:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #1f2328;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #eff6ff;
  --star: #f59e0b;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --radius: 10px;
}
html.dark {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #30363d;
  --border-strong: #484f58;
  --text: #e6edf3;
  --text-muted: #9198a1;
  --text-faint: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --accent-soft: #1a2332;
  --star: #fbbf24;
  --shadow: 0 1px 3px rgba(0,0,0,.4);
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px; line-height: 1.5;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
}
input, select, button { font: inherit; color: inherit; }

/* ---------- Header ---------- */
header {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 20px; background: var(--panel);
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 650; color: var(--text); text-decoration: none; }
.logo .mark {
  width: 30px; height: 30px; border-radius: 8px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  color: #fff; font-size: 16px; font-weight: 700; line-height: 1;
}
.logo .sub { font-size: 12px; color: var(--text-muted); font-weight: 400; }
.spacer { flex: 1; }

.icon-btn {
  width: 36px; height: 36px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--panel);
  color: var(--text-muted); cursor: pointer;
  display: grid; place-items: center; transition: all .15s; flex-shrink: 0;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--bg); }
.icon-btn svg { width: 18px; height: 18px; }
header .icon-btn { border: none; background: transparent; }
header .icon-btn:hover { background: var(--bg); }

/* ---------- 语言切换器 ---------- */
.lang-wrap { position: relative; flex-shrink: 0; }
.lang-btn { width: 36px; height: 36px; border-radius: 8px; border: 0; background: transparent; color: var(--text-muted); cursor: pointer; display: grid; place-items: center; transition: all .15s; font-size: 16px; }
.lang-btn:hover { color: var(--text); background: var(--bg); }
.lang-menu {
  position: absolute; top: calc(100% + 6px); right: 0; z-index: 100;
  min-width: 160px; background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: var(--shadow); padding: 6px;
  display: none;
}
.lang-menu.show { display: block; }
.lang-item {
  display: flex; align-items: center; gap: 8px; width: 100%;
  padding: 8px 10px; border: 0; background: transparent; color: var(--text-muted);
  font-size: 13px; cursor: pointer; border-radius: 6px; transition: all .12s; text-align: left;
}
.lang-item:hover { background: var(--bg); color: var(--text); }
.lang-item.active { color: var(--accent); background: var(--accent-soft); }
.lang-item .check { margin-left: auto; color: var(--accent); }
.lang-item:not(.active) .check { visibility: hidden; }

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 20px; background: var(--panel);
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.search-wrap { flex: 1; position: relative; min-width: 0; max-width: 560px; }
.search-wrap svg.search-icon {
  position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
  width: 16px; height: 16px; color: var(--text-faint); pointer-events: none;
}
#search {
  width: 100%; height: 38px; padding: 0 34px 0 34px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--text); font-size: 14px;
  outline: none; transition: border .15s, box-shadow .15s;
}
#search:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
#search::placeholder { color: var(--text-faint); }
.search-wrap .clear-btn {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  width: 22px; height: 22px; border-radius: 50%; border: 0;
  background: var(--border); color: var(--text-muted); cursor: pointer;
  display: none; align-items: center; justify-content: center; padding: 0;
}
.search-wrap .clear-btn:hover { background: var(--border-strong); color: var(--text); }
.search-wrap .clear-btn.show { display: flex; }
.search-wrap .clear-btn svg { width: 12px; height: 12px; }
/* 「/ 聚焦搜索」快捷键提示徽标：聚焦或已有文字时隐藏 */
.search-wrap .search-hint {
  position: absolute; right: 36px; top: 50%; transform: translateY(-50%);
  font-size: 12px; line-height: 1.4; color: var(--text-faint);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 1px 6px; background: var(--panel); pointer-events: none;
}
#search:focus ~ .search-hint,
.search-wrap .clear-btn.show ~ .search-hint { display: none; }
/* 触屏无快捷键，不显示 */
@media (hover: none) { .search-wrap .search-hint { display: none; } }

.stat { margin-left: auto; font-size: 12px; color: var(--text-muted); white-space: nowrap; }
.stat b { color: var(--text); font-weight: 600; }

/* ---------- Category tabs ---------- */
.tabs {
  display: flex; gap: 6px; overflow-x: auto;
  padding: 10px 20px; background: var(--panel);
  border-bottom: 1px solid var(--border); flex-shrink: 0;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab-btn {
  flex-shrink: 0; height: 32px; padding: 0 14px;
  border: 1px solid var(--border); border-radius: 16px;
  background: var(--panel); color: var(--text-muted); font-size: 13px;
  cursor: pointer; transition: all .15s; white-space: nowrap;
}
.tab-btn:hover { background: var(--bg); color: var(--text); border-color: var(--border-strong); }
.tab-btn.active { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }

/* ---------- Sections & grid ---------- */
main { flex: 1; overflow-y: auto; padding: 0 20px 60px; }
.cat-section { max-width: 1200px; margin: 0 auto 28px; }
/* 首屏顶部间距走 margin（随滚动滚走），不能放 main 的 padding */
.cat-section:first-child { margin-top: 18px; }
.cat-title {
  display: flex; align-items: center; gap: 10px;
  font-size: 15px; font-weight: 600; color: var(--text);
  /* 间距全走 padding（在背景内）：margin 透明带会让滚动内容穿透 pin 住的标题 */
  margin: 0; position: sticky; top: 0;
  background: var(--bg); padding: 8px 0 12px; z-index: 5;
}
.cat-title .count {
  font-size: 12px; color: var(--text-muted); font-weight: 400;
  background: var(--panel); border: 1px solid var(--border);
  padding: 2px 8px; border-radius: 10px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}
.tool-card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  min-width: 0; overflow: hidden; position: relative;
  transition: transform .12s, border-color .12s, box-shadow .12s;
}
.tool-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(37,99,235,.15);
}
html.dark .tool-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,.5); }

.tool-main { min-height: 96px; padding: 16px 18px; display: flex; gap: 14px; align-items: flex-start; }
.tool-icon {
  width: 34px; height: 34px; display: grid; place-items: center; flex: none;
  border: 1px solid var(--border); border-radius: 8px; background: var(--bg);
  color: var(--accent); font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 15px; font-weight: 700; overflow: hidden;
}
.tool-icon img { width: 22px; height: 22px; display: block; }
.tool-text { min-width: 0; flex: 1; }
.tool-text h3 { margin: 0 0 3px; font-size: 15px; line-height: 1.35; display: flex; align-items: center; gap: 7px; }
.tool-text h3 .tool-name { min-width: 0; }
.use-count { display: none; font-size: 11px; font-weight: 400; color: var(--text-muted); background: var(--panel); border: 1px solid var(--border); padding: 1px 7px; border-radius: 9px; white-space: nowrap; flex-shrink: 0; }
.use-count.show { display: inline-block; }
.tool-text p { margin: 0; color: var(--text-muted); font-size: 13px; line-height: 1.45; }

.fav-star {
  flex-shrink: 0; width: 24px; height: 24px; padding: 3px;
  border: 0; background: transparent; cursor: pointer;
  color: var(--text-faint); opacity: 0;
  transition: opacity .12s, color .12s, transform .12s;
}
.fav-star svg { width: 100%; height: 100%; display: block; }
.tool-card:hover .fav-star, .fav-star.on { opacity: 1; }
.fav-star:hover { color: var(--star); transform: scale(1.15); }
.fav-star.on { color: var(--star); }
.fav-star.on svg { fill: currentColor; }
/* 触屏无 hover：星标常显半透明，已收藏保持实色 */
@media (hover: none) { .fav-star { opacity: .45; } .fav-star.on { opacity: 1; } }

.tool-links { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--border); }
.tool-links a { padding: 10px; text-align: center; color: var(--accent); font-weight: 600; text-decoration: none; font-size: 13px; transition: background .12s, color .12s; }
.tool-links a + a { border-left: 1px solid var(--border); }
.tool-links a:hover { background: var(--accent-soft); }
/* 源码入口弱化：次要操作用 muted 色 */
.tool-links a.source { color: var(--text-muted); font-weight: 500; }
.tool-links a.source:hover { color: var(--text); background: var(--bg); }

/* ---------- Empty state ---------- */
.empty-state { max-width: 420px; margin: 10vh auto; text-align: center; color: var(--text-muted); }
.empty-state .big { font-size: 56px; margin-bottom: 14px; }
.empty-state h3 { margin: 0 0 8px; font-size: 17px; color: var(--text); }
.empty-state p { margin: 0; font-size: 13.5px; line-height: 1.7; }

/* ---------- Toast ---------- */
#toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--panel);
  padding: 9px 16px; border-radius: 8px; font-size: 13px;
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
  opacity: 0; pointer-events: none; transition: all .22s;
  z-index: 200;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 6px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@media (max-width: 768px) {
  header { padding: 12px 14px; }
  .toolbar { padding: 8px 14px; }
  .tabs { padding: 8px 14px; }
  main { padding: 0 14px 50px; }
  .logo .sub { display: none; }
  .tool-grid { grid-template-columns: 1fr; gap: 12px; }
  .tool-main { min-height: 86px; padding: 14px; }
}