/* ==========================================================================
   London Gulf Nexus — site stylesheet
   Built on the exported Claude Design system (assets/ds/*). This file holds:
   the base reset, the design-system Button (verbatim from _ds_bundle.js),
   keyframes + responsive rules from the prototype, header/footer behaviour,
   and the hover styles the prototype expressed via `style-hover`.
   Tokens (navy/gold/ivory, Montserrat/Open Sans) come from assets/ds/styles.css.
   ========================================================================== */

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text-body);
  background: var(--surface-page);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
:focus-visible { outline: none; box-shadow: var(--ring-focus); border-radius: var(--radius-sm); }

.lgn-skip {
  position: absolute; left: 16px; top: -120px; z-index: 200;
  background: var(--navy-700); color: #fff; padding: 12px 18px;
  border-radius: var(--radius-sm); font-family: var(--font-display); font-weight: 600;
  transition: top var(--duration-normal) var(--ease-standard);
}
.lgn-skip:focus { top: 16px; }

/* ==========================================================================
   Design-system Button  (verbatim from _ds_bundle.js → components/buttons/Button)
   ========================================================================== */
.lgn-btn {
  --_bg: var(--navy-600); --_fg: #fff; --_bd: transparent;
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.02em;
  display: inline-flex; align-items: center; justify-content: center; gap: 0.55em;
  border: var(--border-medium) solid var(--_bd);
  background: var(--_bg); color: var(--_fg);
  border-radius: var(--radius-sm);
  cursor: pointer; white-space: nowrap; text-decoration: none;
  transition: background var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard),
              transform var(--duration-fast) var(--ease-standard);
}
.lgn-btn:focus-visible { outline: none; box-shadow: var(--ring-focus); }
.lgn-btn:active { transform: translateY(1px); box-shadow: none; }
.lgn-btn[disabled] { opacity: 0.45; cursor: not-allowed; pointer-events: none; }
/* sizes */
.lgn-btn--sm { font-size: var(--text-xs); padding: 0.5em 1em; }
.lgn-btn--md { font-size: var(--text-sm); padding: 0.7em 1.4em; }
.lgn-btn--lg { font-size: var(--text-base); padding: 0.85em 1.9em; }
/* variants */
.lgn-btn--primary { --_bg: var(--navy-600); --_fg: #fff; }
.lgn-btn--primary:hover { --_bg: var(--navy-800); box-shadow: 0 8px 20px rgba(0,13,42,0.28), inset 0 0 0 1px var(--gold-bright); transform: translateY(-1px); }
.lgn-btn--accent { --_bg: var(--gold-bright); --_fg: var(--navy-900); }
.lgn-btn--accent:hover { --_bg: var(--gold-500); box-shadow: var(--shadow-gold); transform: translateY(-1px); }
.lgn-btn--secondary { --_bg: transparent; --_fg: var(--navy-700); --_bd: var(--navy-600); }
.lgn-btn--secondary:hover { --_bg: var(--navy-600); --_fg: #fff; box-shadow: var(--shadow-sm); }
.lgn-btn--ghost { --_bg: transparent; --_fg: var(--navy-700); --_bd: transparent; }
.lgn-btn--ghost:hover { --_bg: var(--navy-50); }
.lgn-btn--on-navy { --_bg: transparent; --_fg: #fff; --_bd: rgba(255,255,255,0.45); }
.lgn-btn--on-navy:hover { --_bg: rgba(255,255,255,0.1); --_bd: var(--gold-bright); }

/* ==========================================================================
   Keyframes (from the prototype helmet)
   ========================================================================== */
@keyframes lgnDraw { to { stroke-dashoffset: 0; } }
@keyframes lgnPulse { 0%,100% { transform: scale(1); opacity: .95; } 50% { transform: scale(1.14); opacity: .7; } }
@keyframes lgnRing { 0% { transform: scale(.7); opacity: .55; } 100% { transform: scale(1.9); opacity: 0; } }
@keyframes lgnFlow { to { stroke-dashoffset: -20; } }
@keyframes lgnNodePulse { 0%, 100% { box-shadow: 0 8px 28px rgba(0,8,27,0.5), 0 0 0 0 rgba(237,180,30,0); } 50% { box-shadow: 0 8px 28px rgba(0,8,27,0.5), 0 0 0 10px rgba(237,180,30,0.14); } }

/* ==========================================================================
   HEADER  (injected by layout.js)
   ========================================================================== */
.lgn-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--ivory) 88%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 1px 0 var(--border-subtle);
  transition: box-shadow var(--duration-normal) var(--ease-standard);
}
.lgn-header.is-scrolled { box-shadow: 0 1px 0 var(--border-subtle), 0 10px 30px rgba(0,13,42,0.07); }
.lgn-header__inner {
  max-width: var(--container-xl); margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 40px); height: 72px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  transition: height var(--duration-normal) var(--ease-standard);
}
.lgn-header.is-scrolled .lgn-header__inner { height: 58px; }
.lgn-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.lgn-brand img { width: 40px; height: 40px; object-fit: contain; transition: width var(--duration-normal) var(--ease-standard), height var(--duration-normal) var(--ease-standard); }
.lgn-header.is-scrolled .lgn-brand img { width: 32px; height: 32px; }
.lgn-brand span { font-family: var(--font-display); font-weight: 700; font-size: 15px; letter-spacing: 0.02em; color: var(--navy-700); line-height: 1.05; }
.lgn-nav { display: flex; align-items: center; gap: clamp(18px, 2.4vw, 34px); }
.lgn-nav-link {
  background: none; border: none; cursor: pointer;
  font-family: var(--font-display); font-weight: 600; font-size: 14px; letter-spacing: 0.01em;
  color: var(--navy-700); padding: 6px 0; position: relative; text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}
.lgn-nav-link:hover, .lgn-nav-link[aria-current="page"] { color: var(--gold-700); }
.lgn-burger {
  display: none; align-items: center; justify-content: center;
  width: 44px; height: 44px; background: none; border: 1px solid var(--border-default);
  border-radius: var(--radius-sm); cursor: pointer; color: var(--navy-700);
}
.lgn-burger > span { display: block; width: 18px; height: 12px; border-top: 2px solid currentColor; border-bottom: 2px solid currentColor; position: relative; }
.lgn-burger > span::after { content: ""; position: absolute; top: 4px; left: 0; width: 100%; height: 2px; background: currentColor; }
.lgn-mobilemenu { border-top: 1px solid var(--border-subtle); background: var(--ivory); padding: 12px clamp(20px, 4vw, 40px) 24px; }
.lgn-mobilemenu nav { display: flex; flex-direction: column; }
.lgn-mobilemenu .lgn-nav-link { text-align: start; border-bottom: 1px solid var(--border-subtle); font-size: 16px; padding: 16px 0; }

/* Responsive nav (media queries can't be inline) */
.lgn-mobilemenu { display: none; }
@media (max-width: 880px) {
  .lgn-nav, .lgn-header-cta { display: none !important; }
  .lgn-burger { display: inline-flex !important; }
  .lgn-mobilemenu.is-open { display: block; }
}

/* ==========================================================================
   Hover styles the prototype expressed via `style-hover`
   ========================================================================== */
.lgn-scroller { scrollbar-width: none; -ms-overflow-style: none; }
.lgn-scroller::-webkit-scrollbar { height: 0; width: 0; display: none; }

.lgn-pillar { transition: box-shadow .22s var(--ease-standard), transform .22s var(--ease-standard), border-color .22s var(--ease-standard); }
.lgn-pillar:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); border-color: var(--stone-300); }

.lgn-case { transition: box-shadow .22s var(--ease-standard), transform .22s var(--ease-standard); }
.lgn-case:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }

.lgn-ind { transition: box-shadow .2s var(--ease-standard), transform .2s var(--ease-standard), border-color .2s var(--ease-standard); }
.lgn-ind:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: var(--stone-300); }

.lgn-caro-btn { transition: border-color .2s var(--ease-standard), background .2s var(--ease-standard); }
.lgn-caro-btn:hover { border-color: var(--navy-600); background: var(--navy-50); }

.lgn-foot-link { transition: color var(--duration-fast) var(--ease-standard); }
.lgn-foot-link:hover { color: var(--gold-bright); }

.lgn-social { transition: border-color var(--duration-fast) var(--ease-standard), color var(--duration-fast) var(--ease-standard); }
.lgn-social:hover { border-color: var(--gold-bright); color: var(--gold-bright); }

.lgn-stage { transition: background .2s var(--ease-standard), border-color .2s var(--ease-standard); }

/* ==========================================================================
   Reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .lgnx-anim { animation: none !important; }
  [data-reveal], [data-hero-el], [data-slide] { opacity: 1 !important; transform: none !important; }
}