/* ==========================================================================
   SWIMMING POOL CONSTRUCTION COST CALCULATOR - MAIN STYLESHEET
   SaaS Design: White/Light-gray backgrounds, Blue Accents, Clean Shadows
   ========================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Inter+Tight:wght@300;400;500;600;700&display=swap');

/* --- Design Tokens & Variables --- */
:root {
  /* Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  
  --color-text-primary: #000000;
  --color-text-secondary: #000000;
  --color-text-muted: #000000;
  --color-text-light: #ffffff;

  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #eff6ff;
  
  --color-success: #0daf49;
  --color-success-light: #f0fdf4;
  --color-warning: #ea580c;
  --color-warning-light: #fff7ed;
  --color-danger: #dc2626;
  --color-danger-light: #fef2f2;
  
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;

  --font-family: 'Inter Tight', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-headings: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;

  /* Layout Constants */
  --container-max-width: 1200px;
  --header-height: 72px;
  --border-radius: 12px;
  --border-radius-sm: 6px;
}

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* --- Accessibility Focus Indicators --- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* --- Typography Helpers --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-headings);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.125rem; }

p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

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

/* --- Layout Elements --- */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.section {
  padding: 4rem 0;
}

.section-bg-white {
  background-color: var(--color-bg-primary);
}

.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 3rem auto;
}

.section-header h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.1rem;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-family);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-light);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-text-light);
}

.btn-secondary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-light);
}

.btn-secondary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-text-light);
}

.btn-success {
  background-color: var(--color-success);
  color: var(--color-text-light);
}

.btn-success:hover {
  background-color: #11813a;
  color: var(--color-text-light);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-full {
  width: 100%;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* --- Navigation Header --- */
.header-nav {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.logo img {
  height: 40px;
  width: auto;
  object-fit: contain;
  display: block;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  align-items: center;
}

.nav-item > a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.925rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--border-radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}

.nav-item > a:hover,
.nav-item > a.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* --- Dropdown System --- */
.has-dropdown {
  position: relative;
}

.dropdown-arrow {
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.has-dropdown:hover .dropdown-arrow,
.has-dropdown.open .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 200;
}

.has-dropdown:hover > .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li a {
  display: block;
  padding: 0.6rem 1rem;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.dropdown-menu li a:hover,
.dropdown-menu li a.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  margin: 5px 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* --- Hero Section --- */
.hero {
  background-color: var(--color-bg-primary);
  padding: 5rem 0 4rem 0;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-content h1 {
  font-size: 2.75rem;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero-content p {
  font-size: 1.15rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.hero-graphic {
  background-color: var(--color-primary-light);
  border-radius: var(--border-radius);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 320px;
  border: 1px solid rgba(37, 99, 235, 0.1);
}

.graphic-item {
  background-color: var(--color-bg-primary);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.graphic-item:last-child {
  margin-bottom: 0;
}

.graphic-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.graphic-val {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 1.15rem;
}

/* --- Breadcrumbs --- */
.breadcrumb-container {
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 0;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.85rem;
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--color-text-muted);
}

.breadcrumbs a {
  color: var(--color-text-secondary);
}

.breadcrumbs a:hover {
  color: var(--color-primary);
}

.breadcrumbs li.current {
  color: var(--color-text-muted);
  pointer-events: none;
}

/* --- Cards Grid & Features --- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.card {
  background-color: var(--color-bg-primary);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.card-icon {
  width: 48px;
  height: 48px;
  background-color: var(--color-primary-light);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.card h3 {
  margin-bottom: 0.75rem;
}

/* --- Main Calculator Layout --- */
.calculator-layout {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 2rem;
  align-items: start;
}

.calc-panel {
  background-color: var(--color-bg-primary);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  padding: 2rem;
}

.calc-title-header {
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group.full-width {
  grid-column: span 2;
}

label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

input[type="number"],
input[type="text"],
select {
  font-family: var(--font-family);
  font-size: 0.95rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  width: 100%;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="number"]:hover,
input[type="text"]:hover,
select:hover {
  border-color: var(--color-border-hover);
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  accent-color: var(--color-primary);
}

.radio-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
}

.radio-label input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
}

/* --- Results Panel --- */
.results-panel {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  position: sticky;
  top: 90px;
}

.results-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}

.results-grand-total {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.total-unit-subtitle {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
}

.results-table tr {
  border-bottom: 1px solid var(--color-border);
}

.results-table tr:last-child {
  border-bottom: none;
}

.results-table th,
.results-table td {
  padding: 0.75rem 0;
  font-size: 0.9rem;
}

.results-table th {
  text-align: left;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.results-table td {
  text-align: right;
  font-weight: 700;
  color: var(--color-text-primary);
}

.unit-conversions {
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius-sm);
  padding: 1rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.unit-val {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.unit-val strong {
  color: var(--color-text-primary);
  font-size: 1rem;
}

/* --- FAQ Accordions --- */
.faq-search-wrapper {
  margin-bottom: 2.5rem;
  display: flex;
  gap: 1rem;
}

.search-input-container {
  flex-grow: 1;
  position: relative;
}

.search-input-container svg {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  width: 20px;
  height: 20px;
}

.search-input-container input {
  padding-left: 3rem;
  height: 100%;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-border-hover);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-question svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-normal);
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) ease-out;
}

.faq-answer-inner {
  padding: 0 1.5rem 1.5rem 1.5rem;
  color: var(--color-text-secondary);
  border-top: 1px solid transparent;
  font-size: 0.95rem;
}

.faq-item.active .faq-answer-inner {
  border-top-color: var(--color-border);
}

/* --- About & Contact Forms --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-card-icon {
  width: 40px;
  height: 40px;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* --- Call To Action (CTA) --- */
.cta-section {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  text-align: center;
  padding: 5rem 0;
}

.cta-section h2 {
  color: var(--color-text-light);
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto 2rem auto;
}

.cta-section .btn-secondary {
  border-color: transparent;
}

/* --- Footer --- */
footer {
  background-color: var(--color-bg-primary);
  border-top: 1px solid var(--color-border);
  padding: 4rem 0 2rem 0;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col ul a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-col ul a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --- Back To Top --- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background-color: var(--color-primary);
  color: var(--color-text-light);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal), background-color var(--transition-fast);
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--color-primary-hover);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* --- Chart Containers --- */
.chart-container {
  margin: 1.5rem 0;
  padding: 1.25rem;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  text-align: center;
}

.chart-container h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.chart-container canvas {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto !important;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem 1.25rem;
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.chart-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.chart-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* --- Notification System --- */
.notification {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  background-color: var(--color-text-primary);
  color: var(--color-text-light);
  padding: 1rem 1.5rem;
  border-radius: var(--border-radius-sm);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 1000;
  transform: translateY(150%);
  transition: transform var(--transition-normal);
}

.notification.active {
  transform: translateY(0);
}

.notification-success {
  background-color: var(--color-success);
}

/* --- 404 Layout --- */
.error-page-wrapper {
  text-align: center;
  padding: 6rem 0;
  max-width: 550px;
  margin: 0 auto;
}

.error-code {
  font-size: 7rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

/* --- Responsive Utilities --- */
@media (max-width: 992px) {
  .calculator-layout {
    grid-template-columns: 1fr;
  }
  
  .results-panel {
    position: static;
  }
  
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-content h1 {
    font-size: 2.25rem;
  }
  
  .hero-content .btn-group {
    justify-content: center;
  }
  
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-bg-primary);
    flex-direction: column;
    align-items: stretch;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    transition: left var(--transition-normal);
    z-index: 99;
    overflow-y: auto;
    gap: 0;
  }
  
  .nav-menu.open {
    left: 0;
  }

  .nav-item > a {
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border-radius: var(--border-radius-sm);
    width: 100%;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .mobile-menu-btn.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  
  .mobile-menu-btn.open span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-btn.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Mobile dropdown: collapse instead of hover-popup */
  .has-dropdown {
    position: static;
  }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    min-width: 0;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    transition: max-height var(--transition-normal);
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius-sm);
  }

  .has-dropdown:hover > .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .has-dropdown.open > .dropdown-menu {
    max-height: 500px;
    padding: 0.25rem 0;
  }

  .dropdown-menu li a {
    padding: 0.65rem 1rem 0.65rem 2rem;
  }
  
  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .form-group.full-width {
    grid-column: span 1;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .results-grand-total {
    font-size: 1.85rem;
  }
  
  .unit-conversions {
    grid-template-columns: 1fr;
  }
  
  .section {
    padding: 3rem 0;
  }
}

/* --- Print Stylesheet --- */
@media print {
  body {
    background-color: #ffffff;
    color: #000000;
    font-size: 12pt;
  }
  
  .header-nav,
  .breadcrumb-container,
  .cta-section,
  footer,
  .back-to-top,
  .btn-group,
  .mobile-menu-btn,
  .calc-title-header .btn,
  .form-group select,
  .form-group input,
  .form-group label,
  .checkbox-group,
  .radio-group,
  .results-panel .btn-success {
    display: none !important;
  }
  
  .calculator-layout {
    display: block;
  }
  
  .calc-panel {
    border: none;
    box-shadow: none;
    padding: 0;
    margin-bottom: 2rem;
  }
  
  .results-panel {
    border: 1px solid #000000;
    box-shadow: none;
    padding: 1.5rem;
    position: static;
    page-break-inside: avoid;
  }
  
  .results-table {
    margin-top: 1rem;
    width: 100%;
  }
  
  .results-table tr {
    border-bottom: 1px solid #000000;
  }
  
  .results-table td, .results-table th {
    padding: 0.5rem;
    color: #000000 !important;
  }
  
  .results-grand-total {
    color: #000000 !important;
    font-size: 24pt;
  }
  
  /* Show static input values on print */
  .print-only-inputs {
    display: block !important;
    margin-bottom: 2rem;
  }
  
  .print-input-item {
    font-size: 10pt;
    margin-bottom: 0.25rem;
  }
}

/* Static print block helper (hidden by default) */
.print-only-inputs {
  display: none;
}

/* ==========================================================================
   DESIGN GALLERY STYLES
   ========================================================================== */

.gallery-toolbar {
  margin-bottom: 2.5rem;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.gallery-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  background-color: var(--color-bg-tertiary);
  padding: 0.4rem;
  border-radius: var(--border-radius);
}

.gallery-tab {
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast) ease;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.gallery-tab:hover {
  background-color: rgba(255, 255, 255, 0.5);
  color: var(--color-text-primary);
}

.gallery-tab.active {
  background-color: var(--color-bg-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 3.5rem;
}

.gallery-card {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal) ease, box-shadow var(--transition-normal) ease;
}

.gallery-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border-hover);
}

.gallery-img-wrapper {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background-color: var(--color-bg-tertiary);
}

.gallery-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  cursor: zoom-in;
  transition: transform var(--transition-normal) ease;
}

.gallery-card:hover .gallery-img {
  transform: scale(1.05);
}

.gallery-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background-color: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  color: var(--color-text-light);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  pointer-events: none;
}

.gallery-info {
  padding: 1.5rem;
}

.gallery-info h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.gallery-info p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.color-palette {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  align-items: center;
}

.color-swatch {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  cursor: help;
  position: relative;
  transition: transform var(--transition-fast) ease;
}

.color-swatch:hover {
  transform: scale(1.15);
}

.design-specs {
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.825rem;
  margin-bottom: 0.35rem;
}

.spec-row:last-child {
  margin-bottom: 0;
}

.spec-row span {
  color: var(--color-text-muted);
}

.spec-row strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

.cost-tag {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.8rem;
}

.cost-tag.warning {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
}

/* --- Lightbox Modal Styles --- */
.lightbox-modal {
  display: none;
  position: fixed;
  z-index: 1100;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal) ease;
}

.lightbox-modal.active {
  display: flex;
  opacity: 1;
}

.lightbox-content {
  position: relative;
  max-width: 90%;
  max-height: 80%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--border-radius-sm);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  border: 4px solid var(--color-bg-primary);
}

.lightbox-close {
  position: absolute;
  top: 2rem;
  right: 2rem;
  background: none;
  border: none;
  color: var(--color-text-light);
  font-size: 3rem;
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition-fast) ease, transform var(--transition-fast) ease;
  z-index: 1102;
}

.lightbox-close:hover {
  color: var(--color-danger);
  transform: scale(1.1);
}

.lightbox-caption {
  margin-top: 1rem;
  color: var(--color-text-light);
  font-size: 1.1rem;
  font-weight: 500;
  text-align: center;
}

@media (max-width: 768px) {
  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
  }
  .lightbox-close {
    top: 1rem;
    right: 1rem;
    font-size: 2.5rem;
  }
}