:root{--bg:#f4f7fb;--surface:#fff;--surface-muted:#f8fbff;--text:#111827;--muted:#667085;--border:#e5e7eb;--border-strong:#d0d5dd;--brand:#0f766e;--brand-deep:#145c5a;--brand-soft:#e6f7f4;--accent:var(--brand);--accent-soft:var(--brand-soft);--teal:var(--brand);--teal-soft:#e6f7f4;--warm:#f59e0b;--accent-ink:#fff;--shadow-soft:0 18px 45px #223c5e1c;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{background:var(--bg);margin:0}body.modalOpen{overflow:hidden}a{color:inherit}button,input,select,textarea{letter-spacing:0}.marketingPage,.appPage,.authPage{background:radial-gradient(circle at 12% 8%, #0f766e14, transparent 28%), radial-gradient(circle at 88% 4%, #0f9f8f17, transparent 24%), linear-gradient(180deg, #fff 0%, var(--bg) 48%);color:var(--text);min-height:100vh}.marketingNav,.appTopbar{-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#ffffffd1;border:1px solid #e5e7ebb3;border-radius:18px;justify-content:space-between;align-items:center;gap:24px;max-width:1184px;margin:0 auto;padding:14px 18px;display:flex;position:relative;top:18px}.marketingNav nav,.appNav,.appAccount{align-items:center;gap:8px;display:flex}.marketingNav nav{background:#f8fbffe6;border:1px solid #dbe4f0f2;border-radius:999px;gap:4px;padding:4px}.marketingNav nav a,.marketingNav nav button,.appNav a,.appAccount button{color:var(--muted);cursor:pointer;font:inherit;font-size:var(--font-size-control);font-weight:var(--font-weight-medium);line-height:var(--line-height-tight);background:0 0;border:0;border-radius:999px;justify-content:center;align-items:center;min-height:38px;padding:0 16px;text-decoration:none;display:inline-flex}.marketingNav nav button{min-height:38px}.marketingNav nav .marketingLoginButton{background:linear-gradient(135deg, var(--brand), var(--brand-deep));color:#fff;box-shadow:0 8px 18px #0f766e2e}.appAccount button{background:0 0}.appAccount 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.appBrandMark{background:linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);border-radius:10px;width:36px;height:36px;position:relative;overflow:hidden;box-shadow:0 12px 26px #0f766e2e}.appBrand .appBrandMark:before,.appBrand .appBrandMark:after,.appBrand .appBrandMark span{content:"";background:#ffffffeb;border-radius:999px;position:absolute}.appBrand .appBrandMark:before{width:3px;height:18px;top:9px;left:9px;transform:rotate(-18deg)}.appBrand .appBrandMark:after{width:3px;height:18px;top:9px;right:9px;transform:rotate(18deg)}.appBrand .appBrandMark span{background:0 0;border:2px solid #ffffffdb;border-left:0;border-radius:999px;width:11px;height:16px;display:block;top:10px;left:13px}.marketingHero,.appHero{grid-template-columns:minmax(0,1.05fr) minmax(320px,.7fr);justify-content:space-between;align-items:flex-end;gap:32px;max-width:1184px;margin:0 auto;padding:112px 32px 56px;display:grid}.marketingHero{align-items:center;min-height:640px;padding-bottom:72px}.marketingHero h1,.appHero h1,.authHero h1{font-size:var(--font-size-page-title);font-weight:var(--font-weight-bold);letter-spacing:0;line-height:var(--line-height-tight);max-width:820px;margin-bottom:24px}.marketingHero .summary,.appHero .summary,.authHero .summary{color:var(--muted);font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-relaxed);max-width:720px}.marketingSection,.appSection{max-width:1184px;margin:0 auto;padding:32px}.sectionIntro{margin-bottom:24px}.sectionIntro h2{font-size:var(--font-size-panel-title);font-weight:var(--font-weight-bold);letter-spacing:0;line-height:var(--line-height-tight);margin-bottom:8px}.appGrid{gap:16px;display:grid}.appGrid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.appGrid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.profileGrid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px;display:grid}.uiCard{border:1px solid var(--border);background:#ffffffeb;border-radius:8px;gap:12px;min-height:160px;padding:24px;display:grid;box-shadow:0 10px 30px #223c5e0f}.uiCardMuted{background:var(--surface-muted)}.uiCard h3{font-size:var(--font-size-section-title);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);margin:0}.cardIndex{color:var(--teal);font-size:var(--font-size-meta);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);text-transform:uppercase}.metricValue{font-size:var(--font-size-task-title);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);display:block}.uiButton{cursor:pointer;font:inherit;font-size:var(--font-size-control);font-weight:var(--font-weight-medium);line-height:var(--line-height-tight);border-radius:8px;justify-content:center;align-items:center;min-height:44px;padding:0 18px;text-decoration:none;transition:background .15s,border-color .15s,color .15s,transform .15s;display:inline-flex}.uiButton:hover{transform:translateY(-1px)}.uiButton-primary{background:linear-gradient(135deg, var(--brand), var(--brand-deep));border:1px solid var(--brand-deep);color:var(--accent-ink)}.uiButton-secondary{background:var(--surface);border:1px solid var(--border-strong);color:var(--text)}.uiButton-ghost{color:var(--accent);background:0 0;border:1px solid #0000;justify-content:flex-start;padding-left:0}.uiButton:disabled{cursor:not-allowed;opacity:.55;transform:none}.uiField{gap:8px;display:grid}.uiField span{color:var(--muted);font-size:var(--font-size-control);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight)}.uiField input{background:var(--surface);border:1px solid var(--border-strong);color:var(--text);font:inherit;font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-normal);border-radius:8px;width:100%;min-height:44px;padding:0 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.panel{box-shadow:none;border-radius:8px;min-width:0}.authSignal{gap:16px;display:grid}.appLoading{color:var(--muted);font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-normal);max-width:1184px;margin:0 auto;padding:80px 32px}.officialHome,.cleanAuthPage{background:linear-gradient(#fff 0%,#f8fbff 52%,#f1f5f9 100%);overflow-x:hidden}.officialHome .marketingNav{z-index:5;background:#ffffffe6;border-color:#e2e8f0e6;border-radius:999px;width:calc(100% - 48px);position:relative;box-shadow:0 12px 36px #0f172a0d}.officialHome .marketingNav nav{flex-flow:row;min-width:0}.officialHero{text-align:center;place-items:center;min-height:calc(100svh - 18px);padding:92px 24px 28px;display:grid;position:relative;overflow:hidden}.officialHero:before{content:"";pointer-events:none;background:radial-gradient(circle at 50% 18%,#0f766e1c,#0000 30%),radial-gradient(circle at 50% 72%,#0f9f8f1a,#0000 34%);position:absolute;inset:0}.officialHeroContent{z-index:1;width:100%;max-width:940px;margin:0 auto;position:relative}.officialHero h1{color:#0f172a;font-size:var(--font-size-display-title);font-weight:var(--font-weight-bold);letter-spacing:0;line-height:var(--line-height-tight);overflow-wrap:anywhere;max-width:900px;margin:0 auto 22px}.officialHero .summary{color:#475467;font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-relaxed);max-width:720px;margin-left:auto;margin-right:auto}.officialHero .heroActions{justify-content:center;margin-top:24px}.officialHeroMeta{flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;margin-top:22px;display:flex}.officialHeroMeta span,.cleanAuthSignal span{color:#344054;font-size:var(--font-size-meta);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);background:#fff;border:1px solid #dbe4f0;border-radius:999px;padding:7px 10px}.officialHeroScene{pointer-events:none;z-index:1;width:min(100%,900px);max-width:900px;margin:34px auto 0;position:relative}.officialHeroScene img{object-fit:cover;object-position:top center;opacity:.98;border:1px solid #cbd5e1c7;border-radius:18px;width:100%;max-width:100%;height:min(34vw,340px);display:block;box-shadow:0 34px 90px #0f172a24}.sceneMini{text-align:left;background:#fff;border:1px solid #dbe4f0;border-radius:14px;gap:4px;min-width:184px;padding:16px;display:grid;position:absolute;bottom:18px;right:30px;box-shadow:0 18px 38px #0f172a1a}.sceneMini strong{color:var(--accent);font-size:var(--font-size-section-title);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight)}.sceneMini span{color:#475467;font-size:var(--font-size-meta);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight)}.officialEntrySection,.officialStartSection{max-width:1184px;margin:0 auto;padding:42px 32px}.officialSectionHead{justify-content:space-between;align-items:flex-end;gap:18px;margin-bottom:18px;display:flex}.officialSectionHead h2,.officialStartBand h2{color:#111827;font-size:var(--font-size-panel-title);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);margin:0}.officialEntryGrid{grid-template-columns:repeat(4,minmax(0,1fr));gap:0;margin-top:18px;display:grid}.officialEntryLink{color:inherit;border-top:1px solid #e2e8f0;gap:10px;min-height:150px;padding:22px 22px 22px 0;text-decoration:none;display:grid}.officialEntryLink+.officialEntryLink{padding-left:22px}.officialEntryLink:hover{color:var(--brand-deep)}.officialEntryLink span{color:var(--accent);font-size:var(--font-size-meta);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight)}.officialEntryLink strong{color:#111827;font-size:var(--font-size-section-title);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight)}.officialEntryLink p{color:#475467;font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-normal);margin:0}.officialStartSection{padding-bottom:76px}.officialStartBand{background:linear-gradient(135deg,#fffffffa,#eef4ffe6);border:1px solid #e2e8f0;border-radius:18px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:20px;padding:32px;display:grid}.officialStartBand p{color:#475467;font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-relaxed);max-width:620px;margin:12px 0 0}.cleanAuthPage{background:radial-gradient(circle at 20% 22%,#0f766e1c,#0000 30%),linear-gradient(#fff 0%,#f8fbff 100%);grid-template-columns:minmax(0,.84fr) minmax(390px,.58fr)}.cleanAuthPage .authHero{gap:32px;min-height:100vh}.cleanAuthPage .authHero h1{color:#0f172a;font-size:var(--font-size-page-title);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);margin-bottom:18px}.cleanAuthPage .authHero .summary{max-width:560px}.cleanAuthSignal{flex-wrap:wrap;align-content:end;gap:8px;display:flex}.cleanAuthPage .authPanelWrap{background:#ffffffeb}.cleanAuthPage .authPanelWrap .authLayoutCompact{padding:0}.cleanAuthPage .authFormPanel{background:#fff;border-color:#e2e8f0;padding:24px;box-shadow:0 24px 70px #0f172a14}.cleanAuthPage .authTabs{width:100%}.cleanAuthPage .authTabs button{flex:1 1 0}.cleanAuthPage .authFormStack input{border-radius:8px;min-height:46px}.cleanAuthPage .authSubmitRow,.cleanAuthPage .authSubmitRow .uiButton{width:100%}.qingxueAuthPage{background:radial-gradient(circle at 16% 16%,#0f766e1a,#0000 28%),radial-gradient(circle at 72% 78%,#0f766e14,#0000 30%),linear-gradient(#fff 0%,#f7fbff 54%,#eef5fb 100%);grid-template-columns:minmax(0,1fr) minmax(420px,.82fr);min-height:100vh;position:relative}.qingxueAuthHero{background-color:#0000;background-image:linear-gradient(#0f766e0a 1px,#0000 1px),linear-gradient(90deg,#0f766e08 1px,#0000 1px);background-position:0 0,0 0;background-repeat:repeat,repeat;background-size:84px 84px;background-attachment:scroll,scroll;background-origin:padding-box,padding-box;background-clip:border-box,border-box;padding:32px 42px;position:relative;overflow:hidden}.qingxueAuthHero>:not(.qingxueAuthDecor){z-index:1;position:relative}.qingxueAuthDecor{pointer-events:none;position:absolute;inset:0;overflow:hidden}.qingxueAuthBrand{color:#0f172a;align-items:center;gap:10px;text-decoration:none;display:inline-flex}.qingxueAuthBrand span{background:var(--brand);color:#fff;font-size:var(--font-size-caption);font-weight:var(--font-weight-bold);height:34px;line-height:var(--line-height-tight);border-radius:8px;justify-content:center;align-items:center;width:42px;display:inline-flex;box-shadow:0 12px 28px #0f766e2e}.qingxueAuthBrand strong{color:#0f172a;font-size:var(--font-size-subtitle);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight)}.qingxueAuthCopy{max-width:680px}.qingxueAuthCopy .eyebrow{color:#0f172a;font-size:var(--font-size-meta);font-weight:var(--font-weight-bold);letter-spacing:0;line-height:var(--line-height-tight)}.qingxueAuthCopy h1{color:#0f172a;font-size:var(--font-size-page-title);font-weight:var(--font-weight-bold);letter-spacing:0;line-height:var(--line-height-tight);overflow-wrap:break-word;margin:0 0 18px}.qingxueAuthCopy .summary{color:#475569;font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-relaxed);overflow-wrap:break-word;max-width:480px}.qingxueAuthPoem{color:#334155;font-size:var(--font-size-subtitle);font-weight:var(--font-weight-medium);line-height:var(--line-height-normal);margin:0}.authBreeze{border:1px solid #0000;border-top-color:#0f766e2e;border-radius:50%;width:520px;height:170px;animation:14s ease-in-out infinite motionBreeze;position:absolute}.authBreezeOne{--breeze-rotate:-11deg;top:28%;left:8%}.authBreezeTwo{--breeze-rotate:7deg;animation-delay:-6s;bottom:18%;right:8%}.authPageMark{opacity:.68;background:#ffffff94;border:1px solid #cbd5e1c7;border-radius:8px 8px 18px;width:64px;height:88px;animation:11s ease-in-out infinite motionPageFloat;position:absolute;box-shadow:0 18px 48px #0f172a12}.authPageMark:after{content:"";background:#0f766e29;border-radius:999px;width:34px;height:2px;position:absolute;top:22px;left:14px}.authPageMarkOne{--page-rotate-end:-4deg;--page-rotate-start:9deg;top:20%;right:18%}.authPageMarkTwo{--page-rotate-end:5deg;--page-rotate-start:-8deg;animation-delay:-5s;bottom:20%;left:18%}.authStudyMark{color:#3341556b;font-size:var(--font-size-meta);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);background:#ffffff8a;border:1px solid #cbd5e19e;border-radius:999px;justify-content:center;align-items:center;min-width:58px;min-height:40px;padding:0 14px;animation:12s ease-in-out infinite studyMarkerDrift;display:inline-flex;position:absolute;box-shadow:0 16px 40px #0f172a0d}.authStudyMarkChemistry{top:34%;left:19%}.authStudyMarkMath{animation-delay:-3s;top:43%;right:21%}.authStudyMarkCode{animation-delay:-6s;bottom:30%;right:32%}.qingxueAuthPanelWrap{-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffb8;border-left:1px solid #cbd5e1b3;justify-content:center;animation:.46s cubic-bezier(.2,.85,.2,1) both authPanelSlideFromRight}.qingxueAuthPanelWrap .authLayoutCompact{width:100%;max-width:500px}.qingxueAuthPanelWrap .authFormPanel{background:linear-gradient(#fffffffa,#f8fbfff0);border:1px solid #cbd5e1d1;border-radius:8px;padding:30px;overflow:hidden;box-shadow:0 34px 90px #0f172a1c}.qingxueAuthPanelWrap .authFormPanel h2{color:#0f172a;font-size:var(--font-size-panel-title);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);margin:0 0 10px}.qingxueAuthPanelWrap .authFormPanel .eyebrow{color:#0f766e;font-size:var(--font-size-caption);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);margin-bottom:10px}.qingxueAuthPanelWrap .authFormPanel .muted{font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-normal)}.qingxueAuthPanelWrap .authTabs{background:var(--brand-soft);border:1px solid #0f766e29;border-radius:8px;gap:0;margin-bottom:20px;padding:4px;display:flex;position:relative}.qingxueAuthPanelWrap .authTabs button{color:#475569;font-size:var(--font-size-control);font-weight:var(--font-weight-medium);line-height:var(--line-height-tight);z-index:1;background:0 0;border-radius:6px;min-height:40px;transition:color .18s,transform .18s;position:relative}.qingxueAuthPanelWrap .authTabs button.activeTab{box-shadow:none;color:var(--brand-deep);background:0 0}.authTabIndicator{background:#fff;border:1px solid #dbe4f0eb;border-radius:6px;width:calc(50% - 4px);height:calc(100% - 8px);transition:transform .26s cubic-bezier(.2,.85,.2,1);position:absolute;top:4px;left:4px;transform:translate(0);box-shadow:0 10px 24px #0f172a1a}.authTabs-register .authTabIndicator{transform:translate(100%)}.qingxueAuthPanelWrap .authFormStack{overflow:hidden}.authModeSurface{gap:14px;display:grid}.authLoginMethods{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.authLoginMethods button{color:#475569;cursor:pointer;font:inherit;font-size:var(--font-size-control);background:#f8fafc;border:1px solid #dbe4f0;border-radius:8px;min-height:38px}.authLoginMethods button.active{border-color:var(--brand);color:var(--brand);font-weight:var(--font-weight-bold);background:#e9f7f4}.authSmsRow{grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:10px;display:grid}.authSmsRow label{min-width:0}.authSmsRow button{white-space:nowrap;min-height:48px}.authTextButton{color:var(--brand);cursor:pointer;font:inherit;font-size:var(--font-size-control);background:0 0;border:0;justify-self:start;padding:0}@media (max-width:390px){.authSmsRow{grid-template-columns:1fr}}.authSlide-from-right{animation:.32s cubic-bezier(.2,.85,.2,1) both authModeFromRight}.authSlide-from-left{animation:.32s cubic-bezier(.2,.85,.2,1) both authModeFromLeft}.qingxueAuthPanelWrap .authFormStack label span{color:#475569;font-size:var(--font-size-control);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight)}.qingxueAuthPanelWrap .authFormStack input{font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-normal);background:#fff;border-color:#dbe4f0;min-height:48px;transition:border-color .16s,box-shadow .16s,outline-color .16s;box-shadow:0 1px #0f172a05}.qingxueAuthPanelWrap .authFormStack input:focus{border-color:var(--brand);outline:3px solid #0f766e1f;box-shadow:0 10px 24px #0f766e14}.qingxueAuthPanelWrap .authSubmitRow{gap:10px;margin-top:4px;display:grid}.qingxueAuthPanelWrap .authPrimaryButton{font-size:var(--font-size-control);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);min-height:48px;box-shadow:0 16px 32px #0f766e33}.qingxueAuthPanelWrap .authMessage{color:#475569;font-size:var(--font-size-meta);font-weight:var(--font-weight-regular);line-height:var(--line-height-normal);background:#f8fafc;border:1px solid #e2e8f0;border-radius:8px;padding:10px 12px;display:block}.eyebrow{color:var(--brand);font-size:var(--font-size-meta);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);margin:0 0 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