:root{
  --primary:#4f46e5;--primary-dark:#4338ca;--accent:#0ea5e9;
  --bg:#f4f6fb;--card:#ffffff;--text:#0f172a;--muted:#64748b;
  --border:#e5e9f2;--radius:14px;--sidebar-w:250px;--rail-w:300px;
  --shadow:0 1px 3px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.05);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei",-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:var(--primary);text-decoration:none}
button{font-family:inherit}

/* ===== Header ===== */
.site-header{background:rgba(255,255,255,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.site-header .bar{display:flex;align-items:center;gap:16px;height:62px;padding:0 20px;max-width:1600px;margin:0 auto}
.logo{font-size:20px;font-weight:800;color:var(--text);white-space:nowrap;display:flex;align-items:center;gap:8px}
.logo .g{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.search{flex:1;max-width:520px;position:relative}
/* 提升优先级以覆盖后面的 input[type=text] 规则，确保左内边距生效，放大镜不压字 */
.site-header .search input{width:100%;border:1px solid var(--border);border-radius:999px;padding:10px 16px 10px 42px;font-size:14px;background:#fff;outline:none;transition:.2s}
.lang-sel{height:38px;border:1px solid var(--border);border-radius:9px;background:#fff;color:var(--text);font-size:13.5px;padding:0 8px;cursor:pointer;outline:none}
.lang-sel:focus{border-color:var(--primary)}
.search input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.12)}
.search::before{content:"🔍";position:absolute;left:14px;top:50%;transform:translateY(-50%);font-size:14px;opacity:.6}
.header-links{display:flex;gap:6px}
.header-links a{color:var(--muted);padding:7px 12px;border-radius:8px;font-size:14px}
.header-links a:hover{background:#eef2ff;color:var(--primary)}
.menu-btn{display:none;background:#eef2ff;color:var(--primary);border:none;width:40px;height:40px;border-radius:10px;font-size:20px;cursor:pointer}

/* ===== Layout ===== */
.layout{display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr) var(--rail-w);gap:24px;max-width:1600px;margin:0 auto;padding:22px 20px 40px;align-items:start}

/* ===== Sidebar ===== */
.sidebar{position:sticky;top:80px;max-height:calc(100vh - 100px);overflow-y:auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:12px;box-shadow:var(--shadow)}
.sidebar::-webkit-scrollbar{width:6px}.sidebar::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:3px}
/* ===== Sidebar accordion（大类可折叠 + 小类分组） ===== */
.cat{margin-bottom:4px;border-radius:10px}
.cat-title{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:#475569;padding:10px 11px;letter-spacing:.2px;cursor:pointer;border-radius:9px;user-select:none;transition:.15s}
.cat-title:hover{background:#f1f5f9}
.cat-title .em{font-size:16px}
.cat-title .cat-name{flex:1}
.cat .caret{font-size:10px;color:#94a3b8;transition:transform .2s;transform:rotate(0)}
.cat.open .caret{transform:rotate(90deg);color:var(--primary)}
.cat-body{display:none;padding:1px 0 5px}
.cat.open .cat-body{display:block}
.sub-group{margin:1px 0 5px}
.sub-title{font-size:11.5px;font-weight:600;color:#94a3b8;padding:7px 10px 3px;letter-spacing:.3px}
.side-link{display:flex;align-items:center;gap:9px;padding:7px 10px 7px 14px;border-radius:8px;color:#334155;font-size:13.5px;cursor:pointer;transition:.15s;margin:1px 0}
.side-link:hover{background:#f1f5f9;color:var(--primary)}
.side-link.active{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-weight:600}
.side-link .em{width:18px;text-align:center;font-size:14px}

/* ===== Main ===== */
.main{min-width:0}
h1{font-size:28px;margin-bottom:4px}
.desc{color:var(--muted);margin-bottom:18px;font-size:15px}

/* hero */
.hero{background:linear-gradient(135deg,#4f46e5,#0ea5e9);color:#fff;border-radius:20px;padding:38px 32px;margin-bottom:22px;box-shadow:0 12px 30px rgba(79,70,229,.25)}
.hero h1{font-size:32px;color:#fff}
.hero p{opacity:.92;font-size:16px;margin-top:6px}
.hero .stat{display:flex;gap:26px;margin-top:18px;flex-wrap:wrap}
.hero .stat b{font-size:22px}.hero .stat span{display:block;font-size:13px;opacity:.85}

/* category section on home */
.home-cat{margin-bottom:26px}
.home-cat h2{font-size:19px;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.home-cat h2 .badge{font-size:12px;font-weight:600;color:var(--muted);background:#eef2ff;padding:2px 9px;border-radius:999px}
.home-sub{font-size:15px;margin:18px 0 10px;padding-left:10px;border-left:3px solid var(--primary);color:var(--text)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;cursor:pointer;transition:.18s;box-shadow:var(--shadow)}
.card:hover{transform:translateY(-3px);border-color:var(--primary);box-shadow:0 10px 28px rgba(79,70,229,.14)}
.card .icon{font-size:26px}
.card h3{margin:8px 0 3px;font-size:15px}
.card p{color:var(--muted);font-size:12.5px;line-height:1.45}

/* tool panel */
.panel{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-bottom:18px;box-shadow:var(--shadow)}
.panel h2{font-size:17px;margin-bottom:12px}
.drop{border:2px dashed #c7d2fe;border-radius:var(--radius);padding:32px;text-align:center;color:var(--muted);cursor:pointer;transition:.2s;background:#fafbff}
.drop:hover,.drop.over{border-color:var(--primary);background:#eef2ff}
.drop input{display:none}
.drop .big{font-size:30px}

.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:12px 0}
label{font-size:14px;color:#475569}
input[type=number],input[type=text],input[type=password],input[type=datetime-local],input[type=date],select,textarea{border:1px solid var(--border);border-radius:9px;padding:9px 11px;font-size:14px;background:#fff;color:var(--text);outline:none;transition:.15s}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.1)}
input[type=range]{accent-color:var(--primary)}
input[type=color]{width:46px;height:36px;padding:2px;border:1px solid var(--border);border-radius:8px;background:#fff;cursor:pointer}
textarea{width:100%;font-family:Consolas,Menlo,monospace;resize:vertical}
button,.btn{background:var(--primary);color:#fff;border:none;border-radius:9px;padding:10px 18px;font-size:14px;cursor:pointer;transition:.15s;font-weight:600}
button:hover,.btn:hover{background:var(--primary-dark)}
button:disabled{background:#cbd5e1;cursor:not-allowed}
button.ghost{background:#eef2ff;color:var(--primary)}
button.ghost:hover{background:#e0e7ff}
button.small{padding:5px 11px;font-size:12.5px}
.result-box{background:#f8fafc;border:1px solid var(--border);border-radius:9px;padding:12px 14px;font-family:Consolas,Menlo,monospace;font-size:14px;word-break:break-all;white-space:pre-wrap;min-height:44px}

/* file list */
.flist{margin:12px 0}
.fitem{display:flex;align-items:center;gap:10px;padding:10px 13px;border:1px solid var(--border);border-radius:9px;margin-bottom:8px;background:#fff;font-size:14px;flex-wrap:wrap}
.fitem .name{flex:1;min-width:130px;word-break:break-all}
.fitem .meta{color:var(--muted);font-size:12px}
.fitem .saved{color:#dc2626;font-weight:700;font-size:12px}

/* ===== Ad slots ===== */
.ad-slot{margin:18px 0}
.ad-placeholder{border:1.5px dashed #cbd5e1;border-radius:var(--radius);background:repeating-linear-gradient(45deg,#f8fafc,#f8fafc 12px,#f1f5f9 12px,#f1f5f9 24px);color:#94a3b8;font-size:13px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.ad-placeholder small{font-size:11px;margin-top:3px;opacity:.8}
.ad-banner .ad-placeholder{min-height:90px}
.ad-inline .ad-placeholder{min-height:100px}
.ad-rail-box{position:sticky;top:80px}
.ad-rail .ad-placeholder{min-height:600px}
.ad-rail-box .card-note{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px;margin-top:14px;font-size:12.5px;color:var(--muted);box-shadow:var(--shadow)}

/* seo text */
.seo-text{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-top:8px;font-size:14px;color:#475569;box-shadow:var(--shadow)}
.seo-text h2{font-size:16px;margin-bottom:6px;color:var(--text)}
.seo-text h2:not(:first-child){margin-top:14px}

/* footer */
.site-footer{background:#fff;border-top:1px solid var(--border);padding:24px 20px;color:var(--muted);font-size:13px;text-align:center}
.site-footer a{margin:0 4px}
.wrap{max-width:900px;margin:36px auto;padding:0 20px}

/* ===== Cookie 同意条 ===== */
.cookie-bar{display:none;position:fixed;left:0;right:0;bottom:0;z-index:60;background:#0f172a;color:#e2e8f0;font-size:13.5px;padding:13px 18px;display:flex;gap:14px;align-items:center;justify-content:center;flex-wrap:wrap;box-shadow:0 -6px 20px rgba(0,0,0,.18)}
.cookie-bar.show{display:flex}
.cookie-bar span{flex:1;min-width:220px;line-height:1.5}
.cookie-bar a{color:#93c5fd}
.cookie-bar button{background:#4f46e5;color:#fff;border:none;border-radius:9px;padding:9px 18px;font-size:13.5px;cursor:pointer;white-space:nowrap}
.cookie-bar button:hover{background:#4338ca}

canvas.wave{width:100%;height:120px;background:#0f172a;border-radius:9px;display:block}
.error{color:#dc2626;font-size:13px;margin-top:8px;white-space:pre-wrap}
.ok{color:#16a34a;font-size:13px;margin-top:8px}
.hint{color:var(--muted);font-size:12.5px}
.tag{display:inline-block;background:#eef2ff;color:var(--primary);border-radius:999px;padding:2px 10px;font-size:12px;margin:2px}
.preview-img{max-width:100%;border-radius:9px;border:1px solid var(--border);margin-top:10px}
table.kv{width:100%;border-collapse:collapse;font-size:14px}
table.kv td{border:1px solid var(--border);padding:8px 10px}
table.kv td:first-child{color:var(--muted);width:40%;background:#f8fafc}

/* ===== Responsive ===== */
@media (max-width:1180px){
  .layout{grid-template-columns:var(--sidebar-w) minmax(0,1fr)}
  .ad-rail{display:none}
}
@media (max-width:860px){
  .layout{grid-template-columns:1fr}
  .menu-btn{display:block}
  .header-links{display:none}
  .sidebar{position:fixed;left:0;top:62px;bottom:0;width:270px;z-index:40;border-radius:0;max-height:none;transform:translateX(-100%);transition:.25s}
  .sidebar.open{transform:translateX(0);box-shadow:0 0 40px rgba(0,0,0,.2)}
  .backdrop{display:none;position:fixed;inset:62px 0 0 0;background:rgba(0,0,0,.3);z-index:39}
  .backdrop.show{display:block}
}