/* =========================================================
   PTG SOLAR — STYLESHEET
   Organized by section. Edit colors/fonts in :root first —
   everything else references these variables.
========================================================= */

/* ---------- 1. DESIGN TOKENS ---------- */
/* Palette and gradient pulled directly from the PTG Solar brand mark:
   near-black navy background, warm gold sun gradient, thin gold frame line. */
:root {
  /* Colors */
  --ink: #060F1C;              /* brand navy - matches logo card background */
  --ink-soft: #101E30;         /* lighter navy for cards/panels on dark bg */
  --ink-softer: #172A40;       /* lighter still, for hover states on dark bg */
  --slate: #55666F;            /* body copy on light background */
  --slate-light: #8A97A0;      /* muted secondary text on light background */
  --paper: #F9F7F2;            /* main page background (light sections) */
  --paper-dim: #F0EBE0;        /* secondary background / stripes */
  --line: #E1DBCC;             /* hairline borders/dividers on light bg */
  --gold-line: rgba(245,185,60,0.35); /* thin gold frame line on dark bg */
  --amber: #F5B93C;            /* brand gold - CTAs, highlights */
  --amber-light: #FFD873;      /* bright top-tone of the sun gradient */
  --amber-dark: #D98A1E;       /* deeper gold/orange, hover state */
  --gradient-gold: linear-gradient(135deg, var(--amber-light) 0%, var(--amber) 55%, var(--amber-dark) 100%);
  --success: #4C7A5E;          /* checkmarks, confirmations */
  --white: #FFFFFF;

  /* Type */
  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;

  /* Layout */
  --max-width: 1180px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --gap: 24px;

  /* Elevation - soft, navy-tinted shadows instead of default gray */
  --shadow-sm: 0 1px 2px rgba(6,15,28,0.06), 0 1px 3px rgba(6,15,28,0.08);
  --shadow-md: 0 4px 12px rgba(6,15,28,0.08), 0 2px 4px rgba(6,15,28,0.06);
  --shadow-lg: 0 16px 40px rgba(6,15,28,0.16), 0 4px 12px rgba(6,15,28,0.08);
  --shadow-gold: 0 8px 28px rgba(245,185,60,0.25);

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 2. RESET & BASE ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.3rem, 4.6vw, 3.6rem); font-weight: 700; }
h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); }
h3 { font-size: 1.25rem; }

p { color: var(--slate); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 100px 0; }

/* Eyebrow / mono label used above headings - reflects spec-sheet identity */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-dark);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 16px;
  height: 1px;
  background: var(--amber-dark);
  display: inline-block;
}

/* Scroll-reveal: sections/cards fade and rise into place. JS toggles .is-visible */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* Visible keyboard focus for accessibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 3. BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
              border-color 0.2s var(--ease), transform 0.2s var(--ease),
              box-shadow 0.2s var(--ease);
}

.btn-primary {
  background: var(--gradient-gold);
  color: var(--ink);
  box-shadow: var(--shadow-gold);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(245,185,60,0.35); }
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}
.btn-outline:hover { background: var(--ink); color: var(--white); transform: translateY(-2px); }

.btn-outline-light {
  background: transparent;
  border-color: rgba(255,255,255,0.35);
  color: var(--white);
}
.btn-outline-light:hover { background: rgba(255,255,255,0.1); border-color: var(--white); transform: translateY(-2px); }

/* ---------- 4. HEADER / NAV ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(249,247,242,0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  border-top: 2px solid var(--amber);
  transition: box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  width: 40px;
  height: 40px;
  object-fit: contain;
  filter: drop-shadow(0 2px 6px rgba(245,185,60,0.35));
  transition: transform 0.3s var(--ease);
}
.logo:hover .logo-mark { transform: rotate(-6deg) scale(1.05); }

.logo-text-group { display: flex; flex-direction: column; line-height: 1.15; }

.logo-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}
.logo-accent { color: var(--amber-dark); }

.logo-tagline {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate-light);
  font-weight: 500;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  position: relative;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
  padding: 6px 0;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--amber);
  transition: width 0.25s var(--ease);
}
.nav-links a:hover::after { width: 100%; }
.nav-links a[aria-current="page"] { color: var(--amber-dark); }
.nav-links a[aria-current="page"]::after { width: 100%; }

.nav-cta { display: flex; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

/* ---------- 5. HERO ---------- */
.hero {
  background: var(--ink);
  color: var(--white);
  padding: 108px 0 0 0;
  position: relative;
  overflow: hidden;
}

/* faint blueprint grid texture behind hero copy - ties to technical/engineering identity */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245,185,60,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245,185,60,0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 60% at 30% 20%, black 40%, transparent 100%);
}

/* radial gold glow + oversized watermark logo, echoing the brand card's vignette */
.hero::after {
  content: "";
  position: absolute;
  top: -10%;
  right: -12%;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle, rgba(245,185,60,0.20) 0%, rgba(245,185,60,0.05) 45%, transparent 70%);
  pointer-events: none;
}

.hero-watermark {
  position: absolute;
  top: 50%;
  right: -6%;
  width: 560px;
  height: 560px;
  transform: translateY(-50%);
  opacity: 0.14;
  pointer-events: none;
  filter: drop-shadow(0 0 60px rgba(245,185,60,0.25));
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding-bottom: 64px;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 18px;
  display: block;
}

.hero h1 { color: var(--white); margin-bottom: 22px; }

.hero-lede {
  color: rgba(255,255,255,0.78);
  font-size: 1.1rem;
  max-width: 46ch;
  margin-bottom: 34px;
}

.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Shared interior-page hero ----------
   A shorter banner for non-homepage pages (About, Services, FAQ,
   Contact...) that keeps the same engineering-blueprint identity as
   the homepage hero without repeating its full height or CTA row. */
.page-hero {
  background: var(--ink);
  color: var(--white);
  padding: 64px 0 48px;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245,185,60,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245,185,60,0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 60% at 30% 20%, black 40%, transparent 100%);
}
.page-hero::after {
  content: "";
  position: absolute;
  right: -80px; top: -100px;
  width: 320px; height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245,185,60,0.30), transparent 70%);
  pointer-events: none;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { color: var(--white); font-size: clamp(28px, 4vw, 38px); max-width: 640px; }
.page-hero p.lede { color: #B8C1CA; max-width: 560px; margin-top: 12px; font-size: 15.5px; }

/* ---------- Mission & Vision cards ----------
   Used on the About page. Mission sits on a light card (what we do,
   grounded/practical); Vision sits on a dark card (where we're
   headed, aspirational) — same contrast logic as the hero/paper
   split used throughout the rest of the site. */
.mv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.mv-card {
  border-radius: var(--radius-lg);
  padding: 40px 36px;
}
.mv-card.mission { background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow-md); }
.mv-card.vision { background: var(--ink); color: var(--white); box-shadow: var(--shadow-lg); position: relative; overflow: hidden; }
.mv-card.vision::after {
  content: "";
  position: absolute; right: -60px; bottom: -60px;
  width: 220px; height: 220px; border-radius: 50%;
  background: radial-gradient(circle, rgba(245,185,60,0.18), transparent 70%);
  pointer-events: none;
}
.mv-card .mv-label {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--amber-dark); margin-bottom: 16px; display: block;
}
.mv-card.vision .mv-label { color: var(--amber); }
.mv-card h3 { font-size: 22px; margin-bottom: 14px; position: relative; z-index: 1; }
.mv-card.vision h3 { color: var(--white); }
.mv-card p { font-size: 15px; line-height: 1.75; position: relative; z-index: 1; }
.mv-card.vision p { color: rgba(255,255,255,0.82); }
@media (max-width: 760px) {
  .mv-grid { grid-template-columns: 1fr; }
}

/* Signature element: system spec panel, styled like an equipment rating label */
.spec-panel {
  position: relative;
  background: linear-gradient(180deg, var(--ink-soft) 0%, var(--ink-softer) 100%);
  border: 1px solid rgba(245,185,60,0.35);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-lg);
}

.spec-panel-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  border-bottom: 1px dashed rgba(245,185,60,0.35);
  padding-bottom: 14px;
  margin-bottom: 16px;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  font-size: 0.92rem;
}
.spec-row:last-child { border-bottom: none; }

.spec-label { color: rgba(255,255,255,0.65); }
.spec-value {
  font-family: var(--font-mono);
  color: var(--white);
  text-align: right;
}

/* Quick-facts strip below hero */
.facts-strip {
  background: var(--ink-soft);
  border-top: 1px solid rgba(255,255,255,0.1);
  position: relative;
}

.facts-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.fact {
  padding: 24px 24px;
  border-left: 1px solid rgba(255,255,255,0.1);
  text-align: left;
  transition: background 0.2s var(--ease);
}
.fact:first-child { border-left: none; }
.fact:hover { background: rgba(245,185,60,0.05); }

.fact-num {
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: 1rem;
  display: block;
  margin-bottom: 4px;
}

.fact-label {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
}

/* ---------- 6. ABOUT PREVIEW ---------- */
.about-preview {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}

.about-preview .credentials {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 24px;
}

.credential-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 0.95rem;
  color: var(--slate);
}

.credential-item .mark {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(76,122,94,0.12);
  color: var(--success);
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- 7. SERVICES ---------- */
.section-head {
  max-width: 640px;
  margin-bottom: 52px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.service-card:hover {
  border-color: var(--amber);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.service-index {
  font-family: var(--font-mono);
  color: var(--amber-dark);
  font-size: 0.85rem;
  margin-bottom: 14px;
  display: block;
}

.service-card h3 { margin-bottom: 10px; }
.service-card p { font-size: 0.94rem; margin-bottom: 18px; }

.service-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid var(--amber);
  padding-bottom: 1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.service-link:hover { color: var(--amber-dark); }

.services-more {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px dashed var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.services-more span { font-size: 13.5px; color: var(--slate); max-width: 640px; }
@media (max-width: 640px) {
  .services-more { flex-direction: column; align-items: flex-start; }
}

/* ---------- 8. INVERTER BRANDS ---------- */
.brands-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.brand-tier {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.brand-tier:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.tier-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.tier-label.tier-1 {
  background: rgba(245,185,60,0.15);
  color: var(--amber-dark);
}

.tier-label.tier-2 {
  background: var(--paper-dim);
  color: var(--slate);
  border: 1px solid var(--line);
}

.brand-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.brand-list li {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.brand-list li:last-child { border-bottom: none; padding-bottom: 0; }

.tier-note {
  font-size: 0.88rem;
  color: var(--slate);
}

/* ---------- 9. PRODUCTS ---------- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.product-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}
.product-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--amber); }

.product-index {
  font-family: var(--font-mono);
  color: var(--amber-dark);
  font-size: 0.8rem;
  display: block;
  margin-bottom: 12px;
}

.product-item h3 { font-size: 1rem; margin-bottom: 8px; }
.product-item p { font-size: 0.85rem; }

/* ---------- 10. CALCULATOR TEASERS ---------- */
.calc-teaser {
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 44px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: center;
}

.calc-teaser + .calc-teaser { margin-top: 24px; }

.calc-copy h3 { margin-bottom: 12px; font-size: 1.4rem; }
.calc-copy p { margin-bottom: 20px; }

.calc-inputs-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 26px;
}

.calc-inputs-list li {
  font-size: 0.88rem;
  color: var(--slate);
  padding-left: 18px;
  position: relative;
}
.calc-inputs-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--amber-dark);
}

/* Placeholder box where the real calculator tool will be embedded later */
.calc-placeholder {
  background: var(--white);
  border: 1px dashed var(--line);
  border-radius: var(--radius-md);
  min-height: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 24px;
  text-align: center;
  transition: border-color 0.25s var(--ease);
}
.calc-placeholder:hover { border-color: var(--amber); }

.calc-placeholder .tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber-dark);
  background: rgba(245,185,60,0.12);
  padding: 5px 12px;
  border-radius: 999px;
}

.calc-placeholder p { font-size: 0.88rem; }

/* ---------- 11. PROCESS / HOW IT WORKS (not used on homepage; kept for reuse on other pages) ---------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.process-step {
  border-top: 3px solid var(--amber);
  padding-top: 18px;
}

.process-step .step-num {
  font-family: var(--font-mono);
  color: var(--amber-dark);
  font-size: 0.85rem;
  display: block;
  margin-bottom: 10px;
}

.process-step h3 { font-size: 1.05rem; margin-bottom: 8px; }
.process-step p { font-size: 0.9rem; }

/* ---------- 12. FAQ PREVIEW ---------- */
.faq-list {
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 22px 4px;
  transition: background 0.2s var(--ease);
  border-radius: var(--radius-sm);
}
.faq-item:hover { background: rgba(245,185,60,0.04); }

.faq-item h3 { font-size: 1.02rem; margin-bottom: 8px; }
.faq-item p { font-size: 0.94rem; }

/* ---------- 12b. FAQ ACCORDION (full FAQ page) ----------
   Native <details>/<summary> — no JS needed, works with
   assistive tech out of the box. Distinct from .faq-item
   above (the homepage preview), which stays a static list. */
.faq-category-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber-dark);
  margin: 48px 0 16px;
}
.faq-category-label:first-child { margin-top: 0; }

.faq-accordion { display: flex; flex-direction: column; gap: 12px; }

.faq-accordion details {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
  overflow: hidden;
}
.faq-accordion details[open] { border-color: var(--amber); box-shadow: var(--shadow-sm); }

.faq-accordion summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.faq-accordion summary::-webkit-details-marker { display: none; }
.faq-accordion summary h3 { font-size: 15.5px; margin: 0; font-weight: 600; }
.faq-accordion summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--amber-dark);
  font-size: 20px;
  line-height: 1;
  flex-shrink: 0;
  transition: transform 0.2s var(--ease);
}
.faq-accordion details[open] summary::after { transform: rotate(45deg); }

.faq-accordion .faq-answer { padding: 0 22px 20px; }
.faq-accordion .faq-answer p { margin: 0; font-size: 14.5px; color: var(--slate); line-height: 1.7; }

@media (max-width: 640px) {
  .faq-accordion summary h3 { font-size: 14.5px; }
}

/* ---------- 12c. CONTACT CARDS ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
@media (max-width: 640px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.contact-card:hover { border-color: var(--amber); transform: translateY(-4px); box-shadow: var(--shadow-md); }
.contact-card .contact-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber-dark);
}
.contact-card .contact-value { font-size: 17px; font-weight: 600; color: var(--ink); word-break: break-word; }
.contact-card .contact-sub { font-size: 13px; color: var(--slate); margin-bottom: 6px; }
.contact-card .btn { align-self: flex-start; margin-top: 10px; }

/* ---------- 13. FINAL CTA BANNER ---------- */
.cta-banner {
  background: var(--ink);
  color: var(--white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(245,185,60,0.14) 0%, transparent 65%);
  pointer-events: none;
}

.cta-banner .container { position: relative; }

.cta-banner h2 { color: var(--white); margin-bottom: 14px; }
.cta-banner p {
  color: rgba(255,255,255,0.75);
  max-width: 52ch;
  margin: 0 auto 32px auto;
}

.cta-banner .hero-ctas { justify-content: center; }

/* ---------- 14. FOOTER ---------- */
.site-footer {
  background: var(--ink-soft);
  color: rgba(255,255,255,0.85);
  padding: 68px 0 24px 0;
  border-top: 2px solid var(--amber);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.footer-col h4 {
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.footer-col p, .footer-col a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  display: block;
  margin-bottom: 10px;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.footer-col a:hover { color: var(--amber); transform: translateX(3px); }

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--white);
  margin-bottom: 14px;
}

.footer-logo-mark {
  width: 40px;
  height: 40px;
  object-fit: contain;
  filter: drop-shadow(0 2px 6px rgba(245,185,60,0.3));
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--amber);
  margin-top: 2px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 15. RESPONSIVE ---------- */
@media (max-width: 960px) {
  .about-preview { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .brands-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .calc-teaser { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .hero-inner { grid-template-columns: 1fr; }
  .facts-row { grid-template-columns: repeat(2, 1fr); }
  .fact:nth-child(3) { border-left: none; }
  .hero-watermark { width: 380px; height: 380px; opacity: 0.1; }
  section { padding: 72px 0; }
}

@media (max-width: 720px) {
  .nav-row { flex-wrap: wrap; }
  .nav-links, .nav-cta { display: none; }
  .nav-toggle {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
  }

  /* Mobile menu: nav links + CTA flow in normal document order below
     the logo/toggle row (via flex-wrap on .nav-row), instead of being
     independently absolutely-positioned. This means the CTA button
     can never overlap the link list, no matter how many links there
     are or how tall they render on a given device/font size. */
  .site-header.open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    order: 3;
    border-top: 1px solid var(--line);
    margin-top: 14px;
    padding: 10px 0 6px;
  }
  .site-header.open .nav-links a {
    width: 100%;
    padding: 13px 4px;
    font-size: 1rem;
  }
  .site-header.open .nav-cta {
    display: flex;
    width: 100%;
    order: 4;
    padding-bottom: 18px;
  }
  .site-header.open .nav-cta .btn { width: 100%; justify-content: center; }

  section { padding: 56px 0; }
  .services-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .hero-watermark { display: none; }
}

/* ---------- 16. SMALL PHONES ---------- */
@media (max-width: 480px) {
  .container { padding: 0 18px; }
  section { padding: 44px 0; }

  /* Stack the 4-up trust strip to 1 column — 2-up reads as cramped
     once labels wrap to 3+ lines on narrow phones. */
  .facts-row { grid-template-columns: 1fr; }
  .fact { border-left: none !important; border-top: 1px solid rgba(255,255,255,0.1); padding: 18px 4px; }
  .fact:first-child { border-top: none; }

  .mv-card { padding: 28px 22px; }
  .service-card, .contact-card, .brand-tier { padding: 24px 20px; }
  .product-item { padding: 18px; }
  .calc-teaser { padding: 26px 20px; }
  .spec-panel { padding: 22px; }

  h1 { font-size: clamp(1.9rem, 8vw, 2.3rem); }
  .page-hero h1 { font-size: clamp(24px, 7.5vw, 30px); }
}

/* Prevent any single element from forcing horizontal scroll on narrow
   viewports (defensive; the layout itself shouldn't rely on this). */
html, body { overflow-x: hidden; }