:root{
  --navy:#2D3748; --orange:#F6862C; --teal:#4FD1C5; --blue:#63B3ED;
  --bg:#F7F9FC; --border:#E2E8F0; --text:#2D3748; --muted:#718096; --radius:14px;
}
*{box-sizing:border-box;}
body{margin:0;font-family:'Nunito','Segoe UI',Arial,sans-serif;color:var(--text);background:var(--bg);}
h1,h2,h3{font-family:'Poppins','Nunito',sans-serif;font-weight:800;color:var(--navy);}
a{color:inherit;text-decoration:none;}
img{max-width:100%;}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px;}
.section{padding:40px 20px;}
.accent{color:var(--orange);}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);}
.skip-link{position:absolute;left:-999px;}
.skip-link:focus{left:8px;top:8px;background:#fff;padding:8px 14px;border-radius:8px;z-index:50;}
.note{color:var(--muted);margin-top:18px;font-size:.95rem;}

/* header */
.site-header{background:#fff;border-bottom:1px solid var(--border);}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;}
.brand{display:flex;align-items:center;gap:10px;}
.brand-mark{height:44px;width:auto;}
.brand-text{display:flex;flex-direction:column;line-height:1.1;}
.brand-name{font-family:'Poppins',sans-serif;font-weight:800;font-size:1.25rem;color:var(--navy);}
.brand-tagline{font-size:.65rem;letter-spacing:1px;color:var(--muted);text-transform:uppercase;}
.main-nav{display:flex;align-items:center;gap:22px;font-weight:700;}
.main-nav > a:hover{color:var(--orange);}
.grades-menu{position:relative;}
.grades-menu summary{cursor:pointer;list-style:none;font-weight:700;}
.grades-menu summary::-webkit-details-marker{display:none;}
.grades-menu summary:after{content:" \25BE";}
.grades-dropdown{position:absolute;right:0;top:130%;background:#fff;border:1px solid var(--border);
  border-radius:10px;padding:10px;display:grid;gap:4px;min-width:220px;box-shadow:0 10px 30px rgba(0,0,0,.08);z-index:20;}
.grades-dropdown a{padding:8px 10px;border-radius:8px;font-weight:600;}
.grades-dropdown a:hover{background:var(--bg);color:var(--orange);}

/* breadcrumbs */
.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;padding-top:16px;font-size:.85rem;color:var(--muted);}
.breadcrumbs a:hover{color:var(--orange);}
.breadcrumbs span{color:#cbd5e0;}
.crumb-current{color:var(--muted);}

/* hero + search */
.hero{background:linear-gradient(135deg,#fff,#eef2ff);border-bottom:1px solid var(--border);}
.hero-inner{padding:64px 20px 56px;text-align:center;}
.hero h1{font-size:2.4rem;margin:0 0 16px;}
.hero p{font-size:1.05rem;color:var(--muted);max-width:620px;margin:0 auto 26px;}
.search{position:relative;max-width:520px;margin:0 auto;}
.search input{width:100%;padding:15px 20px;border-radius:999px;border:1px solid var(--border);
  font:inherit;font-size:1rem;box-shadow:0 6px 20px rgba(45,55,72,.06);}
.search input:focus{outline:2px solid var(--orange);border-color:transparent;}
.search-results{position:absolute;left:0;right:0;top:110%;background:#fff;border:1px solid var(--border);
  border-radius:12px;list-style:none;margin:0;padding:6px;text-align:left;z-index:30;
  box-shadow:0 14px 34px rgba(45,55,72,.12);max-height:340px;overflow:auto;}
.search-results a{display:block;padding:10px 12px;border-radius:8px;}
.search-results a:hover{background:var(--bg);}
.search-results strong{display:block;font-size:.95rem;}
.search-results span{font-size:.78rem;color:var(--muted);}

.btn{display:inline-block;padding:14px 26px;border-radius:999px;font-weight:800;}
.btn-primary{background:var(--orange);color:#fff;}
.btn-primary:hover{background:#e0741d;}
.btn-ghost{background:#fff;border:2px solid var(--border);color:var(--navy);}
.btn-ghost:hover{border-color:var(--orange);color:var(--orange);}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 10px;}

/* grids */
.grid{display:grid;gap:18px;}
.grade-grid{grid-template-columns:repeat(auto-fill,minmax(210px,1fr));}
.card-grid{grid-template-columns:repeat(auto-fill,minmax(215px,1fr));}
.grade-tile{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;
  text-align:center;transition:transform .15s,box-shadow .15s;}
.grade-tile:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(45,55,72,.08);}
.grade-tile h3{margin:0 0 6px;font-size:1.1rem;}
.grade-tile span{color:var(--muted);font-size:.88rem;font-weight:600;}

.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  display:block;transition:transform .15s,box-shadow .15s;}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(45,55,72,.1);}
.card-thumb{aspect-ratio:8.5/11;background:#f1f3f8;overflow:hidden;border-bottom:1px solid var(--border);}
.card-thumb img{width:100%;height:100%;object-fit:cover;object-position:top;}
.card-body{padding:14px 16px;}
.card-body h3{font-size:1rem;margin:6px 0 4px;line-height:1.3;}
.card-meta{color:var(--muted);font-size:.85rem;font-weight:600;}
.card-key{display:inline-block;margin-top:6px;font-size:.72rem;font-weight:700;color:var(--teal);}
.std{display:inline-block;margin-left:8px;font-size:.72rem;font-weight:700;color:var(--blue);}
.tag{display:inline-block;font-size:.7rem;font-weight:800;letter-spacing:.5px;text-transform:uppercase;
  color:var(--orange);background:#fff3e6;padding:4px 10px;border-radius:999px;}

/* pills */
.pill-row{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 4px;}
.pill{background:#e6f6ff;color:#2b6cb0;font-weight:700;font-size:.78rem;padding:6px 12px;border-radius:999px;}
.pill-muted{background:#edf2f7;color:var(--muted);font-weight:600;}

/* worksheet detail */
.worksheet-detail-grid{display:grid;grid-template-columns:380px 1fr;gap:44px;align-items:start;}
.worksheet-preview img{width:100%;height:auto;border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:0 12px 30px rgba(45,55,72,.1);background:#fff;}
.worksheet-info h1{font-size:1.75rem;margin:12px 0 10px;line-height:1.25;}
.worksheet-info p{color:var(--muted);line-height:1.65;}
.directions{background:#fff;border-left:4px solid var(--teal);padding:12px 16px;border-radius:8px;color:var(--text);}
.fine-print{font-size:.82rem;}
.facts{width:100%;border-collapse:collapse;margin-top:22px;font-size:.9rem;background:#fff;
  border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;}
.facts th,.facts td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--border);}
.facts th{width:42%;color:var(--muted);font-weight:700;}
.facts tr:last-child th,.facts tr:last-child td{border-bottom:none;}
.back-link{margin-top:20px;font-weight:700;}
.back-link a:hover{color:var(--orange);}

.page-header p{color:var(--muted);max-width:720px;line-height:1.6;}
.static-content{max-width:760px;line-height:1.75;}
.static-content h2{margin-top:30px;}
.static-content li{margin-bottom:6px;}
.band{background:#fff;border-top:1px solid var(--border);border-bottom:1px solid var(--border);}
.band p{color:var(--muted);max-width:760px;line-height:1.7;}

/* footer */
.site-footer{background:var(--navy);color:#cbd5e0;margin-top:40px;}
.footer-inner{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;padding:44px 20px;}
.footer-col h4{color:#fff;font-size:.85rem;text-transform:uppercase;letter-spacing:.5px;margin:0 0 12px;}
.footer-col a{display:block;padding:4px 0;color:#cbd5e0;}
.footer-col a:hover{color:var(--orange);}
.footer-col p{line-height:1.6;font-size:.9rem;}
.footer-brand{color:#fff;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:16px 20px;font-size:.8rem;color:#a0aec0;}

@media (max-width:720px){
  .header-inner{flex-direction:column;gap:10px;align-items:flex-start;}
  .worksheet-detail-grid{grid-template-columns:1fr;gap:24px;}
  .footer-inner{grid-template-columns:1fr 1fr;}
  .card-grid{grid-template-columns:repeat(auto-fill,minmax(148px,1fr));gap:12px;}
  .card-body{padding:10px 12px;}
  .card-body h3{font-size:.88rem;}
  .grade-grid{grid-template-columns:1fr 1fr;}
  .hero h1{font-size:1.75rem;}
  .hero-inner{padding:44px 16px;}
}
@media print{
  .site-header,.site-footer,.breadcrumbs,.search,.btn-row{display:none;}
}