/* ============================================================
   Farpost Field Documentation — Design System
   Subject: rural Ontario drone + interior documentation service
   Signature device: topographic contour lines (land seen from above)
   ============================================================ */

:root {
  /* Color */
  --stone:        #E8E2D4;  /* warm topo-paper background */
  --stone-light:  #FAFAF7;  /* off-white, body backgrounds */
  --ink:          #15191F;  /* near-black navy, headlines/nav */
  --pine:         #3A4A3E;  /* deep North Hastings forest green */
  --rust:         #C45A28;  /* burnt terracotta — sunset/dirt-road accent */
  --rust-dark:    #A8481E;
  --line:         #C9C0AC;  /* hairline rule on stone */
  --line-dark:    rgba(255,255,255,0.12);
  --ink-soft:     #4A4F58;  /* secondary text on light */

  /* Type */
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --step-0: clamp(1rem, 0.95rem + 0.2vw, 1.05rem);
  --step-1: clamp(1.25rem, 1.15rem + 0.4vw, 1.4rem);
  --step-2: clamp(1.6rem, 1.4rem + 0.8vw, 2rem);
  --step-3: clamp(2.1rem, 1.7rem + 1.6vw, 3rem);
  --step-4: clamp(2.8rem, 2.1rem + 2.8vw, 4.6rem);

  --maxw: 1180px;
  --pad: clamp(1.25rem, 4vw, 3rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--stone-light);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  margin: 0;
  letter-spacing: -0.01em;
}

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

/* ---------- Topographic contour motif ---------- */
/* Used as section dividers and hero background texture.
   Hand-built concentric paths suggesting elevation contours —
   not decoration, it's literally what the drone sees. */

.contour-divider {
  width: 100%;
  height: 64px;
  display: block;
  margin: 0;
}

.contour-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.5;
  pointer-events: none;
}

/* ---------- Nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 2px;
}
.brand .farpost { color: var(--ink); }
.brand .field { color: var(--rust); }

.nav-links {
  display: flex;
  gap: clamp(1.25rem, 3vw, 2.25rem);
  font-size: 0.92rem;
  font-weight: 500;
}
.nav-links a {
  position: relative;
  padding: 0.25rem 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--rust);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: 76px; left: 0; right: 0;
    background: var(--stone-light);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .nav-links.open { max-height: 320px; }
  .nav-links a {
    padding: 1rem var(--pad);
    border-bottom: 1px solid var(--line);
    width: 100%;
  }
  .nav-toggle { display: block; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 1.6rem;
  border-radius: 2px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-primary {
  background: var(--rust);
  color: var(--stone-light);
}
.btn-primary:hover { background: var(--rust-dark); }
.btn-ghost {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--stone-light); }
.btn-ghost-light {
  background: transparent;
  border-color: rgba(250,250,247,0.5);
  color: var(--stone-light);
}
.btn-ghost-light:hover { background: var(--stone-light); color: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: var(--ink);
  color: var(--stone-light);
  overflow: hidden;
  padding: clamp(3.5rem, 10vw, 7rem) 0 clamp(3rem, 8vw, 5rem);
}
.hero .wrap {
  position: relative;
  z-index: 2;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 1.25rem;
}
.hero h1 {
  font-size: var(--step-4);
  max-width: 14ch;
  color: var(--stone-light);
}
.hero h1 em {
  font-style: italic;
  color: var(--rust);
}
.hero-sub {
  font-size: var(--step-1);
  color: rgba(250,250,247,0.78);
  max-width: 38ch;
  margin-top: 1.5rem;
  font-weight: 400;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2.25rem;
  flex-wrap: wrap;
}
.hero-coords {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(250,250,247,0.45);
  margin-top: 3rem;
  letter-spacing: 0.03em;
}

/* ---------- Sections ---------- */
section { padding: clamp(3rem, 8vw, 5.5rem) 0; }
.section-light { background: var(--stone-light); }
.section-stone { background: var(--stone); }

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 0.75rem;
  display: block;
}

.section-head {
  max-width: 56ch;
  margin-bottom: clamp(2rem, 5vw, 3rem);
}
.section-head h2 {
  font-size: var(--step-3);
}
.section-head p {
  font-size: var(--step-1);
  color: var(--ink-soft);
  margin-top: 1rem;
  font-weight: 400;
}

/* ---------- Service / pricing cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--stone-light);
  border: 1px solid var(--line);
  padding: 2rem;
  position: relative;
}
.card.featured {
  border-color: var(--rust);
  background: #fff;
}
.card.featured::before {
  content: 'Most booked';
  position: absolute;
  top: -1px; right: -1px;
  background: var(--rust);
  color: var(--stone-light);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.3rem 0.7rem;
}
.card h3 {
  font-size: var(--step-1);
  margin-bottom: 0.4rem;
}
.card-price {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  color: var(--rust);
  margin: 0.75rem 0 1.25rem;
}
.card-price sup {
  font-size: 0.5em;
  font-weight: 600;
}
.card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.card li {
  padding: 0.5rem 0;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 0.6rem;
}
.card li:first-child { border-top: none; }
.card li::before {
  content: '—';
  color: var(--rust);
  flex-shrink: 0;
}

/* ---------- Why-Robin / differentiator strip ---------- */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
}
.diff-item .diff-mark {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--rust);
  margin-bottom: 0.6rem;
}
.diff-item h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}
.diff-item p {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* ---------- Gallery grid ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}
.gallery-item {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--stone);
  cursor: pointer;
}
.gallery-item.tall { aspect-ratio: 4/5; grid-row: span 2; }
.gallery-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.gallery-item:hover img { transform: scale(1.04); }
.gallery-caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 0.9rem 1rem;
  background: linear-gradient(to top, rgba(21,25,31,0.85), transparent);
  color: var(--stone-light);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.gallery-item:hover .gallery-caption { opacity: 1; }

@media (max-width: 860px) {
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-item.tall { grid-row: span 1; aspect-ratio: 4/3; }
}
@media (max-width: 540px) {
  .gallery-grid { grid-template-columns: 1fr; }
}

.gallery-filter {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  color: var(--ink-soft);
  transition: all 0.2s ease;
}
.filter-btn.active, .filter-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
  background: var(--stone);
}

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(21,25,31,0.96);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 2rem;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
}
.lightbox-close {
  position: absolute;
  top: 1.5rem; right: 1.5rem;
  color: var(--stone-light);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: none;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 0.5rem 1rem;
  cursor: pointer;
}
.lightbox-close:hover { border-color: #fff; }

/* ---------- Process steps ---------- */
.process {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.process-step {
  padding: 2rem 1.75rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.process-step .pnum {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--rust);
  display: block;
  margin-bottom: 1rem;
}
.process-step h3 { font-size: 1.05rem; margin-bottom: 0.5rem; }
.process-step p { font-size: 0.9rem; color: var(--ink-soft); }

/* ---------- Coverage map note ---------- */
.coverage {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
@media (max-width: 800px) {
  .coverage { grid-template-columns: 1fr; }
}
.coverage-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.coverage-list li {
  padding: 0.6rem 0;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
}
.coverage-list li:first-child { border-top: none; }
.coverage-list .dist { color: var(--rust); }

/* ---------- Contact form ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(2rem, 5vw, 4rem);
}
@media (max-width: 800px) {
  .contact-grid { grid-template-columns: 1fr; }
}
.field-group { margin-bottom: 1.4rem; }
label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.5rem;
}
input, select, textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.8rem 1rem;
  border: 1.5px solid var(--line);
  background: var(--stone-light);
  color: var(--ink);
  border-radius: 2px;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--rust);
}
textarea { resize: vertical; min-height: 120px; }

.contact-info {
  font-size: 0.95rem;
  color: var(--ink-soft);
}
.contact-info h3 { color: var(--ink); margin-bottom: 1rem; font-size: 1.3rem; }
.contact-info .info-row {
  display: flex;
  gap: 0.75rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
}
.contact-info .info-row:first-of-type { border-top: none; }
.contact-info .info-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--rust);
  width: 90px;
  flex-shrink: 0;
  padding-top: 0.15rem;
}

.form-success {
  display: none;
  background: var(--pine);
  color: var(--stone-light);
  padding: 1.5rem;
  font-size: 0.95rem;
}
.form-success.show { display: block; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(250,250,247,0.6);
  padding: 3rem 0 2rem;
  font-size: 0.85rem;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  border-bottom: 1px solid var(--line-dark);
  padding-bottom: 2rem;
  margin-bottom: 1.5rem;
}
.footer-brand .brand .farpost { color: var(--stone-light); }
.footer-tag {
  font-size: 0.85rem;
  margin-top: 0.5rem;
  max-width: 32ch;
  color: rgba(250,250,247,0.5);
}
.footer-links {
  display: flex;
  gap: 2.5rem;
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(250,250,247,0.4);
  margin-bottom: 0.8rem;
}
.footer-col a {
  display: block;
  padding: 0.3rem 0;
  color: rgba(250,250,247,0.7);
}
.footer-col a:hover { color: var(--rust); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.78rem;
  color: rgba(250,250,247,0.35);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}

/* ---------- Focus visibility ---------- */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 2px;
}