:root{--text:#6b6375;--text-h:#08060d;--bg:#fff;--border:#e5e4e7;--code-bg:#f4f3ec;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media (width<=1024px){:root{font-size:16px}}@media 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8px;font-size:15px;line-height:135%}:root{--teal:#0d9488;--green:#059669;--red:#dc2626;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--bg:#f0fdfa;--card:#fff}*{box-sizing:border-box;margin:0;padding:0}body{background:radial-gradient(circle at 12% 6%, #0d94881a, transparent 38%), radial-gradient(circle at 88% 96%, #0596691a, transparent 42%), var(--bg);color:var(--ink);min-height:100vh;font-family:-apple-system,PingFang HK,Microsoft JhengHei,sans-serif;line-height:1.5}.center{justify-content:center;align-items:center;min-height:100vh;display:flex}.muted{color:var(--muted)}.hint{color:var(--muted);margin-top:14px;font-size:11px;line-height:1.7}.wrap{max-width:680px;margin:0 auto;padding:18px 16px 90px}.login-screen{justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.login-card{background:var(--card);border:1px solid var(--line);border-radius:24px;width:100%;max-width:420px;padding:36px 30px;box-shadow:0 24px 60px -20px 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.code{color:var(--muted);text-align:left;font-family:ui-monospace,monospace;font-size:12px}.page-title{letter-spacing:-.3px;margin-bottom:2px;font-size:21px;font-weight:800}.page-sub{color:var(--muted);margin-bottom:16px;font-size:13px}.section-label{letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:18px 0 10px;font-size:11px;font-weight:800}.center-text{text-align:center;padding:18px 0}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;margin-bottom:12px;padding:15px 17px}.row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.dot{border-radius:3px;flex-shrink:0;width:10px;height:10px}.course-head{flex-wrap:wrap;align-items:center;gap:9px;margin-bottom:6px;display:flex}.course-name{text-align:left;font-size:15px;font-weight:800}.item-row{border-top:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:10px;padding:11px 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#0009}.video-area{aspect-ratio:16/9;background:#000;justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.play-icon{color:#fff;background:#ffffff26;border-radius:50%;justify-content:center;align-items:center;width:64px;height:64px;font-size:26px;display:flex}.watermark{color:#ffffff4d;pointer-events:none;white-space:nowrap;text-shadow:0 1px 3px #00000080;font-size:13px;font-weight:700;animation:12s linear infinite drift;position:absolute}@keyframes drift{0%{top:12%;left:8%}25%{top:70%;left:60%}50%{top:40%;left:25%}75%{top:80%;left:10%}to{top:12%;left:8%}}.modal-foot{justify-content:space-between;align-items:center;gap:10px;padding:14px 18px;display:flex}.modal-title{color:#e2e8f0;text-align:left;font-size:14px;font-weight:700}.modal-note{color:#64748b;text-align:left;margin-top:2px;font-size:11px}.close-x{color:#fff;cursor:pointer;background:#ffffff1a;border:none;border-radius:8px;flex-shrink:0;width:30px;height:30px;font-size:16px}@media (width>=900px){html,body,#root{width:100%;min-height:100vh}#root{display:block}.wrap{box-sizing:border-box;width:100%;max-width:none;min-height:100vh;margin:0;padding:0 0 0 220px}.topbar{box-sizing:border-box;max-width:none;margin:0;padding:22px 22px 0}.layout{width:100%;display:block}.layout.has-rail{grid-template-columns:minmax(0,1fr) 360px;align-items:stretch;gap:0;width:100%;display:grid}.maincol{box-sizing:border-box;text-align:left;min-width:0;padding:18px 22px 90px}.rail{border-left:1px solid var(--line);box-sizing:border-box;min-height:100%;padding:18px 20px 90px}.rail .card{margin-bottom:10px}.rail .page-title,.rail .page-sub{display:none}.maincol>*,.rail>*,.section-label,.page-title,.page-sub,.item-name,.course-name{text-align:left}.back{margin:0 0 12px;padding:0}.bottomnav{border-top:none;border-right:1px solid var(--line);background:var(--card,#fff);flex-direction:column;justify-content:flex-start;align-items:stretch;gap:4px;width:220px;padding:0;inset:0 auto 0 0}.bottomnav:before{content:"⚗ Delta Chem";color:var(--teal);border-bottom:1px solid var(--line);margin-bottom:8px;padding:26px 22px 22px;font-size:17px;font-weight:800;display:block}.navbtn{text-align:left;border-radius:10px;flex-direction:row;flex:none;justify-content:flex-start;gap:12px;margin:0 10px;padding:13px 22px;font-size:14px}.navbtn:hover{background:#0d94880f}.navbtn.on{color:var(--teal);background:#0d94881a}.navbtn .ni{font-size:18px}}