/* ── Design Tokens ─────────────────────────────────────────────── */
:root {
  /* Cool-light palette aligned to the LK Forge brand (global.css); accent
     recolored to indigo so the Design cluster reads distinct from other
     tool clusters while staying inside the site's cool-light family. */
  --bg:        #f5f7ff;
  --surface:   #ffffff;
  --surface2:  #eceeff;
  --border:    #cdd1f0;
  --border-control: #7a7fb5; /* 3:1+ on all surfaces - WCAG 1.4.11 for controls */
  --text:      #0f0f2e;
  --muted:     #515180;
  --accent:      #4f46e5;
  --accent-h:    #4338ca;
  --accent-bg:   #eef2ff;
  --accent-fg:   #4338ca;
  --accent-light:#818cf8;
  --icon-bg:   #e0e7ff;
  --radius:    9px;
  --radius-lg: 14px;
  --shadow:    0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --shadow-lg: 0 4px 20px rgba(0,0,0,.14);
  --teal:      #059669;
  --teal-dark: #065f46;
  --green:     #2d7a4a;
  --yellow:    #b07a00;
  --purple:    #6b3fa0;
  --btn-primary:   #4f46e5;
  --btn-primary-h: #4338ca;
  --font-display: 'Orbitron', sans-serif;
  --font-body:    'Outfit', system-ui, sans-serif;
  --mono:      'JetBrains Mono', 'Courier New', Courier, monospace;
}

/* ── Reset ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); background: var(--bg); color: var(--text); line-height: 1.6; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Typography tokens ─────────────────────────────────────────── */
h1, h2, h3 { font-weight: 800; line-height: 1.2; color: var(--text); }
h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); margin-bottom: 10px; }
h2 { font-size: 1.3rem; margin-bottom: 8px; }
h3 { font-size: 1.05rem; margin-bottom: 6px; }
p { font-size: .975rem; color: var(--text); }
code, kbd, samp { font-family: var(--mono); }

/* ── Header ────────────────────────────────────────────────────── */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-logo { font-family: var(--font-display); font-size: 1.1rem; font-weight: 900; color: var(--text); letter-spacing: -.5px; text-decoration: none; margin-right: 16px; flex-shrink: 0; }

/* Family display-font rollout: headings render in Orbitron like every other
   LK Forge suite (image/css/image.css, pdf/css/pdf-suite.css do the same). */
.tool-hero h1, .page-hero h1,
.hub-card h2, .section > h2 { font-family: var(--font-display); font-weight: 900; letter-spacing: -.5px; line-height: 1.2; }

/* Skip link — first focusable element, visible only on focus. */
.skip-link { position: absolute; left: -999px; top: 0; z-index: 1000; background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 16px; font-weight: 600; text-decoration: none; }
.skip-link:focus { left: 8px; top: 8px; }
.site-nav { display: flex; align-items: center; gap: 6px; }
.nav-link {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 108px;
  font-size: .875rem;
  font-weight: 600;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  background: transparent;
  text-decoration: none;
  transition: background .18s, border-color .18s, color .18s, transform .1s;
}
.nav-link:hover { background: var(--accent); border-color: var(--accent); color: #fff; text-decoration: none; transform: translateY(-1px); }
.nav-link:active { transform: scale(.97); }
.nav-link.active { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (min-width: 680px) {
  .site-nav .nav-link { display: inline-flex; }
  .nav-hamburger { display: none; }
  .nav-mobile-menu { display: none !important; }
}
.nav-hamburger { display: flex; align-items: center; gap: 6px; background: none; border: 1px solid var(--border); cursor: pointer; padding: 6px 12px; border-radius: var(--radius); font-size: .85rem; font-weight: 600; letter-spacing: .06em; color: var(--text); transition: background .2s; min-height: 44px; }
.nav-hamburger:hover { background: rgba(0,0,0,.07); }
.nav-mobile-menu { display: none; flex-direction: column; background: var(--surface); border-bottom: 1px solid var(--border); padding: 10px 16px 14px; gap: 8px; }
.nav-mobile-menu.open { display: flex; }
.nav-mobile-link { display: block; text-align: center; text-decoration: none; font-size: 1rem; font-weight: 600; color: var(--text); background: var(--surface2); border: 1.5px solid var(--border); border-radius: var(--radius); padding: 13px 16px; transition: background .18s, border-color .18s, color .18s; }
.nav-mobile-link:hover { background: var(--accent); border-color: var(--accent); color: #fff; text-decoration: none; }
.nav-mobile-link.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.nav-mobile-sub { padding-left: 30px !important; font-size: .92em; opacity: .95; }

/* "Tools" style dropdown group in the top nav (hover + click + keyboard, desktop >= 680px) */
.nav-group { position: relative; display: none; align-items: center; }
@media (min-width: 680px) { .site-header .site-nav .nav-group { display: inline-flex; } }
.nav-group-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 4px;
  min-width: 108px; font-family: inherit; font-size: .875rem; font-weight: 600;
  padding: 8px 12px; border: 1.5px solid var(--border); border-radius: var(--radius);
  color: var(--text); background: transparent; cursor: pointer;
  transition: background .18s, border-color .18s, color .18s, transform .1s;
}
.nav-group-btn .caret { font-size: .9em; transition: transform .18s; }
.nav-group-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-1px); }
.nav-group-btn[aria-expanded="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.nav-group-btn[aria-expanded="true"] .caret { transform: rotate(180deg); }
.nav-group.is-current .nav-group-btn { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.nav-group-menu {
  display: none; position: absolute; top: 100%; left: 0; margin-top: 8px;
  flex-direction: column; gap: 2px; min-width: 210px; padding: 8px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: 0 12px 34px rgba(15,15,46,.14); z-index: 60;
}
.nav-group.open .nav-group-menu { display: flex; }
@media (hover: hover) { .nav-group:hover .nav-group-menu { display: flex; } }
.nav-group-menu a { display: block; padding: 9px 12px; border-radius: 8px; font-size: .85rem; font-weight: 600; color: var(--text); white-space: nowrap; text-decoration: none; }
.nav-group-menu a:hover { background: var(--accent); color: #fff; text-decoration: none; }
.nav-group-menu a.active { background: var(--accent); color: #fff; }

/* Priority+ overflow nav ("More" dropdown for whichever .nav-link pills don't fit) */
.nav-more { position: relative; display: none; align-items: center; }
.nav-more.is-hidden { display: none; }
.site-nav .nav-link.is-hidden { display: none; }
.nav-more-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 4px;
  font-family: inherit; font-size: .82rem; font-weight: 600;
  padding: 7px 11px; border: 1.5px solid var(--border); border-radius: var(--radius);
  color: var(--text); background: transparent; cursor: pointer; white-space: nowrap;
  transition: background .18s, border-color .18s, color .18s, transform .1s;
}
.nav-more-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-1px); }
.nav-more-btn[aria-expanded="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.nav-more-menu {
  display: none; position: absolute; right: 0; top: calc(100% + 8px);
  flex-direction: column; gap: 3px; min-width: 190px; max-height: 72vh; overflow-y: auto;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 6px; box-shadow: 0 10px 30px rgba(0,0,0,.14); z-index: 200;
}
.nav-more-menu.open { display: flex; }
.nav-more-link {
  display: block; padding: 9px 12px; border-radius: calc(var(--radius) - 2px);
  font-size: .85rem; font-weight: 600; color: var(--text); white-space: nowrap; text-decoration: none;
}
.nav-more-link:hover { background: var(--accent); color: #fff; text-decoration: none; }
.nav-more-link.active { background: var(--accent); color: #fff; }
@media (max-width: 679.98px) {
  .nav-more { display: none !important; }
}
@media (min-width: 680px) {
  .site-nav { flex: 1 1 auto; min-width: 0; flex-wrap: wrap; }
  .site-header .nav-hamburger { display: none !important; }
  .site-header .site-nav .nav-link { display: inline-flex !important; }
  .site-header .site-nav .nav-link.is-hidden { display: none !important; }
  .site-nav .nav-more { display: inline-flex !important; }
  .site-nav .nav-more.is-hidden { display: none !important; }
}

/* ── Layout ────────────────────────────────────────────────────── */
.container { max-width: 860px; margin: 0 auto; padding: 0 20px; }
.page-main { padding: 36px 0 72px; }

/* ── Buttons ───────────────────────────────────────────────────── */
.btn-primary {
  font-family: inherit;
  font-size: .95rem;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  padding: 12px 24px;
  cursor: pointer;
  transition: background .15s;
  white-space: nowrap;
}
.btn-primary:hover { background: var(--accent-h); }
.btn { display: inline-block; padding: 10px 20px; border-radius: var(--radius); font-family: inherit; font-size: .9rem; font-weight: 700; cursor: pointer; border: none; transition: background .15s; }
.btn-sm { padding: 8px 16px; font-size: .85rem; }
.btn-outline { background: transparent; color: var(--accent); border: 2px solid var(--accent); } .btn-outline:hover { background: var(--accent); color: #fff; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; }

/* ── Footer ────────────────────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--border); padding: 24px 20px; text-align: center; font-size: .8rem; color: var(--muted); }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}

/* Keyboard focus ring — site-wide a11y pass 2026-09-04; :where() keeps 0 specificity so any existing focus style still wins. */
:where(a,button,summary,input,textarea,select,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:2px;}

/* print-friendly-standardized v1 */
@media print {
  .site-header, .site-nav, .nav-mobile-menu, .nav-hamburger,
  .calc-rail, .related-tool, .related-cluster, .related-tools,
  .page-footer, .site-footer, .action-row, .tool-actions,
  .seg-tabs, .st-modes, .mode-toggle, .mode-row, .chart-tip { display: none !important; }
  .calc-layout { display: block !important; }
  .calc-content { margin: 0 !important; padding: 0 !important; }
  body { background: #fff !important; color: #000 !important; }
  .card { box-shadow: none !important; background: #fff !important; border-color: #999 !important; }
  a[href]:after { content: "" !important; }
  @page { margin: 1.5cm; }
}