/* ==========================================================================
   UKAS SLIP TESTING — Design System
   Navy + Orange. Commercial. Industrial. Direct.
   ========================================================================== */

/* --- Design tokens --- */
:root {
  /* Primary palette */
  --nav-900: #0a1929;   /* Deepest navy - body text, dark hero */
  --nav-800: #102a43;   /* Navy - headers, major surfaces */
  --nav-700: #1e3a5f;   /* Medium navy - borders, subtle fills */
  --nav-400: #486581;   /* Mid navy - secondary text on light */
  --nav-100: #d9e2ec;   /* Pale navy - section fills */
  --nav-50:  #f0f4f8;   /* Washed navy - page background alt */

  /* Accent */
  --amber-600: #c2410c; /* Strong orange - CTAs, accents */
  --amber-500: #ea580c; /* Brighter orange - hover */
  --amber-400: #f97316; /* Bright orange - highlights */
  --amber-100: #ffedd5; /* Pale orange - badges */

  /* Neutrals */
  --ink:   #121826;     /* True text */
  --muted: #4b5563;     /* Secondary text */
  --line:  #cbd5e1;     /* Borders */
  --paper: #ffffff;     /* Card/surface */
  --cream: #fafbfc;     /* Subtle background */

  /* Status */
  --green: #16a34a;     /* Success */
  --red:   #dc2626;     /* Warning */

  /* Typography */
  --font-display: 'Archivo Black', 'Impact', 'Arial Black', sans-serif;
  --font-body: 'Inter', -apple-system, 'Segoe UI', 'Helvetica Neue', sans-serif;

  /* Scale */
  --fs-hero: clamp(2.5rem, 6vw, 5rem);
  --fs-h1: clamp(2rem, 4vw, 3.25rem);
  --fs-h2: clamp(1.5rem, 3vw, 2.25rem);
  --fs-h3: 1.4rem;
  --fs-lead: 1.25rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-24: 6rem;

  /* Elements */
  --radius: 2px; /* Sharp corners - industrial feel */
  --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgba(10, 25, 41, 0.06);
  --shadow-md: 0 4px 12px rgba(10, 25, 41, 0.08);
  --shadow-lg: 0 12px 32px rgba(10, 25, 41, 0.12);
}

/* --- Reset + base --- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

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

a {
  color: var(--amber-600);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s;
}
a:hover { color: var(--amber-500); text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 var(--sp-4);
  color: var(--nav-900);
  text-transform: uppercase;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { margin: 0 0 var(--sp-4); }
strong { font-weight: 700; }

ul, ol { padding-left: 1.25rem; margin: 0 0 var(--sp-4); }
li { margin-bottom: var(--sp-2); }

hr { border: 0; height: 2px; background: var(--nav-100); margin: var(--sp-12) 0; }

/* --- Layout --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

.container-narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

section { padding: var(--sp-16) 0; }
section.tight { padding: var(--sp-12) 0; }

/* --- Top bar (phone number banner) --- */
.topbar {
  background: var(--nav-900);
  color: var(--nav-100);
  font-size: var(--fs-small);
  padding: 0.5rem 0;
}

.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.topbar a { color: var(--amber-400); font-weight: 600; }
.topbar a:hover { color: var(--amber-500); }

/* --- Header --- */
.site-header {
  background: var(--paper);
  border-bottom: 4px solid var(--nav-900);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-6);
}

.brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--nav-900);
  line-height: 1;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--nav-900);
}

.brand-mark .amp { color: var(--amber-600); }

.brand-tag {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--nav-400);
  font-weight: 600;
  margin-top: 0.15rem;
}

.primary-nav {
  display: flex;
  gap: var(--sp-6);
  align-items: center;
  flex-wrap: wrap;
}

.primary-nav a {
  color: var(--nav-900);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.primary-nav a:hover {
  color: var(--amber-600);
  text-decoration: none;
}

.primary-nav .btn-nav {
  background: var(--amber-600);
  color: #fff;
  padding: 0.625rem 1.25rem;
}

.primary-nav .btn-nav:hover {
  background: var(--nav-900);
  color: #fff;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none !important;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
  line-height: 1;
}

.btn-primary {
  background: var(--amber-600);
  color: #fff;
  border-color: var(--amber-600);
}
.btn-primary:hover {
  background: var(--amber-500);
  border-color: var(--amber-500);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-dark {
  background: var(--nav-900);
  color: #fff;
  border-color: var(--nav-900);
}
.btn-dark:hover {
  background: var(--nav-800);
  color: var(--amber-400);
}

.btn-ghost {
  background: transparent;
  color: var(--nav-900);
  border-color: var(--nav-900);
}
.btn-ghost:hover {
  background: var(--nav-900);
  color: #fff;
}

.btn-lg {
  padding: 1.125rem 2.25rem;
  font-size: 1.05rem;
}

.btn-group {
  display: flex;
  gap: var(--sp-4);
  flex-wrap: wrap;
  margin-top: var(--sp-6);
}

/* --- Hero --- */
.hero {
  background: var(--nav-900);
  color: #fff;
  padding: var(--sp-24) 0 var(--sp-16);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: -10%;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, transparent 45%, var(--amber-600) 45%, var(--amber-600) 52%, transparent 52%);
  opacity: 0.15;
  z-index: 1;
}

.hero .container { position: relative; z-index: 2; }

.hero h1 {
  color: #fff;
  font-size: var(--fs-hero);
}

.hero h1 .accent {
  color: var(--amber-400);
  display: block;
}

.hero .lead {
  font-size: var(--fs-lead);
  max-width: 720px;
  color: var(--nav-100);
  margin-bottom: var(--sp-8);
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-8);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.08);
  color: var(--nav-100);
  padding: 0.5rem 0.875rem;
  font-size: var(--fs-small);
  font-weight: 600;
  border: 1px solid rgba(255,255,255,0.12);
}

.chip .dot {
  width: 6px;
  height: 6px;
  background: var(--amber-400);
  border-radius: 50%;
}

/* --- Eyebrow label --- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.75rem;
  color: var(--amber-600);
  margin-bottom: var(--sp-3);
}

.eyebrow.on-dark { color: var(--amber-400); }

/* --- Trust strip --- */
.trust-strip {
  background: var(--nav-50);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: var(--sp-6) 0;
}

.trust-strip .container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--sp-6);
  align-items: center;
}

.trust-item {
  text-align: center;
  padding: 0 var(--sp-4);
  border-right: 1px solid var(--line);
}
.trust-item:last-child { border-right: none; }

.trust-num {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--nav-900);
  line-height: 1;
  letter-spacing: -0.02em;
}

.trust-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  font-weight: 600;
  margin-top: 0.25rem;
}

/* --- Sections --- */
.section-alt { background: var(--nav-50); }
.section-dark {
  background: var(--nav-800);
  color: var(--nav-100);
}
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark a { color: var(--amber-400); }

/* --- Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--sp-6);
}

.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
}

.card-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
}

@media (max-width: 900px) {
  .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .card-grid-3, .card-grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--nav-900);
  padding: var(--sp-6);
  transition: all 0.15s;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-left-color: var(--amber-600);
  transform: translateX(2px);
  box-shadow: var(--shadow-md);
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--sp-2);
  color: var(--nav-900);
}

.card p {
  color: var(--muted);
  font-size: 0.95rem;
  flex: 1;
  margin-bottom: var(--sp-4);
}

.card-link {
  color: var(--amber-600);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  margin-top: auto;
}

.card-link::after { content: ' →'; }

/* Compact card for city lists */
.card-compact {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: var(--sp-4);
  text-align: center;
  transition: all 0.15s;
}
.card-compact a {
  color: var(--nav-900);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  display: block;
}
.card-compact:hover {
  background: var(--nav-900);
  border-color: var(--nav-900);
}
.card-compact:hover a { color: var(--amber-400); }

/* --- Big number callout --- */
.number-callout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--sp-6);
  margin: var(--sp-8) 0;
}

.number-callout-item {
  text-align: center;
  padding: var(--sp-6);
  background: var(--paper);
  border-top: 4px solid var(--amber-600);
}

.number-callout-item .num {
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: var(--nav-900);
  line-height: 1;
  margin-bottom: var(--sp-3);
  letter-spacing: -0.03em;
}

.number-callout-item .lbl {
  font-weight: 600;
  font-size: 0.95rem;
}

/* --- UKAS explainer grid --- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-12);
  align-items: start;
}

@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: var(--sp-8); } }

/* --- Compare table --- */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--sp-6) 0;
}

.compare-table th, .compare-table td {
  padding: var(--sp-4);
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.compare-table th {
  background: var(--nav-900);
  color: #fff;
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

.compare-table td.yes { color: var(--green); font-weight: 700; }
.compare-table td.no  { color: var(--red); font-weight: 700; }

/* --- Callout boxes --- */
.callout {
  background: var(--nav-50);
  border-left: 4px solid var(--amber-600);
  padding: var(--sp-4) var(--sp-6);
  margin: var(--sp-6) 0;
}

.callout-dark {
  background: var(--nav-900);
  color: #fff;
  padding: var(--sp-6);
  margin: var(--sp-6) 0;
}

.callout-dark h3 { color: var(--amber-400); }

/* --- Phone CTA banner --- */
.phone-banner {
  background: var(--amber-600);
  color: #fff;
  padding: var(--sp-8) 0;
  text-align: center;
}

.phone-banner h2 {
  color: #fff;
  margin-bottom: var(--sp-2);
}

.phone-banner .phone-number {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  color: #fff;
  text-decoration: none;
  margin: var(--sp-2) 0;
  letter-spacing: -0.02em;
}

.phone-banner .phone-number:hover {
  color: var(--nav-900);
  text-decoration: none;
}

/* --- Breadcrumbs --- */
.crumbs {
  background: var(--nav-50);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-small);
}

.crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
}

.crumbs li { margin: 0; color: var(--muted); }
.crumbs li::after { content: ' /'; margin-left: 0.5rem; color: var(--line); }
.crumbs li:last-child::after { display: none; }
.crumbs li a { color: var(--nav-900); font-weight: 600; }

/* --- FAQ block --- */
.faq-item {
  border: 1px solid var(--line);
  margin-bottom: var(--sp-3);
  background: var(--paper);
}

.faq-item summary {
  cursor: pointer;
  padding: var(--sp-4) var(--sp-6);
  font-weight: 700;
  color: var(--nav-900);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--amber-600);
  transition: transform 0.2s;
}
.faq-item[open] summary::after { content: '−'; }

.faq-item summary:hover { background: var(--nav-50); }

.faq-body {
  padding: 0 var(--sp-6) var(--sp-4);
  color: var(--muted);
}
.faq-body p:last-child { margin-bottom: 0; }

/* --- CTA band --- */
.cta-band {
  background: var(--nav-900);
  color: #fff;
  padding: var(--sp-16) 0;
  text-align: center;
}

.cta-band h2 { color: #fff; max-width: 720px; margin: 0 auto var(--sp-4); }
.cta-band p { color: var(--nav-100); max-width: 640px; margin: 0 auto var(--sp-6); }

/* --- Footer --- */
.site-footer {
  background: var(--nav-900);
  color: var(--nav-100);
  padding: var(--sp-12) 0 var(--sp-6);
  font-size: var(--fs-small);
}

.site-footer a { color: var(--nav-100); }
.site-footer a:hover { color: var(--amber-400); }

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--sp-8);
  margin-bottom: var(--sp-8);
}

@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

.footer-grid h4 {
  color: var(--amber-400);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--sp-4);
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-grid li {
  margin-bottom: var(--sp-2);
}

.footer-bottom {
  border-top: 1px solid var(--nav-700);
  padding-top: var(--sp-6);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
  font-size: 0.8rem;
  color: var(--nav-400);
}

/* --- Utilities --- */
.text-center { text-align: center; }
.mt-8 { margin-top: var(--sp-8); }
.mt-12 { margin-top: var(--sp-12); }
.mb-8 { margin-bottom: var(--sp-8); }
.mb-12 { margin-bottom: var(--sp-12); }

.ukas-badge {
  display: inline-block;
  background: var(--nav-900);
  color: var(--amber-400);
  padding: 0.375rem 0.75rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.prose { max-width: 760px; }
.prose h2 { margin-top: var(--sp-12); }
.prose h3 { margin-top: var(--sp-8); }
.prose ul { margin-bottom: var(--sp-6); }