:root{
  --bg:#f3f5f7; --panel:#ffffff; --card:#ffffff; --text:#1f2329; --muted:#8b93a1;
  --line:#e7eaee; --accent:#15a06a; --accent-soft:#e6f6ef; --tagbg:#f5f7f9; --tagbg-hover:#eef6f2;
  --new:#ff4d6d; --shadow:0 1px 3px rgba(20,30,45,.08),0 6px 18px rgba(20,30,45,.05);
  --shadow-hover:0 4px 12px rgba(20,30,45,.12),0 14px 34px rgba(20,30,45,.10);
}
body.dark{
  --bg:#0f1318; --panel:#161b22; --card:#171d26; --text:#e6e9ee; --muted:#7d8694;
  --line:#222a35; --accent:#2ecb86; --accent-soft:#13332a; --tagbg:#1c232e; --tagbg-hover:#222c39;
  --new:#ff5e7a; --shadow:0 1px 3px rgba(0,0,0,.4); --shadow-hover:0 10px 30px rgba(0,0,0,.5);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  background:var(--bg);color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:14px;line-height:1.5;
}
button{font-family:inherit;cursor:pointer}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:14px;
  height:56px;padding:0 16px;background:var(--panel);border-bottom:1px solid var(--line);
}
.brand{font-size:18px;font-weight:800;letter-spacing:1px}
.brand span{color:var(--accent)}
.icon-btn{
  border:none;background:transparent;color:var(--text);font-size:18px;text-decoration:none;
  width:36px;height:36px;border-radius:10px;display:grid;place-items:center;
}
.icon-btn:hover{background:var(--tagbg)}
.icon-btn svg{display:block}
.topbar-actions{margin-left:auto;display:flex;align-items:center;gap:4px;flex:none}
.github-mark{width:22px;height:22px}
.theme-btn svg{width:20px;height:20px;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;fill:none}
.codex-pick select{
  border:1px solid var(--line);background:var(--card);color:var(--text);
  border-radius:10px;padding:7px 12px;font-size:13px;max-width:280px;
}
.search-wrap{flex:1;max-width:520px;position:relative;display:flex;align-items:center}
.search-ico{position:absolute;left:12px;opacity:.5;font-size:13px;pointer-events:none}
#search{
  width:100%;border:1px solid var(--line);background:var(--card);color:var(--text);
  border-radius:12px;padding:9px 12px 9px 34px;font-size:14px;outline:none;
}
#search:focus{border-color:var(--accent)}
.toggle{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:13px;white-space:nowrap;cursor:pointer}
.toggle input{accent-color:var(--accent);width:15px;height:15px}

/* ---------- 布局 ---------- */
.layout{display:flex;align-items:flex-start}
.sidebar{
  position:sticky;top:56px;align-self:flex-start;flex:0 0 248px;width:248px;
  height:calc(100vh - 56px);overflow-y:auto;background:var(--panel);
  border-right:1px solid var(--line);padding:14px 10px;
}
.sb-head{padding:6px 10px 12px}
.codex-title{display:block;font-weight:700;font-size:15px}
.codex-meta{display:block;color:var(--muted);font-size:12px;margin-top:2px}
.main{flex:1;min-width:0;padding:18px 22px 80px}

/* ---------- 目录树 ---------- */
.tree{font-size:13.5px}
.tree-item{user-select:none}
.tree-row{
  display:flex;align-items:center;gap:4px;padding:6px 8px;border-radius:8px;cursor:pointer;color:var(--text);
}
.tree-row:hover{background:var(--tagbg)}
.tree-row.active{background:var(--accent-soft);color:var(--accent);font-weight:600}
.tw-arrow{width:14px;text-align:center;color:var(--muted);font-size:10px;transition:transform .15s}
.tree-item.collapsed>.tree-row .tw-arrow{transform:rotate(-90deg)}
.tw-name{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tw-count{color:var(--muted);font-size:11px}
.tree-children{margin-left:12px;border-left:1px solid var(--line);padding-left:4px}
.tree-item.collapsed>.tree-children{display:none}

/* ---------- 结果栏 ---------- */
.result-bar{color:var(--muted);font-size:13px;margin-bottom:14px;min-height:18px}
.result-bar b{color:var(--accent)}

/* ---------- 瀑布流 ---------- */
.masonry{display:flex;gap:16px;align-items:flex-start}
.col{flex:1;min-width:0;display:flex;flex-direction:column;gap:16px}

.card{
  background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;
  box-shadow:var(--shadow);cursor:pointer;transition:transform .12s,box-shadow .12s,border-color .12s;
  position:relative;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:transparent}
.card.copied{outline:2px solid var(--accent)}
.card-img-wrap{position:relative;line-height:0;background:var(--tagbg)}
.card-img{width:100%;height:auto;display:block}
.zoom-btn{
  position:absolute;top:8px;right:8px;border:none;border-radius:8px;width:30px;height:30px;
  background:rgba(0,0,0,.45);color:#fff;font-size:13px;opacity:0;transition:opacity .12s;
}
.card-img-wrap:hover .zoom-btn{opacity:1}
.card-body{padding:12px 13px 11px}
.card-title-row{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.card-title{margin:0;font-size:15px;font-weight:700;line-height:1.3;word-break:break-word}
.badge-new{
  flex:none;font-size:10px;font-weight:800;letter-spacing:.5px;color:#fff;background:var(--new);
  padding:2px 6px;border-radius:6px;
}
.card.no-img .card-title{font-size:14.5px}
.card-tags{
  font-size:12.5px;color:var(--muted);background:var(--tagbg);border-radius:10px;padding:9px 10px;
  white-space:pre-wrap;word-break:break-word;max-height:7.2em;overflow:hidden;
  -webkit-mask-image:linear-gradient(180deg,#000 70%,transparent);transition:background .12s;
}
.card:hover .card-tags{background:var(--tagbg-hover)}
.card-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:9px}
.card-path{color:var(--muted);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.copy-hint{color:var(--accent);font-size:11px;font-weight:600;opacity:0;transition:opacity .12s;white-space:nowrap}
.card:hover .copy-hint{opacity:1}

/* ---------- 待配图小卡 ---------- */
.card.no-img .card-img-wrap{display:none}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:40px;transform:translateX(-50%) translateY(20px);
  background:var(--accent);color:#fff;padding:10px 20px;border-radius:999px;font-weight:600;font-size:14px;
  box-shadow:0 8px 24px rgba(0,0,0,.2);opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:60;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- 灯箱 ---------- */
.lightbox{
  position:fixed;inset:0;z-index:80;background:rgba(0,0,0,.85);display:none;place-items:center;padding:30px;cursor:zoom-out;
}
.lightbox:not([hidden]){display:grid}
.lightbox img{max-width:95vw;max-height:92vh;border-radius:10px;box-shadow:0 10px 40px rgba(0,0,0,.5)}

.empty{color:var(--muted);text-align:center;padding:60px 0}
.sentinel{height:1px}

/* ---------- 响应式 ---------- */
.sidebar.hidden{display:none}
@media (max-width:600px){
  .topbar{gap:10px;padding:0 10px}
  .topbar-actions{gap:2px}
  .icon-btn{width:34px;height:34px}
  .github-mark{width:21px;height:21px}
  .sidebar{position:fixed;z-index:25;top:56px;left:0;box-shadow:var(--shadow-hover)}
  .toggle span{display:none}
  .brand{font-size:16px}
}