:root{
  --blue:#1a4d8f;
  --blue-dark:#16335c;
  --blue-light:#2f6fc0;
  --gold:#e8b84b;
  --text:#2a2f38;
  --muted:#5b6675;
  --bg:#eef3f9;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Microsoft YaHei","Segoe UI",sans-serif;color:var(--text);background:#fff;line-height:1.78;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}

/* 顶部 slim 页眉 */
.case-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;height:64px;padding:0 24px;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);box-shadow:0 1px 0 rgba(0,0,0,.06)}
.case-logo{font-size:20px;font-weight:800;color:var(--blue);letter-spacing:1px}
.case-header nav a{font-size:14px;color:var(--muted);padding:8px 14px;border:1px solid #dce5f0;border-radius:20px;transition:.2s}
.case-header nav a:hover{background:var(--blue);color:#fff;border-color:var(--blue)}

/* hero 横幅 */
.case-hero{position:relative;height:420px;background-size:cover;background-position:center;display:flex;align-items:center;justify-content:center;text-align:center}
.case-hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(22,51,92,.5),rgba(15,35,66,.84))}
.case-hero-content{position:relative;z-index:2;padding:0 20px;color:#fff}
.case-hero-content h1{font-size:46px;font-weight:800;letter-spacing:3px;text-shadow:0 2px 12px rgba(0,0,0,.4)}
.case-hero-content p{margin-top:14px;font-size:18px;color:rgba(255,255,255,.92);max-width:700px;margin-left:auto;margin-right:auto}

/* 正文 */
.case-main{max-width:880px;margin:0 auto;padding:56px 20px 40px}
.case-section{margin-bottom:40px}
.case-section h2{font-size:26px;color:var(--blue);margin-bottom:16px;padding-left:14px;border-left:4px solid var(--gold);line-height:1.3}
.case-section p{font-size:16px;color:var(--text);margin-bottom:14px}
.case-section ul{list-style:none;padding:0}
.case-section ul li{position:relative;padding:11px 0 11px 28px;font-size:16px;border-bottom:1px solid #eef1f6}
.case-section ul li:before{content:"";position:absolute;left:6px;top:19px;width:8px;height:8px;border-radius:50%;background:var(--blue-light)}

/* 方案图文块（上图下文） */
.sol-block{margin:22px 0}
.sol-img{display:block;width:100%;max-width:720px;margin:0 auto 16px;border-radius:12px;box-shadow:0 6px 22px rgba(22,51,92,.18);border:1px solid #dce5f0}
.sol-block p{margin:0}

/* 结尾联系块 */
.case-contact{margin:48px 0 8px;padding:28px 26px;background:linear-gradient(135deg,#eaf1fb,#f6f9fd);border:1px solid #d6e3f5;border-left:4px solid var(--blue);border-radius:10px}
.case-contact p{font-size:17px;color:var(--blue-dark);font-weight:600;margin:0}
.case-contact .case-contact-sub{font-weight:400;font-size:14px;color:var(--muted);margin-top:8px}

/* 页脚（合规双备案号） */
.case-footer{background:var(--blue-dark);color:rgba(255,255,255,.55);padding:30px 20px;text-align:center;font-size:13px}
.case-footer .footer-brand{font-size:16px;font-weight:700;color:#fff;margin-bottom:4px}
.case-footer p{margin:4px 0}
.case-footer a{color:rgba(255,255,255,.6);text-decoration:none;display:inline-flex;align-items:center;gap:4px}
.case-footer .sep{margin:0 10px;opacity:.5}

@media(max-width:600px){
  .case-hero{height:300px}
  .case-hero-content h1{font-size:32px}
  .case-hero-content p{font-size:15px}
  .case-main{padding:40px 16px 30px}
  .case-section h2{font-size:22px}
}