:root{
  --bg:#f6f8fc; --card:#ffffff; --ink:#0f172a; --sub:#64748b;
  --brand:#4f46e5; --brand2:#06b6d4; --line:#e2e8f0; --ok:#16a34a;
  --warn:#f59e0b; --shadow:0 8px 30px rgba(15,23,42,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.85);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px}
.logo .dot{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand2));
  display:grid;place-items:center;color:#fff;font-size:16px}
.nav a.link{color:var(--sub);font-size:14px;margin-left:22px}
.nav a.link:hover{color:var(--ink)}
.pill{background:#dcfce7;color:var(--ok);font-size:12px;font-weight:700;padding:5px 12px;border-radius:999px}
.btn{border:none;cursor:pointer;font-weight:600;border-radius:10px;padding:10px 18px;font-size:14px;transition:.2s}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{background:#4338ca}
.btn-ghost{background:#eef2ff;color:var(--brand)}
.btn-ghost:hover{background:#e0e7ff}
.hero{padding:56px 0 36px;text-align:center;
  background:radial-gradient(1200px 400px at 50% -10%,rgba(79,70,229,.12),transparent)}
.hero h1{font-size:38px;line-height:1.25;font-weight:800;letter-spacing:-.5px}
.hero h1 .g{background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--sub);font-size:17px;max-width:640px;margin:16px auto 24px}
.hero .cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.stats{display:flex;gap:28px;justify-content:center;margin-top:30px;color:var(--sub);font-size:13px;flex-wrap:wrap}
.stats b{display:block;font-size:22px;color:var(--ink)}
section{padding:44px 0}
.sec-head{text-align:center;margin-bottom:28px}
.sec-head h2{font-size:27px;font-weight:800}
.sec-head p{color:var(--sub);margin-top:8px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:880px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.grid{grid-template-columns:1fr}}
.tool{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;cursor:pointer;
  box-shadow:var(--shadow);transition:.18s;position:relative;display:block}
.tool:hover{transform:translateY(-3px);border-color:#c7d2fe}
.tool .ic{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-size:20px;
  background:#eef2ff;margin-bottom:10px}
.tool h3{font-size:16px}
.tool p{color:var(--sub);font-size:13px;margin-top:4px}
.free-tag{position:absolute;top:14px;right:14px;font-size:11px;font-weight:700;padding:3px 8px;border-radius:999px;background:#dcfce7;color:var(--ok)}
.panel{display:none;background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:20px;margin-top:14px;box-shadow:var(--shadow);max-width:820px}
.panel.open{display:block;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.panel .ph{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.panel .ph h3{font-size:18px}
.panel .close{cursor:pointer;color:var(--sub);font-size:22px;line-height:1}
textarea,input,select{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;
  font-size:14px;font-family:inherit;background:#fbfcfe;color:var(--ink)}
textarea{resize:vertical;min-height:120px}
label{font-size:13px;color:var(--sub);display:block;margin:10px 0 5px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.row>*{flex:1}
.mini{font-size:13px;padding:8px 14px}
.out{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:12px;font-size:13px;
  white-space:pre-wrap;word-break:break-all;min-height:48px;margin-top:8px;font-family:ui-monospace,Menlo,Consolas,monospace}
.out.ok{background:#052e16;color:#bbf7d0}
.out.err{background:#450a0a;color:#fecaca}
.sharebar{display:flex;gap:10px;margin-top:14px;padding-top:14px;border-top:1px dashed var(--line)}
.sharebar .btn{flex:1}
.ad{background:repeating-linear-gradient(45deg,#fff,#fff 12px,#f8fafc 12px,#f8fafc 24px);
  border:1px dashed #cbd5e1;border-radius:14px;padding:22px;text-align:center;color:#94a3b8;font-size:13px}
.ad b{color:#64748b}
.ad-top{margin:0 auto 26px;max-width:900px}
.why{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;box-shadow:var(--shadow);max-width:760px;margin:0 auto}
.why h3{font-size:19px;margin-bottom:10px}
.why ul{list-style:none}
.why li{padding:8px 0;color:var(--sub);font-size:15px;display:flex;gap:10px}
.why li::before{content:"✓";color:var(--ok);font-weight:700}
.road{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.road-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:760px){.road-grid{grid-template-columns:1fr}}
.road-card{background:#faf5ff;border:1px solid #e9d5ff;border-radius:14px;padding:16px}
.road-card h3{font-size:15px;color:#7c3aed}
.road-card p{color:var(--sub);font-size:13px;margin-top:6px}
.about{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;box-shadow:var(--shadow);max-width:820px;margin:0 auto}
.about h3{font-size:18px;margin:14px 0 6px}
.about p{color:var(--sub);font-size:14px}
footer{border-top:1px solid var(--line);padding:30px 0;color:var(--sub);font-size:13px;text-align:center}
footer a{color:var(--brand);margin:0 8px}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#0f172a;color:#fff;
  padding:12px 20px;border-radius:10px;font-size:14px;opacity:0;transition:.3s;z-index:60;pointer-events:none}
.toast.show{opacity:1}
.qr{display:grid;place-items:center;margin-top:10px;min-height:140px}
/* 工具页专用 */
.toolpage{padding:40px 0}
.backlink{display:inline-block;color:var(--sub);font-size:14px;margin-bottom:14px}
.backlink:hover{color:var(--brand)}
.tut{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--shadow);max-width:820px;margin:22px auto 0}
.tut h3{font-size:18px;margin:14px 0 6px}
.tut p{color:var(--sub);font-size:14px;line-height:1.7}
.tut code{background:#eef2ff;color:var(--brand);padding:1px 6px;border-radius:5px;font-size:13px}