/* ============================================================================
   IMPERIUM — BASE
   Reset, document defaults, typography primitives, layout helpers, a11y.
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--imp-black);
  color: var(--imp-ivory);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  overflow-x: hidden;
  font-feature-settings: "liga" 1, "kern" 1;
}

/* Ambient ground: faint vignette + a single warm light source, top-centre. */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(184,146,90,0.10), transparent 55%),
    radial-gradient(90% 60% at 50% 110%, rgba(0,0,0,0.6), transparent 60%);
}
main, header, footer { position: relative; z-index: 1; }

img, svg, video, canvas { display: block; max-width: 100%; }
img, video { height: auto; }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
input, select, textarea, button { font-family: inherit; }
ul, ol { list-style: none; padding: 0; }

/* --- Type primitives ------------------------------------------------------ */
h1, h2, h3, h4 { font-weight: 400; line-height: var(--lh-snug); }

.display, .h1 { font-family: var(--font-display); line-height: var(--lh-tight); }
.display { font-size: var(--fs-display); font-weight: 600; letter-spacing: var(--ls-tight); }
.h1 { font-size: var(--fs-h1); font-weight: 600; }
.h2 { font-family: var(--font-serif); font-size: var(--fs-h2); font-weight: 500; }
.h3 { font-family: var(--font-serif); font-size: var(--fs-h3); font-weight: 500; }

.serif { font-family: var(--font-serif); }
.lead  { font-size: var(--fs-lead); color: var(--imp-ivory-dim); line-height: 1.5; }
.small { font-size: var(--fs-sm); }
.dim   { color: var(--imp-ivory-dim); }
.muted { color: var(--imp-muted); }

.eyebrow {
  font-size: var(--fs-xs); letter-spacing: var(--ls-eyebrow); text-transform: uppercase;
  color: var(--imp-gold); font-weight: 500; display: inline-flex; align-items: center; gap: var(--s-3);
}
.eyebrow::before {
  content: ""; width: 2.2rem; height: 1px;
  background: linear-gradient(90deg, transparent, var(--imp-gold));
}
.eyebrow.center::after {
  content: ""; width: 2.2rem; height: 1px;
  background: linear-gradient(90deg, var(--imp-gold), transparent);
}

/* Metallic text — applied to short display fragments only (readability). */
.metal-text {
  background: var(--imp-metal);
  -webkit-background-clip: text; background-clip: text;
  color: transparent; -webkit-text-fill-color: transparent;
}
/* Fallback if background-clip:text unsupported */
@supports not ((-webkit-background-clip: text) or (background-clip: text)) {
  .metal-text { color: var(--imp-champagne); }
}

.gold { color: var(--imp-gold-bright); }

/* --- Layout --------------------------------------------------------------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.container-narrow { max-width: var(--container-narrow); }

.section { padding-block: clamp(4rem, 8vw, 9rem); position: relative; }
.section-sm { padding-block: clamp(3rem, 5vw, 5rem); }

.section-head { max-width: 46rem; margin-bottom: var(--s-7); }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head .h2 { margin-top: var(--s-4); }
.section-head p { margin-top: var(--s-4); }

.rule { height: 1px; border: 0; background: linear-gradient(90deg, transparent, var(--imp-line), transparent); }
.rule-gold { height: 1px; border: 0; background: linear-gradient(90deg, transparent, color-mix(in srgb,var(--imp-gold) 60%, transparent), transparent); }

.grid { display: grid; gap: var(--s-6); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .cols-3, .cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; } }

.stack > * + * { margin-top: var(--s-4); }
.flow > * + * { margin-top: var(--s-5); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--s-4); align-items: center; }
.between { display: flex; justify-content: space-between; align-items: center; gap: var(--s-4); }

/* --- Accessibility -------------------------------------------------------- */
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; top: -100%; left: var(--s-4); z-index: var(--z-toast);
  background: var(--imp-gold); color: var(--imp-on-gold); padding: var(--s-3) var(--s-5);
  border-radius: var(--r-md); font-weight: 600; letter-spacing: var(--ls-nav);
  text-transform: uppercase; font-size: var(--fs-xs);
}
.skip-link:focus { top: var(--s-4); }

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--imp-gold-bright);
  outline-offset: 3px; border-radius: var(--r-sm);
}
::selection { background: color-mix(in srgb, var(--imp-gold) 40%, transparent); color: var(--imp-ivory); }

/* Reveal animation base — JS adds .in when element enters viewport. */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity var(--t-slow) var(--e-out), transform var(--t-slow) var(--e-out); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 90ms; }
.reveal[data-delay="2"] { transition-delay: 180ms; }
.reveal[data-delay="3"] { transition-delay: 270ms; }
.reveal[data-delay="4"] { transition-delay: 360ms; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* Utility */
.text-center { text-align: center; }
.mt-0{margin-top:0}.mt-4{margin-top:var(--s-4)}.mt-5{margin-top:var(--s-5)}.mt-6{margin-top:var(--s-6)}.mt-7{margin-top:var(--s-7)}
.mb-0{margin-bottom:0}.mb-4{margin-bottom:var(--s-4)}.mb-6{margin-bottom:var(--s-6)}
.hide { display: none !important; }
@media (max-width: 760px) { .hide-mobile { display: none !important; } }
@media (min-width: 761px) { .only-mobile { display: none !important; } }