:root {
  --c-bg: #f7faff;
  --c-fg: #1f2233;
  --c-muted: #65697d;
  --c-accent: #5b6fe5;
  --c-accent-hover: #4757c4;
  --c-border: #e0e6f5;
  --c-card-bg: #ffffff;
  --c-card-shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 12px rgba(0,0,0,.04);
  --max-w: 760px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --r: 10px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--c-fg);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; height: auto; display: block; }

.wrap { max-width: var(--max-w); margin: 0 auto; padding: 24px 20px; }

header.site {
  border-bottom: 1px solid var(--c-border);
  padding: 14px 20px;
  background: #fff;
}
header.site .row {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}
header.site a.brand { color: var(--c-fg); font-weight: 700; font-size: 18px; }
header.site nav a { margin-left: 16px; font-size: 14px; color: var(--c-muted); }

h1 { font-family: var(--font-serif); font-size: 34px; line-height: 1.25; margin: 24px 0 12px; }
h2 { font-size: 24px; margin: 32px 0 12px; }
h3 { font-size: 19px; margin: 22px 0 8px; }
p, ul, ol { margin: 12px 0; }
ul, ol { padding-left: 24px; }

.meta { color: var(--c-muted); font-size: 14px; margin-bottom: 16px; }

.btn {
  display: inline-block;
  background: var(--c-accent); color: #fff;
  padding: 12px 22px; border-radius: var(--r);
  font-weight: 600; font-size: 16px;
  border: none; cursor: pointer;
}
.btn:hover { background: var(--c-accent-hover); text-decoration: none; }
.btn-secondary { background: transparent; color: var(--c-accent); border: 1.5px solid var(--c-accent); }

.card {
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--r);
  box-shadow: var(--c-card-shadow);
  padding: 18px;
  margin: 16px 0;
}

.app-card {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--c-border);
  border-radius: var(--r);
  background: #fff;
  margin: 10px 0;
}
.app-card img { width: 56px; height: 56px; border-radius: 12px; }
.app-card .info { flex: 1; }
.app-card .info b { display: block; }
.app-card .info span { color: var(--c-muted); font-size: 14px; }
.app-card a.cta {
  background: var(--c-accent); color: #fff;
  padding: 8px 14px; border-radius: 8px; font-size: 14px; font-weight: 600;
}

.grid-apps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 20px 0;
}
@media (min-width: 600px) {
  .grid-apps { grid-template-columns: 1fr 1fr; }
}

.tool-form { background: #fff; border: 1px solid var(--c-border); border-radius: var(--r); padding: 18px; }
.tool-form label { display: block; margin: 12px 0 6px; font-weight: 600; font-size: 15px; }
.tool-form input[type=number],
.tool-form input[type=date],
.tool-form input[type=text],
.tool-form textarea,
.tool-form select {
  width: 100%; padding: 10px 12px; font-size: 16px;
  border: 1px solid var(--c-border); border-radius: 8px; background: #fff;
}
.tool-form textarea { min-height: 80px; resize: vertical; font-family: inherit; }
.tool-form fieldset { border: 1px solid var(--c-border); border-radius: 8px; padding: 10px 14px; margin: 10px 0; }
.tool-form legend { font-size: 14px; color: var(--c-muted); padding: 0 6px; }

.result {
  margin-top: 18px;
  padding: 18px;
  border-radius: var(--r);
  background: #eff3ff;
  border: 1px solid var(--c-border);
}
.result.hidden { display: none; }
.result h3 { margin-top: 0; }

.cta-box {
  margin: 28px 0;
  padding: 20px;
  border-radius: var(--r);
  background: linear-gradient(135deg, #fff 0%, #eff3ff 100%);
  border: 1px solid var(--c-border);
  display: flex; gap: 14px; align-items: center;
}
.cta-box img { width: 64px; height: 64px; border-radius: 14px; flex-shrink: 0; }
.cta-box .copy { flex: 1; }
.cta-box .copy b { display: block; font-size: 17px; }
.cta-box .copy span { color: var(--c-muted); font-size: 14px; }

footer.site {
  border-top: 1px solid var(--c-border);
  margin-top: 60px;
  padding: 24px 20px;
  background: #fff;
  font-size: 14px;
  color: var(--c-muted);
}
footer.site .row { max-width: var(--max-w); margin: 0 auto; }
footer.site .apps { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; }
footer.site .apps a { display: flex; align-items: center; gap: 6px; color: var(--c-fg); }
footer.site .apps img { width: 28px; height: 28px; border-radius: 6px; }
footer.site .disclaimer { font-size: 12px; line-height: 1.5; margin-top: 14px; }

.toc {
  background: #eff3ff; border-radius: var(--r); padding: 14px 18px;
  margin: 18px 0; font-size: 14px;
}
.toc b { display: block; margin-bottom: 6px; }
.toc a { display: block; padding: 3px 0; color: var(--c-fg); }

.faq-item { margin: 14px 0; }
.faq-item summary { font-weight: 600; cursor: pointer; padding: 8px 0; }
.faq-item p { margin: 6px 0 12px; }