/* ==========================================================
   RESINOX COATINGS — DESIGN SYSTEM
   Restrained palette pulled from the brand logo (olive-gold on
   charcoal/stone). No CSS framework - hand-written, mobile-first.
   ========================================================== */

:root {
  --color-ink: #1c1b16;
  --color-ink-soft: #4a4940;
  --color-brand: #6b5a1e;
  --color-brand-dark: #4f4216;
  --color-brand-light: #9c8636;
  --color-stone: #faf8f3;
  --color-stone-dark: #f0ece1;
  --color-border: #e2ddce;
  --color-white: #ffffff;
  --color-success: #2f6b3a;
  --color-danger: #a13a3a;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 6.5rem;

  --radius: 10px;
  --radius-lg: 18px;
  --shadow: 0 1px 3px rgba(28, 27, 22, 0.08), 0 1px 2px rgba(28, 27, 22, 0.06);
  --shadow-lg: 0 20px 40px -12px rgba(28, 27, 22, 0.25);
  --max-width: 1240px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-stone);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-2);
}
@media (min-width: 768px) {
  .container { padding-inline: var(--space-4); }
}

h1, h2, h3, h4 { line-height: 1.15; margin: 0 0 var(--space-2); font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); }
h3 { font-size: 1.3rem; }
p { margin: 0 0 var(--space-2); color: var(--color-ink-soft); }

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-brand);
  margin-bottom: var(--space-1);
}

.section { padding-block: var(--space-6); }
.section--tight { padding-block: var(--space-5); }
.section--alt { background: var(--color-stone-dark); }
.section-head { max-width: 640px; margin-bottom: var(--space-4); }
.section-head.center { margin-inline: auto; text-align: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--color-brand); color: var(--color-white); }
.btn-primary:hover { background: var(--color-brand-dark); }
.btn-secondary { background: transparent; color: var(--color-white); border-color: rgba(255, 255, 255, 0.55); }
.btn-secondary:hover { background: rgba(255, 255, 255, 0.12); }
.btn-outline { background: transparent; color: var(--color-brand); border-color: var(--color-brand); }
.btn-outline:hover { background: var(--color-brand); color: var(--color-white); }
.btn-block { width: 100%; }
.btn-lg { padding: 1rem 2rem; font-size: 1.02rem; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 248, 243, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: 0.9rem;
}
.brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 800; font-size: 1.15rem; color: var(--color-ink); }
.brand img { height: 68px; width: auto; }

.main-nav { display: none; align-items: center; gap: var(--space-3); }
.main-nav a { font-weight: 600; font-size: 0.94rem; color: var(--color-ink-soft); }
.main-nav a:hover { color: var(--color-brand); }
.header-actions { display: flex; align-items: center; gap: var(--space-2); }
.header-actions .phone-link { display: none; font-weight: 700; font-size: 0.92rem; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  cursor: pointer;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-ink);
  position: relative;
  transition: 0.2s;
}
.nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-white);
}
.mobile-nav.is-open { display: flex; }
.mobile-nav a {
  padding: 0.95rem var(--space-2);
  border-bottom: 1px solid var(--color-border);
  font-weight: 600;
}
.mobile-nav .btn { margin: var(--space-2); }

@media (min-width: 960px) {
  .main-nav { display: flex; }
  .header-actions .phone-link { display: inline-flex; align-items: center; gap: 0.4rem; }
  .nav-toggle { display: none; }
  .mobile-nav { display: none !important; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  color: var(--color-white);
  background: linear-gradient(135deg, var(--color-ink) 0%, var(--color-brand-dark) 55%, var(--color-brand) 100%);
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}
.hero__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(20, 19, 14, 0.88) 0%, rgba(79, 66, 22, 0.78) 55%, rgba(107, 90, 30, 0.7) 100%);
}
.hero__inner {
  position: relative;
  padding-block: var(--space-7) var(--space-6);
  max-width: 760px;
}
.hero p.lead { color: rgba(255, 255, 255, 0.88); font-size: 1.15rem; max-width: 560px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
.hero__trustbar {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-4);
  margin-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 0.88rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
}

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: var(--space-3); }
.grid-2 { grid-template-columns: repeat(1, 1fr); }
.grid-3 { grid-template-columns: repeat(1, 1fr); }
.grid-4 { grid-template-columns: repeat(1, 1fr); }
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  display: flex;
  flex-direction: column;
}
a.card:hover, .card.is-hoverable:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card__media { aspect-ratio: 4 / 3; overflow: hidden; background: var(--color-stone-dark); }
.card__media img { width: 100%; height: 100%; object-fit: cover; }
.card__body { padding: var(--space-3); flex: 1; display: flex; flex-direction: column; gap: 0.4rem; }
.card__meta { font-size: 0.82rem; color: var(--color-brand); font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
.card__title { font-size: 1.1rem; font-weight: 700; margin: 0; }
.card__excerpt { font-size: 0.92rem; color: var(--color-ink-soft); margin: 0; }
.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: var(--color-stone-dark);
  color: var(--color-brand-dark);
}

/* ---------- Trust strip ---------- */
.trust-strip { display: grid; gap: var(--space-3); grid-template-columns: repeat(2, 1fr); }
@media (min-width: 768px) { .trust-strip { grid-template-columns: repeat(4, 1fr); } }
.trust-item { text-align: center; padding: var(--space-3) var(--space-2); }
.trust-item .icon { font-size: 1.8rem; margin-bottom: 0.5rem; }
.trust-item strong { display: block; font-size: 0.95rem; }
.trust-item span { font-size: 0.82rem; color: var(--color-ink-soft); }

/* ---------- Before / after slider ---------- */
.before-after {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  user-select: none;
  touch-action: pan-y;
  box-shadow: var(--shadow-lg);
  background: var(--color-stone-dark);
}
.before-after img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.before-after__after { clip-path: inset(0 0 0 50%); }
.before-after__divider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 3px;
  background: var(--color-white);
  transform: translateX(-50%);
  cursor: ew-resize;
}
.before-after__handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-white);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-brand-dark);
}
.before-after__label {
  position: absolute;
  top: var(--space-2);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: rgba(28, 27, 22, 0.65);
  color: var(--color-white);
}
.before-after__label--before { left: var(--space-2); }
.before-after__label--after { right: var(--space-2); }

/* ---------- Testimonials ---------- */
.testimonial { background: var(--color-white); border-radius: var(--radius-lg); padding: var(--space-3); border: 1px solid var(--color-border); }
.testimonial .stars { color: var(--color-brand); letter-spacing: 0.1em; margin-bottom: 0.5rem; }
.testimonial p { color: var(--color-ink); font-style: italic; }
.testimonial cite { font-style: normal; font-weight: 700; font-size: 0.88rem; color: var(--color-ink-soft); }

/* ---------- CTA banner ---------- */
.cta-banner {
  background: var(--color-ink);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-4);
  text-align: center;
}
.cta-banner h2 { color: var(--color-white); }
.cta-banner p { color: rgba(255, 255, 255, 0.8); }
.cta-banner .hero__actions { justify-content: center; }

/* ---------- Forms ---------- */
.form-field { margin-bottom: var(--space-2); }
.form-field label { display: block; font-weight: 700; font-size: 0.88rem; margin-bottom: 0.35rem; }
.form-field .hint { font-size: 0.8rem; color: var(--color-ink-soft); margin-top: 0.3rem; }
.form-field input[type=text],
.form-field input[type=tel],
.form-field input[type=email],
.form-field input[type=number],
.form-field input[type=file],
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  font-family: inherit;
  font-size: 0.96rem;
  color: var(--color-ink);
}
.form-field textarea { min-height: 120px; resize: vertical; }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: 2px solid var(--color-brand-light);
  outline-offset: 1px;
}
.form-row { display: grid; gap: var(--space-2); grid-template-columns: 1fr; }
@media (min-width: 640px) { .form-row { grid-template-columns: 1fr 1fr; } }
.form-errors { color: var(--color-danger); font-size: 0.82rem; margin-top: 0.3rem; }
.form-card { background: var(--color-white); border-radius: var(--radius-lg); padding: var(--space-4); border: 1px solid var(--color-border); box-shadow: var(--shadow); }
.alert { padding: var(--space-2) var(--space-3); border-radius: var(--radius); margin-bottom: var(--space-3); font-weight: 600; }
.alert-success { background: #e9f3ea; color: var(--color-success); border: 1px solid #bfe0c4; }
.alert-error { background: #f6e9e9; color: var(--color-danger); border: 1px solid #e3bcbc; }

/* ---------- FAQ accordion ---------- */
.faq-item { border-bottom: 1px solid var(--color-border); }
.faq-item summary {
  cursor: pointer;
  padding: var(--space-2) 0;
  font-weight: 700;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-2);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.4rem; color: var(--color-brand); flex-shrink: 0; }
.faq-item[open] summary::after { content: "\2212"; }
.faq-item p { padding-bottom: var(--space-2); }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs { font-size: 0.85rem; color: var(--color-ink-soft); padding-block: var(--space-2); }
.breadcrumbs a { color: var(--color-ink-soft); }
.breadcrumbs a:hover { color: var(--color-brand); }
.breadcrumbs .sep { margin: 0 0.4rem; }

/* ---------- Footer ---------- */
.site-footer { background: var(--color-ink); color: rgba(255, 255, 255, 0.75); padding-block: var(--space-6) var(--space-4); margin-top: var(--space-6); }
.site-footer a { color: rgba(255, 255, 255, 0.75); }
.site-footer a:hover { color: var(--color-white); }
.footer-grid { display: grid; gap: var(--space-4); grid-template-columns: 1fr; margin-bottom: var(--space-4); }
@media (min-width: 768px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.footer-grid h4 { color: var(--color-white); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.06em; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.5rem; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.15); padding-top: var(--space-3); font-size: 0.82rem; display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-2); }

/* ---------- Certification badge (e.g. APC Advantage) ----------
   Displayed on a white card even on the dark footer, per the
   partner's own brand guide: if the badge's colour doesn't match the
   surrounding background, put it on white/black rather than directly
   on a mismatched colour. Fixed height + auto width keeps it
   undistorted; generous padding keeps it out of the "clear space". */
.cert-strip { padding-bottom: var(--space-3); }
.cert-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 0.85rem 1.2rem;
  box-shadow: var(--shadow);
}
.cert-badge__logo { height: 26px; width: auto; }
.cert-badge__text { display: flex; flex-direction: column; line-height: 1.3; }
.cert-badge__text strong { color: var(--color-ink); font-size: 0.85rem; }
.cert-badge__text span { color: var(--color-ink-soft); font-size: 0.78rem; }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.stack { display: flex; flex-direction: column; gap: var(--space-2); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--color-brand);
  color: var(--color-white); padding: 0.6rem 1rem; z-index: 100;
}
.skip-link:focus { left: var(--space-2); top: var(--space-2); }