body.archive-shell-body{height:100vh;height:var(--vh,100vh);overflow:hidden;background:var(--page-bg);display:flex;flex-direction:column}svg.lucide-plus{width:var(--icon-sm);height:var(--icon-sm);flex-shrink:0;margin-top:-1px}svg.lucide-plus path{stroke-dasharray:14;stroke-dashoffset:14}svg.lucide-plus path:first-child{animation:tier-plus-draw var(--dur-med) var(--ease-out) .3s forwards}svg.lucide-plus path:last-child{animation:tier-plus-draw var(--dur-med) var(--ease-out) .1s forwards}@keyframes tier-plus-draw{from{stroke-dashoffset:14}to{stroke-dashoffset:0}}.profile-name{display:block;font-size:14px;font-weight:600;color:var(--ink-800);line-height:1.3}.profile-email{display:block;font-size:12px;color:var(--ink-400);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.profile-logout{color:var(--incorrect)}.profile-logout:hover{background:var(--incorrect-bg);color:var(--incorrect)}.profile-logout i,.profile-logout svg{color:var(--incorrect);stroke:var(--incorrect)}.shell{display:flex;flex:1;min-height:0;padding:var(--gap) var(--gap) var(--gap)}.left-col{flex:1;display:flex;flex-direction:column;min-width:0}.sidebar-wrap{width:0;flex-shrink:0;overflow:hidden;transition:width .4s var(--spring-bouncy),margin-right .4s var(--spring-bouncy);margin-right:0}.sidebar-wrap.open{width:355px;margin-right:var(--gap)}.sidebar-card{width:355px;height:100%;background:var(--card-bg);border-radius:var(--r-4xl);display:flex;flex-direction:column;overflow:hidden;border:var(--card-border)}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:28px 32px 0}.sidebar-title{font-size:var(--text-md);font-weight:700;color:var(--ink-800);letter-spacing:-.01em}.sidebar-close{width:28px;height:28px}.sidebar-close svg{width:14px;height:14px}.sidebar-body{padding:28px 32px 52px;overflow-y:auto;flex:1;display:flex;flex-direction:column;gap:24px;scrollbar-width:none}.sidebar-body::-webkit-scrollbar{display:none}.sidebar-intro{font-size:var(--text-md);color:var(--ink-500);line-height:var(--leading-relaxed);padding-bottom:4px}.sidebar-intro strong{color:var(--ink-700);font-weight:600}.tool-item{display:flex;flex-direction:column;gap:8px}.tool-item-header{display:flex;align-items:center;gap:8px}.tool-item-num{width:20px;height:20px;border-radius:50%;background:linear-gradient(135deg,#2d3140,#0c0d0f);color:var(--white);font-size:10px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:inset 4px 4px 8px rgba(255,255,255,.08)}.tool-item-title{font-family:var(--font-display);font-size:var(--text-base);font-weight:500;color:var(--ink-800);white-space:nowrap}.tool-item-line{flex:1;height:1px;background:var(--ink-200);min-width:12px}.tool-card{display:flex;border-radius:var(--r-lg);background:var(--surface-inset);text-decoration:none;color:inherit;position:relative;overflow:hidden;box-shadow:var(--shadow-border);transition:box-shadow .2s,transform .2s;cursor:pointer}@media (hover:hover) and (pointer:fine){.tool-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}}@media (hover:hover) and (pointer:fine){.tool-card:hover .tool-card-arrow{opacity:.5;transform:translate(0,0)}}.tool-card-img{width:40%;min-height:90px;background-size:cover;background-position:center;flex-shrink:0}.tool-card-content{flex:1;padding:14px 16px;display:flex;flex-direction:column;justify-content:center;min-width:0}.tool-card-desc{font-size:var(--text-base);color:var(--ink-500);line-height:var(--leading-normal)}.tool-card-compact{align-items:center;gap:12px;padding:14px 16px}.tool-card-compact .tool-card-icon{width:36px;height:36px;border-radius:var(--r-md);background:var(--ink-100);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .2s}.tool-card-compact .tool-card-icon i,.tool-card-compact .tool-card-icon svg{width:18px;height:18px;color:var(--ink-500);stroke:var(--ink-500);transition:color .2s,stroke .2s}@media (hover:hover) and (pointer:fine){.tool-card-compact:hover .tool-card-icon{background:var(--brand-soft)}}.tool-card-compact:hover .tool-card-icon i,@media (hover:hover) and (pointer:fine){}.tool-card-compact .tool-card-content{padding:0}.tool-card-arrow{position:absolute;top:8px;right:8px;opacity:0;transform:translate(-3px,3px);transition:opacity .15s,transform .2s}.tool-card-arrow svg{width:12px;height:12px;stroke:var(--ink-800);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}.main-card{flex:1;background:var(--card-bg);border-radius:var(--r-4xl);display:flex;flex-direction:column;overflow:hidden;min-height:0;position:relative;border:var(--card-border)}.main-scroll{flex:1;overflow-y:auto;overscroll-behavior:contain;padding:40px 48px 60px;scrollbar-width:thin;scrollbar-color:var(--ink-300) transparent}.main-scroll::-webkit-scrollbar{display:none}.main-scroll{scrollbar-width:none;-ms-overflow-style:none}.main-inner{max-width:1120px;margin:0 auto}.archive-subtitle,.archive-title,.search-note-section,.subjwrap{opacity:0}.hero-card{clip-path:inset(0 0 100% 0)}.section.scroll-reveal{opacity:0;transform:translateY(24px);transition:opacity .7s cubic-bezier(.16, 1, .3, 1),transform .7s cubic-bezier(.16, 1, .3, 1)}.section.scroll-reveal.revealed{opacity:1;transform:translateY(0)}.card.card-reveal{clip-path:inset(-48px -48px 100% -48px)}.card.card-reveal.card-revealed{clip-path:inset(-48px -48px -48px -48px);transition:clip-path .6s cubic-bezier(.16, 1, .3, 1)}.archive-header{margin-bottom:28px}.archive-title{font-family:var(--font-display);font-size:clamp(24px, 3vw, 32px);font-weight:600;color:var(--ink-900);letter-spacing:-.02em;line-height:1.15;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}.archive-title em{font-style:italic;color:var(--ink-400);font-weight:inherit}.archive-title-subject{color:var(--brand)}.archive-subtitle{margin-top:8px;font-size:var(--text-md);color:var(--ink-500);line-height:var(--leading-normal)}.subjwrap{display:flex;align-items:center;flex-wrap:wrap;row-gap:12px;column-gap:10px;margin-bottom:32px;min-height:46px}.subject-pill{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:var(--r-pill);background:var(--brand-soft);box-shadow:inset 0 0 0 1.5px rgba(0,114,255,.28),var(--shadow-ring);font-family:var(--font-sans);font-size:var(--text-base);font-weight:600;letter-spacing:-.01em;color:var(--brand);cursor:pointer;white-space:nowrap;transition:transform var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--smooth),background-color var(--dur-fast) var(--smooth),color var(--dur-fast) var(--smooth)}.subject-pill:active{transform:scale(.97)}.subject-pill.subjbtn{gap:10px;background:var(--white);color:var(--brand);box-shadow:var(--shadow-ring)}@media (hover:hover) and (pointer:fine){.subject-pill.subjbtn:hover{transform:translateY(-1px);box-shadow:var(--shadow-ring),0 6px 14px rgba(0,114,255,.12)}}.subjbtn-eyebrow{font-size:var(--text-xs);font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-500);padding-right:10px;border-right:1.5px solid var(--ink-200)}.subjbtn-label{font-weight:700;letter-spacing:-.01em;color:var(--brand)}.subjbtn-count{font-size:inherit;font-weight:600;color:var(--ink-400);letter-spacing:0;text-transform:none}.subjbtn-chev{width:10px;height:6px;flex-shrink:0;color:var(--ink-900);transition:transform var(--dur-morph) var(--spring)}.subjwrap.is-open .subjbtn-chev{transform:rotate(-90deg)}.subjrail,.subjrail-track{display:contents}.subjwrap:not(.is-rendered) .subjrail{display:none}.subjrail-track .subject-pill{flex:none;align-self:center}.subjrail-track .subject-pill{background:var(--white);color:var(--brand);box-shadow:none;border:none;outline:1.5px dashed rgba(0,114,255,.45);outline-offset:-1.5px;font-weight:600;opacity:0;transform:translateX(-28px) scale(.86);transition:opacity 160ms var(--smooth) calc((var(--n, 1) - var(--i, 0)) * 32ms),transform .3s var(--ease-out) calc((var(--n, 1) - var(--i, 0)) * 32ms)}.subjwrap.is-open .subjrail-track .subject-pill{opacity:1;transform:none;transition-delay:calc(var(--i, 0) * 42ms)}@media (hover:hover) and (pointer:fine){.subjrail-track .subject-pill:hover{background:var(--brand-soft);outline-color:var(--brand);transform:translateY(-1px)}}.subjrail-track .subject-pill:active{transform:scale(.96)}.subjrail-track .subject-pill.is-gated{color:var(--ink-400);outline-color:var(--ink-200);font-weight:500}.hero-section{margin-bottom:36px}.hero-scroll{--shadow-gutter:14px;--row-bleed:0px;position:relative}.hero-row{margin:0 calc(var(--shadow-gutter) * -1);display:flex;gap:15px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding:6px var(--shadow-gutter) 10px}.hero-row::-webkit-scrollbar{display:none}.hero-row>.hero-card{flex:1 0 260px;min-width:0}.hero-card{position:relative;display:flex;flex-direction:column;justify-content:flex-end;background:var(--ink-900);border-radius:var(--r-xl);padding:28px 24px;overflow:hidden;min-height:175px;cursor:pointer;text-decoration:none;color:inherit;transition:transform .3s var(--smooth),box-shadow .3s var(--smooth)}@media (hover:hover) and (pointer:fine){.hero-card:hover{transform:translateY(-3px)}}.mesh-bg{position:absolute;inset:0;width:100%;height:100%;z-index:0;border-radius:inherit;pointer-events:none}.hero-card-content{position:relative;z-index:1;transform:translateZ(0)}.hero-title{font-family:var(--font-sans);font-size:16px;font-weight:500;color:var(--white);margin-bottom:6px;letter-spacing:-.01em;line-height:1.25;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}#hero-question .hero-title{-webkit-line-clamp:2;max-height:2.5em;overflow:hidden}.hero-card .katex,.hero-card .katex .mbin,.hero-card .katex .mclose,.hero-card .katex .mopen,.hero-card .katex .mord,.hero-card .katex .mrel{color:inherit}.hero-desc{font-size:14px;color:rgba(255,255,255,.8);line-height:1.5;display:block;max-height:calc(2 * 1.5em);overflow:hidden}.hero-trend-row{display:block;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.hero-trend-row+.hero-trend-row{margin-top:3px}.hero-arrow{position:absolute;top:20px;right:20px;opacity:0;transform:translate(-4px,4px);transition:transform .25s var(--smooth),opacity .2s}.hero-arrow svg{width:14px;height:14px;stroke:rgba(255,255,255,.5);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}@media (hover:hover) and (pointer:fine){.hero-card:hover .hero-arrow{opacity:1;transform:translate(0,0)}}.search-note-section{text-align:left;padding:0;margin-bottom:-10px}.search-note-text{font-size:var(--text-md);color:var(--ink-500)}.search-note-link{background:0 0;border:none;padding:0;font-size:inherit;font-weight:600;color:var(--brand);cursor:pointer}.search-note-link:hover{text-decoration:underline}.card,.daily-fab,.hero-card,.rec-fab,.search-fab,.subject-pill,.tool-card,.trending-item,.widget-bubble{-webkit-tap-highlight-color:transparent;touch-action:manipulation}.course-promo-content .course-promo-body,.course-promo-content .course-promo-countdown,.course-promo-content .course-promo-title,.hero-card-content .hero-desc,.hero-card-content .hero-meta,.hero-card-content .hero-title,.pro-banner-content .pro-banner-body,.pro-banner-content .pro-banner-title{text-shadow:0 1px 2px rgba(0,0,0,.45),0 4px 16px rgba(0,0,0,.25)}.section{margin-bottom:36px}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.section-header-left{display:flex;align-items:center;gap:8px}.section-title{font-family:var(--font-sans);font-size:var(--text-lg);font-weight:600;color:var(--ink-800);letter-spacing:-.01em}@supports (background-clip:text) or (-webkit-background-clip:text){.section-title{color:transparent;background-clip:text;-webkit-background-clip:text;background-image:linear-gradient(135deg,var(--brand) 0,var(--ink-900) 78%);background-image:linear-gradient(135deg in oklab,var(--brand) 0,var(--ink-900) 78%)}}.section-subtitle{font-size:var(--text-md);color:var(--ink-400);margin:-11px 0 16px;line-height:var(--leading-normal)}.section-subtitle .subtitle-link{display:inline-flex;align-items:center;gap:4px;margin:0 6px 0 0;padding:3px 10px 3px 11px;border-radius:var(--r-pill);background:var(--brand-light);color:var(--brand);font-size:12px;font-weight:600;line-height:1;text-decoration:none;letter-spacing:-.005em;transition:background .18s var(--smooth),color .18s var(--smooth),transform .18s var(--smooth),box-shadow .18s var(--smooth)}.section-subtitle .subtitle-link svg{width:11px;height:11px;flex-shrink:0;transition:transform .2s var(--smooth)}.section-subtitle .subtitle-link:hover{background:var(--brand);color:#fff;box-shadow:0 4px 12px -4px rgba(0,114,255,.45)}.section-subtitle .subtitle-link:hover svg{transform:translate(1.5px,-1.5px)}.scroll-row{--row-bleed:48px;--shadow-gutter:14px;position:relative;margin:0 calc(var(--row-bleed) * -1);padding:0 calc(var(--row-bleed) - var(--shadow-gutter))}.scroll-track{display:flex;gap:15px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding:6px var(--shadow-gutter,14px) 30px;margin-bottom:-24px}.scroll-track::-webkit-scrollbar{display:none}.scroll-fade-left,.scroll-fade-right{position:absolute;top:0;bottom:6px;width:calc(48px + var(--shadow-gutter,0px));pointer-events:none;opacity:0;transition:opacity .25s;z-index:2}.scroll-fade-left{left:calc(var(--row-bleed) - var(--shadow-gutter,0px));background:linear-gradient(to right,var(--white),transparent)}.scroll-fade-right{right:calc(var(--row-bleed) - var(--shadow-gutter,0px));background:linear-gradient(to left,var(--white),transparent)}.scroll-fade-left.visible,.scroll-fade-right.visible{opacity:1}.expanded-grid{display:none;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:15px;padding:4px 0}.section.expanded .scroll-row{display:none}.section.expanded .expanded-grid{display:grid}.section.expanded{margin-bottom:40px}.card{background:var(--white);border:0;box-shadow:var(--shadow-card);border-radius:var(--r-xl);padding:22px 25px;display:flex;flex-direction:column;position:relative;overflow:hidden;cursor:pointer;text-decoration:none;color:inherit;transition:transform .25s var(--smooth),box-shadow .25s var(--smooth)}.scroll-track>.card{flex:0 0 260px}@media (hover:hover) and (pointer:fine){.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-card),0 8px 24px rgba(42,51,70,.1)}}.card-badges{display:flex;align-items:center;gap:5px;margin-bottom:10px;flex-wrap:wrap}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 8px;border-radius:var(--r-pill);font-size:var(--text-xs);font-weight:600;letter-spacing:.04em;text-transform:uppercase;white-space:nowrap}.badge-paid,.badge-pro-plus{background:linear-gradient(135deg,var(--tier-pro-plus-from),var(--tier-pro-plus-to));color:var(--white);font-weight:700;gap:3px}.badge i,.badge svg{width:13px;height:13px;stroke-width:2;flex-shrink:0}.badge-score{background:var(--badge-score-high-bg);color:var(--badge-score-high-text);font-weight:700;font-variant-numeric:tabular-nums}.badge-completed{background:var(--badge-completed-bg);color:var(--badge-completed-text)}.badge-in-progress{background:var(--badge-progress-bg);color:var(--badge-progress-text);gap:5px}.progress-ring{width:var(--icon-sm);height:var(--icon-sm);flex-shrink:0;transform:rotate(-90deg)}.progress-ring__bg{fill:none;stroke:var(--badge-progress-track);stroke-width:1.5}.progress-ring__fill{fill:none;stroke:var(--badge-progress-ring);stroke-width:1.5;stroke-linecap:round;stroke-dasharray:28.27;stroke-dashoffset:28.27}.badge-test{background:var(--badge-test-bg);color:var(--badge-test-text);position:relative;overflow:hidden}.badge-test::after{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent 0,var(--badge-test-shimmer) 45%,var(--badge-test-shimmer) 55%,transparent 100%);animation:badge-shimmer 3s ease-in-out infinite}@keyframes badge-shimmer{0%{left:-100%}40%{left:100%}100%{left:100%}}.badge-locked{background:var(--badge-locked-bg);color:var(--badge-locked-text)}.badge-mode-test{background:var(--badge-assigned-bg);color:var(--badge-assigned-text)}.badge-assigned{background:var(--badge-assigned-bg);color:var(--badge-assigned-text)}.card.card-locked{opacity:.7;cursor:default}@media (hover:hover) and (pointer:fine){.card.card-locked:hover{transform:none;box-shadow:none}}.card-title{font-family:var(--font-sans);font-size:var(--text-md);font-weight:500;line-height:var(--leading-tight);color:var(--ink-900);margin-bottom:8px;letter-spacing:-.01em;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-desc{font-size:var(--text-base);color:var(--ink-500);line-height:var(--leading-normal);margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-meta{display:flex;align-items:center;gap:8px;font-size:var(--text-sm);color:var(--ink-400);margin-top:auto;padding-top:6px}.meta-item{display:flex;align-items:center;gap:3px;white-space:nowrap}.meta-progress{color:var(--brand);font-weight:600}.card-arrow{position:absolute;top:20px;right:20px;opacity:0;transform:translate(-3px,3px);transition:transform .25s var(--smooth),opacity .2s;pointer-events:none}.card-arrow svg{width:14px;height:14px;stroke:var(--ink-900);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}@media (hover:hover) and (pointer:fine){.card:hover .card-arrow{opacity:.4;transform:translate(0,0)}}.hl{background:rgba(0,114,255,.1);border-radius:2px;padding:0 1px;color:var(--brand-dark)}.pro-banner{position:relative;background:var(--ink-900);border-radius:var(--r-xl);padding:28px 32px;margin-bottom:16px;overflow:hidden}.pro-banner-content{position:relative;z-index:1;transform:translateZ(0)}.pro-banner-badge{display:inline-flex;align-items:center;gap:2px;font-size:var(--text-xs);font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:4px 12px;border-radius:var(--r-pill);background:linear-gradient(135deg,var(--tier-pro-plus-from),var(--tier-pro-plus-to));color:var(--white);margin-bottom:14px}.pro-banner-badge i[data-lucide],.pro-banner-badge svg{width:13px;height:13px}.pro-banner-title{font-family:var(--font-display);font-size:19px;font-weight:500;color:var(--white);margin-bottom:8px;letter-spacing:-.01em}.pro-banner-body{font-size:15px;color:rgba(255,255,255,.82);line-height:1.6;max-width:560px}.pro-banner-cta{margin-top:14px;color:rgba(255,255,255,.65);font-weight:500}.pro-banner-cta.member{color:rgba(167,139,250,.8)}.pro-banner-cta-link{color:var(--white);text-decoration:none;font-weight:600;transition:opacity var(--dur-fast)}.pro-banner-cta-link:hover{opacity:.8}.welcome-modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:100000;display:flex;align-items:center;justify-content:center;padding:20px;opacity:0;transition:opacity .3s ease}.welcome-modal-card{background:#fff;border-radius:var(--r-lg);padding:36px 32px 32px;max-width:460px;width:90vw;text-align:center;box-shadow:0 16px 48px rgba(0,0,0,.2)}.wm-early-access{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:3px 10px;border-radius:var(--r-pill);background:rgba(0,156,118,.1);color:#009c76;margin-bottom:12px}.welcome-modal-title{font-family:var(--font-display);font-size:19px;font-weight:500;color:#111318;margin:0 0 12px}.wm-shimmer{display:inline-block;background-color:#111318;background-image:linear-gradient(120deg,transparent 0,transparent 30%,rgba(255,255,255,.8) 50%,transparent 70%,transparent 100%);background-position:-10rem top;background-repeat:no-repeat;background-size:8rem 100%;-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;animation:wm-shimmer 3s ease infinite;animation-delay:1s}@keyframes wm-shimmer{0%{background-position:-10rem top}60%{background-position:20rem top}100%{background-position:20rem top}}.welcome-modal-body{font-size:14px;color:#5a5f73;line-height:1.7;margin:0}.welcome-modal-divider{height:1px;background:#e8e8ea;margin:20px 0}.welcome-modal-paths{display:flex;flex-direction:column;gap:18px;text-align:left;margin-bottom:24px}.welcome-modal-path{display:flex;gap:14px;align-items:flex-start}.wm-path-icon{flex-shrink:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:#f4f4f6;border-radius:var(--r-md);color:#5a5f73}.wm-path-icon svg{width:18px;height:18px}.welcome-modal-path-label{font-size:14px;font-weight:600;color:#111318;margin:0 0 2px}.welcome-modal-path-desc{font-size:13px;color:#8a90a2;line-height:1.55;margin:0}.wm-inline-link{color:var(--brand);text-decoration:none;font-weight:500}.wm-inline-link:hover{text-decoration:underline}.welcome-modal-cta{display:inline-flex;align-items:center;gap:6px;padding:16px 32px;border:none;border-radius:var(--r-pill);font-family:inherit;font-size:15px;font-weight:600;cursor:pointer}.archive-disclaimer{font-size:11px;color:var(--ink-300);text-align:center;padding:32px 20px 8px;line-height:1.5;transition:opacity .5s ease}.course-promo-banner{position:relative;background:#050a08;border-radius:var(--r-xl);padding:32px 36px;margin-bottom:16px;overflow:hidden}.course-promo-content{position:relative;z-index:1;transform:translateZ(0)}.course-promo-header-row{display:flex;align-items:center;gap:12px;margin-bottom:14px}.course-promo-badge{display:inline-flex;align-items:center;gap:4px;font-size:var(--text-xs);font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:4px 14px;border-radius:var(--r-pill);background:linear-gradient(135deg,#009c76,#00c896);color:var(--white);flex-shrink:0}.course-promo-title{font-family:var(--font-display);font-size:19px;font-weight:500;color:var(--white);margin-bottom:10px;letter-spacing:-.01em}.course-promo-countdown{font-size:13px;font-weight:600;color:#00d99a}.course-promo-body{font-size:15px;color:rgba(255,255,255,.82);line-height:1.65;max-width:600px}.course-promo-cta{display:inline-flex;align-items:center;gap:6px;margin-top:18px;padding:14px 24px;background:#009c76;color:var(--white);border-radius:var(--r-pill);font-size:14px;font-weight:600;text-decoration:none;transition:background var(--dur-fast),transform var(--dur-fast)}@media (hover:hover) and (pointer:fine){.course-promo-cta:hover{background:#00b386;transform:translateY(-1px)}}.pricing-features li strong{display:inline}.trending-overlay{position:fixed;inset:0;z-index:1000;background:rgba(12,13,15,.5);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;padding:24px;opacity:0;pointer-events:none;transition:opacity .25s ease}.trending-overlay.open{opacity:1;pointer-events:auto}.trending-modal{background:var(--white);border-radius:var(--r-3xl);max-width:580px;width:100%;max-height:85vh;overflow:hidden;display:flex;flex-direction:column;padding:36px 0 0;position:relative;transform:translateY(12px) scale(.97);transition:transform .35s var(--spring-bouncy);box-shadow:0 24px 80px rgba(0,0,0,.18)}.trending-overlay.open .trending-modal{transform:translateY(0) scale(1)}.trending-modal-header{text-align:left;margin-bottom:24px;padding:0 32px;flex-shrink:0}#trending-modal-body{overflow-y:auto;min-height:0;flex:1;padding:0 32px 36px}.trending-modal-title{display:flex;align-items:center;gap:10px;font-family:var(--font-sans);font-size:22px;font-weight:700;color:var(--ink-900);letter-spacing:-.01em}.trending-modal-icon{width:24px;height:24px;color:var(--ink-600);flex-shrink:0}.trending-modal-subtitle{font-size:var(--text-base);color:var(--ink-400);margin-top:6px}.trending-modal-close{position:absolute;top:16px;right:16px}.trending-group{margin-bottom:28px}.trending-group:last-child{margin-bottom:0}.trending-group-label{font-family:var(--font-sans);font-size:var(--text-sm);font-weight:600;color:var(--ink-500);margin-bottom:10px}.trending-item{display:flex;align-items:flex-start;gap:14px;padding:9px 0;border-radius:var(--r-lg);text-decoration:none;color:inherit}.trending-item+.trending-item{margin-top:4px}.trending-item-rank{width:28px;height:28px;border-radius:var(--r-md);display:flex;align-items:center;justify-content:center;font-size:var(--text-sm);font-weight:700;flex-shrink:0;margin-top:2px;background:var(--ink-100);color:var(--ink-500)}.trending-item:first-of-type .trending-item-rank{background:var(--brand-soft);color:var(--brand)}.trending-item-body{flex:1;min-width:0}.trending-item-title{font-family:var(--font-prose);font-size:var(--text-md);color:var(--ink-800);line-height:var(--leading-tight);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.trending-item-meta{font-size:var(--text-sm);color:var(--ink-400);margin-top:4px}.trending-item-arrow{color:var(--ink-300);flex-shrink:0;margin-top:4px;opacity:0;transform:translateX(-4px);transition:opacity .15s,transform .2s var(--smooth)}.trending-item-arrow svg{width:14px;height:14px;stroke-width:2}@media (hover:hover) and (pointer:fine){.trending-item:hover .trending-item-arrow{opacity:1;transform:translateX(0)}}.trending-modal .katex{font-size:.9em}.card.card-pro{cursor:pointer}.card.card-pro .card-lock{display:flex;align-items:center;gap:4px;font-size:var(--text-xs);font-weight:600;color:var(--ink-400);margin-top:4px}.card.card-pro .card-lock i,.card.card-pro .card-lock svg{width:12px;height:12px;stroke-width:2.5}.skeleton-card{background:var(--ink-50);border:1.5px solid var(--ink-100);border-radius:var(--r-xl);padding:22px 25px;min-height:140px;animation:skeleton-pulse 1.5s ease-in-out infinite}.scroll-track>.skeleton-card{flex:0 0 260px}@keyframes skeleton-pulse{0%,100%{opacity:.5}50%{opacity:.8}}@media (max-width:768px){.top-bar-tier{display:none}.shell{padding:8px 8px 8px}.main-card{border-radius:var(--r-2xl)}.main-scroll{padding:28px 24px 48px}.scroll-row{--row-bleed:24px}.scroll-fade-left,.scroll-fade-right{width:24px}.sidebar-wrap{position:fixed;top:0;right:0;width:0;height:100dvh;z-index:100;margin-right:0;transition:width .35s var(--ease-out)}.sidebar-wrap.open{width:87vw;margin-right:0}.sidebar-card{width:87vw;border-radius:var(--r-2xl) 0 0 var(--r-2xl)}.sidebar-overlay{position:fixed;inset:0;background:rgba(0,0,0,.3);z-index:99;opacity:0;pointer-events:none;transition:opacity .3s}.sidebar-overlay.open{opacity:1;pointer-events:auto}.hero-row{gap:12px}.hero-card{padding:24px 20px;min-height:158px}.hero-title{font-size:14px}}@media (max-width:640px){.main-scroll{padding:24px 20px 40px}.scroll-row{--row-bleed:20px}.scroll-fade-left,.scroll-fade-right{width:20px}.scroll-track>.card{flex:0 0 200px}.expanded-grid{grid-template-columns:1fr 1fr;gap:12px}.card{padding:18px 20px;border-radius:var(--r-lg)}.card-title{font-size:15px}.archive-title{font-size:28px}.subject-pill{padding:10px 16px;font-size:13px}.hero-row{overflow-x:auto;scroll-snap-type:x mandatory;scroll-padding:0 16px;scrollbar-width:none;-webkit-overflow-scrolling:touch}.hero-row::-webkit-scrollbar{display:none}.hero-row>.hero-card{flex:0 0 86%;scroll-snap-align:center;min-height:132px}.hero-title{font-size:14px}.archive-title{font-size:24px;gap:8px}}@media (max-width:420px){.expanded-grid{grid-template-columns:1fr}.scroll-track>.card{flex:0 0 75vw}.scroll-track>.skeleton-card{flex:0 0 75vw}}.qsearch-overlay{position:fixed;inset:0;z-index:1000;background:rgba(12,13,15,.5);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;align-items:flex-start;justify-content:center;padding:12vh 24px 24px;opacity:0;pointer-events:none;transition:opacity .25s ease}.qsearch-overlay.open{opacity:1;pointer-events:auto}.qsearch-panel{position:relative;width:100%;max-width:620px;max-height:72vh;display:flex;flex-direction:column;background:var(--white);border-radius:var(--r-2xl);box-shadow:0 24px 80px rgba(0,0,0,.22);overflow:hidden;transform:translateY(12px) scale(.97);transition:transform .35s var(--spring-bouncy)}.qsearch-overlay.open .qsearch-panel{transform:translateY(0) scale(1)}.qsearch-inputwrap{display:flex;align-items:center;gap:12px;padding:18px 20px;border-bottom:1px solid var(--ink-100);flex-shrink:0}.qsearch-icon{width:20px;height:20px;color:var(--ink-400);flex-shrink:0;stroke-width:2.2}.qsearch-input{flex:1;min-width:0;border:0;outline:0;background:0 0;font-family:var(--font-sans);font-size:var(--text-lg);color:var(--ink-900)}.qsearch-input::placeholder{color:var(--ink-400)}.qsearch-input::-webkit-search-cancel-button{-webkit-appearance:none;display:none}.qsearch-esc{font-family:var(--font-sans);font-size:var(--text-xs);font-weight:600;color:var(--ink-500);background:var(--ink-100);border:0;padding:5px 8px;border-radius:var(--r-sm);cursor:pointer;flex-shrink:0;transition:background .15s,color .15s}.qsearch-esc:hover{background:var(--ink-200);color:var(--ink-800)}.qsearch-scope{font-family:var(--font-sans);font-size:var(--text-sm);color:var(--ink-500);padding:14px 22px 4px;flex-shrink:0;transition:opacity .18s ease}.qsearch-scope b{font-weight:600;color:var(--ink-700)}.qsearch-scope.is-hidden{opacity:0;height:0;padding-top:0;padding-bottom:0;overflow:hidden}.qsearch-results{overflow-y:auto;overscroll-behavior:contain;padding:6px 12px 12px;flex:1;min-height:0;--fade:24px;-webkit-mask-image:linear-gradient(to bottom,transparent 0,#000 var(--fade),#000 calc(100% - var(--fade)),transparent 100%);mask-image:linear-gradient(to bottom,transparent 0,#000 var(--fade),#000 calc(100% - var(--fade)),transparent 100%)}.qsearch-results.at-top{-webkit-mask-image:linear-gradient(to bottom,#000 calc(100% - var(--fade)),transparent 100%);mask-image:linear-gradient(to bottom,#000 calc(100% - var(--fade)),transparent 100%)}.qsearch-results.at-bottom{-webkit-mask-image:linear-gradient(to bottom,transparent 0,#000 var(--fade));mask-image:linear-gradient(to bottom,transparent 0,#000 var(--fade))}.qsearch-results.at-top.at-bottom{-webkit-mask-image:none;mask-image:none}.qsearch-row{display:flex;align-items:center;gap:12px;width:100%;padding:12px 14px;border:0;background:0 0;border-radius:var(--r-lg);text-align:left;text-decoration:none;color:var(--ink-800);cursor:pointer;transition:background-color .15s ease}.qsearch-row.is-active,.qsearch-row:hover{background:var(--ink-50)}.qsearch-row.is-active{box-shadow:inset 0 0 0 1.5px var(--brand-glow)}.qsearch-rowbody{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px}.qsearch-rowtext{font-family:var(--font-sans);font-size:var(--text-md);font-weight:500;color:var(--ink-900);line-height:var(--leading-tight)}.qsearch-rowtext mark{background:var(--brand-glow);color:inherit;border-radius:var(--r-xs);padding:0 1px}.qsearch-rowsub{font-family:var(--font-sans);font-size:var(--text-sm);color:var(--ink-400);display:flex;align-items:center;gap:6px;flex-wrap:wrap}.qsearch-match{font-family:var(--font-sans);font-size:var(--text-xs);font-weight:500;color:var(--brand);background:var(--brand-soft);padding:3px 7px;border-radius:var(--r-pill);white-space:nowrap}.qsearch-match mark{background:0 0;color:inherit;font-weight:700}.qsearch-match.is-desc{color:var(--ink-500);background:var(--ink-100);font-style:italic}.qsearch-rowarrow{width:15px;height:15px;color:var(--ink-300);flex-shrink:0}.qsearch-row.is-active .qsearch-rowarrow,.qsearch-row:hover .qsearch-rowarrow{color:var(--brand)}.qsearch-empty{padding:10px 22px 26px}.qsearch-empty-title{font-family:var(--font-display);font-size:var(--text-md);font-weight:500;color:var(--ink-800)}.qsearch-empty-body{font-family:var(--font-sans);font-size:var(--text-base);color:var(--ink-500);margin-top:6px}.qsearch-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 20px;border-top:1px solid var(--ink-100);background:var(--ink-50);flex-shrink:0}.qsearch-footer-note{font-family:var(--font-sans);font-size:var(--text-sm);color:var(--ink-500)}.qsearch-footer-link{display:inline-flex;align-items:center;gap:5px;font-family:var(--font-sans);font-size:var(--text-sm);font-weight:600;color:var(--brand);text-decoration:none;white-space:nowrap}.qsearch-footer-link svg{width:13px;height:13px}.qsearch-footer-link:hover{text-decoration:underline}.corner-stack{position:fixed;right:27px;bottom:calc(22px + env(safe-area-inset-bottom,0px));z-index:900;display:flex;flex-direction:column;align-items:flex-end;gap:12px}.search-fab{display:inline-flex;align-items:center;gap:0;height:52px;padding:0;width:52px;border-radius:var(--r-pill);border:0;background:var(--white);color:var(--ink-600);cursor:pointer;box-shadow:var(--shadow-ring),0 8px 22px rgba(12,13,15,.1);overflow:hidden;white-space:nowrap;transition:width var(--dur-morph) var(--ease-out),gap var(--dur-morph) var(--ease-out),padding var(--dur-morph) var(--ease-out),background-color var(--dur-fast) var(--smooth),color var(--dur-fast) var(--smooth),box-shadow var(--dur-fast) var(--smooth)}.search-fab-icon{width:22px;height:22px;flex-shrink:0;margin:0 15px;stroke-width:2.2;transition:margin var(--dur-morph) var(--ease-out)}.search-fab-label{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-sans);font-size:var(--text-base);font-weight:600;letter-spacing:-.01em;opacity:0;transform:translateX(-6px);transition:opacity var(--dur-fast) var(--smooth),transform var(--dur-morph) var(--ease-out)}@media (hover:hover) and (pointer:fine){.search-fab:hover{width:196px;padding-right:18px;background:var(--white);color:var(--ink-900);box-shadow:inset 0 0 0 1.5px rgba(0,114,255,.35),var(--shadow-ring),0 10px 26px rgba(0,114,255,.14)}.search-fab:hover .search-fab-icon{margin-right:10px}.search-fab:hover .search-fab-label{opacity:1;transform:none}}.search-fab:focus-visible{width:196px;padding-right:18px;background:var(--white);color:var(--ink-900);box-shadow:inset 0 0 0 1.5px rgba(0,114,255,.35),var(--shadow-ring),0 10px 26px rgba(0,114,255,.14)}.search-fab:focus-visible .search-fab-icon{margin-right:10px}.search-fab:focus-visible .search-fab-label{opacity:1;transform:none}.search-fab:active{transform:scale(.96)}@media (hover:none){.search-fab .search-fab-label{display:none}}.daily-fab,.rec-fab{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:var(--r-pill);border:0;background:var(--white);color:var(--ink-600);box-shadow:var(--shadow-ring),0 8px 22px rgba(12,13,15,.1);cursor:pointer;transition:transform var(--dur-fast) var(--ease-out),color var(--dur-fast) var(--smooth),box-shadow var(--dur-fast) var(--smooth)}.daily-fab svg,.rec-fab svg{width:26px;height:26px}@media (hover:hover) and (pointer:fine){.daily-fab:hover,.rec-fab:hover{transform:translateY(-2px);color:var(--ink-900)}}.daily-fab:active,.rec-fab:active{transform:scale(.94)}.quiz-widget{display:flex;flex-direction:column;align-items:flex-end}.widget-card{position:relative;width:296px;padding:22px 22px 20px;background:rgba(255,255,255,.92);backdrop-filter:saturate(200%) blur(24px);-webkit-backdrop-filter:saturate(200%) blur(24px);border-radius:var(--r-2xl);box-shadow:var(--shadow-ring),0 16px 40px rgba(12,13,15,.12);transform-origin:bottom right;animation:ubqWidgetIn var(--dur-med) var(--ease-out)}@keyframes ubqWidgetIn{from{opacity:0;transform:translateY(10px) scale(.92)}to{opacity:1;transform:translateY(0) scale(1)}}.widget-min{position:absolute;top:12px;right:12px;display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:var(--r-pill);border:0;background:0 0;color:var(--ink-400);cursor:pointer;transition:background-color var(--dur-fast) var(--smooth),color var(--dur-fast) var(--smooth)}.widget-min:hover{background:var(--ink-100);color:var(--ink-600)}.widget-min svg{width:11px;height:7px}.widget-title{font-family:var(--font-sans);font-size:var(--text-md);font-weight:600;letter-spacing:-.01em;color:var(--ink-900);padding-right:26px}.widget-body{font-family:var(--font-sans);font-size:var(--text-sm);color:var(--ink-500);line-height:1.55;margin:8px 0 16px}.widget-body .ubq-cap{font-weight:650;color:var(--ink-700)}.widget-cta{display:flex;align-items:center;justify-content:center;width:100%;padding:12px 20px;border-radius:var(--r-pill);background:var(--btn-gradient);color:var(--white);font-family:var(--font-sans);font-size:var(--text-base);font-weight:700;letter-spacing:-.01em;text-decoration:none;box-shadow:var(--btn-shadow);transition:transform var(--dur-fast) var(--ease-out),filter var(--dur-fast) var(--smooth)}.widget-cta:hover{filter:brightness(1.06)}.widget-cta:active{transform:scale(.98)}.widget-bubble{display:none;align-items:center;justify-content:center;width:52px;height:52px;border-radius:var(--r-pill);border:0;background:var(--btn-gradient);color:var(--white);cursor:pointer;box-shadow:var(--btn-shadow),0 10px 26px rgba(0,114,255,.28);transform-origin:bottom right;animation:ubqWidgetIn var(--dur-med) var(--ease-out);transition:transform var(--dur-fast) var(--ease-out),filter var(--dur-fast) var(--smooth)}.widget-bubble:hover{filter:brightness(1.07);transform:translateY(-2px)}.widget-bubble:active{transform:scale(.94)}.widget-bubble svg{width:24px;height:24px}.quiz-widget.is-mini .widget-card{display:none}.quiz-widget.is-mini .widget-bubble{display:inline-flex}@media (max-width:640px){.corner-stack{right:calc(19px + env(safe-area-inset-right,0px));bottom:calc(14px + env(safe-area-inset-bottom,0px));gap:10px}.search-fab{width:46px;height:46px}.search-fab .search-fab-icon{margin:0 12px;width:20px;height:20px}.daily-fab,.rec-fab,.widget-bubble{width:46px;height:46px}.widget-card{width:min(272px,calc(100vw - 28px));padding:18px 18px 16px}}.qsearch-note{font-family:var(--font-sans);font-size:var(--text-base);color:var(--ink-500);margin-top:14px;opacity:0}.qsearch-kbd{font-family:var(--font-sans);font-size:var(--text-xs);font-weight:600;line-height:1;color:var(--ink-500);background:var(--ink-100);padding:4px 6px;border-radius:var(--r-sm);white-space:nowrap}@media (max-width:640px){.qsearch-overlay{padding:6vh 14px 14px}.qsearch-panel{max-height:82vh}.qsearch-kbd{display:none}}@font-face{font-family:Kalam;src:url('../assets/font/Kalam/Kalam-Regular.ttf') format('truetype');font-weight:400;font-display:swap}@font-face{font-family:Kalam;src:url('../assets/font/Kalam/Kalam-Bold.ttf') format('truetype');font-weight:700;font-display:swap}:root{--brand:#0072ff;--brand-dark:#0057c8;--brand-light:#e6f0ff;--brand-mid:#3d91ff;--brand-glow:rgba(0, 114, 255, .18);--brand-soft:rgba(0, 114, 255, .08);--brand-press:#0053b9;--shadow-ring:0 2px 3px -1px rgba(0, 0, 0, .10),0 1px 0 0 rgba(25, 28, 33, .02),0 0 0 1px rgba(25, 28, 33, .08);--btn-gradient:linear-gradient(180deg, #4c9aff 0%, var(--brand) 45%, var(--brand-dark) 100%);--btn-edge:var(--brand-press);--btn-shadow:inset 0 -3px 0 var(--btn-edge),var(--shadow-ring);--ink-900:#0c0d0f;--ink-800:#1a1d24;--ink-700:#2d3140;--ink-600:#4a5068;--ink-500:#636b82;--ink-400:#8891a8;--ink-300:#b0b6c8;--ink-200:#d4d8e4;--ink-100:#eceef4;--ink-50:#fafafa;--white:#ffffff;--correct:#00a878;--correct-bg:#e6f7f2;--incorrect:#e8403c;--incorrect-bg:#fdf0ef;--warning:#f59e0b;--warning-bg:#fef8ec;--surface:var(--white);--surface-raised:var(--white);--surface-inset:var(--ink-50);--card:var(--white);--border:var(--ink-200);--border-mid:rgba(17, 19, 24, .12);--border-focus:var(--brand);--font-sans:'Google Sans Flex',system-ui,-apple-system,sans-serif;--font-display:'Unbounded','Google Sans Flex',system-ui,sans-serif;--font-prose:'Charter',Georgia,'Times New Roman',serif;--font-mono:'Fira Code',monospace;--font-hand:'Kalam','Caveat',cursive;--text-xs:10px;--text-sm:12px;--text-base:13px;--text-md:15px;--text-lg:17px;--text-xl:20px;--text-2xl:24px;--leading-tight:1.3;--leading-normal:1.55;--leading-relaxed:1.7;--r-xs:4px;--r-sm:6px;--r-md:10px;--r-lg:14px;--r-xl:20px;--r-2xl:28px;--r-3xl:32px;--r-4xl:50px;--r-pill:999px;--spring:cubic-bezier(.34, 1.56, .64, 1);--smooth:cubic-bezier(.25, .46, .45, .94);--ease-out:cubic-bezier(.16, 1, .3, 1);--ease-in:cubic-bezier(.4, 0, 1, 1);--dur-fast:150ms;--dur-med:280ms;--dur-morph:320ms;--dur-slow:420ms;--shadow-sm:0 1px 3px rgba(12, 13, 15, .06),0 1px 2px rgba(12, 13, 15, .04);--shadow-md:0 4px 16px rgba(12, 13, 15, .08),0 2px 4px rgba(12, 13, 15, .04);--shadow-lg:0 12px 40px rgba(12, 13, 15, .12),0 4px 8px rgba(12, 13, 15, .06);--shadow-border:rgba(9, 30, 66, 0.25) 0px 1px 1px,rgba(9, 30, 66, 0.13) 0px 0px 1px 1px;--shadow-card:rgba(14, 63, 126, 0.06) 0px 0px 0px 1px,rgba(42, 51, 70, 0.03) 0px 1px 1px -0.5px,rgba(42, 51, 70, 0.04) 0px 2px 2px -1px,rgba(42, 51, 70, 0.04) 0px 3px 3px -1.5px,rgba(42, 51, 70, 0.03) 0px 5px 5px -2.5px,rgba(42, 51, 70, 0.03) 0px 10px 10px -5px,rgba(42, 51, 70, 0.03) 0px 24px 24px -8px;--page-bg:#e8e8ec;--card-bg:var(--white);--card-border:0.5px solid rgba(0, 0, 0, .08);--gap:12px;--chat-w:380px;--spring-linear:linear(0 0%, 0.2688 9.91%, 0.3859 15%, 0.4917 20.19%, 0.5865 25.5%, 0.6705 30.93%, 0.7441 36.51%, 0.8075 42.26%, 0.8593 47.98%, 0.9022 53.93%, 0.9366 60.13%, 0.963 66.67%, 0.9812 73.4%, 0.9929 80.76%, 0.9986 88.89%, 1 100%);--spring-bouncy:linear(0 0%, 0.5571 7.53%, 0.8252 11.98%, 0.9337 14.38%, 1.0166 16.8%, 1.0765 19.31%, 1.1146 21.97%, 1.1263 23.47%, 1.1325 25.06%, 1.133 26.76%, 1.128 28.62%, 1.1094 31.9%, 1.0484 39.77%, 1.0218 43.85%, 1.0011 48.42%, 0.9895 53.23%, 0.9861 59.8%, 1 81.27% 100%);--max-w:780px;--progress-h:3px;--icon-xs:10px;--icon-sm:12px;--icon-md:16px;--icon-lg:20px;--tier-lite-bg:var(--ink-200);--tier-lite-text:var(--ink-600);--tier-pro-from:#0a1628;--tier-pro-to:#0a3d8f;--tier-pro-plus-from:#1a0a3d;--tier-pro-plus-to:#4a1a8f;--tier-educator-from:#0c0d0f;--tier-educator-to:#1a6b3d;--badge-test-bg:rgba(194, 65, 12, .08);--badge-test-text:#c2410c;--badge-test-shimmer:rgba(194, 65, 12, .15);--badge-progress-bg:rgba(180, 83, 9, .08);--badge-progress-text:#92400e;--badge-progress-ring:#b45309;--badge-progress-track:rgba(180, 83, 9, .15);--badge-completed-bg:rgba(0, 168, 120, .1);--badge-completed-text:#047857;--badge-assigned-bg:var(--brand-soft);--badge-assigned-text:var(--brand);--badge-locked-bg:var(--ink-100);--badge-locked-text:var(--ink-500);--badge-score-high-bg:rgba(0, 168, 120, .1);--badge-score-high-text:#047857;--badge-score-mid-bg:#fef8ec;--badge-score-mid-text:#b45309;--badge-score-low-bg:rgba(232, 64, 60, .08);--badge-score-low-text:#dc2626}*,::after,::before{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased}body{font-family:var(--font-sans);background:var(--ink-50);color:var(--ink-800);min-height:100vh;line-height:1.6}img{max-width:100%;height:auto;display:block;border-radius:var(--r-md)}button{font-family:inherit;cursor:pointer;border:none;background:0 0}input,textarea{font-family:inherit}.explanation-body,.frq-question-text,.option-text,.question-html{font-family:var(--font-prose)}@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes cardIn{from{opacity:0;transform:translateY(16px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}@media (prefers-reduced-motion:reduce){*,::after,::before{animation-duration:NaNs!important;transition-duration:NaNs!important}}@supports (corner-shape:squircle){:root{--r-xs:9px;--r-sm:13px;--r-md:22px;--r-lg:31px;--r-xl:44px;--r-2xl:62px;--r-3xl:70px;--r-4xl:110px}}*,::after,::before{corner-shape:squircle}.gq-spinner,.loader,.mini-loader,.portal-spinner{corner-shape:round}#trending-modal-body,.feature-gate-email-body,.grading-scroll,.pricing-scroll,.qsearch-results,.settings-panel-body,.sidebar-body,.stats-panel-body,.ubq-form-body,.welcome-content,.welcome-modal-card{scrollbar-width:none;-ms-overflow-style:none}#trending-modal-body::-webkit-scrollbar,.feature-gate-email-body::-webkit-scrollbar,.grading-scroll::-webkit-scrollbar,.pricing-scroll::-webkit-scrollbar,.qsearch-results::-webkit-scrollbar,.settings-panel-body::-webkit-scrollbar,.sidebar-body::-webkit-scrollbar,.stats-panel-body::-webkit-scrollbar,.ubq-form-body::-webkit-scrollbar,.welcome-content::-webkit-scrollbar,.welcome-modal-card::-webkit-scrollbar{display:none}[data-rtip-title]{text-decoration:underline dotted var(--ink-300);text-underline-offset:3px;cursor:help}.rtip{position:fixed;z-index:10000;display:none;max-width:280px;background:var(--ink-900);color:var(--white);padding:12px 14px;border-radius:var(--r-lg);box-shadow:0 12px 32px rgba(12,13,15,.28);font-family:var(--font-sans)}.rtip-title{font-size:var(--text-sm);font-weight:700;margin-bottom:4px}.rtip-body{font-size:var(--text-sm);font-weight:400;line-height:1.45;color:var(--ink-200)}.rtip-link{display:inline-flex;align-items:center;gap:5px;margin-top:8px;font-size:var(--text-sm);font-weight:600;color:var(--brand-mid);text-decoration:none}.rtip-link:hover{text-decoration:underline}.rtip-link svg{width:12px;height:12px}