/* 下载页 · 频谱叠层横带 */
.dl-intro{padding:2rem 0 1.5rem;background:#fff}
.dl-intro h1{font-size:clamp(1.45rem,3.5vw,1.95rem);font-weight:900;margin-bottom:.5rem}
.dl-intro p{color:#555;max-width:580px;font-size:.94rem}

.spectrum-stack{padding:0 0 2.5rem}
.spec-band{display:grid;grid-template-columns:8px 1fr auto;align-items:center;gap:0;margin-bottom:3px;min-height:100px}
.spec-band .band-color{width:8px;align-self:stretch}
.spec-band .band-body{padding:1.25rem 1.5rem;display:grid;grid-template-columns:140px 1fr;gap:1.25rem;align-items:center;background:#fff;border:1px solid #eee;border-left:none}
.spec-band .band-action{padding:1.25rem 1.5rem;background:#fff;border:1px solid #eee;border-left:none;display:flex;align-items:center}
.spec-band.red .band-color{background:#e74c3c}
.spec-band.orange .band-color{background:#f39c12}
.spec-band.yellow .band-color{background:#f1c40f}
.spec-band.green .band-color{background:#2ecc71}
.spec-band img{border:2px solid #ddd;max-height:80px;object-fit:cover;width:100%}
.spec-band h2{font-size:1.05rem;margin-bottom:.3rem}
.spec-band p{font-size:.84rem;color:#666}
.btn-spec{display:inline-block;padding:.6rem 1.2rem;font-weight:800;font-size:.85rem;color:#fff!important;text-decoration:none!important;border-radius:4px;white-space:nowrap}
.btn-spec.r{background:#e74c3c}.btn-spec.o{background:#f39c12}
.btn-spec.y{background:#d4ac0d;color:#1a1a2e!important}.btn-spec.g{background:#2ecc71}

.dl-trust{padding:2rem 0;background:#f5f5f5;text-align:center}
.dl-trust-row{display:flex;justify-content:center;gap:2.5rem;flex-wrap:wrap}
.dl-trust-row strong{display:block;font-size:1.35rem;font-weight:900}
.dl-trust-row span{font-size:.82rem;color:#666}
.dl-trust-row div:nth-child(1) strong{color:#e74c3c}
.dl-trust-row div:nth-child(2) strong{color:#2ecc71}
.dl-trust-row div:nth-child(3) strong{color:#3498db}

.dl-faq{padding:2.5rem 0;background:#fff}
.faq-list{max-width:740px}
.faq-item{border:1px solid #ddd;margin-bottom:.4rem;background:#fafafa}
.faq-q{width:100%;text-align:left;background:#fff;border:none;border-left:6px solid #3498db;padding:1rem 1.15rem;font-size:.92rem;font-weight:700;cursor:pointer;display:flex;justify-content:space-between;color:#1a1a2e;font-family:inherit}
.faq-q::after{content:"+";color:#999}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{display:none;padding:0 1.15rem 1rem;font-size:.88rem;color:#555}
.faq-item.open .faq-a{display:block}

@media(max-width:768px){
  .spec-band{grid-template-columns:6px 1fr}
  .spec-band .band-body{grid-template-columns:1fr}
  .spec-band .band-action{border-top:none;padding-top:0}
}