:root {
  --ei-bg-primary: #0b0f19;
  --ei-bg-secondary: #121824;
  --ei-bg-tertiary: #192233;
  --ei-accent-cyan: #00e5ff;
  --ei-accent-cyan-hover: #00b4cc;
  --ei-accent-green: #00e676; /* WhatsApp Green */
  --ei-accent-green-hover: #00b359;
  --ei-text-primary: #f8fafc;
  --ei-text-secondary: #94a3b8;
  --ei-text-muted: #64748b;
  --ei-border-color: #232d42;
  --ei-glow-shadow: 0 0 20px rgba(0, 229, 255, 0.25);
  --ei-green-glow: 0 0 20px rgba(0, 230, 118, 0.25);
  --ei-font-stack: 'Outfit', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--ei-bg-primary);
  color: var(--ei-text-primary);
  font-family: var(--ei-font-stack);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Container alignment helper */
.ei-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Common Button Styles */
.ei-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  cursor: pointer;
  border: none;
}

.ei-btn-primary {
  background-color: var(--ei-accent-cyan);
  color: #0b0f19;
  box-shadow: 0 4px 14px rgba(0, 229, 255, 0.3);
}

.ei-btn-primary:hover {
  background-color: var(--ei-accent-cyan-hover);
  transform: translateY(-2px);
  box-shadow: var(--ei-glow-shadow);
}

.ei-btn-whatsapp {
  background-color: var(--ei-accent-green);
  color: #0b0f19;
  box-shadow: 0 4px 14px rgba(0, 230, 118, 0.3);
}

.ei-btn-whatsapp:hover {
  background-color: var(--ei-accent-green-hover);
  transform: translateY(-2px);
  box-shadow: var(--ei-green-glow);
}

.ei-btn-outline {
  background-color: transparent;
  color: var(--ei-text-primary);
  border: 1px solid var(--ei-border-color);
}

.ei-btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--ei-accent-cyan);
  color: var(--ei-accent-cyan);
  transform: translateY(-2px);
}

/* Section Spacing Guidelines */
.ei-section {
  padding: 80px 0;
  position: relative;
  border-bottom: 1px solid var(--ei-border-color);
}

/* Dynamic background transitions */
.ei-section-alt {
  background-color: var(--ei-bg-secondary);
}

/* Typography Utilities */
h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
}

.ei-section-header {
  text-align: center;
  margin-bottom: 50px;
}

.ei-section-header h2 {
  font-size: 36px;
  color: var(--ei-text-primary);
  margin-bottom: 16px;
}

.ei-section-header p {
  font-size: 18px;
  color: var(--ei-text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* Common Subpage Header styles (to make secondary pages look great) */
.ei-page-header {
  padding: 100px 0 60px 0;
  background: radial-gradient(circle at 50% 50%, rgba(0, 229, 255, 0.05) 0%, rgba(11, 15, 25, 0) 70%);
  text-align: center;
  border-bottom: 1px solid var(--ei-border-color);
}

.ei-page-header h1 {
  font-size: 44px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff 40%, var(--ei-accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.ei-page-header p {
  font-size: 18px;
  color: var(--ei-text-secondary);
  max-width: 800px;
  margin: 0 auto;
}

/* Navigation System Styles (Shared across website) */
.ei-nav {
  background-color: rgba(11, 15, 25, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ei-border-color);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
  height: 70px;
}

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

.ei-logo {
  font-size: 22px;
  font-weight: 800;
  color: var(--ei-text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ei-logo span {
  color: var(--ei-accent-cyan);
}

.ei-nav-menu {
  display: flex;
  gap: 24px;
  list-style: none;
}

.ei-nav-link {
  color: var(--ei-text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.ei-nav-link:hover, .ei-nav-link.active {
  color: var(--ei-accent-cyan);
}

.ei-nav-cta {
  display: flex;
  align-items: center;
}

/* Simple mobile menu button */
.ei-menu-toggle {
  display: none;
  font-size: 24px;
  color: var(--ei-text-primary);
  background: none;
  border: none;
  cursor: pointer;
}

/* Footer styling */
.ei-footer {
  background-color: var(--ei-bg-secondary);
  padding: 60px 0 30px 0;
  border-top: 1px solid var(--ei-border-color);
}

.ei-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.ei-footer-col h4 {
  font-size: 16px;
  color: var(--ei-text-primary);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ei-footer-col p {
  font-size: 14px;
  color: var(--ei-text-secondary);
  margin-bottom: 16px;
}

.ei-footer-links {
  list-style: none;
}

.ei-footer-links li {
  margin-bottom: 10px;
}

.ei-footer-links a {
  color: var(--ei-text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s ease;
}

.ei-footer-links a:hover {
  color: var(--ei-accent-cyan);
}

.ei-footer-bottom {
  border-top: 1px solid var(--ei-border-color);
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--ei-text-muted);
}

/* Target mobile scroll rules */
@media (max-width: 992px) {
  .ei-nav-menu {
    display: none; /* Can toggle via JS classes */
  }
  .ei-menu-toggle {
    display: block;
  }
  .ei-footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .ei-section {
    padding: 60px 0;
  }
  .ei-section-header h2 {
    font-size: 28px; /* Mobile minimum rule */
  }
  body {
    font-size: 16px; /* Mobile body rule */
  }
}

/* ============================================================
   PORTFOLIO / OUR WORK PAGE
   ============================================================ */
.ei-portfolio-intro { max-width: 800px; margin: 0 auto 50px auto; text-align: center; }
.ei-portfolio-intro p { color: var(--ei-text-secondary); font-size: 16px; line-height: 1.7; }
.ei-portfolio-filter { display: flex; justify-content: center; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
.ei-filter-btn { background: var(--ei-bg-secondary); border: 1px solid var(--ei-border-color); color: var(--ei-text-secondary); padding: 10px 22px; border-radius: 8px; cursor: pointer; font-family: 'Outfit', sans-serif; font-size: 14px; font-weight: 500; transition: all 0.2s ease; }
.ei-filter-btn:hover, .ei-filter-btn.active { background: var(--ei-accent-cyan); color: #0a0f1a; border-color: var(--ei-accent-cyan); }
.ei-portfolio-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.ei-portfolio-card { background: var(--ei-bg-secondary); border: 1px solid var(--ei-border-color); border-radius: 12px; overflow: hidden; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.ei-portfolio-card:hover { transform: translateY(-6px); box-shadow: 0 12px 30px rgba(0,210,255,0.1); }
.ei-portfolio-thumb { width: 100%; height: 200px; background: linear-gradient(135deg, rgba(0,210,255,0.15), rgba(114,9,183,0.15)); display: flex; align-items: center; justify-content: center; }
.ei-portfolio-thumb i { font-size: 48px; color: var(--ei-accent-cyan); opacity: 0.6; }
.ei-portfolio-body { padding: 24px; }
.ei-portfolio-body h3 { font-size: 18px; color: var(--ei-text-primary); margin-bottom: 8px; }
.ei-portfolio-body p { font-size: 14px; color: var(--ei-text-secondary); line-height: 1.6; margin-bottom: 12px; }
.ei-portfolio-tag { display: inline-block; background: rgba(0,210,255,0.1); color: var(--ei-accent-cyan); font-size: 12px; padding: 4px 12px; border-radius: 20px; font-weight: 500; }

/* PAGE HEADER (all inner pages) */
.ei-page-header { background: linear-gradient(135deg, var(--ei-bg-secondary) 0%, var(--ei-bg-tertiary) 100%); border-bottom: 1px solid var(--ei-border-color); padding: 80px 0 60px; text-align: center; }
.ei-page-header h1 { font-size: 42px; font-weight: 800; color: var(--ei-text-primary); margin-bottom: 16px; }
.ei-page-header p { font-size: 18px; color: var(--ei-text-secondary); max-width: 650px; margin: 0 auto; }

/* SERVICE PAGES — sidebar layout */
.ei-cctv-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; margin-top: 40px; }
.ei-sidebar-card { background-color: var(--ei-bg-secondary); border: 1px solid var(--ei-border-color); padding: 30px; border-radius: 12px; margin-bottom: 30px; }
.ei-sidebar-card h3 { font-size: 20px; margin-bottom: 16px; color: var(--ei-text-primary); border-bottom: 1px solid var(--ei-border-color); padding-bottom: 10px; }
.ei-sidebar-links { list-style: none; padding: 0; margin: 0; }
.ei-sidebar-links li { margin-bottom: 12px; }
.ei-sidebar-links a { color: var(--ei-text-secondary); text-decoration: none; font-size: 15px; display: flex; align-items: center; gap: 8px; transition: color 0.2s ease; }
.ei-sidebar-links a:hover { color: var(--ei-accent-cyan); }
.ei-sidebar-links i { color: var(--ei-accent-cyan); font-size: 12px; }
.ei-article-content h2 { font-size: 28px; margin: 35px 0 16px 0; color: var(--ei-accent-cyan); border-bottom: 1px solid var(--ei-border-color); padding-bottom: 8px; }
.ei-article-content h3 { font-size: 22px; margin: 28px 0 12px 0; color: var(--ei-text-primary); }
.ei-article-content p { color: var(--ei-text-secondary); margin-bottom: 18px; font-size: 16px; line-height: 1.7; }

/* RESPONSIVE */
@media (max-width: 992px) { .ei-portfolio-grid { grid-template-columns: repeat(2, 1fr); } .ei-cctv-grid { grid-template-columns: 1fr; } }
@media (max-width: 600px) { .ei-portfolio-grid { grid-template-columns: 1fr; } .ei-page-header h1 { font-size: 28px; } }