.frozen-content-hub{--hub-site-width:var(--level-one-site-width,1180px);--hub-green:var(--level-one-green,#078b3b);--hub-green-dark:var(--level-one-green-dark,#066f31);--hub-ink:var(--level-one-ink,#111827);--hub-muted:var(--level-one-muted,#5f666d);--hub-line:var(--level-one-line,#dfe7e2);--hub-soft:var(--level-one-soft,#f7fbf8);--hub-shadow:var(--level-one-shadow,0 14px 34px #1c3b2b12);--hub-h1-size:var(--level-one-h1-size,clamp(2.45rem,2.75vw,2.72rem));--hub-h1-line-height:var(--level-one-h1-line-height,1.04);--hub-h1-letter-spacing:var(--level-one-h1-letter-spacing,-.05em);--hub-body-size:var(--level-one-body-size,.91rem);--hub-body-line-height:var(--level-one-body-line-height,1.58);--hub-section-title-size:var(--level-one-section-title-size,1.48rem);--hub-card-radius:var(--level-one-card-radius,16px);--hub-hero-radius:var(--level-one-hero-radius,18px);--hub-button-height:var(--level-one-button-height,42px);--hub-button-radius:var(--level-one-button-radius,8px);width:min(var(--hub-site-width),calc(100% - 48px));color:var(--hub-ink);margin:0 auto;padding:34px 0 42px;font-family:inherit;font-size:16px;line-height:1.5}.frozen-content-hub *{box-sizing:border-box}.hub-hero{grid-template-columns:.96fr 1.04fr;align-items:center;gap:20px;padding:0 0 34px;display:grid}.hub-hero-copy{max-width:555px;padding:0}.hub-eyebrow{color:#087a36;letter-spacing:.01em;background:#edf8f0;border-radius:999px;align-items:center;gap:8px;min-height:28px;padding:0 12px;font-size:.72rem;font-weight:800;display:inline-flex}.hub-eyebrow span{font-size:.95rem;font-weight:700;line-height:1}.hub-hero h1{max-width:555px;font-size:var(--hub-h1-size);line-height:var(--hub-h1-line-height);letter-spacing:var(--hub-h1-letter-spacing);margin:14px 0 13px}.hub-hero h1 em{color:var(--hub-green);font-style:normal}.hub-hero-copy>p{color:#56605b;max-width:510px;font-size:var(--hub-body-size);line-height:var(--hub-body-line-height);margin:0}.hub-hero-actions{gap:12px;margin-top:21px;display:flex}.hub-button{min-width:0;min-height:var(--hub-button-height);border-radius:var(--hub-button-radius);color:#111;background:#fff;border:1px solid #cfd9d3;justify-content:center;align-items:center;gap:12px;height:auto;padding:0 20px;font-size:.78rem;font-weight:800;text-decoration:none;transition:transform .16s,box-shadow .16s,background .16s;display:inline-flex;box-shadow:0 5px 14px #14281e0d}.hub-button.is-primary{border-color:var(--hub-green);color:#fff;background:linear-gradient(90deg,#078b3b,#06a348);box-shadow:0 8px 20px #078b3b24}.hub-button:hover{transform:translateY(-1px)}.hub-button span{font-size:1rem}.hub-facts{grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;max-width:510px;margin-top:21px;display:grid}.hub-fact{grid-template-columns:28px 1fr;align-items:center;gap:7px;min-width:0;display:grid}.hub-fact>span:first-child{width:28px!important;height:28px!important;color:var(--hub-green)!important;background:#edf8f0!important;border-radius:50%!important}.hub-fact>span:first-child svg{width:15px;height:15px}.hub-fact>span:last-child{min-width:0}.hub-fact strong,.hub-fact small{display:block}.hub-fact strong{font-size:.66rem;line-height:1.18}.hub-fact small{color:#68716c;margin-top:2px;font-size:.57rem;line-height:1.18}.hub-hero-art{width:100%;aspect-ratio:var(--hub-hero-ratio);border-radius:var(--hub-hero-radius);background-color:#fff;background-image:var(--hub-hero-image);background-size:var(--hub-hero-size);background-position:var(--hub-hero-position);box-shadow:var(--hub-shadow);background-repeat:no-repeat;border:1px solid #e1e8e3}.hub-section{margin-top:26px}.hub-section>h2,.hub-preview-panel>h2,.hub-feature-panel>h2,.hub-bottom-grid>div>h2{color:var(--hub-ink);font-size:var(--hub-section-title-size);letter-spacing:-.025em;margin:0 0 12px;line-height:1.2}.hub-levels>h2,.hub-steps>h2{text-align:center}.hub-level-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px 16px;display:grid}.hub-level-card{border:1px solid color-mix(in srgb,var(--hub-tone) 27%,white);border-radius:var(--hub-card-radius);background:linear-gradient(155deg,#fff 0%,color-mix(in srgb,var(--hub-tone) 4.5%,white) 100%);min-width:0;min-height:150px;color:var(--hub-tone);flex-direction:column;justify-content:space-between;padding:16px 18px 14px;text-decoration:none;transition:transform .16s,box-shadow .16s,border-color .16s;display:flex;box-shadow:0 8px 22px #1c342a0a}.hub-level-card:hover{box-shadow:var(--hub-shadow);transform:translateY(-2px)}.hub-level-top{align-items:flex-start;gap:11px;display:flex}.hub-level-icon>span{background:color-mix(in srgb,var(--hub-tone) 12%,white)!important;width:40px!important;height:40px!important;color:var(--hub-tone)!important;border-radius:50%!important}.hub-level-icon svg{width:21px!important;height:21px!important}.hub-level-card h3{color:var(--hub-tone);margin:1px 0 3px;font-size:.93rem;line-height:1.15}.hub-level-card p{color:#3c433f;margin:0;font-size:.67rem;line-height:1.35}.hub-level-card>strong{color:var(--hub-tone);justify-content:space-between;align-items:center;margin-top:10px;font-size:.7rem;display:flex}.hub-level-card>strong span{font-size:.95rem}.hub-dual{grid-template-columns:1fr 1fr;gap:16px;display:grid}.hub-preview-panel,.hub-feature-panel{border:1px solid var(--hub-line);border-radius:var(--hub-card-radius);background:#fffffff7;min-width:0;padding:14px;box-shadow:0 8px 24px #1d342c0a}.hub-preview-panel>h2,.hub-feature-panel>h2{color:#087b36;letter-spacing:-.01em;margin-bottom:10px;font-size:.9rem}.hub-feature-panel{border-left:1px solid var(--hub-line)}.hub-search-preview{background:#fff;border:1px solid #e3e9e5;border-radius:10px;overflow:hidden}.hub-search-preview input{width:100%;height:40px;color:var(--hub-ink);font:inherit;background:#fbfdfb;border:0;border-bottom:1px solid #e6ece8;border-radius:0;padding:0 12px;font-size:.72rem}.hub-search-results{border:0;border-radius:0;overflow:hidden}.hub-search-row{border-top:1px solid #edf1ef;grid-template-columns:74px 1fr minmax(0,1.45fr);align-items:center;gap:7px;min-height:42px;padding:6px 10px;font-size:.67rem;display:grid}.hub-search-row.has-audio{grid-template-columns:74px 1fr 32px minmax(0,1.45fr)}.hub-search-row.has-handwriting{grid-template-columns:74px 1fr minmax(0,1.45fr) auto}.hub-search-row.has-audio.has-handwriting{grid-template-columns:74px 1fr 32px minmax(0,1.45fr) auto}.hub-search-row:first-child{border-top:0}.hub-search-row a{color:#111;font-family:Noto Serif SC,Songti SC,serif;font-size:1rem;text-decoration:none}.hub-search-pinyin,.hub-search-meaning{color:#4b5563;min-width:0}.hub-search-meaning{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.hub-preview-audio{color:#087b36;cursor:pointer;background:#eff8f1;border:1px solid #cde4d5;border-radius:8px;place-items:center;width:30px;height:30px;padding:0;display:grid}.hub-preview-audio:hover,.hub-preview-audio[aria-pressed=true]{color:#fff;background:#087b36;border-color:#087b36}.hub-preview-audio>span{transform-origin:50%;margin:-7px;transform:scale(.52)}.hub-preview-handwriting{background:#eff8f1;border:1px solid #cde4d5;border-radius:7px;padding:5px 7px;font-weight:800;color:#087b36!important;font-family:inherit!important;font-size:.57rem!important;text-decoration:none!important}.hub-search-empty{color:var(--hub-muted);margin:0;padding:14px;font-size:.7rem}.hub-feature-grid{border:0;grid-template-columns:1fr 1fr;gap:8px;min-height:0;padding:0;display:grid}.hub-feature{background:#fff;border:1px solid #e3e9e5;border-radius:10px;grid-template-columns:31px 1fr;align-content:start;gap:8px;min-height:94px;padding:10px 8px;display:grid}.hub-feature:first-child{border-left:1px solid #e3e9e5}.hub-feature>span:first-child{background:#edf7f0!important;border-radius:8px!important;width:31px!important;height:31px!important}.hub-feature svg{width:17px!important;height:17px!important}.hub-feature>span:last-child{display:block}.hub-feature strong{margin-top:1px;font-size:.68rem;line-height:1.2;display:block}.hub-feature small{color:#5d665f;margin-top:5px;font-size:.57rem;line-height:1.34;display:block}.hub-steps{border-top:0;padding-top:0}.hub-steps>h2{margin-bottom:11px}.hub-step-grid{background:linear-gradient(90deg,#f5fbf6,#fbfefc);border:1px solid #dce7df;border-radius:14px;grid-template-columns:repeat(4,minmax(0,1fr));align-items:center;gap:0;min-height:78px;padding:10px 16px;display:grid;box-shadow:0 7px 20px #1d342c08}.hub-step{background:0 0;border:0;border-radius:0;grid-template-columns:30px 32px 1fr;align-items:center;gap:8px;min-width:0;height:auto;padding:0 22px 0 7px;display:grid;position:relative}.hub-step-num{background:var(--hub-green);color:#fff;border-radius:50%;place-items:center;width:30px;height:30px;font-size:.72rem;font-weight:800;display:grid}.hub-step>span:nth-child(2){background:#edf7f0!important;border-radius:8px!important;width:30px!important;height:30px!important}.hub-step>span:nth-child(2) svg{width:16px!important;height:16px!important}.hub-step>span:nth-child(3){min-width:0;display:block}.hub-step strong{color:#087b36;font-size:.72rem;line-height:1.2;display:block}.hub-step small{color:#59635d;margin-top:2px;font-size:.56rem;line-height:1.25;display:block}.hub-step>i{color:#93aa9a;font-size:1.05rem;font-style:normal;position:absolute;right:3px}.hub-bottom-grid{grid-template-columns:1fr 1fr;gap:16px;display:grid}.hub-bottom-grid>div{border:1px solid var(--hub-line);border-radius:var(--hub-card-radius);background:#fffffff7;min-width:0;padding:14px;box-shadow:0 8px 24px #1d342c0a}.hub-bottom-grid>div>h2{color:#087b36;letter-spacing:-.01em;margin-bottom:10px;font-size:.9rem}.hub-continue-grid{grid-template-columns:1fr 1fr;gap:8px;display:grid}.hub-continue-card{color:#151916;background:#fff;border:1px solid #e3e9e5;border-radius:10px;grid-template-columns:31px 1fr;gap:8px;height:auto;min-height:92px;padding:10px 9px;text-decoration:none;display:grid}.hub-continue-card>span:first-child{width:31px!important;height:31px!important;color:var(--hub-tone)!important;background:color-mix(in srgb,var(--hub-tone) 9%,#fff)!important;border-radius:8px!important}.hub-continue-card>span:last-child{flex-direction:column;align-items:flex-start;gap:3px;min-width:0;display:flex}.hub-continue-card strong{font-size:.67rem;line-height:1.2}.hub-continue-card small{color:#5d665f;min-height:0;font-size:.55rem;line-height:1.3}.hub-continue-card b{color:var(--hub-tone);gap:6px;margin-top:auto;font-size:.57rem;display:flex}.hub-continue-card i{font-style:normal}.hub-faq-list{grid-template-columns:1fr;gap:7px;display:grid}.hub-faq-list details{background:#fff;border:1px solid #e1e7e3;border-radius:9px;overflow:hidden;box-shadow:0 5px 14px #1d342c06}.hub-faq-list summary{cursor:pointer;justify-content:space-between;align-items:center;min-height:38px;padding:0 12px;font-size:.68rem;font-weight:750;list-style:none;display:flex}.hub-faq-list summary::-webkit-details-marker{display:none}.hub-faq-list summary span{color:var(--hub-green);font-size:1rem}.hub-faq-list details[open] summary span{transform:rotate(45deg)}.hub-faq-list details div{color:#626c66;padding:0 12px 12px;font-size:.64rem;line-height:1.48}.hub-faq-list details p{margin:0}.hub-flashcard-preview{background:#fbfdfb;border:1px solid #e3e9e5;border-radius:10px;min-height:188px;padding:12px}.hub-flashcard-meta,.hub-flashcard-actions{color:#4b5563;justify-content:space-between;align-items:center;gap:10px;font-size:.65rem;display:flex}.hub-flashcard-meta span{background:#fff;border:1px solid #dce5df;border-radius:999px;align-items:center;min-height:24px;padding:0 8px;display:inline-flex}.hub-flashcard-card{color:#111;cursor:pointer;background:#fff;border:1px solid #dce5df;border-radius:9px;align-content:center;justify-items:center;gap:4px;width:100%;min-height:112px;margin:9px 0;padding:10px;display:grid}.hub-flashcard-card:hover{border-color:#8fc6a0}.hub-flashcard-pinyin{color:#4b5563;font-size:.72rem}.hub-flashcard-card strong{font-family:Noto Sans SC,sans-serif;font-size:2rem;line-height:1.05}.hub-flashcard-card small{color:#4b5563;min-height:18px;font-size:.68rem}.hub-flashcard-card:not(.is-revealed) small{color:#758078}.hub-flashcard-actions a{color:#087329;white-space:nowrap;font-weight:800;text-decoration:none}.frozen-content-hub a:focus-visible,.frozen-content-hub button:focus-visible,.frozen-content-hub input:focus-visible,.frozen-content-hub summary:focus-visible{outline-offset:2px;outline:3px solid #93c5fd}@media (max-width:1050px){.frozen-content-hub{width:min(100% - 32px,var(--hub-site-width));padding-top:30px}.hub-hero{grid-template-columns:1fr;gap:30px;padding-bottom:36px}.hub-hero-copy{text-align:center;max-width:720px;margin:0 auto}.hub-hero h1,.hub-hero-copy>p{max-width:620px;margin-left:auto;margin-right:auto}.hub-hero-actions{justify-content:center}.hub-facts{text-align:left;max-width:680px;margin:22px auto 0}.hub-hero-art{max-width:760px;margin:0 auto}.hub-level-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hub-dual,.hub-bottom-grid{grid-template-columns:1fr}.hub-step-grid{grid-template-columns:1fr 1fr;gap:8px}.hub-step{border-bottom:1px solid #e4ebe6;min-height:64px}.hub-step:nth-last-child(-n+2){border-bottom:0}.hub-step>i{display:none}}@media (max-width:760px){.frozen-content-hub{width:min(100% - 28px,var(--hub-site-width));padding:28px 0 72px;font-size:15px}.hub-hero{padding-bottom:32px}.hub-hero h1{font-size:clamp(2.2rem,10.5vw,2.65rem)}.hub-hero-copy>p{font-size:.9rem}.hub-hero-actions{display:grid}.hub-button{width:100%}.hub-facts{grid-template-columns:1fr 1fr;gap:14px 10px}.hub-section{margin-top:40px}.hub-section>h2{font-size:1.35rem}.hub-level-grid{grid-template-columns:1fr}.hub-level-card{min-height:158px}.hub-feature-grid,.hub-continue-grid{grid-template-columns:1fr 1fr}.hub-step-grid{grid-template-columns:1fr;padding:8px 14px}.hub-step{border-bottom:1px solid #e4ebe6;min-height:68px;padding:10px 0}.hub-step:last-child{border-bottom:0}.hub-search-row{grid-template-columns:64px 1fr minmax(0,1.05fr);padding:6px 8px;font-size:.62rem}.hub-search-row.has-audio{grid-template-columns:64px 1fr 30px minmax(0,1.05fr)}.hub-search-row.has-handwriting{grid-template-columns:64px 1fr minmax(0,1.05fr) auto}.hub-search-row.has-audio.has-handwriting{grid-template-columns:64px 1fr 30px minmax(0,1.05fr) auto}.hub-flashcard-actions{flex-direction:column;align-items:flex-start}.hub-flashcard-actions a{white-space:normal}}@media (max-width:440px){.hub-facts,.hub-feature-grid,.hub-continue-grid{grid-template-columns:1fr}.hub-search-row{grid-template-columns:58px 1fr minmax(0,1fr)}.hub-search-row.has-audio{grid-template-columns:58px 1fr 30px minmax(0,1fr)}.hub-search-row.has-handwriting{grid-template-columns:58px 1fr minmax(0,1fr) auto}.hub-search-row.has-audio.has-handwriting{grid-template-columns:58px 1fr 30px minmax(0,1fr) auto}.hub-preview-handwriting{font-size:.52rem!important}}