@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root{
  --ink:#102a43; --muted:#627d98; --line:#d9e2ec; --bg:#f7f9fc;
  --accent:#1769aa; --accent2:#0b4f8a; --white:#fff;
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,Arial,sans-serif;color:var(--ink);background:var(--white);line-height:1.6}
a{color:inherit;text-decoration:none}.container{width:min(1120px,92%);margin:auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{height:72px;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:1.15rem;font-weight:800;letter-spacing:.04em}.logo span{color:var(--accent)}
nav{display:flex;gap:28px;font-size:.92rem;font-weight:600}nav a:hover{color:var(--accent)}
.menu-toggle{display:none;background:none;border:0;font-size:1.5rem}
.hero{min-height:650px;display:flex;align-items:center;background:
 radial-gradient(circle at 85% 20%,#dbeeff 0 12%,transparent 35%),
 linear-gradient(135deg,#f8fbff,#eef5fb)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:70px;align-items:center}
.eyebrow{font-size:.78rem;font-weight:800;letter-spacing:.16em;color:var(--accent);margin:0 0 12px}
h1{font-size:clamp(2.4rem,5vw,4.7rem);line-height:1.03;margin:0 0 22px;letter-spacing:-.055em}
h1 span{color:#8fb7d9}h2{font-size:clamp(2rem,4vw,3rem);line-height:1.1;margin:0 0 15px;letter-spacing:-.035em}
h3{margin:8px 0;font-size:1.15rem}.lead,.section-intro{font-size:1.08rem;color:var(--muted);max-width:650px}
.hero-actions{display:flex;gap:12px;margin-top:30px}.btn{padding:13px 20px;border-radius:10px;font-weight:700;border:1px solid var(--line)}
.primary{background:var(--accent);color:white;border-color:var(--accent)}.primary:hover{background:var(--accent2)}
.secondary{background:white}
.hero-card{height:390px;border-radius:28px;background:#0d2844;position:relative;overflow:hidden;box-shadow:0 25px 70px rgba(16,42,67,.2)}
.orb{position:absolute;border:1px solid rgba(255,255,255,.28);border-radius:50%}.orb1{width:330px;height:330px;right:-100px;top:-70px}.orb2{width:230px;height:230px;left:-70px;bottom:-80px}
.formula{position:absolute;top:105px;left:45px;color:white;font-size:2.4rem;font-weight:700;transform:rotate(-5deg)}
.terminal{position:absolute;left:45px;bottom:55px;color:#b8d9f4;font-family:monospace;font-size:1rem}
.section{padding:100px 0}.alt{background:var(--bg)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:35px}
.card{padding:28px;border:1px solid var(--line);border-radius:18px;background:white;transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(16,42,67,.09)}
.icon{font-size:2rem;margin-bottom:15px}.card p{color:var(--muted);margin-bottom:0}
.grade-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:35px}
.grade{padding:30px 20px;border-radius:18px;background:#102a43;color:white;font-size:3rem;font-weight:800;text-align:center}
.grade:hover{background:var(--accent)}.grade small{display:block;font-size:.7rem;letter-spacing:.14em;color:#b8d9f4}
.tutorial-list{margin-top:30px;border-top:1px solid var(--line)}
.tutorial-list>div{padding:24px 0;border-bottom:1px solid var(--line)}
.tutorial-list span{font-size:.7rem;font-weight:800;letter-spacing:.15em;color:var(--accent)}
.tutorial-list h3{font-size:1.3rem}
.tutorial-list p{margin:0;color:var(--muted)}
footer{background:#0d2844;color:white;padding:28px 0}.footer-inner{display:flex;justify-content:space-between;gap:20px;font-size:.85rem}.footer-inner span{color:#b8d9f4}
@media(max-width:800px){
 nav{display:none}.menu-toggle{display:block}.hero{min-height:auto;padding:80px 0}.hero-grid{grid-template-columns:1fr;gap:40px}.hero-card{height:300px}
 .cards{grid-template-columns:1fr}.grade-grid{grid-template-columns:repeat(2,1fr)}.section{padding:70px 0}.footer-inner{flex-direction:column}
}

/* =========================================================
   TOP COMPUTERS — WORKSHEET SYSTEM
   One shared component system for all printable generators.
   ========================================================= */
.worksheet-wrap{max-width:980px;margin-top:30px}
.worksheet-controls{
  display:flex;gap:12px;flex-wrap:wrap;align-items:center;
  padding:18px;border:1px solid var(--line);border-radius:16px;
  background:#fff
}
.worksheet-controls label{margin:0;font-weight:700}
.worksheet-controls select,.worksheet-controls input{
  width:auto;min-width:95px;padding:10px 11px;
  border:1px solid #bcccdc;border-radius:9px;font:inherit
}
.worksheet-controls button{
  padding:11px 16px;border:0;border-radius:9px;
  background:var(--accent);color:#fff;font-weight:800;cursor:pointer
}
.worksheet-controls button.secondary{
  background:#fff;color:var(--ink);border:1px solid var(--line)
}
.worksheet-sheet{
  background:#fff;border:1px solid var(--line);border-radius:18px;
  padding:38px;margin-top:24px
}
.worksheet-header{
  text-align:center;border-bottom:2px solid var(--ink);
  padding-bottom:18px;margin-bottom:25px
}
.worksheet-header h2{font-size:1.7rem;margin:0}
.worksheet-header p{margin:3px 0 0;color:var(--muted)}
.worksheet-student{display:flex;gap:30px;margin:18px 0 28px;align-items:center}
.worksheet-line{border-bottom:1px solid #777;flex:1;min-width:80px}
.worksheet-part{margin:28px 0}
.worksheet-part h3{
  font-size:1.08rem;border-bottom:1px solid var(--line);
  padding-bottom:8px;margin-bottom:15px
}
.worksheet-tasks{
  display:grid;
  grid-template-columns:repeat(var(--worksheet-columns,2),minmax(0,1fr));
  gap:15px 35px
}
.worksheet-task{font-size:1.12rem;min-height:32px}
.worksheet-blank{
  display:inline-block;width:70px;border-bottom:1px solid #555;margin:0 5px
}
.frac{
  display:inline-flex;flex-direction:column;vertical-align:middle;
  text-align:center;line-height:1.05;min-width:28px
}
.frac .top{border-bottom:1px solid currentColor;padding:0 4px}
.frac .bottom{padding:0 4px}
.worksheet-hidden{display:none!important}

/* Screen: user can still see all controls. Print uses exactly the chosen number. */
@media(max-width:600px){
  .worksheet-tasks{grid-template-columns:1fr}
  .worksheet-student{gap:12px;flex-wrap:wrap}
}
@media print{
  .site-header,.worksheet-intro,.worksheet-controls,.worksheet-note{display:none!important}
  body{background:#fff}
  .section{padding:0}
  .container{width:100%}
  .worksheet-sheet{
    border:0;margin:0;padding:10mm;border-radius:0
  }
  body.tc-columns-1 .worksheet-tasks{grid-template-columns:1fr!important}
  body.tc-columns-2 .worksheet-tasks{grid-template-columns:repeat(2,minmax(0,1fr))!important}
  body.tc-columns-3 .worksheet-tasks{grid-template-columns:repeat(3,minmax(0,1fr))!important}
}