/* ============ 统一暗色侧边栏（全站） ============ */

:root {
  --sidebar-width: 290px;
  --sb-bg: #18181a;
  --sb-bg-alt: #1f1f22;
  --sb-text: #d6d0c1;
  --sb-muted: #8a8578;
  --sb-accent: #d4a94a;       /* 金色强调 */
  --sb-accent-soft: #c4bca7;
  --sb-hover: #2a2a2e;
  --sb-active: rgba(212, 169, 74, 0.1);
  --sb-border: #2d2d30;
}

/* ------ Body 布局 ------ */
body {
  display: flex;
  min-height: 100vh;
  margin: 0;
}

body .site-header { display: none; } /* 全站用侧边栏替代顶部导航 */

/* ------ 侧边栏容器 ------ */
.sidebar {
  width: var(--sidebar-width);
  background: var(--sb-bg);
  color: var(--sb-text);
  flex-shrink: 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  overflow-y: auto;
  z-index: 50;
  font-family: var(--font-sans);
  border-right: 1px solid var(--sb-border);
  transition: transform 0.25s ease;
}

.sidebar::-webkit-scrollbar { width: 5px; }
.sidebar::-webkit-scrollbar-thumb { background: #3a3a3e; border-radius: 3px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }

/* ------ 侧边栏顶部 ------ */
.sb-brand {
  padding: 22px 22px 18px;
  border-bottom: 1px solid var(--sb-border);
}

.sb-brand a {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--sb-text);
  text-decoration: none;
  letter-spacing: 0.04em;
  display: block;
}
.sb-brand a:hover { text-decoration: none; color: var(--sb-accent); }

.sb-brand .sb-subtitle {
  font-size: 11px;
  color: var(--sb-muted);
  letter-spacing: 0.1em;
  margin-top: 4px;
  text-transform: uppercase;
}

/* ------ 首页按钮 ------ */
.sb-home {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  color: var(--sb-text);
  text-decoration: none;
  font-size: 14px;
  border-bottom: 1px solid var(--sb-border);
  transition: background 0.15s;
}

.sb-home:hover {
  background: var(--sb-hover);
  text-decoration: none;
  color: var(--sb-accent);
}

.sb-home.active {
  background: var(--sb-active);
  color: var(--sb-accent);
  border-left: 3px solid var(--sb-accent);
  padding-left: 19px;
}

.sb-home-icon { font-size: 16px; }

/* ------ 搜索框 ------ */
.sb-search {
  padding: 14px 18px 6px;
}

.sb-search input {
  width: 100%;
  padding: 8px 12px;
  background: var(--sb-bg-alt);
  color: var(--sb-text);
  border: 1px solid var(--sb-border);
  border-radius: 3px;
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}

.sb-search input:focus {
  border-color: var(--sb-accent);
}

.sb-search input::placeholder {
  color: var(--sb-muted);
}

/* ------ 分组标题（可展开） ------ */
.sb-group {
  border-bottom: 1px solid var(--sb-border);
}

.sb-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 22px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

.sb-group-header:hover { background: var(--sb-hover); }

.sb-group-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--sb-text);
  letter-spacing: 0.04em;
  font-weight: 500;
}

.sb-toggle {
  color: var(--sb-muted);
  font-size: 10px;
  transition: transform 0.2s;
  display: inline-block;
  width: 10px;
}

.sb-group.open .sb-toggle { transform: rotate(90deg); }

.sb-count {
  background: transparent;
  color: var(--sb-muted);
  font-size: 11px;
  font-family: var(--font-sans);
  padding: 1px 6px;
}

/* ------ 分组内条目列表 ------ */
.sb-items {
  display: none;
  padding: 4px 0 10px;
  background: #141416;
}

.sb-group.open .sb-items { display: block; }

.sb-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  padding: 7px 22px 7px 38px;
  font-size: 13px;
  line-height: 1.45;
  color: var(--sb-text);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all 0.1s;
}

.sb-item:hover {
  background: var(--sb-hover);
  color: var(--sb-accent);
  text-decoration: none;
}

.sb-item.active {
  background: var(--sb-active);
  color: var(--sb-accent);
  border-left-color: var(--sb-accent);
  padding-left: 36px;
}

.sb-item-title { flex: 1; min-width: 0; }

.sb-item-date {
  font-size: 10.5px;
  color: var(--sb-muted);
  letter-spacing: 0.02em;
  white-space: nowrap;
  margin-top: 2px;
}

.sb-item-lang {
  display: inline-block;
  font-size: 9px;
  padding: 1px 5px;
  border-radius: 2px;
  margin-right: 6px;
  letter-spacing: 0.05em;
  vertical-align: middle;
  background: #2d2d30;
  color: var(--sb-muted);
}

.sb-item-lang.en { background: #2c3e50; color: #a8c5e3; }

/* ------ 底部链接 ------ */
.sb-footer {
  padding: 16px 22px 24px;
  border-top: 1px solid var(--sb-border);
  margin-top: 20px;
}

.sb-footer a {
  display: block;
  color: var(--sb-muted);
  text-decoration: none;
  font-size: 13px;
  padding: 6px 0;
  transition: color 0.15s;
}

.sb-footer a:hover { color: var(--sb-accent); text-decoration: none; }

/* ------ 移动端触发按钮 ------ */
.sb-toggle-mobile {
  display: none;
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 60;
  background: var(--sb-bg);
  color: var(--sb-text);
  border: 1px solid var(--sb-border);
  padding: 8px 14px;
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 13px;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.sb-close {
  display: none;
  position: absolute;
  top: 16px;
  right: 18px;
  background: none;
  border: none;
  color: var(--sb-muted);
  font-size: 22px;
  cursor: pointer;
}

/* ============ 主内容区域 ============ */

main {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 56px clamp(24px, 5vw, 80px) 80px;
  box-sizing: border-box;
  min-width: 0;
}

main > * {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.site-footer {
  margin-left: var(--sidebar-width);
  padding: 28px clamp(24px, 5vw, 80px) 36px;
  max-width: none;
}

.site-footer p,
.site-footer a {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

/* ============ 阅读页特有样式（保留原有） ============ */

.reader {
  flex: 1;
  max-width: 880px;
  margin: 0 auto 0 var(--sidebar-width);
  padding: 56px 64px 80px;
  width: auto;
  box-sizing: border-box;
}

@media (min-width: 1400px) {
  .reader {
    margin-left: calc(var(--sidebar-width) + (100vw - var(--sidebar-width) - 880px) / 2);
  }
}

.breadcrumb {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-muted);
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--ink-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }

.reader-header {
  padding-bottom: 28px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--line);
}

.reader-kicker {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.reader-title {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 14px;
}

.reader-meta { margin-bottom: 16px; }

.meta-badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 12px;
  margin-right: 6px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  letter-spacing: 0.05em;
}

.meta-lang-en { background: #ecf2f8; color: #2c4a6b; border-color: #d0dce8; }
.meta-lang-zh { background: #f5f0e5; color: #6b5d3a; border-color: #e3ddc9; }

.reader-excerpt {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  padding: 16px 20px;
  background: var(--bg-card);
  border-left: 3px solid var(--accent-soft);
  border-radius: 2px;
}

.reader-content {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

.reader-content h1, .reader-content h2, .reader-content h3, .reader-content h4 {
  font-family: var(--font-serif);
  color: var(--ink);
  margin: 32px 0 12px;
  font-weight: 700;
  line-height: 1.4;
}

.reader-content h1 { font-size: 28px; margin-top: 48px; padding-bottom: 8px; border-bottom: 2px solid var(--ink); }
.reader-content h2 { font-size: 22px; margin-top: 40px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.reader-content h3 { font-size: 18px; margin-top: 28px; color: var(--accent); }
.reader-content h4 { font-size: 16px; margin-top: 20px; }

.reader-content h1:first-child, .reader-content h2:first-child { margin-top: 0; }

.reader-content p {
  margin-bottom: 16px;
  text-align: justify;
  text-justify: inter-ideograph;
}

.reader-content ul, .reader-content ol { margin: 0 0 18px 28px; }
.reader-content li { margin-bottom: 6px; line-height: 1.85; }

.reader-content blockquote {
  margin: 20px 0;
  padding: 12px 22px;
  background: var(--bg-card);
  border-left: 4px solid var(--accent);
  color: var(--ink-soft);
  font-style: italic;
  border-radius: 2px;
}

.reader-content strong { color: var(--ink); font-weight: 700; }
.reader-content em { color: var(--ink); font-style: italic; }

.reader-content code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.9em;
  background: #f0ede3;
  padding: 1px 6px;
  border-radius: 3px;
  color: #7a5a2e;
}

.reader-content pre {
  background: #2a2a2a; color: #e6e6e6;
  padding: 16px 20px; border-radius: 6px;
  overflow: auto; margin: 18px 0;
  font-size: 13px; line-height: 1.6;
}

.reader-content pre code { background: transparent; padding: 0; color: inherit; }

.reader-content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.reader-content hr { border: none; border-top: 1px solid var(--line); margin: 32px 0; }

.reader-content table {
  width: 100%; border-collapse: collapse; margin: 20px 0;
  font-family: var(--font-sans); font-size: 14px;
}
.reader-content th, .reader-content td {
  padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line);
}
.reader-content th { background: var(--bg-card); font-weight: 600; border-bottom: 2px solid var(--line); }

.reader-content img { max-width: 100%; height: auto; border-radius: 4px; margin: 18px 0; }

/* ------ PDF 区域 ------ */
.pdf-section {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.pdf-title {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--ink);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.pdf-actions { margin-bottom: 16px; }

.btn {
  display: inline-block;
  padding: 8px 16px;
  background: var(--accent);
  color: white;
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 14px;
  text-decoration: none;
  transition: background 0.15s;
}
.btn:hover { background: #6b2320; text-decoration: none; color: white; }

.pdf-embed {
  width: 100%; height: 800px;
  border: 1px solid var(--line); border-radius: 4px; background: white;
}

/* ------ 上/下一篇 ------ */
.reader-nav {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.nav-link {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  text-decoration: none;
  transition: all 0.15s;
  max-width: 48%;
}
.nav-link:hover {
  border-color: var(--accent-soft);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.nav-direction {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.nav-title {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

.nav-prev { text-align: left; margin-right: auto; }
.nav-next { text-align: right; margin-left: auto; }

.notice {
  padding: 16px 20px;
  background: #fff9f0;
  border: 1px solid #e8dcc0;
  border-radius: 6px;
  margin: 20px 0;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink-soft);
}

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  body { display: block; }
  .sidebar {
    transform: translateX(-100%);
    box-shadow: 4px 0 16px rgba(0,0,0,0.3);
  }
  .sidebar.open { transform: translateX(0); }
  .sb-close { display: block; }
  .sb-toggle-mobile { display: block; }
  main, .reader, .site-footer {
    margin-left: 0;
    padding-left: 20px;
    padding-right: 20px;
  }
  main { padding-top: 60px; }
  .reader { padding-top: 60px; }
  .reader-title { font-size: 26px; }
  .reader-nav { flex-direction: column; }
  .nav-link { max-width: 100%; }
}