.sprint-root{--v10-bg:#f5f7fa;--v10-surface:#ffffff;--v10-ink:#10233f;--v10-muted:#66758b;--v10-line:#dbe3ee;--v10-primary:#155eef;--v10-primary-soft:#eef4ff;--v10-success:#087443;--v10-success-soft:#ecfdf3;--v10-warning:#b54708;--v10-warning-soft:#fff7ed;--v10-danger:#b42318;--v10-danger-soft:#fff1f0;--v10-radius:10px;--v10-shadow:0 1px 2px rgba(16,35,63,.05),0 10px 28px rgba(16,35,63,.05);background:var(--v10-bg);color:var(--v10-ink);font-family:PingFang SC,Microsoft YaHei,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.sprint-root,.sprint-root *{letter-spacing:0}.sprint-main{width:min(100%,1180px);padding:22px clamp(16px,3vw,36px) calc(96px + env(safe-area-inset-bottom, 0px))}.sprint-root.is-immersive .sprint-main{padding:0}.sprint-topbar{position:sticky;top:0;z-index:50;display:grid;grid-template-columns:minmax(205px,auto) 1fr auto;grid-template-rows:auto auto;align-items:center;column-gap:18px;row-gap:8px;min-height:78px;padding:calc(9px + env(safe-area-inset-top, 0px)) max(16px,calc((100vw - 1180px) / 2)) 10px;border-bottom:1px solid var(--v10-line);background:rgba(255,255,255,.96);box-shadow:0 1px 8px rgba(16,35,63,.04);backdrop-filter:blur(16px)}.sprint-mode-switch{grid-column:1;grid-row:1;min-width:220px;height:38px;border-color:#d8e1ec;border-radius:9px;background:#f2f5f9}.sprint-mode-switch>i{background:var(--v10-surface);border-radius:7px;box-shadow:0 1px 3px rgba(16,35,63,.14)}.sprint-mode-switch a{min-width:0;color:var(--v10-muted);font-size:13px;font-weight:700}.sprint-mode-switch a.is-active{color:var(--v10-primary)}.sprint-mode-switch a span{color:var(--v10-muted);font-size:10px}.sprint-top-actions{position:static;grid-column:3;grid-row:1;display:flex;align-items:center;justify-content:flex-end;gap:6px}.sprint-icon-link{width:42px;height:42px;border-radius:9px;color:#46617f;transition:background .18s ease,color .18s ease,transform .18s ease}.sprint-icon-link:hover{background:var(--v10-primary-soft);color:var(--v10-primary)}.sprint-icon-link:active{transform:scale(.96)}.sprint-old-version-top{width:60px;min-width:60px;gap:4px;padding:0 6px}.sprint-old-version-top span{font-size:11px;font-weight:750}.sprint-top-meta{grid-column:1/-1;grid-row:2;display:flex;min-width:0;align-items:center;justify-content:space-between;gap:12px 20px}.sprint-top-mastery{color:var(--v10-muted);font-size:12px;white-space:nowrap}.sprint-top-mastery strong{color:var(--v10-ink);font-size:14px}.sprint-countdown{display:flex;min-width:0;flex-wrap:wrap;justify-content:flex-end;gap:4px 8px;margin:0;color:var(--v10-muted);font-size:12px;text-align:right}.sprint-countdown strong{color:var(--v10-ink);font-size:15px}.sprint-countdown span{margin-left:0;color:var(--v10-warning);white-space:nowrap}.sprint-bottom-nav{height:calc(68px + env(safe-area-inset-bottom, 0px));border-top-color:var(--v10-line);background:rgba(255,255,255,.97);box-shadow:0 -6px 18px rgba(16,35,63,.04)}.sprint-bottom-nav.is-subjective{grid-template-columns:repeat(3,minmax(0,1fr))}.sprint-bottom-nav a{position:relative;gap:3px;color:#718198;font-size:11px;font-weight:700;transition:color .18s ease,transform .18s ease}.sprint-bottom-nav a:before{display:none}.sprint-bottom-nav a.is-active{color:var(--v10-primary)}.sprint-bottom-nav svg{box-sizing:border-box;width:31px;height:27px;padding:4px 5px;border-radius:8px;stroke-width:1.9;transition:background .18s ease,color .18s ease,transform .18s ease}.sprint-bottom-nav a.is-active svg{background:#eaf2ff;color:var(--v10-primary);transform:translateY(-1px)}.sprint-bottom-nav a:active svg{transform:scale(.94)}.sprint-home-footer{justify-content:space-between;gap:12px;width:100%;padding:14px 2px 8px;border-top:1px solid var(--v10-line)}.sprint-home-footer>a,.sprint-home-footer>span{display:inline-flex;align-items:center;gap:6px}.sprint-home-footer>a{min-height:36px;padding:0 10px;border-radius:7px;color:#435b76;font-weight:750}.sprint-home-footer>a:hover{background:var(--v10-primary-soft);color:var(--v10-primary)}.sprint-legal-footer{display:flex;flex-wrap:wrap;justify-content:center;gap:5px 14px;padding:4px 12px 14px;color:var(--v10-muted);font-size:12px;line-height:1.6;text-align:center}.sprint-legal-footer a{color:inherit;text-decoration:none}.sprint-legal-footer a:hover{color:var(--v10-primary);text-decoration:underline}.sprint-demo-switcher{z-index:80;border-color:var(--v10-line);border-radius:9px;box-shadow:var(--v10-shadow)}.sprint-demo-switcher select{border-color:var(--v10-line);border-radius:7px}.sprint-primary-button,.sprint-secondary-button,.sprint-submit-button{min-height:48px;border-radius:9px;font-size:15px;font-weight:800;transition:background .18s ease,border-color .18s ease,box-shadow .18s ease,transform .18s ease}.sprint-primary-button{background:var(--v10-primary);box-shadow:0 5px 13px rgba(21,94,239,.18)}.sprint-primary-button:hover,.sprint-submit-button:hover{background:#0f4fd4}.sprint-primary-button:active,.sprint-submit-button:active{transform:translateY(1px)}.sprint-secondary-button{border-color:var(--v10-line);color:var(--v10-ink)}.sprint-auth-actions{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.72fr);gap:10px;margin-top:18px;max-width:560px}.sprint-auth-actions .sprint-primary-button,.sprint-auth-actions .sprint-secondary-button{width:100%}.sprint-auth-panel{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;padding:18px;border:1px solid var(--v10-line);border-radius:var(--v10-radius);background:#fff}.sprint-auth-panel .sprint-text-action{grid-column:1/-1;display:inline-flex;min-height:44px;align-items:center;justify-content:center;gap:7px;color:var(--v10-primary);font-size:13px;font-weight:750}.sprint-auth-panel .sprint-text-action svg{width:17px;height:17px}.sprint-signout-button{display:inline-flex;min-height:46px;align-items:center;justify-content:center;gap:8px;border:1px solid #fecaca;border-radius:9px;background:#fff7f7;color:#b42318;font-size:14px;font-weight:750}.sprint-signout-button svg{width:18px;height:18px}.sprint-account-link{width:auto;min-width:44px;gap:5px;padding:0 9px;font-size:12px;font-weight:750}.sprint-feature-page,.sprint-home,.sprint-standard-page{gap:18px}.sprint-feature-page>section,.sprint-home>section,.sprint-standard-page>section{border-color:var(--v10-line);border-radius:var(--v10-radius);box-shadow:0 1px 2px rgba(16,35,63,.03)}.sprint-law-entry{margin-top:2px;border-color:#b9d2ff;border-radius:var(--v10-radius);background:var(--v10-primary-soft);color:#173b75;transition:background .18s ease,border-color .18s ease,transform .18s ease}.sprint-law-entry:hover{border-color:#8fb6ff;background:#e5efff;transform:translateY(-1px)}.sprint-law-entry strong{font-size:15px}.sprint-law-entry small{font-size:12px}.sprint-home-lead,.sprint-today{padding:clamp(20px,3vw,32px)}.sprint-year-badge{width:fit-content;padding:6px 9px;border:1px solid #b9d2ff;border-radius:6px;background:var(--v10-primary-soft);color:var(--v10-primary);font-size:12px;font-weight:800}.sprint-home-lead h1,.sprint-today h1{max-width:860px;color:var(--v10-ink);font-size:clamp(25px,4vw,36px);line-height:1.25}.sprint-home-lead>p{max-width:760px;color:#4d6079;font-size:16px;line-height:1.8}.sprint-value-line{max-width:760px;margin-top:16px;padding:12px 14px;border-left:3px solid var(--v10-primary);background:#f7faff;color:#3d536d;font-size:14px;line-height:1.7}.sprint-value-line svg{color:var(--v10-primary)}.sprint-path{margin-top:24px}.sprint-path>div{padding:12px 8px;border:1px solid #e2e9f2;border-radius:9px;background:#fbfcfe}.sprint-path>div svg{color:var(--v10-primary)}.sprint-path>div strong{font-size:14px}.sprint-path>div span{color:#64748b;font-size:12px}.sprint-ability-section,.sprint-first-use,.sprint-plans,.sprint-progress-section,.sprint-proof-band,.sprint-subject-status,.sprint-target-section{padding:20px}.sprint-section-title h2{color:var(--v10-ink);font-size:19px}.sprint-section-title a{color:var(--v10-primary);font-weight:700}.sprint-feature-item,.sprint-progress-list a,.sprint-quick-tasks a{border-color:#e2e9f2;border-radius:9px;transition:border-color .18s ease,background .18s ease,transform .18s ease}.sprint-feature-item:hover,.sprint-progress-list a:hover,.sprint-quick-tasks a:hover{border-color:#a8c7ff;background:#fbfdff;transform:translateY(-1px)}.sprint-progress-track{height:8px;background:#e8eef6}.sprint-progress-track i{background:var(--v10-primary)}.sprint-feature-number{border-color:#c8dcff;background:var(--v10-primary-soft);color:var(--v10-primary)}.sprint-plans article{border-color:var(--v10-line);border-radius:9px;box-shadow:none}.sprint-plans article.is-flagship{border-color:#a8c7ff;background:#f7faff}.sprint-plan-price strong{color:var(--v10-primary)}.sprint-plans article button{border-radius:8px;background:var(--v10-primary);color:#fff}.sprint-feature-header,.sprint-standard-page>header{padding:22px 24px}.sprint-feature-header>span,.sprint-standard-page>header>span{color:var(--v10-primary);font-size:13px;font-weight:800}.sprint-feature-header h1,.sprint-standard-page h1{margin-top:7px;color:var(--v10-ink);font-size:clamp(25px,4vw,34px);line-height:1.28}.sprint-feature-header>p,.sprint-standard-page>header p{max-width:760px;color:#52667f;font-size:15px;line-height:1.78}.sprint-hero-stat{margin-top:18px;padding:14px 16px;border:1px solid #d7e4f5;border-radius:9px;background:#fbfdff}.sprint-chip-row{display:flex;gap:8px;flex-wrap:wrap;padding:0 2px}.sprint-chip-row button{min-height:38px;padding:0 14px;border:1px solid #d7e1ed;border-radius:19px;background:#fff;color:#536982;font-size:13px;font-weight:700;transition:color .18s ease,border-color .18s ease,background .18s ease}.sprint-chip-row button.is-active{border-color:#b3ceff;background:var(--v10-primary-soft);color:var(--v10-primary)}.sprint-subject-picker-section{display:grid;gap:12px;padding:16px;border:1px solid var(--v10-line);border-radius:var(--v10-radius);background:#fff;box-shadow:0 1px 2px rgba(16,35,63,.03)}.sprint-subject-picker-section>div:first-child{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.sprint-subject-picker-section>div:first-child strong{color:var(--v10-ink);font-size:15px}.sprint-subject-picker-section>div:first-child span{color:var(--v10-muted);font-size:11px}.sprint-subject-grid{display:grid;width:100%;min-width:0;gap:8px}.sprint-course-subject-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.sprint-recite-subject-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.sprint-subject-grid button{display:grid;min-width:0;min-height:44px;place-items:center;border:1px solid #d7e1ed;border-radius:8px;background:#fff;color:#3e536d;font-size:13px;font-weight:750;transition:border-color .16s ease,background .16s ease,color .16s ease,box-shadow .16s ease}.sprint-subject-grid button:hover{border-color:#a9c6f5}.sprint-subject-grid button.is-active{border-color:#87aff2;background:var(--v10-primary-soft);color:var(--v10-primary);box-shadow:inset 0 0 0 1px rgba(23,103,232,.05)}.sprint-filter-panel select,.sprint-note-search input,.sprint-plan-page select,.sprint-search input,.sprint-trial-form input{border-color:#cbd7e6;border-radius:9px}.sprint-course-list article,.sprint-law-list article{border-color:var(--v10-line);border-radius:var(--v10-radius);box-shadow:0 1px 2px rgba(16,35,63,.03)}.sprint-course-list article>header{padding:17px}.sprint-course-list article details summary{min-height:48px;padding:0 17px;color:var(--v10-ink);font-weight:800}.sprint-course-list article a,.sprint-course-list article button.sprint-course-locked{min-height:68px;padding:10px 17px}.sprint-course-list article button.sprint-course-locked,.sprint-course-list details>a{grid-template-columns:42px minmax(0,1fr) 30px 16px;gap:8px}.sprint-lesson-index{display:grid;width:34px;height:34px;place-items:center;border-radius:8px;background:#f2f6fc;color:var(--v10-primary);font-size:12px;font-weight:850}.sprint-lesson-action{display:grid;width:28px;height:28px;place-items:center;color:#6e8199}.sprint-lesson-action svg{width:18px;height:18px}.sprint-course-list details>a:hover{background:#f9fbfe}.sprint-course-list article button.sprint-course-locked>div,.sprint-course-list details>a>div{gap:3px}.sprint-course-list article button.sprint-course-locked strong,.sprint-course-list details>a strong{color:#203650;font-size:14px;line-height:1.45}.sprint-course-list article button.sprint-course-locked small,.sprint-course-list details>a small{color:var(--v10-muted);font-size:11px}.sprint-law-page{gap:15px}.sprint-law-intro{margin-top:4px;padding:16px;border-color:#b9d2ff;border-radius:var(--v10-radius);background:var(--v10-primary-soft)}.sprint-law-overview{gap:10px}.sprint-law-overview>button{min-height:78px;border-color:var(--v10-line);border-radius:9px;background:#fff;transition:border-color .18s ease,transform .18s ease}.sprint-law-overview>button:hover{border-color:#a8c7ff;transform:translateY(-1px)}.sprint-law-subject-back{min-height:40px;color:var(--v10-primary);font-weight:750}.sprint-law-subject-title{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:3px 2px}.sprint-law-subject-title>span{color:var(--v10-primary);font-size:13px;font-weight:800}.sprint-law-subject-title strong{color:var(--v10-ink);font-size:18px}.sprint-law-list{gap:9px}.sprint-law-heading{min-height:72px;padding:12px 15px}.sprint-law-heading strong{font-size:15px}.sprint-law-heading small{color:var(--v10-muted);font-size:11px}.sprint-law-detail{gap:14px;padding:0 17px 18px;border-top-color:var(--v10-line)}.sprint-law-detail section{gap:7px;padding-top:14px}.sprint-law-detail section small{color:var(--v10-primary);font-size:11px}.sprint-law-detail section li,.sprint-law-detail section p{color:#3d536d;font-size:15px;line-height:1.85}.sprint-law-detail section.is-current{background:var(--v10-success-soft)}.sprint-law-point-link{min-height:44px;border-color:#b3ceff;border-radius:8px;background:#fff;color:var(--v10-primary);font-weight:800}.sprint-hierarchy-list{gap:12px}.sprint-hierarchy-list details{overflow:hidden;border-color:var(--v10-line);border-radius:var(--v10-radius);background:#fff;box-shadow:0 1px 2px rgba(16,35,63,.03)}.sprint-hierarchy-list details>summary{min-height:66px;padding:12px 16px;border-bottom:1px solid transparent;cursor:pointer}.sprint-hierarchy-list details[open]>summary{border-bottom-color:var(--v10-line);background:#fbfdff}.sprint-hierarchy-list details>summary>span{display:inline-flex;align-items:center;gap:6px;color:var(--v10-muted);font-size:12px}.sprint-hierarchy-list details>summary svg{width:17px;color:var(--v10-primary);transition:transform .2s ease}.sprint-hierarchy-list details[open]>summary svg{transform:rotate(180deg)}.sprint-section-group{margin:0 16px;border-top:1px solid #edf1f6}.sprint-section-heading-static{min-height:53px;padding:11px 8px 8px 10px;color:#4a617b}.sprint-section-heading-static strong{font-size:13px}.sprint-section-heading-static small,.sprint-section-heading-static>span{color:var(--v10-muted);font-size:11px}.sprint-section-heading-static>span{white-space:nowrap}.sprint-section-group>a{min-height:68px;padding:10px 8px 10px 10px;border-top:1px solid #f0f3f7}.sprint-section-group>a>div{min-width:0}.sprint-section-group>a strong{color:var(--v10-ink);font-size:14px;line-height:1.45}.sprint-section-group>a p{display:-webkit-box;overflow:hidden;color:#64748b;font-size:12px;line-height:1.55;-webkit-box-orient:vertical;-webkit-line-clamp:2}.sprint-section-group>a small{color:var(--v10-muted);font-size:11px}.sprint-section-group>a>span{width:27px;height:27px;border-radius:50%;background:#f2f5f9;color:#8b9bb0}.sprint-section-group>a>span.is-done{background:var(--v10-success-soft);color:var(--v10-success)}.sprint-section-group>a>span.is-review{background:var(--v10-warning-soft);color:var(--v10-warning)}.sprint-course-player,.sprint-reader,.sprint-reader-v7,.sprint-recite-card{background:var(--v10-surface)}.sprint-course-player>header,.sprint-reader-v7>header,.sprint-reader>header,.sprint-recite-session>header{border-bottom-color:var(--v10-line);background:rgba(255,255,255,.97)}.sprint-course-player{min-height:100dvh;padding-bottom:86px;background:var(--v10-bg)}.sprint-course-player>header{position:sticky;top:0;z-index:20;grid-template-columns:44px minmax(0,1fr) 44px;min-height:66px;padding:8px max(16px,calc((100vw - 900px) / 2));backdrop-filter:blur(12px)}.sprint-course-player>header>div{gap:2px;text-align:center}.sprint-course-player>header strong{overflow:hidden;color:var(--v10-ink);font-size:14px;text-overflow:ellipsis;white-space:nowrap}.sprint-course-player>header span{color:var(--v10-muted);font-size:11px}.sprint-course-player>header button:disabled{color:#b6c0cd;opacity:1}.sprint-course-player>main{display:grid;width:min(100%,900px);gap:16px;margin:0 auto;padding:18px 16px 28px}.sprint-course-player .sprint-video-stage{width:100%;max-height:none;overflow:hidden;border-radius:10px;background:#10213b;box-shadow:0 8px 26px rgba(16,35,63,.13)}.sprint-course-player .sprint-video-stage>button{width:58px;height:58px;border:0;color:var(--v10-primary);box-shadow:0 6px 18px rgba(0,0,0,.18)}.sprint-course-player .sprint-video-stage>span{color:#cdd8e7;font-size:12px}.sprint-course-lesson-info{padding:18px;border:1px solid var(--v10-line);border-radius:10px;background:#fff;box-shadow:var(--v10-shadow)}.sprint-course-lesson-path{display:flex;align-items:center;gap:8px}.sprint-course-lesson-path span{padding:3px 7px;border-radius:5px;background:var(--v10-primary-soft);color:var(--v10-primary);font-size:10px;font-weight:800}.sprint-course-lesson-path small{color:var(--v10-muted);font-size:11px}.sprint-course-lesson-info h1{margin-top:10px;color:var(--v10-ink);font-size:clamp(22px,4vw,29px);line-height:1.35}.sprint-course-progress-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:20px;color:var(--v10-muted);font-size:12px}.sprint-course-progress-head span{display:inline-flex;align-items:center;gap:5px}.sprint-course-progress-head svg{width:15px}.sprint-course-progress-head strong{color:#3e536d;font-size:12px}.sprint-course-lesson-info .sprint-video-progress{height:7px;margin-top:9px;background:#e8edf4}.sprint-course-material{display:grid;grid-template-columns:34px minmax(0,1fr) 18px;width:100%;min-height:62px;align-items:center;gap:10px;margin-top:18px;padding:8px 10px;border:1px solid #d7e4f5;border-radius:8px;background:#f8fbff;text-align:left}.sprint-course-material>svg:first-child{width:21px;color:var(--v10-primary)}.sprint-course-material>span{display:grid;gap:2px}.sprint-course-material strong{color:#203650;font-size:13px}.sprint-course-material small{color:var(--v10-muted);font-size:10px}.sprint-course-material>svg:last-child{width:16px;color:#718198}.sprint-course-player>footer{left:50%;width:min(100%,900px);min-height:calc(70px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);align-items:center;padding:8px 12px env(safe-area-inset-bottom,0);border-inline:1px solid var(--v10-line)}.sprint-course-player>footer a,.sprint-course-player>footer button{min-height:48px;border-radius:8px}.sprint-course-player>footer a{border-color:transparent;color:#52667f}.sprint-course-player>footer a.is-disabled{pointer-events:none;color:#b1bbc8}.sprint-course-player>footer button{display:inline-flex;gap:6px}.sprint-course-player>footer button 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