:root{--ec-bg:#f5f7fb;--ec-card:#fff;--ec-text:#20283a;--ec-muted:#657089;--ec-primary:#6f7fe8;--ec-primary2:#9b78e8;--ec-border:#e7eaf2;--ec-success:#2d9b72;--ec-warning:#e3a02d;--ec-shadow:0 14px 38px rgba(40,51,89,.10);--ec-radius:22px}
.ec-resource,.ec-resource *{box-sizing:border-box}.ec-resource{max-width:1120px;margin:32px auto 64px;padding:0 18px;color:var(--ec-text);font-family:inherit;line-height:1.72}.ec-resource a{color:#5969d9;text-decoration:none}.ec-resource a:hover{text-decoration:underline}.ec-resource-hero{padding:46px 38px;border-radius:28px;background:linear-gradient(135deg,#eef2ff 0%,#f5efff 100%);border:1px solid #e5e6fb;box-shadow:var(--ec-shadow);margin-bottom:28px}.ec-resource-kicker{display:inline-flex;padding:7px 12px;border-radius:999px;background:#fff;color:#5969d9;font-weight:700;font-size:.88rem;box-shadow:0 6px 16px rgba(62,76,150,.08)}.ec-resource h1{margin:14px 0 10px;font-size:clamp(2rem,4.7vw,3.35rem);line-height:1.08;letter-spacing:-.035em}.ec-resource-lead{max-width:820px;font-size:1.12rem;color:var(--ec-muted);margin:0}.ec-resource-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start}.ec-resource-main,.ec-resource-aside>div{background:var(--ec-card);border:1px solid var(--ec-border);border-radius:var(--ec-radius);box-shadow:0 10px 30px rgba(32,40,58,.06)}.ec-resource-main{padding:34px 38px}.ec-resource-aside{display:grid;gap:18px;position:sticky;top:18px}.ec-resource-aside>div{padding:22px}.ec-resource h2{margin:34px 0 12px;font-size:1.65rem;line-height:1.25}.ec-resource h2:first-child{margin-top:0}.ec-resource h3{margin:24px 0 8px;font-size:1.18rem}.ec-resource p{margin:0 0 16px}.ec-resource ul,.ec-resource ol{padding-left:22px;margin:0 0 18px}.ec-resource li{margin:7px 0}.ec-callout,.ec-tip,.ec-warning,.ec-example,.ec-mini-exercise{padding:18px 20px;border-radius:16px;margin:22px 0}.ec-callout{background:#f6f7ff;border-left:4px solid var(--ec-primary)}.ec-tip{background:#f0faf6;border-left:4px solid var(--ec-success)}.ec-warning{background:#fff8eb;border-left:4px solid var(--ec-warning)}.ec-example,.ec-mini-exercise{background:#fbfbff;border:1px dashed #b9c0e8}.ec-steps{counter-reset:steps;display:grid;gap:12px;margin:20px 0}.ec-step{counter-increment:steps;display:grid;grid-template-columns:42px 1fr;gap:12px;padding:14px 16px;border-radius:15px;background:#f8f9fc;border:1px solid var(--ec-border)}.ec-step:before{content:counter(steps);width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:linear-gradient(135deg,var(--ec-primary),var(--ec-primary2));color:#fff;font-weight:800}.ec-answer{margin-top:12px;padding:14px 16px;background:#fff;border-radius:12px;border:1px solid var(--ec-border)}.ec-cta{margin-top:28px;padding:25px;border-radius:22px;background:linear-gradient(135deg,#6577e8,#9d78e8);color:#fff}.ec-cta h2{color:#fff;margin-top:0}.ec-cta p{color:#f6f3ff}.ec-btns{display:flex;flex-wrap:wrap;gap:10px}.ec-btn{display:inline-flex;padding:11px 16px;border-radius:12px;background:#fff;color:#4d5cc6!important;font-weight:800;text-decoration:none!important}.ec-btn.ec-btn-ghost{background:rgba(255,255,255,.14);color:#fff!important;border:1px solid rgba(255,255,255,.4)}.ec-toc-title{font-weight:800;margin-bottom:10px}.ec-toc a,.ec-related a{display:block;padding:6px 0}.ec-related a{border-bottom:1px solid var(--ec-border)}.ec-meta{color:var(--ec-muted);font-size:.9rem}.ec-formula{text-align:center;font-weight:800;font-size:1.25rem;padding:15px;border-radius:14px;background:#f4f6ff;margin:18px 0}.ec-checklist{display:grid;gap:10px;margin:18px 0}.ec-check{padding:12px 14px;border:1px solid var(--ec-border);border-radius:12px;background:#fff}@media(max-width:900px){.ec-resource-grid{grid-template-columns:1fr}.ec-resource-aside{position:static}}@media(max-width:620px){.ec-resource{padding:0 12px;margin-top:18px}.ec-resource-hero{padding:30px 22px}.ec-resource-main{padding:26px 22px}.ec-resource h1{font-size:2.1rem}}