/* ==========================================================================
   SirusAI — site-wide styles (shared across all pages)
   Imports brand tokens from colors_and_type.css
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

/* ---------- Layout primitives ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--space-5); }
.container--narrow { max-width: var(--container-narrow); }
.container--wide   { max-width: var(--container-wide); }
section { padding: clamp(var(--space-8), 4vw + 2rem, var(--space-10)) 0; }

.rule { border: 0; height: 1px; background: var(--line); margin: 0; }

/* ---------- TOP NAV ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-med) var(--ease-standard), background var(--dur-med) var(--ease-standard);
}
.nav.is-scrolled { border-bottom-color: var(--line); }
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; gap: var(--space-5);
}
.nav__brand {
  display: flex; align-items: center; gap: var(--space-3);
  font-weight: 700; letter-spacing: -0.01em; font-size: 1.0625rem;
  color: var(--fg);
}
.nav__brand:hover .nav__mark { transform: rotate(-8deg); }
.nav__mark {
  width: 28px; height: 28px; flex: 0 0 auto;
  transition: transform var(--dur-med) var(--ease-emphasized);
}

.nav__links {
  display: flex; gap: var(--space-5); align-items: center;
  font-size: 0.9375rem;
}
.nav__links a {
  color: var(--fg-2);
  position: relative; padding: 6px 0;
  transition: color var(--dur-med) var(--ease-standard);
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 1px; background: var(--sirus-gold);
  transition: right var(--dur-med) var(--ease-standard);
}
.nav__links a:hover, .nav__links a.is-active { color: var(--fg); }
.nav__links a:hover::after, .nav__links a.is-active::after { right: 0; }

.nav__cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius-md);
  background: var(--sirus-ink); color: var(--fg-on-ink);
  font-weight: 500; font-size: 0.9375rem;
  transition: background var(--dur-med) var(--ease-standard);
}
.nav__cta:hover { background: #1a253d; }
.nav__cta svg { width: 14px; height: 14px; }

.nav__burger { display: none; width: 32px; height: 32px; align-items: center; justify-content: center; }
.nav__burger svg { width: 22px; height: 22px; }

@media (max-width: 880px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__burger { display: inline-flex; }
}

/* Mobile drawer */
.drawer {
  position: fixed; inset: 0; z-index: 60;
  background: var(--bg);
  transform: translateY(-100%);
  transition: transform var(--dur-med) var(--ease-standard);
  padding: var(--space-5);
  overflow-y: auto;
}
.drawer.is-open { transform: translateY(0); }
.drawer__head { display: flex; justify-content: space-between; align-items: center; height: 72px; }
.drawer__links { display: flex; flex-direction: column; gap: var(--space-3); margin-top: var(--space-5); }
.drawer__links a {
  display: block; padding: var(--space-3) 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 1.875rem; line-height: 1;
  letter-spacing: -0.01em;
}
.drawer__links a em { font-style: italic; color: var(--sirus-gold); }

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 22px;
  border-radius: var(--radius-md);
  font: 500 0.9375rem/1 var(--font-sans);
  transition: transform var(--dur-fast) var(--ease-exit),
              background var(--dur-med) var(--ease-standard),
              border-color var(--dur-med) var(--ease-standard),
              color var(--dur-med) var(--ease-standard);
  border: 1px solid transparent;
  cursor: pointer;
}
.btn svg { width: 14px; height: 14px; transition: transform var(--dur-med) var(--ease-standard); }
.btn:hover svg { transform: translateX(3px); }
.btn:active { transform: scale(0.98); }
.btn--ink { background: var(--sirus-ink); color: var(--fg-on-ink); }
.btn--ink:hover { background: #1a253d; }
.btn--ghost { background: transparent; color: var(--fg); border-color: var(--line-strong); }
.btn--ghost:hover { border-color: var(--sirus-ink); background: var(--sirus-paper-2); }
.btn--gold { background: var(--sirus-gold); color: var(--sirus-ink); border-color: var(--sirus-gold); }
.btn--gold:hover { background: #d2ad58; border-color: #d2ad58; }
.btn--ghost-ink { background: transparent; color: var(--fg-on-ink); border-color: var(--sirus-ink-3); }
.btn--ghost-ink:hover { border-color: var(--fg-on-ink-2); }

/* ---------- EYEBROW / SECTION HEAD ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-3);
  font: 600 var(--fs-eyebrow)/1 var(--font-sans);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--fg-3);
}
.eyebrow::before {
  content: ""; display: block; width: 24px; height: 1px;
  background: currentColor; opacity: 0.5;
}
[data-theme="ink"] .eyebrow { color: var(--fg-on-ink-2); }

.sec-head { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-7); align-items: end; }
@media (max-width: 760px) { .sec-head { grid-template-columns: 1fr; gap: var(--space-5); } }
.sec-head__title {
  font-family: var(--font-display);
  font-size: var(--fs-display-3);
  line-height: 1.05; letter-spacing: -0.02em;
  max-width: 18ch;
  color: var(--fg);
}
.sec-head__title em { font-style: italic; }
.sec-head__title .num {
  display: inline-block;
  font-family: var(--font-display); font-style: italic;
  font-size: 0.55em; color: var(--sirus-gold);
  vertical-align: top; margin-right: 0.5em;
}
.sec-head__sub { color: var(--fg-2); max-width: 52ch; font-size: 1.0625rem; }
[data-theme="ink"] .sec-head__sub { color: #C9CFDB; }

/* ---------- DRIFTING SHARDS BG ---------- */
.shards {
  position: absolute; inset: 0;
  pointer-events: none; overflow: hidden;
  z-index: 0;
}
.shards .shard {
  position: absolute;
  background: var(--sirus-ink);
  opacity: 0.04;
  transform-origin: center;
  animation: drift var(--d, 24s) var(--ease-emphasized) infinite alternate;
}
[data-theme="ink"] .shards .shard { background: var(--sirus-paper); opacity: 0.05; }
@keyframes drift {
  from { transform: translate3d(0,0,0) rotate(var(--r,0deg)); }
  to   { transform: translate3d(var(--dx,30px), var(--dy,-20px), 0) rotate(calc(var(--r,0deg) + 8deg)); }
}

/* ---------- MARQUEE ---------- */
.marquee {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: var(--space-5) 0;
  background: var(--bg);
  overflow: hidden;
}
.marquee__inner {
  display: flex; align-items: center; gap: var(--space-7);
  white-space: nowrap;
  animation: scroll 50s linear infinite;
  width: max-content;
}
.marquee:hover .marquee__inner { animation-play-state: paused; }
.marquee__item {
  display: inline-flex; align-items: center; gap: var(--space-3);
  color: var(--fg-3);
  font: 500 0.875rem/1 var(--font-sans);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.marquee__item .glyph {
  display: inline-block; width: 6px; height: 6px;
  background: var(--sirus-gold);
  transform: rotate(45deg);
}
@keyframes scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ---------- FOOTER ---------- */
.footer {
  background: var(--sirus-ink); color: var(--fg-on-ink);
  padding: var(--space-9) 0 var(--space-6);
  position: relative; overflow: hidden;
}
.footer__halo {
  position: absolute; right: -20%; top: -50%;
  width: 60%; aspect-ratio: 1;
  background: radial-gradient(circle at center, rgba(201,162,75,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.footer .container { position: relative; }
.footer__top {
  display: grid; grid-template-columns: 1.4fr 1fr;
  gap: var(--space-7); align-items: end;
  padding-bottom: var(--space-7);
  border-bottom: 1px solid var(--sirus-ink-3);
}
@media (max-width: 880px) { .footer__top { grid-template-columns: 1fr; } }
.footer__cta-title {
  font-family: var(--font-display);
  font-size: var(--fs-display-3);
  line-height: 1.05; letter-spacing: -0.02em;
  color: var(--fg-on-ink);
  max-width: 16ch;
}
.footer__cta-title em { font-style: italic; }
.footer__cta-actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }

.footer__grid {
  margin-top: var(--space-7);
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: var(--space-6);
}
@media (max-width: 760px) { .footer__grid { grid-template-columns: 1fr 1fr; } }
.footer__brand {
  display: flex; align-items: center; gap: var(--space-3);
  font-weight: 700; font-size: 1.0625rem; color: var(--fg-on-ink);
}
.footer__brand .nav__mark { filter: invert(1) brightness(1.5); }
.footer__tag {
  margin-top: var(--space-4);
  font-family: var(--font-display); font-style: italic;
  font-size: 1.25rem; line-height: 1.35; color: var(--fg-on-ink-2);
  max-width: 28ch;
}
.footer__col h4 {
  margin: 0 0 var(--space-4);
  font: 600 var(--fs-eyebrow)/1 var(--font-sans);
  text-transform: uppercase; letter-spacing: var(--tracking-eyebrow);
  color: var(--fg-3);
}
.footer__col ul { list-style: none; margin: 0; padding: 0; }
.footer__col li { margin-bottom: var(--space-3); }
.footer__col a {
  font-size: 0.9375rem; color: var(--fg-on-ink-2);
  transition: color var(--dur-med) var(--ease-standard);
}
.footer__col a:hover { color: var(--fg-on-ink); }
.footer__bottom {
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--sirus-ink-3);
  display: flex; justify-content: space-between; align-items: center;
  font: 400 0.8125rem/1 var(--font-mono);
  color: var(--fg-3);
  flex-wrap: wrap; gap: var(--space-4);
}
.footer__bottom a { color: var(--fg-3); }
.footer__bottom a:hover { color: var(--fg-on-ink-2); }

/* ---------- REVEAL ---------- */
.reveal {
  opacity: 0; transform: translateY(16px);
  transition: opacity 520ms var(--ease-emphasized),
              transform 520ms var(--ease-emphasized);
}
.reveal.is-in { opacity: 1; transform: translateY(0); }

.reveal-stagger > * { opacity: 0; transform: translateY(14px); }
.reveal-stagger.is-in > * {
  opacity: 1; transform: translateY(0);
  transition: opacity 520ms var(--ease-emphasized),
              transform 520ms var(--ease-emphasized);
}
.reveal-stagger.is-in > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.is-in > *:nth-child(2) { transition-delay: 80ms; }
.reveal-stagger.is-in > *:nth-child(3) { transition-delay: 160ms; }
.reveal-stagger.is-in > *:nth-child(4) { transition-delay: 240ms; }
.reveal-stagger.is-in > *:nth-child(5) { transition-delay: 320ms; }
.reveal-stagger.is-in > *:nth-child(6) { transition-delay: 400ms; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- PAGE HERO (sub pages) ---------- */
.page-hero {
  position: relative;
  padding-top: clamp(var(--space-7), 5vw, var(--space-9));
  padding-bottom: clamp(var(--space-7), 5vw, var(--space-9));
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.page-hero__inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.2fr 1fr; gap: var(--space-7); align-items: end; }
@media (max-width: 880px) { .page-hero__inner { grid-template-columns: 1fr; } }
.page-hero__title {
  font-family: var(--font-display);
  font-size: var(--fs-display-2);
  line-height: 0.98; letter-spacing: -0.025em;
  max-width: 16ch;
}
.page-hero__title em { font-style: italic; }
.page-hero__lede {
  font-size: 1.125rem; line-height: 1.55; color: var(--fg-2);
  max-width: 50ch;
}
.page-hero__halo {
  position: absolute; inset: -10% -10% auto -10%; height: 80%;
  background: radial-gradient(60% 60% at 50% 30%, var(--sirus-paper-2) 0%, transparent 70%);
  pointer-events: none; z-index: 0;
}
.page-hero__crumbs {
  font: 500 var(--fs-xs)/1 var(--font-mono);
  color: var(--fg-3); letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-5);
}
.page-hero__crumbs a { color: var(--fg-3); }
.page-hero__crumbs a:hover { color: var(--fg); }
.page-hero__crumbs .sep { margin: 0 8px; color: var(--sirus-gold); }