@import "https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Inter:wght@400;500;600;700;800&family=Noto+Sans+Arabic:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700;800&family=Vazirmatn:wght@400;500;600;700;800&display=swap";:root{color:#f1f3ff;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;--bg:#0b1020;--panel:#12192fd1;--panel-solid:#12192f;--border:#9da9da21;--muted:#8d98b8;--purple:#8b7cff;--purple-bright:#a397ff;--blue:#65a8ff;--green:#55d6a0;background:#0b1020;font-family:Inter,Vazirmatn,Noto Sans Arabic,sans-serif}*{box-sizing:border-box}body{background:var(--bg);min-width:320px;min-height:100vh;margin:0}button,select{font:inherit}button{color:inherit}button:focus-visible,select:focus-visible{outline:2px solid var(--purple-bright);outline-offset:3px}button:disabled{opacity:.5;cursor:not-allowed!important}.app-shell{background:radial-gradient(ellipse at 60% -25%, #574abf2e, transparent 52%), var(--bg);min-height:100vh;position:relative;overflow:hidden}.ambient{filter:blur(90px);pointer-events:none;opacity:.13;border-radius:50%;position:absolute}.ambient-one{background:#7764ff;width:300px;height:300px;top:180px;right:-200px}.ambient-two{background:#256bce;width:220px;height:220px;bottom:0;left:-170px}.topbar{border-bottom:1px solid var(--border);z-index:2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:#0a0f1ea6;justify-content:space-between;align-items:center;height:82px;padding:0 clamp(20px,4.5vw,68px);display:flex;position:relative}.brand-button{text-align:start;cursor:pointer;background:0 0;border:0;align-items:center;gap:12px;padding:0;display:flex}.brand-mark{color:#fff;background:linear-gradient(140deg,#9b8cff,#6955df);border-radius:13px;place-items:center;width:43px;height:43px;font:700 15px DM Mono,monospace;display:grid;box-shadow:0 7px 24px #7865ff35}.brand-copy{flex-direction:column;gap:4px;display:flex}.brand-copy strong{letter-spacing:-.3px;font-size:16px}.brand-copy small{color:var(--muted);font-size:10px}.top-actions{align-items:center;gap:13px;display:flex}.connection-pill{border:1px solid var(--border);color:#bac4df;white-space:nowrap;background:#11182a;border-radius:30px;align-items:center;gap:8px;padding:8px 12px;font-size:11px;display:inline-flex}.status-dot,.live-dot{background:#69748f;border-radius:50%;flex:none;width:7px;height:7px;display:inline-block}.is-online .status-dot,.good .status-dot,.saved-note .status-dot,.live-dot{background:var(--green);box-shadow:0 0 10px #55d6a055}.is-offline .status-dot,.bad .status-dot{background:#ff927d}.avatar-button{color:#c6bcff;cursor:pointer;background:linear-gradient(140deg,#27214f,#1b2442);border:1px solid #a497ff55;border-radius:12px;width:38px;height:38px;font-size:12px;font-weight:800}.main-layout{z-index:1;grid-template-columns:220px minmax(0,1fr);max-width:1500px;margin:0 auto;display:grid;position:relative}.sidebar{border-inline-end:1px solid var(--border);flex-direction:column;min-height:calc(100vh - 82px);padding:30px 17px 22px;display:flex}.side-label{color:#596582;letter-spacing:2px;padding:0 12px 15px;font:500 10px DM Mono,monospace}.nav-item{color:#8d98b8;text-align:start;cursor:pointer;background:0 0;border:0;border-radius:11px;align-items:center;gap:13px;width:100%;margin:3px 0;padding:13px 12px;font-size:12px;transition:all .2s;display:flex;position:relative}.nav-item:hover{color:#e2e5ff;background:#ffffff08}.nav-item.active{color:#c6bdff;background:linear-gradient(100deg,#8170ff24,#8170ff08);box-shadow:inset 0 0 0 1px #9282ff20}.nav-icon{background:#ffffff06;border-radius:7px;place-items:center;width:23px;height:23px;font-size:16px;display:grid}.nav-item.active .nav-icon{color:var(--purple-bright);background:#8a79ff25}.nav-active-mark{inset-inline-start:0;background:var(--purple);border-radius:4px;width:3px;position:absolute;top:12px;bottom:12px}.sidebar-bottom{border-top:1px solid var(--border);margin-top:auto;padding:22px 12px 0}.mini-code-icon{color:#9486ff;font:700 16px DM Mono,monospace}.sidebar-bottom p{color:#74809f;font-size:11px;line-height:1.8}.sidebar-bottom>span{color:#4d5874;letter-spacing:1px;font:10px DM Mono,monospace}.content-area{min-width:0;padding:43px clamp(22px,4vw,58px) 25px}.welcome-row,.page-title-row{justify-content:space-between;align-items:center;gap:20px;margin-bottom:29px;display:flex}.eyebrow,.section-kicker{color:#8e82ff;letter-spacing:1.6px;align-items:center;gap:8px;font:500 9px DM Mono,monospace;display:flex}.eyebrow-line{background:var(--purple);width:19px;height:1px;display:inline-block}h1{letter-spacing:-.9px;margin:13px 0 8px;font-size:clamp(24px,2.7vw,34px);font-weight:750;line-height:1.3}.muted{color:var(--muted)}.lead{margin:0;font-size:12px}.welcome-badge{border:1px solid var(--border);background:#151c31a6;border-radius:14px;flex:none;align-items:center;gap:11px;padding:10px 14px;display:flex}.welcome-badge>span{color:#a99dff;font-size:22px}.welcome-badge div{flex-direction:column;gap:4px;display:flex}.welcome-badge small{color:var(--muted);font-size:10px}.welcome-badge strong{font-size:12px}.stats-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-bottom:35px;display:grid}.stat-card{border:1px solid var(--border);background:linear-gradient(135deg,#151c31e8,#11182bde);border-radius:16px;min-height:142px;padding:19px 20px 16px;position:relative;overflow:hidden}.points-card{background:linear-gradient(125deg,#29234f 0%,#1a2040 64%,#171e35 100%);border-color:#a296ff25}.stat-top{color:#a5afcb;justify-content:space-between;align-items:center;gap:8px;font-size:11px;display:flex}.stat-icon{border-radius:9px;place-items:center;width:29px;height:29px;font-size:15px;display:grid}.stat-icon.purple{color:#b4a9ff;background:#9b8bff1e}.stat-icon.blue{color:#84bdff;background:#64a9ff18}.stat-icon.green{color:#70e4b5;background:#55d6a018}.stat-icon.orange{color:#ffb39b;background:#ff947e18}.stat-value{letter-spacing:-1px;margin-top:12px;font-size:30px;font-weight:750}.stat-foot{color:#7783a2;margin-top:7px;font-size:10px}.tiny-spark{color:var(--green)}.stat-decoration{border:1px solid #b6aaff13;border-radius:50%;width:100px;height:100px;position:absolute;bottom:-49px;right:-34px;box-shadow:0 0 0 12px #b6aaff07,0 0 0 25px #b6aaff05}.status-value{align-items:center;gap:8px;margin-top:18px;font-size:18px;font-weight:700;display:flex}.status-value.good{color:var(--green)}.status-value.bad{color:#ff9a86}.section-heading{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.section-heading h2{margin:7px 0 0;font-size:17px}.heading-orbit{color:#7f73d8;font-size:25px}.hero-card{background:radial-gradient(at 80% 40%,#6652bf24,#0000 45%),linear-gradient(112deg,#1c2040,#151a31 70%);border:1px solid #9385ff2c;border-radius:19px;align-items:center;min-height:245px;padding:30px clamp(22px,3.5vw,43px);display:flex;position:relative;overflow:hidden}.hero-content{z-index:1;width:58%;position:relative}.hero-chip{color:#b2a9ff;letter-spacing:1px;background:#8a7bff0c;border:1px solid #8d7cff35;border-radius:30px;align-items:center;gap:8px;padding:7px 10px;font:9px DM Mono,monospace;display:inline-flex}.hero-chip .live-dot{width:5px;height:5px}.hero-content h2{margin:16px 0 8px;font-size:27px}.hero-content p{color:#9ca7c6;max-width:340px;margin:0 0 21px;font-size:12px;line-height:1.9}.primary-button{color:#fff;cursor:pointer;background:linear-gradient(120deg,#9384ff,#7665e8);border:1px solid #b3a7ff66;border-radius:10px;justify-content:center;align-items:center;gap:19px;padding:12px 15px;font-size:11px;font-weight:700;transition:transform .18s,filter .18s;display:inline-flex;box-shadow:0 6px 22px #7562f526}.primary-button:hover:not(:disabled){filter:brightness(1.08);transform:translateY(-1px)}.button-arrow{font-size:16px;line-height:10px}.hero-art{inset-inline-end:0;place-items:center;width:42%;height:220px;display:grid;position:absolute;top:12px}.art-ring{border:1px solid #9485ff20;border-radius:50%;position:absolute;transform:rotate(-20deg)}.ring-a{width:220px;height:155px}.ring-b{width:175px;height:210px;transform:rotate(34deg)}.code-window{z-index:1;background:linear-gradient(145deg,#252849ef,#141a31f2);border:1px solid #a79bff45;border-radius:12px;width:174px;height:128px;padding:14px;position:relative;transform:rotate(-5deg);box-shadow:0 18px 50px #0005,inset 0 1px #ffffff0a}.window-dots{gap:4px;margin-bottom:17px;display:flex}.window-dots i{background:#7b719f;border-radius:50%;width:5px;height:5px}.window-dots i:first-child{background:#ff8d9c}.window-dots i:nth-child(2){background:#f8cc79}.window-dots i:nth-child(3){background:#64d6a2}.code-line{background:#8c7cff75;border-radius:3px;height:4px;margin:8px 0}.line-short{width:36%}.line-long{background:#68baff70;width:75%}.line-mid{background:#c48bff77;width:57%}.line-last{width:44%}.code-symbol{color:#c1b8ff;font:700 20px DM Mono,monospace;position:absolute;bottom:13px;right:14px}.floating-star{color:#b4a7ff;position:absolute}.star-a{font-size:19px;top:24px;right:22%}.star-b{color:#67b5ff;font-size:24px;bottom:27px;left:19%}.quick-row{grid-template-columns:1fr 1fr;gap:14px;margin-top:15px;display:grid}.quick-card{text-align:start;border:1px solid var(--border);cursor:pointer;background:#141b30a8;border-radius:13px;align-items:center;gap:12px;min-width:0;padding:15px;transition:border-color .2s,background .2s;display:flex}.quick-card:hover{background:#191f39;border-color:#8f80ff50}.quick-icon{color:#aa9fff;background:#8c7cff17;border-radius:10px;flex:none;place-items:center;width:36px;height:36px;font-size:19px;display:grid}.quick-card>span:nth-child(2){flex-direction:column;flex:1;gap:5px;min-width:0;display:flex}.quick-card strong{font-size:11px}.quick-card small{color:#7f8aaa;font-size:9px;line-height:1.6}.quick-card>b{color:#7c73bf;font-size:16px}.page-stack{max-width:900px;margin:0 auto}.page-title-row{align-items:flex-start;margin-bottom:27px}.page-title-row h1{margin-bottom:5px}.page-title-row p{max-width:590px;margin:0;font-size:12px;line-height:1.8}.big-page-icon{color:#9a8dff;background:#8c7cff13;border:1px solid #8c7cff28;border-radius:14px;padding:14px 17px;font-size:29px}.ghost-button,.outline-button{border:1px solid var(--border);color:#bac3df;cursor:pointer;white-space:nowrap;background:#151c30;border-radius:9px;padding:10px 13px;font-size:11px}.ghost-button:hover,.outline-button:hover{border-color:#9283ff60}.filter-panel{border:1px solid var(--border);background:#131a2e;border-radius:14px;align-items:end;gap:13px;margin-bottom:18px;padding:17px;display:flex}.filter-panel label{color:#98a4c3;flex-direction:column;flex:1;gap:8px;min-width:0;font-size:10px;display:flex}.filter-panel select{color:#e4e8ff;background:#0e1528;border:1px solid #2b3551;border-radius:8px;outline:none;width:100%;padding:10px;font-size:11px}.refresh-button{height:37px}.question-card,.progress-panel,.settings-panel{border:1px solid var(--border);background:linear-gradient(145deg,#151c31ed,#10172aee);border-radius:17px;padding:clamp(18px,3vw,29px)}.question-meta{justify-content:space-between;align-items:center;gap:12px;display:flex}.question-number{color:#b6bfe0;font:11px DM Mono,monospace}.question-number span{color:#707d9f}.tag-row{flex-wrap:wrap;gap:7px;display:flex}.tag{color:#b7adff;background:#8a7bff16;border:1px solid #8a7bff20;border-radius:6px;padding:6px 9px;font-size:9px}.difficulty-intermediate{color:#ffce8a;background:#ffb44a10;border-color:#ffb44a25}.difficulty-advanced{color:#ff9ba8;background:#ff6e8710;border-color:#ff6e8725}.question-progress,.progress-track{background:#252e49;border-radius:9px;width:100%;height:4px;margin:18px 0 24px;overflow:hidden}.question-progress span,.progress-track span{border-radius:inherit;background:linear-gradient(90deg,#7e70ff,#58b5ff);height:100%;transition:width .25s;display:block}.question-text{white-space:pre-wrap;overflow-wrap:anywhere;margin:0 0 23px;font-size:clamp(17px,2vw,22px);font-weight:650;line-height:1.7}.options-list{flex-direction:column;gap:10px;display:flex}.option-button{text-align:start;cursor:pointer;background:#11182a;border:1px solid #2a3450;border-radius:10px;align-items:center;gap:13px;width:100%;padding:12px 14px;transition:all .16s;display:flex}.option-button:hover:not(:disabled){background:#191e38;border-color:#8b7cff80}.option-letter{color:#9da8c8;border:1px solid #36415f;border-radius:8px;flex:none;place-items:center;width:28px;height:28px;font:11px DM Mono,monospace;display:grid}.option-text{color:#d6dcf3;white-space:pre-wrap;overflow-wrap:anywhere;flex:1;min-width:0;font-size:12px;line-height:1.7}.option-check{color:var(--green);font-size:14px}.option-selected{background:#8c7cff16!important;border-color:#9a8bff!important}.option-selected .option-letter{color:#c8c0ff;background:#8c7cff25;border-color:#a397ff}.option-correct{background:#55d6a010!important;border-color:#4dc99a80!important}.option-correct .option-letter{color:#69e0ae;border-color:#55d6a060}.option-wrong{background:#ff897a0b!important;border-color:#ff897a80!important}.option-wrong .option-letter{color:#ff9b8e;border-color:#ff897a60}.feedback-panel{border:1px solid;border-radius:11px;margin-top:20px;padding:15px}.feedback-correct{background:#55d6a00b;border-color:#55d6a044}.feedback-wrong{background:#ff897a09;border-color:#ff897a40}.feedback-title{color:#6fe0af;font-size:13px;font-weight:750}.feedback-wrong .feedback-title{color:#ff9b8e}.feedback-explanation{border-top:1px solid var(--border);margin-top:13px;padding-top:12px}.feedback-explanation strong{font-size:11px}.feedback-explanation p{color:#a8b3d1;white-space:pre-wrap;overflow-wrap:anywhere;font-size:12px;line-height:1.8}.earned-points{color:#a9b4d3;font-size:11px}.earned-points strong{color:#74e0b1}.question-actions{justify-content:space-between;align-items:center;gap:15px;margin-top:23px;display:flex}.question-hint{color:#6e7a99;font-size:10px}.inline-error{color:#ff9b8e;font-size:11px}.empty-state{text-align:center;color:var(--muted);border:1px dashed #303a58;border-radius:15px;padding:55px 15px}.empty-state h3{color:#d3daf2;font-size:14px}.empty-state p{font-size:12px}.empty-symbol{color:#8275e9;font-size:38px}.loader{border:2px solid #353c5a;border-top-color:var(--purple);border-radius:50%;width:29px;height:29px;margin:0 auto;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.error-panel{background:#ff897a08;border:1px solid #ff897a40;border-radius:13px;padding:22px}.error-panel strong{color:#ff9b8e}.error-panel p{color:var(--muted);font-size:12px}.progress-stats{margin-top:25px}.progress-panel{margin-top:18px}.panel-heading{justify-content:space-between;align-items:center;gap:12px;display:flex}.panel-heading h2{margin:8px 0 0;font-size:16px}.progress-circle{color:#c0b7ff;border:3px solid #8c7cff66;border-radius:50%;place-items:center;width:55px;height:55px;font-size:13px;font-weight:700;display:grid}.progress-track{height:7px;margin:25px 0 12px}.progress-legend,.session-points-row{color:#8d99b9;justify-content:space-between;gap:12px;padding:7px 0;font-size:11px;display:flex}.progress-legend strong{color:#d5dbf2}.session-points-row{border-top:1px solid var(--border);margin-top:13px;padding-top:15px}.session-points-row strong{color:#72e1b1}.small-note{color:#7582a3;margin:17px 0;font-size:10px;line-height:1.8}.settings-panel{margin-bottom:16px}.settings-section-head{align-items:center;gap:13px;margin-bottom:22px;display:flex}.settings-icon{color:#b5aaff;background:#8c7cff1b;border-radius:12px;place-items:center;width:42px;height:42px;font-size:21px;display:grid}.settings-section-head h2,.connection-panel h2{margin:0 0 6px;font-size:15px}.settings-section-head p{color:var(--muted);margin:0;font-size:11px;line-height:1.7}.language-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:11px;display:grid}.language-option{cursor:pointer;text-align:start;background:#11182a;border:1px solid #2b3550;border-radius:11px;flex-direction:column;align-items:flex-start;gap:9px;min-height:91px;padding:17px 13px;display:flex;position:relative}.language-option strong{font-size:12px}.language-option small{color:#7c88a8;font:10px DM Mono,monospace}.language-active{background:#8c7cff13;border-color:#9384ffb0;box-shadow:inset 0 0 0 1px #8c7cff17}.language-check{top:9px;color:#a99fff;font-size:12px;position:absolute;inset-inline-end:9px}.saved-note{color:#8c99b7;align-items:center;gap:8px;margin-top:19px;font-size:10px;display:flex}.connection-panel{flex-wrap:wrap;align-items:center;gap:15px;display:flex}.connection-panel>div{flex:1;min-width:180px}.connection-panel .muted{overflow-wrap:anywhere;font-size:10px}.mobile-footer{color:#586582;border-top:1px solid var(--border);align-items:center;gap:10px;margin-top:36px;padding:20px 0 0;font-size:9px;display:flex}.mobile-footer .brand-mark{border-radius:8px;width:27px;height:27px;font-size:10px}.mobile-footer span:last-child{margin-inline-start:auto;font-family:DM Mono,monospace}.mobile-nav{display:none}.rtl{font-family:Vazirmatn,Inter,Noto Sans Arabic,sans-serif}.rtl .eyebrow,.rtl .section-kicker{letter-spacing:0}.rtl .stat-value,.rtl .status-value,.rtl .progress-circle{font-variant-numeric:tabular-nums}:lang(zh){font-family:Inter,Noto Sans SC,sans-serif}@media (width>=1450px){.content-area{padding-top:55px}.hero-card{min-height:270px}}@media (width<=1000px){.main-layout{grid-template-columns:185px minmax(0,1fr)}.content-area{padding-inline:25px}.welcome-badge{display:none}.hero-art{opacity:.75;inset-inline-end:-15px}.hero-content{width:65%}.language-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=700px){.topbar{height:68px;padding:0 17px}.brand-mark{width:38px;height:38px}.brand-copy small{display:none}.main-layout{display:block}.sidebar{display:none}.content-area{padding:28px 16px 22px}.welcome-row{margin-bottom:22px}.welcome-row h1{font-size:25px}.stats-grid{gap:9px;margin-bottom:28px}.stat-card{border-radius:12px;min-height:122px;padding:13px 12px}.stat-top{align-items:flex-start;font-size:9px}.stat-icon{width:24px;height:24px;font-size:12px}.stat-value{font-size:25px}.stat-foot{font-size:9px;line-height:1.5}.status-value{font-size:14px}.hero-card{align-items:flex-start;min-height:255px;padding:23px 19px}.hero-content{width:100%;max-width:390px}.hero-content h2{font-size:24px}.hero-content p{max-width:260px}.hero-art{top:65px;opacity:.26;width:48%;inset-inline-end:-65px}.quick-row{grid-template-columns:1fr;gap:9px}.quick-card{padding:12px}.mobile-nav{z-index:5;padding:9px 7px calc(9px + env(safe-area-inset-bottom));border-top:1px solid var(--border);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:#0e1425f5;justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0}.mobile-nav button{color:#7783a3;cursor:pointer;background:0 0;border:0;border-radius:9px;flex-direction:column;align-items:center;gap:3px;min-width:61px;padding:5px 8px;display:flex}.mobile-nav button>span{font-size:19px}.mobile-nav button small{font-size:9px}.mobile-nav button.mobile-active{color:#b6acff;background:#8c7cff15}.mobile-footer{margin-bottom:72px}.page-title-row{gap:10px}.page-title-row h1{font-size:25px}.page-title-row p{font-size:11px}.big-page-icon{padding:10px 12px;font-size:22px}.filter-panel{flex-wrap:wrap;gap:10px;padding:13px}.filter-panel label{flex-basis:calc(50% - 5px)}.refresh-button{flex:1}.question-card{padding:17px 14px}.question-text{font-size:17px}.option-button{gap:10px;padding:10px}.option-text{font-size:11px}.question-actions{flex-direction:column;align-items:flex-start}.question-hint{line-height:1.6}.progress-stats{grid-template-columns:1fr 1fr}.progress-stats .stat-card:first-child{grid-column:span 2}.language-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.connection-panel{align-items:flex-start}.connection-panel .connection-pill{margin-inline-start:0}}@media (width<=390px){.connection-pill{padding:7px 8px;font-size:10px}.top-actions{gap:7px}.stats-grid{grid-template-columns:1fr 1fr}.stats-grid .stat-card:last-child{grid-column:span 2}.progress-stats{grid-template-columns:1fr 1fr}.welcome-row h1{font-size:22px}}