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(width<=900px){.courseware-topbar{grid-template-columns:72px minmax(100px,1fr) auto;gap:4px;padding:0 7px}.course-brand img{width:62px}.day-tabs a{gap:7px;min-width:0;padding:0 8px}.day-tabs a span{text-overflow:ellipsis;white-space:nowrap;max-width:104px;overflow:hidden}.top-actions{gap:4px}.top-actions button{width:30px;padding:0;font-size:0;overflow:hidden}.top-actions button:first-letter{font-size:12px}.courseware-controls{grid-template-columns:38px 1fr auto 38px;gap:8px;bottom:10px}.slide-status,.step-track{display:none}.overview-grid{grid-template-columns:repeat(2,1fr)}}:root{--stage-bg:#d5dfdf;--slide-bg:#f7f9f7;--paper:#f7f9f7;--paper-solid:#fff;--ink:#142d36;--ink-2:#4c6670;--ink-faint:#142d362e;--grid:#142d3611;--accent:#0d9eaa;--accent-deep:#08717b;--accent-soft:#e2f4f2;--warm:var(--accent);--warm-soft:var(--accent-soft);--font-display:"Noto Sans SC", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;--font-body:"Noto Sans SC", "PingFang SC", "Microsoft YaHei", Arial, 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span{color:#142d366b;align-items:center;gap:8px;min-width:92px;display:inline-flex;position:relative}.trace-steps span:not(:last-child):after{content:"";background:#142d3638;width:28px;height:1px;margin:0 12px}.trace-steps span.is-done{color:var(--ink)}.trace-steps span.is-done i{color:var(--paper-solid);background:var(--accent-deep)}.trace-steps i{border:1px solid #142d3647;place-items:center;width:23px;height:23px;font-size:11px;font-style:normal;display:grid}.editorial-topbar{border-bottom:1px solid var(--ink);gap:42px;min-height:150px;padding-bottom:20px}.editorial-topbar span{letter-spacing:.04em}.editorial-topbar h1{font:700 60px/1.2 var(--font-display);margin-top:14px}.editorial-topbar>b{color:var(--accent-deep);background:var(--accent-soft);border:1px solid #0d9eaa59;padding:9px 12px}.slide-cover{background:linear-gradient(90deg, var(--paper) 0 56%, var(--accent-soft) 56% 100%)}.cover-copy{width:890px;top:180px;left:112px}.cover-kicker{gap:16px;font-size:20px}.cover-kicker 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