:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--design-frame-w:1664;--design-frame-h:982;--design-root-max:7.5px;--design-root-min:6px;font-size:max(var(--design-root-min),min(var(--design-root-max),.60096vw,1.01833dvh));--surface:#fff;--text-primary:#152033;--text-secondary:#5d6a7c;--primary:#00a921;--primary-hover:#008f1c;--primary-dark:#007a18;--primary-soft:#e5f8e9;--text-button:#72ff84;--info:#2d7ff9;--warning:#f5a400;--error:#e5484d;--error-hover:#c93a3f;--border:#d9dee7;--page-canvas:#ebe3d6;--on-dark:#fffffff0;--on-dark-muted:#ffffffad;--glass-warm:#fff4e01f;--glass-warm-strong:#fff4e029;--glass-highlight:#ffffff14;--glass-highlight-strong:#ffffff1a;--glass-brand:#00a92105;--glass-brand-strong:#00a92108;--glass-line:#ffffff6b;--glass-line-soft:#ffffff6b;--shell-fill:#ffffff1a;--radius-sm:10px;--radius-md:14px;--radius-lg:20px;--radius-pill:999px;--space-page:clamp(24px,6.65vw,40px);--space-block:24px;--shadow-xs:0 1px 2px #0000001f;--shadow-md:0 12px 32px #00000047;--shadow-lg:0 28px 80px #00000052;--glass-inset-lg:inset 0 1px 0 #ffffff29;--glass-inset-sm:inset 0 1px 0 #ffffff2e;--shadow-primary-hover:0 6px 16px #00a9213d;--glass-backdrop-lg:blur(30px) saturate(1.22);--glass-backdrop-sm:blur(68.8px) saturate(1.25);--glass-backdrop-shell:blur(30px) saturate(1.2);--glass-backdrop-teacher-badge:blur(68.8px) saturate(1.2);--glass-large-bg:linear-gradient(145deg,var(--glass-highlight),transparent 52%),var(--glass-brand),var(--glass-warm);--glass-small-bg:linear-gradient(145deg,var(--glass-highlight-strong),transparent 48%),var(--glass-brand-strong),var(--glass-warm-strong);--glass-teacher-badge-bg:linear-gradient(145deg,var(--glass-highlight-strong),transparent 50%),var(--glass-brand-strong),var(--glass-warm-strong);--glass-shell-bg:linear-gradient(145deg,var(--glass-highlight),transparent 50%),var(--shell-fill);--glass-topbar-bg:linear-gradient(145deg,var(--glass-highlight),transparent 55%),var(--glass-brand),var(--glass-warm);--teacher-panel-overlay:linear-gradient(180deg,#0000000a 34%,#00000094),linear-gradient(90deg,#0000002e,transparent 30%,transparent 74%,#00000014);--font:"Inter",system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;--font-courseware:"Inter","LXGW WenKai",system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;--font-pinyin:"pinyin","Inter",system-ui,-apple-system,"Segoe UI",sans-serif;--letter-spacing:0;--type-nav-size:16px;--type-nav-line:1.3;--type-nav-weight:600;--type-subtitle-size:20px;--type-subtitle-line:1.35;--type-subtitle-weight:600;--type-kicker-size:20px;--type-kicker-weight:700;--type-body-size:18px;--type-body-line:1.45;--type-body-weight:500;--transition:.16s ease}html.legacy-page-root-font{font-size:16px}*,:after,:before{box-sizing:border-box}body,html{width:100%;min-height:100%}body{min-height:100vh;font-family:var(--font);letter-spacing:var(--letter-spacing);color:var(--text-primary);background:var(--page-canvas);-webkit-font-smoothing:antialiased;margin:0}button{font:inherit}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--text-button);outline-offset:3px}@font-face{font-family:pinyin;src:url(../fonts/pinyin-font/bider-hanyupinyin1-regular.ttf)format("truetype");font-weight:400;font-style:normal;font-display:swap}.pinyin{font-family:var(--font-pinyin)}html.classroom-viewport-active{font-size:max(var(--design-root-min),min(var(--design-root-max),.60096vw,1.01833dvh));--design-rem-base:10px;--radius-sm:1rem;--radius-md:1.4rem;--radius-lg:2rem;--radius-pill:99.9rem;--radius-control:2.6rem;--space-block:2.4rem;--spacing-8:.8rem;--spacing-12:1.2rem;--color-surface-glass-light:#ffffff1a;--color-status-success-soft:#4caf5033;--classroom-phase-layout-duration:1.1s;--classroom-phase-layout-ease:cubic-bezier(.4,0,.2,1);--classroom-script-caption-max-width:56rem;--classroom-script-caption-scroll-transition:72ms;--type-nav-size:1.6rem;--type-subtitle-size:2rem;--type-kicker-size:2rem;--type-body-size:1.8rem;--shadow-xs:0 .1rem .2rem #0000001f;--shadow-md:0 1.2rem 3.2rem #00000047;--shadow-lg:0 2.8rem 8rem #00000052;--glass-inset-lg:inset 0 .1rem 0 #ffffff29;--glass-inset-sm:inset 0 .1rem 0 #ffffff2e;--shadow-primary-hover:0 .6rem 1.6rem #00a9213d;--glass-backdrop-lg:blur(3rem) saturate(1.22);--glass-backdrop-sm:blur(6.88rem) saturate(1.25);--glass-backdrop-shell:blur(3rem) saturate(1.2);--glass-backdrop-teacher-badge:blur(6.88rem) saturate(1.2);height:100%;overflow:hidden}body:has(.classroom){background:var(--page-canvas);height:100%;min-height:100%;margin:0;overflow:hidden}.app-icon[data-v-28780906]{fill:none;vertical-align:middle;flex-shrink:0;display:inline-block;overflow:hidden}.app-icon-sprite[data-v-2d7eb3e6]{pointer-events:none;width:0;height:0;position:absolute;overflow:hidden}