/* 小學生科學站 */
:root{
  --bg:#fff8ef;
  --card:#ffffff;
  --ink:#1f2937;
  --muted:#6b7280;
  --brand:#2563eb;
  --brand2:#f59e0b;
  --ok:#16a34a;
  --bad:#dc2626;
  --shadow:0 10px 30px rgba(31,41,55,.08);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;
  background:radial-gradient(circle at top left,#dbeafe 0,#fff8ef 45%,#fef3c7 100%);
  color:var(--ink);line-height:1.7;min-height:100vh;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:980px;margin:0 auto;padding:20px 16px 64px}
.top{
  display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  margin-bottom:22px;
}
.brand{
  display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.25rem;color:var(--ink);
}
.logo{
  width:42px;height:42px;border-radius:14px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--brand),#60a5fa);color:#fff;font-size:1.3rem;
  box-shadow:var(--shadow);
}
.nav{display:flex;flex-wrap:wrap;gap:8px}
.nav a{
  background:#fff;border:1px solid #e5e7eb;padding:8px 12px;border-radius:999px;
  color:var(--ink);font-size:.92rem;box-shadow:0 2px 8px rgba(0,0,0,.04);
}
.nav a:hover{border-color:#93c5fd;text-decoration:none}
.hero{
  background:linear-gradient(135deg,#1d4ed8,#3b82f6 55%,#fbbf24);
  color:#fff;border-radius:28px;padding:28px 24px;box-shadow:var(--shadow);margin-bottom:24px;
}
.hero h1{margin:0 0 8px;font-size:clamp(1.6rem,4vw,2.3rem);line-height:1.25}
.hero p{margin:0;opacity:.95;font-size:1.05rem}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.card{
  background:var(--card);border-radius:var(--radius);padding:18px 16px;box-shadow:var(--shadow);
  border:1px solid #f3f4f6;transition:transform .15s ease, box-shadow .15s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:0 16px 36px rgba(31,41,55,.12);text-decoration:none}
.card .emoji{font-size:2rem;display:block;margin-bottom:8px}
.card h2{margin:0 0 6px;font-size:1.15rem;color:var(--ink)}
.card p{margin:0;color:var(--muted);font-size:.95rem}
.panel{
  background:var(--card);border-radius:24px;padding:22px 18px;box-shadow:var(--shadow);
  border:1px solid #f3f4f6;margin-bottom:18px;
}
.panel h1{margin-top:0;font-size:clamp(1.5rem,3.5vw,2rem)}
.panel h2{font-size:1.2rem;color:#1d4ed8;margin-top:1.4em}
.tip{
  background:#ecfdf5;border:1px solid #a7f3d0;border-radius:16px;padding:12px 14px;margin:14px 0;
}
.tip strong{color:#047857}
.quiz{
  background:#eff6ff;border:1px solid #bfdbfe;border-radius:16px;padding:14px;margin-top:18px;
}
.quiz h2{margin-top:0;color:#1e40af}
.q{margin:14px 0;padding-bottom:10px;border-bottom:1px dashed #bfdbfe}
.q:last-of-type{border-bottom:0}
.q label{display:block;margin:6px 0;cursor:pointer}
button.primary{
  background:var(--brand);color:#fff;border:0;border-radius:12px;padding:10px 16px;
  font-weight:700;cursor:pointer;font-size:1rem;
}
button.primary:hover{filter:brightness(1.05)}
.result{margin-top:12px;font-weight:700}
.result.ok{color:var(--ok)}
.result.bad{color:var(--bad)}
.footer{margin-top:28px;color:var(--muted);font-size:.9rem;text-align:center}
.back{display:inline-block;margin-bottom:12px}
@media (max-width:600px){
  .hero{padding:22px 16px;border-radius:22px}
}