/*
 * Plateau Lane Studios — shared design system
 * Single stylesheet for all pages. Page scoping via body class:
 *   index.html          → <body class="page-home">
 *   pls-fabrication.html → <body class="page-fabrication">
 */

/* ─── CUSTOM PROPERTIES ─── */
:root {
  color-scheme: dark;
  --bg-deep: #0a0a0c;
  --bg-panel: #111114;
  --bg-card: #18181c;
  --border-subtle: #2a2a30;
  --text-primary: #e8e6e3;
  --text-secondary: #9a9890;
  --text-muted: #848280;
  --accent-amber: #f59e0b;
  --accent-amber-dim: #b27308;
  --accent-amber-glow: rgba(245, 158, 11, 0.15);
  --font-display: 'Outfit', sans-serif;
  --font-mono: 'DM Mono', monospace;
}

/* Fabrication-page custom properties — inherited by all children of body.page-fabrication */
.page-fabrication {
  --accent-red: #ef4444;
  --accent-green: #22c55e;
  --spark-orange: #fb923c;
  --border-accent: #f59e0b;
}

/* ─── RESET ─── */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-display);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-synthesis: none;
}

/* ─── GRAIN OVERLAY ─── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ─── MOBILE NAV TOGGLE ─── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 101;
}

.nav-toggle-bar {
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  transition: transform 0.3s, opacity 0.3s;
  transform-origin: center;
}

.nav-toggle:hover .nav-toggle-bar { background: var(--accent-amber); }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─── NAVIGATION — SHARED ─── */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  padding: 1.1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(10, 10, 12, 0.88);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active { color: var(--accent-amber); }

/* ─── NAVIGATION — INDEX (page-home) ─── */
.nav-brand-text {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.1em;
  text-transform: lowercase;
  text-decoration: none;
  transition: color 0.3s;
}

.nav-brand-text:hover { color: var(--accent-amber); }

.nav-mark {
  width: 26px;
  height: 26px;
  object-fit: contain;
  flex-shrink: 0;
  opacity: 0.9;
  transition: opacity 0.3s;
}

.nav-brand-text:hover .nav-mark,
.nav-brand-parent:hover .nav-mark { opacity: 1; }

/* ─── NAVIGATION — FABRICATION (page-fabrication) ─── */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-brand-parent {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  text-transform: lowercase;
  text-decoration: none;
  transition: color 0.3s;
}

.nav-brand-parent:hover { color: var(--text-primary); }

.nav-brand-sep {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--border-subtle);
  margin: 0 0.6rem;
  font-weight: 300;
}

.nav-brand-sub {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--accent-amber);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ─── HERO — SHARED ─── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 2rem 4rem;
  position: relative;
  overflow: hidden;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-amber);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: fadeSlideIn 0.8s ease-out both;
}

.hero-tag::before {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background: var(--accent-amber);
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 2rem;
  text-wrap: balance;
  animation: fadeSlideIn 0.8s ease-out 0.15s both;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent-amber);
  position: relative;
}

.hero-sub {
  font-size: 1.2rem;
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.8;
  margin-bottom: 3rem;
  text-wrap: pretty;
  animation: fadeSlideIn 0.8s ease-out 0.3s both;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bg-deep);
  background: var(--accent-amber);
  padding: 1rem 2rem;
  text-decoration: none;
  transition: all 0.3s;
  animation: fadeSlideIn 0.8s ease-out 0.45s both;
}

.hero-cta:hover {
  background: #fbbf24;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-amber-glow);
}

.hero-cta .arrow { transition: transform 0.3s; }
.hero-cta:hover .arrow { transform: translateX(4px); }

/* ─── HERO AMBIENT GLOW — page-specific ─── */
@keyframes pulse {
  0%, 100% { opacity: 0.35; transform: scale(1); }
  50%       { opacity: 0.60; transform: scale(1.08); }
}

@keyframes pulse-fab {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50%       { opacity: 0.7; transform: scale(1.1); }
}

.page-home .hero::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -5%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, var(--accent-amber-glow) 0%, transparent 65%);
  pointer-events: none;
  animation: pulse 7s ease-in-out infinite;
}

.page-fabrication .hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-amber-glow) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse-fab 6s ease-in-out infinite;
}

/* Fabrication hero-sub is wider */
.page-fabrication .hero-sub { max-width: 680px; }

/* ─── SECTION FOUNDATIONS ─── */
section {
  padding: 6rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
  scroll-margin-top: 5rem;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-amber);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 1px;
  background: var(--accent-amber-dim);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  text-wrap: balance;
}

.section-body {
  font-size: 1.05rem;
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 720px;
  line-height: 1.85;
  text-wrap: pretty;
}

/* ─── DIVIDER ─── */
.divider {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

.divider-line {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle) 20%, var(--border-subtle) 80%, transparent);
}

/* ─── FOOTER ─── */
footer {
  padding: 3rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: color 0.3s;
}

.footer-links a:hover { color: var(--accent-amber); }

/* ─── FOCUS ─── */
:focus-visible {
  outline: 2px solid var(--accent-amber);
  outline-offset: 3px;
}

/* ─── FORM VALIDATION ERROR STATE ─── */
.form-input.form-input--error,
.form-textarea.form-textarea--error {
  border-color: #ef4444;
}

/* ─── SECTION LABEL VARIANT ─── */
.section-label--center { justify-content: center; }

/* ─── APPROACH TIMELINE LINKS ─── */
.step a {
  color: var(--accent-amber);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-amber-dim);
  transition: border-color 0.3s;
}

.step a:hover { border-bottom-color: var(--accent-amber); }

/* ─── OSS CALLOUT VARIANTS ─── */
.oss-callout + .oss-callout { margin-top: 1rem; }

.oss-icon--sm {
  font-size: 1.4rem;
  margin-top: 0.1rem;
}

.oss-disclaimer {
  margin-top: 0.75rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ═══════════════════════════════════════
   INDEX PAGE (page-home)
   ═══════════════════════════════════════ */

/* ─── ABOUT ─── */
.about-body {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem 4rem;
}

.about-para {
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.9;
  text-wrap: pretty;
}

.about-para:first-child {
  grid-column: 1 / -1;
  font-size: 1.15rem;
  color: var(--text-primary);
  font-weight: 400;
  max-width: 800px;
}

/* ─── SERVICES ─── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.service-card {
  padding: 2.25rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  transition: border-color 0.3s, transform 0.3s;
}

.service-card:hover {
  border-color: var(--accent-amber-dim);
  transform: translateY(-3px);
}

.service-number {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 300;
  color: var(--accent-amber-dim);
  line-height: 1;
  margin-bottom: 1.25rem;
}

.service-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.service-card p {
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ─── FEATURED PROJECT ─── */
.featured-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem 6rem;
}

.featured-project {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  overflow: hidden;
  transition: border-color 0.4s;
}

.featured-project:hover { border-color: var(--accent-amber-dim); }

.featured-text {
  padding: 3rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.featured-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-amber);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.featured-eyebrow::before {
  content: '';
  display: block;
  width: 20px;
  height: 1px;
  background: var(--accent-amber-dim);
}

.featured-text h2 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  text-wrap: balance;
}

.featured-text h2 em {
  font-style: normal;
  color: var(--accent-amber);
}

.featured-text p {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
  text-wrap: pretty;
}

.featured-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bg-deep);
  background: var(--accent-amber);
  padding: 0.85rem 1.75rem;
  text-decoration: none;
  transition: all 0.3s;
  align-self: flex-start;
}

.featured-link:hover {
  background: #fbbf24;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-amber-glow);
}

.featured-link .arrow { transition: transform 0.3s; }
.featured-link:hover .arrow { transform: translateX(4px); }

.featured-image {
  position: relative;
  overflow: hidden;
  min-height: 360px;
}

.featured-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.6) brightness(0.75);
  transition: filter 0.5s, transform 0.5s;
}

.featured-project:hover .featured-image img {
  filter: saturate(0.85) brightness(0.9);
  transform: scale(1.04);
}

.featured-image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--bg-panel) 0%, transparent 40%);
  pointer-events: none;
}

/* ─── CONTACT BAND ─── */
.contact-band {
  background: var(--bg-panel);
  border-top: 1px solid var(--border-subtle);
  padding: 6rem 2rem;
  scroll-margin-top: 5rem;
}

.contact-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 5rem;
  align-items: start;
}

.contact-left .section-title { margin-bottom: 1rem; }

.contact-left p {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.85;
  text-wrap: pretty;
}

/* ─── CONTACT FORM ─── */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.form-group label .req {
  color: var(--accent-amber);
  margin-left: 0.2rem;
}

.form-input,
.form-textarea {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 300;
  padding: 0.85rem 1rem;
  outline: none;
  transition: border-color 0.3s;
  width: 100%;
  resize: vertical;
}

.form-input::placeholder,
.form-textarea::placeholder { color: var(--text-muted); }

.form-input:focus,
.form-textarea:focus { border-color: var(--accent-amber-dim); }

.form-textarea {
  min-height: 140px;
  line-height: 1.6;
}

.form-submit {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bg-deep);
  background: var(--accent-amber);
  padding: 1rem 2rem;
  border: none;
  cursor: pointer;
  transition: all 0.3s;
  align-self: flex-start;
}

.form-submit:hover {
  background: #fbbf24;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-amber-glow);
}

.form-submit .arrow { transition: transform 0.3s; }
.form-submit:hover .arrow { transform: translateX(4px); }

.form-success {
  display: none;
  padding: 2rem;
  border: 1px solid var(--accent-amber-dim);
  background: rgba(245, 158, 11, 0.05);
}

.form-success h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-amber);
  margin-bottom: 0.5rem;
}

.form-success p {
  font-size: 0.9rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ═══════════════════════════════════════
   FABRICATION PAGE (page-fabrication)
   ═══════════════════════════════════════ */

/* ─── PROBLEM / SOLUTION GRID ─── */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 3rem;
}

.problem-card,
.solution-card {
  padding: 2.25rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s;
}

.problem-card:hover,
.solution-card:hover { transform: translateY(-3px); }

.problem-card { border-left: 3px solid var(--accent-red); }
.problem-card:hover { border-color: var(--accent-red); }

.solution-card { border-left: 3px solid var(--accent-green); }
.solution-card:hover { border-color: var(--accent-green); }

.card-icon {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.problem-card .card-icon { color: var(--accent-red); }
.solution-card .card-icon { color: var(--accent-green); }

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.card-text {
  font-size: 0.92rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.75;
  text-wrap: pretty;
}

/* ─── VIDEO EMBED ─── */
.video-wrap {
  margin-top: 3rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  overflow: hidden;
}

.video-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.video-header-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-amber);
}

.video-header-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-red);
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}

.video-wrap video {
  width: 100%;
  display: block;
  background: #000;
  max-height: 520px;
  object-fit: contain;
}

.video-caption {
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border-subtle);
  text-wrap: pretty;
}

.video-caption strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* ─── COMPARISON STRIP ─── */
.compare-strip {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  margin-top: 3rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  overflow: hidden;
}

.compare-col { padding: 2.5rem; }
.compare-col.old { background: rgba(239, 68, 68, 0.03); }
.compare-col.new { background: rgba(34, 197, 94, 0.03); }

.compare-divider {
  width: 1px;
  background: var(--border-subtle);
  position: relative;
}

.compare-divider::after {
  content: '→';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-panel);
  color: var(--accent-amber);
  font-size: 1.5rem;
  padding: 0.5rem;
  line-height: 1;
}

.compare-heading {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.compare-col.old .compare-heading { color: var(--accent-red); }
.compare-col.new .compare-heading { color: var(--accent-green); }

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.spec-row:last-child { border-bottom: none; }

.spec-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 400;
}

.spec-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* ─── OPEN SOURCE CALLOUT ─── */
.oss-callout {
  margin-top: 3rem;
  padding: 2rem 2.25rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
}

.oss-icon {
  font-size: 1.8rem;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.oss-callout h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.oss-callout p {
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.7;
  text-wrap: pretty;
}

.oss-callout a {
  color: var(--accent-amber);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-amber-dim);
  transition: border-color 0.3s;
}

.oss-callout a:hover { border-bottom-color: var(--accent-amber); }

/* ─── PHOTO GRID ─── */
.photo-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.photo-grid--2 { grid-template-columns: repeat(2, 1fr); }
.photo-grid--3 { grid-template-columns: repeat(3, 1fr); }

.photo-card {
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  overflow: hidden;
  transition: border-color 0.3s;
}

.photo-card:hover { border-color: var(--accent-amber-dim); }

.photo-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
  filter: saturate(0.75) brightness(0.88);
  transition: filter 0.4s, transform 0.4s;
}

.photo-card:hover img {
  filter: saturate(1) brightness(1);
  transform: scale(1.03);
}

.photo-caption {
  padding: 0.7rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  line-height: 1.5;
  border-top: 1px solid var(--border-subtle);
}

/* ─── BUILD COMPARISON (diff layout) ─── */
.build-compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  margin-top: 3rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  overflow: hidden;
}

.build-compare-col { padding: 2.5rem; }
.build-compare-col--before { background: rgba(239, 68, 68, 0.03); }
.build-compare-col--after  { background: rgba(34, 197, 94, 0.03); }

.build-compare-divider {
  width: 1px;
  background: var(--border-subtle);
  position: relative;
}

.build-compare-divider::after {
  content: '→';
  position: absolute;
  top: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-panel);
  color: var(--accent-amber);
  font-size: 1.5rem;
  padding: 0.5rem;
  line-height: 1;
}

.build-compare-heading {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.build-compare-col--before .build-compare-heading { color: var(--accent-red); }
.build-compare-col--after  .build-compare-heading { color: var(--accent-green); }

.build-compare-col h3 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
}

.build-compare-col > p {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 0;
  text-wrap: pretty;
}

/* ─── BUILD PHASES ─── */
.build-phase {
  margin-top: 4rem;
  padding-top: 3.5rem;
  border-top: 1px solid var(--border-subtle);
}

.build-phase-header {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  margin-bottom: 1rem;
}

.build-phase-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-amber-dim);
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  padding: 0.25rem 0.6rem;
  white-space: nowrap;
}

.build-phase-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.build-phase > p {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 740px;
  margin-bottom: 0.25rem;
  text-wrap: pretty;
}

/* ─── APPROACH TIMELINE ─── */
.approach-steps {
  margin-top: 3rem;
  position: relative;
  padding-left: 3rem;
}

.approach-steps::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--accent-amber), var(--accent-amber-dim), transparent);
}

.step {
  position: relative;
  padding-bottom: 2.5rem;
}

.step:last-child { padding-bottom: 0; }

.step::before {
  content: '';
  position: absolute;
  left: -3rem;
  top: 0.55rem;
  width: 9px;
  height: 9px;
  background: var(--accent-amber);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-amber-glow);
  transform: translateX(-4px);
}

.step-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-amber-dim);
  margin-bottom: 0.5rem;
}

.step h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.step p {
  font-size: 0.92rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 680px;
  text-wrap: pretty;
}


/* ─── CTA BAND ─── */
.cta-band {
  background: var(--bg-panel);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding: 5rem 2rem;
  text-align: center;
  max-width: 100%;
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, var(--accent-amber-glow) 0%, transparent 65%);
  pointer-events: none;
}

.cta-band .section-title {
  max-width: 700px;
  margin: 0 auto 1rem;
  position: relative;
}

.cta-band .section-body {
  max-width: 560px;
  margin: 0 auto 2.5rem;
  text-align: center;
  position: relative;
}

.cta-band .hero-cta {
  animation: none;
  position: relative;
}

/* ═══════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════ */
@media (max-width: 900px) {
  /* index */
  .featured-project { grid-template-columns: 1fr; }
  .featured-image { min-height: 260px; order: -1; }
  .featured-image-overlay { background: linear-gradient(180deg, transparent 60%, var(--bg-panel) 100%); }
  .contact-inner { grid-template-columns: 1fr; gap: 3rem; }
  .services-grid { grid-template-columns: 1fr; }
  /* fabrication */
  .photo-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .build-compare { grid-template-columns: 1fr; }
  .build-compare-divider { width: 100%; height: 1px; }
  .build-compare-divider::after { content: '↓'; top: 50%; transform: translate(-50%, -50%); }
}

@media (max-width: 768px) {
  /* shared */
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(10, 10, 12, 0.97);
    backdrop-filter: blur(20px);
    padding: 5rem 2rem 2rem;
    z-index: 99;
    transform: translateY(-110%);
    transition: transform 0.3s ease;
    border-bottom: 1px solid var(--border-subtle);
  }

  .nav-links.is-open { transform: translateY(0); }

  .nav-links li { border-bottom: 1px solid var(--border-subtle); }
  .nav-links li:first-child { border-top: 1px solid var(--border-subtle); }

  .nav-links a {
    display: block;
    padding: 1rem 0;
    font-size: 0.8rem;
  }

  footer { flex-direction: column; gap: 1rem; text-align: center; }
  /* index */
  .about-body { grid-template-columns: 1fr; }
  .about-para:first-child { grid-column: auto; }
  .form-row { grid-template-columns: 1fr; }
  /* fabrication */
  .problem-grid { grid-template-columns: 1fr; }
  .compare-strip { grid-template-columns: 1fr; }
  .compare-divider { width: 100%; height: 1px; }
  .compare-divider::after { content: '↓'; }
  .photo-grid--2,
  .photo-grid--3 { grid-template-columns: 1fr; }
  .build-phase-header { flex-direction: column; gap: 0.5rem; }
  .oss-callout { flex-direction: column; }
}

/* ─── REDUCED MOTION ─── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}
