:root,[data-app=student-k12]{--cq-sky: #4fc3f7;--cq-sky-2: #7dd3f0;--cq-mint: #a8e6cf;--cq-berry: #d12b12;--cq-berry-2: #d83a21;--cq-berry-d: #bb2509;--cq-lemon: #ffd23f;--cq-lemon-2: #ffe27a;--cq-grape: #9d7be8;--cq-blueberry: #5b8def;--cq-candy-snow: #ffffff;--k12-cream: #fff6e9;--k12-red: #d12b12;--k12-red-ink: #b51d08;--k12-yellow: #ffd23f;--k12-yellow-ink: #9a5a00;--k12-amber: #ff9e3d;--k12-mint: #a8e6cf;--k12-blueberry: #315faf;--k12-grape: #6d45b8;--k12-ink: #2b3a67;--k12-ink-50: rgba(43, 58, 103, .8);--k12-ink-30: rgba(43, 58, 103, .72);--k12-ink-soft: rgba(43, 58, 103, .78);--k12-paper-edge: rgba(43, 58, 103, .1);--k12-halo-yellow: rgba(255, 210, 63, .4);--k12-halo-red: rgba(240, 48, 12, .1);--k12-halo-bottom: rgba(168, 230, 207, .28);--k12-cream-2: #fffaf3;--k12-cream-dark: #ffeed8;--k12-cream-deep: #ffe3c2;--k12-paper: #fffaf3;--k12-ink-2: rgba(43, 58, 103, .78);--k12-ink-muted: #49577a;--k12-ink-light: rgba(43, 58, 103, .72);--k12-ink-faint: rgba(43, 58, 103, .72);--k12-muted: rgba(43, 58, 103, .76);--k12-yellow-deep: rgba(201, 138, 0, .85);--k12-child-surface: #fffaf3;--k12-child-accent: var(--k12-yellow);--k12-parent-surface: #f4f7ff;--k12-parent-surface-strong: #e8efff;--k12-parent-border: rgba(91, 141, 239, .32);--k12-parent-ink: #243764;--k12-parent-accent: var(--k12-blueberry);--k12-danger-surface: #fff1ef;--k12-danger-border: #f4a79a;--k12-danger-ink: #9f1c12;--k12-danger-accent: #d92d20;--k12-dark-surface: #14182a;--k12-dark-surface-raised: #222842;--k12-dark-border: rgba(184, 193, 217, .22);--k12-dark-ink: #f8fafc;--k12-dark-ink-muted: #b8c1d9;--k12-realtime-idle: #55617f;--k12-realtime-idle-bg: rgba(107, 120, 156, .12);--k12-realtime-listening: var(--k12-blueberry);--k12-realtime-listening-bg: rgba(91, 141, 239, .14);--k12-realtime-processing: var(--k12-grape);--k12-realtime-processing-bg: rgba(157, 123, 232, .14);--k12-realtime-success: #17643f;--k12-realtime-error: var(--k12-danger-accent);--k12-font-zh: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;--k12-font-body: var(--k12-font-zh);--k12-font-display: var(--k12-font-zh);--k12-font-serif: var(--k12-font-zh);--k12-font-en: var(--k12-font-zh);--cq-r-card: 28px;--cq-r-cta: 30px;--cq-r-icon: 22px;--cq-r-pill: 999px;--cq-sh-card: 0 6px 0 rgba(43, 58, 103, .05), 0 14px 28px -12px rgba(240, 48, 12, .32);--cq-sh-cta: 0 8px 0 var(--cq-berry-d), 0 18px 30px -10px rgba(240, 48, 12, .5);--cq-sh-pop: 0 4px 14px rgba(43, 58, 103, .14);--cq-ease-bouncy: cubic-bezier(.34, 1.56, .64, 1);--color-canvas: var(--k12-cream);--color-primary: var(--k12-red);--color-primary-light: var(--cq-berry-2);--color-primary-hover: #c52610;--color-primary-active: #a52218;--color-primary-dark: #a52218;--color-muted: #55617f;--color-success: #17643f;--color-warning: #7a4a00;--color-danger: #a52218;--color-info: #1f4c9b}[data-app=student-k12] .app-shell{background:var(--k12-cream)}[data-app=student-k12] .k12-shell{background:radial-gradient(ellipse 420px 260px at 16% -4%,var(--k12-halo-yellow) 0%,transparent 58%),radial-gradient(ellipse 380px 280px at 96% 12%,var(--k12-halo-red) 0%,transparent 58%),radial-gradient(ellipse 480px 340px at 50% 104%,var(--k12-halo-bottom) 0%,transparent 60%),var(--k12-cream)}.k12-paper-shell:before,.k12-shell:before{opacity:0!important;background-image:none!important}[data-app=student-k12] .k12-paper-shell{background:radial-gradient(ellipse 420px 260px at 16% -4%,var(--k12-halo-yellow) 0%,transparent 58%),radial-gradient(ellipse 380px 280px at 96% 12%,var(--k12-halo-red) 0%,transparent 58%),radial-gradient(ellipse 480px 340px at 50% 104%,var(--k12-halo-bottom) 0%,transparent 60%),var(--k12-cream)!important}[data-app=student-k12] .k12-wax-seal{min-height:var(--k12-primary-cta-height, 72px)!important;border-radius:var(--cq-r-cta)!important;background:linear-gradient(135deg,var(--cq-berry-2) 0%,var(--cq-berry) 55%,var(--cq-berry-d) 100%)!important;box-shadow:var(--cq-sh-cta)!important;transition:transform .14s var(--cq-ease-bouncy),box-shadow .14s ease!important}[data-app=student-k12] .k12-wax-seal:active:not(:disabled){transform:translateY(4px) scale(.99)!important;box-shadow:0 3px 0 var(--cq-berry-d),0 8px 18px -6px #f0300c80!important}[data-app=student-k12] .k12-wax-seal:hover:not(:disabled){transform:translateY(-1px)!important}[data-app=student-k12] .k12-wax-seal__seal{background:#ffffffeb!important;border:none!important;box-shadow:inset 0 -3px #2b3a6714;border-radius:50%!important}[data-app=student-k12] .k12-wax-seal__title{font-size:17px!important;letter-spacing:0!important}[data-app=student-k12] .k12-hero-editorial-title__kicker{text-transform:none!important;letter-spacing:0!important;color:var(--k12-red-ink)!important;font-weight:800!important;font-size:13px!important}[data-app=student-k12] .k12-hero-editorial-title__main{color:var(--k12-ink)!important;font-weight:900!important}[data-app=student-k12] .k12-hero-editorial-title__main :deep(em),[data-app=student-k12] .k12-hero-editorial-title__main em{color:var(--k12-yellow-ink)!important;border-bottom-color:var(--k12-yellow)!important}[data-app=student-k12] .k12-hero-editorial-title__sub{font-family:var(--k12-font-zh)!important;font-style:normal!important;color:var(--k12-ink-soft)!important}[data-app=student-k12] .k12-editorial-signoff__chapter{text-transform:none!important;letter-spacing:0!important;color:var(--k12-red-ink)!important;font-weight:700!important}[data-app=student-k12] .k12-editorial-signoff__date{font-family:var(--k12-font-zh)!important;font-style:normal!important;color:var(--k12-ink-soft)!important}[data-app=student-k12] .k12-warm-card{border-radius:var(--cq-r-card)!important;border:1px solid var(--k12-paper-edge)!important;box-shadow:var(--cq-sh-card)!important;background:var( --k12-cream-2 )!important}[data-app=student-k12] .k12-warm-card.is-clickable{transition:transform .12s var(--cq-ease-bouncy)}[data-app=student-k12] .k12-warm-card.is-clickable:active{transform:scale(.97)}[data-app=student-k12] .k12-warm-card--parent{border-radius:var(--cq-r-card)!important}[data-app=student-k12] .k12-ip-mascot-stage__halo{background:radial-gradient(circle,var(--k12-halo-yellow) 0%,transparent 68%)!important}[data-app=student-k12] .k12-reward-ring__value{color:var(--k12-ink)!important}[data-app=student-k12] .k12-paper-envelope{border-radius:var(--cq-r-card)!important}[data-app=student-k12] .k12-mascot-fab__button,[data-app=student-k12] .k12-mascot-fab__btn{background:radial-gradient(circle at 35% 28%,var(--cq-berry-2),var(--cq-berry) 60%,var(--cq-berry-d))!important;border:4px solid var(--cq-candy-snow)!important;box-shadow:0 10px 24px -6px #f0300c8c!important}[data-app=student-k12] .k12-top-bar{background:#fff6e9e6!important;border-bottom:1px solid var(--k12-paper-edge)!important}[data-app=student-k12] .k12-top-bar__avatar{background:linear-gradient(135deg,var(--cq-lemon-2),var(--cq-lemon))!important;box-shadow:0 2px 6px #f0300c2e,0 0 0 2px #ffffffd9!important}[data-app=student-k12] .k12-top-bar__name{color:var(--k12-ink)!important}[data-app=student-k12] .k12-top-bar__label{text-transform:none!important;letter-spacing:0!important;color:var(--k12-ink-soft)!important}[data-app=student-k12] .k12-top-bar__btn:active{transform:scale(.92)!important}[data-app=student-k12] .k12-top-bar__badge{background:var(--k12-red)!important}[data-app=student-k12] .k12-bottom-nav{background:#fff6e9f0!important;border-top:1px solid var(--k12-paper-edge)!important;box-shadow:0 -6px 20px -10px #f0300c1f!important}[data-app=student-k12] .k12-bottom-nav__tab svg{width:28px!important;height:28px!important;transition:transform .18s var(--cq-ease-bouncy)}[data-app=student-k12] .k12-bottom-nav__tab span{font-size:13px!important;letter-spacing:0!important}[data-app=student-k12] .k12-bottom-nav__tab.is-active{color:var(--k12-red-ink)!important}[data-app=student-k12] .k12-bottom-nav__tab.is-active svg{transform:translateY(-3px) scale(1.16)}[data-app=student-k12] .k12-bottom-nav__tab.is-active:after{background:var(--k12-red-ink)!important;width:5px!important;height:5px!important}[data-app=student-k12] .k12-bottom-nav__tab:active{transform:scale(.94)!important}[data-app=student-k12] .k12-bottom-nav__mascot-img{width:40px!important;height:40px!important;filter:drop-shadow(0 3px 8px rgba(240,48,12,.4))!important}[data-app=student-k12] .k12-bottom-nav__tab--mascot.is-active .k12-bottom-nav__mascot-img{filter:drop-shadow(0 3px 10px rgba(240,48,12,.6))!important}[data-app=student-k12] .k12-bottom-nav__tab--mascot span{color:var(--k12-red-ink)!important}[data-app=student-k12] [data-functional-icon],[data-app=student-k12] [data-icon-only]>:where(svg,img):not(.mascot-avatar){width:var(--k12-functional-icon-size, 22px);height:var(--k12-functional-icon-size, 22px)}[data-app=student-k12].k12-parent-surface,[data-app=student-k12] .k12-parent-surface{--k12-control-height: 46px;--k12-primary-cta-height: 56px;color:var(--k12-parent-ink);background:var(--k12-parent-surface);border-color:var(--k12-parent-border)}[data-app=student-k12].k12-child-surface,[data-app=student-k12] .k12-child-surface{--k12-control-height: 52px;--k12-primary-cta-height: 64px}[data-app=student-k12].k12-danger-surface,[data-app=student-k12] .k12-danger-surface{color:var(--k12-danger-ink);background:var(--k12-danger-surface);border-color:var(--k12-danger-border)}[data-app=student-k12].k12-dark-surface,[data-app=student-k12] .k12-dark-surface{color:var(--k12-dark-ink);background:var(--k12-dark-surface);border-color:var(--k12-dark-border)}[data-app=student-k12] [data-realtime-state=idle]{--k12-realtime-current: var(--k12-realtime-idle)}[data-app=student-k12] [data-realtime-state=listening]{--k12-realtime-current: var(--k12-realtime-listening)}[data-app=student-k12] [data-realtime-state=processing]{--k12-realtime-current: var(--k12-realtime-processing)}[data-app=student-k12] .cq-tile__ico,[data-app=student-k12] .cq-cell__ico,[data-app=student-k12] .cq-step__icon,[data-app=student-k12] .cq-branch__ico{border-radius:var(--cq-r-icon);box-shadow:var(--cq-sh-pop);place-items:center}[data-app=student-k12] .pb-ico--sky,[data-app=student-k12] .cq-tile__ico--sky{background:linear-gradient(135deg,#bfeaff,var(--cq-sky))}[data-app=student-k12] .pb-ico--mint,[data-app=student-k12] .cq-tile__ico--mint{background:linear-gradient(135deg,#cff5e5,var(--cq-mint))}[data-app=student-k12] .pb-ico--lemon,[data-app=student-k12] .cq-tile__ico--lemon{background:linear-gradient(135deg,#ffe7b0,var(--cq-lemon))}[data-app=student-k12] .pb-ico--grape,[data-app=student-k12] .cq-tile__ico--grape{background:linear-gradient(135deg,#d7c7fa,var(--cq-grape))}[data-app=student-k12] .pb-ico--berry,[data-app=student-k12] .cq-tile__ico--berry{background:linear-gradient(135deg,var(--cq-berry-2),var(--cq-berry))}[data-app=student-k12] [class*=__kicker],[data-app=student-k12] [class*=__chapter],[data-app=student-k12] [class*=__eyebrow],[data-app=student-k12] [class*=__label-en]{text-transform:none!important;letter-spacing:0!important}[data-app=student-k12] .k12-ip-mascot-stage{max-width:92px!important;max-height:92px!important}[data-app=student-k12] .k12-ip-mascot-stage>img,[data-app=student-k12] .k12-ip-mascot-stage__img,[data-app=student-k12] .k12-ip-mascot-stage img{max-width:100%!important;max-height:100%!important}[data-app=student-k12] .didan-brand-area__mascot,[data-app=student-k12] .mascot-avatar-wrapper{max-width:92px!important;max-height:92px!important}[data-app=student-k12] .didan-brand-area__mascot .mascot-avatar,[data-app=student-k12] .mascot-avatar-wrapper .mascot-avatar,[data-app=student-k12] img.mascot-avatar{max-width:92px!important;max-height:92px!important;object-fit:contain}[data-app=student-k12] .k12-editorial-signoff__chapter,[data-app=student-k12] .k12-editorial-signoff__date,[data-app=student-k12] .xlm-fab__label{font-size:13px!important}@media (prefers-reduced-motion: reduce){[data-app=student-k12]{scroll-behavior:auto!important}}@keyframes k12-narrative-arrive{0%{opacity:0;transform:translateY(14px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes k12-narrative-score{0%{opacity:0;transform:translateY(12px) scale(.92)}68%{opacity:1;transform:translateY(-2px) scale(1.02)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes k12-narrative-waiting{0%,to{opacity:.74;transform:scale(.985)}50%{opacity:1;transform:scale(1)}}[data-app=student-k12][data-k12-motion=post-lesson-celebration] .post-hero,[data-app=student-k12][data-k12-motion=post-lesson-celebration] .rewards{transform-origin:center;animation:k12-narrative-score .72s var(--k12-motion-ease) both}[data-app=student-k12][data-k12-motion=post-lesson-celebration] .rewards{animation-delay:.12s}[data-app=student-k12][data-k12-motion=ai-speaking-score-celebration]{position:relative}[data-app=student-k12][data-k12-motion=ai-speaking-score-celebration] :where(.ai-speaking-result__hero,.dialog-score-panel,.ai-speaking-result__narrative){transform-origin:center;animation:k12-narrative-score .68s var(--k12-motion-ease) both}[data-app=student-k12][data-k12-motion=classroom-entry-transition] :where(.enter-stage,.classroom-hero,.stage-grid){transform-origin:center top;animation:k12-narrative-arrive .52s var(--k12-motion-ease) both}[data-app=student-k12][data-k12-motion=xiaolongma-emotion-transition] .k12-mascot-emotion-enter-active,[data-app=student-k12][data-k12-motion=xiaolongma-emotion-transition] .k12-mascot-emotion-leave-active{transition:opacity .22s ease,transform .22s var(--k12-motion-bounce)}[data-app=student-k12][data-k12-motion=xiaolongma-emotion-transition] .k12-mascot-emotion-enter-from{opacity:0;transform:translateY(8px) scale(.9)}[data-app=student-k12][data-k12-motion=xiaolongma-emotion-transition] .k12-mascot-emotion-leave-to{opacity:0;transform:translateY(-5px) scale(.94)}[data-app=student-k12][data-k12-motion=ai-speaking-state-motion] :where(.ai-speaking__dock-state,.ai-speaking__msg--live,.ai-speaking__status){transform-origin:center;animation:k12-narrative-arrive .32s var(--k12-motion-ease) both}[data-k12-motion=library-page-turn-and-finish] .reader__paper{position:relative;transform-origin:center}[data-k12-motion=library-page-turn-and-finish] :where(.reader-page-next-enter-active,.reader-page-next-leave-active,.reader-page-prev-enter-active,.reader-page-prev-leave-active){transition:opacity .26s ease,transform .26s var(--k12-motion-ease)}[data-k12-motion=library-page-turn-and-finish] .reader-page-next-enter-from,[data-k12-motion=library-page-turn-and-finish] .reader-page-prev-leave-to{opacity:0;transform:translate(28px) rotate(1deg)}[data-k12-motion=library-page-turn-and-finish] .reader-page-next-leave-to,[data-k12-motion=library-page-turn-and-finish] .reader-page-prev-enter-from{opacity:0;transform:translate(-28px) rotate(-1deg)}[data-k12-motion=library-page-turn-and-finish][data-reader-finished=true] .reader__finish-note{transform-origin:center;animation:k12-narrative-score .56s var(--k12-motion-ease) both}[data-app=student-k12] [data-k12-motion=purchase-trust-ceremony],[data-app=student-k12] [data-k12-motion=signature-trust-ceremony]{position:relative;transform-origin:center;animation:k12-narrative-score .62s var(--k12-motion-ease) both}[data-app=student-k12] [data-k12-motion=landing-ai-waiting]{transform-origin:center;animation:k12-narrative-waiting 1.6s ease-in-out infinite}[data-app=student-k12] [data-k12-motion=landing-result-reveal]{transform-origin:center top;animation:k12-narrative-arrive .52s var(--k12-motion-ease) both}@media (prefers-reduced-motion: reduce){[data-app=student-k12][data-k12-motion=post-lesson-celebration] :where(.post-hero,.rewards),[data-app=student-k12][data-k12-motion=ai-speaking-score-celebration] :where(.ai-speaking-result__hero,.dialog-score-panel,.ai-speaking-result__narrative),[data-app=student-k12][data-k12-motion=classroom-entry-transition] :where(.enter-stage,.classroom-hero,.stage-grid),[data-app=student-k12][data-k12-motion=xiaolongma-emotion-transition] :where(.k12-mascot-emotion-enter-active,.k12-mascot-emotion-leave-active),[data-app=student-k12][data-k12-motion=ai-speaking-state-motion] :where(.ai-speaking__dock-state,.ai-speaking__msg--live,.ai-speaking__status),[data-k12-motion=library-page-turn-and-finish] :where(.reader-page-next-enter-active,.reader-page-next-leave-active,.reader-page-prev-enter-active,.reader-page-prev-leave-active,.reader__finish-note),[data-app=student-k12] [data-k12-motion=purchase-trust-ceremony],[data-app=student-k12] [data-k12-motion=signature-trust-ceremony],[data-app=student-k12] [data-k12-motion=landing-ai-waiting],[data-app=student-k12] [data-k12-motion=landing-result-reveal]{animation:none!important;transition:none!important}}:root,[data-app=student-k12]{--k12-min-touch-target: 44px;--k12-control-height: 48px;--k12-control-height-comfortable: 52px;--k12-primary-cta-height: 60px;--k12-hero-cta-height: 72px;--k12-control-font-size: 15px;--k12-primary-action-font-size: 16px;--k12-functional-icon-size: 22px;--k12-body-min-size: 15px;--k12-body-size: 16px;--k12-primary-title-size: 26px;--k12-focus-ring: #b51d08}[data-app=student-k12],[data-app=student-k12] *{letter-spacing:0!important}[data-app=student-k12]{font-size:var(--k12-body-size);line-height:1.55}[data-app=student-k12] :where(h1,.k12-hero-editorial-title__main){font-size:max(var(--k12-primary-title-size),1em)!important;line-height:1.35!important;min-height:40px}[data-app=student-k12] :where(button,select,[role=button],[role=tab],[role=switch]){box-sizing:border-box;min-width:var(--k12-min-touch-target);min-height:var(--k12-min-touch-target);touch-action:manipulation}[data-app=student-k12] :where(input:not([type=hidden]):not([type=checkbox]):not([type=radio]),textarea){box-sizing:border-box;min-height:var(--k12-control-height)}[data-app=student-k12] label:has(input[type=checkbox]),[data-app=student-k12] label:has(input[type=radio]){box-sizing:border-box;min-height:var(--k12-min-touch-target)}[data-app=student-k12] :where(.k12-wax-seal,[data-primary-action]){min-height:var(--k12-primary-cta-height);height:auto;min-width:0;font-size:var(--k12-primary-action-font-size);line-height:1.35;white-space:normal;overflow-wrap:anywhere}[data-app=student-k12] 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