:root{--bg:#eef0f4;--card:#ffffff;--text:#162338;--muted:#5c6b80;--teal:#107b74;--teal-2:#1fb7aa;--blue:#2f66e3;--blue-2:#66a2f2;--orange:#f68a2f;--orange-2:#f9a33e;--border:#d8dfe8;--shadow:0 10px 25px rgba(22,35,56,0.06);--sheet-paper-width:8.5in;--sheet-paper-height:11in;--sheet-paper-padding-top:0.35in;--sheet-paper-padding-inline:0.4in;--sheet-paper-padding-bottom:0.25in}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto}button,input,select{font:inherit}.container{width:min(1520px,calc(100% - 48px));margin:0 auto}.site-header{background:var(--teal);border-bottom:4px solid #0f5f5a}.site-header-inner{min-height:92px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-size:28px;font-weight:800;color:white}.nav-links{display:flex;gap:28px;flex-wrap:wrap}.nav-link{color:white;font-size:18px;font-weight:700}.hero{padding:56px 0 28px}.hero-panel{display:grid;grid-template-columns:1.2fr .5fr;grid-gap:0;gap:0;align-items:center}.hero h1{margin:0 0 18px;font-size:clamp(44px,6vw,78px);line-height:.95;letter-spacing:-.03em}.hero p{color:var(--muted);font-size:18px;line-height:1.5;max-width:900px}.hero-actions{display:grid;grid-template-columns:repeat(3,minmax(220px,1fr));grid-gap:22px;gap:22px;margin-top:30px}.cta{border-radius:28px;padding:10px 28px;font-weight:800;font-size:22px;color:white;box-shadow:var(--shadow);display:block;text-align:left}.cta-green{background:linear-gradient(90deg,var(--teal),var(--teal-2))}.cta-blue{background:linear-gradient(90deg,var(--blue),var(--blue-2))}.cta-orange{background:linear-gradient(90deg,var(--orange),var(--orange-2))}.hero-illustration{display:flex;justify-content:center;align-items:center}.hero-clipart{width:min(100%,500px);max-height:500px;object-fit:contain}.section{padding:26px 0 60px}.hub-layout{display:grid;grid-template-columns:380px 1fr;grid-gap:26px;gap:26px;align-items:start}.panel{background:var(--card);border:1px solid var(--border);border-radius:28px;padding:24px;box-shadow:var(--shadow)}.panel h2,.panel h3{margin:0 0 20px}.filter-section{display:grid;grid-gap:18px;gap:18px}.field label{display:block;font-size:14px;font-weight:800;margin-bottom:8px;color:var(--text)}.field input,.field select{width:100%;border:1px solid #bcc9d8;background:#f8fafc;border-radius:14px;padding:14px 16px}.helper{margin-top:8px;font-size:13px;color:var(--muted);line-height:1.4}.filter-chips{display:flex;flex-wrap:wrap;gap:10px}.chip{border:1px solid #c7d6e0;background:#eef7f6;color:var(--teal);border-radius:999px;padding:9px 14px;font-weight:700;cursor:pointer}.clear-button,.primary-button,.secondary-button,.share-button{border:0;cursor:pointer;border-radius:16px;padding:12px 18px;font-weight:800}.clear-button{background:#edf2f7;color:var(--text);width:100%}.primary-button{background:var(--teal);color:white}.secondary-button{background:white;color:var(--text);border:1px solid var(--border)}.share-button{background:#edf6ff;color:var(--blue)}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:22px;gap:22px}.card{background:var(--card);border:1px solid var(--border);border-radius:28px;overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;min-width:0;height:100%}.card-body{padding:18px}.card-title{margin:0 0 10px;font-size:18px;line-height:1.25}.card-meta{margin:0;color:var(--muted);font-size:14px}.preview{background:#f8fafc;padding:18px;border-bottom:1px solid var(--border)}.preview-pdf-desktop{display:block}.preview-pdf-wrap{background:white;aspect-ratio:8.5/11;border:1px solid #d9dfe7;border-radius:6px;box-shadow:0 4px 14px rgba(22,35,56,.08);overflow:hidden}.preview-pdf-frame{width:100%;height:100%;border:0;pointer-events:none;background:white}.preview-pdf-mobile{display:none;align-items:center;gap:14px;min-height:180px;padding:18px;background:linear-gradient(145deg,#ffffff,#eef5ff);border:1px solid #d9dfe7;border-radius:20px}.preview-pdf-mobile-icon{flex:0 0 auto;width:62px;height:78px;border-radius:16px;background:linear-gradient(180deg,#ff6b57,#df4030);color:white;display:grid;place-items:center;font-size:18px;font-weight:800;letter-spacing:.06em;box-shadow:0 10px 24px rgba(223,64,48,.22)}.preview-pdf-mobile-content{min-width:0}.preview-pdf-mobile-hint,.preview-pdf-mobile-label,.preview-pdf-mobile-title{margin:0}.preview-pdf-mobile-label{color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.04em;text-transform:uppercase}.preview-pdf-mobile-title{margin-top:6px;color:var(--text);font-size:18px;font-weight:800;line-height:1.2}.preview-pdf-mobile-hint{margin-top:8px;color:var(--muted);font-size:14px;line-height:1.4}.preview-sheet{background:white;aspect-ratio:8.5/11;border:1px solid #d9dfe7;border-radius:6px;box-shadow:0 4px 14px rgba(22,35,56,.08);padding:14px;display:grid;grid-template-rows:auto auto 1fr auto;grid-gap:10px;gap:10px}.preview-header{display:flex;justify-content:space-between;font-size:10px;font-weight:700}.preview-title{text-align:center;font-size:18px;font-weight:800;margin-top:2px}.preview-subtitle{text-align:center;color:var(--muted);font-size:10px}.preview-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:8px;gap:8px;align-content:start}.preview-box{border:1px solid #c8d1dd;border-radius:10px;padding:8px;min-height:68px;font-size:12px}.preview-footer{font-size:10px}.empty-state,.preview-footer{text-align:center;color:var(--muted)}.empty-state{padding:48px 18px}.worksheet-page{padding:34px 0 60px}.worksheet-shell{display:grid;grid-template-columns:minmax(0,1fr);grid-gap:24px;gap:24px}.sheet-viewer{background:#f6f8fb;border:1px solid var(--border);border-radius:30px;padding:22px;box-shadow:var(--shadow)}.sheet-paper{width:min(100%,var(--sheet-paper-width));margin:0 auto;min-height:auto;aspect-ratio:8.5/11;background:white;border-radius:8px;border:1px solid #dfe5ee;padding:var(--sheet-paper-padding-top) var(--sheet-paper-padding-inline) var(--sheet-paper-padding-bottom);display:grid;grid-template-rows:auto auto 1fr auto;grid-gap:18px;gap:18px;overflow:hidden;align-content:stretch;print-color-adjust:exact;-webkit-print-color-adjust:exact}.sheet-name-date{display:flex;justify-content:space-between;gap:20px;font-size:18px}.sheet-line{display:inline-block;width:240px;border-bottom:2px solid #1f2937;transform:translateY(-4px)}.sheet-title{text-align:center;font-size:40px;font-weight:800;line-height:1.05}.sheet-subtitle{text-align:center;color:var(--muted);font-size:18px}.sheet-content{align-content:start}.logo-footer{text-align:center;font-size:16px;color:var(--muted);margin-top:auto}.math-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px 22px;gap:12px 22px}.activity-box,.math-problem{display:grid;grid-template-columns:auto 1fr;grid-gap:8px;gap:8px;align-items:start;font-size:22px;font-weight:700}.problem-number{min-width:30px}.problem-work{line-height:1.2}.activity-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:18px;gap:18px}.activity-card{border:2px solid #ccd7e4;border-radius:20px;padding:16px;min-height:180px}.activity-card .line{height:12px;background:#eef2f7;border-radius:999px;margin-bottom:10px}.page-actions{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}.page-actions-left,.page-actions-right{display:flex;gap:12px;flex-wrap:wrap}.footer-note{color:var(--muted);font-size:14px}.coming-soon{padding:70px 0}.coming-soon-card{max-width:860px;margin:0 auto;text-align:center}@media screen and (max-width:1200px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-panel{grid-template-columns:1fr}.hero-illustration{order:-1}}@media screen and (max-width:980px){.activity-grid,.grid,.hero-actions,.hub-layout,.math-grid{grid-template-columns:1fr}.sheet-paper{min-height:auto}.sheet-name-date{font-size:16px}.sheet-line{width:180px}.preview-pdf-desktop{display:none}.preview-pdf-mobile{display:flex}}@media print{.footer-note,.hero,.page-actions,.panel:not(.sheet-viewer),.site-header{display:none!important}body{background:white}.section,.worksheet-page{padding:0}.hub-layout,.worksheet-shell{display:block}.container,.sheet-viewer,.worksheet-page,.worksheet-shell{width:100%;margin:0;padding:0;box-shadow:none;border:0;background:white}.sheet-paper{width:var(--sheet-paper-width);height:var(--sheet-paper-height);min-height:0;margin:0 auto;border:0;box-shadow:none;border-radius:0;break-inside:avoid-page;page-break-inside:avoid}.sheet-name-date{font-size:18px}.sheet-line{width:240px}.sheet-title{font-size:40px}.sheet-subtitle{font-size:18px}.activity-grid,.math-grid{grid-template-columns:1fr 1fr!important}.math-grid{gap:12px 22px}.activity-box,.math-problem{gap:8px;font-size:22px}.problem-number{min-width:30px}.problem-work{line-height:1.2}@page{size:letter portrait;margin:0}}@media screen and (max-width:768px){.hero-panel{grid-template-columns:1fr;text-align:center}.hero-illustration{justify-content:center;margin-top:20px}}