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var(--line);display:grid;place-items:center;font-size:12px;color:var(--blue);background:#fff}.start-banner{padding-top:30px}.start-banner__box{border:1px solid var(--line);border-radius:25px;padding:28px;background:#fff;box-shadow:var(--shadow-sm);display:grid;grid-template-columns:65px 1fr auto;gap:20px;align-items:center}.start-banner__icon{width:62px;height:62px;border-radius:20px;background:#eef2ff;display:grid;place-items:center;font-size:30px}.start-banner h2{margin:5px 0;color:var(--ink);font-size:24px}.start-banner p{margin:0;color:var(--muted);font-size:10px}
.lesson-header{height:68px;background:#0f1c43;color:#fff;position:sticky;top:0;z-index:50}.lesson-header__inner{height:100%;display:grid;grid-template-columns:1fr 400px 1fr;align-items:center}.lesson-back{font-size:10px;color:#c4d0f2;font-weight:700}.lesson-head-progress{display:flex;align-items:center;gap:10px}.lesson-head-progress>span{font-size:9px;white-space:nowrap;color:#aebce7}.lesson-head-progress>div{height:6px;background:rgba(255,255,255,.1);border-radius:20px;flex:1;overflow:hidden}.lesson-head-progress i{height:100%;display:block;background:#79d7cf;border-radius:20px}.profile-button--light{justify-self:end;background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.12);color:#fff}.lesson-page{background:#f7f9fc;min-height:100vh}.lesson-hero{background:#fff;border-bottom:1px solid var(--line);padding:48px 0}.lesson-hero__grid{display:grid;grid-template-columns:1fr 380px;gap:60px;align-items:center}.lesson-world{display:inline-flex;background:#eef2ff;color:var(--blue);font-size:9px;font-weight:800;padding:7px 10px;border-radius:999px}.lesson-hero h1{font-size:45px;letter-spacing:-.045em;line-height:1.08;color:var(--ink);margin:13px 0}.lesson-hero p{color:var(--muted);line-height:1.7}.lesson-meta{display:flex;gap:18px;font-size:9px;color:#69768e;font-weight:700;margin-top:20px}.lesson-objective{border:1px solid var(--line);border-radius:20px;padding:20px;background:#fbfcff}.lesson-objective>span{font-size:9px;text-transform:uppercase;letter-spacing:.08em;color:var(--blue);font-weight:800}.lesson-objective ul{padding-left:18px;margin-bottom:0}.lesson-objective li{font-size:10px;color:#59677f;margin:9px 0;line-height:1.5}.lesson-content{padding:35px 0 80px}.lesson-layout{display:grid;grid-template-columns:220px 1fr;gap:24px;align-items:start}.lesson-sidebar{position:sticky;top:92px}.lesson-sidebar nav{background:#fff;border:1px solid var(--line);border-radius:18px;padding:9px}.lesson-sidebar nav a{display:flex;gap:9px;align-items:center;border-radius:11px;padding:10px;font-size:9px;color:#6b7890;font-weight:700}.lesson-sidebar nav a span{width:25px;height:25px;border-radius:8px;background:#f2f4f8;display:grid;place-items:center;font-size:8px}.lesson-sidebar nav a.active{background:#eef2ff;color:var(--blue)}.lesson-sidebar nav a.active span{background:#fff}.sidebar-xp{margin-top:10px;border-radius:18px;background:var(--dark);color:#fff;padding:17px}.sidebar-xp span,.sidebar-xp small,.sidebar-xp strong{display:block}.sidebar-xp span{font-size:8px;color:#aebce5}.sidebar-xp strong{font-size:28px;margin:5px 0}.sidebar-xp small{font-size:8px;color:#8294c5}.lesson-main{display:grid;gap:18px}.lesson-block{background:#fff;border:1px solid var(--line);border-radius:23px;padding:27px;scroll-margin-top:90px}.block-label{font-size:9px;font-weight:800;text-transform:uppercase;letter-spacing:.09em;color:var(--blue)}.lesson-block>h2,.practice-title h2{font-size:28px;color:var(--ink);letter-spacing:-.035em;margin:7px 0 22px}.theory-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.theory-card{border-radius:16px;background:#f7f9fd;padding:17px}.theory-card h3{margin:0 0 8px;color:var(--ink);font-size:13px}.theory-card p{font-size:10px;color:#647188;line-height:1.7;margin:0}.theory-card .formula{margin-top:12px;border-radius:11px;background:#fff;padding:10px;font-size:13px;font-weight:800;color:var(--blue);text-align:center}.examples-grid{display:grid;gap:10px}.example-card{border:1px solid var(--line);border-radius:16px;padding:17px;display:grid;grid-template-columns:38px 1fr;gap:12px}.example-no{width:35px;height:35px;border-radius:11px;background:#eef2ff;color:var(--blue);display:grid;place-items:center;font-size:10px;font-weight:800}.example-card strong{color:var(--ink);font-size:12px}.example-card p{font-size:10px;color:var(--muted);line-height:1.7;margin:6px 0 0}.practice-title{display:flex;justify-content:space-between;align-items:center}.practice-title h2{margin-bottom:5px}.practice-title p{font-size:9px;color:var(--muted)}.task-counter{width:55px;height:55px;border-radius:16px;background:#eef2ff;display:flex;align-items:center;justify-content:center;gap:2px;color:var(--blue);font-size:10px}.task-counter strong{font-size:17px}.quiz-card{border-radius:19px;background:#f8f9fd;padding:23px}.quiz-progress{height:6px;background:#e4e8f1;border-radius:20px;overflow:hidden;margin-bottom:20px}.quiz-progress i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--violet));border-radius:20px}.quiz-tag{font-size:8px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 9px;color:var(--blue);font-weight:800}.quiz-card h3{font-size:20px;color:var(--ink);margin:14px 0 18px}.answers-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.answer-btn{border:1px solid #dfe4ee;border-radius:13px;background:#fff;text-align:left;padding:12px 14px;font-size:10px;font-weight:700;color:#4f5d75}.answer-btn:hover{border-color:#aebfff}.answer-btn.correct{border-color:#8bd7ba;background:#edf9f4;color:#08734b}.answer-btn.wrong{border-color:#f0ae9b;background:#fff3ef;color:#a64125}.answer-btn:disabled{cursor:default}.feedback{margin-top:13px;border-radius:12px;padding:0;font-size:10px;line-height:1.6}.feedback.show{padding:12px}.feedback.good{background:#edf9f4;color:#08734b}.feedback.bad{background:#fff3ef;color:#9f442b}.quiz-next{margin-top:12px}.finish-block{text-align:center;padding:36px}.finish-icon{font-size:42px}.finish-block h2{margin-bottom:8px}.finish-block>p{color:var(--muted);font-size:10px}.finish-stats{display:flex;justify-content:center;gap:10px;margin:22px 0}.finish-stats div{min-width:115px;border:1px solid var(--line);border-radius:14px;padding:12px}.finish-stats strong,.finish-stats span{display:block}.finish-stats strong{font-size:18px;color:var(--ink)}.finish-stats span{font-size:8px;color:var(--muted);margin-top:3px}.finish-block .btn{margin:4px}
@media(max-width:980px){.main-nav{display:none;position:absolute;left:20px;right:20px;top:72px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px;flex-direction:column;align-items:stretch;box-shadow:var(--shadow)}.main-nav.open{display:flex}.main-nav a.active:after{display:none}.nav-toggle{display:block}.site-header .profile-button{display:none}.hero-home__grid,.grade5-promo__grid,.course-showcase,.grade-hero__grid,.lesson-hero__grid{grid-template-columns:1fr}.hero-demo{max-width:620px;margin:auto;width:100%}.proof-strip,.steps-grid,.world-summary{grid-template-columns:1fr 1fr}.course-mini-grid{grid-template-columns:1fr 1fr}.grade-profile-card{max-width:520px}.lesson-header__inner{grid-template-columns:1fr 1fr}.lesson-head-progress{display:none}.lesson-layout{grid-template-columns:1fr}.lesson-sidebar{display:none}}
@media(max-width:640px){.shell{width:min(100% - 28px,1180px)}.announcement__inner span:nth-child(2),.announcement__inner span:nth-child(3){display:none}.site-header{height:68px}.hero-home{padding:62px 0 80px}.hero-copy h1{font-size:45px}.hero-lead{font-size:15px}.hero-actions,.grade-hero__actions{flex-direction:column}.hero-actions .btn,.grade-hero__actions .btn{width:100%}.hero-trust{justify-content:space-between;gap:10px}.hero-demo{padding:5px}.float-card{display:none}.proof-strip{grid-template-columns:1fr;margin-top:-25px}.proof-strip>div{border-right:0;border-bottom:1px solid var(--line)}.section{padding:64px 0}.steps-grid,.world-summary,.worlds-preview,.course-mini-grid,.theory-grid,.answers-grid{grid-template-columns:1fr}.split-title,.map-head{display:block}.course-big{min-height:360px}.pricing-card{grid-template-columns:1fr}.final-cta__box,.start-banner__box{display:flex;flex-direction:column;align-items:flex-start}.footer__grid{flex-direction:column;align-items:flex-start;gap:18px}.grade-hero{padding:55px 0}.grade-hero h1{font-size:48px}.map-filter{margin-top:15px}.world-block__head{grid-template-columns:48px 1fr}.world-block__count{display:none}.mission-row{grid-template-columns:38px 1fr}.mission-status{display:none}.lesson-hero h1{font-size:36px}.lesson-meta{flex-wrap:wrap}.lesson-block{padding:20px}.practice-title{align-items:flex-start}.task-counter{width:48px;height:48px;flex:0 0 48px}.quiz-card{padding:17px}}


/* V4: richer long-form lessons */
.lesson-hero{padding:58px 0 52px}
.lesson-hero h1{font-size:clamp(38px,5vw,58px);max-width:800px}
.lesson-hero p{font-size:16px;line-height:1.8;max-width:820px}
.lesson-meta{font-size:12px;gap:22px;flex-wrap:wrap}
.lesson-objective{padding:25px}
.lesson-objective>span{font-size:11px}
.lesson-objective li{font-size:14px;line-height:1.65;margin:10px 0}

.lesson-layout{grid-template-columns:235px minmax(0,1fr);gap:28px}
.lesson-sidebar nav a{font-size:12px;padding:12px}
.lesson-sidebar nav a span{font-size:10px}
.sidebar-xp span,.sidebar-xp small{font-size:10px}
.lesson-main{gap:24px}
.lesson-block{padding:34px;border-radius:26px}
.block-label{font-size:11px}
.lesson-block>h2,.practice-title h2{font-size:34px;margin:9px 0 26px}
.lesson-block .section-lead{font-size:15px;line-height:1.75;color:var(--muted);margin:-12px 0 24px}

.warmup-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:20px}
.warmup-card{border:1px solid var(--line);background:#fff;border-radius:18px;text-align:left;padding:18px;min-height:145px;transition:.2s;position:relative}
.warmup-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.warmup-card>span{width:30px;height:30px;border-radius:10px;background:#edf2ff;color:var(--blue);display:grid;place-items:center;font-weight:800;font-size:11px}
.warmup-card p{font-size:15px;line-height:1.55;color:var(--ink);font-weight:700;margin:16px 0 10px}
.warmup-card small{font-size:10px;color:var(--muted)}
.warmup-card.open{border-color:#9db2ff;background:#f7f9ff}

.theory-grid{grid-template-columns:1fr;gap:14px}
.theory-card.rich{display:grid;grid-template-columns:54px 1fr;gap:18px;padding:24px;border:1px solid var(--line);background:linear-gradient(135deg,#fafbff,#f6f8fe)}
.theory-index{width:48px;height:48px;border-radius:15px;background:#fff;box-shadow:var(--shadow-sm);display:grid;place-items:center;color:var(--blue);font-size:12px;font-weight:800}
.theory-card.rich h3{font-size:21px;margin:0 0 10px}
.theory-card.rich p{font-size:16px;line-height:1.8;color:#4e5d77}
.theory-card.rich .formula{font-size:20px;padding:14px 16px;margin-top:16px;background:#fff;border:1px solid #e8ecf6}

.examples-grid{grid-template-columns:1fr 1fr;display:grid;gap:14px}
.worked-example{border:1px solid var(--line);border-radius:20px;padding:22px;background:#fff}
.worked-head span{font-size:10px;text-transform:uppercase;letter-spacing:.1em;color:var(--blue);font-weight:800}
.worked-head h3{font-size:20px;color:var(--ink);margin:7px 0 16px}
.worked-example ol{margin:0;padding-left:24px}
.worked-example li{font-size:14px;line-height:1.65;color:#56647c;margin:8px 0;padding-left:4px}
.worked-answer{margin-top:18px;padding:13px 15px;background:#eef8f4;border-radius:13px;display:flex;align-items:center;justify-content:space-between;gap:15px}
.worked-answer span{font-size:10px;color:#4a806b;text-transform:uppercase;font-weight:800}
.worked-answer strong{font-size:16px;color:#08734b}

.lab-panel{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:stretch}
.lab-card{border-radius:20px;padding:22px;background:linear-gradient(135deg,#132454,#283f91);color:#fff;min-height:210px}
.lab-card.light{background:linear-gradient(135deg,#f3f6ff,#f8f4ff);color:var(--ink);border:1px solid #e4e9f8}
.lab-card .lab-icon{font-size:30px}
.lab-card h3{font-size:21px;margin:18px 0 9px}
.lab-card p{font-size:13px;line-height:1.7;color:#cbd5f4}
.lab-card.light p{color:var(--muted)}
.lab-card ul{padding-left:18px}
.lab-card li{font-size:12px;line-height:1.7;margin:6px 0}

.practice-title p{font-size:13px;line-height:1.6}
.task-counter{width:64px;height:64px;font-size:13px}
.task-counter strong{font-size:21px}
.quiz-card{padding:28px;border:1px solid #e4e8f2}
.quiz-tag{font-size:10px}
.quiz-card h3{font-size:25px;line-height:1.4;margin:16px 0 22px}
.answers-grid{gap:11px}
.answer-btn{font-size:14px;line-height:1.45;padding:15px 16px;min-height:54px}
.feedback{font-size:13px;line-height:1.65}
.input-task{display:grid;grid-template-columns:1fr auto;gap:10px}
.input-task input{border:2px solid #dfe5f0;background:#fff;border-radius:14px;padding:15px 16px;font-size:17px;outline:none}
.input-task input:focus{border-color:#8fa7ff}
.input-task input.input-correct{border-color:#65c79f;background:#f0fbf6}
.input-task input.input-wrong{border-color:#ef9c87;background:#fff5f2}
.classify-object{font-size:30px;font-weight:800;text-align:center;padding:25px;background:#fff;border:1px dashed #cad3e8;border-radius:16px;margin-bottom:15px;color:var(--ink)}
.order-zone{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:15px}
.order-chip{border:1px solid #cfd7e7;background:#fff;border-radius:13px;padding:12px 15px;font-size:14px;font-weight:800;color:var(--ink)}
.order-chip:disabled{opacity:.35}
.order-picked{min-height:64px;border:1px dashed #bfc9dc;border-radius:15px;padding:12px;display:flex;gap:8px;align-items:center;flex-wrap:wrap;background:#fff}
.order-picked span{font-size:11px;color:var(--muted)}
.order-picked b{background:#edf2ff;color:var(--blue);padding:8px 10px;border-radius:10px;font-size:12px}
.task-actions{display:flex;gap:9px;margin-top:12px}
.fraction-paint{display:grid;gap:5px;margin:18px 0}
.paint-cell{height:65px;border:2px solid #cfd7e8;background:#fff;border-radius:8px;transition:.15s}
.paint-cell.selected{background:linear-gradient(135deg,#537dff,#7b55ef);border-color:#4e72e4;transform:translateY(-3px)}
.paint-counter{font-size:13px;color:var(--muted);margin:10px 0 15px}

.sprint-wrap{display:grid;grid-template-columns:1fr 260px;gap:18px;align-items:stretch}
.sprint-game{background:linear-gradient(135deg,#111d44,#253a83);color:#fff;border-radius:22px;padding:25px}
.sprint-top{display:flex;justify-content:space-between;align-items:center}
.sprint-top span{font-size:11px;color:#aebce7;font-weight:800}
.sprint-game h3{font-size:30px;margin:25px 0 18px}
.sprint-input-row{display:grid;grid-template-columns:1fr auto;gap:9px}
.sprint-input-row input{border:0;border-radius:13px;padding:14px 15px;font-size:18px;outline:none}
.sprint-feedback{min-height:38px;font-size:12px;line-height:1.5;color:#d2dcfb;margin-top:12px}
.sprint-stats{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sprint-stat{border:1px solid var(--line);border-radius:18px;padding:20px;background:#fff}
.sprint-stat span,.sprint-stat strong{display:block}
.sprint-stat span{font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:.07em}
.sprint-stat strong{font-size:32px;color:var(--ink);margin-top:8px}
.sprint-tip{grid-column:1/-1;border-radius:18px;padding:20px;background:#fff7e8;border:1px solid #f1dfb9}
.sprint-tip strong{display:block;color:#8b5b00;font-size:13px}
.sprint-tip p{font-size:11px;line-height:1.6;color:#8f7442;margin:7px 0 0}

.finish-block{padding:45px}
.finish-block>p{font-size:13px;line-height:1.7}
.finish-stats div{min-width:140px;padding:16px}
.finish-stats strong{font-size:22px}

@media(max-width:900px){
 .warmup-grid,.examples-grid,.lab-panel,.sprint-wrap{grid-template-columns:1fr}
 .sprint-stats{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
 .lesson-block{padding:20px}
 .theory-card.rich{grid-template-columns:1fr}
 .theory-card.rich p{font-size:15px}
 .examples-grid{grid-template-columns:1fr}
 .input-task,.sprint-input-row{grid-template-columns:1fr}
 .input-task .btn,.sprint-input-row .btn{width:100%}
 .answers-grid{grid-template-columns:1fr}
 .sprint-stats{grid-template-columns:1fr}
 .sprint-tip{grid-column:auto}
 .paint-cell{height:48px}
}


/* V5 additions */
.life-block{overflow:hidden;position:relative}
.life-block:before{content:"";position:absolute;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(65,102,255,.10),transparent 70%);right:-110px;top:-120px;pointer-events:none}
.life-grid{display:grid;grid-template-columns:180px 1fr;gap:28px;align-items:center;position:relative}
.life-visual{height:180px;border-radius:28px;background:linear-gradient(135deg,#10204a,#425fd2);display:grid;place-items:center;box-shadow:0 20px 45px rgba(20,40,100,.18)}
.life-visual span{font-size:70px}
.life-kicker{font-size:10px;text-transform:uppercase;letter-spacing:.1em;font-weight:800;color:var(--blue)}
.life-copy h2{font-size:30px;color:var(--ink);margin:7px 0 10px}
.life-copy>p{font-size:15px;line-height:1.75;color:var(--muted);margin:0 0 18px}
.life-question{padding:14px 16px;background:#f4f7ff;border:1px solid #e0e7fb;border-radius:14px;color:var(--ink);font-size:14px;font-weight:800;margin-bottom:12px}
.life-answer-row{display:grid;grid-template-columns:1fr auto;gap:10px}
.life-answer-row input{border:2px solid #dfe5f0;border-radius:14px;padding:14px 15px;font-size:16px;outline:none}
.life-answer-row input:focus{border-color:#8fa7ff}
.life-feedback{font-size:12px;line-height:1.6;min-height:20px;margin-top:10px;border-radius:12px}
.life-feedback.good{padding:11px 13px;background:#edf9f4;color:#08734b}
.life-feedback.bad{padding:11px 13px;background:#fff3ef;color:#9f442b}
.quiz-tag{letter-spacing:.04em}
@media(max-width:700px){
 .life-grid{grid-template-columns:1fr}
 .life-visual{height:110px}
 .life-visual span{font-size:50px}
 .life-answer-row{grid-template-columns:1fr}
}



/* V6 universal mathematics architecture */
mjx-container{font-size:1.08em!important;max-width:100%;overflow-x:auto;overflow-y:hidden}
.formula mjx-container{font-size:1.22em!important}
.worked-example mjx-container,.quiz-card mjx-container,.life-block mjx-container{vertical-align:middle}
.graphs-grid{display:grid;gap:18px}
.graph-card{border:1px solid var(--line);border-radius:22px;padding:20px;background:#fff;display:grid;grid-template-columns:280px 1fr;gap:20px;align-items:center}
.graph-card h3{font-size:21px;color:var(--ink);margin:6px 0}
.graph-card p{font-size:12px;line-height:1.65;color:var(--muted)}
.graph-board{width:100%;min-height:360px;border-radius:16px;overflow:hidden;background:#fff}
math-field{display:block;width:100%;min-height:58px;border:2px solid #dfe5f0;border-radius:14px;padding:10px 12px;font-size:21px;background:#fff}
math-field:focus-within{border-color:#8fa7ff;outline:none}
.math-system-card{border:1px solid var(--line);background:#fff;border-radius:20px;padding:22px}
@media(max-width:800px){.graph-card{grid-template-columns:1fr}.graph-board{min-height:300px}}


/* V6.1 — enlarged educational text for children */

/* Grade 5 course map / content */
.grade-hero p{
  font-size:18px;
  line-height:1.8;
}
.world-summary__item strong{
  font-size:15px;
  line-height:1.45;
}
.world-summary__item small{
  font-size:12px;
  line-height:1.65;
}
.world-block__head p{
  font-size:13px;
  line-height:1.6;
}
.mission-info strong{
  font-size:15px;
  line-height:1.45;
}
.mission-info small{
  font-size:12.5px;
  line-height:1.6;
  margin-top:6px;
}
.start-banner p{
  font-size:14px;
  line-height:1.7;
}
.badge-card p{
  font-size:12px;
  line-height:1.6;
}

/* Lesson introductory text */
.lesson-hero p{
  font-size:20px;
  line-height:1.85;
}
.lesson-meta{
  font-size:12px;
  line-height:1.5;
}
.lesson-objective>span{
  font-size:12px;
}
.lesson-objective li{
  font-size:17px;
  line-height:1.7;
  margin:12px 0;
}

/* Explanatory content */
.lesson-block .section-lead{
  font-size:18px;
  line-height:1.8;
}
.warmup-card p{
  font-size:17px;
  line-height:1.65;
}
.warmup-card small{
  font-size:12px;
  line-height:1.5;
}
.theory-card.rich h3{
  font-size:24px;
  line-height:1.35;
}
.theory-card.rich p{
  font-size:19px;
  line-height:1.85;
}
.theory-card.rich .formula{
  font-size:24px;
  line-height:1.55;
  padding:18px 20px;
}

/* Worked examples */
.worked-head h3{
  font-size:22px;
  line-height:1.4;
}
.worked-example li{
  font-size:17px;
  line-height:1.75;
  margin:10px 0;
}
.worked-answer span{
  font-size:12px;
}
.worked-answer strong{
  font-size:19px;
  line-height:1.45;
}

/* Laboratory / explanation cards */
.lab-card p{
  font-size:16px;
  line-height:1.75;
}
.lab-card li{
  font-size:15px;
  line-height:1.75;
}

/* Main practice */
.practice-title p{
  font-size:16px;
  line-height:1.7;
}
.quiz-tag{
  font-size:11px;
}
.quiz-card h3{
  font-size:27px;
  line-height:1.5;
}
.answer-btn{
  font-size:17px;
  line-height:1.55;
  padding:17px 18px;
}
.feedback{
  font-size:16px;
  line-height:1.75;
}
.input-task input{
  font-size:19px;
  line-height:1.4;
}
.classify-object{
  font-size:31px;
  line-height:1.45;
}
.order-chip{
  font-size:16px;
}
.order-picked b{
  font-size:14px;
}
.paint-counter{
  font-size:15px;
}

/* Real-life mission */
.life-copy>p{
  font-size:18px;
  line-height:1.8;
}
.life-question{
  font-size:17px;
  line-height:1.65;
}
.life-answer-row input{
  font-size:18px;
}
.life-feedback{
  font-size:15px;
  line-height:1.7;
}

/* Sprint */
.sprint-game h3{
  font-size:31px;
  line-height:1.4;
}
.sprint-feedback{
  font-size:15px;
  line-height:1.65;
}
.sprint-tip p{
  font-size:14px;
  line-height:1.7;
}

/* Finish */
.finish-block>p{
  font-size:16px;
  line-height:1.75;
}
.finish-stats span{
  font-size:12px;
  line-height:1.5;
}

/* Math readability */
mjx-container{
  font-size:1.15em!important;
}
.formula mjx-container{
  font-size:1.28em!important;
}

@media(max-width:640px){
  .grade-hero p{font-size:17px}
  .mission-info strong{font-size:14.5px}
  .mission-info small{font-size:12px}
  .lesson-hero p{font-size:18px}
  .lesson-objective li{font-size:16px}
  .lesson-block .section-lead{font-size:17px}
  .warmup-card p{font-size:16px}
  .theory-card.rich h3{font-size:22px}
  .theory-card.rich p{font-size:18px}
  .theory-card.rich .formula{font-size:22px}
  .worked-example li{font-size:16px}
  .practice-title p{font-size:15px}
  .quiz-card h3{font-size:24px}
  .answer-btn{font-size:16px}
  .feedback{font-size:15px}
  .life-copy>p{font-size:17px}
  .life-question{font-size:16px}
}


/* V6.3 — Visual Geometry Laboratory */
.geo-card{
  border:1px solid #dfe5f1;
  border-radius:26px;
  background:#fff;
  padding:24px;
  box-shadow:0 10px 30px rgba(25,40,85,.06);
  overflow:hidden;
}
.geo-card+.geo-card{margin-top:18px}
.geo-card__head{display:flex;gap:16px;align-items:flex-start;margin-bottom:18px}
.geo-card__icon{
  width:54px;height:54px;border-radius:17px;
  background:linear-gradient(135deg,#edf2ff,#f5edff);
  display:grid;place-items:center;font-size:28px;flex:0 0 auto
}
.geo-card__head h3{margin:0 0 6px;font-size:24px;line-height:1.35;color:#17244a}
.geo-card__head p{margin:0;font-size:16px;line-height:1.7;color:#6c7891}
.geo-card__body{display:grid;gap:16px}
.geo-svg{
  width:100%;height:auto;min-height:250px;
  background:linear-gradient(180deg,#fbfcff,#f6f8fd);
  border:1px solid #e5e9f3;border-radius:20px;
  touch-action:none
}
.geo-controls{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  padding:12px 14px;border-radius:16px;background:#f6f8fd;
  color:#42506d;font-size:14px;font-weight:700
}
.geo-range{accent-color:#4568e8;min-width:120px}
.geo-btn{
  border:0;border-radius:12px;padding:11px 14px;
  background:#2747b5;color:#fff;font-weight:800;font-size:13px;cursor:pointer
}
.geo-btn.secondary{background:#e9eefb;color:#263c82}
.geo-badge{
  display:inline-flex;align-items:center;min-height:36px;
  padding:8px 12px;border-radius:999px;background:#fff;
  border:1px solid #dce3f2;color:#19316e;font-size:13px;font-weight:800
}
.geo-line,.geo-axis,.geo-angle-ray,.polygon-edge,.solid-edge{
  stroke:#223d8b;stroke-width:4;stroke-linecap:round;fill:none
}
.geo-line.strong{stroke-width:6}
.geo-axis{stroke:#44516b;stroke-width:3}
.geo-arrow-fill{fill:#44516b}
.geo-point,.solid-vertex{fill:#ffb648;stroke:#fff;stroke-width:3}
.geo-point.selected{fill:#486ee8}
.geo-label{font:800 20px Manrope,sans-serif;fill:#17244a}
.geo-measure{font:800 17px Manrope,sans-serif;fill:#53617a}
.geo-tick{stroke:#69758e;stroke-width:2}
.geo-tick-label{font:700 14px Manrope,sans-serif;fill:#53617a}
.geo-hit{fill:transparent;cursor:pointer}
.geo-caption,.geo-mini-feedback{
  border-radius:14px;padding:12px 14px;
  font-size:15px;line-height:1.6;background:#f4f7ff;color:#42506d
}
.geo-mini-feedback.good{background:#eaf8f1;color:#08734b}
.geo-mini-feedback.bad{background:#fff2ed;color:#9c462d}
.geo-tabbar{display:flex;gap:8px;flex-wrap:wrap}
.geo-tab{
  border:1px solid #d7deed;background:#fff;color:#42506d;
  border-radius:999px;padding:10px 14px;font-size:13px;font-weight:800;cursor:pointer
}
.geo-tab.active{background:#233f98;border-color:#233f98;color:#fff}

/* Protractor */
.protractor-body{
  fill:rgba(78,111,224,.08);stroke:#8497d8;stroke-width:2
}
.protractor-base{stroke:#42506d;stroke-width:3}
.protractor-tick{stroke:#8090b4;stroke-width:1.2}
.protractor-tick.major{stroke:#53668f;stroke-width:2}
.protractor-number{font:700 12px Manrope,sans-serif;fill:#53617a}
.geo-angle-ray{stroke:#1f347f;stroke-width:6}
.geo-angle-ray.moving{stroke:#ef7f4d}
.geo-angle-arc{fill:none;stroke:#e76531;stroke-width:5;stroke-linecap:round}
.geo-angle-value{font:800 22px Manrope,sans-serif;fill:#c64d23}
.protractor-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}
.protractor-step{
  padding:12px;border-radius:14px;border:1px solid #e1e6f1;
  background:#fff;color:#6a7690;font-size:13px;line-height:1.55
}
.protractor-step.active{
  background:#fff6e8;border-color:#f1c77e;color:#7f560b;
  box-shadow:0 7px 18px rgba(175,116,24,.12)
}
.tutorial-ring{fill:rgba(255,178,67,.14);stroke:#f2a62d;stroke-width:4}
.tutorial-highlight{stroke:#f2a62d;stroke-width:11;stroke-linecap:round}
.tutorial-text{font:800 17px Manrope,sans-serif;fill:#a35d08}

/* Polygons and triangles */
.geo-shape{fill:rgba(76,111,224,.09);stroke:#2e4ba5;stroke-width:3}
.polygon-edge{transition:.25s}
.polygon-edge.highlight{stroke:#f08b36;stroke-width:8}
.triangle-main{fill:rgba(90,127,229,.10)}
.geo-point.draggable{fill:#ef7f4d;cursor:grab}
.geo-angle-label{font:800 16px Manrope,sans-serif;fill:#925119}
.geo-result-row{display:flex;gap:10px;flex-wrap:wrap}

/* Area */
.area-grid{
  display:grid;gap:3px;justify-content:center;align-content:center;
  padding:20px;min-height:230px;border:1px solid #e4e9f3;border-radius:20px;
  background:#fafbfe;overflow:auto
}
.area-cell{
  width:42px;height:42px;border:1px solid #9db0e8;border-radius:5px;
  background:linear-gradient(135deg,#dce6ff,#eef3ff);
  display:grid;place-items:center;font-size:9px;color:#6172a1;
  animation:geoPop .25s ease both
}
@keyframes geoPop{from{opacity:.15;transform:scale(.75)}to{opacity:1;transform:scale(1)}}

/* Solids */
.solid-face{fill:rgba(98,127,210,.06);stroke:none;transition:.2s}
.solid-face.active{fill:rgba(72,108,224,.20)}
.solid-edge{stroke:#4b5f97;stroke-width:3;transition:.2s}
.solid-edge.active{stroke:#ef7f4d;stroke-width:7}
.solid-vertex{fill:#6f82b8;transition:.2s}
.solid-vertex.active{fill:#ef7f4d;stroke:#fff;stroke-width:3}
.geo-big-note{font:800 24px Manrope,sans-serif;fill:#213875}
.cube-top{fill:#dce6ff;stroke:#8ca2df;stroke-width:1}
.cube-side-a{fill:#bccbf4;stroke:#8098db;stroke-width:1}
.cube-side-b{fill:#aabce9;stroke:#758ed1;stroke-width:1}

/* Final recap */
.geo-summary-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.geo-summary-card{
  padding:18px;border:1px solid #e0e6f2;border-radius:18px;background:#f9faff
}
.geo-summary-card>b{font-size:30px}
.geo-summary-card h4{font-size:17px;margin:10px 0 3px;color:#17244a}
.geo-summary-card strong{font-size:14px;color:#3154b5}
.geo-summary-card p{font-size:12px;line-height:1.55;color:#707c92;margin:8px 0 0}

@media(max-width:800px){
  .protractor-steps{grid-template-columns:1fr 1fr}
  .geo-summary-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  .geo-card{padding:16px}
  .geo-card__head h3{font-size:21px}
  .geo-card__head p{font-size:15px}
  .geo-controls{align-items:stretch}
  .geo-range{width:100%;min-width:100%}
  .protractor-steps{grid-template-columns:1fr}
  .geo-summary-grid{grid-template-columns:1fr}
  .geo-svg{min-height:210px}
}


.protractor-practice{
  display:grid;grid-template-columns:minmax(180px,1fr) minmax(130px,220px) auto;
  gap:10px;align-items:center;padding:14px;border-radius:16px;
  background:#f7f9ff;border:1px solid #e1e7f4
}
.protractor-practice>div{display:grid;gap:3px}
.protractor-practice strong{font-size:15px;color:#17244a}
.protractor-practice span{font-size:12px;color:#6d7890}
.geo-answer-input{
  border:2px solid #dce3f1;border-radius:12px;padding:12px 13px;
  font-size:17px;outline:none;background:#fff
}
.geo-answer-input:focus{border-color:#7892e8}
@media(max-width:700px){
  .protractor-practice{grid-template-columns:1fr}
}


/* V6.5 — story learning & richer explanations */
.story-guide__avatar{position:relative;animation:heroFloat 3.1s ease-in-out infinite;box-shadow:0 14px 35px rgba(31,57,130,.12)}
.story-guide__avatar:after{content:"✦";position:absolute;right:-8px;top:-10px;font-size:20px;animation:starOrbit 2.4s ease-in-out infinite}
@keyframes heroFloat{0%,100%{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-8px) rotate(2deg)}}
@keyframes starOrbit{0%,100%{transform:scale(.8) rotate(0);opacity:.45}50%{transform:scale(1.2) rotate(20deg);opacity:1}}
.kid-explain{display:grid;grid-template-columns:1.15fr 1fr;gap:14px;margin:0 0 18px}.kid-guide-card{border-radius:22px;padding:22px;border:1px solid #e2e7f1;background:linear-gradient(135deg,#f8fbff,#fffaf0)}.kid-guide-card.main{grid-row:span 2}.kid-guide-card span{font-size:10px;letter-spacing:.09em;text-transform:uppercase;font-weight:800;color:var(--blue)}.kid-guide-card h3{font-size:22px;line-height:1.35;color:var(--ink);margin:8px 0}.kid-guide-card p,.kid-guide-card li{font-size:17px;line-height:1.8;color:#586780}.kid-guide-card ol{padding-left:22px;margin:12px 0 0}.kid-guide-card.warning{background:#fff7ed;border-color:#f0dcc0}.kid-guide-card.check{background:#f1f8ff}.kid-check-row{display:grid;grid-template-columns:1fr auto;gap:9px;margin-top:12px}.kid-check-row input{border:2px solid #dce4f2;border-radius:13px;padding:13px 14px;font-size:17px;outline:none;background:#fff}.kid-check-row input:focus{border-color:#7792e7}.kid-check-feedback{min-height:22px;margin-top:10px;font-size:14px;font-weight:700}.kid-check-feedback.good{color:#08734b}.kid-check-feedback.bad{color:#9e4b31}.more-examples-head{margin:24px 0 12px;padding-top:18px;border-top:1px dashed #dce3ef;display:flex;justify-content:space-between;gap:15px;align-items:center}.more-examples-head span{font-size:18px;color:var(--ink);font-weight:800}.more-examples-head strong{font-size:12px;color:var(--muted)}.extra-examples{grid-template-columns:repeat(3,1fr)}.micro-example{display:flex;flex-direction:column}.micro-example h4{font-size:17px}.micro-example p,.micro-example li{font-size:15px}.micro-example .btn{align-self:flex-start}.hero-task-callout{display:grid;grid-template-columns:48px 1fr;gap:12px;align-items:center;background:linear-gradient(135deg,#eef3ff,#fff8e8);border:1px solid #dfe6f3;border-radius:18px;padding:13px 15px;margin-bottom:18px}.hero-task-callout .avatar{font-size:30px;animation:heroFloat 3s ease-in-out infinite}.hero-task-callout b{display:block;color:var(--ink);font-size:14px}.hero-task-callout p{margin:3px 0 0;color:#65728a;font-size:13px;line-height:1.6}.math-answer-preview{margin-top:9px;min-height:44px;border-radius:12px;background:#fff;border:1px dashed #cbd5e8;padding:8px 12px;display:flex;align-items:center;font-size:18px}.math-answer-preview.hidden{display:none}.fraction-tip{font-size:11px;color:#6d7890;margin-top:6px}.story-progress-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.story-chapter{border:1px solid var(--line);border-radius:24px;background:#fff;padding:19px;position:relative;overflow:hidden}.story-chapter:before{content:"";position:absolute;width:100px;height:100px;border-radius:50%;right:-35px;top:-35px;background:rgba(75,108,224,.08)}.story-chapter__hero{font-size:34px;animation:heroFloat 3.4s ease-in-out infinite}.story-chapter small{display:block;font-size:9px;letter-spacing:.08em;text-transform:uppercase;font-weight:800;color:var(--blue);margin-top:8px}.story-chapter h3{font-size:18px;color:var(--ink);margin:5px 0 7px}.story-chapter p{font-size:12px;line-height:1.65;color:var(--muted);min-height:58px}.story-chapter__bar{height:7px;background:#edf0f6;border-radius:99px;overflow:hidden;margin-top:13px}.story-chapter__bar i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--violet));border-radius:99px}.story-chapter__stat{display:flex;justify-content:space-between;margin-top:7px;font-size:10px;color:#6d7890}.story-chapter.completed{border-color:#a8ddc8;background:#fbfffd}.story-chapter.completed:after{content:"✓ Кристал відновлено";display:inline-flex;margin-top:10px;padding:6px 9px;border-radius:999px;background:#e7f8f0;color:#08734b;font-size:9px;font-weight:800}
@media(max-width:980px){.kid-explain{grid-template-columns:1fr}.kid-guide-card.main{grid-row:auto}.extra-examples,.story-progress-strip{grid-template-columns:1fr 1fr}}@media(max-width:640px){.kid-guide-card p,.kid-guide-card li{font-size:16px}.kid-check-row{grid-template-columns:1fr}.extra-examples,.story-progress-strip{grid-template-columns:1fr}.more-examples-head{display:block}.more-examples-head strong{display:block;margin-top:5px}}

/* V7 Grade 6 interactive laboratories */
.g6-lab-card{background:#fff;border:1px solid #e0e6f1;border-radius:24px;padding:22px;box-shadow:0 10px 28px rgba(30,48,90,.05)}.g6-lab-head{display:flex;gap:14px;align-items:flex-start}.g6-lab-head>span{width:50px;height:50px;border-radius:16px;background:#eef2ff;display:grid;place-items:center;font-size:25px}.g6-lab-head small{font-size:10px;text-transform:uppercase;letter-spacing:.08em;font-weight:800;color:#526bca}.g6-lab-head h3{font-size:23px;margin:4px 0 5px;color:#17244a}.g6-lab-head p{font-size:15px;line-height:1.7;color:#69768e;margin:0}.g6-lab-body{display:grid;gap:16px;margin-top:18px}.g6-controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap;background:#f7f9fd;border-radius:15px;padding:12px 14px;font-size:13px;font-weight:800;color:#586680}.g6-range{accent-color:#526fe5;min-width:130px}.g6-live-badge{display:inline-flex;padding:8px 12px;border-radius:999px;background:#fff;border:1px solid #dce3f0;color:#233f9a;font-size:14px}.g6-lab-btn{border:0;border-radius:12px;padding:11px 14px;background:#2947aa;color:#fff;font-weight:800;cursor:pointer}.g6-lab-note{font-size:15px!important;line-height:1.7!important;color:#5f6d86!important;margin:0!important}.g6-percent-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:4px;max-width:560px}.g6-percent-grid i{aspect-ratio:1;border-radius:4px;background:#edf0f6}.g6-percent-grid i.on{background:#5c78e6}.g6-frac{display:inline-grid;vertical-align:middle;grid-template-rows:auto 2px auto;min-width:28px;text-align:center;line-height:1.05;margin:0 3px}.g6-frac i{background:currentColor}.g6-frac-strip{display:grid;gap:3px;height:70px;max-width:650px}.g6-frac-strip i{border:1px solid #a9b8df;background:#f2f5fc;border-radius:5px}.g6-frac-strip i.on{background:#6680e8}.g6-area-grid{display:grid;gap:3px;justify-content:start}.g6-area-grid i{width:38px;height:38px;border-radius:4px;background:#f3f5fa;border:1px solid #dce2ef}.g6-area-grid i.row{background:#dce6ff}.g6-area-grid i.col{background:#fff0ce}.g6-area-grid i.both{background:#8bd6c9}.g6-flip-row{display:flex;align-items:center;justify-content:center;gap:24px;min-height:120px}.g6-big-math{font-size:30px;color:#1c357f}.g6-ratio-bars{display:grid;gap:10px}.g6-ratio-bars div{height:34px;border-radius:8px;min-width:20px;transition:.25s}.g6-ratio-bars .a{background:#5d78e6}.g6-ratio-bars .b{background:#efb55c}.g6-select{padding:9px;border:1px solid #d8e0ef;border-radius:10px;background:#fff}.g6-circle-wrap{min-height:280px;display:grid;place-items:center}.g6-circle{border-radius:50%;background:rgba(87,112,222,.16);border:4px solid #5570d8;transition:.2s}.g6-pie{width:230px;height:230px;border-radius:50%;margin:auto;border:1px solid #dce2ee}.g6-numberline{position:relative;height:90px;margin:18px 15px 5px;border-top:3px solid #596783}.g6-numberline>i{position:relative;display:inline-block;width:calc(100% / 21);height:18px;border-left:1px solid #8994aa;top:-3px}.g6-numberline i span{position:absolute;top:22px;left:-8px;font-size:9px;color:#68758e}.g6-number-dot{position:absolute;top:-12px;width:20px;height:20px;border-radius:50%;background:#ed8a43;transform:translateX(-50%);transition:.15s}.g6-sign-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.g6-sign-card{padding:18px;background:#f7f9fd;border-radius:14px;font-size:22px;font-weight:800;text-align:center;color:#273c82}.g6-scales{display:grid;grid-template-columns:1fr 1fr;gap:16px}.g6-scales div{padding:24px;border:3px solid #dbe1ef;border-radius:16px;text-align:center;font-size:20px;font-weight:800}.g6-scales.balanced div{border-color:#78c7ad;background:#eef9f5}.g6-lines{height:240px;position:relative;background:#f8f9fc;border-radius:16px;overflow:hidden}.g6-lines i{position:absolute;width:70%;height:5px;background:#465dba;left:15%;top:35%;transform-origin:center}.g6-lines i+ i{top:65%}.g6-lines.perpendicular i:first-child{top:50%}.g6-lines.perpendicular i+ i{top:50%;transform:rotate(90deg)}.g6-coord-plane{height:350px;position:relative;border-radius:16px;background-image:linear-gradient(#e7ebf4 1px,transparent 1px),linear-gradient(90deg,#e7ebf4 1px,transparent 1px);background-size:5% 10%;border:1px solid #dde3ef;cursor:crosshair}.g6-coord-plane i.x{position:absolute;left:0;right:0;top:50%;height:2px;background:#55627f}.g6-coord-plane i.y{position:absolute;top:0;bottom:0;left:50%;width:2px;background:#55627f}.g6-coord-plane b{position:absolute;width:16px;height:16px;border-radius:50%;background:#ef8542;transform:translate(-50%,-50%);left:50%;top:50%}.g6-canvas{width:100%;height:auto;border:1px solid #dce3ef;border-radius:16px;background:#fff}.g6-net{display:grid;grid-template-columns:repeat(4,64px);grid-template-rows:repeat(3,64px);justify-content:center}.g6-net i{width:62px;height:62px;border:2px solid #6377bd;background:#edf2ff;display:grid;place-items:center;font-weight:800;grid-row:2}.g6-net i.top{grid-row:1;grid-column:2}.g6-net i.bottom{grid-row:3;grid-column:2}.g6-net i.on{background:#f3bf67}.g6-cubes{display:flex;flex-wrap:wrap;gap:3px;max-width:450px}.g6-cubes i{width:25px;height:25px;background:linear-gradient(135deg,#dce7ff,#9fb5ec);border:1px solid #7892d2}.g6-review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.g6-review-grid .g6-lab-btn{background:#eef2ff;color:#344b9d}.g6-review-grid .g6-lab-btn.done{background:#e8f8f1;color:#14704f}@media(max-width:640px){.g6-sign-grid,.g6-review-grid{grid-template-columns:1fr}.g6-controls{align-items:stretch}.g6-range{width:100%}.g6-pie{width:180px;height:180px}.g6-coord-plane{height:280px}.g6-net{transform:scale(.78);transform-origin:center}}


/* V8.1 — Algebra Step Solver: no typing variables/powers on mobile */
.algebra-algorithm{
  display:grid;gap:14px;border:1px solid #dce4f4;border-radius:22px;
  padding:18px;background:linear-gradient(145deg,#fbfcff,#f4f7ff)
}
.algo-head{display:grid;gap:5px}
.algo-kicker{
  width:max-content;padding:5px 8px;border-radius:999px;background:#17295e;color:#fff;
  font-size:9px;font-weight:900;letter-spacing:.12em
}
.algo-head h4{margin:0;font-size:20px;line-height:1.35;color:#17244a}
.algo-head p{margin:0;font-size:14px;line-height:1.65;color:#68758f}
.algo-trail{display:grid;gap:8px}
.algo-trail-item{
  display:grid;grid-template-columns:74px 1fr;gap:10px;align-items:center;
  padding:11px 13px;border:1px solid #e1e6f1;background:#fff;border-radius:14px
}
.algo-trail-item span{font-size:9px;font-weight:900;letter-spacing:.08em;color:#7180a1}
.algo-trail-item strong{font-size:15px;line-height:1.55;color:#26365f;font-weight:800}
.algo-trail-item.current{border-color:#b9c8f5;background:#f7f9ff}
.algo-stage{
  border-top:1px dashed #d6deee;padding-top:15px;display:grid;gap:12px
}
.algo-stage-head span{font-size:9px;font-weight:900;letter-spacing:.1em;color:#506cc8}
.algo-stage-head h5{font-size:19px;color:#17244a;margin:5px 0}
.algo-stage-head p{font-size:13px;line-height:1.6;color:#6c7890;margin:0}
.algo-options{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.algo-option{
  min-height:58px;padding:13px 15px;border-radius:14px;border:1px solid #dce3f0;
  background:#fff;color:#34415e;font-size:14px;font-weight:750;line-height:1.5;
  text-align:left;cursor:pointer;transition:.15s
}
.algo-option:hover{border-color:#95a9e7;transform:translateY(-1px)}
.algo-option.correct{background:#ebf8f1;border-color:#7dceb0;color:#08734b}
.algo-option.wrong{background:#fff2ee;border-color:#efaa97;color:#9b4329}
.algo-option:disabled{cursor:default;transform:none}
.algo-local-feedback{min-height:22px;font-size:13px;line-height:1.6}
.algo-local-feedback.good{color:#08734b}
.algo-local-feedback.bad{color:#a14b30}

.formula-choice-grid{
  display:grid!important;grid-template-columns:1fr 1fr!important;gap:9px!important;
  width:100%
}
.formula-choice-grid .algo-option{
  min-height:64px;display:flex;align-items:center;justify-content:center;
  text-align:center;font-size:17px;background:#fff
}
.mentor-formula-choice,.life-formula-choice,.sprint-formula-choice{width:100%}
.life-answer-row:has(.life-formula-choice),
.sprint-answer-row:has(.sprint-formula-choice){display:block}
.sprint-formula-choice .algo-option{
  background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.25);color:#fff
}
.sprint-formula-choice .algo-option.correct{background:#daf8e9;color:#075d3e;border-color:#87dab8}
.sprint-formula-choice .algo-option.wrong{background:#ffe7de;color:#8d351f;border-color:#f2ad95}

.algo-option mjx-container{font-size:1.12em!important}
@media(max-width:680px){
  .algo-options,.formula-choice-grid{grid-template-columns:1fr!important}
  .algebra-algorithm{padding:14px}
  .algo-head h4{font-size:18px}
  .algo-option{font-size:14px;min-height:54px}
  .formula-choice-grid .algo-option{font-size:16px}
  .algo-trail-item{grid-template-columns:62px 1fr}
}


/* V8.2 — Grade 7 course architecture layout fix */

/* Do not stack two full 88px section paddings between these blocks. */
.grade-intro{
  padding-top:72px;
  padding-bottom:34px;
}
.story-arc-section{
  padding-top:34px;
  padding-bottom:72px;
}

/* Balanced 4 + 3 architecture layout on desktop. */
.world-summary.a7-summary{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:14px;
  align-items:stretch;
}
.world-summary.a7-summary .world-summary__item{
  grid-column:span 3;
  min-height:156px;
  padding:22px 20px;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  justify-content:flex-start;
}
.world-summary.a7-summary .world-summary__item:nth-child(5){
  grid-column:2 / span 3;
}
.world-summary.a7-summary .world-summary__item:nth-child(6),
.world-summary.a7-summary .world-summary__item:nth-child(7){
  grid-column:span 3;
}
.world-summary.a7-summary .world-summary__item strong{
  font-size:16px;
  line-height:1.4;
  margin-top:23px;
}
.world-summary.a7-summary .world-summary__item small{
  font-size:12px;
  line-height:1.55;
  margin-top:7px;
}
.world-summary.a7-summary .world-summary__item i{
  min-height:22px;
  display:inline-flex;
  align-items:center;
}

/* Keep the transition visually connected. */
.grade-intro + .story-arc-section{
  border-top:1px solid rgba(221,227,239,.72);
}

/* Story heading should not look detached from architecture. */
.story-arc-section .section-title{
  margin-bottom:28px;
}

@media(max-width:1100px){
  .world-summary.a7-summary{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
  .world-summary.a7-summary .world-summary__item,
  .world-summary.a7-summary .world-summary__item:nth-child(5),
  .world-summary.a7-summary .world-summary__item:nth-child(6),
  .world-summary.a7-summary .world-summary__item:nth-child(7){
    grid-column:auto;
  }
  .grade-intro{padding-bottom:28px}
  .story-arc-section{padding-top:28px}
}
@media(max-width:640px){
  .world-summary.a7-summary{
    grid-template-columns:1fr;
  }
  .grade-intro{padding-top:54px;padding-bottom:24px}
  .story-arc-section{padding-top:24px;padding-bottom:54px}
}

/* V9 — 7 клас Геометрія: інтерактивні рисунки і доведення */
.g7g-card{border:1px solid #dfe5f1;border-radius:24px;background:#fff;padding:22px;box-shadow:0 10px 28px rgba(21,38,86,.06);overflow:hidden}.g7g-head{display:flex;gap:15px;align-items:flex-start;margin-bottom:16px}.g7g-icon{width:52px;height:52px;display:grid;place-items:center;border-radius:16px;background:linear-gradient(135deg,#edf3ff,#f1edff);font-size:26px;flex:0 0 auto}.g7g-head span{font-size:9px;font-weight:900;letter-spacing:.1em;color:#5871c5}.g7g-head h3{font-size:23px;color:#17244a;margin:5px 0}.g7g-head p{font-size:15px;line-height:1.7;color:#67748e;margin:0}.g7g-body{display:grid;gap:13px}.g7g-svg{width:100%;height:auto;min-height:290px;border:1px solid #e4e9f3;border-radius:19px;background:linear-gradient(180deg,#fcfdff,#f6f8fd);touch-action:none}.g7g-controls{display:flex;align-items:center;gap:9px;flex-wrap:wrap;padding:11px 13px;border-radius:15px;background:#f6f8fd;color:#4d5c78;font-size:13px;font-weight:800}.g7g-btn{border:0;border-radius:11px;background:#2648af;color:#fff;padding:10px 13px;font-size:12px;font-weight:850;cursor:pointer}.g7g-btn:hover,.g7g-btn.active{filter:brightness(1.08);transform:translateY(-1px)}.g7g-range{accent-color:#4569d5;min-width:150px}.g7g-badge{display:inline-flex;align-items:center;min-height:34px;padding:7px 11px;border-radius:999px;background:#fff;border:1px solid #dbe3f2;color:#223f91;font-size:12px;font-weight:850}.g7g-line,.g7g-ray,.g7g-transversal,.g7g-tangent,.g7g-perp,.g7g-slant,.g7g-highlight,.g7g-bisector,.g7g-hitline,.g7g-inscribed{stroke:#263e82;stroke-width:4;fill:none;stroke-linecap:round}.g7g-line.strong{stroke-width:6}.g7g-line.accent,.g7g-ray.accent,.g7g-highlight,.g7g-bisector{stroke:#ef7f4d;stroke-width:6}.g7g-line.bad{stroke:#c75d45;stroke-width:5}.g7g-perp{stroke:#3a67c7;stroke-width:5}.g7g-slant{stroke:#a7b0c8;stroke-width:3}.g7g-transversal{stroke:#7654b6;stroke-width:5}.g7g-tangent{stroke:#e07642}.g7g-hitline{stroke:transparent;stroke-width:24;cursor:pointer}.g7g-inscribed{stroke:#7854b5}.g7g-shape{fill:rgba(71,105,203,.08);stroke:#3150a5;stroke-width:3}.g7g-circle{fill:none;stroke:#3658ac;stroke-width:3}.g7g-circle.accent{stroke:#ef7f4d;stroke-width:4}.g7g-construction{fill:none;stroke:#9aa9ce;stroke-width:2;stroke-dasharray:7 6}.g7g-protractor{fill:rgba(78,111,224,.07);stroke:#8999c7;stroke-width:2}.g7g-tick{stroke:#8f9bbc;stroke-width:1.3}.g7g-dot{fill:#ffb64a;stroke:#fff;stroke-width:3}.g7g-dot.accent{fill:#e86e40}.g7g-label,.g7g-text,.g7g-measure,.g7g-angle-label,.g7g-note-text{font-family:Manrope,sans-serif;fill:#26365d}.g7g-label{font-size:19px;font-weight:800}.g7g-angle-label{font-size:16px;font-weight:850;fill:#a35326}.g7g-angle-arc{fill:none;stroke:#e7743f;stroke-width:4}.g7g-mark{stroke:#304f9e;stroke-width:3;fill:none}.g7g-node{fill:#fff;stroke:#cfd8ec;stroke-width:2}.g7g-node-text{font-family:Manrope,sans-serif;font-size:13px;font-weight:900;fill:#23396f}.g7g-flow{stroke:#607ac4;stroke-width:3}.g7g-flow-label{font-size:18px;fill:#607ac4}.g7g-arrow{font-size:24px;fill:#405274}.g7g-check-steps{display:grid;grid-template-columns:repeat(5,1fr);gap:9px}.g7g-check-steps .g7g-btn{min-height:72px;text-align:left;background:#f2f5fc;color:#33456f;border:1px solid #dce3f1}.g7g-check-steps .g7g-btn.active{background:#e9f7f1;color:#08734b;border-color:#9bd8c0}
.proof-panel{display:grid;grid-template-columns:210px 1fr;gap:18px}.proof-summary{border-radius:20px;background:#132451;color:#fff;padding:20px}.proof-summary span{font-size:9px;letter-spacing:.1em;color:#aebbe2;font-weight:850}.proof-summary h3{font-size:20px;margin:9px 0 16px}.proof-summary dl{display:grid;gap:12px;margin:0}.proof-summary dt{font-size:9px;text-transform:uppercase;letter-spacing:.08em;color:#8fa2d6}.proof-summary dd{margin:3px 0 0;font-size:13px;line-height:1.55}.proof-steps{display:grid;gap:9px}.proof-step{border:1px solid #e0e5ef;border-radius:16px;padding:14px 16px;background:#fbfcff;display:grid;grid-template-columns:32px 1fr;gap:10px;align-items:start}.proof-step span{width:30px;height:30px;border-radius:9px;background:#eef2ff;color:#3251a7;display:grid;place-items:center;font-size:11px;font-weight:900}.proof-step p{margin:2px 0;font-size:15px;line-height:1.7;color:#53617b}.proof-conclusion{border-radius:14px;background:#edf9f4;color:#08734b;padding:13px 15px;font-size:14px;font-weight:800;margin-top:4px}
@media(max-width:800px){.g7g-check-steps{grid-template-columns:1fr 1fr}.proof-panel{grid-template-columns:1fr}.g7g-svg{min-height:240px}}@media(max-width:560px){.g7g-card{padding:15px}.g7g-head h3{font-size:20px}.g7g-head p{font-size:14px}.g7g-controls{align-items:stretch}.g7g-range{width:100%}.g7g-check-steps{grid-template-columns:1fr}}


/* V18 — кольорове предметне пояснення */
.rich-explain{border-radius:26px;padding:22px;margin:12px 0 22px;border:1px solid #dfe7f4;background:linear-gradient(135deg,#f7faff,#eef5ff)}
.rich-violet{background:linear-gradient(135deg,#fbf7ff,#f1eafe)}.rich-blue{background:linear-gradient(135deg,#f4f8ff,#eaf1ff)}.rich-cyan{background:linear-gradient(135deg,#f3fcff,#e7f8ff)}.rich-teal{background:linear-gradient(135deg,#f2fffb,#e8f8f4)}.rich-orange{background:linear-gradient(135deg,#fff9f0,#fff0dc)}.rich-amber{background:linear-gradient(135deg,#fffaf0,#fff3d6)}.rich-rose{background:linear-gradient(135deg,#fff6f8,#ffebf0)}.rich-green{background:linear-gradient(135deg,#f4fff5,#e9f8ec)}.rich-indigo{background:linear-gradient(135deg,#f5f6ff,#eaecff)}.rich-emerald{background:linear-gradient(135deg,#f1fff9,#e7f8ef)}.rich-purple{background:linear-gradient(135deg,#faf6ff,#f0e7ff)}.rich-slate{background:linear-gradient(135deg,#f8fafc,#eef2f7)}
.rich-hook{display:grid;grid-template-columns:72px 1fr;gap:18px;align-items:start}.rich-icon{width:64px;height:64px;display:grid;place-items:center;border-radius:20px;background:#fff;font-size:31px;box-shadow:0 8px 24px rgba(33,55,98,.09)}.rich-hook span,.rich-section-title span{font-size:10px;font-weight:900;letter-spacing:.12em;color:#4566ac}.rich-hook h2,.rich-section-title h2{margin:5px 0 9px;color:#12254a}.rich-hook p,.rich-why p,.rich-habit p{font-size:16px;line-height:1.8;color:#42516b;margin:0}.rich-why{margin-top:17px;padding:15px 17px;background:rgba(255,255,255,.72);border-radius:17px;border:1px solid rgba(152,168,197,.22)}.rich-why b{color:#1c3d78}
.rich-concepts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0 24px}.rich-concept{position:relative;padding:20px;border-radius:20px;border:1px solid #e2e8f2;background:#fff;overflow:hidden}.rich-concept>span{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:11px;background:#eaf1ff;color:#3158b4;font-weight:900;font-size:12px}.rich-concept.c1>span{background:#e9f8f2;color:#18745c}.rich-concept.c2>span{background:#fff1df;color:#a85a08}.rich-concept.c3>span{background:#f2eafd;color:#7447a7}.rich-concept h3{font-size:18px;color:#14294f;margin:12px 0 7px}.rich-concept p{font-size:14px;line-height:1.75;color:#59677f;margin:0}
.rich-formula-zone{margin:28px 0}.rich-section-title{margin-bottom:13px}.rich-formulas{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.rich-formulas article{position:relative;background:#fff;border:1px solid #dfe6f1;border-radius:20px;padding:20px}.rich-formula-no{position:absolute;right:16px;top:14px;font-size:11px;font-weight:900;color:#96a3b8}.rich-formulas h3{font-size:16px;color:#172a4b;margin:0 34px 10px 0}.rich-formula{display:grid;place-items:center;min-height:92px;background:#f6f8fc;border-radius:16px;padding:14px;overflow:auto}.rich-formulas p{font-size:13px;line-height:1.65;color:#58667f}.rich-read{padding-top:9px;border-top:1px dashed #dfe5ef}.rich-habit{display:grid;grid-template-columns:180px 1fr;gap:16px;align-items:start;padding:18px 20px;border-radius:20px;background:#102a56;color:white;margin:20px 0}.rich-habit div{font-weight:800}.rich-habit div span{font-size:24px;display:block;margin-bottom:6px}.rich-habit p{color:#e5edff;font-size:14px}
.rich-alert{padding:20px;border-radius:22px;background:#fff7f5;border:1px solid #ffd9d1;margin:22px 0}.rich-alert .rich-section-title span{color:#b44a32}.rich-mistakes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.rich-mistakes div{padding:13px 14px;background:#fff;border:1px solid #ffe1db;border-radius:14px;color:#6c3d34;font-size:13px;line-height:1.55}.rich-check{background:#f5f8fe;border:1px solid #dfe6f2;border-radius:18px;padding:14px 18px;margin:18px 0}.rich-check summary{cursor:pointer;font-weight:800;color:#24477e}.rich-check li{margin:9px 0;line-height:1.55;color:#50617d}
.rich-example{background:#fff;border:1px solid #dfe6f1;border-radius:24px;padding:21px;margin:15px 0;box-shadow:0 10px 28px rgba(31,50,86,.05)}.rich-example-head>span{font-size:10px;font-weight:900;letter-spacing:.12em;color:#3158b4}.rich-example-head h3{font-size:20px;color:#13284d;margin:7px 0 16px}.rich-example-steps{display:grid;gap:10px}.rich-step{display:grid;grid-template-columns:38px 1fr;gap:12px;padding:13px;border-radius:15px;background:#f7f9fd}.rich-step>b{width:32px;height:32px;border-radius:10px;background:#3158b4;color:#fff;display:grid;place-items:center}.rich-step strong{color:#1b315a;font-size:14px}.rich-step p{margin:5px 0 0;color:#6a7690;font-size:12px;line-height:1.55}.rich-example-check{display:flex;gap:10px;margin-top:12px;padding:11px 13px;border-radius:13px;background:#eefaf4;color:#2d6f55}.rich-example-check p{margin:0;font-size:12px;line-height:1.55}.rich-answer{margin-top:12px;padding:11px 13px;border-radius:13px;background:#edf3ff;color:#284d91;font-size:14px}.rich-answer b{margin-right:8px}
@media(max-width:760px){.rich-concepts,.rich-formulas,.rich-mistakes{grid-template-columns:1fr}.rich-hook{grid-template-columns:52px 1fr}.rich-icon{width:48px;height:48px;border-radius:15px;font-size:24px}.rich-hook p{font-size:15px}.rich-habit{grid-template-columns:1fr}.rich-example{padding:16px}}


.rich-story{margin:24px 0;padding:22px;border-radius:24px;background:#fff;border:1px solid #dfe6f1}.rich-story article{display:grid;grid-template-columns:38px 1fr;gap:12px;padding:14px 0;border-top:1px solid #edf0f5}.rich-story article:first-of-type{border-top:0}.rich-story-dot{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:#142f5d;color:#fff;font-size:11px;font-weight:900}.rich-story h3{font-size:17px;color:#18315a;margin:1px 0 6px}.rich-story p{font-size:14px;line-height:1.8;color:#596980;margin:0}

/* V19 editorial learning: colorful, visual and non-template explanations */
.editorial-board{display:grid;grid-template-columns:1.35fr .9fr;gap:14px;margin:20px 0}.editorial-board-main,.editorial-recognize{border-radius:24px;padding:22px;border:1px solid #dfe6f1}.editorial-board-main{background:linear-gradient(135deg,#102a56,#274d89);color:#fff;position:relative;overflow:hidden}.editorial-board-main:after{content:"";position:absolute;width:170px;height:170px;border-radius:50%;right:-55px;top:-75px;background:rgba(255,255,255,.08)}.editorial-board-main>span,.visual-checklist span,.mini-lab span{font-size:9px;font-weight:900;letter-spacing:.14em}.editorial-board-main>span{color:#c8d9ff}.editorial-board-main h2{color:#fff;font-size:23px;margin:6px 0 10px}.editorial-board-main p{color:#e8efff;font-size:15px;line-height:1.8;margin:0}.editorial-recognize{background:linear-gradient(135deg,#fff9ec,#fff2d7);border-color:#f3dfae}.editorial-recognize b{color:#865900}.editorial-recognize p{font-size:14px;line-height:1.75;color:#6d5b35}.visual-checklist{display:grid;grid-template-columns:70px 1fr;gap:17px;align-items:start;padding:20px;border-radius:22px;background:linear-gradient(135deg,#effcf7,#e6f7f1);border:1px solid #cfe9df;margin:18px 0}.visual-check-icon{width:58px;height:58px;border-radius:18px;background:#fff;display:grid;place-items:center;font-size:28px;box-shadow:0 8px 20px rgba(29,101,76,.08)}.visual-checklist span{color:#18745c}.visual-checklist h3{margin:5px 0 8px;color:#174c3d}.visual-checklist ol{margin:0;padding-left:19px;display:grid;grid-template-columns:1fr 1fr;gap:7px 24px}.visual-checklist li{font-size:13px;line-height:1.55;color:#49685e}.fact-zone{margin:26px 0}.fact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.fact-card{border:1px solid #e0e6f1;border-radius:20px;padding:19px;background:#fff;position:relative}.fact-card>span{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:10px;background:#eaf1ff;color:#3158b4;font-size:11px;font-weight:900}.fact-card.f1>span{background:#e9f8f2;color:#18745c}.fact-card.f2>span{background:#fff1df;color:#a85a08}.fact-card.f3>span{background:#f2eafd;color:#7447a7}.fact-card h3{font-size:17px;margin:10px 0 7px;color:#17305a}.fact-card p{font-size:13.5px;line-height:1.72;color:#5b6b83}.fact-math{margin-top:12px;padding:12px;border-radius:14px;background:#f6f8fc;text-align:center;overflow:auto}.mini-lab{display:grid;grid-template-columns:1.25fr .9fr;gap:14px;padding:20px;border-radius:22px;background:linear-gradient(135deg,#f7f2ff,#eee5ff);border:1px solid #ded0f4;margin:22px 0}.mini-lab span{color:#7046a1}.mini-lab h3{margin:5px 0 8px;color:#412866}.mini-lab p{font-size:14px;line-height:1.7}.mini-lab details{background:#fff;border:1px solid #e5dcf1;border-radius:15px;padding:12px}.mini-lab details details{margin-top:8px}.mini-lab summary{font-weight:800;color:#5b3c82;cursor:pointer}@media(max-width:760px){.editorial-board,.fact-grid,.mini-lab{grid-template-columns:1fr}.visual-checklist{grid-template-columns:52px 1fr}.visual-check-icon{width:46px;height:46px}.visual-checklist ol{grid-template-columns:1fr}}

/* V29 — Grade 10 interactive polish */
.a8-classify-item{padding:14px 16px;margin-bottom:12px;border:1px solid #dce5f3;border-radius:14px;background:#f7f9fd;font-weight:700;line-height:1.55}.plot-task-wrap{display:grid;gap:12px}.plot-task-note{margin:0;color:#62708a;font-size:14px}.plot-task-svg{width:100%;max-width:620px;background:#fff;border:1px solid #dbe4f0;border-radius:16px}.plot-grid{stroke:#e8edf5;stroke-width:1}.plot-axis{stroke:#71809a;stroke-width:1.7}.plot-label{fill:#68758d;font-size:12px}.plot-hit{fill:transparent;stroke:transparent;cursor:pointer}.plot-hit:hover{fill:#dbeafe;stroke:#93c5fd}.plot-hit.picked{fill:#2563eb;stroke:#1d4ed8;stroke-width:2}.plot-curve{fill:none;stroke:#0f766e;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}.plot-actions{display:flex;gap:10px;flex-wrap:wrap}

/* V34 — сезонна оплата НМТ */
.nmt-season-price{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0 4px}.nmt-season-price>div{padding:16px;border:1px solid rgba(255,255,255,.18);border-radius:18px;background:rgba(255,255,255,.08);backdrop-filter:blur(8px)}.nmt-season-price small{display:block;color:#b9c9f7;font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:.08em}.nmt-season-price strong{display:block;color:#fff;font-size:24px;line-height:1.1;margin:4px 0}.nmt-season-price span{color:#dbe5ff;font-size:11px}.nmt-season-price p{grid-column:1/-1;margin:0;padding:11px 13px;border-radius:14px;background:rgba(0,0,0,.16);color:#dbe5ff;font-size:11px;line-height:1.6}@media(max-width:700px){.nmt-season-price{grid-template-columns:1fr}}