/* 培训 03：继承 001/002 的主题，以“流程编排台”为视觉主线。 */
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.gateway-stage{display:grid;grid-template-columns:1fr 1.18fr 1fr;gap:24px;align-items:stretch;margin-top:20px}.gateway-side{display:grid;gap:14px}.gateway-side .card{min-height:108px;text-align:left}.gateway-side h3{font-size:23px}.gateway-side .card p{font-size:18px}.gateway-core{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px!important;color:#fff;background:linear-gradient(145deg,#0b7c72,#0891b2);border:none!important;box-shadow:0 20px 45px rgba(8,145,178,.28)!important}.gateway-core h3{font-size:42px;color:#fff;margin:8px 0}.gateway-core p{font-size:21px!important;color:#d9fffb}.gateway-core .tag{color:#d9fffb;background:rgba(255,255,255,.14)}.gateway-core::before,.gateway-core::after{content:'↔';position:absolute;top:125px;font-size:32px;color:var(--teal)}.gateway-core::before{left:-28px}.gateway-core::after{right:-28px}.route-flow{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin-top:26px}.route-step{position:relative;text-align:left;min-height:168px}.route-step:not(:last-child)::after{content:'→';position:absolute;right:-24px;top:65px;color:var(--teal);font-size:30px}.route-step .route-no{display:block;font-size:15px;font-weight:800;letter-spacing:.1em;color:var(--cyan);margin-bottom:10px}.route-step p{font-size:19px!important}.return-line{margin:15px auto 0;width:72%;border-top:2px dashed rgba(13,148,136,.45);padding-top:9px;font-size:17px;color:var(--ink-soft)}