/* ==========================================================
   Ground Floor Studio
   groundfloorstudio.joshuaborsman.com
   ========================================================== */

:root {
  --bg:        #0e0d0c;
  --bg-soft:   #161413;
  --bg-card:   #1d1b19;
  --line:      #2a2624;
  --text:      #efe9df;
  --text-dim:  #918a7e;
  --accent:    #d49350;     /* warm copper */
  --accent-dim:#8a6235;
  --neon:      #ff5b8a;
  --max:       1480px;
  --gap:       clamp(1rem, 2vw, 2rem);
  --pad-x:     clamp(1.25rem, 4vw, 3.5rem);
  --ease:      cubic-bezier(0.22, 0.61, 0.36, 1);
  --r:         3px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

button { font-family: inherit; cursor: pointer; }

/* ── Typography ─────────────────────────────────────────── */

.serif {
  font-family: "Cormorant Garamond", "Playfair Display", Georgia, serif;
  font-weight: 500;
  font-style: italic;
}

h1, h2, h3, h4 {
  font-family: "Cormorant Garamond", "Playfair Display", Georgia, serif;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.05;
}

h1 { font-size: clamp(3.5rem, 11vw, 11rem); }
h2 { font-size: clamp(2.5rem, 6vw, 5.5rem); }
h3 { font-size: clamp(1.75rem, 3.5vw, 2.75rem); }
h4 { font-size: clamp(1.15rem, 2vw, 1.5rem); font-family: "Inter", sans-serif; font-weight: 600; letter-spacing: 0.02em; }

p { font-size: clamp(1rem, 1.05vw, 1.0625rem); }

.eyebrow {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}

.lead {
  font-size: clamp(1.15rem, 1.5vw, 1.4rem);
  line-height: 1.55;
  color: var(--text);
  font-weight: 300;
}

.muted { color: var(--text-dim); }

/* ── Layout ─────────────────────────────────────────────── */

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.section {
  padding: clamp(5rem, 10vw, 9rem) 0;
}

.section + .section { padding-top: 0; }

.divider-rule {
  width: 36px;
  height: 1px;
  background: var(--accent);
  margin: 1.5rem 0;
}

/* ── Navigation ─────────────────────────────────────────── */

#nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 1.25rem var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.4s var(--ease), backdrop-filter 0.4s, padding 0.3s;
}

#nav.scrolled {
  background: rgba(14, 13, 12, 0.85);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.brand-mark {
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--accent);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.brand-mark::after {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

.nav-links {
  display: flex;
  gap: 2.25rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
  transition: color 0.2s;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -4px; left: 0;
  height: 1px; width: 0;
  background: var(--accent);
  transition: width 0.3s var(--ease);
}

.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  padding: 0.5rem;
  border-radius: var(--r);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  margin: 4px 0;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

/* ── Hero ─────────────────────────────────────────────── */

#hero {
  position: relative;
  height: 100svh;
  min-height: 620px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0 var(--pad-x) clamp(2.5rem, 6vw, 5rem);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  transform: scale(1.05);
  animation: heroZoom 12s var(--ease) forwards;
}

@keyframes heroZoom {
  to { transform: scale(1); }
}

.hero-bg::after {
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(14,13,12,0.45) 0%, rgba(14,13,12,0.0) 25%, rgba(14,13,12,0.6) 75%, rgba(14,13,12,0.95) 100%),
    radial-gradient(ellipse at 30% 90%, rgba(212,147,80,0.18) 0%, rgba(0,0,0,0) 60%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1100px;
}

.hero-tag {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.hero-tag::before {
  content: "";
  width: 30px;
  height: 1px;
  background: var(--accent);
}

.hero-title {
  font-family: "Cormorant Garamond", serif;
  font-style: italic;
  font-weight: 400;
  font-size: clamp(3.5rem, 12vw, 12rem);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--text);
}

.hero-title .accent { color: var(--accent); font-style: normal; font-weight: 500; }

.hero-meta {
  margin-top: 2rem;
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.hero-meta span strong {
  display: block;
  color: var(--text);
  font-weight: 500;
  font-size: 0.85rem;
  margin-top: 0.25rem;
  letter-spacing: 0.02em;
}

.hero-scroll {
  position: absolute;
  bottom: 1.5rem;
  right: var(--pad-x);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
  z-index: 2;
}

.hero-scroll svg {
  width: 20px;
  height: 20px;
  animation: scrollHint 2.5s ease-in-out infinite;
}

@keyframes scrollHint {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50%      { transform: translateY(8px); opacity: 1; }
}

/* ── Intro ─────────────────────────────────────────────── */

#intro {
  background: var(--bg);
  padding-top: clamp(6rem, 12vw, 11rem);
}

.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: start;
}

.intro-grid > div:first-child {
  position: sticky;
  top: 7rem;
}

.intro-text p {
  font-size: clamp(1.1rem, 1.4vw, 1.3rem);
  line-height: 1.65;
  color: var(--text);
  margin-bottom: 1.5rem;
  font-weight: 300;
}

.intro-text p:first-of-type {
  font-size: clamp(1.4rem, 2vw, 1.85rem);
  line-height: 1.45;
  color: var(--text);
  font-weight: 300;
  margin-bottom: 2rem;
}

/* ── Pull stats ──────────────────────────────────────── */

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: clamp(3rem, 6vw, 5rem);
}

.metric {
  background: var(--bg);
  padding: clamp(1.5rem, 3vw, 2.5rem) clamp(1rem, 2vw, 2rem);
}

.metric-num {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.metric-lbl {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  line-height: 1.4;
}

/* ── Chapter heading ───────────────────────────────────── */

.chapter-head {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.chapter-num {
  font-family: "Cormorant Garamond", serif;
  font-style: italic;
  font-size: clamp(3rem, 6vw, 5rem);
  color: var(--accent-dim);
  line-height: 1;
  flex-shrink: 0;
}

.chapter-title {
  flex: 1;
}

.chapter-title h2 { margin-bottom: 0.5rem; }

.chapter-title p {
  color: var(--text-dim);
  font-size: 0.95rem;
  max-width: 520px;
}

/* ── Image utilities ───────────────────────────────────── */

.figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--r);
  background: var(--bg-soft);
}

.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.9s var(--ease);
}

.figure:hover img { transform: scale(1.04); }

.figure-cap {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 1rem 1.25rem;
  background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.3s, transform 0.3s;
}

.figure:hover .figure-cap { opacity: 1; transform: translateY(0); }

/* ── Assembly grid (5-up responsive) ─────────────────── */

.assembly-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: clamp(0.5rem, 1vw, 1rem);
}

@media (max-width: 1100px) {
  .assembly-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 560px) {
  .assembly-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ── Before/After (Shell vs Build) ─────────────────────── */

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(0.5rem, 1vw, 1.25rem);
}

.compare-item {
  position: relative;
}

.compare-item .figure {
  aspect-ratio: 4/3;
}

.compare-label {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.compare-label::before {
  content: "—";
  margin-right: 0.5rem;
  color: var(--accent);
}

/* ── Shell timeline (raw to finished) ────────────────── */

.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  margin-top: 3rem;
}

.timeline-step {
  background: var(--bg);
  padding: 1.5rem;
  position: relative;
}

.timeline-step .step-num {
  font-family: "Cormorant Garamond", serif;
  font-style: italic;
  font-size: 1.8rem;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 1rem;
}

.timeline-step h4 { margin-bottom: 0.5rem; }

.timeline-step p {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.55;
}

/* ── Featured wide image ────────────────────────────── */

.feature-wide {
  width: 100%;
  aspect-ratio: 21/9;
  overflow: hidden;
  border-radius: var(--r);
  margin: clamp(2rem, 4vw, 4rem) 0;
}

.feature-wide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1s var(--ease);
}

.feature-wide:hover img { transform: scale(1.03); }

/* ── Mosaic grid (chapter studio life) ───────────────── */

.mosaic {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-auto-rows: minmax(180px, auto);
  gap: clamp(0.5rem, 1vw, 1rem);
}

.mosaic .figure {
  height: 100%;
}

.m-1 { grid-column: span 7; grid-row: span 2; }
.m-2 { grid-column: span 5; grid-row: span 1; }
.m-3 { grid-column: span 5; grid-row: span 1; }
.m-4 { grid-column: span 4; grid-row: span 2; }
.m-5 { grid-column: span 4; grid-row: span 1; }
.m-6 { grid-column: span 4; grid-row: span 1; }

/* ── Two-up layout (text + image) ─────────────────── */

.two-up {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}

.two-up.reverse {
  direction: rtl;
}

.two-up.reverse > * {
  direction: ltr;
}

/* ── Quote ────────────────────────────────────────── */

.quote-block {
  padding: clamp(3rem, 6vw, 5rem) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: clamp(4rem, 8vw, 7rem) 0;
}

.quote-block blockquote {
  font-family: "Cormorant Garamond", serif;
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.65rem, 3.5vw, 2.85rem);
  line-height: 1.3;
  color: var(--text);
  max-width: 1100px;
}

.quote-block blockquote::before {
  content: "“";
  display: block;
  font-size: clamp(4rem, 8vw, 7rem);
  color: var(--accent);
  line-height: 0.5;
  margin-bottom: 1rem;
}

.quote-block cite {
  display: block;
  margin-top: 2rem;
  font-style: normal;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.quote-block cite strong {
  color: var(--text);
  font-weight: 500;
}

/* ── Films / videos ───────────────────────────────── */

.film-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: clamp(0.75rem, 1.5vw, 1.25rem);
}

.film-card {
  position: relative;
  border-radius: var(--r);
  overflow: hidden;
  background: var(--bg-card);
  cursor: pointer;
  aspect-ratio: 4/3;
}

.film-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease), opacity 0.3s;
}

.film-card:hover img { transform: scale(1.05); opacity: 0.85; }

.film-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.film-play-disc {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  border: 1.5px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s, border-color 0.3s, transform 0.3s;
}

.film-card:hover .film-play-disc {
  background: var(--accent);
  border-color: var(--accent);
  transform: scale(1.1);
}

.film-play-disc svg { width: 22px; height: 22px; fill: var(--text); margin-left: 3px; }

.film-tag {
  position: absolute;
  top: 1rem;
  left: 1rem;
  padding: 0.3rem 0.65rem;
  background: rgba(14,13,12,0.7);
  backdrop-filter: blur(4px);
  border-radius: 999px;
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
}

/* ── Acknowledgments ─────────────────────────────── */

#thanks {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
}

.thanks-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: clamp(2.5rem, 5vw, 4.5rem);
  position: relative;
  overflow: hidden;
}

.thanks-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
}

.thanks-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}

.thanks-name {
  font-family: "Cormorant Garamond", serif;
  font-style: italic;
  font-size: clamp(2rem, 3.5vw, 2.85rem);
  color: var(--text);
  line-height: 1.15;
  margin-bottom: 0.5rem;
}

.thanks-title {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.thanks-list {
  list-style: none;
  padding: 0;
  margin-top: 2rem;
}

.thanks-list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.thanks-list li::before {
  content: "↳";
  color: var(--accent);
}

/* ── Gallery ───────────────────────────────────── */

#gallery { background: var(--bg-soft); }

.gallery-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0 3rem;
}

.filter-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.55rem 1.15rem;
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: all 0.25s var(--ease);
  font-family: inherit;
}

.filter-btn:hover { color: var(--text); border-color: var(--text-dim); }

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.masonry {
  columns: 4;
  column-gap: clamp(0.5rem, 1vw, 1rem);
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: clamp(0.5rem, 1vw, 1rem);
  border-radius: var(--r);
  overflow: hidden;
  cursor: zoom-in;
  position: relative;
  background: var(--bg);
}

.masonry-item img {
  width: 100%;
  height: auto;
  transition: transform 0.5s var(--ease), opacity 0.3s;
}

.masonry-item:hover img { transform: scale(1.04); }

.load-more-row { text-align: center; margin-top: 3rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 2rem;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--text-dim);
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition: all 0.25s var(--ease);
  font-family: inherit;
}

.btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

/* ── Lightbox ──────────────────────────────────── */

.lb-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(8, 7, 6, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.lb-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.lb-stage {
  position: relative;
  max-width: 95vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lb-stage img,
.lb-stage video {
  max-width: 95vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--r);
}

.lb-close,
.lb-nav {
  position: absolute;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
  backdrop-filter: blur(10px);
}

.lb-close { top: 1.5rem; right: 1.5rem; width: 44px; height: 44px; font-size: 1.25rem; }
.lb-nav   { top: 50%; transform: translateY(-50%); width: 52px; height: 52px; font-size: 1.5rem; }
.lb-nav.prev { left: 1.5rem; }
.lb-nav.next { right: 1.5rem; }

.lb-close:hover, .lb-nav:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.lb-counter {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
}

/* ── Footer ──────────────────────────────────────── */

footer {
  background: var(--bg);
  border-top: 1px solid var(--line);
  padding: clamp(3rem, 6vw, 5rem) 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  margin-top: 1rem;
  color: var(--text-dim);
  font-size: 0.9rem;
  max-width: 360px;
}

.footer-col h5 {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
  font-family: inherit;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.6rem; }
.footer-col a {
  font-size: 0.88rem;
  color: var(--text-dim);
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

/* ── Reveal animation ────────────────────────────── */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.in { opacity: 1; transform: none; }
.reveal.d2 { transition-delay: 0.1s; }
.reveal.d3 { transition-delay: 0.2s; }
.reveal.d4 { transition-delay: 0.3s; }

/* ── Responsive ─────────────────────────────────── */

@media (max-width: 1100px) {
  .masonry { columns: 3; }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-grid .footer-col:last-child { grid-column: span 3; }
}

@media (max-width: 920px) {
  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.1rem; letter-spacing: 0.12em; }
  .nav-toggle { display: block; }

  .intro-grid { grid-template-columns: 1fr; gap: 2rem; }
  .intro-grid > div:first-child { position: static; }
  .compare-grid { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr 1fr; }
  .two-up { grid-template-columns: 1fr; gap: 2rem; }
  .two-up.reverse { direction: ltr; }
  .metrics { grid-template-columns: 1fr 1fr; }

  .mosaic {
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: 220px;
  }
  .m-1, .m-2, .m-3, .m-4, .m-5, .m-6 { grid-column: span 1; grid-row: span 1; }
  .m-1 { grid-column: span 2; }

  .masonry { columns: 2; }
  .thanks-grid { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid .footer-col:last-child { grid-column: auto; }

  .chapter-head { flex-direction: column; gap: 0.5rem; }
}

@media (max-width: 560px) {
  .timeline { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr; }
  .masonry { columns: 1; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-meta { gap: 1.25rem; }
  .lb-close { top: 1rem; right: 1rem; }
  .lb-nav.prev { left: 0.5rem; }
  .lb-nav.next { right: 0.5rem; }
  .lb-nav { width: 42px; height: 42px; font-size: 1.2rem; }
}