }

.bt-notice {
  border: 1px solid var(--bt-green-line); background: var(--bt-green-soft);
  border-radius: var(--bt-radius-sm); padding: 12px 14px; font-size: 13px; color: var(--bt-text-2);
}
.bt-notice p:last-child { margin-bottom: 0; }

/* 分页 */
.bt-pagination { display: flex; justify-content: center; margin: 24px 0 8px; }
.bt-pagination .page-numbers {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 32px; height: 32px; padding: 0 8px; margin: 0 3px;
  border: 1px solid var(--bt-border); border-radius: var(--bt-radius-sm);
  background: var(--bt-panel); color: var(--bt-text-2); font-size: 13px;
}
.bt-pagination .page-numbers:hover { border-color: var(--bt-green-line); color: var(--bt-green); }
.bt-pagination .page-numbers.current { background: var(--bt-green); border-color: var(--bt-green); color: #fff; }
.bt-pagination .dots { border-color: transparent; background: none; }

/* 表单 */
.bt-search-form { display: flex; gap: 8px; }
.bt-search-form .bt-input { flex: 1 1 auto; }
.bt-input, input[type="text"], input[type="search"], input[type="email"], input[type="url"], input[type="password"], select, textarea {
  width: 100%; height: 34px; padding: 0 12px; font-family: inherit; font-size: 14px;
  color: var(--bt-text); background: var(--bt-input);
  border: 1px solid var(--bt-border); border-radius: var(--bt-radius-sm); outline: none;
}
textarea { height: auto; padding: 10px 12px; line-height: 1.6; }
.bt-input:focus, input:focus, select:focus, textarea:focus { border-color: var(--bt-green); }
input::placeholder, textarea::placeholder { color: #6b747d; }

/* ==========================================================================
   5. 首页
   ========================================================================== */
.bt-hero {
  position: relative; overflow: hidden;
  border: 1px solid var(--bt-border); border-radius: var(--bt-radius);
  background:
    radial-gradient(80% 140% at 12% 0%, rgba(33, 165, 68, .18) 0%, rgba(33, 165, 68, 0) 60%),
    var(--bt-panel);
  padding: 34px 30px 30px; margin-bottom: 18px;
}
.bt-hero h1 { font-size: 27px; margin-bottom: 10px; }
.bt-hero h1 em { font-style: normal; color: var(--bt-green); }
.bt-hero p { color: var(--bt-muted); max-width: 620px; margin-bottom: 18px; }
.bt-hero-search { display: flex; gap: 10px; max-width: 620px; }
.bt-hero-search .bt-input { height: 42px; font-size: 15px; }
.bt-hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.bt-hero-tags a {
  font-size: 12.5px; color: var(--bt-text-2); background: var(--bt-card-hover);
  border: 1px solid var(--bt-border); border-radius: 14px; padding: 3px 12px;
}
.bt-hero-tags a:hover { color: var(--bt-green); border-color: var(--bt-green-line); }

.bt-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-bottom: 18px; }
.bt-stat {
  background: var(--bt-panel); border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius); padding: 14px 16px;
}
.bt-stat-label { color: var(--bt-muted); font-size: 12.5px; display: flex; align-items: center; gap: 6px; }
.bt-stat-value { font-size: 24px; font-weight: 600; margin-top: 4px; letter-spacing: -.4px; }
.bt-stat-value small { font-size: 12px; color: var(--bt-muted); font-weight: 400; margin-left: 4px; }

.bt-section { margin-bottom: 26px; }
.bt-section-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 14px; gap: 12px;
}
.bt-section-head h2 { margin: 0; font-size: 17px; display: flex; align-items: center; gap: 8px; }
.bt-section-head h2::before {
  content: ""; width: 3px; height: 15px; background: var(--bt-green);
  border-radius: 2px; display: inline-block;
}
.bt-more { font-size: 13px; color: var(--bt-muted); display: inline-flex; align-items: center; gap: 4px; }
.bt-more:hover { color: var(--bt-green); }

/* ==========================================================================
   6. 资源卡片 / 列表
   ========================================================================== */
.bt-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(248px, 1fr)); gap: 16px; }
.bt-grid-2 { grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); }
.bt-grid-side { grid-template-columns: 1fr; }

.bt-card {
  display: flex; flex-direction: column; overflow: hidden;
  background: var(--bt-card); border: 1px solid var(--bt-border);
  border-radius: var(--bt-radius);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.bt-card:hover {
  transform: translateY(-3px); box-shadow: var(--bt-shadow); border-color: var(--bt-green-line);
}
.bt-card-thumb {
  position: relative; display: block; aspect-ratio: 16 / 10; overflow: hidden;
  background: linear-gradient(135deg, #23303a, #1a222a);
}
html[data-theme="light"] .bt-card-thumb { background: linear-gradient(135deg, #eef2f6, #e2e8ee); }
.bt-card-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.bt-card:hover .bt-card-thumb img { transform: scale(1.04); }
.bt-card-thumb .bt-ph {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  font-size: 34px; font-weight: 700; color: rgba(255, 255, 255, .1); letter-spacing: 2px;
}
html[data-theme="light"] .bt-card-thumb .bt-ph { color: rgba(36, 41, 47, .08); }
.bt-card-type {
  position: absolute; left: 10px; top: 10px; backdrop-filter: blur(4px);
}
.bt-card-price {
  position: absolute; right: 10px; top: 10px; font-size: 11px; line-height: 18px;
  padding: 0 7px; border-radius: 4px; background: rgba(0, 0, 0, .55); color: #fff;
}
.bt-card-body { padding: 13px 14px 14px; display: flex; flex-direction: column; flex: 1 1 auto; }
.bt-card-title {
  font-size: 15px; font-weight: 600; margin: 0 0 6px; line-height: 1.45;
  display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}
.bt-card-title a { color: var(--bt-text); }
.bt-card-title a:hover { color: var(--bt-green); }
.bt-card-desc {
  color: var(--bt-muted); font-size: 12.5px; line-height: 1.6; margin: 0 0 12px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  min-height: 40px;
}
.bt-card-meta {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  color: var(--bt-muted); font-size: 12px;
  padding-top: 10px; border-top: 1px solid var(--bt-border); margin-top: auto;
}
.bt-card-meta span { display: inline-flex; align-items: center; gap: 4px; }
.bt-card-meta .bt-dl { color: var(--bt-green); margin-left: auto; }

/* 横向列表项（侧栏 / 相关推荐） */
.bt-mini { display: flex; gap: 10px; padding: 10px 0; border-bottom: 1px dashed var(--bt-border); }
.bt-mini:last-child { border-bottom: 0; padding-bottom: 0; }
.bt-mini-thumb {
  flex: 0 0 72px; width: 72px; height: 48px; border-radius: var(--bt-radius-sm);
  overflow: hidden; background: linear-gradient(135deg, #23303a, #1a222a);
  display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.12);
}
.bt-mini-thumb img { width: 100%; height: 100%; object-fit: cover; }
.bt-mini-body { min-width: 0; }
.bt-mini-title {
  font-size: 13.5px; font-weight: 500; margin: 0 0 3px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.bt-mini-meta { font-size: 12px; color: var(--bt-muted); }

/* ==========================================================================
   7. 资源详情页
   ========================================================================== */
.bt-single-head { display: flex; gap: 20px; align-items: flex-start; flex-wrap: wrap; }
.bt-single-shot {
  flex: 0 0 300px; width: 300px; aspect-ratio: 16 / 10; border-radius: var(--bt-radius-sm);
  overflow: hidden; border: 1px solid var(--bt-border);
  background: linear-gradient(135deg, #23303a, #1a222a);
  display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.12);
}
.bt-single-shot img { width: 100%; height: 100%; object-fit: cover; }
.bt-single-info { flex: 1 1 320px; min-width: 0; }
.bt-single-info h1 { font-size: 23px; margin: 4px 0 10px; }
.bt-single-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }

.bt-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 18px; align-items: start; }
.bt-layout > aside { position: sticky; top: calc(var(--bt-topbar-h) + 18px); }

.bt-tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--bt-border); margin: -4px 0 18px; flex-wrap: wrap; }
.bt-tab {
  position: relative; background: none; border: 0; cursor: pointer; font-family: inherit;
  color: var(--bt-muted); font-size: 14px; padding: 11px 16px;
}
.bt-tab:hover { color: var(--bt-text); }
.bt-tab.is-active { color: var(--bt-green); font-weight: 500; }
.bt-tab.is-active::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: -1px; height: 2px;
  background: var(--bt-green); border-radius: 2px;
}
.bt-tab-panel { display: none; }
.bt-tab-panel.is-active { display: block; }

.bt-entry { font-size: 14.5px; color: var(--bt-text-2); }
.bt-entry h2, .bt-entry h3, .bt-entry h4 { color: var(--bt-text); margin-top: 1.4em; }
.bt-entry img { border-radius: var(--bt-radius-sm); border: 1px solid var(--bt-border); }
.bt-entry a { color: var(--bt-green); text-decoration: underline; text-underline-offset: 2px; }
.bt-entry ul, .bt-entry ol { margin: 0 0 1em; }
.bt-entry li { margin-bottom: .35em; }
.bt-logs { white-space: pre-wrap; word-break: break-word; color: var(--bt-text-2); font-size: 13.5px; }

.bt-spec { list-style: none; margin: 0; padding: 0; }
.bt-spec li {
  display: flex; justify-content: space-between; gap: 12px; padding: 9px 0;
  border-bottom: 1px dashed var(--bt-border); font-size: 13px;
}
.bt-spec li:last-child { border-bottom: 0; }
.bt-spec .k { color: var(--bt-muted); flex: 0 0 auto; }
.bt-spec .v { color: var(--bt-text); text-align: right; word-break: break-all; }

.bt-author { display: flex; align-items: center; gap: 10px; }
.bt-author img { border-radius: 50%; }
.bt-author-name { font-size: 14px; font-weight: 500; }
.bt-author-role { font-size: 12px; color: var(--bt-muted); }

.bt-download-box { text-align: center; }
.bt-download-box .bt-btn { margin-bottom: 8px; }
.bt-download-note { font-size: 12px; color: var(--bt-muted); }

/* 文章（教程） */
.bt-post-head { margin-bottom: 18px; }
.bt-post-title { font-size: 24px; margin: 0 0 10px; }
.bt-post-thumb { margin-bottom: 20px; border-radius: var(--bt-radius); overflow: hidden; }

/* 评论 */
.bt-comments { margin-top: 28px; }
.bt-comment-list { list-style: none; margin: 0; padding: 0; }
.bt-comment-list .children { list-style: none; padding-left: 22px; }
.bt-comment {
  padding: 14px 0; border-bottom: 1px dashed var(--bt-border);
}
.bt-comment-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.bt-comment-head img { border-radius: 50%; }
.bt-comment-author { font-size: 13.5px; font-weight: 500; }
.bt-comment-date { font-size: 12px; color: var(--bt-muted); }
.bt-comment-body { color: var(--bt-text-2); font-size: 13.5px; }
.comment-form p { margin-bottom: 12px; }
.comment-form label { display: block; font-size: 13px; color: var(--bt-muted); margin-bottom: 5px; }
.comment-form input[type="submit"] {
  height: 34px; padding: 0 18px; border: 1px solid var(--bt-green); border-radius: var(--bt-radius-sm);
  background: var(--bt-green); color: #fff; cursor: pointer; font-family: inherit; font-size: 14px;
}
.comment-form input[type="submit"]:hover { background: var(--bt-green-dark); }

/* 404 */
.bt-404 { text-align: center; padding: 70px 20px; }
.bt-404-code { font-size: 84px; font-weight: 700; line-height: 1; color: var(--bt-green); letter-spacing: -2px; }
.bt-404 h1 { margin: 14px 0 8px; }
.bt-404 p { color: var(--bt-muted); margin-bottom: 20px; }
.bt-404 .bt-search-form { max-width: 420px; margin: 0 auto; }

/* 页脚 */
.bt-footer {
  background: var(--bt-topbar); border-top: 1px solid var(--bt-topbar-border);
  padding: 26px 20px 22px; color: var(--bt-muted); font-size: 13px;
}
.bt-footer-inner {
  max-width: var(--bt-wrap); margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center;
}
.bt-footer-links { display: flex; flex-wrap: wrap; gap: 16px; list-style: none; margin: 0; padding: 0; }
.bt-footer-links a { color: var(--bt-muted); }
.bt-footer-links a:hover { color: var(--bt-green); }
.bt-footer-copy { color: #6b747d; }

/* 回到顶部 */
.bt-totop {
  position: fixed; right: 24px; bottom: 28px; z-index: 50;
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--bt-panel); border: 1px solid var(--bt-border); color: var(--bt-text-2);
  display: none; align-items: center; justify-content: center; cursor: pointer;
  box-shadow: var(--bt-shadow-sm);
}
.bt-totop.is-visible { display: flex; }
.bt-totop:hover { color: var(--bt-green); border-color: var(--bt-green-line); }

/* 遮罩（移动端侧栏） */
.bt-overlay {
  display: none; position: fixed; inset: var(--bt-topbar-h) 0 0; z-index: 55;
  background: rgba(0, 0, 0, .5);
}
body.bt-sidebar-open .bt-overlay { display: block; }

/* ==========================================================================
   8. 响应式
   ========================================================================== */
@media (max-width: 1180px) {
  .bt-head-search { display: none; }
}
@media (max-width: 1024px) {
  .bt-layout { grid-template-columns: minmax(0, 1fr); }
  .bt-layout > aside { position: static; }
  .bt-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .bt-menu-toggle { display: inline-flex; }
  .bt-topnav { display: none; }
  .bt-sidebar {
    position: fixed; left: 0; top: var(--bt-topbar-h); z-index: 58;
    height: calc(100vh - var(--bt-topbar-h)); max-height: none;
    transform: translateX(-102%); transition: transform .22s ease;
  }
  body.bt-sidebar-open .bt-sidebar { transform: translateX(0); }
  .bt-main { padding: 16px 14px 40px; }
  .bt-single-shot { flex: 0 0 100%; width: 100%; }
}
@media (max-width: 560px) {
  .bt-hero { padding: 24px 18px; }
  .bt-hero h1 { font-size: 22px; }
  .bt-hero-search { flex-direction: column; }
  .bt-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .bt-stat-value { font-size: 20px; }
  .bt-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
  .bt-card-desc { display: none; }
  .bt-page-title { font-size: 18px; }
}