.GradeSelection_section__Fmha1{padding:56px 0 24px;text-align:left;background:#f8fafc}.GradeSelection_container__ToiyG{max-width:1140px;margin:0 auto;padding:0 24px}.GradeSelection_head__CHHE7{margin:0 auto 36px;max-width:680px;text-align:center}.GradeSelection_eyebrow__A41Wm{display:inline-block;text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:600;color:#00bfff}.GradeSelection_title__aL42X{font-size:36px;font-weight:800;line-height:1.18;color:#0f172a;margin:12px 0;letter-spacing:-.015em}.GradeSelection_titleAccent__feEb4{color:#00bfff}.GradeSelection_subtitle__OzoVU{font-size:17px;color:#475569;line-height:1.6}.GradeSelection_grid__W_Rwb{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}.GradeSelection_card__h5lTo{position:relative;display:block;background:#fff;border:1px solid #e2e8f0;border-radius:20px;padding:24px;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s,border-color .2s;overflow:hidden}.GradeSelection_card__h5lTo:hover{transform:translateY(-4px);border-color:#00bfff;box-shadow:0 14px 32px rgba(0,150,214,.14)}.GradeSelection_gradeNum__haLO3{font-size:44px;font-weight:800;line-height:1;color:var(--custom-blue)}.GradeSelection_card__h5lTo.GradeSelection_abi__iX0lw .GradeSelection_gradeNum__haLO3{color:#f59e0b}.GradeSelection_card__h5lTo.GradeSelection_abi__iX0lw:hover{border-color:#f59e0b;box-shadow:0 14px 32px rgba(245,158,11,.16)}.GradeSelection_gradeLabel__r95Qk{font-size:12px;font-weight:600;color:#64748b;text-transform:uppercase;letter-spacing:.08em;margin:4px 0 14px}.GradeSelection_gradeTitle__6L7sK{font-size:15px;font-weight:700;color:#0f172a;margin:0 0 6px}.GradeSelection_gradeTopics__HRCiw{font-size:12.5px;color:#64748b;line-height:1.5;margin:0}.GradeSelection_count__DhBKN{font-size:11.5px;font-weight:600;color:#64748b;margin-top:14px}.GradeSelection_arrow__YyZ9U{position:absolute;top:20px;right:20px;width:30px;height:30px;border-radius:50%;background:#f1f5f9;color:#64748b;display:flex;align-items:center;justify-content:center;transition:background .2s,color .2s}.GradeSelection_card__h5lTo:hover .GradeSelection_arrow__YyZ9U{background:#0096d6;color:#fff}.GradeSelection_card__h5lTo.GradeSelection_abi__iX0lw:hover .GradeSelection_arrow__YyZ9U{background:#f59e0b}@media (max-width:640px){.GradeSelection_section__Fmha1{padding:40px 0 16px}.GradeSelection_title__aL42X{font-size:26px}.GradeSelection_grid__W_Rwb{grid-template-columns:repeat(2,1fr);gap:12px}.GradeSelection_card__h5lTo{padding:18px}.GradeSelection_gradeNum__haLO3{font-size:34px}}.GradeHero_hero__U4LHt{padding:44px 0 28px;text-align:left;background:#f8fafc;margin-top:65px}.GradeHero_container__25z4O{max-width:1140px;margin:0 auto;padding:0 24px}.GradeHero_crumb__XMPpw{font-size:13.5px;color:#64748b;margin-bottom:10px}.GradeHero_crumb__XMPpw a{color:#0096d6;text-decoration:none;font-weight:600}.GradeHero_crumb__XMPpw a:hover{text-decoration:underline}.GradeHero_title__TMR7p{font-size:38px;font-weight:800;color:#0f172a;letter-spacing:-.015em;margin:0 0 8px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}.GradeHero_pill__A8GzD{display:inline-block;padding:5px 16px;background:var(--custom-blue);color:#fff;border-radius:999px;font-size:19px;font-weight:700}.GradeHero_lead__Xj5O0{font-size:16.5px;color:#475569;line-height:1.6;margin:0 0 22px;max-width:640px}.GradeHero_switcher__T7NN5{display:flex;gap:8px;flex-wrap:wrap}.GradeHero_switchPill__gcVVL{padding:7px 15px;border-radius:999px;font-size:13.5px;font-weight:700;background:#f1f5f9;color:#475569;text-decoration:none;border:1px solid transparent;transition:all .15s}.GradeHero_switchPill__gcVVL:hover{border-color:#00bfff;color:#0077b6;background:#fff}.GradeHero_switchPill__gcVVL.GradeHero_active__z7iag{background:var(--custom-blue);color:#fff}@media (max-width:640px){.GradeHero_hero__U4LHt{padding:28px 0 18px;margin-top:45px}.GradeHero_title__TMR7p{font-size:27px}.GradeHero_pill__A8GzD{font-size:15px}}.GradeChapterList_section__hVZ3Z{padding:8px 0 48px;text-align:left;background:#f6f8fb;color:#0f2033}.GradeChapterList_container__eQ0zx{max-width:1180px;margin:0 auto;padding:0 32px}.GradeChapterList_group__aPKe3{background:#fff;border:1px solid #e7edf4;border-radius:14px;margin-bottom:12px;overflow:hidden}.GradeChapterList_headWrap__hycXm{margin:0;font-size:inherit;font-weight:inherit}.GradeChapterList_groupHead__kFqEW{width:100%;display:flex;align-items:center;gap:13px;padding:15px 18px;background:none;border:0;cursor:pointer;text-align:left;font:inherit;transition:background-color .16s ease}.GradeChapterList_groupHead__kFqEW:hover{background-color:#f6f8fb}.GradeChapterList_groupNo__ypEse{flex:none;display:grid;place-items:center;min-width:32px;height:30px;padding:0 9px;border-radius:8px;background:rgba(0,191,255,.14);color:#0077a3;font-size:12.5px;font-weight:700;letter-spacing:.02em}.GradeChapterList_groupTitle__12YBG{flex:1;margin:0;font-size:16.5px;font-weight:700;letter-spacing:-.01em;color:#0b2545;min-width:0}.GradeChapterList_groupMeta__HtIYA{font-size:12.5px;font-weight:600;color:#94a3b8;white-space:nowrap}.GradeChapterList_chev__bleuc{color:#94a3b8;transition:transform .2s ease;flex-shrink:0}.GradeChapterList_group__aPKe3.GradeChapterList_open__yjh0O .GradeChapterList_chev__bleuc{transform:rotate(180deg)}.GradeChapterList_groupBody__ojW32{display:none}.GradeChapterList_group__aPKe3.GradeChapterList_open__yjh0O .GradeChapterList_groupBody__ojW32{display:block}.GradeChapterList_cards__X437Y{list-style:none;margin:0;padding:0 0 0 32px;border-top:1px solid #e7edf4}.GradeChapterList_cards__X437Y li+li .GradeChapterList_card__zDY7B{border-top:1px solid #e7edf4}.GradeChapterList_card__zDY7B{display:flex;align-items:center;gap:14px;padding:14px 18px;text-decoration:none;color:inherit;transition:background-color .16s ease}.GradeChapterList_card__zDY7B:hover{background:#eaf5fd}.GradeChapterList_cardNo__Ks5tU{flex:none;display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:rgba(0,191,255,.14);color:#0077a3;font-size:13px;font-weight:700}.GradeChapterList_info__KWXlq{flex:1 1 auto;min-width:0}.GradeChapterList_cardTitle__iIMvh{display:block;font-size:15px;font-weight:650;color:#0b2545;letter-spacing:-.01em;line-height:1.35;margin-bottom:2px}.GradeChapterList_card__zDY7B:hover .GradeChapterList_cardTitle__iIMvh{color:#2f92ce}.GradeChapterList_cardSub__0iYZs{display:block;font-size:13px;color:#64748b}.GradeChapterList_tags__tlh6G{flex:none;display:inline-flex;align-items:center;gap:6px;flex-wrap:wrap;justify-content:flex-end}.GradeChapterList_tag__tQDDh{display:inline-flex;align-items:center;gap:4px;padding:4px 9px;border-radius:999px;font-size:11.5px;font-weight:600;white-space:nowrap;background:#f1f5f9;color:#64748b}.GradeChapterList_tag__tQDDh svg{width:12px;height:12px;flex:none}.GradeChapterList_tagPremium__zu83v{background:#fdf0e2;color:#d97b32}.GradeChapterList_tagSoon__Druke{background:#eef2f7;color:#94a3b8}.GradeChapterList_cardArrow__kSC8n{flex:none;width:16px;height:16px;color:#94a3b8;transition:transform .16s ease,color .16s ease}.GradeChapterList_card__zDY7B:hover .GradeChapterList_cardArrow__kSC8n{color:#2f92ce;transform:translateX(3px)}@media (max-width:640px){.GradeChapterList_container__eQ0zx{padding:0 16px}.GradeChapterList_groupHead__kFqEW{padding:14px 16px}.GradeChapterList_groupMeta__HtIYA{display:none}.GradeChapterList_card__zDY7B{padding:13px 16px;gap:12px}.GradeChapterList_cards__X437Y{padding-left:18px}.GradeChapterList_tagTime__le_vs{display:none}}.ChapterScreen_section__ZoZsF{padding:36px 0 72px;text-align:left;background:#f6f8fb;margin-top:65px;color:#0f2033;line-height:1.5}.ChapterScreen_container__znVc_{max-width:1180px;margin:0 auto;padding:0 32px}.ChapterScreen_layout__0RTmt{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px;align-items:start}.ChapterScreen_main__g_5Th{min-width:0}.ChapterScreen_crumb__xEQOP{font-size:13.5px;color:#64748b;margin-bottom:18px}.ChapterScreen_crumb__xEQOP a{color:#2f92ce;text-decoration:none;font-weight:550}.ChapterScreen_crumb__xEQOP a:hover{text-decoration:underline}.ChapterScreen_crumb__xEQOP span{margin:0 5px;color:#94a3b8}.ChapterScreen_pageHead__oUMnb{display:flex;align-items:center;gap:14px;margin-bottom:6px}.ChapterScreen_chapterNo__3JNni{flex:none;display:grid;place-items:center;width:36px;height:36px;border-radius:9px;background:rgba(0,191,255,.14);color:#0077a3;font-size:15px;font-weight:700;font-variant-numeric:tabular-nums}.ChapterScreen_title___W_Do{margin:0;font-size:32px;font-weight:750;letter-spacing:-.025em;color:#0b2545;line-height:1.15}.ChapterScreen_pageMeta__373kn{margin:0 0 32px 50px;font-size:14px;color:#64748b}.ChapterScreen_pageMeta__373kn b{color:#0f2033;font-weight:600}.ChapterScreen_sectionLabel__yQxdS{font-size:11px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:#94a3b8;margin:0 0 12px}.ChapterScreen_topics__WC6gB{list-style:none;margin:0 0 32px;padding:0;background:#fff;border:1px solid #e7edf4;border-radius:14px;overflow:hidden}.ChapterScreen_topics__WC6gB li+li{border-top:1px solid #e7edf4}.ChapterScreen_topic__EpIpa{display:flex;align-items:center;gap:14px;padding:16px 18px;text-decoration:none;color:inherit;transition:background-color .16s ease}.ChapterScreen_topic__EpIpa:hover{background:#eaf5fd}.ChapterScreen_topicNo___HOOY{flex:none;display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:rgba(0,191,255,.14);color:#0077a3;font-size:13px;font-weight:700}.ChapterScreen_topicBody__9dCb6{flex:1 1 auto;min-width:0}.ChapterScreen_topicTitle__8dtHo{display:block;font-size:15.5px;font-weight:650;color:#0b2545;letter-spacing:-.01em;margin-bottom:2px}.ChapterScreen_topicParts__EAsEO{font-size:13px;color:#64748b}.ChapterScreen_lock__i8C__{flex:none;display:inline-flex;align-items:center;gap:5px;padding:4px 9px;border-radius:999px;background:#fdf0e2;color:#d97b32;font-size:11.5px;font-weight:650;white-space:nowrap}.ChapterScreen_lock__i8C__ svg{width:11px;height:11px}.ChapterScreen_topicArrow___56P7{flex:none;width:16px;height:16px;color:#94a3b8;transition:transform .16s ease,color .16s ease}.ChapterScreen_topic__EpIpa:hover .ChapterScreen_topicArrow___56P7{color:#2f92ce;transform:translateX(3px)}.ChapterScreen_chapterNav__kqz9b{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:32px}.ChapterScreen_chNavBtn__PbMaK{position:relative;display:flex;align-items:center;gap:13px;padding:15px 17px;background:#fff;border:1px solid #e7edf4;border-radius:14px;text-decoration:none;overflow:hidden;transition:border-color .18s ease,background-color .18s ease,box-shadow .18s ease}.ChapterScreen_chNavBtn__PbMaK:before{content:"";position:absolute;top:0;bottom:0;width:3px;background:#5ab8ee;opacity:.6;transition:width .18s ease,opacity .18s ease}.ChapterScreen_chNavPrev__p21Bk:before{left:0}.ChapterScreen_chNavNext__mFY9d:before{right:0}.ChapterScreen_chNavBtn__PbMaK:hover{background:#eaf5fd;border-color:#c6e3f6;box-shadow:0 10px 24px -16px rgba(11,37,69,.4)}.ChapterScreen_chNavBtn__PbMaK:hover:before{width:5px;opacity:1}.ChapterScreen_chNavNext__mFY9d{flex-direction:row-reverse;text-align:right}.ChapterScreen_navIcon__xarC9{flex:none;display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:#eaf5fd;color:#2f92ce;transition:background-color .18s ease,transform .18s ease}.ChapterScreen_navIcon__xarC9 svg{width:15px;height:15px}.ChapterScreen_chNavBtn__PbMaK:hover .ChapterScreen_navIcon__xarC9{background:#fff}.ChapterScreen_chNavPrev__p21Bk:hover .ChapterScreen_navIcon__xarC9{transform:translateX(-3px)}.ChapterScreen_chNavNext__mFY9d:hover .ChapterScreen_navIcon__xarC9{transform:translateX(3px)}.ChapterScreen_navText__CvfkG{min-width:0}.ChapterScreen_chNavLabel__uSaeK{display:block;font-size:10.5px;font-weight:650;letter-spacing:.07em;text-transform:uppercase;color:#64748b;margin-bottom:2px}.ChapterScreen_chNavTitle__eafZp{display:block;font-size:15px;font-weight:650;color:#0b2545;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.ChapterScreen_chNavDisabled__gBYqe{pointer-events:none;opacity:.55}.ChapterScreen_chNavDisabled__gBYqe:before{opacity:.25}.ChapterScreen_relatedBox__ffaOY{background:#fff;border:1px solid #e7edf4;border-radius:14px;padding:18px 18px 6px}.ChapterScreen_relatedHead__7syqL{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:0 0 12px}.ChapterScreen_relatedHeadTitle__7Q72P{margin:0;font-size:16px;font-weight:700;color:#0b2545;letter-spacing:-.01em}.ChapterScreen_allLink__0LLNQ{flex:none;font-size:13px;font-weight:600;color:#2f92ce;text-decoration:none;white-space:nowrap}.ChapterScreen_allLink__0LLNQ:hover{text-decoration:underline}.ChapterScreen_relatedList__fO9s5{display:flex;flex-direction:column}.ChapterScreen_relatedLink__U0ta6{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 4px;border-top:1px solid #e7edf4;text-decoration:none;color:#0b2545;transition:color .16s ease}.ChapterScreen_relatedLinkTitle__oGgWA{font-size:14.5px;font-weight:600;line-height:1.35}.ChapterScreen_relatedLink__U0ta6:hover{color:#2f92ce}.ChapterScreen_relArrow__uP7aR{flex:none;color:#94a3b8;transition:color .16s ease,transform .16s ease}.ChapterScreen_relArrow__uP7aR svg{width:15px;height:15px;display:block}.ChapterScreen_relatedLink__U0ta6:hover .ChapterScreen_relArrow__uP7aR{color:#2f92ce;transform:translateX(3px)}.ChapterScreen_side__GFlFd{display:flex;flex-direction:column;gap:14px;position:sticky;top:90px}.ChapterScreen_promo__iPiJZ{border-radius:16px;padding:20px;background:linear-gradient(160deg,#123a63,#0b2545);color:#fff}.ChapterScreen_promoTitle__uw6ji{margin:0 0 3px;font-size:17px;font-weight:700;letter-spacing:-.01em}.ChapterScreen_price__E2dC5{margin:0 0 14px;font-size:13px;color:#9fbbd4}.ChapterScreen_promoList__Ei18Z{list-style:none;margin:0 0 16px;padding:0;display:flex;flex-direction:column;gap:7px}.ChapterScreen_promoList__Ei18Z li{display:flex;align-items:center;gap:8px;font-size:13.5px;color:#d6e5f2}.ChapterScreen_promoList__Ei18Z li svg{flex:none;width:13px;height:13px;color:#5ab8ee}.ChapterScreen_promoCta__6kpH5{display:flex;align-items:center;justify-content:center;gap:7px;width:100%;padding:12px;border-radius:10px;background:var(--custom-blue);color:#fff;font-size:14.5px;font-weight:700;text-decoration:none;transition:all .18s ease}.ChapterScreen_promoCta__6kpH5:hover{transform:translateY(-1px);background:#0096d6}.ChapterScreen_promoCta__6kpH5 svg{width:15px;height:15px;transition:transform .18s ease}.ChapterScreen_promoCta__6kpH5:hover svg{transform:translateX(2px)}.ChapterScreen_sideCard__8QWzw{background:#fff;border:1px solid #e7edf4;border-radius:14px;overflow:hidden}.ChapterScreen_sideCard__8QWzw>.ChapterScreen_sectionLabel__yQxdS{margin:0;padding:14px 16px 10px}.ChapterScreen_sideRow__QxBYK{display:flex;align-items:center;gap:11px;padding:12px 16px;border-top:1px solid #e7edf4;text-decoration:none;color:inherit;transition:background-color .16s ease}.ChapterScreen_sideRow__QxBYK:hover{background:#eaf5fd}.ChapterScreen_sideIcon__DOBP_{flex:none;display:grid;place-items:center;width:32px;height:32px;border-radius:9px;background:#eaf5fd;overflow:hidden}.ChapterScreen_sideText___wJHC{flex:1 1 auto;min-width:0}.ChapterScreen_sideTitle__TbBnG{display:block;font-size:14px;font-weight:650;color:#0b2545}.ChapterScreen_sideSub__Z_VTg{display:block;font-size:12.5px;color:#64748b}.ChapterScreen_sideChevron__mRiyV{flex:none;width:14px;height:14px;color:#94a3b8;transition:transform .16s ease}.ChapterScreen_sideRow__QxBYK:hover .ChapterScreen_sideChevron__mRiyV{transform:translateX(2px)}@media (prefers-reduced-motion:reduce){.ChapterScreen_section__ZoZsF *{transition:none!important}}@media (max-width:900px){.ChapterScreen_section__ZoZsF{padding:24px 0 56px;margin-top:45px}.ChapterScreen_container__znVc_{padding:0 16px}.ChapterScreen_layout__0RTmt{grid-template-columns:1fr;gap:24px}.ChapterScreen_side__GFlFd{position:static}.ChapterScreen_chapterNav__kqz9b{grid-template-columns:1fr}.ChapterScreen_title___W_Do{font-size:26px}.ChapterScreen_pageMeta__373kn{margin-left:0}}