/* ==========================================================================
   ABB INFRA - Professional Design System & Stylesheet
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & CSS Variables
   -------------------------------------------------------------------------- */
:root {
  /* Brand Color Palette */
  --bg-dark: #070c1a;
  --bg-card: #0f172a;
  --bg-card-hover: #1e293b;
  --bg-glass: rgba(15, 23, 42, 0.78);
  --bg-glass-card: rgba(30, 41, 59, 0.65);
  
  --primary-navy: #0f172a;
  --accent-gold: #f59e0b;
  --accent-gold-hover: #d97706;
  --accent-gold-glow: rgba(245, 158, 11, 0.35);
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.3);
  --accent-emerald: #10b981;
  --accent-blue: #3b82f6;

  /* Neutral Tones */
  --text-main: #f8fafc;
  --text-body: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-gold: rgba(245, 158, 11, 0.3);
  --border-cyan: rgba(6, 182, 212, 0.3);

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  /* Shadows & Effects */
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
  --shadow-gold: 0 0 25px rgba(245, 158, 11, 0.25);
  --shadow-cyan: 0 0 25px rgba(6, 182, 212, 0.25);

  /* Layout Constants */
  --header-height: 80px;
  --topbar-height: 40px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   2. Reset & General Setup
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-dark);
  color: var(--text-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Container Utility */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Section Common Styles */
.section {
  padding: 6rem 0;
  position: relative;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-full);
  color: var(--accent-gold);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-title span {
  background: linear-gradient(135deg, var(--accent-gold), #fbbf24);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto 3rem auto;
}

.text-center {
  text-align: center;
}

/* Buttons System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-gold), #d97706);
  color: #0f172a;
  box-shadow: var(--shadow-gold);
  font-weight: 700;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.45);
  background: linear-gradient(135deg, #fbbf24, var(--accent-gold));
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.btn-outline-gold {
  background: transparent;
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
}

.btn-outline-gold:hover {
  background: var(--accent-gold);
  color: #0f172a;
  box-shadow: var(--shadow-gold);
}

.btn-icon-right i {
  transition: transform var(--transition-fast);
}

.btn:hover.btn-icon-right i {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   3. Top Banner Bar & Header Nav
   -------------------------------------------------------------------------- */
.top-bar {
  background: #040814;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.85rem;
  color: var(--text-muted);
  height: var(--topbar-height);
  display: flex;
  align-items: center;
}

.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-info-group {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.top-info-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.top-info-item i {
  color: var(--accent-gold);
}

.domain-badge {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan);
  border: 1px solid var(--border-cyan);
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.main-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition-normal);
}

.main-header.scrolled {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  background: rgba(7, 12, 26, 0.94);
}

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

/* Brand Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--accent-gold), #d97706);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0f172a;
  font-size: 1.4rem;
  font-weight: 800;
  box-shadow: var(--shadow-gold);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.1;
  letter-spacing: -0.5px;
}

.logo-subtitle {
  font-size: 0.7rem;
  color: var(--accent-cyan);
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

/* Navigation Links */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--text-body);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-gold);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   4. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-height) - var(--topbar-height));
  display: flex;
  align-items: center;
  padding: 5rem 0;
  overflow: hidden;
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(6, 182, 212, 0.15), transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(245, 158, 11, 0.12), transparent 50%),
              linear-gradient(to right, rgba(7, 12, 26, 0.95) 40%, rgba(7, 12, 26, 0.6));
  z-index: 1;
}

.hero-bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 0;
  filter: brightness(0.65) contrast(1.1);
}

.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.2rem;
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-full);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  letter-spacing: -1px;
}

.hero-title .text-gold {
  color: var(--accent-gold);
  background: linear-gradient(135deg, #fbbf24, var(--accent-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-body);
  margin-bottom: 2.25rem;
  max-width: 600px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-gold);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 0.3rem;
}

/* Quick Estimate Widget in Hero */
.hero-widget-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg), var(--shadow-gold);
}

.widget-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 1rem;
}

.widget-header i {
  color: var(--accent-gold);
  font-size: 1.5rem;
}

.widget-header h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--text-main);
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-body);
  margin-bottom: 0.4rem;
}

.form-select, .form-input, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  transition: var(--transition-fast);
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-gold);
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.2);
}

/* --------------------------------------------------------------------------
   5. Core Services Grid
   -------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 2.2rem;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-gold), var(--accent-cyan));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: rgba(245, 158, 11, 0.3);
  box-shadow: var(--shadow-lg);
  background: var(--bg-card-hover);
}

.service-card:hover::before {
  opacity: 1;
}

.service-icon-box {
  width: 60px;
  height: 60px;
  background: rgba(245, 158, 11, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-gold);
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-gold);
}

.service-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.8rem;
}

.service-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.service-list {
  margin-bottom: 1.5rem;
}

.service-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-body);
  margin-bottom: 0.4rem;
}

.service-list li i {
  color: var(--accent-emerald);
  font-size: 0.85rem;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-gold);
  font-weight: 600;
  font-size: 0.9rem;
}

.service-link:hover i {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   6. Interactive Cost & Timeline Calculator Section
   -------------------------------------------------------------------------- */
.calculator-section {
  background: linear-gradient(180deg, var(--bg-dark), #091124);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.calc-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  overflow: hidden;
  box-shadow: var(--shadow-lg), var(--shadow-gold);
}

.calc-inputs {
  padding: 3rem;
}

.calc-result-panel {
  background: linear-gradient(135deg, #0f172a, #1e293b);
  border-left: 1px solid var(--border-light);
  padding: 3rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.range-slider-group {
  margin-bottom: 1.8rem;
}

.range-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
}

.range-value-badge {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--accent-gold);
  font-size: 1.1rem;
  background: rgba(245, 158, 11, 0.1);
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-gold);
}

input[type="range"] {
  width: 100%;
  height: 8px;
  background: #1e293b;
  border-radius: 4px;
  outline: none;
  accent-color: var(--accent-gold);
  cursor: pointer;
}

.calc-options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.8rem;
}

.calc-option-card {
  border: 1px solid var(--border-light);
  background: rgba(15, 23, 42, 0.6);
  border-radius: var(--radius-sm);
  padding: 1rem;
  cursor: pointer;
  transition: var(--transition-fast);
  text-align: center;
}

.calc-option-card.active, .calc-option-card:hover {
  border-color: var(--accent-gold);
  background: rgba(245, 158, 11, 0.08);
}

.calc-option-card i {
  font-size: 1.5rem;
  color: var(--accent-gold);
  margin-bottom: 0.4rem;
  display: block;
}

.calc-option-card span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

/* Result Box */
.calc-summary-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1.5rem;
}

.calc-price-display {
  margin-bottom: 2rem;
}

.calc-price-amount {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

.calc-price-amount span {
  color: var(--accent-gold);
}

.calc-time-estimate {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-cyan);
  font-size: 1rem;
  font-weight: 600;
  margin-top: 0.5rem;
}

.calc-breakdown-list {
  border-top: 1px dashed var(--border-light);
  padding-top: 1.2rem;
  margin-bottom: 2rem;
}

.calc-breakdown-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-body);
  margin-bottom: 0.5rem;
}

/* --------------------------------------------------------------------------
   7. Filterable Project Portfolio Section
   -------------------------------------------------------------------------- */
.portfolio-filter-bar {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.filter-btn {
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-body);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--accent-gold);
  color: #0f172a;
  border-color: var(--accent-gold);
  box-shadow: var(--shadow-gold);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-normal);
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-gold);
  box-shadow: var(--shadow-lg);
}

.project-img-wrapper {
  position: relative;
  height: 240px;
  overflow: hidden;
}

.project-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .project-img-wrapper img {
  transform: scale(1.08);
}

.project-category-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  padding: 0.3rem 0.8rem;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-sm);
  color: var(--accent-gold);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.project-info {
  padding: 1.75rem;
}

.project-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.project-meta {
  display: flex;
  gap: 1.2rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.project-meta-item i {
  color: var(--accent-cyan);
  margin-right: 0.3rem;
}

.project-highlights {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag-pill {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  color: var(--text-body);
}

/* --------------------------------------------------------------------------
   8. ESG, Quality & Certificates Bar
   -------------------------------------------------------------------------- */
.esg-section {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.05), rgba(16, 185, 129, 0.05));
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.esg-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.esg-card {
  background: var(--bg-card);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.esg-icon {
  width: 50px;
  height: 50px;
  background: rgba(6, 182, 212, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.esg-content h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.esg-content p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   9. Interactive Office Location & Contact Hub
   -------------------------------------------------------------------------- */
.contact-section {
  position: relative;
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.office-selector-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.office-tabs {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 1rem;
}

.office-tab-btn {
  padding: 0.5rem 1rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-weight: 600;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.office-tab-btn.active {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-gold);
}

.office-details-box {
  margin-bottom: 2rem;
}

.office-detail-item {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.office-detail-item i {
  color: var(--accent-gold);
  font-size: 1.2rem;
  margin-top: 0.2rem;
}

.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  color: var(--text-main);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), var(--shadow-gold);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: slideInRight 0.3s forwards;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* --------------------------------------------------------------------------
   10. Modal Dialog Styling
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 8, 20, 0.85);
  backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-container {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  max-width: 750px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2.5rem;
  position: relative;
  box-shadow: var(--shadow-lg), var(--shadow-gold);
}

.modal-close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: rgba(255, 255, 255, 0.08);
  border: none;
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   11. Footer
   -------------------------------------------------------------------------- */
.footer {
  background: #040711;
  border-top: 1px solid var(--border-light);
  padding: 5rem 0 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 1.2rem 0;
}

.social-links {
  display: flex;
  gap: 0.75rem;
}

.social-icon {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-body);
  transition: var(--transition-fast);
}

.social-icon:hover {
  background: var(--accent-gold);
  color: #0f172a;
  transform: translateY(-3px);
}

.footer-column h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--text-main);
  margin-bottom: 1.5rem;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--accent-gold);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* --------------------------------------------------------------------------
   12. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
  }

  .calc-wrapper {
    grid-template-columns: 1fr;
  }

  .calc-result-panel {
    border-left: none;
    border-top: 1px solid var(--border-light);
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 768px) {
  .top-bar {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--bg-dark);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border-light);
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .hero-title {
    font-size: 2.4rem;
  }

  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}