*{box-sizing:border-box}body{color:#fff;background:linear-gradient(145deg,#5548e8 0%,#9136f0 48%,#f04790 100%);min-height:100vh;margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button{color:inherit;font:inherit;-webkit-tap-highlight-color:transparent;border:0}.hidden{display:none!important}.app-shell{width:min(100%,500px);min-height:100vh;margin:0 auto;padding:18px 16px 24px}.app-shell.platform-shell{width:100%;max-width:none;padding:0}.platform-header{justify-content:space-between;align-items:center;gap:18px;width:min(1120px,100% - 32px);margin:0 auto;padding:18px 0;display:flex}.platform-header img{background:#fff;border-radius:16px;width:92px;box-shadow:0 12px 28px #2b1a6238}.platform-header nav{flex-wrap:wrap;justify-content:flex-end;gap:10px;display:flex}.platform-header a{color:#ffffffe0;font-size:.95rem;font-weight:900;text-decoration:none}.platform-hero{grid-template-columns:minmax(0,1fr) 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small{text-align:left;font-size:.78rem}.certificate-footer{font-size:.95rem;margin-top:8px!important}.language-flag{font-size:1.45rem;line-height:1}.options-button{color:#202735;background:#fffffff0;border-radius:999px;align-self:flex-end;min-width:92px;min-height:40px;margin-bottom:12px;font-size:.9rem;font-weight:950;box-shadow:0 4px #261c5e2e}.safe-pill{color:#8d95a3;background:#f8f9fc;border-radius:999px;align-self:center;min-width:164px;margin-bottom:26px;padding:11px 22px;font-size:.94rem;font-weight:950;box-shadow:0 5px #261c5e2e}.streak-card{color:#fff;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff38;border-radius:999px;justify-content:center;align-self:center;align-items:center;gap:10px;min-width:228px;margin:0 0 24px;padding:10px 18px;font-weight:950;display:flex}.streak-card span{color:#ffffffd1}h1{color:#fff;margin:0;font-size:2.35rem;line-height:1.05}.screen-subtitle{color:#ffffffe0;margin:10px 0 40px;font-size:1rem;font-weight:800}.menu-list{gap:14px;margin-bottom:30px;display:grid}.rule-alert{color:#7c2d12;background:#fffffff0;border-radius:14px;margin:-18px 0 22px;padding:14px 16px;font-weight:900;line-height:1.35;box-shadow:0 5px #261c5e2e}.menu-card{min-height:90px;color:var(--accent);text-align:left;background:#fff;border-radius:14px;align-items:center;gap:16px;padding:16px;display:flex;box-shadow:0 6px #ffffff7a}.menu-card strong{font-size:1.28rem;font-weight:950}.menu-card:disabled,.mixed-button:disabled{opacity:.54;filter:grayscale(.35)}.menu-icon{background:var(--soft);border-radius:50%;place-items:center;width:56px;height:56px;font-size:1.6rem;font-weight:950;display:grid}.mixed-button{color:#fff;background:linear-gradient(135deg,#ffc42f,#ff751c);border-radius:14px;justify-content:center;align-items:center;gap:12px;min-height:76px;font-size:1.38rem;display:flex;box-shadow:0 6px #74263c6b}.reinforcement-button{color:#202735;background:#fff;border-radius:14px;justify-content:center;align-items:center;gap:12px;min-height:76px;margin-bottom:14px;font-size:1.28rem;display:flex;box-shadow:0 6px #ffffff7a}.history-button{color:#fff;background:#202735;border-radius:14px;justify-content:center;align-items:center;gap:12px;min-height:70px;margin-bottom:14px;font-size:1.18rem;display:flex;box-shadow:0 6px #14182261}.remove-ads-button{color:#202735;background:linear-gradient(135deg,#fff7ed,#fff);border-radius:14px;justify-content:center;align-items:center;gap:10px;min-height:64px;margin-bottom:14px;font-size:1.08rem;display:flex;box-shadow:0 5px #ffffff5c}.remove-ads-button.purchased{color:#166534;background:linear-gradient(135deg,#dcfce7,#fff)}.final-marathon-button{color:#202735;background:linear-gradient(135deg,#edf2ff,#fff);border-radius:14px;justify-content:center;align-items:center;gap:12px;min-height:70px;margin-bottom:14px;font-size:1.18rem;display:flex;box-shadow:0 6px #ffffff6b}.final-marathon-button.locked{opacity:.45;filter:grayscale(.85)}.marathon-dialog p{white-space:pre-line}.notification-button{color:#202735;background:#fffffff0;border-radius:14px;justify-content:center;align-items:center;gap:10px;min-height:62px;margin-bottom:14px;font-size:1.08rem;display:flex;box-shadow:0 5px #ffffff57}.back-button{color:#202735;background:#fffffff2;border-radius:50%;place-items:center;width:46px;height:46px;font-size:2rem;font-weight:950;display:grid;position:fixed;top:16px;left:max(16px,50vw - 234px);box-shadow:0 5px #261c5e2e}.table-menu{grid-template-columns:repeat(2,1fr);gap:14px;display:grid}.table-card{color:#202735;background:#fff;border-radius:14px;place-items:center;min-height:84px;font-size:2.1rem;font-weight:950;display:grid;position:relative;box-shadow:0 6px #ffffff7a}.table-card small{color:#4f46e5;text-align:center;font-size:.82rem;font-weight:950;position:absolute;bottom:8px;left:0;right:0}.table-card-main{place-items:center;width:100%;display:grid}.table-medal{font-size:1.55rem;line-height:1;position:absolute;top:-3px;right:14px}.review-list{gap:8px;margin-bottom:22px;display:grid}.review-row{color:#202735;background:#fffffff0;border-radius:12px;justify-content:center;align-items:center;min-height:48px;padding:10px 16px;font-size:1.12rem;font-weight:900;display:flex;box-shadow:0 4px #ffffff57}.review-row strong{color:#7d82ff;font-size:1.2rem}.lesson-top{grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:12px;display:grid}.exit-lesson-button{color:#202735;background:#fffffff0;border-radius:999px;align-self:flex-start;min-width:78px;min-height:40px;margin-bottom:12px;font-weight:950;box-shadow:0 4px #261c5e2e}.combo-pill{color:#202735;background:#fffffff0;border-radius:14px;justify-content:space-between;align-items:center;min-height:56px;padding:10px 14px;display:flex;box-shadow:0 5px #261c5e2e}.combo-pill span{color:#7d8490;font-size:.86rem;font-weight:900}.combo-pill strong{font-size:1.55rem;font-weight:950}.lesson-progress{color:#fff;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fff3;border-radius:14px;margin-bottom:16px;padding:12px}.lesson-progress>div:first-child{justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px;font-weight:950;display:flex}.lesson-progress strong{color:#ffffffdb}.lesson-progress-track{background:#ffffff47;border-radius:999px;height:12px;overflow:hidden}.lesson-progress-track span{border-radius:inherit;background:#fff;width:0;height:100%;transition:width .22s;display:block}.question-panel{color:#202735;background:#fff;border:0;border-radius:28px;padding:34px 32px 32px;box-shadow:0 22px 44px #1f125b38}.question-panel.right{outline:4px solid #24c36059}.question-panel.wrong{outline:4px solid #ff696c59}.equation{text-align:center;grid-template-columns:repeat(5,minmax(0,1fr));align-items:center;gap:7px;margin-bottom:30px;font-size:2.65rem;font-weight:950;display:grid}.equation span:nth-child(4){color:#7d82ff}.answer-display{color:#202735;background:#f1f2f4;border-radius:14px;place-items:center;min-height:94px;font-size:2rem;font-weight:950;display:grid;box-shadow:inset 0 2px 6px #21283514,inset 0 -3px #21283514}.answer-display.right{color:#159447;background:#e9fbea}.answer-display.wrong{color:#e04444;background:#fff0f0}.keypad{grid-template-columns:repeat(3,1fr);gap:9px 12px;width:min(100%,386px);margin:24px auto 0;display:grid}.keypad button{color:#202735;background:#fff;border-radius:14px;min-height:66px;font-size:1.7rem;font-weight:950;box-shadow:0 6px #20273529}.keypad .clear-key{color:#fff;background:#ff6b70}.keypad .ok-key{color:#fff;background:#27c45f}.lesson-result{color:#fff;text-align:center;min-height:32px;margin-top:16px;font-size:1.1rem;font-weight:950}.confirm-overlay{z-index:20;background:#160e3694;place-items:center;padding:20px;display:grid;position:fixed;inset:0}.confirm-dialog{color:#202735;text-align:center;background:#fff;border-radius:22px;width:min(100%,360px);padding:22px;box-shadow:0 24px 54px #1f125b47}.confirm-dialog h2{margin:0 0 8px;font-size:1.55rem}.confirm-dialog p{color:#6b7280;margin:0 0 18px;font-weight:850}.confirm-dialog button{border-radius:14px;width:100%;min-height:52px;font-weight:950;display:block}.confirm-exit{color:#fff;background:#ff6b70;margin-bottom:10px}.cancel-exit{color:#fff;background:#27c45f}.medal-result{color:#202735;background:#fffffff0;border-radius:18px;justify-items:center;gap:8px;margin:-18px 0 22px;padding:18px;display:grid;box-shadow:0 6px #ffffff57}.medal-result.gold{background:linear-gradient(135deg,#fff7c2,#ffd447)}.medal-result.silver{background:linear-gradient(135deg,#f8fafc,#cbd5e1)}.medal-result.bronze{background:linear-gradient(135deg,#ffe6c7,#d88945)}.medal-icon{font-size:3.2rem;line-height:1}.medal-result strong{font-size:1.7rem;font-weight:950}.medal-result span,.medal-result p,.medal-result small{margin:0;font-weight:900}.medal-result p{line-height:1.35}.medal-result small{color:#6b7280;line-height:1.35}.completion-stats{grid-template-columns:repeat(2,1fr);gap:10px;margin:-8px 0 18px;display:grid}.completion-stats div{color:#202735;background:#fffffff0;border-radius:14px;align-content:center;min-height:68px;padding:10px;display:grid;box-shadow:0 5px #ffffff57}.completion-stats span{color:#7d8490;font-size:.78rem;font-weight:950}.completion-stats strong{margin-top:3px;font-size:1.28rem;font-weight:950}.share-button{color:#fff;background:#202735;border-radius:14px;justify-content:center;align-items:center;gap:10px;width:100%;min-height:58px;margin-bottom:12px;font-weight:950;display:flex;box-shadow:0 6px #14182261}.memory-tip{color:#202735;text-align:left;background:#fffffff0;border-radius:18px;margin:-8px 0 22px;padding:16px;box-shadow:0 6px #ffffff57}.memory-tip strong{color:#4f46e5;margin-bottom:8px;font-size:1.1rem;font-weight:950;display:block}.memory-tip-equation{border-top:1px solid #4f46e529;margin-top:10px;padding-top:10px}.memory-tip-equation span{color:#202735;font-size:1.05rem;font-weight:950;display:block}.memory-tip p{color:#4b5563;margin:6px 0 0;font-weight:850;line-height:1.35}.history-header{align-items:center;min-height:48px;margin-bottom:16px;display:grid;position:relative}.history-header h1{text-align:center;font-size:1.45rem}.history-back-button{color:#202735;background:#ffffff14;border:1px solid #2027352e;border-radius:8px;place-items:center;width:48px;height:34px;font-size:1.25rem;font-weight:950;display:grid;position:absolute;left:0}.history-stats,.medal-stats{gap:8px;margin-bottom:10px;display:grid}.history-stats{grid-template-columns:repeat(2,1fr)}.medal-stats{grid-template-columns:repeat(3,1fr)}.history-stats>div,.medal-stats>div{color:#202735;background:#ffffff29;border-radius:12px;align-content:center;gap:2px;min-height:58px;padding:8px;display:grid}.history-stats span,.medal-stats span{color:#ffffffd1;font-size:.72rem;font-weight:950}.history-stats strong,.medal-stats strong{color:#fff;font-size:1.18rem;font-weight:950}.medal-stats .gold strong{color:#ffe58a}.medal-stats .silver strong{color:#e5e7eb}.medal-stats .bronze strong{color:#ffc185}.history-panel{background:0 0;margin-top:14px;padding:0}.history-panel h2{display:none}#historyList{gap:12px;display:grid}.history-result-card{color:#202735;text-align:left;background:#fff;border-radius:14px;align-items:flex-start;gap:10px;padding:14px 16px;display:flex;box-shadow:0 4px #ffffff6b}.history-medal{background:#eef2ff;border-radius:50%;place-items:center;width:32px;height:32px;font-size:1.1rem;display:grid}.history-main{flex:1;min-width:0}.history-card-top{justify-content:space-between;gap:12px;display:flex}.history-card-top div:last-child{text-align:right;min-width:78px}.history-card-top strong{font-size:.95rem;font-weight:950;display:block}.history-card-top div:last-child strong{color:#4f46e5;font-size:1.05rem}.history-card-top 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