:root{--bg:#f5f7fb;--panel:#fff;--ink:#101b31;--muted:#637089;--line:#dae3ef;--blue:#2463eb;--blue2:#1745b8;--green:#0f9f6e;--soft:#edf4ff;--soft2:#f8fbff;--shadow:0 10px 28px rgba(22,40,72,.08)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,"Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--ink);font-size:15px}a{color:inherit;text-decoration:none}
.site-header{height:60px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800}.mark{width:32px;height:32px;border-radius:8px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:900}
.nav{display:flex;gap:8px}.nav a{border:1px solid var(--line);border-radius:7px;padding:8px 11px;color:#526078;font-size:14px}.nav a:hover{background:var(--soft);color:var(--blue2)}
main{max-width:1180px;margin:0 auto;padding:24px}
.hero{display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:22px;align-items:center;margin:6px 0 18px}.hero h1{font-size:36px;line-height:1.14;margin:0 0 10px;letter-spacing:0}.lead{font-size:16px;line-height:1.7;color:var(--muted);margin:0}
.search-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px;box-shadow:var(--shadow)}.search-card input{width:100%;border:1px solid var(--line);border-radius:7px;padding:12px 13px;font:inherit}.hint{color:var(--muted);font-size:13px;line-height:1.65}.mini-trust{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:14px 0 20px}.mini-trust div{background:#fff;border:1px solid var(--line);border-radius:8px;padding:11px 13px}.mini-trust b{display:block;margin-bottom:3px}
.section-title{display:flex;align-items:end;justify-content:space-between;margin:20px 0 10px}.section-title h2{font-size:22px;margin:0}.section-title span{color:var(--muted);font-size:13px}
.hot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px;min-height:112px;display:flex;flex-direction:column;justify-content:space-between}.card:hover{border-color:#9bb8fb;box-shadow:var(--shadow);transform:translateY(-1px)}.card h3{font-size:16px;margin:0 0 8px}.card p{margin:0;color:var(--muted);line-height:1.55}.tag{display:inline-flex;align-self:flex-start;color:#08734f;background:#e8f8f1;border:1px solid #bde8d4;border-radius:999px;padding:2px 8px;font-size:12px;margin-bottom:10px}
.group-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 11px;color:#526078;cursor:pointer}.chip:hover,.chip.active{background:#20263a;color:#fff;border-color:#20263a}
.home-note,.faq{background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px;margin-top:18px}.home-note p,.faq p{color:var(--muted);line-height:1.7;margin:0 0 10px}
.tool-shell{display:grid;grid-template-columns:1fr 270px;gap:18px}.panel{background:#fff;border:1px solid var(--line);border-radius:8px;padding:20px;min-height:520px}.tool-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);padding-bottom:14px;margin-bottom:16px}.tool-head h1{font-size:34px;line-height:1.12;margin:0 0 8px}.tool-badge{color:#0b6b4f;background:#e8f8f1;border:1px solid #bde8d4;border-radius:999px;padding:5px 10px;font-size:13px;white-space:nowrap}
.related{background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px;align-self:start;position:sticky;top:78px}.related h2{font-size:15px;margin:4px 8px 8px}.related a{display:block;padding:10px 11px;border-radius:7px;color:#303a4f}.related a.active,.related a:hover{background:var(--soft);color:var(--blue2);font-weight:700}
.upload-zone{border:1px dashed #a7b5ca;background:var(--soft2);border-radius:8px;padding:18px;display:flex;align-items:center;justify-content:space-between;gap:12px;margin:12px 0}.upload-zone input[type=file]{position:absolute;opacity:0;pointer-events:none}.upload-copy b{display:block;margin-bottom:4px}.upload-copy span{color:var(--muted);font-size:13px}.upload-btn{display:inline-flex;align-items:center;justify-content:center;background:var(--blue);color:#fff;border-radius:7px;padding:10px 13px;font-weight:700;cursor:pointer;white-space:nowrap}
.row{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}textarea,input,select{border:1px solid var(--line);border-radius:7px;padding:10px 12px;font:inherit;background:#fff;color:var(--ink)}textarea{width:100%;min-height:190px;resize:vertical}
button.action{border:0;border-radius:7px;background:var(--blue);color:#fff;padding:10px 14px;cursor:pointer;font-weight:700}button.secondary{background:#eef1f5;color:#273044}button.green{background:var(--green)}button.orange{background:#d97706}
.out{background:#f8fafc;border:1px solid var(--line);border-radius:7px;padding:12px;white-space:pre-wrap;min-height:82px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:10px 0}.metric{background:#f8fafc;border:1px solid var(--line);border-radius:7px;padding:12px}.metric b{display:block;font-size:22px;margin-top:4px}
.preview{max-width:240px;max-height:170px;border:1px solid var(--line);border-radius:7px;margin-top:10px}.download{display:inline-block;margin-top:10px;background:var(--green);color:#fff;padding:9px 12px;border-radius:7px;font-weight:700}.warn{color:#9a3412;background:#fff7ed;border:1px solid #fed7aa;border-radius:7px;padding:10px;margin:10px 0}
footer{color:var(--muted);font-size:13px;margin:26px 0}.hidden{display:none}
@media(max-width:980px){.hero{grid-template-columns:1fr}.hot-grid,.tool-grid{grid-template-columns:repeat(2,1fr)}.tool-shell{grid-template-columns:1fr}.related{position:static}.mini-trust{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.site-header{padding:0 16px}.nav{display:none}main{padding:18px}.hero h1{font-size:30px}.hot-grid,.tool-grid{grid-template-columns:1fr}.mini-trust{grid-template-columns:repeat(2,1fr)}.tool-head{display:block}.tool-head h1{font-size:30px}.upload-zone{display:block}.upload-btn{margin-top:12px}.metrics{grid-template-columns:repeat(2,1fr)}}

/* wide-screen-tuning-start */
main{
  width:min(1560px, calc(100vw - 96px));
  max-width:none;
}

.hero{
  grid-template-columns:minmax(0, 1fr) 460px;
}

.hot-grid{
  grid-template-columns:repeat(4, minmax(0, 1fr));
}

.tool-grid{
  grid-template-columns:repeat(5, minmax(0, 1fr));
}

.card{
  min-height:116px;
}

.tool-shell{
  grid-template-columns:minmax(0, 1fr) 300px;
}

.panel{
  min-height:560px;
}

@media (min-width: 1700px){
  main{
    width:min(1680px, calc(100vw - 120px));
  }

  .hero{
    grid-template-columns:minmax(0, 1fr) 520px;
  }

  .tool-grid{
    grid-template-columns:repeat(6, minmax(0, 1fr));
  }

  .card{
    min-height:122px;
  }
}

@media (max-width: 1180px){
  main{
    width:auto;
    max-width:1180px;
  }

  .tool-grid{
    grid-template-columns:repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 980px){
  main{
    width:auto;
  }

  .hero{
    grid-template-columns:1fr;
  }

  .hot-grid,
  .tool-grid{
    grid-template-columns:repeat(2, minmax(0, 1fr));
  }

  .tool-shell{
    grid-template-columns:1fr;
  }
}

@media (max-width: 560px){
  .hot-grid,
  .tool-grid{
    grid-template-columns:1fr;
  }
}
/* wide-screen-tuning-end */