/* 新伦智算 - 修复版 - 每行固定4个 */
:root{--primary:#0B6BFF;--bg:#f5f7fb;--card:#fff;--text:#1e293b;--muted:#64748b;--border:#e2e8f0}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC",sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
.header{background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
.header-inner{max-width:1200px;margin:0 auto;padding:0 20px;height:62px;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:20px;font-weight:800;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:6px}
.nav{display:flex;align-items:center;gap:18px}
.nav a{color:var(--text);text-decoration:none;font-size:14px;padding:6px 10px;border-radius:8px}
.nav a.active,.nav a:hover{background:#eff6ff;color:var(--primary)}
.nav-toggle{display:none;background:none;border:none;font-size:22px;cursor:pointer}
.lang-btn{background:#f1f5f9;border:1px solid var(--border);padding:6px 10px;border-radius:8px;font-size:12px;cursor:pointer}
.container-wide{max-width:1200px;margin:0 auto;padding:28px 20px}
h1{font-size:26px;font-weight:800;letter-spacing:.2px}
.subtitle{font-size:14px;color:var(--muted);margin-top:8px;font-weight:400;line-height:1.7}
/* 核心：每行固定4个 */
.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:24px}
.calc-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px 16px;text-decoration:none;color:var(--text);transition:all .2s ease;position:relative;overflow:hidden;display:flex;flex-direction:column;gap:8px;min-height:118px}
.calc-card:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(11,107,255,.12);border-color:#c7d2fe}
.calc-card .icon{font-size:26px;line-height:1}
.calc-card h2{font-size:15px;font-weight:700;margin:0}
.calc-card p{font-size:12px;color:var(--muted);line-height:1.5;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.footer{margin-top:40px;padding:20px;text-align:center;font-size:12px;color:#94a3b8;border-top:1px solid #f1f5f9}
.footer a{color:inherit}
@media(max-width:1024px){
  .calc-grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:768px){
  .nav{display:none;position:absolute;top:62px;left:0;right:0;background:#fff;flex-direction:column;padding:12px 20px;box-shadow:0 8px 20px rgba(0,0,0,.08)}
  .nav.open{display:flex}
  .nav-toggle{display:block}
  h1{font-size:22px}
  .calc-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .calc-card{min-height:110px;padding:14px 12px}
  .calc-card h2{font-size:13px}
  .calc-card p{font-size:11px}
}
@media(max-width:480px){
  .calc-grid{grid-template-columns:repeat(2,1fr);gap:8px}
}