/* Toolsped — shared stylesheet. Light theme, single blue accent #2563EB. */
:root {
  --bg: #FFFFFF;
  --surface: #F8FAFC;
  --border: #E2E8F0;
  --text: #0F172A;
  --muted: #64748B;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --on-accent: #FFFFFF;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 4px 14px rgba(15, 23, 42, .06);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px; line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
h1 { font-size: 2rem; line-height: 1.2; margin: .4em 0 .3em; }
h2 { font-size: 1.45rem; margin: 1.6em 0 .5em; padding-top: .4em; border-top: 1px solid var(--border); }
h3 { font-size: 1.15rem; margin: 1.2em 0 .4em; }
p { margin: .6em 0; }
.container { max-width: 1060px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

/* Header */
.site-header { background: var(--bg); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.header-inner { max-width: 1060px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.logo { display: flex; align-items: center; gap: 9px; font-size: 1.45rem; font-weight: 800; color: var(--text); letter-spacing: -.02em; }
.logo:hover { text-decoration: none; }
.logo-mark { width: 34px; height: 34px; border-radius: 9px; background: var(--accent); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: 1.15rem; font-weight: 800; }
.logo span b { color: var(--accent); font-weight: 800; }
.main-nav { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; }
.main-nav a { color: var(--text); font-size: .95rem; font-weight: 600; padding: 7px 11px; border-radius: 8px; }
.main-nav a:hover { background: var(--surface); color: var(--accent); text-decoration: none; }

/* Hero */
.hero { background: var(--surface); border-bottom: 1px solid var(--border); padding: 46px 0 40px; text-align: center; }
.hero h1 { font-size: 2.3rem; margin: 0 0 10px; }
.hero p { color: var(--muted); font-size: 1.12rem; max-width: 640px; margin: 0 auto 22px; }
.search-box { display: flex; max-width: 560px; margin: 0 auto; gap: 8px; }
.search-box input { flex: 1; padding: 13px 16px; font-size: 1rem; border: 2px solid var(--border); border-radius: 10px; outline: none; background: #fff; color: var(--text); }
.search-box input:focus { border-color: var(--accent); }
.btn { display: inline-block; background: var(--accent); color: var(--on-accent); font-weight: 700; font-size: 1rem; border: none; border-radius: 10px; padding: 13px 22px; cursor: pointer; }
.btn:hover { background: var(--accent-hover); text-decoration: none; }

/* Cards & grids */
.section { padding: 34px 0 10px; }
.section h2 { border-top: none; padding-top: 0; margin-top: 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.card { display: block; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); color: var(--text); }
.card:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); transition: transform .15s ease, border-color .15s ease; }
.card h3 { margin: 0 0 6px; font-size: 1.08rem; color: var(--text); }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.tag { display: inline-block; background: #EFF6FF; color: var(--accent); font-size: .78rem; font-weight: 700; border-radius: 999px; padding: 3px 10px; margin-bottom: 8px; }
.hub-card .count { color: var(--muted); font-size: .88rem; }
.why-strip { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin: 30px 0; }
.why-strip ul { margin: 8px 0 0; padding-left: 20px; }
.why-strip li { margin: 4px 0; }

/* Breadcrumbs */
.crumbs { font-size: .9rem; color: var(--muted); margin: 18px 0 0; }
.crumbs a { color: var(--muted); }

/* Tool box */
.tool-box { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; margin: 18px 0 8px; }
.tool-box label { display: block; font-weight: 700; margin: 12px 0 5px; font-size: .98rem; }
.tool-box label:first-child { margin-top: 0; }
.tool-box input[type="number"], .tool-box input[type="text"], .tool-box input[type="date"], .tool-box select, .tool-box textarea {
  width: 100%; padding: 11px 12px; font-size: 1rem; border: 1.5px solid var(--border); border-radius: 9px; background: #fff; color: var(--text); outline: none;
}
.tool-box input:focus, .tool-box select:focus, .tool-box textarea:focus { border-color: var(--accent); }
.tool-box .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.tool-box .row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }
.tool-box .hint { font-size: .88rem; color: var(--muted); margin-top: 3px; }
.result { background: #EFF6FF; border: 1.5px solid #BFDBFE; border-radius: 10px; padding: 16px 18px; margin-top: 18px; }
.result .big { font-size: 1.7rem; font-weight: 800; color: var(--accent); line-height: 1.25; }
.result .sub { color: var(--muted); font-size: .95rem; margin-top: 4px; }
.result table { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: .97rem; }
.result table td { padding: 6px 4px; border-top: 1px solid #DBEAFE; }
.result table td:last-child { text-align: right; font-weight: 700; }
.error { color: #B91C1C; font-weight: 600; font-size: .95rem; margin-top: 8px; }
.formula { background: #fff; border: 1px dashed var(--border); border-radius: 9px; padding: 12px 16px; font-family: Georgia, serif; font-style: italic; margin: 10px 0; }
table.data { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: .96rem; }
table.data th, table.data td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }
table.data th { background: var(--surface); }
details.faq { border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; margin: 10px 0; background: #fff; }
details.faq summary { font-weight: 700; cursor: pointer; }
details.faq p { margin: .5em 0 0; }
.disclaimer { background: #FFFBEB; border: 1px solid #FDE68A; border-radius: 10px; padding: 14px 18px; font-size: .94rem; margin: 22px 0; }
.related { margin: 26px 0; }
.related ul { columns: 2; padding-left: 20px; }
.related li { margin: 5px 0; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); margin-top: 44px; padding: 30px 0 36px; font-size: .94rem; color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; }
.site-footer h4 { color: var(--text); margin: 0 0 8px; font-size: 1rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 5px 0; }
.footer-note { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border); font-size: .88rem; }

@media (max-width: 640px) {
  body { font-size: 16px; }
  h1 { font-size: 1.6rem; }
  .hero h1 { font-size: 1.8rem; }
  .hero { padding: 32px 0 28px; }
  .tool-box .row, .tool-box .row3 { grid-template-columns: 1fr; }
  .related ul { columns: 1; }
  .main-nav { margin-left: 0; }
  .search-box { flex-direction: column; }
}