/* ==========================================================================
   Drainage Southampton — Design System
   Palette: concrete grey / deep slate teal / pipe copper / flow cyan
   Type: Fraunces (display) + IBM Plex Sans (body) + IBM Plex Mono (utility)
   ========================================================================== */

:root {
  --color-bg: #F4F5F3;
  --color-paper: #FFFFFF;
  --color-ink: #0D1B1E;
  --color-navy: #16333A;
  --color-navy-dark: #0F262B;
  --color-copper: #B5622A;
  --color-copper-dark: #954F21;
  --color-flow: #2E8B9E;
  --color-flow-light: #E4EFF0;
  --color-line: #D8DAD5;
  --color-line-dark: #2A464C;
  --color-muted: #55676A;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --radius-sm: 4px;
  --radius-md: 8px;
  --container: 1120px;
  --space-section: clamp(3rem, 6vw, 6rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-flow); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-navy);
  line-height: 1.15;
  margin: 0 0 0.6em;
  font-weight: 600;
}
h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 500; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }
p { margin: 0 0 1em; }
ul, ol { padding-left: 1.2em; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 1.25rem; }
.section { padding: var(--space-section) 0; }
.section--tight { padding: 2.5rem 0; }
.section--navy { background: var(--color-navy); color: #EAF1F1; }
.section--navy h2, .section--navy h3 { color: #FFFFFF; }
.section--navy p { color: #C7D6D7; }
.section--flow { background: var(--color-flow-light); }
.eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  color: var(--color-copper);
  display: inline-block;
  margin-bottom: 0.75rem;
}
.section--navy .eyebrow { color: #E8A87C; }

/* Skip link */
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--color-navy); color: #fff;
  padding: 0.75rem 1.25rem; z-index: 1000;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(244,245,243,0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-line);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem 1.25rem;
  max-width: var(--container); margin: 0 auto;
  gap: 1rem;
}
.brand {
  font-family: var(--font-display);
  font-size: 1.25rem; font-weight: 600;
  color: var(--color-navy);
  white-space: nowrap;
}
.brand span { color: var(--color-copper); }
.main-nav { display: none; }
.main-nav ul { list-style: none; display: flex; gap: 1.75rem; margin: 0; padding: 0; }
.main-nav a {
  color: var(--color-navy); font-weight: 500; font-size: 0.95rem;
}
.main-nav a:hover { text-decoration: none; color: var(--color-copper); }
.header-cta {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--color-copper); color: #fff;
  padding: 0.65rem 1.1rem; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.95rem; white-space: nowrap;
}
.header-cta:hover { background: var(--color-copper-dark); text-decoration: none; color: #fff; }
.nav-toggle {
  display: inline-flex; background: none; border: 1px solid var(--color-line-dark);
  border-radius: var(--radius-sm); padding: 0.5rem 0.7rem; cursor: pointer;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  display: block; width: 20px; height: 2px; background: var(--color-navy); position: relative;
}
.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-line);
  background: var(--color-bg);
}
.mobile-nav.is-open { display: flex; }
.mobile-nav a {
  padding: 0.9rem 1.25rem; border-bottom: 1px solid var(--color-line);
  color: var(--color-navy); font-weight: 500;
}

/* Desktop dropdowns (Services / Coverage) */
.main-nav .has-dropdown { position: relative; }
.main-nav .has-dropdown > a { display: inline-flex; align-items: center; gap: 0.3rem; }
.main-nav a.is-active,
.main-nav .has-dropdown.is-active > a { color: var(--color-copper); }
.chevron { transition: transform 0.15s ease; }
.has-dropdown:hover .chevron, .has-dropdown:focus-within .chevron { transform: rotate(180deg); }
.main-nav .dropdown {
  position: absolute; top: 100%; left: 0; margin-top: 0.4rem;
  min-width: 240px; max-height: 70vh; overflow-y: auto;
  background: var(--color-paper); border: 1px solid var(--color-line);
  border-radius: var(--radius-md); box-shadow: 0 14px 32px rgba(15,38,43,0.14);
  list-style: none; padding: 0.5rem;
  opacity: 0; visibility: hidden; transform: translateY(6px);
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 150;
}
.main-nav .has-dropdown:hover > .dropdown,
.main-nav .has-dropdown:focus-within > .dropdown {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.main-nav .dropdown a {
  display: block; padding: 0.55rem 0.7rem; border-radius: var(--radius-sm);
  font-size: 0.92rem; font-weight: 500; color: var(--color-navy); white-space: nowrap;
}
.main-nav .dropdown a:hover { background: var(--color-flow-light); text-decoration: none; }
.main-nav .dropdown a.is-current { background: var(--color-flow-light); font-weight: 600; }
.main-nav .dropdown .dropdown__divider {
  border-top: 1px solid var(--color-line); margin-top: 0.4rem; padding-top: 0.4rem;
}
.main-nav .dropdown .dropdown__all { font-weight: 600; color: var(--color-copper); }
.main-nav .dropdown .dropdown__all:hover { background: var(--color-flow-light); }

/* Mobile dropdown groups (native <details>, no JS required) */
.mobile-dropdown { border-bottom: 1px solid var(--color-line); }
.mobile-dropdown summary {
  padding: 0.9rem 1.25rem; color: var(--color-navy); font-weight: 500;
  cursor: pointer; list-style: none; display: flex; align-items: center;
  justify-content: space-between;
}
.mobile-dropdown summary::-webkit-details-marker { display: none; }
.mobile-dropdown summary::after { content: "+"; color: var(--color-muted); font-weight: 400; font-size: 1.1rem; }
.mobile-dropdown[open] summary::after { content: "\2013"; }
.mobile-dropdown__list { display: flex; flex-direction: column; background: rgba(0,0,0,0.02); }
.mobile-dropdown__list a {
  padding: 0.7rem 1.25rem 0.7rem 2rem; font-size: 0.92rem;
  color: var(--color-muted); border-top: 1px solid var(--color-line);
}
.mobile-dropdown__list a.is-current { color: var(--color-copper); font-weight: 600; }
.mobile-dropdown__list a.dropdown__all { color: var(--color-copper); font-weight: 600; }
.mobile-nav > a.is-active { color: var(--color-copper); }

@media (min-width: 860px) {
  .main-nav { display: block; }
  .nav-toggle { display: none; }
  .mobile-nav { display: none !important; }
}

/* Sticky mobile call button */
.sticky-call {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
  background: var(--color-copper); color: #fff;
  display: flex; align-items: center; justify-content: center; gap: 0.6rem;
  padding: 0.9rem 1rem; font-weight: 700; font-size: 1rem;
  box-shadow: 0 -2px 10px rgba(0,0,0,0.15);
}
.sticky-call:hover { color: #fff; text-decoration: none; background: var(--color-copper-dark); }
@media (min-width: 860px) { .sticky-call { display: none; } }
body { padding-bottom: 64px; }
@media (min-width: 860px) { body { padding-bottom: 0; } }

/* Hero */
.hero {
  position: relative; overflow: hidden;
  background: var(--color-navy);
  color: #EAF1F1;
  padding: 3.5rem 0 3rem;
}
.hero__flow {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0.35; pointer-events: none;
}
.hero__grid { display: grid; gap: 2rem; position: relative; z-index: 1; }
.hero h1 { color: #fff; }
.hero p.lead { font-size: 1.1rem; color: #C7D6D7; max-width: 46ch; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-top: 1.5rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.8rem 1.4rem; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 1rem; border: 1px solid transparent;
}
.btn--primary { background: var(--color-copper); color: #fff; }
.btn--primary:hover { background: var(--color-copper-dark); color: #fff; text-decoration: none; }
.btn--ghost { border-color: rgba(255,255,255,0.4); color: #fff; }
.btn--ghost:hover { background: rgba(255,255,255,0.1); color: #fff; text-decoration: none; }
.btn--ink { background: var(--color-navy); color: #fff; }
.btn--ink:hover { background: var(--color-navy-dark); color: #fff; text-decoration: none; }

.trust-strip {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem 1.5rem;
  margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.15);
}
.trust-strip__item { display: flex; align-items: center; gap: 0.6rem; font-size: 0.92rem; color: #DCE7E7; }
.trust-strip__item svg { flex-shrink: 0; }
@media (min-width: 700px) { .trust-strip { grid-template-columns: repeat(4, 1fr); } }

/* Bento grid (services) */
.bento {
  display: grid; grid-template-columns: 1fr; gap: 1rem;
}
@media (min-width: 700px) { .bento { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .bento { grid-template-columns: repeat(4, 1fr); } }
.bento-card {
  background: var(--color-paper); border: 1px solid var(--color-line);
  border-radius: var(--radius-md); padding: 1.5rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.bento-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(15,38,43,0.08); }
.bento-card__icon {
  width: 44px; height: 44px; border-radius: var(--radius-sm);
  background: var(--color-flow-light); color: var(--color-flow);
  display: flex; align-items: center; justify-content: center; margin-bottom: 1rem;
}
.bento-card h3 { margin-bottom: 0.4rem; font-size: 1.1rem; }
.bento-card p { color: var(--color-muted); font-size: 0.95rem; margin-bottom: 0.6rem; }
.bento-card a.card-link { font-weight: 600; font-size: 0.9rem; }

/* Timeline (process) */
.timeline { position: relative; margin-top: 2.5rem; }
.timeline::before {
  content: ""; position: absolute; left: 19px; top: 0; bottom: 0; width: 2px;
  background: var(--color-line);
}
@media (min-width: 860px) { .timeline::before { left: 50%; transform: translateX(-1px); } }
.timeline-step {
  position: relative; padding-left: 3.2rem; margin-bottom: 2rem;
}
.timeline-step__num {
  position: absolute; left: 0; top: 0; width: 40px; height: 40px;
  border-radius: 50%; background: var(--color-navy); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 0.95rem; z-index: 1;
}
.timeline-step h3 { margin-bottom: 0.3rem; }
.timeline-step p { color: var(--color-muted); margin: 0; }

/* Two-column FAQ */
.faq-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; margin-top: 2rem; }
@media (min-width: 780px) { .faq-grid { grid-template-columns: repeat(2, 1fr); gap: 1.25rem; } }
.faq-item {
  background: var(--color-paper); border: 1px solid var(--color-line);
  border-radius: var(--radius-md); padding: 1.25rem 1.4rem;
}
.faq-item h3 { font-size: 1.02rem; margin-bottom: 0.4rem; font-family: var(--font-body); font-weight: 600; color: var(--color-ink); }
.faq-item p { color: var(--color-muted); margin: 0; font-size: 0.95rem; }

/* Split CTA band */
.split-cta {
  display: grid; grid-template-columns: 1fr; gap: 1.5rem;
  background: var(--color-navy); color: #fff; border-radius: var(--radius-md);
  padding: 2.25rem; align-items: center;
}
@media (min-width: 780px) { .split-cta { grid-template-columns: 2fr 1fr; } }
.split-cta h2 { color: #fff; margin-bottom: 0.5rem; }
.split-cta p { color: #C7D6D7; margin: 0; }
.split-cta__actions { display: flex; flex-direction: column; gap: 0.75rem; }

/* Pill nav (used on hub pages: services / coverage) */
.pill-nav { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1.5rem 0 0; }
.pill {
  display: inline-block; padding: 0.5rem 1rem; border-radius: 999px;
  background: var(--color-paper); border: 1px solid var(--color-line);
  font-size: 0.9rem; font-weight: 500; color: var(--color-navy);
}
.pill:hover { border-color: var(--color-copper); color: var(--color-copper); text-decoration: none; }

/* Breadcrumbs */
.breadcrumbs { font-size: 0.85rem; color: var(--color-muted); padding: 1rem 0 0; }
.breadcrumbs a { color: var(--color-muted); }
.breadcrumbs a:hover { color: var(--color-flow); }
.breadcrumbs .sep { margin: 0 0.4rem; }

/* Cards grid for areas / services listing pages */
.card-grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; margin-top: 2rem; }
@media (min-width: 700px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }
.info-card {
  background: var(--color-paper); border: 1px solid var(--color-line);
  border-radius: var(--radius-md); padding: 1.5rem;
}
.info-card h3 { margin-bottom: 0.5rem; }
.info-card .postcode-tag {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--color-copper);
  text-transform: uppercase; letter-spacing: 0.05em;
}

/* Content sections */
.prose { max-width: 68ch; }
.prose p { color: var(--color-muted); }
.two-col { display: grid; grid-template-columns: 1fr; gap: 2rem; }
@media (min-width: 860px) { .two-col { grid-template-columns: 1.2fr 0.8fr; } }

/* Contact page */
.contact-details { list-style: none; margin: 0; padding: 0; }
.contact-details li { display: flex; gap: 0.75rem; padding: 0.9rem 0; border-bottom: 1px solid var(--color-line); }
.contact-details strong { display: block; color: var(--color-navy); }

/* Footer */
.site-footer { background: var(--color-navy-dark); color: #B9C8C8; padding: 3rem 0 5.5rem; }
@media (min-width: 860px) { .site-footer { padding-bottom: 3rem; } }
.footer-grid {
  display: grid; grid-template-columns: 1fr; gap: 2rem;
}
@media (min-width: 700px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } }
.site-footer h4 { color: #fff; font-family: var(--font-body); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 1rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 0.5rem; }
.site-footer a { color: #B9C8C8; font-size: 0.92rem; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  max-width: var(--container); margin: 2.5rem auto 0; padding: 1.5rem 1.25rem 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.82rem; color: #7F9494;
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; justify-content: space-between;
}
.footer-bottom a { color: #9FB0B0; }

/* Utility */
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }

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