@keyframes _si{to{opacity:1}}

.legacy-content .lesson {--accent:#b45309;--accent-deep:#7c3d06;--accent-soft:rgba(180,83,9,.085)}.legacy-content .lesson-header {position:relative;overflow:hidden}.legacy-content .lesson-header:after {content:"";position:absolute;right:-70px;top:-70px;width:220px;height:220px;border:1px solid rgba(180,83,9,.22);border-radius:50%;box-shadow:0 0 0 26px rgba(180,83,9,.04),0 0 0 52px rgba(180,83,9,.025)}.legacy-content .lesson>p {font-size:15px;line-height:2;margin:0 0 20px}.legacy-content .lesson strong {font-weight:700;color:var(--accent-deep)}.legacy-content .lesson mark {background:rgba(180,83,9,.14);color:var(--accent-deep);font-weight:700;padding:2px 5px;border-radius:5px;box-decoration-break:clone;-webkit-box-decoration-break:clone}.legacy-content .lesson .clause {display:block;margin:6px 0;padding:14px 18px;background:var(--accent-soft);border-radius:10px;font-size:14.5px;line-height:1.95;color:var(--text)}.legacy-content ol.four {margin:0 0 20px;padding:0;list-style:none;counter-reset:f}.legacy-content ol.four li {counter-increment:f;position:relative;padding-left:32px;margin-bottom:12px;font-size:15px;line-height:2}.legacy-content ol.four li:last-child {margin-bottom:0}.legacy-content ol.four li:before {content:counter(f);position:absolute;left:0;top:5px;width:20px;height:20px;border-radius:50%;background:var(--accent-soft);border:1px solid rgba(180,83,9,.3);color:var(--accent-deep);font-size:11px;font-weight:800;display:flex;align-items:center;justify-content:center}.legacy-content ol.four li b {font-weight:700;color:var(--accent-deep)}.legacy-content .lesson .sec-label {margin:56px 0 20px}.legacy-content .key-line {margin:32px 0;padding:24px;border-radius:14px;background:var(--accent-soft);border:1px solid rgba(180,83,9,.25);text-align:center;font-size:18px;font-weight:800;line-height:1.8;color:var(--accent-deep)}.legacy-content .tpl {background:var(--card);border:1px dashed rgba(180,83,9,.42);border-radius:12px;padding:24px 26px;margin:0 0 20px}.legacy-content .tpl>span {display:block;font-size:11.5px;font-weight:700;letter-spacing:.4px;color:var(--accent-deep);margin-bottom:16px}.legacy-content .tpl ol {margin:0;padding:0;list-style:none;counter-reset:tpl}.legacy-content .tpl li {counter-increment:tpl;position:relative;padding-left:34px;margin-bottom:18px}.legacy-content .tpl li:last-child {margin-bottom:0}.legacy-content .tpl li:before {content:counter(tpl);position:absolute;left:0;top:1px;width:21px;height:21px;border-radius:50%;background:var(--accent-soft);border:1px solid rgba(180,83,9,.3);color:var(--accent-deep);font-size:11px;font-weight:800;display:flex;align-items:center;justify-content:center}.legacy-content .tpl li b {display:block;font-size:12.5px;font-weight:700;color:var(--accent-deep);margin-bottom:5px}.legacy-content .tpl li q {display:block;quotes:"“" "”";font-size:13.5px;line-height:1.95;color:var(--text)}.legacy-content .tpl-note {font-size:13px;line-height:1.9;color:var(--muted);margin:22px 0 0;padding:13px 16px;background:var(--accent-soft);border-radius:8px}.legacy-content .demo {background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-card)}.legacy-content .demo-top {display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:20px}.legacy-content .demo-title {font-size:14px;font-weight:700;color:var(--text)}.legacy-content .demo-ctrl {display:flex;gap:12px;flex-wrap:wrap}.legacy-content .demo-ctrl button {display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 20px;min-height:44px;min-width:44px;border:1px solid rgba(180,83,9,.35);border-radius:999px;background:var(--accent-soft);color:var(--accent-deep);font:600 14px/1 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;cursor:pointer;transition:filter .15s cubic-bezier(.4,0,.2,1)}.legacy-content .demo-ctrl button:active {filter:brightness(.92)}.legacy-content .dm-sw {display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}.legacy-content .dm-sw button {display:flex;align-items:flex-start;justify-content:space-between;gap:14px;min-height:64px;padding:16px 18px;border-radius:12px;border:1px solid var(--border);background:var(--bg);color:var(--text);font:700 13px/1.5 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;cursor:pointer;text-align:left;opacity:.56;transform:scale(.985);transition:all .35s cubic-bezier(.4,0,.2,1)}.legacy-content .dm-sw-copy {display:flex;flex-direction:column;align-items:flex-start;gap:7px;min-width:0}.legacy-content .dm-sw-tpl {font:500 12.5px/1.75 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;color:var(--sub);transition:color .3s cubic-bezier(.4,0,.2,1)}.legacy-content .dm-sw.idle button, .legacy-content .dm-sw button.on, .legacy-content .dm-sw button.fresh {opacity:1;transform:scale(1)}.legacy-content .dm-sw button.on {background:var(--accent-soft);border-color:rgba(180,83,9,.4);color:var(--accent-deep)}.legacy-content .dm-sw button.on .dm-sw-tpl {color:var(--accent-deep)}.legacy-content .dm-knob-wrap {flex:0 0 36px;width:36px;height:20px;margin-top:2px;border-radius:999px;background:rgba(0,0,0,.12);position:relative;transition:background .3s cubic-bezier(.4,0,.2,1)}.legacy-content .dm-sw button.on .dm-knob-wrap {background:var(--accent)}.legacy-content .dm-knob {position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;transition:transform .25s cubic-bezier(.4,0,.2,1)}.legacy-content .dm-sw button.on .dm-knob {transform:translateX(16px)}.legacy-content .dm-meter {height:4px;border-radius:999px;background:var(--border);margin:0 0 18px;overflow:hidden}.legacy-content .dm-meter-fill {display:block;height:100%;width:0;background:var(--accent);border-radius:999px;transition:width .6s cubic-bezier(.25,1,.5,1)}.legacy-content .dm-live {position:relative;padding:16px 18px;border-radius:12px;background:var(--bg);border:1px solid var(--border);margin-bottom:20px}.legacy-content .dm-note-tag {display:block;font-size:11px;font-weight:800;letter-spacing:.6px;color:var(--accent-deep);margin-bottom:8px}.legacy-content .dm-lines {position:relative;min-height:30px}.legacy-content .dm-line {font-size:13.5px;line-height:1.9;color:var(--text);overflow:hidden;max-height:0;opacity:0;transform:translateY(8px);transition:max-height .4s cubic-bezier(.25,1,.5,1),opacity .35s cubic-bezier(.25,1,.5,1),transform .35s cubic-bezier(.25,1,.5,1)}.legacy-content .dm-line.show {max-height:110px;opacity:1;transform:none}.legacy-content .dm-ghost {position:absolute;margin:0;pointer-events:none;max-height:110px;transition:opacity .38s cubic-bezier(.25,1,.5,1),transform .38s cubic-bezier(.25,1,.5,1)}.legacy-content .dm-ghost.gone {opacity:0;transform:translateY(-10px)}@keyframes flashPop{0%{transform:scale(.8)}30%{transform:scale(1.15)}100%{transform:scale(1)}}@keyframes fireGlow{0%{box-shadow:0 0 0 0 rgba(180,83,9,.3)}50%{box-shadow:0 0 20px 6px rgba(180,83,9,.2)}100%{box-shadow:none}}@keyframes softPulse{0%,100%{opacity:1}50%{opacity:.58}}.legacy-content .dm-live.glow {animation:fireGlow .9s ease}.legacy-content .dm-compare {display:grid;grid-template-columns:1fr 1fr;gap:20px}.legacy-content .dm-cmp-col {border:1px solid var(--border);border-radius:12px;background:var(--bg);overflow:hidden;min-width:0;transition:border-color .3s cubic-bezier(.4,0,.2,1),background .3s cubic-bezier(.4,0,.2,1)}.legacy-content .dm-cmp-col.live {border-color:rgba(180,83,9,.3)}.legacy-content .dm-cmp-h {padding:14px 16px;background:var(--card);border-bottom:1px solid var(--border);font-size:13px;font-weight:800;color:var(--text)}.legacy-content .dm-pane {padding:16px 18px;font-size:13.5px;line-height:1.9;color:var(--text);min-height:212px;overflow-wrap:anywhere;word-break:break-word}.legacy-content .dm-empty {color:var(--sub);font:13px/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif}.legacy-content .dm-enter {opacity:0;transform:translateY(10px)}.legacy-content .dm-enter.show {opacity:1;transform:none;transition:opacity .4s cubic-bezier(.25,1,.5,1),transform .4s cubic-bezier(.25,1,.5,1)}.legacy-content .dm-blk {max-height:0;overflow:hidden;padding:0 12px;margin:0 0 10px;border-radius:10px;background:var(--card);border:1px solid var(--border);opacity:.2;transition:max-height .5s cubic-bezier(.25,1,.5,1),padding .4s cubic-bezier(.25,1,.5,1),opacity .45s cubic-bezier(.25,1,.5,1)}.legacy-content .dm-blk.open {max-height:220px;padding:12px;opacity:1}.legacy-content .dm-blk:last-child {margin:0}.legacy-content .dm-blk b {display:block;font-size:12px;color:var(--accent-deep);margin-bottom:5px}.legacy-content .dm-blk span {display:block;font-size:13px;line-height:1.85;color:var(--text)}.legacy-content .dm-blk.add {background:var(--accent-soft);border-color:rgba(180,83,9,.3)}.legacy-content .dm-blk.pop {animation:flashPop .8s ease;transform-origin:center top}.legacy-content .dm-blk.dim b {color:var(--sub)}.legacy-content .dm-blk.dim span {color:var(--sub);animation:softPulse 1.6s ease infinite}.legacy-content .dm-caption {margin-top:20px;min-height:56px;display:flex;align-items:center;gap:12px;padding:16px 18px;border-radius:10px;background:var(--accent-soft);border:1px solid rgba(180,83,9,.22);font-size:14px;line-height:1.8;color:var(--text)}.legacy-content .dm-caption svg {flex:0 0 auto;color:var(--accent)}.legacy-content .demo-caption {font-size:11.5px;color:var(--sub);margin-top:14px;line-height:1.7}@media(max-width:760px){.legacy-content .lesson {overflow-x:hidden}.legacy-content .dm-compare, .legacy-content .dm-sw {grid-template-columns:1fr}.legacy-content .lesson-header:after {display:none}.legacy-content .demo {padding:18px}.legacy-content .demo-ctrl {width:100%}.legacy-content .demo-ctrl button {flex:1}.legacy-content .demo {max-width:100%;min-width:0}.legacy-content .lesson code {overflow-wrap:anywhere;word-break:break-word}}@media(prefers-reduced-motion:reduce){.legacy-content .dm-sw button, .legacy-content .dm-knob, .legacy-content .dm-knob-wrap, .legacy-content .dm-meter-fill, .legacy-content .dm-line, .legacy-content .dm-ghost, .legacy-content .dm-enter, .legacy-content .dm-enter.show, .legacy-content .dm-blk, .legacy-content .dm-cmp-col, .legacy-content .dm-sw-tpl {transition-duration:0s;animation-duration:0s;animation-iteration-count:1}}

.legacy-content .xa-tldr {margin:18px 0 4px;padding:14px 18px;background:rgba(0,102,255,0.04);border:1px solid rgba(0,102,255,0.16);border-radius:10px}.legacy-content .xa-tldr .xa-tldr-tag {display:block;font-size:11px;font-weight:800;letter-spacing:1px;color:var(--accent,#0066ff);margin-bottom:6px}.legacy-content .xa-tldr p {margin:0;font-size:15px;line-height:1.8;color:var(--text,#1f2937)}