@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 .lesson .clause mark {background:rgba(180,83,9,.24)}.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-copy {margin:0;font-size:14px;line-height:2;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}.legacy-content .demo-ctrl button:active {filter:brightness(.92)}.legacy-content .dm-src {margin-bottom:20px;padding:18px 20px;border-radius:12px;background:var(--bg);border:1px solid var(--border)}.legacy-content .dm-src b {display:block;font-size:12.5px;color:var(--accent-deep);margin-bottom:8px}.legacy-content .dm-src p {margin:0;font-size:13px;line-height:2;color:var(--text)}.legacy-content .dm-src .dm-w {padding:0 2px;border-radius:4px;transition:background .6s cubic-bezier(.25,1,.5,1),color .6s cubic-bezier(.25,1,.5,1)}.legacy-content .dm-src .dm-w.lit {background:rgba(220,38,38,.09);color:var(--danger);font-weight:700}.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}.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;min-height:300px;overflow-wrap:anywhere;word-break:break-word}.legacy-content .dm-meter {display:flex;gap:18px;flex-wrap:wrap;margin-bottom:12px}.legacy-content .dm-m {display:flex;align-items:baseline;gap:6px}.legacy-content .dm-m b {font-size:26px;font-weight:900;color:var(--accent-deep);display:inline-block;font-variant-numeric:tabular-nums;transition:color .35s cubic-bezier(.4,0,.2,1)}.legacy-content .dm-m span {font-size:12px;color:var(--sub)}.legacy-content .dm-m b.pop {animation:flashPop .8s ease}@keyframes flashPop{0%{transform:scale(.8)}30%{transform:scale(1.15)}100%{transform:scale(1)}}.legacy-content .dm-track {height:6px;border-radius:99px;background:var(--border);margin:0 0 14px;overflow:hidden}.legacy-content .dm-bar {height:100%;width:0;background:var(--accent);border-radius:99px;transition:width .8s cubic-bezier(.25,1,.5,1)}.legacy-content #dm-col-l.stuck .dm-bar {background:var(--danger);animation:stuckPulse 1.4s ease infinite}.legacy-content #dm-col-l.stuck .dm-m b {color:var(--danger)}@keyframes stuckPulse{0%,100%{opacity:1}50%{opacity:.45}}.legacy-content .dm-chips {display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px;min-height:26px}.legacy-content .dm-chip {padding:5px 11px;border-radius:999px;font-size:12px;font-weight:700;background:rgba(220,38,38,.06);color:var(--danger);border:1px solid rgba(220,38,38,.22);opacity:0;transform:translateY(8px)}.legacy-content .dm-chip.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-chip.pop {animation:flashPop .8s ease}.legacy-content .dm-order {display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}.legacy-content .dm-o {padding:5px 10px;border-radius:8px;font-size:12px;font-weight:700;color:var(--faint);background:var(--card);border:1px dashed var(--border);transition:all .4s cubic-bezier(.25,1,.5,1)}.legacy-content .dm-o.on {color:#fff;background:var(--accent);border-color:var(--accent);border-style:solid}.legacy-content .dm-list {display:flex;flex-direction:column;gap:8px;margin-bottom:12px}.legacy-content .dm-c {padding:9px 12px;border-radius:10px;background:var(--card);border:1px solid var(--border);opacity:.4;transform:scale(.98);transition:opacity .35s cubic-bezier(.4,0,.2,1),transform .35s cubic-bezier(.4,0,.2,1),background .4s ease,border-color .4s ease}.legacy-content .dm-c.active {opacity:1;transform:scale(1)}.legacy-content .dm-c-n {font-size:13px;font-weight:700;color:var(--text);transition:color .4s ease}.legacy-content .dm-c-s {font-size:11.5px;color:var(--sub);margin-left:8px}.legacy-content .dm-c.ok {background:rgba(22,163,74,.07);border-color:rgba(22,163,74,.28)}.legacy-content .dm-c.ok .dm-c-n {color:var(--faint);text-decoration:line-through}.legacy-content .dm-c.ok .dm-c-s {color:var(--success)}.legacy-content .dm-c.gap {background:var(--accent-soft);border-color:rgba(180,83,9,.32)}.legacy-content .dm-c.gap .dm-c-s {color:var(--accent-deep);font-weight:700}.legacy-content .dm-c.pop {animation:flashPop .8s ease}.legacy-content .dm-c.glow {animation:fireGlow .9s ease}@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}}.legacy-content .dm-c-b {max-height:0;overflow:hidden;font-size:12px;line-height:1.8;color:var(--accent-deep);transition:max-height .5s cubic-bezier(.25,1,.5,1),padding .4s cubic-bezier(.25,1,.5,1)}.legacy-content .dm-c-b.open {max-height:110px;padding:6px 0 2px}.legacy-content .dm-note {font-size:12.5px;line-height:1.8;color:var(--sub)}.legacy-content .dm-note.warn {color:var(--danger);font-weight:700}.legacy-content .dm-note.good {color:var(--success);font-weight:700}.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 .dm-summary {display:flex;flex-direction:column;gap:14px;max-height:0;overflow:hidden;opacity:0;margin-top:0;padding:0 22px;border:1px solid transparent;border-radius:12px;background:linear-gradient(135deg,var(--accent-soft),var(--card));transition:max-height .5s cubic-bezier(.25,1,.5,1),opacity .4s cubic-bezier(.25,1,.5,1),padding .4s cubic-bezier(.25,1,.5,1),margin-top .4s cubic-bezier(.25,1,.5,1)}.legacy-content .dm-summary.on {max-height:240px;opacity:1;margin-top:20px;padding:20px 22px;border-color:rgba(180,83,9,.3)}.legacy-content .dm-summary .dm-s {font-size:13px;line-height:1.8;color:var(--sub)}.legacy-content .dm-summary .dm-s b {display:block;font-size:13.5px;color:var(--accent-deep);margin-bottom:2px}.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 {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 .dm-pane {min-height:0}}@media(prefers-reduced-motion:reduce){.legacy-content .dm-bar, .legacy-content .dm-c, .legacy-content .dm-o, .legacy-content .dm-chip, .legacy-content .dm-chip.show, .legacy-content .dm-c-b, .legacy-content .dm-summary, .legacy-content .dm-src .dm-w, .legacy-content .dm-m b {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)}