@keyframes _si{to{opacity:1}}

.legacy-content .lesson-header {margin-bottom:20px}.legacy-content .hero-quote {text-align:center;padding:48px 20px 40px;margin-bottom:12px}.legacy-content .hero-quote .hq-text {font-size:32px;font-weight:900;color:var(--text);line-height:1.4;font-style:italic;max-width:680px;margin:0 auto}@media(max-width:768px){.legacy-content .hero-quote .hq-text {font-size:22px}}.legacy-content .hero-quote .hq-dash {width:48px;height:3px;background:var(--accent);margin:20px auto;border-radius:2px}.legacy-content .hero-quote .hq-source {font-size:14px;color:var(--sub);font-weight:600}.legacy-content .lesson-card {background:var(--card);border-radius:var(--radius);padding:28px 32px;box-shadow:var(--shadow-card);margin-top:20px;display:flex;gap:20px;align-items:flex-start;border:1.5px solid var(--border)}@media(max-width:768px){.legacy-content .lesson-card {flex-direction:column;padding:22px 20px}}.legacy-content .lesson-card .lc-num {flex-shrink:0;width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:900;color:#fff}.legacy-content .lesson-card:nth-of-type(1) .lc-num {background:var(--accent)}.legacy-content .lesson-card:nth-of-type(2) .lc-num {background:var(--purple)}.legacy-content .lesson-card:nth-of-type(3) .lc-num {background:var(--success)}.legacy-content .lesson-card .lc-body {flex:1}.legacy-content .lesson-card .lc-title {font-size:18px;font-weight:800;color:var(--text);margin-bottom:10px;line-height:1.4}.legacy-content .lesson-card .lc-desc {font-size:14px;color:var(--sub);line-height:1.8}.legacy-content .lesson-card .lc-detail {background:rgba(0,0,0,.03);border:1px dashed var(--border);border-radius:var(--radius-sm);padding:14px 16px;margin-top:12px;font-size:13px;color:var(--text);line-height:1.7}.legacy-content .lesson-card .lc-detail b {color:var(--accent)}.legacy-content .chapters-section {margin-top:48px;text-align:center}.legacy-content .chapters-section .cs-label {font-size:12px;font-weight:800;letter-spacing:2px;text-transform:uppercase;color:var(--accent);margin-bottom:14px}.legacy-content .chapters-section h3 {font-size:24px;font-weight:900;color:var(--text);margin-bottom:28px}@media(max-width:768px){.legacy-content .chapters-section h3 {font-size:20px}}.legacy-content .chapter-grid {display:grid;grid-template-columns:1fr 1fr;gap:18px}@media(max-width:768px){.legacy-content .chapter-grid {grid-template-columns:1fr}}.legacy-content .ch-card {background:var(--card);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-card);display:flex;flex-direction:column;gap:10px;position:relative;overflow:hidden;border:1.5px solid var(--border);text-align:left}.legacy-content .ch-card::before {content:'';position:absolute;top:0;left:0;bottom:0;width:4px}.legacy-content .ch-card:nth-child(1)::before {background:#3b82f6}.legacy-content .ch-card:nth-child(2)::before {background:#4f806b}.legacy-content .ch-card:nth-child(3)::before {background:#f59e0b}.legacy-content .ch-card:nth-child(4)::before {background:#10b981}.legacy-content .ch-card .cc-part {font-size:11px;font-weight:800;letter-spacing:1px;text-transform:uppercase}.legacy-content .ch-card:nth-child(1) .cc-part {color:#3b82f6}.legacy-content .ch-card:nth-child(2) .cc-part {color:#4f806b}.legacy-content .ch-card:nth-child(3) .cc-part {color:#f59e0b}.legacy-content .ch-card:nth-child(4) .cc-part {color:#10b981}.legacy-content .ch-card .cc-title {font-size:16px;font-weight:800;color:var(--text)}.legacy-content .ch-card .cc-desc {font-size:13px;color:var(--sub);line-height:1.7}.legacy-content .ending-section {margin-top:48px;text-align:center;padding:32px 20px}.legacy-content .ending-section .es-text {font-size:18px;font-weight:700;color:var(--text);line-height:1.7;max-width:680px;margin:0 auto 24px}@media(max-width:768px){.legacy-content .ending-section .es-text {font-size:15px}}.legacy-content .ending-section .es-highlight {color:var(--accent)}.legacy-content .credit-bar {background:linear-gradient(135deg,rgba(0,102,255,.04) 0%,rgba(124,58,237,.04) 100%);border:1.5px solid rgba(0,102,255,.12);border-radius:var(--radius);padding:20px 24px;margin-top:8px;text-align:center}.legacy-content .credit-bar .cb-title {font-size:13px;font-weight:700;color:var(--sub);margin-bottom:6px;letter-spacing:.5px}.legacy-content .credit-bar .cb-desc {font-size:14px;color:var(--text);line-height:1.7}.legacy-content .home-link {display:flex;justify-content:center;margin-top:28px}.legacy-content .home-link a {display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;border:none;padding:14px 36px;border-radius:999px;font-size:15px;font-weight:700;cursor:pointer;box-shadow:0 6px 20px rgba(0,102,255,0.35);transition:transform .15s,box-shadow .15s,filter .15s;text-decoration:none;font-family:inherit}.legacy-content .home-link a:hover {transform:translateY(-2px);filter:brightness(1.08);box-shadow:0 10px 26px rgba(0,102,255,0.42)}.legacy-content .home-link a:active {transform:translateY(0)}

.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)}