/* 3dprinterspool.com — educational spool category authority */
:root {
  --ink: #14221f;
  --paper: #f4f7f5;
  --card: #ffffff;
  --teal: #0d9488;
  --teal-dark: #0f766e;
  --coral: #e11d48;
  --muted: #5b6b66;
  --line: #d5e0db;
  --max: 1080px;
  --font: Georgia, "Times New Roman", serif;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; font-family: var(--sans); background: var(--paper); color: var(--ink); line-height: 1.7; }
a { color: var(--teal-dark); }
.wrap { width: min(100% - 2rem, var(--max)); margin-inline: auto; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--coral); color: #fff; padding: .5rem 1rem; z-index: 99; }
.site-header { background: var(--card); border-bottom: 2px solid var(--line); position: sticky; top: 0; z-index: 40; }
.nav { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between; padding: 1rem 0; }
.logo { font-family: var(--sans); font-weight: 800; color: var(--ink); text-decoration: none; letter-spacing: -.03em; }
.logo em { color: var(--teal); font-style: normal; }
.nav-links { display: flex; flex-wrap: wrap; gap: .75rem 1.1rem; list-style: none; margin: 0; padding: 0; font-size: .92rem; }
.nav-links a { color: var(--muted); text-decoration: none; font-weight: 600; }
.nav-links a[aria-current="page"], .nav-links a:hover { color: var(--teal-dark); }
.btn { display: inline-flex; align-items: center; padding: .7rem 1.2rem; border-radius: 8px; font-weight: 700; text-decoration: none; border: 0; }
.btn-primary { background: var(--coral); color: #fff; }
.btn-primary:hover { background: #be123c; color: #fff; }
.btn-ghost { background: transparent; border: 2px solid var(--line); color: var(--ink); }
.hero { padding: 3.5rem 0 2.5rem; border-bottom: 2px solid var(--line); background: linear-gradient(180deg, #e7f5f2, var(--paper)); }
.hero h1 { font-family: var(--font); font-size: clamp(2rem, 4vw, 2.9rem); line-height: 1.2; margin: 0 0 1rem; max-width: 18ch; }
.kicker { font-size: .8rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--teal); margin: 0 0 .75rem; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 48ch; }
.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }
.section { padding: 3rem 0; }
.section h2 { font-family: var(--font); font-size: clamp(1.45rem, 2.5vw, 1.9rem); margin: 0 0 .75rem; }
.intro { color: var(--muted); max-width: 62ch; }
.grid-2 { display: grid; gap: 1.25rem; }
.grid-3 { display: grid; gap: 1.25rem; }
@media (min-width: 720px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 1.25rem; box-shadow: 0 8px 0 rgba(13,148,136,.08); }
.card h3 { margin: 0 0 .5rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.prose ol { color: var(--muted); }
.callout { background: #ecfdf8; border-left: 4px solid var(--teal); padding: 1rem 1.15rem; border-radius: 0 10px 10px 0; color: var(--muted); }
.related { background: #fff; border: 2px dashed var(--line); border-radius: 12px; padding: 1.5rem; }
.related h2 { margin-top: 0; }
.site-footer { background: var(--ink); color: #c5d4cf; padding: 2.5rem 0; margin-top: 2rem; }
.site-footer a { color: #fff; }
.footer-grid { display: grid; gap: 1.5rem; }
@media (min-width: 700px) { .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; } }
.site-footer h3 { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: #7a9088; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: .35rem 0; }
.footer-note { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid #2a3b36; font-size: .85rem; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1rem; margin-bottom: .65rem; }
.faq summary { font-weight: 700; cursor: pointer; }
.faq p { color: var(--muted); }
.price { font-size: 1.5rem; font-weight: 800; color: var(--coral); }
table { width: 100%; border-collapse: collapse; background: var(--card); }
th, td { border: 1px solid var(--line); padding: .75rem; text-align: left; font-size: .95rem; }
th { background: #e7f5f2; }