:root {
  --font: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
  
  --accent: #1a1a1a;
  --text: #1a1a1a;
  --text-muted: #525252;
  --bg: #fafafa;
  --bg-alt: #f4f4f5;
  --border: #e4e4e7;
  
  --nav-w: 260px;
  --content-max: 1000px;
  
  --toggle-x: calc(100% - 30px);
  --toggle-y: 30px;
}

[data-theme="dark"] {
  --accent: #d4d4d4;
  --text: #e4e4e7;
  --text-muted: #a1a1aa;
  --bg: #09090b;
  --bg-alt: #111113;
  --border: #27272a;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --accent: #d4d4d4;
    --text: #e4e4e7;
    --text-muted: #a1a1aa;
    --bg: #09090b;
    --bg-alt: #111113;
    --border: #27272a;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* 水波纹过渡动画 */
::view-transition-old(root) { animation: none; z-index: -1; }
::view-transition-new(root) { animation: theme-reveal 0.5s ease-out; }
@keyframes theme-reveal {
  from { clip-path: circle(0% at var(--toggle-x) var(--toggle-y)); }
  to { clip-path: circle(150% at var(--toggle-x) var(--toggle-y)); }
}

.layout { display: flex; flex: 1; width: 100%; }

/* ====== 左侧导航 ====== */
.nav {
  position: sticky; top: 0;
  width: var(--nav-w); height: 100vh;
  overflow-y: auto; flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: var(--bg-alt);
  padding: 1.5rem 0; font-size: 0.875rem;
  z-index: 900;
}
.nav-inner { padding: 0 1rem; }
.nav-list, .nav-list ul { list-style: none !important; padding: 0; margin: 0; }
.nav-header {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0 1rem 1rem; margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.nav-logo { width: 32px; height: 32px; object-fit: contain; }
.nav-title { font-size: 1.05rem; font-weight: 700; }
.nav-section-title {
  padding: 0.5rem 0.75rem 0.2rem; font-weight: 600; font-size: 0.75rem;
  text-transform: uppercase; color: var(--text-muted);
}
.nav-list a {
  display: block; padding: 0.4rem 0.75rem;
  color: var(--text-muted); text-decoration: none;
  border-radius: 6px; transition: all 0.15s;
}
.nav-list a:hover { color: var(--text); background: var(--border); }
.nav-list a.active {
  color: var(--text); background: var(--border); font-weight: 600;
  border-left: 2px solid var(--accent);
}

/* ====== 右侧主内容区 ====== */
.main {
  flex: 1; min-width: 0;
  max-width: var(--content-max);
  margin: 0 auto; padding: 2rem 2.5rem;
}
.page-title { font-size: 2.2rem; font-weight: 800; margin-bottom: 0.5em; }
.page-meta { color: var(--text-muted); font-size: 0.875rem; margin-bottom: 1.5rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border); }

/* 搜索框 */
.search-box {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg-alt); border: 1px solid var(--border);
  padding: 0 12px; border-radius: 6px; margin-bottom: 1rem;
  transition: border-color 0.2s;
}
.search-box:focus-within { border-color: var(--text-muted); }
.search-box svg { color: var(--text-muted); flex-shrink: 0; }
.search-box input {
  flex: 1; background: transparent; border: none; padding: 10px 0;
  color: var(--text); font-family: var(--font); font-size: 0.9rem; outline: none;
}

/* 标签栏 */
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 1.5rem; }
.tab-btn {
  background: var(--bg-alt); border: 1px solid var(--border); color: var(--text-muted);
  padding: 6px 14px; border-radius: 6px; cursor: pointer; font-family: var(--font); font-size: 0.85rem;
  transition: all 0.15s;
}
.tab-btn:hover { color: var(--text); border-color: var(--text-muted); }
.tab-btn.active { background: var(--accent); color: var(--bg); border-color: var(--accent); font-weight: 700; }

/* 表格 */
.table-wrapper {
  overflow-x: auto; margin: 0 0 2rem 0;
  border: 1px solid var(--border); border-radius: 8px;
  box-shadow: 0 4px 20px -5px rgba(0, 0, 0, 0.05);
  scrollbar-width: thin;
}
table { width: 100%; min-width: 850px; border-collapse: collapse; font-size: 0.875rem; text-align: left; }
th, td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--border); }
th { font-weight: 600; background: var(--bg-alt); color: var(--text-muted); text-transform: uppercase; font-size: 0.8rem; }

th.sortable { cursor: pointer; user-select: none; position: relative; }
th.sortable:hover { color: var(--text); }
th.sortable::after { content: ' ↕'; opacity: 0.3; font-size: 1.1em; }
th.sortable.asc::after { content: ' ↑'; opacity: 1; color: var(--text); }
th.sortable.desc::after { content: ' ↓'; opacity: 1; color: var(--text); }

tbody tr:nth-child(even) { background-color: var(--bg-alt); }
tbody tr:hover { background-color: var(--border); }

/* 链接无下划线 */
table a, .footer a { color: var(--text) !important; font-weight: 600; text-decoration: none !important; border-bottom: 1px solid transparent; }
table a:hover, .footer a:hover { border-bottom-color: var(--text); }

.col-rank { color: var(--text-muted); width: 50px; }
.col-rank.top-10 { font-weight: 700; color: var(--text); font-size: 1.05rem; }
.col-stars { text-align: right; color: var(--text); font-weight: 600; }
.col-growth { text-align: right; color: var(--text); font-size: 0.85rem; }
.col-lang { color: var(--text-muted); font-size: 0.85rem; }
.col-desc { color: var(--text-muted); font-size: 0.8rem; max-width: 300px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.loading { text-align: center; padding: 50px; color: var(--text-muted); }

/* 骨架屏 */
@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}
.skeleton {
  height: 20px; width: 100%; border-radius: 4px;
  background: linear-gradient(90deg, var(--bg-alt) 25%, var(--border) 50%, var(--bg-alt) 75%);
  background-size: 1000px 100%;
  animation: shimmer 2s infinite linear;
}

/* 页脚 */
.footer {
  width: 100%; text-align: center; padding: 2rem 1rem;
  border-top: 1px solid var(--border); background: var(--bg-alt);
  font-size: 0.8rem; color: var(--text-muted);
}

/* ====== 悬浮按钮 (重点修改区) ====== */
/* 右上角按钮组容器 */
.header-actions {
  position: fixed; top: 0.75rem; right: 0.75rem; z-index: 1000;
  display: flex; gap: 8px;
}

/* 按钮通用样式 */
.action-btn {
  display: flex; align-items: center; justify-content: center;
  min-width: 36px; height: 36px; padding: 0 10px;
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: 8px;
  cursor: pointer; color: var(--text-muted); font-family: var(--font); font-size: 0.85rem; font-weight: 600;
  transition: all 0.2s; box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.action-btn:hover { color: var(--text); background: var(--border); }

/* 主题切换按钮特殊处理 */
.theme-toggle {
  position: relative; /* 让内部 SVG 可以绝对定位 */
  width: 36px; padding: 0;
}
.theme-toggle svg { position: absolute; transition: all 0.3s; }
.theme-toggle .icon-sun { opacity: 1; transform: scale(1); }
.theme-toggle .icon-moon { opacity: 0; transform: scale(0.5); }
[data-theme="dark"] .theme-toggle .icon-sun { opacity: 0; transform: scale(0.5); }
[data-theme="dark"] .theme-toggle .icon-moon { opacity: 1; transform: scale(1); }

/* 返回顶部按钮 (保持在右下角) */
.back-to-top {
  position: fixed; bottom: 2rem; right: 1.5rem; z-index: 1000;
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: 50%; cursor: pointer; color: var(--text-muted);
  transition: all 0.3s ease; box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  opacity: 0; pointer-events: none; transform: translateY(10px); 
}
.back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover { color: var(--text); background: var(--border); }

.nav-toggle { display: none; }
.nav-backdrop { display: none; }

/* ====== 手机端适配 ====== */
@media (max-width: 768px) {
  .layout { flex-direction: column; }
  .nav {
    position: fixed; top: 0; left: 0;
    width: 280px; height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.3s;
  }
  .nav.nav--open { transform: translateX(0); }
  .nav-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 899; display: none; }
  .nav-backdrop--visible { display: block; }
  
  /* 左上角汉堡菜单按钮 */
  .nav-toggle {
    display: flex; position: fixed; top: 0.75rem; left: 0.75rem; z-index: 1000;
    width: 36px; height: 36px; align-items: center; justify-content: center;
    background: var(--bg-alt); border: 1px solid var(--border);
    border-radius: 8px; cursor: pointer; color: var(--text-muted);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  }
  
  .main { padding: 4rem 1rem 1.5rem; width: 100%; }
  .page-title { font-size: 1.75rem; }
  .back-to-top { bottom: 1.5rem; right: 1rem; width: 36px; height: 36px; }
       }