/* ==========================================================================
   EXTRA SOLUTIONS LIMITED (ESL) - PROGRESSIVE DESIGN SYSTEM
   Modern, High-Performance Corporate CSS
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root, [data-theme="light"] {
  /* Color Palette - Default Light Theme */
  --bg-primary: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #F1F5F9;
  --bg-glass: rgba(0, 0, 0, 0.02);
  --border-color: #E2E8F0;
  --border-hover: rgba(16, 185, 129, 0.4);
  
  --primary-emerald: #10B981;
  --primary-emerald-hover: #059669;
  --primary-cyan: #06B6D4;
  --accent-glow: rgba(16, 185, 129, 0.15);
  
  --text-main: #0F172A;
  --text-muted: #475569;
  --text-dim: #64748B;
  
  /* Typography */
  --font-heading: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Radii & Shadows */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 0 25px rgba(16, 185, 129, 0.2);
  
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --container-width: 1240px;
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --bg-primary: #070D1B;
  --bg-surface: #0F172A;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(16, 185, 129, 0.3);
  
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 25px rgba(16, 185, 129, 0.2);
}

/* Reset & Base */
*, *::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-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

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

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

ul {
  list-style: none;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Section Common Styling */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--accent-glow);
  border: 1px solid var(--border-hover);
  color: var(--primary-emerald);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* Navigation Header */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.navbar .nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo img {
  height: 48px;
  width: 48px;
  object-fit: contain;
  border-radius: 8px;
}

.brand-logo .brand-text {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
}

.brand-logo .brand-text span {
  color: var(--primary-emerald);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 8px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-emerald);
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  transition: var(--transition);
}

.theme-toggle-btn:hover {
  border-color: var(--primary-emerald);
  color: var(--primary-emerald);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-emerald), #059669);
  color: #FFFFFF;
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  border-color: var(--primary-emerald);
  color: var(--primary-emerald);
  background: var(--bg-card-hover);
}

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

/* Hero Section */
.hero-section {
  padding: 160px 0 100px;
  background: radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(6, 182, 212, 0.06) 0%, transparent 50%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-title {
  font-size: 3.25rem;
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero-title span {
  color: var(--primary-emerald);
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 540px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.stat-item .stat-number {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--primary-emerald);
}

.stat-item .stat-label {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 500;
}

.hero-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

.hero-image-wrapper img {
  width: 100%;
  height: 520px;
  object-fit: cover;
}

.floating-card {
  position: absolute;
  bottom: 24px;
  left: 24px;
  right: 24px;
  padding: 20px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}

.floating-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--primary-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.floating-text h4 {
  font-size: 0.95rem;
  color: var(--text-main);
  margin-bottom: 2px;
}

.floating-text p {
  font-size: 0.825rem;
  color: var(--text-muted);
}

/* Feature Grid Cards */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 32px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.service-card:hover .card-img {
  border-color: var(--primary-emerald);
  transform: scale(1.02);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.service-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: var(--accent-glow);
  color: var(--primary-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 24px;
}

.service-title {
  font-size: 1.35rem;
  margin-bottom: 14px;
}

.service-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
  flex-grow: 1;
}

.service-list {
  list-style: none;
  margin-bottom: 24px;
}

.service-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}

.service-list li svg {
  color: var(--primary-emerald);
  flex-shrink: 0;
  margin-top: 3px;
}

/* Interactive Methodology Workflow */
.methodology-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
}

.methodology-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.tab-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  padding: 18px 20px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
}

.tab-btn:hover {
  border-color: var(--primary-emerald);
  color: var(--text-main);
}

.tab-btn.active {
  background: var(--accent-glow);
  border-color: var(--primary-emerald);
  color: var(--primary-emerald);
}

.tab-num {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  opacity: 0.7;
  margin-bottom: 4px;
}

.tab-title {
  font-size: 1.05rem;
  font-weight: 600;
}

.tab-content-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel-title {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.panel-desc {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.tag-types-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.tag-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: var(--radius-sm);
  text-align: center;
}

.tag-card h5 {
  font-size: 0.9rem;
  color: var(--primary-emerald);
  margin-bottom: 6px;
}

.tag-card p {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Interactive ROI Calculator */
.calc-section {
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-primary) 100%);
  border-y: 1px solid var(--border-color);
}

.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.form-range {
  width: 100%;
  accent-color: var(--primary-emerald);
  cursor: pointer;
}

.form-select, .form-input, .form-textarea {
  width: 100%;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary-emerald);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

.calc-result-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
}

.result-val {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary-emerald);
  margin: 12px 0;
}

/* Client Portfolio Matrix */
.portfolio-filters {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.filter-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent-glow);
  border-color: var(--primary-emerald);
  color: var(--primary-emerald);
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 24px;
}

.client-logo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 120px;
  transition: var(--transition);

}

.client-logo-card img {
  max-height: 54px;
  max-width: 120px;
  object-fit: contain;
  filter: brightness(0.9) contrast(1.1);
  transition: var(--transition);
}

.client-logo-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-emerald);
  box-shadow: var(--shadow-sm);
}

.client-logo-card:hover img {
  filter: none;

}

.client-name {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 8px;
  text-align: center;
  font-weight: 500;
}

/* Team Section */
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
}

.team-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.team-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.team-avatar {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary-emerald), var(--primary-cyan));
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
}

.team-info h3 {
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.team-info p {
  font-size: 0.875rem;
  color: var(--primary-emerald);
  font-weight: 600;
}

.team-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.team-tag {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.team-bio {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Regional Footprint & Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.offices-nav {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.office-tab {
  flex: 1;
  padding: 12px;
  text-align: center;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.office-tab.active {
  background: var(--accent-glow);
  border-color: var(--primary-emerald);
  color: var(--primary-emerald);
}

.office-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 24px;
}

.office-card h4 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: var(--primary-emerald);
}

.contact-detail-item {
  display: flex;
  gap: 14px;
  margin-bottom: 16px;
}

.contact-detail-item svg {
  color: var(--primary-emerald);
  flex-shrink: 0;
  margin-top: 4px;
}

.contact-form-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
}

/* Footer */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 80px 0 40px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand p {
  margin-top: 16px;
  color: var(--text-dim);
  max-width: 320px;
}

.footer-title {
  font-size: 1rem;
  color: var(--text-main);
  margin-bottom: 20px;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a:hover {
  color: var(--primary-emerald);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid,
  .calc-card,
  .contact-grid,
  .tab-content-box {
    grid-template-columns: 1fr;
  }
  
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .methodology-tabs {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--bg-surface);
    flex-direction: column;
    padding: 40px 24px;
    align-items: flex-start;
    transition: var(--transition);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .mobile-toggle {
    display: block;
  }

  .hero-title {
    font-size: 2.25rem;
  }

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

  .methodology-tabs {
    grid-template-columns: 1fr;
  }

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