@layer theme{:root,[data-design-theme=learner]{--color-ink:#211f26;--color-ink-soft:#4a4750;--color-muted:#7c7986;--color-subtle:#b3b0b8;--color-canvas:#faf7f2;--color-paper:#fff;--color-white:#fff;--color-line:#ede7dd;--color-line-soft:#f4efe7;--color-illus-sheet-edge:#1f2d45;--color-illus-skeleton:#d9d7d0;--color-brand:#2d6ae5;--color-brand-edge:#1c4db0;--color-brand-deep:#1a2238;--color-brand-soft:#e7eefc;--color-gold:#f4a52a;--color-gold-edge:#c7820f;--color-gold-soft:#fcefd6;--color-correct:#2ba85f;--color-correct-edge:#1c7c44;--color-correct-soft:#e3f5e9;--color-coral:#ff6a4d;--color-coral-edge:#d24a30;--color-coral-soft:#ffe6df;--color-berry:#f3618c;--color-berry-soft:#ffe3ec;--color-learner-canvas:#fbf8f3;--color-learner-canvas-deep:#f3ecdf;--color-learner-action:#f5860a;--color-learner-action-edge:#c2670a;--color-learner-action-soft:#ffe7cc;--color-learner-action-deep:#d97400;--color-learner-grass:#34c759;--color-learner-grass-edge:#1f9e44;--color-learner-grass-soft:#e0f7e7;--color-learner-sky:#2ba7e6;--color-learner-sky-edge:#1186c4;--color-learner-sky-soft:#e1f2fc;--color-learner-grape:#9b6cff;--color-learner-grape-edge:#7642d6;--color-learner-grape-soft:#efe7ff;--color-learner-heart:var(--color-berry);--color-learner-heart-soft:var(--color-berry-soft);--color-learner-reward:#f7b223;--color-learner-teal:#00b8a8;--color-learner-muted:#8a8792;--color-learner-subtle:#b9b6bf;--color-learner-line:#ece5da;--color-learner-line-soft:#f5f0e8;--color-learner-ai-bg:#201e26;--color-learner-ai-edge:#0e0d12;--color-learner-ai-accent:#3fe0c2;--color-learner-scene-night:#1c2440;--color-learner-scene-dusk:#2e2a4d;--color-navy:#1a2238;--color-teal:#1fa89a;--color-teal-soft:#e6f6f3;--color-illo-cream:#faf2e2;--color-danger:#c9402a;--color-wechat:#07c160;--color-wechat-ink:#09713f;--color-wechat-line:#80dca9;--color-wechat-soft:#f0fff4;--public-canvas:var(--color-canvas);--public-panel:#fff;--public-panel-soft:#f4efe7;--public-warm-note:var(--color-gold-soft);--public-dot-grid:#211f260d;--public-dot-grid-size:22px;--radius-lg:24px;--radius-md:16px;--radius-sm:12px;--radius-card:18px;--radius-child:24px;--radius-learner-card:20px;--radius-learner-option:22px;--radius-learner-button:20px;--radius-control:14px;--radius-pill:999px;--shadow-card:0 12px 32px #211f2612;--shadow-soft:0 12px 34px #211f260f;--shadow-lift:0 18px 48px #211f261a;--learner-lip-size:6px;--shadow-learner-lip:0 4px 0 var(--color-orange-edge);--shadow-learner-panel:0 18px 42px #5d3e2024, 0 1px 0 #ffffffa3 inset;--shadow-learner-card:0 14px 32px #5d3e2021, 0 1px 0 #ffffffb3 inset;--shadow-learner-soft-card:0 10px 28px #211f2617;--space-page-x:2rem;--space-page-y:3rem;--space-section:2rem;--space-public-section:6rem;--space-card:1.75rem;--space-xxs:.25rem;--space-xs:.5rem;--space-sm:.75rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--space-xxl:3rem;--text-page-title:3.5rem;--text-section-title:1.75rem;--text-card-title:1.125rem;--text-body:1rem;--text-caption:.8125rem;--font-weight-page-title:600;--font-weight-section-title:600;--font-weight-card-title:500;--font-weight-button:600;--font-weight-body-strong:500;--app-text-display:2.375rem;--app-text-hero:1.875rem;--app-text-display-mobile:1.875rem;--app-text-hero-mobile:1.5rem;--app-text-title:1.5rem;--app-text-section:1.125rem;--app-text-card:1.0625rem;--app-text-md:.9375rem;--app-text-body:.875rem;--app-text-sm:.8125rem;--app-text-meta:.75rem;--app-text-2xs:.6875rem;--text-learner-focus:4rem;--text-learner-display:2.375rem;--text-learner-prompt:1.75rem;--text-learner-title:1.375rem;--text-learner-section:1.1875rem;--text-learner-body:1rem;--text-learner-app-body:1rem;--text-learner-app-md:.9375rem;--text-learner-label:.9375rem;--text-learner-meta:.8125rem;--font-weight-regular:400;--font-weight-medium:500;--font-weight-semibold:600;--font-weight-bold:700;--font-weight-learner-body:600;--font-weight-learner-title:800;--font-weight-learner-focus:var(--font-weight-bold);--line-height-body:1.6;--motion-press:.12s;--motion-state:.18s;--motion-panel:.24s;--motion-reward:.36s;--motion-easing:cubic-bezier(.2, 0, 0, 1);--layout-public-container:min(1240px, calc(100% - (var(--space-page-x) * 2)));--layout-product-container:min(1280px, calc(100% - (var(--space-page-x) * 2)));--font-en:-apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;--font-cn:"PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "WenQuanYi Micro Hei", sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, monospace;--radius-learner-control:16px;--radius-learner-hero:22px;--line-height-page-title:1.08;--line-height-section-title:1.2;--line-height-card-title:1.3;--font-weight-body:400;--font-weight-caption:500;--line-height-caption:1.4;--text-button:1rem;--line-height-button:1;--font-weight-learner-display:900;--line-height-learner-display:1.1;--font-weight-learner-prompt:800;--line-height-learner-prompt:1.3;--line-height-learner-title:1.3;--line-height-learner-body:1.7;--text-learner-reading:1.1875rem;--font-weight-learner-reading:400;--line-height-learner-reading:1.7;--text-learner-eyebrow:.8125rem;--font-weight-learner-eyebrow:800;--line-height-learner-eyebrow:1.2;--color-background:#fbfbfb;--color-foreground:var(--color-ink);--color-card:var(--color-paper);--color-card-foreground:var(--color-ink);--color-popover:var(--color-paper);--color-popover-foreground:var(--color-ink);--color-primary:var(--color-brand);--color-primary-foreground:var(--color-white);--color-secondary:var(--color-line-soft);--color-secondary-foreground:var(--color-ink-soft);--color-muted-foreground:var(--color-muted);--color-accent:var(--color-brand-soft);--color-accent-foreground:var(--color-brand-edge);--color-destructive:var(--color-danger);--color-destructive-foreground:var(--color-white);--color-border:var(--color-line);--color-input:var(--color-line);--color-ring:var(--color-brand);--color-brand-focus:#2563eb24;--color-public-focus:#0369a138;--color-public-faq-focus:#2d6ae54d;--color-public-chat-bubble:#ffffff1a;--color-public-chat-text:#ffffffdb;--color-public-pain-copy:#ffffffc2;--color-public-muted:#67646c;--color-public-learning-stage:#203c53;--color-status-focus:#0369a142;--color-modal-scrim:#f7f6eeb8;--color-orange:#ff8534;--color-orange-edge:#e26a1a;--color-orange-ink:#b4530a;--color-orange-soft:#fff1e3;--color-orange-soft-deep:#ffe6cc;--color-periwinkle:#5b7cfa;--color-periwinkle-edge:#3f5ce0;--color-periwinkle-soft:#eef1ff;--color-periwinkle-line:#bac8ff;--color-learner-green:#2fb95d;--color-learner-green-edge:#269a4c;--color-learner-green-soft:#dcf5e5;--color-learner-green-ink:#1e8a43;--color-learner-green-line:#a5e076;--color-learner-green-ring:#b8e69a;--color-coral-line:#ffc0c1;--color-coral-ink:#bd3a22;--color-rose:#f2537d;--color-rose-soft:#ffe4ec;--color-honey:#ffb703;--color-honey-edge:#d99a00;--color-honey-soft:#fff1cc;--color-learner-teal-edge:#009b8d;--color-learner-teal-light:#9edcd4;--color-learner-teal-soft:#f2fbf9;--color-learner-teal-ink:#0a6b5e;--color-learner-ink:#4b4b4b;--color-learner-ink-2:#6f6f6f;--color-learner-ink-3:#afafaf;--color-learner-paper-warm:#fffdf8;--color-learner-paper-warm-edge:#f0e3cf;--color-learner-material-ink:#3a2f26;--color-gallery-void:#070b1e;--color-gallery-void-2:#121a3d;--color-gallery-hud:#c3d0ff;--color-gallery-hud-dim:#8393c9;--color-gallery-hud-line:#3a4a8f;--color-learner-card-line:#e5e5e5;--color-learner-disabled:#e7e7e7;--color-learner-disabled-ink:#adadad;--color-learner-disabled-edge:#d4d4d4;--color-learner-eliminated:#fafafa;--color-learner-slot:#f6f7ff;--color-learner-slot-line:#c9cff2;--color-learner-grip:#cfcfcf;--font-serif-material:Georgia, "Songti SC", "STSong", serif;--font-math:Georgia, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;--color-danger-soft:var(--color-coral-soft);--radius-app-lg:24px;--radius-app-md:16px;--radius-app-sm:12px;--radius-app-card:18px;--radius-app-child:24px;--radius-app-control:14px;--radius-app-learner-card:28px;--radius-app-learner-option:22px;--radius-app-learner-button:20px;--radius-app-pill:999px;--text-app-display:var(--app-text-display);--text-app-hero:var(--app-text-hero);--text-app-title:var(--app-text-title);--text-app-section:var(--app-text-section);--text-app-card:var(--app-text-card);--text-app-md:var(--app-text-md);--text-app-body:var(--app-text-body);--text-app-sm:var(--app-text-sm);--text-app-meta:var(--app-text-meta);--text-app-2xs:var(--app-text-2xs);--shadow-app-card:0 12px 32px #211f2612;--shadow-app-lift:0 18px 48px #211f261a;--shadow-learner-action:0 4px 0 var(--color-orange-edge);--shadow-learner-card-lip:0 3px 0 var(--color-learner-card-line);--shadow-learner-step:0 2px 0 var(--color-learner-teal-edge);--shadow-ring-brand:0 0 0 5px #2d6ae51f;--shadow-ring-teal:0 0 0 5px #1fa89a1f;--shadow-ring-gold:0 0 0 5px #f4a52a1f;--shadow-ring-coral:0 0 0 5px #ff6a4d1f;--shadow-brand-tile:0 18px 32px #2d6ae53d;--shadow-login-submit-hover:0 18px 38px #2563eb33;--shadow-public-nav-cta-hover:0 14px 30px #2563eb33;--shadow-public-visual:0 22px 54px #1720331a;--shadow-public-final-cta-hover:0 18px 38px #ffffff2e;--shadow-segment-option:0 1px 3px #00000014;--shadow-ink-sheet:0 16px 28px #211f261a;--duration-app-state:var(--motion-state);--duration-app-press:var(--motion-press);--duration-app-panel:var(--motion-panel);--duration-app-reward:var(--motion-reward);--ease-app:var(--motion-easing);--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "WenQuanYi Micro Hei", system-ui, sans-serif;color:var(--color-ink);background:var(--color-canvas);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Noto Sans CJK SC,Source Han Sans SC,WenQuanYi Micro Hei,ui-sans-serif,system-ui,sans-serif}@media (width<=768px){:root,[data-design-theme=learner]{--app-text-display:var(--app-text-display-mobile);--app-text-hero:var(--app-text-hero-mobile)}}[data-design-theme=ops]{--color-ops-canvas:#f6f5f4;--color-ops-primary:#0075de;--color-ops-primary-edge:#005bab;--color-ops-primary-soft:#eaf3ff;--color-ops-secondary:#213183;--color-ops-line:#e6e6e6;--color-ops-line-soft:#f6f5f4;--color-ops-input-line:#ddd;--color-ops-ink-soft:#31302e;--color-ops-muted:#615d59;--color-ops-subtle:#a39e98;--color-ops-correct:#1aae39;--color-ops-correct-soft:#e9f8ed;--color-ops-correct-edge:#157d2d;--color-ops-gold:#dd5b00;--color-ops-gold-soft:#fff0e5;--color-ops-gold-edge:#793400;--radius-ops-xs:4px;--radius-ops-sm:5px;--radius-ops-md:8px;--radius-ops-lg:12px;--radius-ops-xl:16px;--shadow-ops-card:0 .175px 1.041px #00000003, 0 .8px 2.925px #00000005, 0 2.025px 7.847px #00000007, 0 4px 18px #0000000a;--shadow-ops-card-lg:0 2px 4px #00000005, 0 7px 14px #00000006, 0 23px 52px #0000000d;--color-background:var(--color-ops-canvas);--color-foreground:var(--color-ink);--color-card:var(--color-paper);--color-card-foreground:var(--color-ink);--color-popover:var(--color-paper);--color-popover-foreground:var(--color-ink);--color-primary:var(--color-ops-primary);--color-primary-active:var(--color-ops-primary-edge);--color-primary-foreground:var(--color-white);--color-secondary:var(--color-ops-secondary);--color-secondary-foreground:var(--color-white);--color-muted:var(--color-ops-line-soft);--color-muted-foreground:var(--color-ops-muted);--color-accent:var(--color-ops-primary-soft);--color-accent-foreground:var(--color-ops-primary-edge);--color-destructive:var(--color-danger);--color-destructive-foreground:var(--color-white);--color-border:var(--color-ops-line);--color-input:var(--color-ops-input-line);--color-ring:var(--color-ops-primary);--color-brand:var(--color-ops-primary);--color-brand-soft:var(--color-ops-primary-soft);--color-brand-edge:var(--color-ops-primary-edge);--color-correct:var(--color-ops-correct);--color-correct-soft:var(--color-ops-correct-soft);--color-correct-edge:var(--color-ops-correct-edge);--color-gold:var(--color-ops-gold);--color-gold-soft:var(--color-ops-gold-soft);--color-gold-edge:var(--color-ops-gold-edge);--color-ink-soft:var(--color-ops-ink-soft);--color-subtle:var(--color-ops-subtle);--color-line:var(--color-ops-line);--color-line-soft:var(--color-ops-line-soft);--radius-xs:var(--radius-ops-xs);--radius-sm:var(--radius-ops-sm);--radius-md:var(--radius-ops-md);--radius-lg:var(--radius-ops-lg);--radius-xl:var(--radius-ops-xl);--shadow-card:var(--shadow-ops-card);--shadow-card-lg:var(--shadow-ops-card-lg)}}@layer base{*{box-sizing:border-box}body{min-width:320px;margin:0}h1{color:var(--color-ink);margin:0;font-size:32px;line-height:1.2}}.shell{background:var(--color-canvas);place-items:center;min-height:100vh;padding:32px;display:grid}.route-panel{border:1px solid var(--color-line);background:var(--color-paper);border-radius:8px;width:min(720px,100%);padding:32px;box-shadow:0 18px 60px #17203317}.route-summary{max-width:520px;color:var(--color-muted);margin:16px 0 0;line-height:1.6}.eyebrow{color:var(--color-brand);letter-spacing:0;text-transform:uppercase;margin:0 0 8px;font-size:13px;font-weight:600}.public-page{--public-header-height:77px;--color-muted:var(--color-public-muted);min-width:320px;color:var(--color-ink);background:var(--color-canvas);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;overflow-x:clip}.public-page *,.public-page :before,.public-page :after{box-sizing:border-box}.public-page a{color:inherit;text-decoration:none}.public-page button,.public-page a{font:inherit}.public-page :focus-visible{outline:3px solid color-mix(in srgb, var(--color-brand) 42%, transparent);outline-offset:4px}.public-product-unavailable{appearance:none;color:inherit;text-align:inherit;cursor:default;background:0 0;border:0;padding:0}.public-shell{width:var(--layout-product-container);margin-inline:auto}.public-header{z-index:50;border-bottom:1px solid color-mix(in srgb, var(--color-line) 88%, transparent);background:color-mix(in srgb, var(--color-canvas) 96%, transparent);position:sticky;top:0}.public-header__inner{grid-template-columns:auto 1fr auto;align-items:center;gap:30px;min-height:76px;display:grid}.public-brand{letter-spacing:0;justify-self:start;align-items:center;gap:10px;font-size:1.0625rem;font-weight:600;display:inline-flex}.public-brand__mark{object-fit:contain;width:36px;height:36px}.public-brand__mark--compact{width:32px;height:32px}.public-nav{color:var(--color-ink-soft);justify-self:center;gap:30px;font-size:.875rem;display:flex}@media (width>=701px) and (width<=850px){.public-nav{white-space:nowrap;gap:16px}}.public-nav a,.public-header__login,.public-footer a{transition:color var(--motion-state) var(--motion-easing)}.public-nav a:hover,.public-header__login:not([aria-disabled=true]):hover,.public-footer a:hover{color:var(--color-brand)}.public-nav__login,.public-menu-button{display:none}.public-header__actions{justify-self:end;align-items:center;gap:18px;display:flex}.public-header__login{color:var(--color-ink-soft);font-size:.875rem;font-weight:600}.public-header__trial{border-radius:var(--radius-control);background:var(--color-brand);min-height:42px;transition:transform var(--motion-state) var(--motion-easing), box-shadow var(--motion-state) var(--motion-easing);justify-content:center;align-items:center;padding-inline:18px;font-size:.8125rem;font-weight:600;display:inline-flex;color:var(--color-white)!important}.public-header__trial:not([aria-disabled=true]):hover{box-shadow:var(--shadow-public-nav-cta-hover);transform:translateY(-1px)}.public-button{border:1px solid var(--color-brand);border-radius:var(--radius-control);white-space:nowrap;min-width:126px;min-height:50px;transition:transform var(--motion-state) var(--motion-easing), box-shadow var(--motion-state) var(--motion-easing), background var(--motion-state) var(--motion-easing);background:0 0;justify-content:center;align-items:center;padding-inline:22px;font-size:.9375rem;font-weight:600;display:inline-flex;color:var(--color-brand)!important}.public-button:not([aria-disabled=true]):hover{transform:translateY(-2px)}.public-button--primary{background:var(--color-brand);color:var(--color-white)!important}.public-button--primary:hover{box-shadow:var(--shadow-login-submit-hover)}.public-button--on-brand{border-color:var(--color-white);background:var(--color-white);color:var(--color-brand-edge)!important}.public-button--on-brand:hover{box-shadow:var(--shadow-login-submit-hover)}.public-button--inverse{border-color:color-mix(in srgb, var(--color-white) 72%, transparent);color:var(--color-white)!important}.public-button--inverse:hover{background:color-mix(in srgb, var(--color-white) 8%, transparent)}.public-hero{background:var(--color-canvas)}.public-hero__inner{max-width:1180px;height:calc(100svh - var(--public-header-height));grid-template-rows:auto minmax(0,1fr) auto auto;min-height:620px;padding-block:32px;display:grid}.public-hero__intro{text-align:center;margin-bottom:24px}.public-hero__title{letter-spacing:0;text-wrap:balance;margin:0;font-size:clamp(2.5rem,4.4vw,4rem);font-weight:600;line-height:1.25}.public-hero__title-character{animation:1ms step-end both public-title-type}.public-hero__title-character:nth-child(2){animation-delay:65ms}.public-hero__title-character:nth-child(3){animation-delay:.13s}.public-hero__title-character:nth-child(4){animation-delay:.195s}.public-hero__title-character:nth-child(5){animation-delay:.26s}.public-hero__title-character:nth-child(6){animation-delay:.425s}.public-hero__title-character:nth-child(7){animation-delay:.49s}.public-hero__title-character:nth-child(8){animation-delay:.555s}.public-hero__title-character:nth-child(9){animation-delay:.62s}.public-hero__title-character:nth-child(10){animation-delay:.685s}.public-hero__title-character:nth-child(11){animation-delay:.75s}@keyframes public-title-type{0%{opacity:0}to{opacity:1}}@media (prefers-reduced-motion:reduce){.public-hero__title-character{animation:none}}.public-hero__intro>p{color:var(--color-ink-soft);margin:12px 0 0;font-size:1.0625rem;line-height:1.7}.public-hero__actions,.public-final-section__actions{flex-wrap:wrap;gap:12px;display:flex}.public-hero__actions{justify-content:center;margin-top:24px}.public-hero__actions .public-button{min-width:176px}.public-hero__proof{color:var(--color-ink-soft);justify-content:center;gap:18px;margin-top:14px;font-size:.75rem;display:flex}.public-hero-stage{border:1px solid var(--color-line);background:var(--color-paper);border-radius:18px;grid-template-rows:minmax(0,1fr) auto;min-height:0;display:grid;position:relative;overflow:visible}.public-hero-stage__viewport{border-radius:17px 17px 0 0;min-height:0;position:relative;overflow:hidden}.public-hero-stage__slide{height:100%;padding:0;animation:.28s ease-out 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