/* IGC AI Playbook - site CSS.
   Extends the IGC design system tokens (Silka, palette, scale).
   ============================================================ */
@import url("igc-tokens.css");

/* ---------- Tweak overrides (keys: typeface, density) ---------- */
[data-typeface="public-sans"] { --font-brand: "Public Sans", Arial, sans-serif; }
[data-typeface="manrope"]     { --font-brand: "Manrope", Arial, sans-serif; }

[data-density="compact"] {
  --space-5: 18px; --space-6: 24px; --space-7: 36px; --space-8: 48px; --space-9: 72px;
}
[data-density="comfortable"] {
  --space-5: 28px; --space-6: 40px; --space-7: 56px; --space-8: 80px; --space-9: 112px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { background: #fff; }

/* ---------- Container ---------- */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-pad); }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 0 var(--container-pad); }

/* ---------- Sections ---------- */
.section { padding: var(--space-9) 0; }
.section--tight { padding: var(--space-7) 0; }
.section--cream { background: var(--igc-grey-050); }
.section--purple { background: var(--igc-purple); color: #fff; }
.section--purple h1, .section--purple h2, .section--purple h3, .section--purple h4 { color: #fff; }
.section--ink { background: var(--igc-purple-900); color: #fff; }
.section--ink h1, .section--ink h2, .section--ink h3 { color: #fff; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--igc-grey-300);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--igc-purple); font-weight: 700; font-size: 16px; letter-spacing: -0.005em; }
.brand .brand-mark { color: var(--igc-purple); font-weight: 800; }
.brand .brand-name { color: inherit; font-weight: 700; }
.brand .brand-name .sub { font-weight: 400; color: var(--igc-grey-700); margin-left: 4px; }
.brand img { height: 32px; width: auto; display: block; }
.brand-divider { width: 1px; height: 22px; background: var(--igc-grey-300); }
.brand-tag {
  display: inline-flex; flex-direction: column; gap: 0;
  font-family: var(--font-brand); color: var(--igc-charcoal);
}
.brand-tag .top { font-size: 14px; font-weight: 700; color: var(--igc-purple); letter-spacing: -0.01em; line-height: 1.1; }
.brand-tag .sub { font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--igc-grey-700); font-weight: 700; }

.nav-links { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; }
.nav-link {
  font-size: 14px; font-weight: 700;
  padding: 8px 12px; border-radius: 4px;
  color: var(--igc-charcoal); text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard), background var(--duration-fast);
}
.nav-link:hover { color: var(--igc-purple); background: var(--igc-purple-050); }
.nav-link.is-active { color: var(--igc-purple); background: var(--igc-purple-050); }

.nav-actions { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }

.print-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 12px;
  font-family: var(--font-brand); font-size: 13px; font-weight: 700;
  color: var(--igc-grey-700);
  background: none; border: 1px solid var(--igc-grey-300); border-radius: 4px;
  cursor: pointer; white-space: nowrap;
  transition: color var(--duration-fast), background var(--duration-fast), border-color var(--duration-fast);
  flex-shrink: 0;
}
.print-btn:hover { color: var(--igc-purple); border-color: var(--igc-purple); background: var(--igc-purple-050); }
.print-btn svg { flex-shrink: 0; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  background: none; border: 1px solid var(--igc-grey-300); border-radius: 4px;
  cursor: pointer; align-items: center; justify-content: center;
  color: var(--igc-charcoal);
}
.nav-toggle svg { width: 20px; height: 20px; }

@media (max-width: 920px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--igc-grey-300);
    flex-direction: column; align-items: stretch;
    padding: 8px 16px 16px; gap: 0; display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-link { padding: 12px 14px; }
  .print-btn span { display: none; }
  .print-btn { padding: 7px 8px; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 20px;
  font-family: var(--font-brand); font-weight: 700; font-size: 14px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  text-decoration: none; cursor: pointer; line-height: 1;
  transition: background var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard);
}
.btn:active { opacity: 0.85; }
.btn--primary { background: var(--igc-purple); color: #fff; }
.btn--primary:hover { background: var(--igc-purple-700); color: #fff; }
.btn--ghost { background: transparent; color: var(--igc-purple); border-color: var(--igc-purple); }
.btn--ghost:hover { background: var(--igc-purple); color: #fff; }
.btn--yellow { background: var(--igc-yellow); color: var(--igc-purple); }
.btn--yellow:hover { background: var(--igc-yellow-700); }
.btn--white { background: #fff; color: var(--igc-purple); }
.btn--white:hover { background: var(--igc-yellow); color: var(--igc-purple); }
.btn--lg { padding: 16px 24px; font-size: 15px; }
.btn--sm { padding: 8px 14px; font-size: 13px; }
.btn .arrow { transition: transform var(--duration-fast); }
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- Pills ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 700; letter-spacing: 0.04em;
  padding: 5px 10px; border-radius: var(--radius-pill);
  background: var(--igc-purple-050); color: var(--igc-purple);
  border: 1px solid var(--igc-purple-100);
}
.chip--teal { background: var(--igc-teal-100); color: var(--igc-teal-700); border-color: rgba(15,168,159,0.2); }
.chip--yellow { background: var(--igc-yellow-100); color: #7A5800; border-color: rgba(255,204,0,0.4); }
.chip--ink { background: var(--igc-charcoal); color: #fff; border-color: var(--igc-charcoal); }
.chip--outline { background: transparent; }

/* Eyebrow rule */
.rule-yellow {
  height: 4px; width: 56px; background: var(--igc-yellow);
  margin-bottom: var(--space-4);
}
.rule-purple { height: 4px; width: 56px; background: var(--igc-purple); margin-bottom: var(--space-4); }

/* ---------- Card ---------- */
.card {
  background: #fff;
  border: 1px solid var(--igc-grey-300);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  transition: box-shadow var(--duration-base) var(--ease-standard), border-color var(--duration-base);
}
.card--hover:hover { box-shadow: var(--shadow-md); border-color: var(--igc-purple-100); }
.card--cream { background: var(--igc-grey-050); border-color: var(--igc-grey-100); }
.card--purple { background: var(--igc-purple); color: #fff; border-color: var(--igc-purple); }
.card--purple h3 { color: #fff; }
.card--purple p { color: rgba(255,255,255,0.85); }

/* Step number badge - square, geometric */
.step-num {
  display: inline-grid; place-items: center;
  width: 44px; height: 44px;
  background: var(--igc-purple); color: #fff;
  font-weight: 700; font-size: 18px;
  border-radius: var(--radius-sm); flex-shrink: 0;
  font-family: var(--font-brand);
}
.step-num--lg { width: 64px; height: 64px; font-size: 26px; border-radius: var(--radius-sm); }
.step-num--xl { width: 96px; height: 96px; font-size: 44px; }
.step-num--yellow { background: var(--igc-yellow); color: var(--igc-purple); }
.step-num--teal { background: var(--igc-teal); color: var(--igc-purple); }
.step-num--outline { background: transparent; color: var(--igc-purple); border: 2px solid var(--igc-purple); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--igc-purple-900); color: #E8DDEE;
  padding: var(--space-7) 0 var(--space-5);
}
.site-footer a { color: #fff; }
.site-footer .footer-grid {
  display: grid; gap: var(--space-6);
  grid-template-columns: 2fr 1fr 1fr 1fr;
  padding-bottom: var(--space-6);
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.site-footer h5 { color: var(--igc-yellow); font-size: 12px; text-transform: uppercase; letter-spacing: 0.16em; margin: 0 0 14px; font-weight: 700; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; font-size: 14px; }
.site-footer li a { text-decoration: none; opacity: 0.85; }
.site-footer li a:hover { opacity: 1; color: var(--igc-yellow); }
.site-footer .partners {
  background: #fff; border-radius: var(--radius-sm); padding: 18px 24px;
  display: inline-block; margin-top: 14px;
}
.site-footer .partners img { height: 56px; display: block; }
.site-footer .fine {
  margin-top: var(--space-5);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 12px; color: rgba(255,255,255,0.6);
}
@media (max-width: 880px) {
  .site-footer .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- Tweaks panel ---------- */
.tweaks-fab {
  position: fixed; right: 20px; bottom: 20px; z-index: 60;
  display: none;
  width: 52px; height: 52px;
  background: var(--igc-purple); color: #fff;
  border: none; border-radius: var(--radius-pill); cursor: pointer;
  box-shadow: var(--shadow-lg);
  align-items: center; justify-content: center;
}
.tweaks-fab svg { width: 22px; height: 22px; }
.tweaks-panel {
  position: fixed; right: 20px; bottom: 84px; z-index: 60;
  width: 320px; max-width: calc(100vw - 40px);
  background: #fff; border: 1px solid var(--igc-grey-300);
  border-radius: var(--radius-md); box-shadow: var(--shadow-lg);
  padding: 20px;
  display: none;
}
.tweaks-panel.is-open { display: block; }
.tweaks-panel h4 { font-size: 11px; text-transform: uppercase; letter-spacing: 0.16em; margin: 0 0 8px; color: var(--igc-grey-700); font-weight: 700; }
.tweaks-panel .panel-title { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--igc-grey-300); }
.tweaks-panel .panel-title strong { font-size: 14px; color: var(--igc-purple); letter-spacing: 0.04em; text-transform: uppercase; }
.tweaks-panel .panel-close {
  background: none; border: none; cursor: pointer; font-size: 20px; line-height: 1;
  color: var(--igc-grey-700); padding: 0; width: 24px; height: 24px;
}
.tweaks-section { margin-bottom: 14px; }
.tweaks-section:last-child { margin-bottom: 0; }
.tweaks-segments {
  display: grid; grid-auto-flow: column; grid-auto-columns: 1fr;
  background: var(--igc-grey-100); border-radius: var(--radius-sm); padding: 3px;
  gap: 2px;
}
.tweaks-segments button {
  background: transparent; border: none; cursor: pointer;
  padding: 8px 6px; font-size: 12px; font-weight: 700; font-family: inherit;
  border-radius: 3px; color: var(--igc-charcoal); text-transform: capitalize;
}
.tweaks-segments button.is-active { background: #fff; color: var(--igc-purple); box-shadow: 0 1px 2px rgba(0,0,0,0.06); }

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .tweaks-fab, .tweaks-panel, .no-print { display: none !important; }
  body { background: #fff; color: #000; font-size: 12pt; margin: 0; }
  .section { padding: 16px 0; }
  a { color: #000; text-decoration: none; }
  .card { border: 1px solid #ccc; box-shadow: none !important; break-inside: avoid; }
  h1, h2, h3 { color: #000 !important; break-after: avoid; }
  img { max-width: 100%; }
  .container { max-width: 100%; padding: 0 16px; }
  @page { margin: 1.5cm 2cm; }
}

/* ---------- Utilities ---------- */
.row { display: flex; gap: var(--space-4); flex-wrap: wrap; align-items: center; }
.row--between { justify-content: space-between; }
.row--top { align-items: flex-start; }
.stack > * + * { margin-top: var(--space-4); }
.stack-lg > * + * { margin-top: var(--space-6); }
.muted { color: var(--igc-grey-700); }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0 !important; }
.mb-2 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mt-4 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.grid { display: grid; gap: var(--space-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 880px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Focus - teal per IGC system */
:focus-visible { outline: 2px solid var(--igc-teal); outline-offset: 2px; border-radius: var(--radius-xs); }

/* Shared headline emphasis: yellow underline on a key word */
.hl-yellow {
  background: linear-gradient(transparent 60%, var(--igc-yellow) 60%);
  padding: 0 2px;
}

/* Inline icon */
.icon { width: 1em; height: 1em; vertical-align: -0.15em; }

/* Page hero */
.page-hero {
  background: var(--igc-purple); color: #fff;
  padding: var(--space-8) 0 var(--space-7);
  position: relative;
}
.page-hero h1 { color: #fff; margin: 0 0 16px; max-width: 18ch; }
.page-hero .lead { color: rgba(255,255,255,0.85); max-width: 60ch; margin: 0; }
.page-hero .eyebrow { color: var(--igc-yellow); }
.page-hero .crumbs { color: rgba(255,255,255,0.7); font-size: 13px; margin-bottom: 24px; }
.page-hero .crumbs a { color: rgba(255,255,255,0.7); text-decoration: none; }
.page-hero .crumbs a:hover { color: #fff; }
.page-hero .crumbs .sep { margin: 0 8px; opacity: 0.4; }