/* ───────────────────────────────────────────────────────────────
   Zorya Murphy, SRES® — shared styles
   Tokens, reset, chrome (nav, footer, buttons, eyebrow), focus.
   Page-specific styles remain inline in each HTML file.
   See DESIGN.md for the design system.
   ─────────────────────────────────────────────────────────────── */

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

:root {
  /* Navy ramp (tonal depth) */
  --navy: #111B27;        /* Threshold Navy: body bg */
  --navy2: #1C2E42;       /* Mid Navy: secondary surface */
  --deep-navy: #0D1720;   /* Deep Navy: portrait & gallery compartments */
  --ink-navy: #080E16;    /* Ink Navy: footer */

  /* Hot accent */
  --gold: #C9A96E;        /* Heirloom Gold */
  --gold2: #E8D5A3;       /* Lamplight Gold (hover) */

  /* SRES designation surface */
  --blue: #1A6FB5;        /* Marker Blue */
  --sky: #8ACFFF;         /* Sky Blue (text on Marker Blue) */

  /* Light surface */
  --white: #FAFAF7;       /* Linen White */
  --warm-paper: #F5F0E8;  /* Warm Paper (pillar hover) */
  --slate-ink: #5A6A7A;   /* Slate Ink (body on light) */

  /* Muted text on navy — clears WCAG AA at 4.5:1 */
  --text-muted: rgba(255,255,255,0.72);
  --text-quiet: rgba(255,255,255,0.55);

  /* Hairlines */
  --hairline: rgba(255,255,255,0.08);
  --hairline-strong: rgba(255,255,255,0.15);

  /* Z-index scale */
  --z-nav: 100;
  --z-skip: 200;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--navy);
  color: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Skip link ── */
.skip-link {
  position: absolute;
  top: 0; left: 0;
  z-index: var(--z-skip);
  background: var(--gold);
  color: var(--navy);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.875rem 1.5rem;
  transform: translateY(-110%);
  transition: transform 0.2s cubic-bezier(0.25, 1, 0.5, 1);
}

.skip-link:focus { transform: translateY(0); }

/* ── Focus ring system ── */
:focus { outline: none; }

:focus-visible {
  outline: 2px solid var(--gold2);
  outline-offset: 3px;
  border-radius: 1px;
}

/* On the light pillars surface, focus ring uses navy */
.on-light :focus-visible { outline-color: var(--navy); }

/* ── Nav ── */
/*
 * --nav-progress is set by JS (0 at scrollY ≤ 60px, 1 at scrollY ≥ 120px,
 * linear in between). Every nav property that fades is computed from it,
 * so the fill tracks the scroll position directly — no transition, no lag.
 */
nav {
  --nav-progress: 0;
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  padding-left: 2rem;
  padding-right: 2rem;
  padding-top: calc(1.1rem - 0.3rem * var(--nav-progress));
  padding-bottom: calc(1.1rem - 0.3rem * var(--nav-progress));
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(17, 27, 39, calc(0.62 * var(--nav-progress)));
  backdrop-filter:
    blur(calc(16px * var(--nav-progress)))
    saturate(calc(100% + 60% * var(--nav-progress)));
  -webkit-backdrop-filter:
    blur(calc(16px * var(--nav-progress)))
    saturate(calc(100% + 60% * var(--nav-progress)));
  border-bottom: 1px solid rgba(255, 255, 255, calc(0.06 * var(--nav-progress)));
}

.nav-logo {
  font-family: 'Libre Baskerville', Georgia, serif;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--white);
  letter-spacing: 0.08em;
  text-decoration: none;
  text-shadow: 0 1px 12px rgba(0, 0, 0, calc(0.6 * (1 - var(--nav-progress))));
  /* Tap area */
  padding: 0.6rem 0.25rem;
  margin: -0.6rem -0.25rem;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.92);
  text-decoration: none;
  text-shadow: 0 1px 10px rgba(0, 0, 0, calc(0.55 * (1 - var(--nav-progress))));
  transition: color 0.25s;
  /* 44px tap area without changing visual */
  padding: 0.9rem 0.1rem;
  margin: -0.9rem -0.1rem;
}

.nav-link.active { color: var(--gold); }
.nav-link:hover { color: var(--gold); }

.nav-cta {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  text-decoration: none;
  border: 1px solid rgba(201, 169, 110, calc(0.55 - 0.15 * var(--nav-progress)));
  padding: 0.55rem 1.25rem;
  border-radius: 1px;
  text-shadow: 0 1px 10px rgba(0, 0, 0, calc(0.5 * (1 - var(--nav-progress))));
  transition: background 0.25s, color 0.25s;
}

.nav-cta:hover {
  background: var(--gold);
  color: var(--navy);
  border-color: var(--gold);
}

/* ── Eyebrow ── */
.eyebrow {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-quiet);
  margin-bottom: 1.25rem;
}

/* ── Primary button (gold) ── */
.btn-gold {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--gold);
  color: var(--navy);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.875rem 2.5rem;
  border-radius: 1px;
  transition: background 0.25s;
}

.btn-gold:hover { background: var(--gold2); }

/* ── Footer ── */
footer {
  background: var(--ink-navy);
  padding: 2rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-left {
  font-family: 'Libre Baskerville', Georgia, serif;
  font-size: 1rem;
  color: rgba(255,255,255,0.7);
  font-weight: 300;
  letter-spacing: 0.04em;
}

.footer-left > span {
  display: block;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-quiet);
  margin-top: 0.25rem;
}

.footer-logos {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.footer-right {
  font-size: 0.7rem;
  color: var(--text-quiet);
}

@media (max-width: 700px) {
  nav { padding: 1rem 1.25rem; }
  .nav-right { gap: 1rem; }
  .nav-cta { padding: 0.45rem 0.9rem; }

  footer {
    padding: 2rem;
    flex-direction: column;
    text-align: center;
  }
  .footer-right { text-align: center; }
}