/* ── Fonts (self-hosted) ── */
@font-face {
  font-family: 'Glacial Indifference';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('fonts/GlacialIndifference-Regular.woff') format('woff');
}
@font-face {
  font-family: 'Glacial Indifference';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('fonts/GlacialIndifference-Bold.woff') format('woff');
}

/* ── Cross-page view transitions (progressive enhancement) ── */
@view-transition {
  navigation: auto;
}

/* ── Reset & Base ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --gold: #C9A96E;
  --gold-light: rgba(201, 169, 110, 0.15);
  --black: #111;
  --white: #fff;
  --grey: #888;
  --light-grey: #f5f5f5;
  --heading: 'Glacial Indifference', Helvetica, Arial, sans-serif;
  --body: 'Glacial Indifference', Helvetica, Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--body);
  font-weight: 300;
  color: var(--black);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--gold);
  color: var(--white);
}

img { display: block; max-width: 100%; }

a {
  color: inherit;
  text-decoration: none;
}

/* ── Fade-in animation ── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
  transition-delay: var(--delay, 0ms);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Section label ── */
.section-label {
  font-family: var(--body);
  font-weight: 400;
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--grey);
  margin-bottom: 10px;
  display: block;
}

#contact .section-label {
  color: rgba(255,255,255,0.45);
}

/* ═══════════════════════════════════
   STICKY NAV
═══════════════════════════════════ */
.sticky-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 8%;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transform: translateY(-100%);
  transition: transform 0.4s ease;
}

.sticky-nav.visible {
  transform: translateY(0);
}

.sticky-nav-brand {
  font-family: var(--heading);
  font-weight: 400;
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.sticky-nav-back {
  font-family: var(--body);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grey);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color 0.3s;
}
.sticky-nav-back:hover { color: var(--black); }
.sticky-nav-back svg { width: 14px; height: 14px; }

/* ═══════════════════════════════════
   BACK TO TOP
═══════════════════════════════════ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 800;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--black);
  color: var(--white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.3s, transform 0.3s, background 0.3s;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--gold);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}

/* ═══════════════════════════════════
   PROJECT PAGE SHARED STRUCTURE
═══════════════════════════════════ */
.page-section {
  width: 100%;
  padding: 100px 8%;
  scroll-margin-top: 56px;
}

#project-hero {
  padding-top: 120px;
  padding-bottom: 100px;
}

.breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--body);
  font-weight: 400;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--grey);
  margin-bottom: 40px;
  transition: color 0.3s;
}
.breadcrumb:hover { color: var(--gold); }
.breadcrumb svg { width: 14px; height: 14px; }

.project-title {
  font-family: var(--heading);
  font-weight: 300;
  font-size: clamp(3rem, 7.5vw, 6rem);
  letter-spacing: 0.04em;
  line-height: 1;
  text-transform: uppercase;
  margin-bottom: 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.hero-copy p {
  font-family: var(--body);
  font-weight: 300;
  font-size: 1.05rem;
  line-height: 1.8;
  color: #333;
  margin-bottom: 20px;
}
.hero-copy p:last-child { margin-bottom: 0; }

.hero-photos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.hero-photos img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.hero-photos .photo:hover img { transform: scale(1.03); }

/* ═══════════════════════════════════
   SPREAD SECTIONS
═══════════════════════════════════ */
.spread-section {
  padding: 80px 8%;
  background: var(--white);
}
.spread-section:nth-of-type(even) {
  background: var(--light-grey);
}

.spread-label {
  display: block;
  text-align: center;
  font-family: var(--body);
  font-weight: 400;
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--grey);
  margin-bottom: 24px;
}

.spread {
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  aspect-ratio: 16/9;
  background: var(--white);
  overflow: hidden;
  cursor: zoom-in;
  box-shadow: 0 20px 60px -20px rgba(0,0,0,0.15);
}
.spread img {
  width: 100%; height: 100%;
  object-fit: contain;
  background: var(--white);
}

/* ═══════════════════════════════════
   PHOTO PAIR SECTION
═══════════════════════════════════ */
.photo-pair-section {
  padding: 80px 8%;
}
.photo-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 1400px;
  margin: 0 auto;
}
.photo-pair .photo {
  aspect-ratio: 3/4;
  overflow: hidden;
  background: var(--light-grey);
  cursor: zoom-in;
}
.photo-pair img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.photo-pair .photo:hover img { transform: scale(1.02); }

/* ═══════════════════════════════════
   PROJECT FOOTER
═══════════════════════════════════ */
.project-footer {
  background: var(--black);
  color: var(--white);
  padding: 80px 8%;
  text-align: center;
}
.project-footer .section-label { color: rgba(255,255,255,0.45); }
.project-footer a {
  font-family: var(--heading);
  font-weight: 300;
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  transition: color 0.3s;
}
.project-footer a:hover { color: var(--gold); }
.project-footer a svg { width: 22px; height: 22px; }

/* ── Project prev/next navigation (Phase 9) ── */
.project-footer-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 40px;
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
}

.project-footer .project-nav-link {
  font-family: var(--heading);
  font-weight: 300;
  font-size: clamp(0.8rem, 1.5vw, 1rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: color 0.3s;
}
.project-footer .project-nav-link:hover {
  color: var(--gold);
}
.project-nav-link .nav-direction {
  font-size: 0.65rem;
  letter-spacing: 0.28em;
  color: rgba(255,255,255,0.3);
  transition: color 0.3s;
}
.project-footer .project-nav-link:hover .nav-direction {
  color: var(--gold);
}
.project-nav-link--next {
  text-align: right;
}
.project-footer-back {
  text-align: center;
}

/* ═══════════════════════════════════
   LIGHTBOX
═══════════════════════════════════ */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.95);
  z-index: 1100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  cursor: zoom-out;
}
.lightbox.active { opacity: 1; pointer-events: all; }
.lightbox img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
.lightbox-close {
  position: absolute;
  top: 24px; right: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: var(--white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s;
}
.lightbox-close:hover { background: rgba(255,255,255,0.2); }
.lightbox-close svg { width: 22px; height: 22px; }

/* ═══════════════════════════════════
   RESPONSIVE — shared
═══════════════════════════════════ */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 600px) {
  .page-section { padding: 60px 5%; }
  .spread-section,
  .photo-pair-section,
  .photo-triple-section { padding: 50px 5%; }
  #project-hero { padding-top: 90px; padding-bottom: 60px; }
  .project-title { font-size: clamp(2.2rem, 10vw, 3.5rem); letter-spacing: 0.02em; }
  .breadcrumb { margin-bottom: 28px; font-size: 0.7rem; }
  .hero-copy p { font-size: 0.95rem; }
  .hero-photos { gap: 10px; }
  .photo-pair { gap: 12px; }
  .spread { box-shadow: 0 10px 30px -10px rgba(0,0,0,0.15); }
  .back-to-top { bottom: 20px; right: 20px; width: 38px; height: 38px; }
  .lightbox { padding: 20px; }
  .lightbox-close { top: 14px; right: 14px; width: 38px; height: 38px; }
  .sticky-nav {
    transform: translateY(0);
    transition: none;
    padding: 12px 4%;
  }
  .sticky-nav-brand { letter-spacing: 0.1em; }
  .project-footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .project-nav-link--next { text-align: center; }
  .project-footer-back { order: -1; }
}

/* ═══════════════════════════════════
   REDUCED MOTION (Phase 7)
═══════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .reveal.visible {
    opacity: 1;
    transform: none;
  }
  @view-transition {
    navigation: none;
  }
}