/* ==========================================================================
   NY PLUMBING — ELTINGVILLE & ANNADALE, STATEN ISLAND
   Design System & Master Stylesheet
   Architecture: Pure Vanilla CSS, Modern Typography, WCAG AA Compliant
   Distinctive Prefix: .elt- (Anti-Footprinting Architecture)
   ========================================================================== */

:root {
  /* Brand Palette - Coastal Deep Navy & Flame Amber */
  --elt-navy-950: #0a192f;
  --elt-navy-900: #0f223f;
  --elt-navy-800: #19355e;
  --elt-navy-700: #234980;
  
  --elt-amber-500: #e87a1e;
  --elt-amber-600: #cf6711;
  --elt-amber-glow: rgba(232, 122, 30, 0.28);
  
  --elt-slate-50: #f7f9fc;
  --elt-slate-100: #eef2f7;
  --elt-slate-200: #dce3ed;
  --elt-slate-300: #c4d0e0;
  --elt-slate-400: #93a5bd;
  --elt-slate-500: #627692;
  --elt-slate-700: #334358;
  --elt-slate-900: #1b2533;
  
  --elt-white: #ffffff;
  --elt-charcoal: #212936;
  --elt-border: #dce3ed;
  
  /* Typography */
  --elt-font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  /* Radii & Shadows */
  --elt-radius-sm: 4px;
  --elt-radius-md: 8px;
  --elt-radius-lg: 12px;
  
  --elt-shadow-sm: 0 1px 3px rgba(10, 25, 47, 0.08);
  --elt-shadow-md: 0 4px 12px rgba(10, 25, 47, 0.10);
  --elt-shadow-lg: 0 10px 25px rgba(10, 25, 47, 0.14);
  
  --elt-container: 1180px;
  --elt-transition: all 0.25s ease-in-out;
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--elt-font-main);
  color: var(--elt-charcoal);
  background-color: var(--elt-white);
  line-height: 1.65;
  padding-bottom: 72px; /* Buffer for mobile sticky call bar */
}

@media (min-width: 992px) {
  body {
    padding-bottom: 0;
  }
}

/* Accessibility: Skip Link */
.elt-skip-link {
  position: absolute;
  top: -50px;
  left: 12px;
  background: var(--elt-amber-500);
  color: var(--elt-navy-950);
  padding: 8px 16px;
  z-index: 9999;
  text-decoration: none;
  font-weight: 700;
  border-radius: var(--elt-radius-sm);
  transition: top 0.2s ease;
}

.elt-skip-link:focus {
  top: 12px;
}

/* Layout Containers */
.elt-container {
  width: 100%;
  max-width: var(--elt-container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.elt-section {
  padding: 56px 0;
}

@media (min-width: 768px) {
  .elt-section {
    padding: 72px 0;
  }
}

.elt-section-alt {
  background-color: var(--elt-slate-50);
}

.elt-section-dark {
  background-color: var(--elt-navy-900);
  color: var(--elt-white);
}

/* Typography Hierarchy */
h1, h2, h3, h4 {
  color: var(--elt-navy-900);
  line-height: 1.25;
  font-weight: 700;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.1rem;
  letter-spacing: -0.025em;
}

h2 {
  font-size: 1.65rem;
  margin-top: 1.75rem;
  letter-spacing: -0.015em;
}

h3 {
  font-size: 1.25rem;
  margin-top: 1.25rem;
}

h4 {
  font-size: 1.05rem;
}

p {
  margin-bottom: 1.25rem;
  color: var(--elt-slate-700);
}

.elt-lead {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--elt-slate-700);
  font-weight: 500;
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--elt-slate-700);
}

li {
  margin-bottom: 0.5rem;
}

a {
  color: var(--elt-navy-800);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--elt-transition);
}

a:hover, a:focus {
  color: var(--elt-amber-600);
}

/* Header & Top Navigation */
.elt-header {
  background-color: var(--elt-navy-950);
  color: var(--elt-white);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
  border-bottom: 2px solid var(--elt-amber-500);
}

.elt-nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 10px 0;
}

.elt-brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--elt-white);
}

.elt-brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--elt-white);
  line-height: 1.1;
}

.elt-brand-sub {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--elt-amber-500);
  font-weight: 600;
}

/* Desktop Navigation Menu */
.elt-nav-menu {
  display: none;
  list-style: none;
  padding: 0;
  margin: 0;
}

.elt-nav-item {
  position: relative;
}

.elt-nav-link {
  color: var(--elt-white);
  text-decoration: none;
  padding: 10px 14px;
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: var(--elt-radius-sm);
  transition: var(--elt-transition);
}

.elt-nav-link:hover, .elt-nav-link:focus, .elt-nav-link.active {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--elt-amber-500);
}

/* Dropdown */
.elt-dropdown-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.elt-dropdown-arrow {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  transition: transform 0.2s ease;
}

.elt-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--elt-navy-900);
  min-width: 280px;
  max-height: 480px;
  overflow-y: auto;
  border-radius: var(--elt-radius-sm);
  box-shadow: var(--elt-shadow-lg);
  list-style: none;
  padding: 8px 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  z-index: 1050;
}

.elt-dropdown-item a {
  display: block;
  padding: 8px 18px;
  color: var(--elt-slate-100);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--elt-transition);
}

.elt-dropdown-item a:hover, .elt-dropdown-item a:focus {
  background-color: var(--elt-navy-800);
  color: var(--elt-amber-500);
  padding-left: 22px;
}

/* Desktop Header CTA Button (Exactly 1 Phone Button) */
.elt-header-cta {
  display: none;
}

.elt-btn-call {
  background-color: var(--elt-amber-500);
  color: var(--elt-navy-950);
  padding: 10px 18px;
  border-radius: var(--elt-radius-sm);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 2px 8px var(--elt-amber-glow);
  transition: var(--elt-transition);
}

.elt-btn-call:hover, .elt-btn-call:focus {
  background-color: var(--elt-amber-600);
  color: var(--elt-white);
  transform: translateY(-1px);
}

.elt-phone-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* Mobile Toggle Hamburger */
.elt-nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--elt-radius-sm);
  padding: 10px;
  cursor: pointer;
  z-index: 1100;
}

.elt-nav-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--elt-white);
  transition: var(--elt-transition);
}

.elt-nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.elt-nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.elt-nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Desktop Navigation Media Queries */
@media (min-width: 992px) {
  h1 { font-size: 2.6rem; }
  h2 { font-size: 1.95rem; }
  
  .elt-nav-toggle {
    display: none;
  }
  
  .elt-nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
  }
  
  .elt-header-cta {
    display: block;
  }
  
  .elt-dropdown:hover .elt-dropdown-menu,
  .elt-dropdown:focus-within .elt-dropdown-menu {
    display: block;
  }
  
  .elt-dropdown:hover .elt-dropdown-arrow {
    transform: rotate(180deg);
  }
}

/* Mobile Navigation Open State */
@media (max-width: 991px) {
  .elt-nav-menu.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--elt-navy-950);
    padding: 16px 20px 24px 20px;
    border-bottom: 3px solid var(--elt-amber-500);
    box-shadow: var(--elt-shadow-lg);
    max-height: 80vh;
    overflow-y: auto;
  }
  
  .elt-nav-item {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  
  .elt-nav-link {
    width: 100%;
    padding: 14px 8px;
    font-size: 1.05rem;
    justify-content: space-between;
  }
  
  .elt-dropdown-menu {
    position: static;
    box-shadow: none;
    background-color: rgba(0, 0, 0, 0.25);
    border: none;
    padding-left: 14px;
    margin-bottom: 10px;
  }
  
  .elt-dropdown-menu.is-open {
    display: block;
  }
}

/* Breadcrumb Navigation */
.elt-breadcrumb-wrapper {
  background-color: var(--elt-slate-100);
  padding: 12px 0;
  border-bottom: 1px solid var(--elt-slate-200);
  font-size: 0.88rem;
}

.elt-breadcrumbs {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0;
}

.elt-breadcrumb-item + .elt-breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--elt-slate-400);
}

.elt-breadcrumb-item a {
  color: var(--elt-slate-500);
  text-decoration: none;
}

.elt-breadcrumb-item a:hover {
  text-decoration: underline;
  color: var(--elt-navy-900);
}

.elt-breadcrumb-item[aria-current="page"] {
  color: var(--elt-navy-900);
  font-weight: 600;
}

/* Hero Section */
.elt-hero {
  background: linear-gradient(135deg, var(--elt-navy-950) 0%, var(--elt-navy-900) 65%, var(--elt-navy-800) 100%);
  color: var(--elt-white);
  padding: 64px 0;
  position: relative;
  overflow: hidden;
}

.elt-hero h1 {
  color: var(--elt-white);
  margin-bottom: 1.25rem;
}

.elt-hero-lead {
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--elt-slate-200);
  max-width: 760px;
  margin-bottom: 2rem;
}

.elt-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

@media (min-width: 992px) {
  .elt-hero {
    padding: 80px 0;
  }
  .elt-hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.elt-hero-image-wrap {
  border-radius: var(--elt-radius-md);
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
  border: 2px solid rgba(255, 255, 255, 0.15);
  background-color: var(--elt-navy-900);
}

.elt-hero-image-wrap img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* Call to Action Elements */
.elt-btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--elt-amber-500);
  color: var(--elt-navy-950);
  font-weight: 700;
  font-size: 1.1rem;
  padding: 14px 26px;
  border-radius: var(--elt-radius-sm);
  text-decoration: none;
  box-shadow: 0 4px 14px var(--elt-amber-glow);
  transition: var(--elt-transition);
}

.elt-btn-primary:hover, .elt-btn-primary:focus {
  background-color: var(--elt-amber-600);
  color: var(--elt-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--elt-amber-glow);
}

.elt-cta-banner {
  background: linear-gradient(135deg, var(--elt-navy-900) 0%, var(--elt-navy-800) 100%);
  color: var(--elt-white);
  padding: 36px;
  border-radius: var(--elt-radius-md);
  margin: 40px 0;
  border-left: 6px solid var(--elt-amber-500);
}

.elt-cta-banner h3 {
  color: var(--elt-white);
  font-size: 1.5rem;
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.elt-cta-banner p {
  color: var(--elt-slate-200);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
  max-width: 680px;
}

/* Content Blocks & Grids */
.elt-grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin: 32px 0;
}

.elt-grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin: 32px 0;
}

@media (min-width: 768px) {
  .elt-grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .elt-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .elt-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.elt-card {
  background: var(--elt-white);
  border: 1px solid var(--elt-border);
  border-radius: var(--elt-radius-md);
  padding: 24px;
  box-shadow: var(--elt-shadow-sm);
  transition: var(--elt-transition);
}

.elt-card:hover {
  box-shadow: var(--elt-shadow-md);
  border-color: var(--elt-slate-300);
}

.elt-card h3 {
  margin-top: 0;
  color: var(--elt-navy-900);
  font-size: 1.25rem;
}

.elt-page-image-card {
  border-radius: var(--elt-radius-md);
  overflow: hidden;
  margin: 32px 0;
  border: 1px solid var(--elt-border);
  box-shadow: var(--elt-shadow-sm);
  background-color: var(--elt-slate-50);
}

.elt-page-image-card img {
  width: 100%;
  height: auto;
  max-height: 480px;
  display: block;
  object-fit: cover;
}

.elt-page-image-caption {
  padding: 12px 18px;
  font-size: 0.88rem;
  color: var(--elt-slate-500);
  font-style: italic;
  background-color: var(--elt-slate-50);
  border-top: 1px solid var(--elt-slate-200);
}

/* Lists & Badges */
.elt-features-list {
  list-style: none;
  padding: 0;
  margin: 24px 0;
}

.elt-features-list li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 14px;
  color: var(--elt-slate-700);
}

.elt-features-list li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  width: 12px;
  height: 6px;
  border-left: 2.5px solid var(--elt-amber-500);
  border-bottom: 2.5px solid var(--elt-amber-500);
  transform: rotate(-45deg);
}

/* FAQ Accordion Details */
.elt-faq-section {
  margin: 48px 0;
}

.elt-faq-item {
  border: 1px solid var(--elt-border);
  border-radius: var(--elt-radius-sm);
  margin-bottom: 12px;
  background: var(--elt-white);
  transition: var(--elt-transition);
}

.elt-faq-summary {
  padding: 16px 20px;
  font-weight: 700;
  color: var(--elt-navy-900);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.05rem;
}

.elt-faq-summary::-webkit-details-marker {
  display: none;
}

.elt-faq-summary::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--elt-amber-500);
  transition: transform 0.2s ease;
}

.elt-faq-item[open] .elt-faq-summary::after {
  transform: rotate(45deg);
}

.elt-faq-item[open] {
  border-color: var(--elt-slate-300);
  box-shadow: var(--elt-shadow-sm);
}

.elt-faq-content {
  padding: 0 20px 18px 20px;
  color: var(--elt-slate-700);
  border-top: 1px solid var(--elt-slate-100);
  padding-top: 14px;
}

/* Callout & Safety Warning Boxes */
.elt-warning-box {
  background: #fff8f5;
  border: 1px solid #fed7aa;
  border-left: 5px solid #ea580c;
  padding: 24px;
  border-radius: var(--elt-radius-sm);
  margin: 32px 0;
}

.elt-warning-box h3 {
  color: #9a3412;
  margin-top: 0;
  font-size: 1.25rem;
}

.elt-warning-box p {
  color: #7c2d12;
  margin-bottom: 10px;
}

.elt-warning-box p:last-child {
  margin-bottom: 0;
}

/* Footer Section (Dark, Contrasting, Accessible) */
.elt-footer {
  background-color: var(--elt-navy-950);
  color: var(--elt-slate-200);
  padding: 56px 0 32px 0;
  border-top: 3px solid var(--elt-amber-500);
  font-size: 0.92rem;
}

.elt-footer h4 {
  color: var(--elt-white);
  font-size: 1.15rem;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.elt-footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 40px;
}

@media (min-width: 600px) {
  .elt-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .elt-footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  }
}

.elt-footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.elt-footer-links li {
  margin-bottom: 8px;
}

.elt-footer-links a {
  color: var(--elt-slate-300);
  text-decoration: none;
  transition: var(--elt-transition);
}

.elt-footer-links a:hover, .elt-footer-links a:focus {
  color: var(--elt-amber-500);
  padding-left: 4px;
}

.elt-footer p {
  color: var(--elt-slate-300);
  line-height: 1.6;
}

.elt-footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  font-size: 0.85rem;
  color: var(--elt-slate-400);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (min-width: 768px) {
  .elt-footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.elt-network-attribution a {
  color: var(--elt-amber-500);
  font-weight: 600;
  text-decoration: underline;
}

/* Mobile Sticky Call Bar (Small screens only, 44x44 target) */
.elt-mobile-bar {
  display: block;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--elt-navy-950);
  padding: 10px 16px;
  z-index: 999;
  box-shadow: 0 -3px 12px rgba(0, 0, 0, 0.35);
  border-top: 2px solid var(--elt-amber-500);
}

@media (min-width: 992px) {
  .elt-mobile-bar {
    display: none;
  }
}

.elt-mobile-bar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background-color: var(--elt-amber-500);
  color: var(--elt-navy-950);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 12px;
  min-height: 48px;
  border-radius: var(--elt-radius-sm);
  text-align: center;
  box-shadow: 0 2px 8px var(--elt-amber-glow);
}

.elt-mobile-bar-btn:active {
  background-color: var(--elt-amber-600);
  color: var(--elt-white);
}