:root{--knowledge-bg:#eef6ff;--knowledge-ink:#17324d;--knowledge-muted:#66798b;--knowledge-line:#d9e7f2;--knowledge-card:#fff;--knowledge-main:#2563eb;--knowledge-main-dark:#1747b0;--knowledge-soft:#e8f1ff;--knowledge-good:#178153;--knowledge-warn:#c56a18;--knowledge-radius:24px;--knowledge-shadow:0 16px 42px rgba(31,68,103,.12);font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif}*{box-sizing:border-box}html,body{margin:0;min-height:100%;color:var(--knowledge-ink);background:var(--knowledge-bg)}body{padding:0 0 max(88px,env(safe-area-inset-bottom));-webkit-tap-highlight-color:transparent}button,a{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}.knowledge-app{width:min(1180px,calc(100% - 28px));margin:0 auto;padding:14px 0 28px}.knowledge-top{height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px}.knowledge-brand{display:flex;align-items:center;gap:12px;min-width:0}.knowledge-brand-icon{width:48px;height:48px;border-radius:16px;background:var(--knowledge-main);display:grid;place-items:center;font-size:26px;color:#fff;box-shadow:0 8px 20px color-mix(in srgb,var(--knowledge-main) 28%,transparent)}.knowledge-brand strong{display:block;font-size:21px;line-height:1.1}.knowledge-brand small{display:block;color:var(--knowledge-muted);font-weight:700;margin-top:4px}.knowledge-top-actions{display:flex;align-items:center;gap:8px}.knowledge-pill{border:1px solid var(--knowledge-line);background:#fff;padding:10px 14px;border-radius:999px;font-weight:800;white-space:nowrap}.knowledge-pill.primary{background:var(--knowledge-main);border-color:var(--knowledge-main);color:#fff}.knowledge-hero{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(300px,.65fr);gap:16px;margin:8px 0 18px}.knowledge-hero-main,.knowledge-hero-side,.knowledge-section{background:var(--knowledge-card);border:1px solid var(--knowledge-line);border-radius:var(--knowledge-radius);box-shadow:var(--knowledge-shadow)}.knowledge-hero-main{padding:28px;position:relative;overflow:hidden;min-height:270px}.knowledge-hero-main:after{content:"";position:absolute;width:220px;height:220px;border-radius:50%;right:-72px;top:-72px;background:var(--knowledge-soft)}.knowledge-eyebrow{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border-radius:999px;background:var(--knowledge-soft);color:var(--knowledge-main-dark);font-weight:900;font-size:13px}.knowledge-hero h1{font-size:clamp(29px,3.5vw,44px);line-height:1.12;margin:15px 0 10px;max-width:660px;position:relative;z-index:1}.knowledge-hero p{font-size:17px;line-height:1.65;color:var(--knowledge-muted);font-weight:650;max-width:680px;margin:0;position:relative;z-index:1}.knowledge-main-action{display:flex;align-items:center;gap:13px;width:min(520px,100%);margin-top:22px;background:var(--knowledge-main);color:#fff;border-radius:18px;padding:14px 16px;position:relative;z-index:1;box-shadow:0 12px 24px color-mix(in srgb,var(--knowledge-main) 28%,transparent)}.knowledge-main-action>i{font-style:normal;font-size:28px}.knowledge-main-action span{min-width:0;flex:1}.knowledge-main-action b,.knowledge-main-action small{display:block}.knowledge-main-action b{font-size:18px}.knowledge-main-action small{opacity:.85;margin-top:3px}.knowledge-main-action em{font-style:normal;background:#fff;color:var(--knowledge-main-dark);padding:8px 12px;border-radius:12px;font-weight:900}.knowledge-hero-side{padding:20px;display:flex;flex-direction:column;justify-content:center}.knowledge-hero-side>strong{font-size:17px;margin-bottom:12px}.knowledge-step-list{display:grid;gap:10px}.knowledge-step{display:flex;align-items:center;gap:11px;padding:11px;border-radius:15px;background:var(--knowledge-soft)}.knowledge-step i{font-style:normal;width:34px;height:34px;border-radius:12px;background:#fff;display:grid;place-items:center;font-weight:900;color:var(--knowledge-main)}.knowledge-step b{display:block}.knowledge-step small{display:block;color:var(--knowledge-muted);margin-top:2px}.knowledge-journey{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.knowledge-journey span{padding:10px 12px;border-radius:14px;background:#fff;border:1px solid var(--knowledge-line);font-weight:900}.knowledge-journey i{font-style:normal;color:var(--knowledge-main);font-weight:900}.knowledge-timeline{display:grid;gap:9px}.knowledge-timeline div{display:grid;grid-template-columns:38px 1fr;gap:10px;align-items:center}.knowledge-timeline i{font-style:normal;width:38px;height:38px;border-radius:50%;background:var(--knowledge-soft);display:grid;place-items:center}.knowledge-timeline b{display:block}.knowledge-timeline small{color:var(--knowledge-muted)}.knowledge-section{padding:22px;margin-top:16px}.knowledge-section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:15px}.knowledge-section h2{margin:0;font-size:24px}.knowledge-section-head p{margin:5px 0 0;color:var(--knowledge-muted);font-weight:650}.knowledge-route-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.knowledge-route{min-height:132px;padding:17px;border:1px solid var(--knowledge-line);border-radius:19px;background:linear-gradient(145deg,#fff,var(--knowledge-soft));display:flex;flex-direction:column;position:relative;transition:.16s transform,.16s box-shadow}.knowledge-route:active{transform:scale(.985)}.knowledge-route i{font-style:normal;font-size:28px}.knowledge-route b{font-size:18px;margin-top:11px}.knowledge-route small{color:var(--knowledge-muted);font-weight:700;line-height:1.4;margin-top:4px}.knowledge-route em{font-style:normal;color:var(--knowledge-main);font-weight:900;margin-top:auto;padding-top:10px}.knowledge-route.is-featured{border:2px solid var(--knowledge-main);box-shadow:0 10px 25px color-mix(in srgb,var(--knowledge-main) 15%,transparent)}.knowledge-choice{border:2px solid var(--knowledge-line);background:#fff;border-radius:16px;padding:13px 15px;text-align:left;font-weight:850;color:var(--knowledge-ink);min-height:50px;transition:.15s}.knowledge-choice:hover{border-color:var(--knowledge-main)}.knowledge-choice.wrong{border-color:#d85a55;background:#fff1f0;color:#9c2e2a}.knowledge-choice.correct{border-color:var(--knowledge-good);background:#edf9f3;color:#0b6a42}.knowledge-feedback{min-height:54px;padding:11px 14px;border-radius:15px;background:var(--knowledge-soft);font-weight:750;line-height:1.45}.knowledge-feedback.good{background:#e8f8f0;color:#126846}.knowledge-feedback.try{background:#fff3df;color:#8b4d0d}.knowledge-explain{display:block;margin-top:4px;font-weight:650}.knowledge-completion-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}.knowledge-completion-actions button,.knowledge-completion-actions a{border:1px solid var(--knowledge-line);border-radius:15px;padding:13px;background:#fff;font-weight:900}.knowledge-completion-actions .primary{grid-column:1/-1;background:var(--knowledge-main);border-color:var(--knowledge-main);color:#fff}@media(max-width:850px){body{padding-bottom:max(84px,env(safe-area-inset-bottom))}.knowledge-app{width:min(100% - 20px,720px)}.knowledge-hero{grid-template-columns:1fr}.knowledge-hero-side{min-height:0}.knowledge-route-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:560px){.knowledge-top{height:auto;padding:10px 0}.knowledge-top-actions .knowledge-pill:not(.primary){display:none}.knowledge-hero-main{padding:22px}.knowledge-route-grid{grid-template-columns:1fr}.knowledge-section{padding:17px}.knowledge-completion-actions{grid-template-columns:1fr}.knowledge-completion-actions .primary{grid-column:auto}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}