/* ==========================================
   More-Fire Gas Website - Global Styles
   ========================================== */

/* --- CSS Variables --- */
:root {
  /* Primary Colors */
  --primary-blue: #0066cc;
  --primary-red: #dc3545;
  --secondary-blue: #004799;
  --light-blue: #cce6ff;
  
  /* Neutral Colors */
  --white: #ffffff;
  --light-gray: #f8f9fa;
  --gray: #6c757d;
  --dark-gray: #343a40;
  --black: #000000;
  
  /* Glass Morphism */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
  --glass-backdrop: blur(10px);
  
  /* Typography */
  --font-family: 'Poppins', sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Spacing */
  --section-padding: 5rem 0;
  --container-padding: 1rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Border Radius */
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
}

/* --- Global Reset & Base Styles --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-regular);
  line-height: 1.6;
  color: var(--dark-gray);
  background-color: var(--white);
  overflow-x: hidden;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: 3rem;
  font-weight: var(--font-weight-extrabold);
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 2rem;
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
}

/* --- Links --- */
a {
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  text-decoration: none;
}

/* --- Images --- */
img {
  max-width: 100%;
  height: auto;
}

/* --- Utility Classes --- */
.text-primary {
  color: var(--primary-blue) !important;
}

.bg-primary {
  background-color: var(--primary-blue) !important;
}

.text-danger {
  color: var(--primary-red) !important;
}

.bg-danger {
  background-color: var(--primary-red) !important;
}

/* --- Section Styles --- */
.section-title {
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: 1rem;
  position: relative;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--gray);
  margin-bottom: 2rem;
}

/* --- Button Styles --- */
.btn {
  border-radius: var(--border-radius-lg);
  font-weight: var(--font-weight-medium);
  padding: 0.75rem 1.5rem;
  transition: var(--transition-normal);
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--secondary-blue), var(--primary-blue));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--white);
}

.btn-outline-primary {
  border: 2px solid var(--primary-blue);
  color: var(--primary-blue);
  background: transparent;
}

.btn-outline-primary:hover {
  background-color: var(--primary-blue);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-outline-light {
  border: 2px solid var(--white);
  color: var(--white);
  background: transparent;
}

.btn-outline-light:hover {
  background-color: var(--white);
  color: var(--primary-blue);
  border-color: var(--white);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

/* --- Glass Morphism Effects --- */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--border-radius-lg);
}

/* --- Scroll Progress Indicator --- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-blue), var(--primary-red));
  z-index: 9999;
  transition: width var(--transition-fast);
}

/* --- Scroll to Top Button --- */
.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  z-index: 1000;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.scroll-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--secondary-blue), var(--primary-blue));
}

/* --- WhatsApp Float Button --- */
.whatsapp-float {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  width: 60px;
  height: 60px;
  background: #25d366;
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  z-index: 1000;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-lg);
  animation: pulse 2s infinite;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-xl);
  color: var(--white);
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(37, 211, 102, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(37, 211, 102, 0);
  }
}

/* --- Loading Animation --- */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--light-gray);
  border-radius: 50%;
  border-top-color: var(--primary-blue);
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- Responsive Typography --- */
@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  h3 {
    font-size: 1.75rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .section-subtitle {
    font-size: 1.1rem;
  }
}

@media (max-width: 576px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .btn {
    padding: 0.6rem 1.2rem;
  }
  
  .btn-lg {
    padding: 0.8rem 1.6rem;
    font-size: 1rem;
  }
}

/* --- Custom Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--light-gray);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--primary-blue), var(--secondary-blue));
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(var(--secondary-blue), var(--primary-blue));
}

/* --- Header & Navigation --- */
.header {
  position: relative;
  z-index: 1000;
}

.navbar {
  background: var(--glass-bg) !important;
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border-bottom: 1px solid var(--glass-border);
  padding: 1rem 0;
  transition: var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95) !important;
  box-shadow: var(--shadow-md);
}

.navbar-brand {
  display: flex;
  align-items: center;
  font-weight: var(--font-weight-bold);
  font-size: 1.25rem;
  color: var(--white);
  text-decoration: none;
}

.navbar.scrolled .navbar-brand {
  color: var(--dark-gray);
}

.logo {
  height: 40px;
  width: auto;
  margin-right: 0.5rem;
}

.brand-text {
  font-weight: var(--font-weight-bold);
  color: inherit;
}

.navbar-nav .nav-link {
  color: var(--white) !important;
  font-weight: var(--font-weight-medium);
  margin: 0 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-md);
  transition: var(--transition-fast);
  position: relative;
}

.navbar.scrolled .navbar-nav .nav-link {
  color: var(--dark-gray) !important;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.navbar.scrolled .navbar-nav .nav-link:hover,
.navbar.scrolled .navbar-nav .nav-link.active {
  background: var(--light-blue);
  color: var(--primary-blue) !important;
}

.navbar-toggler {
  border: 2px solid var(--white);
  border-radius: var(--border-radius-md);
  padding: 0.375rem 0.75rem;
  position: relative;
  z-index: 1001;
  background: transparent;
  transition: var(--transition-fast);
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 0.2rem rgba(255, 255, 255, 0.3);
  outline: none;
}

.navbar.scrolled .navbar-toggler {
  border-color: var(--primary-blue);
}

.navbar.scrolled .navbar-toggler:focus {
  box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.3);
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
  transition: var(--transition-fast);
}

/* Animated hamburger to X transformation */
.navbar-toggler.active .navbar-toggler-icon {
  transform: rotate(45deg);
}

.navbar.scrolled .navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%280, 102, 204, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.cta-btn {
  background: linear-gradient(135deg, var(--primary-red), #e55353);
  border: none;
  font-weight: var(--font-weight-semibold);
}

.cta-btn:hover {
  background: linear-gradient(135deg, #c82333, var(--primary-red));
  transform: translateY(-2px);
}

/* --- Footer --- */
.footer {
  position: relative;
  background: var(--dark-gray) !important;
}

.footer-section {
  margin-bottom: 2rem;
}

.footer-logo {
  display: flex;
  align-items: center;
}

.footer-logo-img {
  height: 40px;
  width: auto;
  margin-right: 0.5rem;
}

.footer-title {
  color: var(--white);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 1rem;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.5px;
}

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

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--gray);
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary-blue);
  transform: translateX(3px);
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--primary-blue);
  color: var(--white);
  border-radius: 50%;
  transition: var(--transition-normal);
}

.social-link:hover {
  background: var(--secondary-blue);
  transform: translateY(-2px);
  color: var(--white);
}

.contact-info {
  margin-top: 1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  margin-bottom: 0.75rem;
  color: var(--gray);
}

.contact-item i {
  margin-right: 0.75rem;
  width: 18px;
  color: var(--primary-blue);
}

.contact-item a {
  color: var(--gray);
  transition: var(--transition-fast);
}

.contact-item a:hover {
  color: var(--primary-blue);
}

.copyright {
  color: var(--gray);
}

.developer-credit a {
  color: var(--primary-blue);
  font-weight: var(--font-weight-medium);
  transition: var(--transition-fast);
}

.developer-credit a:hover {
  color: var(--light-blue);
  text-decoration: underline;
}

/* --- Focus States for Accessibility --- */
.btn:focus,
.nav-link:focus,
a:focus {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

/* --- Responsive Navigation & Footer --- */
@media (max-width: 768px) {
  /* Mobile menu overlay */
  .mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 998;
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
  }
  
  .mobile-menu-overlay.show {
    opacity: 1;
    visibility: visible;
  }
  
  .navbar-collapse {
    position: absolute;
    top: 100%;
    left: 15px;
    right: 15px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    margin: 0;
    padding: 1.5rem;
    box-shadow: var(--shadow-xl);
    transform: translateY(-20px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }
  
  .navbar-collapse.show {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .navbar-collapse .navbar-nav {
    flex-direction: column;
    width: 100%;
    margin: 0;
  }
  
  .navbar-collapse .nav-item {
    margin: 0;
  }
  
  .navbar-collapse .nav-link {
    color: var(--dark-gray) !important;
    margin: 0.25rem 0;
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius-md);
    font-weight: var(--font-weight-medium);
    transition: var(--transition-fast);
    text-align: left;
    border: 1px solid transparent;
    display: flex;
    align-items: center;
  }
  
  .navbar-collapse .nav-link:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
  }
  
  .navbar-collapse .nav-link i {
    margin-right: 0.5rem;
    width: 20px;
    text-align: center;
  }
  
  .navbar-collapse .nav-link:hover,
  .navbar-collapse .nav-link.active {
    background: var(--light-blue);
    color: var(--primary-blue) !important;
    border-color: var(--glass-border);
    transform: translateX(5px);
  }
  
  .navbar-collapse .navbar-cta {
    margin: 1rem 0 0 0;
    width: 100%;
  }
  
  .navbar-collapse .cta-btn {
    width: 100%;
    justify-content: center;
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    font-size: 1rem;
  }
  
  /* Prevent menu overlap with page content */
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
  }
  
  /* Prevent body scroll when mobile menu is open */
  body.mobile-menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
  }
  
  /* Mobile floating elements adjustments */
  .whatsapp-float,
  .scroll-to-top {
    width: 50px;
    height: 50px;
    z-index: 997;
  }
  
  .whatsapp-float {
    bottom: 1rem;
    left: 1rem;
  }
  
  .scroll-to-top {
    bottom: 1rem;
    right: 1rem;
  }
  
  /* Ensure proper stacking and no conflicts */
  .navbar-collapse.show + .mobile-menu-overlay {
    display: block;
  }
  
  /* Animation for hamburger menu */
  .navbar-toggler.active {
    transform: rotate(0deg);
  }
  
  .navbar-toggler.active .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M6 6l18 18M6 24l18-18'/%3e%3c/svg%3e");
  }
  
  .navbar.scrolled .navbar-toggler.active .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%280, 102, 204, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M6 6l18 18M6 24l18-18'/%3e%3c/svg%3e");
  }
}

/* --- Print Styles --- */
@media print {
  .scroll-to-top,
  .whatsapp-float,
  .scroll-progress {
    display: none !important;
  }
}

/* ==========================================
   Performance Optimization Styles (MVP-16)
   ========================================== */

/* --- Font Loading Optimization --- */
body {
  font-display: swap; /* Swap fonts immediately when loaded */
}

.fonts-loaded {
  font-family: var(--font-family);
}

/* --- Image Optimization --- */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

img[loading="lazy"] {
  opacity: 0;
  transition: opacity var(--transition-normal);
}

img[loading="lazy"].loaded {
  opacity: 1;
}

/* Placeholder for lazy loading images */
img.lazy {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- Critical Resource Optimization --- */
.critical-resource {
  font-display: swap;
}

/* --- Notification System Styles --- */
.notification-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  pointer-events: none;
  max-width: 400px;
}

.notification {
  background: var(--white);
  border-left: 4px solid var(--primary-blue);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  margin-bottom: 1rem;
  overflow: hidden;
  pointer-events: auto;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  min-width: 300px;
}

.notification.show {
  transform: translateX(0);
}

.notification-success {
  border-left-color: #28a745;
}

.notification-error {
  border-left-color: var(--primary-red);
}

.notification-warning {
  border-left-color: #ffc107;
}

.notification-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
}

.notification-message {
  flex: 1;
  color: var(--dark-gray);
  font-weight: var(--font-weight-medium);
}

.notification-close {
  background: none;
  border: none;
  color: var(--gray);
  cursor: pointer;
  font-size: 1rem;
  margin-left: 1rem;
  padding: 0;
  transition: color var(--transition-fast);
}

.notification-close:hover {
  color: var(--dark-gray);
}

/* --- Loading States --- */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--light-gray);
  border-top: 4px solid var(--primary-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.btn.loading {
  position: relative;
  pointer-events: none;
  opacity: 0.7;
}

.btn.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* --- Accessibility Improvements --- */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus indicators for keyboard navigation */
.focus-visible,
*:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

/* Skip to content link */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-blue);
  color: var(--white);
  padding: 8px;
  text-decoration: none;
  z-index: 10001;
  border-radius: var(--border-radius-sm);
}

.skip-to-content:focus {
  top: 6px;
}

/* --- Performance Optimizations --- */
/* Optimize repaints and reflows */
.gpu-optimized {
  transform: translateZ(0);
  will-change: transform;
}

/* Reduce layout thrashing */
.layout-stable {
  contain: layout style;
}

/* Image aspect ratio containers to prevent layout shift */
.aspect-ratio-16-9 {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%;
  overflow: hidden;
}

.aspect-ratio-16-9 img,
.aspect-ratio-16-9 video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.aspect-ratio-4-3 {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 75%;
  overflow: hidden;
}

.aspect-ratio-4-3 img,
.aspect-ratio-4-3 video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- SEO and Schema Markup Helper Classes --- */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}