/* Open Survey — opensurvey3d.com */
:root {
  --bg: #fafaf7;
  --surface: #ffffff;
  --ink: #1f2933;
  --ink-soft: #52606d;
  --line: #e4e7e4;
  --accent: #d9480f;
  --accent-soft: #fff0e6;
  --green: #2f6f4f;
  --green-soft: #e8f2ec;
  --max: 72rem;
  --max-prose: 44rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: #eef1ee;
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

pre {
  background: #1f2933;
  color: #e4e7e4;
  padding: 1rem 1.25rem;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
}
pre code { background: none; padding: 0; color: inherit; }

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.logo:hover { text-decoration: none; }
.logo svg { display: block; }
.site-nav { margin-left: auto; display: flex; gap: 1.25rem; flex-wrap: wrap; }
.site-nav a { color: var(--ink-soft); font-weight: 500; font-size: 0.95rem; }
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav a.active { color: var(--accent); }

/* Hero */
.hero {
  background:
    radial-gradient(ellipse at 20% -20%, var(--green-soft), transparent 55%),
    radial-gradient(ellipse at 90% 10%, var(--accent-soft), transparent 50%),
    var(--surface);
  border-bottom: 1px solid var(--line);
}
.hero .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.5rem 1.25rem 4rem;
  text-align: center;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 auto 1rem;
  max-width: 46rem;
}
.hero .tagline {
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 40rem;
  margin: 0 auto 2rem;
}
.badge {
  display: inline-block;
  background: var(--green-soft);
  color: var(--green);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.cta-row { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #c03d0a; text-decoration: none; }
.btn-secondary { background: var(--surface); color: var(--ink); border: 1px solid var(--line); }
.btn-secondary:hover { border-color: var(--ink-soft); text-decoration: none; }

/* Sections */
.section { max-width: var(--max); margin: 0 auto; padding: 3.5rem 1.25rem; }
.section > h2 {
  font-size: 1.75rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
}
.section > .section-sub { color: var(--ink-soft); margin: 0 0 2rem; max-width: var(--max-prose); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: 1.25rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.4rem 1.5rem;
}
.card h3 { margin: 0 0 0.5rem; font-size: 1.1rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: 0.97rem; }

/* Article cards */
.article-card { display: flex; flex-direction: column; }
.article-card .meta { font-size: 0.82rem; color: var(--ink-soft); margin-bottom: 0.4rem; }
.article-card h3 a { color: var(--ink); }
.article-card h3 a:hover { color: var(--accent); text-decoration: none; }
.article-card .more { margin-top: auto; padding-top: 0.75rem; font-size: 0.92rem; font-weight: 600; }

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  background: var(--surface);
}
th, td {
  border: 1px solid var(--line);
  padding: 0.6rem 0.85rem;
  text-align: left;
  vertical-align: top;
}
th { background: var(--green-soft); font-weight: 600; }
.table-wrap { overflow-x: auto; }

/* Prose (article body) */
.prose {
  max-width: var(--max-prose);
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}
.prose header { margin-bottom: 2.25rem; }
.prose h1 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}
.prose .meta { color: var(--ink-soft); font-size: 0.92rem; }
.prose h2 { font-size: 1.45rem; margin: 2.25rem 0 0.75rem; letter-spacing: -0.01em; }
.prose h3 { font-size: 1.15rem; margin: 1.75rem 0 0.5rem; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li { margin: 0.35rem 0; }
.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 1.25rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  background: var(--surface);
}
.prose img { max-width: 100%; height: auto; border-radius: 8px; }

/* CTA box inside articles */
.cta-box {
  background: var(--green-soft);
  border: 1px solid #cfe3d8;
  border-radius: 10px;
  padding: 1.4rem 1.6rem;
  margin: 2.5rem 0 0;
}
.cta-box h2, .cta-box h3 { margin-top: 0; }
.cta-box p:last-child { margin-bottom: 0; }

/* Breadcrumb */
.crumbs { font-size: 0.88rem; color: var(--ink-soft); margin-bottom: 1.5rem; }
.crumbs a { color: var(--ink-soft); }

/* FAQ */
.faq-item { border-bottom: 1px solid var(--line); padding: 1.25rem 0; }
.faq-item h3 { margin: 0 0 0.5rem; font-size: 1.1rem; }
.faq-item p { margin: 0; color: var(--ink-soft); }

/* Footer */
.site-footer {
  background: #1f2933;
  color: #9aa5b1;
  margin-top: 3rem;
  font-size: 0.92rem;
}
.site-footer .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  justify-content: space-between;
}
.site-footer h4 { color: #e4e7e4; margin: 0 0 0.6rem; font-size: 0.95rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 0.3rem 0; }
.site-footer a { color: #9aa5b1; }
.site-footer a:hover { color: #fff; }
.site-footer .fineprint {
  border-top: 1px solid #323f4b;
  padding: 1.25rem;
  text-align: center;
  font-size: 0.82rem;
}

@media (max-width: 640px) {
  .hero .inner { padding: 3rem 1.25rem 2.75rem; }
  .site-nav { gap: 0.9rem; }
}