:root {
  --navy: #111827;
  --slate: #1f2937;
  --muted: #475569;
  --line: #e2e8f0;
  --bg-alt: #f8fafc;
  --accent: #fbbf24;
  --accent-dark: #b45309;
  --text: #111827;
  --radius: 12px;
  --max: 1120px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: #fff; }
img, svg { max-width: 100%; height: auto; display: block; }
a { color: #1d4ed8; }
a:hover { color: #1e3a8a; }
h1, h2, h3 { line-height: 1.2; }
h1 { font-size: clamp(2rem, 4vw, 2.9rem); margin: 0 0 1rem; }
h2 { font-size: clamp(1.4rem, 2.5vw, 1.8rem); margin: 2rem 0 .75rem; }
h3 { font-size: 1.15rem; margin: 0 0 .5rem; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }
.narrow { max-width: 760px; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--navy); padding: .5rem 1rem; z-index: 10; }
.skip-link:focus { left: 1rem; }
:focus-visible { outline: 3px solid var(--accent-dark); outline-offset: 2px; }

/* Header */
.site-header { background: var(--navy); color: #fff; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-top: .8rem; padding-bottom: .8rem; }
.logo { display: inline-flex; align-items: center; gap: .5rem; color: #fff; text-decoration: none; font-size: 1.3rem; margin: 0; }
.logo strong { color: var(--accent); }
.logo:hover { color: #fff; }
.nav { list-style: none; display: flex; flex-wrap: wrap; gap: .25rem 1.25rem; margin: 0; padding: 0; }
.nav a { color: #e2e8f0; text-decoration: none; font-weight: 500; padding: .3rem 0; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a[aria-current="page"] { color: #fff; border-color: var(--accent); }

/* Hero */
.hero { background: radial-gradient(ellipse at 70% 10%, #374151 0%, var(--navy) 65%); color: #fff; }
.hero-inner { display: grid; grid-template-columns: 1.1fr 1fr; gap: 2rem; align-items: center; padding-top: 4rem; padding-bottom: 4rem; }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: .08em; font-weight: 700; font-size: .85rem; margin: 0 0 .5rem; }
.lead { font-size: 1.15rem; color: var(--muted); }
.hero .lead { color: #cbd5e1; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }
.hero .btn-ghost { color: #fff; border-color: #94a3b8; }

/* Buttons */
.btn { display: inline-block; background: var(--accent); color: var(--navy); font-weight: 700; padding: .75rem 1.3rem; border-radius: 999px; text-decoration: none; border: 2px solid var(--accent); }
.btn:hover { background: #fcd34d; color: var(--navy); }
.btn-ghost { background: transparent; color: var(--navy); border-color: var(--line); }
.btn-ghost:hover { background: rgba(251, 191, 36, .18); }
.text-link { font-weight: 600; text-decoration: none; }

/* Sections */
.section { padding: 2.5rem 0; }
.section-alt { background: var(--bg-alt); }
.section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.page-head { padding: 1.5rem 0 1rem; }
.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* Cards */
.card { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; display: flex; flex-direction: column; }
.card-media img { width: 100%; }
.card-body { padding: 1.25rem; display: flex; flex-direction: column; gap: .5rem; flex: 1; }
.card-body p { margin: 0 0 .5rem; color: var(--muted); }
.card-body h3 a { color: var(--text); text-decoration: none; }
.card-body h3 a:hover { color: #1d4ed8; }
.card-body .btn, .card-body .text-link { margin-top: auto; align-self: flex-start; }

.features { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.features li { background: #fff; border: 1px solid var(--line); border-top: 4px solid var(--accent); border-radius: var(--radius); padding: 1.25rem; }
.features h3 { margin: 0 0 .4rem; }
.features p { margin: 0; color: var(--muted); }
.hero-art { justify-self: center; }

details { border-bottom: 1px solid var(--line); padding: .9rem 0; }
summary { cursor: pointer; font-weight: 600; }
details p { color: var(--muted); }

/* Breadcrumbs */
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: .4rem; padding: 0; margin: 1.25rem 0 0; font-size: .9rem; color: var(--muted); }
.breadcrumbs li + li::before { content: "›"; margin-right: .4rem; }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .97rem; }
th, td { text-align: left; padding: .65rem .8rem; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--bg-alt); }
.specs th { width: 38%; color: var(--muted); font-weight: 600; }

.checklist { padding-left: 1.2rem; }
.checklist li { margin-bottom: .35rem; }
.callout { background: #fffbeb; border: 1px solid #fcd34d; border-radius: var(--radius); padding: 1.25rem 1.5rem; margin: 1rem 0; }
.callout h2 { margin-top: 0; }

/* Articles */
.prose { max-width: 760px; padding: 1rem 0 1rem; }
.prose .meta { color: var(--muted); font-size: .95rem; }
.prose li { margin-bottom: .35rem; }

/* Footer */
.site-footer { background: var(--navy); color: #cbd5e1; margin-top: 3rem; font-size: .95rem; }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 2rem; padding-top: 2.5rem; padding-bottom: 1.5rem; }
.site-footer h2 { color: #fff; font-size: 1rem; margin: 0 0 .75rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: .4rem; }
.site-footer a { color: #e2e8f0; text-decoration: none; }
.site-footer a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid #334155; padding-top: 1rem; padding-bottom: 1.5rem; font-size: .85rem; color: #94a3b8; }
.footer-bottom p { margin: .25rem 0; }
.footer-bottom a { color: #e2e8f0; }
.affiliate-note { color: #cbd5e1; }

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-inner { padding-top: 2.5rem; padding-bottom: 2.5rem; }
  .grid-3, .features { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .features, .footer-grid { grid-template-columns: 1fr; }
}

/* Tools */
[hidden] { display: none !important; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.tool-head { max-width: 760px; padding: 1rem 0 .5rem; }
.tool { border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; margin: 1rem 0 2rem; background: var(--bg-alt); }
.tool h2 { margin-top: 0; }
.tool-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 1.5rem; }
.tool-form h3 { margin: 1.25rem 0 .5rem; font-size: 1.05rem; }
.field { display: flex; flex-direction: column; gap: .3rem; margin-bottom: .9rem; min-width: 0; }
.field label { font-weight: 600; }
.field input, .field select { font: inherit; padding: .6rem .7rem; border: 1px solid #94a3b8; border-radius: 8px; background: #fff; min-height: 44px; width: 100%; }
.field-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0 1rem; }
.hint { color: var(--muted); font-size: .85rem; }
.form-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: .5rem; }
button.btn { font: inherit; font-weight: 700; cursor: pointer; min-height: 44px; }
button.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-small { padding: .45rem .9rem; font-size: .9rem; }
.form-errors { background: #fef2f2; border: 1px solid #fca5a5; border-radius: 8px; padding: .75rem 1rem .75rem 2rem; color: #7f1d1d; }
div.form-errors { padding-left: 1rem; }
.checks, .check-line { display: flex; flex-direction: column; gap: .4rem; margin: 1rem 0; }
.checks input, .check-line input { width: 1.1rem; height: 1.1rem; margin-right: .4rem; vertical-align: middle; }
.checks { align-items: flex-start; text-align: left; }
.results:empty { display: none; }
.results { margin-top: 1.5rem; }
.results:focus { outline: none; }
.ok { color: #166534; font-weight: 600; }
.warn { color: #9a3412; font-weight: 600; }
.results-table td { font-variant-numeric: tabular-nums; text-align: right; }
.results-table tr.highlight { background: #fffbeb; font-weight: 700; }

@media (max-width: 900px) {
  .tool-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .tool { padding: 1rem .75rem; }
  .results-table th, .results-table td { padding: .55rem .5rem; }
}

.formula { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: var(--bg-alt); border-left: 4px solid var(--accent); padding: .75rem 1rem; overflow-x: auto; }
.results h2 { margin-top: 0; }