body.archive-shell-body{height:100vh;overflow:hidden;background:var(--page-bg);display:flex;flex-direction:column}.top-bar{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;margin:0 var(--gap);background:var(--card-bg);border-radius:0 0 35px 35px;flex-shrink:0;border:var(--card-border);border-top:none}.top-bar-left{display:flex;align-items:center;gap:12px}.top-bar-logo{display:flex;align-items:center;text-decoration:none;flex-shrink:0}.top-bar-logo-img{width:24px;height:24px;border-radius:0}.top-bar-title{font-size:var(--text-md);font-weight:700;color:var(--ink-800);letter-spacing:-.01em}.top-bar-title-accent{font-weight:400;color:var(--ink-400)}.top-bar-role{font-size:var(--text-xs);font-weight:600;letter-spacing:.05em;text-transform:uppercase;padding:3px 10px;border-radius:var(--r-pill);background:var(--ink-100);color:var(--ink-500);white-space:nowrap}.top-bar-tier{display:inline-flex;align-items:center;gap:2px;font-size:var(--text-xs);font-weight:700;letter-spacing:.05em;text-transform:uppercase;padding:3px 10px;border-radius:var(--r-pill);white-space:nowrap;opacity:0;transition:opacity var(--dur-fast) var(--smooth)}.top-bar-tier.tier-ready{opacity:1}.top-bar-tier.lite{background:var(--tier-lite-bg);color:var(--tier-lite-text)}.top-bar-tier.pro{background:linear-gradient(135deg,var(--tier-pro-from),var(--tier-pro-to));color:var(--white)}.top-bar-tier.pro-plus{background:linear-gradient(135deg,var(--tier-pro-plus-from),var(--tier-pro-plus-to));color:var(--white)}.top-bar-tier.educator{background:linear-gradient(135deg,var(--tier-educator-from),var(--tier-educator-to));color:var(--white)}svg.lucide-plus{width:var(--icon-sm);height:var(--icon-sm);flex-shrink:0}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}}.top-bar-right{display:flex;align-items:center;gap:4px}.top-bar-avatar{width:32px;height:32px;border-radius:50%;background:var(--ink-200);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;color:var(--ink-500);cursor:pointer;overflow:hidden;position:relative}.top-bar-avatar-img{width:100%;height:100%;object-fit:cover;border-radius:0}.top-bar-avatar-initials{line-height:1}.avatar-wrap{position:relative}.profile-dropdown{position:absolute;top:calc(100% + 8px);right:0;width:240px;background:var(--white);border:1px solid var(--ink-200);border-radius:var(--r-xl);box-shadow:var(--shadow-lg);padding:8px;z-index:100;opacity:0;pointer-events:none;transform:translateY(-6px) scale(.97);transform-origin:top right;transition:opacity .2s var(--smooth),transform .25s var(--spring-bouncy)}.profile-dropdown.open{opacity:1;pointer-events:auto;transform:translateY(0) scale(1)}.profile-dropdown-header{padding:10px 12px 8px}.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-dropdown-divider{height:1px;background:var(--ink-100);margin:4px 8px}.profile-dropdown-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--r-md);font-size:13px;font-weight:500;color:var(--ink-600);text-decoration:none;cursor:pointer;transition:background .15s,color .15s}.profile-dropdown-item:hover{background:var(--ink-50);color:var(--ink-800)}.profile-dropdown-item i,.profile-dropdown-item svg{width:15px;height:15px;stroke-width:2;color:var(--ink-400);flex-shrink:0}.profile-dropdown-item:hover i,.profile-dropdown-item:hover svg{color:var(--ink-600)}.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)}.educator-btn{font-size:12px;font-weight:600;color:var(--brand);background:rgba(0,114,255,.08);border:1px solid rgba(0,114,255,.18);border-radius:var(--r-pill);padding:6px 16px;cursor:pointer;letter-spacing:.02em;white-space:nowrap;transition:background var(--dur-fast)}.educator-btn:hover{background:rgba(0,114,255,.14)}.login-btn{font-family:inherit;font-size:13px;font-weight:600;color:var(--white);background:var(--ink-900);border:none;border-radius:var(--r-pill);padding:8px 20px;cursor:pointer;white-space:nowrap;transition:background var(--dur-fast)}.login-btn:hover{background:#2a2d35}.icon-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:var(--r-pill);border:none;background:0 0;color:var(--ink-400);cursor:pointer;text-decoration:none;flex-shrink:0;transition:background var(--dur-fast),color var(--dur-fast)}.icon-btn:hover{background:var(--ink-100);color:var(--ink-700)}.icon-btn.active{background:rgba(0,114,255,.08);color:var(--brand)}.icon-btn svg{width:18px;height:18px;stroke-width:2.2}.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:50px;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}.sidebar-toggle-btn{font-family:var(--font-sans);font-size:var(--text-sm);font-weight:600;color:var(--ink-600);padding:6px 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.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}.tool-card-compact:hover .tool-card-icon{background:var(--brand-soft)}.tool-card-compact:hover .tool-card-icon i,.tool-card-compact:hover .tool-card-icon svg{color:var(--brand);stroke:var(--brand)}.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:50px;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,.subject-chip{opacity:0}.hero-card{clip-path:inset(0 0 100% 0)}.section.scroll-reveal{opacity:0;transform:translateY(24px);transition:opacity 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var(--smooth);white-space:nowrap;position:relative}.subject-chip:hover:not(.active):not(.disabled){border-color:var(--ink-300);color:var(--ink-800);background:var(--ink-50)}.subject-chip.active{background:var(--brand);color:var(--white);border-color:var(--brand)}.subject-chip.active .subject-chip-dot{background:var(--white)}.subject-chip.disabled{cursor:pointer}.subject-chip-dot{width:6px;height:6px;border-radius:50%;background:var(--brand);flex-shrink:0}.subject-chip.disabled .subject-chip-dot{display:none}.subject-chip-soon{font-size:9px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;padding:2px 6px;border-radius:var(--r-pill);background:var(--ink-100);color:var(--ink-400);margin-left:2px}.hero-section{margin-bottom:36px}.hero-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}.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:200px;cursor:pointer;text-decoration:none;color:inherit;transition:transform .3s var(--smooth),box-shadow .3s var(--smooth)}.hero-card:hover{transform:translateY(-3px);box-shadow:0 12px 40px rgba(0,0,0,.25)}.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}.hero-label{display:inline-flex;align-items:center;gap:6px;font-size:9px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:4px 12px;border-radius:var(--r-pill);background:rgba(255,255,255,.1);color:rgba(255,255,255,.7);margin-bottom:14px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}.hero-title{font-family:var(--font-prose);font-size:19px;font-weight:400;font-style:italic;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{color:var(--white)}.hero-card .katex .mbin,.hero-card .katex .mclose,.hero-card .katex .mopen,.hero-card .katex .mord,.hero-card .katex .mrel{color:var(--white)}.hero-desc{font-size:13px;color:rgba(255,255,255,.4);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.hero-meta{display:flex;align-items:center;gap:10px;margin-top:14px;font-size:11px;color:rgba(255,255,255,.3)}.hero-meta .meta-item{display:flex;align-items:center;gap:4px}.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}.hero-card:hover .hero-arrow{opacity:1;transform:translate(0,0)}.hero-card-cta{cursor:default}.hero-card-cta:hover{transform:none;box-shadow:none}.hero-see-more{text-align:right;margin-top:10px}.hero-see-more-btn{font-size:var(--text-base);font-weight:500;color:var(--ink-400);cursor:pointer;transition:color .15s}.hero-see-more-btn:hover{color:var(--brand)}.hero-cta-btn{display:inline-flex;align-items:center;gap:6px;margin-top:16px;padding:9px 22px;border-radius:var(--r-pill);border:1.5px solid rgba(255,255,255,.25);background:rgba(255,255,255,.08);color:var(--white);font-size:13px;font-weight:600;cursor:pointer;transition:background .2s,border-color .2s;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}.hero-cta-btn:hover{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.4)}.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-prose);font-size:var(--text-xl);font-weight:400;font-style:italic;color:var(--ink-800);letter-spacing:-.01em}.section-count{font-size:var(--text-sm);color:var(--ink-400);font-weight:500;padding:2px 8px;background:var(--ink-100);border-radius:var(--r-pill)}.section-subtitle{font-size:var(--text-md);color:var(--ink-400);margin:-6px 0 16px;line-height:var(--leading-normal)}.section-toggle{display:inline-flex;align-items:center;gap:4px;padding:5px 12px;border-radius:var(--r-pill);border:1px solid var(--ink-200);background:var(--white);font-size:11px;font-weight:500;color:var(--ink-500);cursor:pointer;transition:all .15s var(--smooth)}.section-toggle:hover{border-color:var(--ink-300);color:var(--ink-700);background:var(--ink-50)}.section-toggle i,.section-toggle svg{width:13px;height:13px;stroke-width:2.5;transition:transform .25s var(--spring-bouncy)}.section.expanded .section-toggle i,.section.expanded .section-toggle svg{transform:rotate(90deg)}.scroll-row{position:relative;margin:0 -48px;padding:0 48px}.scroll-track{display:flex;gap:10px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding:4px 0 6px}.scroll-track::-webkit-scrollbar{display:none}.scroll-fade-left,.scroll-fade-right{position:absolute;top:0;bottom:6px;width:48px;pointer-events:none;opacity:0;transition:opacity .25s;z-index:2}.scroll-fade-left{left:0;background:linear-gradient(to right,var(--white),transparent)}.scroll-fade-right{right:0;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:10px;padding:4px 0}.section.expanded .scroll-row{display:none}.section.expanded .expanded-grid{display:grid}.section.expanded{margin-bottom:40px}.explore-more-wrap{display:flex;justify-content:center;margin-top:20px}.explore-more-btn{padding:10px 32px;border-radius:var(--r-pill);border:1.5px solid var(--ink-200);background:var(--white);font-size:var(--text-base);font-weight:500;color:var(--ink-600);cursor:pointer;transition:all .2s var(--smooth)}.explore-more-btn:hover{border-color:var(--ink-300);color:var(--ink-800);background:var(--ink-50)}.card{background:var(--white);border:1.5px solid var(--ink-200);border-radius:var(--r-xl);padding:22px 20px;display:flex;flex-direction:column;position:relative;overflow:hidden;cursor:pointer;text-decoration:none;color:inherit;transition:transform .25s var(--smooth),border-color .2s,box-shadow .25s}.scroll-track>.card{flex:0 0 260px}.card:hover{transform:translateY(-2px);border-color:var(--ink-300);box-shadow:0 4px 16px rgba(12,13,15,.06)}.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 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circle{fill:none;stroke:#fff;stroke-width:1.5;stroke-dasharray:50;stroke-dashoffset:50;transition:stroke-dashoffset 1.2s ease .2s}.welcome-checkout-pill.show circle{stroke-dashoffset:0}.welcome-checkout-pill polyline{fill:none;stroke:#fff;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:20;stroke-dashoffset:20;transition:stroke-dashoffset .6s ease 1.2s}.welcome-checkout-pill.show polyline{stroke-dashoffset:0}.welcome-checkout-pill span{font-size:15px;font-weight:500;color:rgba(255,255,255,.9)}.welcome-checkout-progress{width:min(320px,70vw);height:4px;background:rgba(255,255,255,.08);border-radius:6px;margin:32px auto 22px;overflow:hidden;opacity:0;transition:opacity .6s ease}.welcome-checkout-progress.show{opacity:1}.welcome-checkout-progress-fill{height:100%;width:0%;background:rgba(255,255,255,.7);border-radius:6px;transition:width .5s ease}.welcome-checkout-status{font-family:var(--font-sans, system-ui, sans-serif);font-size:14px;font-weight:500;color:rgba(255,255,255,.4);height:20px;opacity:0;transition:opacity .6s ease;position:relative}.welcome-checkout-status.show{opacity:1}.welcome-checkout-status span{position:absolute;width:100%;left:0;text-align:center;opacity:0;transform:translateY(8px);transition:opacity .5s ease,transform .5s ease}.welcome-checkout-status span.active{opacity:1;transform:translateY(0)}.welcome-checkout-status span.exit{opacity:0;transform:translateY(-8px)}.welcome-checkout-confirmed{opacity:0;transform:translateY(14px) scale(.97);transition:opacity .7s ease,transform .7s cubic-bezier(.22, 1, .36, 1);position:absolute;width:100%;left:0;top:0;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px}.welcome-checkout-confirmed.show{opacity:1;transform:translateY(0) scale(1)}.welcome-checkout-countdown{font-family:var(--font-prose, 'Charter', serif);font-size:clamp(36px, 8vw, 52px);letter-spacing:-.02em;color:#fff;margin-top:16px;opacity:0;transform:translateY(6px);transition:opacity .5s ease,transform .5s ease;position:relative;height:1.4em}.welcome-checkout-countdown.show{opacity:1;transform:translateY(0)}.countdown-num-wrap{display:inline-block;position:relative;width:.65em;height:1.2em;vertical-align:bottom;overflow:hidden}.countdown-num{display:block;position:absolute;width:100%;text-align:center;left:0;bottom:0;transition:transform .45s cubic-bezier(.22, 1, .36, 1),opacity .45s ease}.countdown-num.current{transform:translateY(0);opacity:1}.countdown-num.exit-up{transform:translateY(-110%);opacity:0}.countdown-num.enter-below{transform:translateY(110%);opacity:0}.welcome-checkout-timeout{display:none;margin-top:28px;font-size:13px;color:rgba(255,255,255,.45);line-height:1.6;background:rgba(255,255,255,.05);border:.5px solid rgba(255,255,255,.08);border-radius:16px;padding:20px 24px;pointer-events:auto}.welcome-checkout-timeout a{color:rgba(255,255,255,.7);text-decoration:underline;text-decoration-color:rgba(255,255,255,0.3);user-select:all}.welcome-checkout-hint{position:fixed;bottom:28px;left:0;right:0;text-align:center;font-size:clamp(11px, 2.5vw, 13px);color:var(--ink-400);opacity:0;transform:translateY(6px);transition:opacity .8s ease,transform .8s ease;font-style:italic;z-index:2}.welcome-checkout-hint.show{opacity:1;transform:translateY(0)}@media (max-width:640px){.welcome-checkout-card{width:94vw;padding:64px 24px 52px;border-radius:20px;min-height:380px}.welcome-checkout-pill{padding:10px 20px 10px 14px;gap:10px;margin-bottom:28px}.welcome-checkout-pill span{font-size:13px}.welcome-checkout-pill svg{width:24px;height:24px}.welcome-checkout-confirmed{padding:32px 20px}.welcome-checkout-status{font-size:13px}}