:root {
  --bg: #faf8f5;
  --bg-muted: #f0ebe3;
  --surface: #fff;
  --text: #1c1917;
  --muted: #57534e;
  --accent: #c2410c;
  --accent-dark: #9a3412;
  --accent-soft: #ffedd5;
  --border: #e7e5e4;
  --ok: #15803d;
  --fail: #b91c1c;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "Cascadia Code", monospace;
  --radius: 8px;
  --max: 1080px;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; font-family: var(--font); font-size: 1.05rem; line-height: 1.55; color: var(--text); background: var(--bg); }
.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }
a { color: var(--accent-dark); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.skip-link { position: absolute; top: -100%; left: 1rem; background: var(--accent); color: #fff; padding: .5rem 1rem; z-index: 99; }
.skip-link:focus { top: 1rem; }

.site-header { background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 56px; }
.brand { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: inherit; font-size: 1.15rem; }
.brand-mark { display: inline-flex; width: 1.75rem; height: 1.75rem; border: 3px solid var(--accent); transform: rotate(45deg); }
.site-nav { display: flex; gap: 1.25rem; }
.site-nav a { color: var(--text); text-decoration: none; font-weight: 500; }
.site-nav a[aria-current="page"], .site-nav a:hover { color: var(--accent); }
.nav-toggle { display: none; border: 1px solid var(--border); background: var(--surface); width: 44px; height: 44px; border-radius: var(--radius); }
@media (max-width: 700px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 56px; background: var(--surface); flex-direction: column; padding: 1rem; border-bottom: 1px solid var(--border); }
  .site-nav.is-open { display: flex; }
}

.hero { padding: 2.5rem 0 1rem; background: linear-gradient(180deg, var(--accent-soft), var(--bg)); }
.hero h1 { font-size: clamp(1.85rem, 4vw, 2.6rem); line-height: 1.15; margin: 0 0 .75rem; letter-spacing: -.02em; }
.lead { color: var(--muted); max-width: 58ch; margin: 0; }

.section { padding: 2rem 0; }
.section-muted { background: var(--bg-muted); }
.page-header { padding: 2rem 0 1rem; background: var(--accent-soft); border-bottom: 1px solid var(--border); }
.prose { max-width: 65ch; padding-bottom: 2rem; }
.prose h2 { margin-top: 1.75rem; }

.planner-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: start; }
@media (max-width: 900px) { .planner-grid { grid-template-columns: 1fr; } }

.planner-form fieldset { border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.15rem; margin: 0 0 1rem; background: var(--surface); }
.planner-form legend { font-weight: 700; padding: 0 .25rem; }
.hint { font-size: .9rem; color: var(--muted); margin: .35rem 0 0; }
.dim-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin-top: .75rem; }
.dim-grid label { display: flex; flex-direction: column; gap: .25rem; font-size: .9rem; font-weight: 600; }
.dim-grid input { padding: .5rem; border: 1px solid var(--border); border-radius: var(--radius); font: inherit; }

.segments-list { display: flex; flex-direction: column; gap: .75rem; margin: .75rem 0; }
.segment-card { border: 1px solid var(--border); border-radius: var(--radius); padding: .75rem; background: var(--bg); }
.segment-card header { display: flex; justify-content: space-between; align-items: center; margin-bottom: .5rem; }
.segment-card h3 { margin: 0; font-size: .95rem; }
.segment-fields { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: .5rem; }
.segment-fields label { font-size: .8rem; font-weight: 600; display: flex; flex-direction: column; gap: .15rem; }
.segment-fields input, .segment-fields select { padding: .4rem; border: 1px solid var(--border); border-radius: 4px; font: inherit; }
.segment-add { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .5rem; }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: .6rem 1rem; border-radius: var(--radius); border: 1px solid transparent; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary { background: var(--surface); border-color: var(--border); color: var(--text); }
.btn-wide { width: 100%; margin-top: .5rem; }

.viz-wrap { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: .5rem; }
.viz-title { font-size: 1rem; margin: 0 0 .5rem; }
#plan-svg { width: 100%; height: auto; min-height: 280px; display: block; background: #fafaf9; border-radius: 4px; }
.viz-hint { margin-top: .5rem; }

.results-section.hidden { display: none; }
.results-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 1rem; margin: 1rem 0; }
@media (max-width: 800px) { .results-grid { grid-template-columns: 1fr; } }
.guide-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.guide-steps { padding-left: 1.25rem; }
.guide-steps li { margin-bottom: 1rem; }
.guide-steps strong { display: block; font-size: 1.05rem; }
.guide-steps .why { font-size: .9rem; color: var(--muted); margin-top: .25rem; }
.guide-notes { font-size: .9rem; color: var(--muted); }
.status-ok { color: var(--ok); font-weight: 700; }
.status-fail { color: var(--fail); font-weight: 700; }

.site-footer { margin-top: 2rem; padding: 2rem 0; background: #292524; color: #d6d3d1; }
.site-footer a { color: #fdba74; }
.footer-meta { font-size: .875rem; opacity: .85; }

@media print {
  .site-header, .site-footer, .planner-form-col, .planner-viz-col, .hero, .section-muted, #print-guide { display: none !important; }
  .results-section { display: block !important; }
}