:root{--bg:#fafafa;--bg-subtle:#f4f4f5;--surface:#fff;--surface-hover:#f8f8fa;--text:#09090b;--text-2:#3f3f46;--muted:#71717a;--border:#e4e4e7;--border-strong:#d4d4d8;--accent:#4f46e5;--accent-hover:#4338ca;--accent-soft:#eef2ff;--accent-text:#fff;--gradient:linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);--success:#059669;--success-soft:#ecfdf5;--warning:#b45309;--warning-soft:#fffbeb;--danger:#e11d48;--danger-soft:#fff1f2;--tone-0:#6366f1;--tone-1:#0ea5e9;--tone-2:#10b981;--tone-3:#f59e0b;--tone-4:#ec4899;--tone-5:#8b5cf6;--tone-6:#14b8a6;--radius-sm:8px;--radius:12px;--radius-lg:16px;--shadow-sm:0 1px 2px #0000000a;--shadow:0 1px 3px #0000000f, 0 8px 24px -12px #0000001f;--shadow-lg:0 24px 64px -16px #00000040;--ring:0 0 0 3px #6366f14d;--header-bg:#fafafabf;--grid-line:#09090b0d;--font-mono:"JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;--code-bg:#f6f8fa;--code-head:#eef1f4;--code-text:#1f2328;--code-keyword:#cf222e;--code-string:#0a3069;--code-comment:#6e7781;--code-number:#0550ae;--code-title:#8250df;--code-type:#953800;--code-meta:#116329;font-feature-settings:"cv11", "ss01";color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.55}@media (prefers-color-scheme:dark){:root{--bg:#09090b;--bg-subtle:#111114;--surface:#111114;--surface-hover:#18181c;--text:#fafafa;--text-2:#d4d4d8;--muted:#a1a1aa;--border:#27272a;--border-strong:#3f3f46;--accent:#818cf8;--accent-hover:#a5b4fc;--accent-soft:#6366f124;--accent-text:#09090b;--success:#34d399;--success-soft:#10b98124;--warning:#fbbf24;--warning-soft:#f59e0b24;--danger:#fb7185;--danger-soft:#f43f5e24;--shadow:0 1px 2px #0006, 0 8px 24px -12px #0009;--header-bg:#09090bb3;--grid-line:#ffffff0d;--code-bg:#0d1117;--code-head:#161b22;--code-text:#e6edf3;--code-keyword:#ff7b72;--code-string:#a5d6ff;--code-comment:#8b949e;--code-number:#79c0ff;--code-title:#d2a8ff;--code-type:#ffa657;--code-meta:#7ee787}}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:80px}body{background:var(--bg);min-height:100vh;margin:0}#root{flex-direction:column;min-height:100vh;display:flex}main{flex:1}h1,h2,h3{letter-spacing:-.02em;margin:0;line-height:1.2}p{margin:0}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit;color:inherit}button{cursor:pointer}:focus-visible{box-shadow:var(--ring);outline:none}.muted{color:var(--muted)}[hidden]{display:none!important}.sr-only{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.container{width:100%;max-width:1120px;margin:0 auto;padding:0 24px}.section{padding-top:40px;padding-bottom:64px}.button{white-space:nowrap;border:1px solid #0000;border-radius:10px;justify-content:center;align-items:center;gap:8px;height:40px;padding:0 16px;font-size:.925rem;font-weight:600;transition:background .15s,border-color .15s,transform .15s,box-shadow .15s;display:inline-flex}.button:disabled{opacity:.55;cursor:default}.button:active:not(:disabled){transform:translateY(1px)}.button-sm{height:34px;padding:0 14px;font-size:.875rem}.button-lg{border-radius:12px;height:48px;padding:0 22px;font-size:1rem}.button-primary{background:var(--text);color:var(--bg);box-shadow:var(--shadow-sm)}.button-primary:hover:not(:disabled){background:var(--text-2)}.button-secondary{background:var(--surface);border-color:var(--border);box-shadow:var(--shadow-sm)}.button-secondary:hover:not(:disabled){background:var(--surface-hover);border-color:var(--border-strong)}.button-ghost{border-color:var(--border);background:0 0}.button-ghost:hover{background:var(--surface)}.icon-button{border:1px solid var(--border);background:var(--surface);width:36px;height:36px;color:var(--text-2);border-radius:10px;place-items:center;padding:0;transition:background .15s,border-color .15s;display:inline-grid}.icon-button:hover{background:var(--surface-hover);border-color:var(--border-strong)}.icon-button.is-disabled{opacity:.4}.chip{white-space:nowrap;border-radius:999px;align-items:center;gap:4px;padding:2px 8px;font-size:.75rem;font-weight:600;display:inline-flex}.chip-success{background:var(--success-soft);color:var(--success)}.chip-accent{background:var(--accent-soft);color:var(--accent);text-transform:uppercase;letter-spacing:.04em;font-size:.675rem}.difficulty{white-space:nowrap;border-radius:999px;align-items:center;gap:6px;padding:3px 10px;font-size:.75rem;font-weight:600;display:inline-flex}.difficulty:before{content:"";background:currentColor;border-radius:50%;width:6px;height:6px}.difficulty-easy{background:var(--success-soft);color:var(--success)}.difficulty-medium{background:var(--warning-soft);color:var(--warning)}.difficulty-hard{background:var(--danger-soft);color:var(--danger)}.count{color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap;font-size:.875rem;font-weight:500}.progress{background:var(--bg-subtle);border-radius:999px;flex:1;min-width:60px;height:6px;overflow:hidden}.progress span{border-radius:inherit;background:var(--gradient);height:100%;transition:width .4s;display:block}.header{z-index:10;border-bottom:1px solid var(--border);background:var(--header-bg);-webkit-backdrop-filter:saturate(180%)blur(12px);backdrop-filter:saturate(180%)blur(12px);position:sticky;top:0}.header-inner{align-items:center;gap:32px;height:64px;display:flex}.brand{letter-spacing:-.02em;align-items:center;gap:10px;font-weight:700;display:inline-flex}.brand-mark{background:var(--gradient);color:#fff;border-radius:8px;place-items:center;width:28px;height:28px;display:grid}.header-nav{color:var(--muted);gap:24px;font-size:.925rem;display:flex}.header-nav a:hover{color:var(--text)}.header-actions{align-items:center;gap:12px;margin-left:auto;display:flex}.lang-switch{border:1px solid var(--border);background:var(--surface);border-radius:999px;padding:3px;display:inline-flex}.lang-switch button{min-width:36px;color:var(--muted);letter-spacing:.04em;background:0 0;border:none;border-radius:999px;padding:3px 9px;font-size:.75rem;font-weight:700;transition:background .15s,color .15s}.lang-switch button:hover{color:var(--text)}.lang-switch button.is-active{background:var(--text);color:var(--bg)}.user-menu{position:relative}.user-button{border:1px solid var(--border);background:var(--surface);border-radius:999px;align-items:center;gap:10px;padding:4px 12px 4px 4px;font-size:.9rem;font-weight:500;display:flex}.user-button:hover{border-color:var(--border-strong)}.user-name{text-overflow:ellipsis;white-space:nowrap;max-width:160px;overflow:hidden}.avatar{object-fit:cover;border-radius:50%;flex-shrink:0}.avatar-fallback{background:var(--gradient);color:#fff;text-transform:uppercase;place-items:center;font-size:.85rem;font-weight:700;display:grid}.menu{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);min-width:220px;box-shadow:var(--shadow-lg);padding:6px;animation:.12s ease-out pop;position:absolute;top:calc(100% + 8px);right:0}.menu-header{border-bottom:1px solid var(--border);align-items:center;gap:10px;margin-bottom:4px;padding:8px 10px 12px;font-weight:600;display:flex}.menu-item{border-radius:var(--radius-sm);text-align:left;background:0 0;border:0;align-items:center;gap:8px;width:100%;padding:8px 10px;font-size:.9rem;display:flex}.menu-item:hover{background:var(--bg-subtle)}.menu-user{flex-direction:column;display:flex}.menu-access{color:var(--muted);font-size:.8rem;font-weight:500}.hero{border-bottom:1px solid var(--border);position:relative;overflow:hidden}.hero:before{content:"";background-image:linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);pointer-events:none;background-size:48px 48px;position:absolute;inset:0;-webkit-mask-image:radial-gradient(70% 60% at 50% 30%,#000 30%,#0000 100%);mask-image:radial-gradient(70% 60% at 50% 30%,#000 30%,#0000 100%)}.hero:after{content:"";pointer-events:none;background:radial-gradient(closest-side,#8b5cf638,#0000);width:720px;height:480px;position:absolute;top:-240px;left:50%;transform:translate(-50%)}.hero-inner{z-index:1;text-align:center;flex-direction:column;align-items:center;padding-top:96px;padding-bottom:80px;display:flex;position:relative}.eyebrow{border:1px solid var(--border);background:var(--surface);color:var(--muted);box-shadow:var(--shadow-sm);border-radius:999px;padding:5px 14px;font-size:.8rem;font-weight:500}.hero h1{letter-spacing:-.04em;max-width:900px;margin-top:24px;font-size:clamp(2.2rem,5.5vw,4rem);font-weight:800;line-height:1.05}.hero h1 .gradient-text{display:inline-block}.gradient-text{background:var(--gradient);color:#0000;-webkit-background-clip:text;background-clip:text}.hero-lead{max-width:600px;color:var(--muted);margin-top:20px;font-size:1.125rem}.hero-actions{flex-wrap:wrap;justify-content:center;gap:12px;margin-top:36px;display:flex}.stats{gap:48px;margin:56px 0 0;display:flex}.stats div{flex-direction:column-reverse;align-items:center;display:flex}.stats dt{color:var(--muted);font-size:.85rem}.stats dd{letter-spacing:-.03em;font-variant-numeric:tabular-nums;margin:0;font-size:2rem;font-weight:700}.section-head{margin-bottom:24px}.features-section{padding-bottom:0}.feature-grid{grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;display:grid}.feature{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);flex-direction:column;gap:10px;padding:22px;display:flex}.feature h3{font-size:1.05rem}.feature p{font-size:.925rem;line-height:1.6}.section-head h2{font-size:1.6rem}.section-head p{margin-top:6px}.category-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;display:grid}.category-card{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-sm);flex-direction:column;gap:8px;padding:22px;transition:transform .2s,box-shadow .2s,border-color .2s;display:flex}.category-card:hover{border-color:var(--border-strong);box-shadow:var(--shadow);transform:translateY(-2px)}.category-card-top{justify-content:space-between;align-items:flex-start;margin-bottom:8px;display:flex}.category-icon{width:40px;height:40px;color:var(--tone);background:color-mix(in srgb, var(--tone) 12%, transparent);border-radius:10px;place-items:center;display:grid}.tone-0{--tone:var(--tone-0)}.tone-1{--tone:var(--tone-1)}.tone-2{--tone:var(--tone-2)}.tone-3{--tone:var(--tone-3)}.tone-4{--tone:var(--tone-4)}.tone-5{--tone:var(--tone-5)}.tone-6{--tone:var(--tone-6)}.category-card h3{font-size:1.125rem}.category-card p{flex:1;font-size:.9rem}.category-card-footer{border-top:1px solid var(--border);align-items:center;gap:12px;margin-top:12px;padding-top:16px;display:flex}.category-card-arrow{color:var(--muted);margin-left:auto;transition:transform .2s,color .2s}.category-card:hover .category-card-arrow{color:var(--text);transform:translate(3px)}.breadcrumbs{color:var(--muted);flex-wrap:wrap;align-items:center;gap:6px;margin-bottom:20px;font-size:.875rem;display:flex}.breadcrumbs a:hover{color:var(--text)}.breadcrumbs span:last-child{color:var(--text);font-weight:500}.page-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:28px;display:flex}.page-head h1{letter-spacing:-.03em;font-size:clamp(1.8rem,4vw,2.4rem);font-weight:800}.page-head p{margin-top:8px}.page-head-progress{grid-template-columns:200px auto;align-items:center;gap:8px 16px;display:grid}.page-head-progress .progress-label{color:var(--muted);justify-content:space-between;font-size:.85rem;display:flex}.page-head-progress .progress-label strong{color:var(--text)}.page-head-progress .progress{grid-column:1}.page-head-progress .button{grid-area:1/2/span 2}.question-list-wrap{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-sm);overflow:hidden}.question-list{margin:0;padding:0;list-style:none}.question-list li+li{border-top:1px solid var(--border)}.question-row{text-align:left;background:0 0;border:0;align-items:center;gap:16px;width:100%;min-height:60px;padding:12px 20px;transition:background .15s;display:flex}.question-row:hover{background:var(--surface-hover)}.row-number{width:22px;color:var(--muted);font-variant-numeric:tabular-nums;font-size:.8rem;font-weight:500}.row-status{border:1.5px solid var(--border-strong);width:22px;height:22px;color:var(--muted);border-radius:50%;flex-shrink:0;place-items:center;display:grid}.row-status.is-done{border-color:var(--success);background:var(--success);color:#fff}.is-hidden .row-status{background:var(--bg-subtle);border:0}.row-title{flex:1;align-items:center;gap:10px;min-width:0;font-weight:500;display:flex}.blurred{filter:blur(6px);opacity:.7;-webkit-user-select:none;user-select:none}.row-arrow{color:var(--muted);transition:transform .15s}.question-row:hover .row-arrow{color:var(--text);transform:translate(2px)}.unlock-card{border-top:1px solid var(--border);background:linear-gradient(135deg, #6366f114, #d946ef14), var(--surface);align-items:center;gap:16px;padding:20px;display:flex}.unlock-card h3{font-size:1rem}.unlock-card p{margin-top:2px;font-size:.9rem}.unlock-card .button{margin-left:auto}.unlock-icon{background:var(--gradient);color:#fff;border-radius:12px;flex-shrink:0;place-items:center;width:44px;height:44px;display:grid}.question-head{justify-content:space-between;align-items:center;gap:16px;margin-bottom:16px;display:flex}.question-meta{flex-wrap:wrap;align-items:center;gap:10px;font-size:.875rem;display:flex}.pager{gap:8px;display:flex}.container-narrow{max-width:928px}.workspace{flex-direction:column;gap:20px;display:flex}.panel{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-sm);flex-direction:column;gap:14px;padding:24px;display:flex}.question-title{letter-spacing:-.025em;margin-bottom:20px;font-size:1.75rem;font-weight:700}.field-label{color:var(--text-2);font-size:.85rem;font-weight:600}.answer-input{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);resize:vertical;width:100%;min-height:220px;padding:14px 16px;line-height:1.6;transition:border-color .15s,box-shadow .15s}.answer-input:focus{border-color:var(--accent);box-shadow:var(--ring);outline:none}.panel-actions{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.error-text{color:var(--danger);font-size:.9rem}.feedback{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-subtle);padding:16px 18px;animation:.25s ease-out fade-in}.feedback-title{color:var(--accent);align-items:center;gap:8px;font-size:.85rem;font-weight:700;display:flex}.feedback p{white-space:pre-line;margin-top:6px}.panel-article{gap:20px;padding:28px 32px 36px}.tabs{border-bottom:1px solid var(--border);gap:4px;margin-bottom:20px;display:flex}.tab{color:var(--muted);background:0 0;border:none;border-bottom:2px solid #0000;align-items:center;gap:8px;margin-bottom:-1px;padding:10px 16px;font-weight:600;transition:color .15s,border-color .15s;display:inline-flex}.tab:hover{color:var(--text)}.tab.is-active{border-bottom-color:var(--accent);color:var(--text)}.tab.is-active svg{color:var(--accent)}.answer-form-head{justify-content:space-between;align-items:center;min-height:36px;display:flex}.answer-input-wrap{position:relative}.answer-input-wrap .answer-input:not([readonly]){padding-bottom:30px}.char-count{color:var(--muted);pointer-events:none;font-size:.75rem;position:absolute;bottom:10px;right:12px}.verdict{border-radius:999px;margin-left:auto;padding:2px 10px;font-size:.75rem;font-weight:700}.verdict-correct{background:var(--success-soft);color:var(--success)}.verdict-partial{background:var(--warning-soft);color:var(--warning)}.verdict-incorrect{background:var(--danger-soft);color:var(--danger)}.verdict-off-topic{background:var(--bg-subtle);color:var(--muted)}.answer-input[readonly]{background:var(--bg-subtle);color:var(--text-2)}.checks-left{color:var(--muted);font-size:.875rem}.checks-left.is-empty{color:var(--warning)}.checked-footer{flex-wrap:wrap;justify-content:space-between;gap:8px 16px;font-size:.875rem;display:flex}.check-locked{border:1px dashed var(--border-strong);border-radius:var(--radius);background:var(--bg-subtle);flex-wrap:wrap;align-items:center;gap:14px;padding:14px 16px;display:flex}.check-locked>div{flex:1;min-width:220px}.check-locked p{margin-top:2px;font-size:.875rem}.check-locked .unlock-icon{border-radius:10px;width:36px;height:36px}.skeleton-article{border-radius:var(--radius);background:linear-gradient(90deg, var(--bg-subtle) 25%, var(--surface-hover) 50%, var(--bg-subtle) 75%);background-size:200% 100%;height:160px;animation:1.4s linear infinite shimmer}.markdown{color:var(--text-2);overflow-wrap:break-word;font-size:1rem;line-height:1.75;animation:.25s ease-out fade-in}.markdown>*+*{margin-top:1.1em}.markdown h2{border-bottom:1px solid var(--border);color:var(--text);margin-top:2.2em;padding-bottom:.35em;font-size:1.4rem}.markdown h3{color:var(--text);margin-top:1.8em;font-size:1.15rem}.markdown h2+*,.markdown h3+*{margin-top:.7em}.markdown strong{color:var(--text);font-weight:650}.markdown a{color:var(--accent);text-decoration:underline;-webkit-text-decoration-color:color-mix(in srgb, var(--accent) 40%, transparent);text-decoration-color:color-mix(in srgb, var(--accent) 40%, transparent);text-underline-offset:3px}.markdown a:hover{text-decoration-color:currentColor}.markdown ul,.markdown ol{padding-left:1.5em}.markdown li+li,.markdown li>ul,.markdown li>ol{margin-top:.35em}.markdown li::marker{color:var(--muted)}.markdown :not(pre)>code{border:1px solid var(--border);background:var(--bg-subtle);color:var(--text);font-family:var(--font-mono);border-radius:6px;padding:.12em .4em;font-size:.86em}.markdown img{border:1px solid var(--border);border-radius:var(--radius);background:#fff;max-width:100%;max-height:560px;margin:.4em auto;padding:12px;display:block}.markdown p:has(>img:only-child)+p>em:only-child{color:var(--muted);text-align:center;margin-top:-.4em;font-size:.875rem;display:block}.table-scroll{border:1px solid var(--border);border-radius:var(--radius);overflow-x:auto}.markdown table{border-collapse:collapse;width:100%;font-size:.9rem;line-height:1.5}.markdown th,.markdown td{border-bottom:1px solid var(--border);text-align:left;vertical-align:top;padding:10px 14px}.markdown th{background:var(--bg-subtle);color:var(--text);white-space:nowrap;font-weight:600}.markdown tr:last-child td{border-bottom:none}.callout{--callout:var(--accent);border:1px solid color-mix(in srgb, var(--callout) 25%, transparent);border-left:4px solid var(--callout);border-radius:var(--radius);background:color-mix(in srgb, var(--callout) 7%, var(--surface));padding:14px 18px}.callout>*+*{margin-top:.7em}.callout[data-title]:before{content:attr(data-title);color:var(--callout);letter-spacing:.04em;text-transform:uppercase;margin-bottom:4px;font-size:.8rem;font-weight:700;display:block}.callout-note{--callout:var(--tone-1)}.callout-warning{--callout:var(--warning)}.code-block{border:1px solid var(--border);border-radius:var(--radius);background:var(--code-bg);overflow:hidden}.code-block-head{border-bottom:1px solid var(--border);background:var(--code-head);color:var(--muted);letter-spacing:.02em;justify-content:space-between;align-items:center;padding:6px 8px 6px 16px;font-size:.75rem;font-weight:600;display:flex}.code-copy{color:var(--muted);background:0 0;border:none;border-radius:6px;align-items:center;gap:6px;padding:4px 8px;font-size:.75rem;display:inline-flex}.code-copy:hover{background:var(--surface-hover);color:var(--text)}.code-block pre{color:var(--code-text);font-family:var(--font-mono);tab-size:4;margin:0;padding:16px 18px;font-size:.85rem;line-height:1.65;overflow-x:auto}.code-block code{font-family:inherit}.hljs-keyword,.hljs-literal,.hljs-selector-tag{color:var(--code-keyword)}.hljs-string,.hljs-regexp{color:var(--code-string)}.hljs-comment,.hljs-quote{color:var(--code-comment);font-style:italic}.hljs-number,.hljs-variable,.hljs-attr{color:var(--code-number)}.hljs-title,.hljs-section{color:var(--code-title)}.hljs-type,.hljs-built_in,.hljs-title.class_{color:var(--code-type)}.hljs-meta,.hljs-tag,.hljs-name{color:var(--code-meta)}.pricing{flex-direction:column;gap:16px;display:flex}.pricing-head h1{font-size:2rem}.pricing-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));align-items:stretch;gap:16px;display:grid}.pricing-grid .skeleton-card{height:420px}.plan-card{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-sm);flex-direction:column;gap:10px;padding:24px;display:flex}.plan-card.is-featured{background:linear-gradient(var(--surface), var(--surface)) padding-box, var(--gradient) border-box;box-shadow:var(--shadow);border-width:2px;border-color:#0000;padding:23px}.plan-card-head{justify-content:space-between;align-items:center;gap:8px;display:flex}.plan-card h3{font-size:1.1rem}.plan-price{flex-wrap:wrap;align-items:baseline;gap:6px;display:flex}.plan-price strong{letter-spacing:-.02em;font-variant-numeric:tabular-nums;font-size:2.25rem;font-weight:800}.plan-price .chip{align-self:center}.plan-list-price{color:var(--muted);font-size:1.1rem}.plan-note{font-size:.875rem}.plan-savings{color:var(--success);font-size:.875rem;font-weight:600}.plan-features{flex-direction:column;flex:1;gap:8px;margin:6px 0 10px;padding:0;font-size:.925rem;list-style:none;display:flex}.plan-features li{align-items:flex-start;gap:8px;display:flex}.plan-features svg{color:var(--success);flex-shrink:0;margin-top:3px}.plan-card .button{width:100%}.sale-banner,.access-note{border-radius:var(--radius);align-items:center;gap:8px;padding:12px 16px;font-weight:600;display:flex}.sale-banner{background:linear-gradient(135deg, #6366f11f, #d946ef1f), var(--surface);color:var(--accent)}.access-note{background:var(--success-soft);color:var(--success)}.pricing-footer{text-align:center;flex-direction:column;align-items:center;gap:8px;display:flex}.promo-form{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.promo-form p{flex-basis:100%}.promo-input-wrap{border:1px solid var(--border);background:var(--surface);height:40px;color:var(--muted);border-radius:10px;align-items:center;gap:8px;padding:0 12px;display:flex}.promo-input-wrap:focus-within{border-color:var(--accent);box-shadow:var(--ring)}.promo-input{width:180px;color:var(--text);font:inherit;text-transform:uppercase;background:0 0;border:0;outline:none}.promo-input::placeholder{text-transform:none}.promo-applied{background:var(--success-soft);color:var(--success);border-radius:999px;align-items:center;gap:10px;padding:6px 6px 6px 14px;font-weight:600;display:inline-flex}.promo-applied .icon-button{border-radius:999px;width:28px;height:28px}.success-text{color:var(--success);font-size:.9rem}.link-button{color:var(--accent);font:inherit;background:0 0;border:0;padding:0;font-weight:600}.link-button:hover{text-decoration:underline}.unlock-icon.is-success{background:var(--success)}.locked-state{text-align:center;flex-direction:column;align-items:center;gap:14px;max-width:480px;margin:48px auto;display:flex}.locked-state h1{font-size:1.6rem}.error-state,.banner-error{border:1px solid color-mix(in srgb, var(--danger) 30%, transparent);border-radius:var(--radius);background:var(--danger-soft);color:var(--danger);padding:14px 18px}.banner-error{justify-content:space-between;align-items:center;gap:12px;margin-top:16px;display:flex}.skeleton-card,.skeleton-list{border-radius:var(--radius-lg);background:linear-gradient(90deg, var(--bg-subtle) 25%, var(--surface-hover) 50%, var(--bg-subtle) 75%);background-size:200% 100%;animation:1.4s linear infinite shimmer}.skeleton-card{height:196px}.skeleton-list{height:420px}.login-dialog{border:1px solid var(--border);background:var(--surface);width:min(420px,100vw - 32px);color:var(--text);box-shadow:var(--shadow-lg);border-radius:20px;padding:0}.login-dialog[open]{animation:.18s ease-out pop}.login-dialog::backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#09090b73}.login-panel{flex-direction:column;gap:10px;padding:32px 28px 24px;display:flex;position:relative}.login-panel h2{padding-right:32px;font-size:1.4rem}.login-close{background:0 0;border:0;width:32px;height:32px;position:absolute;top:16px;right:16px}.provider-list{flex-direction:column;gap:10px;margin-top:16px;display:flex}.provider-button{border:1px solid var(--border);background:var(--surface);border-radius:12px;justify-content:center;align-items:center;gap:12px;height:48px;font-weight:600;transition:background .15s,border-color .15s;display:flex}.provider-button:hover:not(:disabled){background:var(--surface-hover);border-color:var(--border-strong)}.provider-button:disabled{opacity:.45;cursor:not-allowed}.notice{border-radius:var(--radius-sm);background:var(--warning-soft);color:var(--warning);padding:10px 12px;font-size:.85rem}.fine-print{color:var(--muted);text-align:center;margin-top:8px;font-size:.8rem}.footer{border-top:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;gap:12px 16px;padding-top:24px;padding-bottom:32px;font-size:.85rem;display:flex}.footer-main,.footer-links{flex-wrap:wrap;gap:4px 16px;display:flex}.footer-links a{color:var(--text-2)}.footer-links a:hover{color:var(--accent)}.footer-company{flex-basis:100%;font-size:.8rem}.legal-page{max-width:820px}.legal-page .markdown h1{color:var(--text);letter-spacing:-.02em;font-size:2rem;line-height:1.2}.legal-page .markdown h2{font-size:1.25rem}.consent{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);max-width:720px;color:var(--text-2);cursor:pointer;align-items:flex-start;gap:10px;margin:20px auto 0;padding:12px 14px;font-size:.85rem;line-height:1.5;display:flex}.consent.is-invalid{border-color:var(--danger);background:var(--danger-soft)}.consent input{width:16px;height:16px;accent-color:var(--accent);flex-shrink:0;margin-top:2px}@keyframes pop{0%{opacity:0;transform:translateY(4px)scale(.98)}}@keyframes fade-in{0%{opacity:0;transform:translateY(4px)}}@keyframes shimmer{to{background-position:-200% 0}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}@media (width<=640px){.container{padding:0 16px}.header-inner{gap:16px}.header-nav,.user-name{display:none}.user-button{padding:3px}.hero-inner{padding-top:64px;padding-bottom:56px}.stats{gap:32px}.category-grid{grid-template-columns:1fr}.page-head-progress{grid-template-columns:1fr auto;width:100%}.question-row{gap:12px;padding:12px 14px}.row-number{display:none}.unlock-card{flex-wrap:wrap}.unlock-card .button,.promo-form,.promo-input-wrap{width:100%}.promo-input{flex:1;width:auto}.promo-form .button{width:100%}.panel{padding:18px}.markdown{font-size:.95rem}.markdown img{padding:6px}.footer{flex-direction:column;gap:4px}}