.js #home-static{display:none!important}:root{--max-content-width: 1180px;--nu-bg: #f3f6f4;--nu-bg-deep: #e9efec;--nu-surface: #ffffff;--nu-surface-hi: #ffffff;--nu-light: #ffffff;--nu-dark: #c9d4ce;--nu-dark-ink: #a4b8b0;--text: #16231e;--text-muted: #52645d;--text-faint: #7b8c85;--primary: #10b981;--primary-strong: #059669;--primary-deep: #047857;--primary-wash: rgba(16, 185, 129, .12);--danger: #a5251b;--danger-bg: #f7e4e1;--bg: var(--nu-bg);--bg-accent: var(--nu-surface-hi);--surface: var(--nu-surface);--surface-muted: var(--nu-bg-deep);--border: #dde5e0;--border-strong: #c2cfc8;--nu-raised-xs: 0 1px 2px rgba(22, 35, 30, .06);--nu-raised-sm: 0 1px 3px rgba(22, 35, 30, .08);--nu-raised: 0 2px 10px rgba(22, 35, 30, .07);--nu-raised-lg: 0 6px 20px rgba(22, 35, 30, .09);--nu-raised-xl: 0 12px 32px rgba(22, 35, 30, .1);--nu-inset-xs: inset 0 1px 2px rgba(22, 35, 30, .04);--nu-inset: inset 0 1px 3px rgba(22, 35, 30, .05);--nu-inset-deep: inset 0 2px 5px rgba(22, 35, 30, .06);--nu-accent-glow: 0 2px 8px rgba(5, 150, 105, .22);--nu-accent-glow-lg: 0 4px 14px rgba(5, 150, 105, .28);--nu-focus-ring: 0 0 0 3px rgba(16, 185, 129, .25);--shadow-sm: var(--nu-raised-sm);--shadow-md: var(--nu-raised);--shadow-lg: var(--nu-raised-lg);--ease: cubic-bezier(.22, .61, .36, 1);--ease-snap: cubic-bezier(.34, 1.4, .64, 1);--dur: .18s;--radius-sm: 10px;--radius: 15px;--radius-lg: 22px;--radius-xl: 28px;--radius-pill: 999px}*{-webkit-tap-highlight-color:transparent}html,body{margin:0;padding:0;min-width:100%;width:100%}::selection{background:#10b98142;color:var(--text)}.app-shell{position:relative;min-height:100vh;padding:22px;box-sizing:border-box;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;color:var(--text);background-color:var(--nu-bg)}.app-shell>*{position:relative;z-index:1}.form-scroll,.viewer-viewport,.worksheet-viewer,.prompt-preview,.account-dropdown{scrollbar-width:thin;scrollbar-color:var(--nu-dark) transparent}.form-scroll::-webkit-scrollbar,.viewer-viewport::-webkit-scrollbar,.worksheet-viewer::-webkit-scrollbar,.prompt-preview::-webkit-scrollbar{width:11px;height:11px}.form-scroll::-webkit-scrollbar-track,.viewer-viewport::-webkit-scrollbar-track,.worksheet-viewer::-webkit-scrollbar-track,.prompt-preview::-webkit-scrollbar-track{background:transparent;border-radius:var(--radius-pill)}.form-scroll::-webkit-scrollbar-thumb,.viewer-viewport::-webkit-scrollbar-thumb,.worksheet-viewer::-webkit-scrollbar-thumb,.prompt-preview::-webkit-scrollbar-thumb{border:3px solid transparent;background-clip:content-box;background-color:var(--nu-dark);border-radius:var(--radius-pill)}.form-scroll::-webkit-scrollbar-thumb:hover,.viewer-viewport::-webkit-scrollbar-thumb:hover,.worksheet-viewer::-webkit-scrollbar-thumb:hover,.prompt-preview::-webkit-scrollbar-thumb:hover{background-color:var(--nu-dark-ink)}.top-nav{position:relative;z-index:50;max-width:var(--max-content-width);margin:0 auto 22px;padding:11px 20px;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--nu-surface);box-shadow:var(--nu-raised-sm);font-size:15px;font-weight:700;letter-spacing:.01em;display:flex;align-items:center;justify-content:space-between;gap:12px}.top-nav-logo{display:block;height:42px;width:auto;max-width:100%;filter:drop-shadow(1px 2px 2px rgba(120,145,136,.45))}.nav-logo-btn{background:none;border:none;padding:2px;cursor:pointer;display:flex;align-items:center;border-radius:var(--radius);transition:transform var(--dur) var(--ease)}.nav-logo-btn:hover{transform:scale(1.03)}.nav-logo-btn:active{transform:scale(.98)}.top-nav-links{display:flex;align-items:center;gap:6px}.nav-link{background:transparent;border:none;padding:8px 14px;font-size:13px;font-weight:650;color:var(--text-muted);cursor:pointer;border-radius:var(--radius-sm);font-family:inherit;box-shadow:0 0 #0000;transition:color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease)}.nav-link:hover{color:var(--text);box-shadow:var(--nu-raised-xs);transform:translateY(-1px)}.nav-link:active{color:var(--primary-deep);box-shadow:var(--nu-inset-xs);transform:translateY(0)}a.nav-link,a.footer-link{text-decoration:none}a.nav-logo-btn{text-decoration:none;color:inherit}.site-layout{max-width:var(--max-content-width);margin:0 auto}.workspace{min-width:0}.app-window{border:1px solid var(--border);border-radius:var(--radius-xl);background:var(--nu-bg-deep);display:grid;grid-template-columns:1.08fr .92fr;gap:20px;padding:20px;height:76vh;min-height:76vh}.app-window>.pane{min-width:0}.pane{min-height:0;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--nu-surface);box-shadow:var(--nu-raised-xs);overflow:hidden}.preview-pane{display:flex;flex-direction:column;min-width:0}.editor-pane{display:flex;flex-direction:column;height:100%;min-height:0}.info-window{margin-top:22px;border:1px solid var(--border);border-radius:var(--radius-xl);background:var(--nu-surface);box-shadow:var(--nu-raised);padding:20px}.content-section{margin-top:28px}.content-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.content-card{background:var(--nu-surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px 26px;box-shadow:var(--nu-raised-xs);transition:box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease)}.content-card:hover{box-shadow:var(--nu-raised-lg);transform:translateY(-2px)}.content-card-title{font-size:15.5px;font-weight:750;color:var(--text);margin:0 0 10px;letter-spacing:-.01em}.content-card-text{font-size:13.5px;color:var(--text-muted);line-height:1.75;margin:0 0 10px}.content-card-text:last-child{margin-bottom:0}.content-card-text code,.content-card code{font-family:JetBrains Mono,Menlo,Monaco,Courier New,monospace;font-size:12px;background:var(--nu-bg-deep);border:none;box-shadow:var(--nu-inset-xs);border-radius:5px;padding:2px 6px;color:var(--text)}.content-card-list{margin:0;padding-left:18px;display:flex;flex-direction:column;gap:7px}.content-card-list li{font-size:13.5px;color:var(--text-muted);line-height:1.55}.content-card-faq{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:13px}.content-card-faq li{display:flex;flex-direction:column;gap:3px}.content-card-faq li strong{font-size:13px;color:var(--text);font-weight:700}.content-card-faq li span{font-size:13px;color:var(--text-muted);line-height:1.55}.info-content{border:1px solid var(--border);border-radius:var(--radius);background:var(--nu-bg-deep);padding:18px 20px;color:var(--text-muted);font-size:14px;line-height:1.68}.info-content>p{margin:0 0 12px}.info-content>p:last-child{margin-bottom:0}.info-loading-note{padding:11px 14px;margin:0 0 14px!important;border-radius:var(--radius-sm);border:none;background:var(--primary-wash);box-shadow:var(--nu-inset-xs),inset 0 0 0 1px #10b9813d;color:var(--text);font-size:13px;line-height:1.55}.info-content-label{margin:18px 0 10px!important;font-size:11.5px;font-weight:750;color:var(--text);text-transform:uppercase;letter-spacing:.07em}.info-steps{margin:0;padding-left:22px;display:flex;flex-direction:column;gap:9px;color:var(--text-muted);font-size:14px;line-height:1.6}.info-steps li{padding-left:4px}.toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:9px;padding:13px 14px;border-bottom:1px solid var(--border);background:var(--nu-surface)}.aqua-btn{border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--nu-surface);color:var(--text);font-size:12px;font-weight:650;font-family:inherit;padding:8px 12px;min-width:38px;line-height:1;cursor:pointer;box-shadow:var(--nu-raised-xs);transition:box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease)}.aqua-btn:hover{color:var(--primary-deep);border-color:var(--primary);box-shadow:var(--nu-raised-sm);transform:translateY(-1px)}.aqua-btn:active{box-shadow:var(--nu-inset-xs);transform:translateY(0)}.aqua-btn.active{color:var(--primary-deep);background:var(--primary-wash);border-color:var(--primary);box-shadow:none}.aqua-btn--danger{color:var(--danger)}.aqua-btn--danger:hover{color:var(--danger);box-shadow:var(--nu-raised),0 0 0 1px #a5251b29}.aqua-btn:disabled{opacity:.5;cursor:default;box-shadow:var(--nu-inset-xs);transform:none}.zoom-readout{margin-left:auto;font-size:12px;font-weight:700;color:var(--text-muted);padding:6px 12px;border-radius:var(--radius-pill);background:var(--nu-bg-deep);border:1px solid var(--border);font-variant-numeric:tabular-nums}.viewer-viewport{position:relative;flex:1;min-width:0;min-height:0;overflow:auto;padding:22px;background:var(--nu-bg-deep);display:flex;flex-direction:column}.viewer-viewport>.viewer-content{flex-shrink:0}.viewer-content{margin:0 auto;position:relative}.pages-stack{display:flex;flex-direction:column;gap:24px;transform-origin:top left}.latex-page{width:816px;min-height:1056px;background:#fff;border-radius:6px;border:none;box-shadow:0 1px 2px #50645c33,0 14px 30px #50645c38,0 28px 56px #50645c1f;box-sizing:border-box;overflow:hidden}.latex-page.welcome-page{padding:56px;height:1056px;min-height:auto}.welcome-wrapper--desktop .latex-page.welcome-page{width:100%;max-width:816px;height:auto;flex:1;min-height:clamp(420px,48vh,720px);box-sizing:border-box}.latex-page.pdf-page{padding:0}.pdf-page-img{width:100%;display:block}.welcome-wrapper{margin:0 auto}.welcome-wrapper--desktop{width:100%;max-width:100%;min-width:0;box-sizing:border-box;flex:1;display:flex;flex-direction:column;min-height:0}.welcome-inner-scale{box-sizing:border-box}.welcome-wrapper--desktop .welcome-inner-scale{width:100%;max-width:816px;margin:0 auto;flex:1;display:flex;flex-direction:column;min-height:0}.welcome-wrapper--desktop .welcome-inner-scale>.latex-page.welcome-page{display:flex;flex-direction:column}.welcome-title{margin:0 0 4px;font-size:28px;font-weight:800;color:var(--text);letter-spacing:-.02em}.welcome-text{font-size:15px;line-height:1.75;color:#1c2b26;margin:0 0 20px;overflow-wrap:break-word;word-wrap:break-word}.welcome-text--short{margin-bottom:12px}.mobile-preview-empty{min-height:6px}.preview-generating-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;box-sizing:border-box;width:100%;min-height:min(420px,55vh);padding:40px 16px}.preview-generating-label{font-size:15px;font-weight:700;color:var(--text-muted);letter-spacing:.01em}.preview-generating-hint{font-size:13px;color:var(--text-faint);text-align:center;max-width:270px;line-height:1.6}@keyframes engine-loading-spin{to{transform:rotate(360deg)}}.engine-loading-spinner{flex-shrink:0;width:22px;height:22px;border:2px solid rgba(150,172,164,.4);border-top-color:var(--primary-strong);border-radius:50%;animation:engine-loading-spin .65s linear infinite}.engine-loading-spinner--large{width:34px;height:34px;border-width:3px;box-shadow:var(--nu-raised-xs)}.engine-loading-spinner--inline{width:15px;height:15px;border-width:2px;border-color:#fff6;border-top-color:#fff;box-shadow:none}.engine-loading-callout{display:flex;flex-direction:column;gap:14px;margin:20px 0 0;padding:16px 18px;border-radius:var(--radius);border:1px solid var(--border);background:var(--nu-bg-deep);box-shadow:var(--nu-inset);min-width:0;max-width:100%;box-sizing:border-box}.engine-loading-callout-top{display:flex;align-items:flex-start;gap:14px;min-width:0}.engine-load-progress{width:100%;height:10px;border-radius:var(--radius-pill);background:var(--nu-bg-deep);box-shadow:var(--nu-inset-xs);overflow:hidden;box-sizing:border-box}.engine-load-progress-fill{height:100%;width:0%;border-radius:var(--radius-pill);background:var(--primary);transition:width .28s ease-out}.engine-loading-callout-text{display:flex;flex-direction:column;gap:6px;min-width:0;overflow-wrap:break-word;word-wrap:break-word}.engine-loading-callout-title{font-size:15px;font-weight:750;color:var(--text)}.engine-loading-callout-detail{font-size:13px;line-height:1.6;color:var(--text-muted)}.error-box{margin:16px;padding:12px 14px;border-radius:var(--radius-sm);border:none;background:var(--danger-bg);box-shadow:var(--nu-inset-xs),inset 0 0 0 1px #a5251b2e;color:var(--danger);font-size:13px;line-height:1.55;font-weight:550;white-space:pre-wrap}.mobile-error-inline{margin:12px}.form-scroll{flex:1;overflow-y:auto;padding:10px 18px 18px}.form-section{padding:16px 0;border-bottom:1px solid var(--border)}.form-section:last-child{border-bottom:none}.form-heading{margin:0 0 12px;font-size:11.5px;font-weight:800;color:var(--text);text-transform:uppercase;letter-spacing:.08em}.form-sub-heading{margin:14px 0 7px;font-size:12px;font-weight:650;color:var(--text-muted)}.segment-group{display:flex;gap:4px;border:1px solid var(--border);border-radius:var(--radius);padding:4px;background:var(--nu-bg-deep)}.segment-btn{flex:1;padding:9px 10px;font-size:13px;font-weight:650;font-family:inherit;color:var(--text-muted);background:transparent;border:none;border-right:none;border-radius:var(--radius-sm);cursor:pointer;transition:background var(--dur) var(--ease),color var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.segment-btn:last-child{border-right:none}.segment-btn:hover{color:var(--text);background:#ffffffb3}.segment-btn.active{color:#fff;background:var(--primary);box-shadow:var(--nu-accent-glow)}.form-label{display:flex;flex-direction:column;gap:6px;font-size:11.5px;font-weight:700;color:var(--text-muted);margin-top:12px;letter-spacing:.02em}.form-label.compact{max-width:180px}.form-row{display:flex;gap:12px;align-items:flex-end}.form-input,.form-select,.form-textarea{padding:11px 13px;font-size:13px;font-family:inherit;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--nu-surface);color:var(--text);outline:none;transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.form-input:hover,.form-select:hover,.form-textarea:hover{border-color:var(--nu-dark-ink)}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--primary);box-shadow:var(--nu-focus-ring)}.form-input::placeholder,.form-textarea::placeholder{color:var(--text-faint)}.form-select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg width='10' height='6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%237b8c85'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:30px;cursor:pointer}.form-textarea{resize:vertical;min-height:68px;line-height:1.55}.checkbox-group{display:flex;flex-wrap:wrap;gap:4px 16px}.checkbox-label,.toggle-row{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--text);cursor:pointer;padding:5px 0;transition:color var(--dur) var(--ease)}.checkbox-label:hover,.toggle-row:hover{color:var(--primary-deep)}.checkbox-label input[type=checkbox],.toggle-row input[type=checkbox]{appearance:none;-webkit-appearance:none;flex-shrink:0;position:relative;width:19px;height:19px;margin:0;border:1px solid var(--border-strong);border-radius:6px;background:var(--nu-surface);cursor:pointer;transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.checkbox-label input[type=checkbox]:checked,.toggle-row input[type=checkbox]:checked{background:var(--primary);border-color:var(--primary-strong);box-shadow:var(--nu-raised-xs)}.checkbox-label input[type=checkbox]:checked:after,.toggle-row input[type=checkbox]:checked:after{content:"";position:absolute;left:6px;top:3px;width:5px;height:9px;border:solid #fff;border-width:0 2.2px 2.2px 0;transform:rotate(42deg)}.checkbox-label input[type=checkbox]:focus-visible,.toggle-row input[type=checkbox]:focus-visible{border-color:var(--primary);box-shadow:var(--nu-focus-ring)}.toggle-group{display:flex;flex-direction:column}.advanced-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;padding:0;margin:0;font-size:11.5px;font-weight:800;color:var(--text-muted);background:none;border:none;cursor:pointer;text-transform:uppercase;letter-spacing:.08em;font-family:inherit;transition:color var(--dur) var(--ease)}.advanced-toggle:hover{color:var(--primary-deep)}.toggle-chevron{font-size:11px;transition:transform .26s var(--ease-snap);display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:50%;background:var(--nu-surface);box-shadow:var(--nu-raised-xs)}.toggle-chevron.open{transform:rotate(180deg)}.advanced-content{padding-top:12px}.prompt-preview{position:relative;margin-top:12px;border:none;border-radius:var(--radius-sm);background:var(--nu-bg-deep);box-shadow:var(--nu-inset);padding:14px;max-height:200px;overflow-y:auto}.prompt-text{margin:0;font-size:11px;line-height:1.6;color:var(--text-muted);white-space:pre-wrap;word-break:break-word;font-family:JetBrains Mono,Menlo,Monaco,Courier New,monospace}.copy-btn{position:absolute;top:9px;right:9px;font-size:11px;font-weight:700;font-family:inherit;padding:5px 11px;border:1px solid var(--border-strong);border-radius:7px;background:var(--nu-surface);box-shadow:var(--nu-raised-xs);color:var(--text-muted);cursor:pointer;transition:box-shadow var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease)}.copy-btn:hover{color:var(--primary-deep);border-color:var(--primary);box-shadow:var(--nu-raised-sm)}.copy-btn:active{box-shadow:var(--nu-inset-xs)}.editor-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:14px 16px 16px;border-top:1px solid var(--border);background:var(--nu-surface)}.editor-actions .quota-hint{width:100%;margin:0;font-size:12px;line-height:1.4;color:var(--text-muted);font-weight:550}.editor-actions-primary{display:flex;width:100%;gap:10px}.editor-actions-results{display:flex;width:100%;flex-wrap:wrap;align-items:center;gap:10px;margin-top:4px;padding-top:12px;border-top:1px solid var(--border)}.editor-actions-results .preview-btn{flex:1;min-width:130px}.preview-btn{border:1px solid var(--primary-strong);border-radius:var(--radius-sm);background:var(--primary);color:#fff;font-size:13px;font-weight:700;font-family:inherit;padding:11px 18px;cursor:pointer;box-shadow:var(--nu-accent-glow);transition:box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease);display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;letter-spacing:.01em}.preview-btn:hover{background:var(--primary-strong);border-color:var(--primary-deep);transform:translateY(-1px);box-shadow:var(--nu-accent-glow-lg)}.preview-btn:active{transform:translateY(0);box-shadow:var(--nu-inset-xs)}.preview-btn--secondary{background:var(--nu-surface);border-color:var(--border-strong);color:var(--primary-deep);box-shadow:var(--nu-raised-xs)}.preview-btn--secondary:hover:not(:disabled){background:var(--primary-wash);border-color:var(--primary);box-shadow:var(--nu-raised-sm)}.preview-btn--secondary:active{box-shadow:var(--nu-inset-xs)}.preview-btn:disabled,.generate-btn:disabled{opacity:.5;cursor:not-allowed;transform:none;filter:none;box-shadow:var(--nu-inset-xs);text-shadow:none}.generate-btn{width:100%}.generate-btn--engine-loading{display:inline-flex;align-items:center;justify-content:center;gap:9px}.preview-saved-link{font-size:13px;font-weight:650;color:var(--primary-deep);text-decoration:none;align-self:center;padding:8px 12px;border-radius:var(--radius-sm);transition:box-shadow var(--dur) var(--ease)}.preview-saved-link:hover{box-shadow:var(--nu-raised-xs)}.site-footer{max-width:var(--max-content-width);margin:30px auto 0;padding:20px 22px;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--nu-bg-deep)}.footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.footer-brand{font-size:13px;color:var(--text-muted);font-weight:600}.footer-links{display:flex;gap:4px;flex-wrap:wrap}.footer-link{background:none;border:none;padding:6px 11px;font-size:13px;color:var(--text-muted);cursor:pointer;border-radius:8px;font-family:inherit;transition:color var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.footer-link:hover{color:var(--primary-deep);box-shadow:var(--nu-raised-xs)}.footer-link:active{box-shadow:var(--nu-inset-xs)}.legal-page{max-width:760px;margin:32px auto 64px;padding:44px 50px;background:var(--nu-surface);border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--nu-raised);line-height:1.78;color:var(--text)}.legal-page h1{font-size:27px;font-weight:800;margin:0 0 10px;color:var(--text);letter-spacing:-.02em}.legal-page h2{font-size:16.5px;font-weight:750;margin:30px 0 10px;color:var(--text);letter-spacing:-.01em}.legal-page p{margin:0 0 14px;font-size:14px;color:var(--text-muted)}.legal-page ul{margin:0 0 14px;padding-left:22px}.legal-page li{font-size:14px;color:var(--text-muted);margin-bottom:7px}.legal-page a{color:var(--primary-deep);text-decoration:underline;text-decoration-color:#04785766;text-underline-offset:2px;transition:text-decoration-color var(--dur) var(--ease)}.legal-page a:hover{color:var(--primary-strong);text-decoration-color:var(--primary)}.static-app-cta{max-width:760px;margin:0 auto 48px;padding:0 50px;font-size:14px;color:#64748b;text-align:center}.inline-link{background:none;border:none;padding:0;font-size:inherit;color:var(--primary-deep);text-decoration:underline;text-underline-offset:2px;cursor:pointer;font-family:inherit}.inline-link:hover{color:var(--primary-strong)}.worksheet-page{max-width:860px}.worksheet-sheets-wrap{margin:32px 0}.worksheet-viewer{position:relative;height:clamp(420px,72vh,900px);overflow:auto;padding:22px;background:var(--nu-bg-deep);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--nu-inset)}.worksheet-viewer .worksheet-sheets{display:flex;flex-direction:column;gap:40px}.worksheet-sheets-download{margin:0;border-radius:var(--radius-sm)}.worksheet-sheets-download .preview-btn,.worksheet-sheets-download .preview-btn:hover{text-decoration:none;color:#fff}.worksheet-sheets{display:flex;flex-direction:column;gap:40px}.worksheet-sheet{width:100%;max-width:816px;margin:0 auto;padding:72px 76px;box-sizing:border-box;background:#fff;border-radius:3px;box-shadow:0 1px 2px #50645c38,0 14px 32px #50645c38,0 30px 60px #50645c1f;font-family:KaTeX_Main,Computer Modern,"CMU Serif",Georgia,Times New Roman,serif;color:#000;min-height:760px}.worksheet-sheet-header{margin-bottom:20px}.worksheet-sheet-title{font-size:22.5px;font-weight:700;margin:26px 0 18px;color:#000;text-align:center;font-family:inherit}.worksheet-sheet-title--answers{margin-top:0;margin-bottom:26px}.worksheet-sheet-hr{border:none;border-top:.8px solid #000;margin:12px 0 0}.worksheet-sheet-name-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 28px;font-size:16px}.worksheet-sheet-field{display:inline-flex;align-items:baseline;gap:8px;white-space:nowrap;flex:1}.worksheet-sheet-field:first-child{flex:2}.worksheet-sheet-rule{display:inline-block;flex:1;min-width:110px;border-bottom:.8px solid #000;height:1em;vertical-align:baseline}.worksheet-sheet-rule--mid{min-width:90px}.worksheet-sheet-rule--short{min-width:60px}.worksheet-sheet-instructions{font-size:15.5px;line-height:1.5;margin:0;color:#000;font-family:inherit;text-align:justify}.worksheet-sheet-problems,.worksheet-sheet-answers-list{margin:0;padding-left:20px;list-style:none}.worksheet-sheet .worksheet-problem{margin-bottom:20px}.worksheet-problem-num,.worksheet-answer-num{display:inline-block;min-width:24px}.worksheet-sheet .worksheet-problem-prompt{display:flex;gap:8px;align-items:baseline}.worksheet-sheet .worksheet-problem-prompt .worksheet-problem-num{flex-shrink:0;min-width:0}.worksheet-problem-text{flex:1;min-width:0}.worksheet-sheet .worksheet-answer{display:flex;gap:8px;align-items:baseline;margin-bottom:18px}.worksheet-answer-num{flex-shrink:0;min-width:0}.worksheet-answer-body{flex:1}.worksheet-sheet .worksheet-problem-prompt,.worksheet-sheet .worksheet-answer-final{font-size:16px;line-height:1.55;color:#000;margin:0 0 4px}.worksheet-sheet .worksheet-choices{margin:6px 0 0 32px;padding-left:0;list-style:none}.worksheet-sheet .worksheet-choices li{font-size:16px;color:#000;font-family:inherit;margin-bottom:4px}.worksheet-sheet .worksheet-solution{font-size:16px!important;color:#000!important;font-style:normal;margin:0 0 4px!important;line-height:1.55}.worksheet-blank{display:inline-block;min-width:80px;border-bottom:.8px solid #000;height:1em;vertical-align:baseline;margin:0 2px}.worksheet-underline{text-decoration:underline}.worksheet-workspace{min-height:170px;display:block}.worksheet-sheet-continued{margin-bottom:24px;text-align:center}.worksheet-sheet-continued-text{font-size:13px;font-weight:600;color:#000;margin:0;padding-bottom:8px;border-bottom:.8px solid #000}.worksheet-inline-list{margin:6px 0;padding-left:22px}.worksheet-inline-list li{margin-bottom:2px}.worksheet-code{background:#f5f5f5;border:1px solid #ddd;border-radius:4px;padding:10px 14px;margin:8px 0;font-family:Courier New,Courier,monospace;font-size:14px;line-height:1.5;white-space:pre-wrap;overflow-x:auto;color:#000}.worksheet-sheet code{font-family:Courier New,Courier,monospace;font-size:.95em;background:#0000000f;padding:1px 4px;border-radius:3px}.worksheet-sheet .katex-display{margin:.5em 0;overflow-x:auto;overflow-y:hidden}.worksheet-sheet .katex{font-size:1em}.worksheet-article h1,.worksheet-index h1{font-size:27px;font-weight:800;margin:0 0 12px;color:var(--text);letter-spacing:-.02em}.worksheet-breadcrumb{font-size:13px;color:var(--text-muted);margin-bottom:18px}.worksheet-breadcrumb a{color:var(--primary-deep);text-decoration:none;font-weight:600}.worksheet-breadcrumb a:hover{text-decoration:underline}.worksheet-meta{display:flex;flex-wrap:wrap;gap:9px;margin:0 0 22px}.worksheet-badge{display:inline-block;font-size:11.5px;font-weight:700;padding:6px 13px;border-radius:var(--radius-pill);background:var(--nu-bg-deep);border:none;box-shadow:var(--nu-inset-xs);color:var(--text-muted);letter-spacing:.02em}.worksheet-badge-easy{background:#10b98124;color:var(--primary-deep);box-shadow:var(--nu-inset-xs),inset 0 0 0 1px #10b9813d}.worksheet-badge-medium{background:#d9770624;color:#a35809;box-shadow:var(--nu-inset-xs),inset 0 0 0 1px #d977063d}.worksheet-badge-hard{background:#b91c1c1f;color:#a02020;box-shadow:var(--nu-inset-xs),inset 0 0 0 1px #b91c1c38}.worksheet-article h2,.worksheet-index h2{font-size:16.5px;font-weight:750;margin:30px 0 11px;color:var(--text);letter-spacing:-.01em}.worksheet-intro p,.worksheet-index-lead{font-size:14px;color:var(--text-muted);line-height:1.78;margin:0 0 14px}.worksheet-list{margin:0 0 14px;padding-left:22px}.worksheet-list li{font-size:14px;color:var(--text-muted);margin-bottom:7px}.worksheet-problem-list,.worksheet-answer-list{margin:0;padding-left:22px}.worksheet-problem,.worksheet-answer{margin-bottom:16px}.worksheet-problem-prompt{font-size:14px;color:var(--text);margin:0 0 8px;line-height:1.6}.worksheet-choices{margin:0 0 8px;padding-left:20px}.worksheet-choices li{font-size:13.5px;color:var(--text-muted);margin-bottom:4px}.worksheet-answer-final{font-size:14px;color:var(--text);margin:0 0 4px}.worksheet-solution{font-size:13px!important;color:var(--text-muted)!important;font-style:italic;margin:0!important}.worksheet-cta{margin-top:34px;padding:24px 26px;border-radius:var(--radius-lg);border:1px solid var(--border);background:var(--nu-surface);box-shadow:var(--nu-raised-xs)}.worksheet-cta p{font-size:14px;color:var(--text-muted)}.worksheet-cta-btn{display:inline-block;margin-top:10px;padding:12px 20px;border-radius:var(--radius-sm);border:1px solid var(--primary-strong);background:var(--primary);color:#fff!important;text-decoration:none!important;font-weight:700;font-size:14px;box-shadow:var(--nu-accent-glow);transition:transform var(--dur) var(--ease),background var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.worksheet-cta-btn:hover{color:#fff!important;background:var(--primary-strong);transform:translateY(-1px);box-shadow:var(--nu-accent-glow-lg)}.worksheet-cta-btn:active{transform:translateY(0);box-shadow:var(--nu-inset-xs)}.worksheet-related ul{margin:0;padding-left:22px}.worksheet-related li{font-size:14px;margin-bottom:7px}.worksheet-related a{color:var(--primary-deep)}.worksheet-updated{margin-top:30px;font-size:13px;color:var(--text-faint)}.worksheet-index-group{margin-bottom:30px}.worksheet-index-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}.worksheet-index-card a{display:block;padding:18px 20px;border-radius:var(--radius);border:1px solid var(--border);background:var(--nu-surface);text-decoration:none;box-shadow:var(--nu-raised-xs);transition:box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease),border-color var(--dur) var(--ease)}.worksheet-index-card a:hover{border-color:var(--primary);box-shadow:var(--nu-raised);transform:translateY(-2px)}.worksheet-index-card a:active{box-shadow:var(--nu-inset);transform:translateY(0)}.worksheet-index-topic{display:block;font-size:15px;font-weight:750;color:var(--text);margin-bottom:5px}.worksheet-index-course{display:block;font-size:13px;color:var(--text-muted);margin-bottom:7px}.worksheet-index-meta{display:block;font-size:12px;color:var(--text-faint)}.form-heading-optional{font-size:10px;font-weight:700;text-transform:none;letter-spacing:0;color:var(--primary-deep);background:var(--primary-wash);border:none;box-shadow:inset 0 0 0 1px #10b9814d;border-radius:6px;padding:3px 8px;vertical-align:middle;margin-left:7px}.upload-hint,.form-hint{margin:0 0 10px;font-size:12.5px;line-height:1.6;color:var(--text-muted)}.form-hint{margin-top:-4px}.upload-dropzone{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;padding:22px 14px;border:2px dashed var(--border-strong);border-radius:var(--radius);background:var(--nu-bg-deep);cursor:pointer;transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease)}.upload-dropzone:hover{border-color:var(--primary);background:var(--primary-wash)}.upload-dropzone--active{border-color:var(--primary-strong);border-style:solid;background:#10b98124;box-shadow:var(--nu-focus-ring)}.upload-dropzone-plus{font-size:26px;font-weight:300;color:var(--primary-strong);line-height:1;width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--nu-surface);border:1px solid var(--border);box-shadow:var(--nu-raised-xs);margin-bottom:3px}.upload-dropzone-label{font-size:13px;font-weight:700;color:var(--text)}.upload-dropzone-formats{font-size:11px;color:var(--text-faint)}.upload-processing{display:flex;align-items:center;gap:9px;margin-top:10px;font-size:12px;color:var(--text-muted)}.upload-file-list{display:flex;flex-direction:column;gap:8px;margin-top:12px}.upload-file-chip{display:flex;align-items:center;gap:9px;padding:8px 10px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--nu-surface);box-shadow:var(--nu-raised-xs)}.upload-file-chip-badge{flex-shrink:0;font-size:9.5px;font-weight:800;text-transform:uppercase;letter-spacing:.04em;padding:3px 7px;border-radius:5px;background:var(--nu-bg-deep);border:none;box-shadow:var(--nu-inset-xs);color:var(--primary-deep)}.upload-file-chip-name{flex:1;min-width:0;font-size:12.5px;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.upload-file-chip-size{flex-shrink:0;font-size:11px;color:var(--text-faint);font-variant-numeric:tabular-nums}.upload-file-chip-remove{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:22px;height:22px;padding:0;border:none;border-radius:7px;background:transparent;color:var(--text-faint);font-size:15px;line-height:1;cursor:pointer;font-family:inherit;transition:color var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.upload-file-chip-remove:hover{color:var(--danger);box-shadow:var(--nu-inset-xs)}.account-menu{position:relative;display:flex;align-items:center;margin-left:8px}.account-signin-btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--nu-surface);box-shadow:var(--nu-raised-xs);color:var(--text);font-family:inherit;font-size:13px;font-weight:700;padding:9px 14px;cursor:pointer;white-space:nowrap;transition:box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease)}.account-signin-btn:hover:not(:disabled){border-color:var(--primary);box-shadow:var(--nu-raised-sm);transform:translateY(-1px)}.account-signin-btn:active:not(:disabled){box-shadow:var(--nu-inset);transform:translateY(0)}.account-signin-btn:disabled{opacity:.55;cursor:default;box-shadow:var(--nu-inset-xs)}.account-signin-btn--large{font-size:15px;padding:13px 22px;border-radius:var(--radius);box-shadow:var(--nu-raised)}.account-signin-btn--large:hover:not(:disabled){box-shadow:var(--nu-raised-lg)}.account-google-icon{width:18px;height:18px;display:block}.account-avatar-btn{border:none;border-radius:50%;background:var(--nu-surface);padding:3px;cursor:pointer;line-height:0;box-shadow:var(--nu-raised-sm);transition:box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease)}.account-avatar-btn:hover{box-shadow:var(--nu-raised),0 0 0 2px #10b9814d;transform:translateY(-1px)}.account-avatar-btn:active{box-shadow:var(--nu-inset);transform:translateY(0)}.account-avatar-img,.account-avatar-fallback{width:28px;height:28px;border-radius:50%;display:block}.account-avatar-fallback{background:var(--primary);color:#fff;font-size:13px;font-weight:800;line-height:28px;text-align:center}@keyframes nu-dropdown-in{0%{opacity:0;transform:translateY(-6px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}.account-dropdown{position:absolute;top:calc(100% + 12px);right:0;z-index:40;min-width:244px;background:var(--nu-surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--nu-raised-lg);padding:8px;transform-origin:top right;animation:nu-dropdown-in .2s var(--ease-snap)}.account-dropdown-header{display:flex;flex-direction:column;gap:3px;padding:12px 12px 14px;border-bottom:1px solid var(--border);margin-bottom:8px}.account-dropdown-name{font-size:13px;font-weight:750;color:var(--text)}.account-dropdown-email{font-size:12px;font-weight:500;color:var(--text-muted);overflow-wrap:anywhere}.account-plan-badge{align-self:flex-start;margin-top:6px;border-radius:var(--radius-pill);font-size:10.5px;font-weight:800;padding:4px 11px;letter-spacing:.03em;text-transform:uppercase}.account-plan-badge--free{background:var(--nu-bg-deep);color:var(--text-muted);box-shadow:var(--nu-inset-xs)}.account-plan-badge--pro{background:var(--primary);color:#fff;box-shadow:var(--nu-accent-glow)}.account-dropdown-item{display:block;width:100%;text-align:left;border:none;background:none;font-family:inherit;font-size:13px;font-weight:650;color:var(--text);padding:10px 12px;border-radius:var(--radius-sm);cursor:pointer;transition:box-shadow var(--dur) var(--ease),color var(--dur) var(--ease)}.account-dropdown-item:hover{color:var(--primary-deep);box-shadow:var(--nu-raised-xs)}.account-dropdown-item:active{box-shadow:var(--nu-inset-xs)}.account-dropdown-item--upgrade{color:var(--primary-deep);font-weight:700}.account-dropdown-item--upgrade:hover{color:var(--primary-strong)}.account-dropdown-item--danger{color:var(--danger)}.account-dropdown-item--danger:hover{color:var(--danger);box-shadow:var(--nu-raised-xs)}.account-tabs{display:flex;gap:4px;margin:20px 0 24px;border-bottom:1px solid var(--border)}.account-tab{padding:8px 14px;font-size:13.5px;font-weight:650;color:var(--text-muted);text-decoration:none;border-bottom:2px solid transparent;margin-bottom:-1px;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}.account-tab:hover{color:var(--primary-deep)}.account-tab.active{color:var(--primary-deep);border-bottom-color:var(--primary)}.account-upgrade-card{margin-top:18px;padding:20px 22px;border:1px solid var(--border);border-radius:var(--radius);background:var(--primary-wash)}.account-upgrade-card h2{margin:0 0 8px;font-size:16.5px;font-weight:750;color:var(--text)}.account-upgrade-card p{margin:0 0 16px;font-size:14px;color:var(--text-muted);line-height:1.65}.account-upgrade-btn{text-decoration:none}.account-settings{margin-top:30px;padding-top:22px;border-top:1px solid var(--border)}.account-settings h2{margin:0 0 14px}.account-summary{margin:10px 0 26px;padding:18px 20px;border-radius:var(--radius);background:var(--nu-bg-deep);box-shadow:var(--nu-inset)}.account-summary p{margin:0 0 8px}.account-summary p:last-child{margin-bottom:0}.account-usage-hint{color:var(--text-faint);font-size:13px;font-weight:600}.account-worksheet-list{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-direction:column;gap:12px}.account-worksheet-item{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;border:1px solid var(--border);border-radius:var(--radius);background:var(--nu-surface);padding:14px 16px;box-shadow:var(--nu-raised-xs);transition:box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease)}.account-worksheet-item:hover{box-shadow:var(--nu-raised);transform:translateY(-1px)}.account-worksheet-main{display:flex;flex-direction:column;gap:4px;min-width:0}.account-worksheet-title{font-size:14px;font-weight:750;color:var(--text);overflow-wrap:anywhere}.account-worksheet-meta{font-size:12px;color:var(--text-faint)}.account-worksheet-actions{display:flex;gap:7px;flex-shrink:0}:focus-visible{outline:none;box-shadow:var(--nu-focus-ring)!important}.preview-btn:focus-visible,.worksheet-cta-btn:focus-visible{box-shadow:var(--nu-accent-glow),0 0 0 3px #04785773!important}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}.engine-loading-spinner{animation-duration:.9s!important;animation-iteration-count:infinite!important}}@media(prefers-contrast:more){:root{--text: #000000;--text-muted: #2b3a34;--text-faint: #47564f;--border: rgba(60, 80, 72, .7)}.form-input,.form-select,.form-textarea,.aqua-btn,.account-signin-btn,.preview-btn--secondary{border-color:var(--text-muted)}}@media(max-width:920px){.app-shell{padding:12px}.top-nav{margin-bottom:14px;padding:9px 14px;border-radius:var(--radius);gap:8px 4px}.top-nav-logo{height:34px}.top-nav-links{flex:1 1 0;flex-wrap:wrap;justify-content:flex-end;gap:2px 4px;row-gap:4px;min-width:0;max-width:100%}.nav-link{padding:6px 8px;font-size:12px}.account-menu{margin-left:0}.account-signin-btn{gap:6px;padding:7px 10px;font-size:12px}.account-google-icon{width:16px;height:16px}.app-window{grid-template-columns:1fr;height:auto!important;min-height:auto!important;display:flex!important;flex-direction:column!important;gap:14px;padding:14px;border-radius:var(--radius-lg)}.pane.preview-pane{height:auto!important;min-height:0!important;max-height:60vh;flex:0 1 auto!important;overflow:auto!important;scroll-margin-top:12px}.toolbar{padding:9px 10px;gap:7px;flex-shrink:0}.editor-pane{min-height:40vh;flex:1 1 auto}.viewer-viewport{padding:12px;flex:1;min-height:0;overflow:auto}.worksheet-viewer{height:clamp(320px,55vh,640px);padding:12px}.latex-page.pdf-page{border-radius:4px}.preview-generating-state{min-height:min(280px,45vh);padding:32px 12px}.mobile-loading-section{padding:4px}.mobile-error-inline{margin:0}.zoom-readout{margin-left:0;width:100%;text-align:center}.info-window,.content-card{padding:18px;border-radius:var(--radius-lg)}.account-dropdown{min-width:216px}}@media(max-width:820px){.content-grid{grid-template-columns:1fr}}@media(max-width:640px){.worksheet-sheet{padding:32px 20px;min-height:0}.worksheet-sheet-name-row{flex-direction:column;gap:10px}.worksheet-sheet-rule{min-width:100px;flex:1}}@media(max-width:600px){.legal-page{padding:26px 22px;margin:16px auto 40px;border-radius:var(--radius-lg)}.static-app-cta{padding:0 22px;margin-bottom:32px}.footer-inner{flex-direction:column;align-items:flex-start}.site-footer{padding:16px 18px}.account-worksheet-item{flex-direction:column;align-items:flex-start}.account-worksheet-actions{width:100%}.account-worksheet-actions .aqua-btn{flex:1}.editor-actions-results .preview-btn{flex:1;min-width:0}}@media print{.app-shell{background:#fff!important;padding:0!important}.app-shell:before{display:none!important}.worksheet-breadcrumb,.worksheet-meta,.worksheet-intro,.worksheet-skills,.worksheet-sheets-download,.worksheet-mistakes,.worksheet-cta,.worksheet-related,.worksheet-updated,.top-nav,.site-footer{display:none!important}.worksheet-page{max-width:none;margin:0;padding:0;border:none;box-shadow:none}.legal-page{box-shadow:none!important;background:#fff!important;margin:0;padding:0}.worksheet-sheets-wrap{margin:0}.worksheet-viewer{height:auto!important;overflow:visible!important;padding:0!important;background:transparent!important;border:none!important;box-shadow:none!important}.worksheet-sheets{gap:0;margin:0}.worksheet-sheet{max-width:none;box-shadow:none;border:none;border-radius:0;page-break-after:always;padding:.5in;min-height:0}}.pricing-page{max-width:800px}.pricing-subtitle{text-align:center;color:#475569;margin-bottom:24px;font-size:15px}.pricing-cancelled-notice{background:#fef9c3;border:1px solid #facc15;border-radius:8px;padding:10px 16px;font-size:14px;color:#854d0e;margin-bottom:24px;text-align:center}.pricing-toggle{display:flex;gap:8px;justify-content:center;margin-bottom:32px}.pricing-toggle .aqua-btn{min-width:120px;padding:8px 20px;font-size:14px;background:#f1f5f9;color:#475569}.pricing-toggle .aqua-btn--active{background:#0d9488;color:#fff}.pricing-savings-badge{font-size:12px;background:#dcfce7;color:#166534;padding:2px 6px;border-radius:4px;margin-left:4px}.pricing-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:32px}@media(max-width:600px){.pricing-grid{grid-template-columns:1fr}}.pricing-card{border:1px solid #e2e8f0;border-radius:12px;padding:28px 24px;text-align:center;display:flex;flex-direction:column;gap:12px}.pricing-card--pro{border-color:#0d9488;box-shadow:0 0 0 1px #0d9488}.pricing-card-name{font-size:18px;font-weight:600;margin:0;color:#1e293b}.pricing-card-price{font-size:36px;font-weight:700;margin:0;color:#0f172a}.pricing-card-interval{font-size:13px;color:#64748b;margin:-8px 0 4px}.pricing-feature-list{list-style:none;padding:0;margin:8px 0;text-align:left;flex:1}.pricing-feature-list li{padding:4px 0;font-size:14px;color:#334155}.pricing-feature-list li:before{content:"✓";color:#0d9488;font-weight:700}.pricing-card-btn{width:100%;margin-top:auto;padding:10px 16px;font-size:14px;font-weight:600}.pricing-card-btn--cta{background:#0d9488!important;color:#fff!important}.pricing-card-btn--cta:hover{background:#0f766e!important}.pricing-footer-note{font-size:13px;color:#64748b;text-align:center;max-width:560px;margin:0 auto}.account-subscription-info{margin-top:12px;display:flex;flex-direction:column;gap:10px}.checkout-success-box{background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;padding:12px 16px;margin-top:12px;font-size:14px;color:#166534}