/* ==========================================================================
   Jaswanth Engineering Services - Design System & Global Styles
   ========================================================================== */

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

:root {
  /* Brand Color Palette */
  --color-primary: #080451;       /* Deep Navy Blue */
  --color-secondary: #0088cb;     /* Bright Engineering Blue */
  --color-accent: #a99009;        /* Gold / Olive highlight */
  --color-accent-light: #fef2ae;  /* Pale Gold highlight */
  
  /* Neutral Palette */
  --color-bg-white: #ffffff;
  --color-bg-light: #f5f6fa;
  --color-bg-dark: #050336;
  --color-text-dark: #1b1b1b;
  --color-text-muted: #5e6d82;
  --color-text-light: #ffffff;
  --color-border: #e2e8f0;
  
  /* Typography */
  --font-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Outfit', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 5rem;
  
  /* UI Components */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  --box-shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --box-shadow-md: 0 8px 16px rgba(0, 0, 0, 0.06);
  --box-shadow-lg: 0 16px 32px rgba(8, 4, 81, 0.08);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Dimensions */
  --header-height: 80px;
  --header-height-shrink: 64px;
  --container-width: 1200px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-primary);
}

h1 {
  font-size: 2.75rem;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 2rem;
  margin-bottom: 1.25rem;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1.25rem;
  color: var(--color-text-muted);
}

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

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

ul {
  list-style: none;
}

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.section {
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-xxl);
  position: relative;
}

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

.section-bg-dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
}

.section-bg-dark h1,
.section-bg-dark h2,
.section-bg-dark h3,
.section-bg-dark p {
  color: var(--color-text-light);
}

.section-title-wrap {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.section-subtitle {
  color: var(--color-secondary);
  text-transform: uppercase;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 2px;
  margin-bottom: 0.5rem;
}

/* Header & Navigation */
.site-header {
  position: fixed;
  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: 1000;
  transition: height var(--transition-normal), background-color var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  align-items: center;
}

.site-header.shrink {
  height: var(--header-height-shrink);
  background-color: var(--color-bg-white);
  box-shadow: var(--box-shadow-sm);
  border-bottom: none;
}

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

.site-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-primary);
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  letter-spacing: -0.5px;
}

.site-logo span {
  font-size: 0.75rem;
  color: var(--color-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-top: 2px;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-family: var(--font-primary);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-primary);
  padding: 0.5rem 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-secondary);
  transition: width var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-secondary);
}

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

.nav-link.active {
  color: var(--color-secondary);
  font-weight: 600;
}

/* Burger Icon for Mobile */
.burger-menu {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 24px;
  position: relative;
  z-index: 1100;
}

.burger-bar {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
  position: absolute;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  border-radius: 2px;
}

.burger-bar:nth-child(1) { top: 0; }
.burger-bar:nth-child(2) { top: 10px; }
.burger-bar:nth-child(3) { top: 20px; }

/* Buttons Style */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  border: 2px solid transparent;
}

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

.btn-primary:hover {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-secondary);
  color: var(--color-secondary);
}

.btn-secondary:hover {
  background-color: var(--color-secondary);
  color: var(--color-text-light);
  transform: translateY(-2px);
}

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

.btn-accent:hover {
  background-color: #8c7708;
  transform: translateY(-2px);
}

/* Card Components */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

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

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-md);
}

.card-img-wrap {
  width: 100%;
  height: 200px;
  position: relative;
  overflow: hidden;
  background-color: #ccc;
}

.card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.card-content {
  padding: var(--spacing-lg);
}

.card-title {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

/* Footer Section */
.site-footer {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: var(--spacing-xxl) 0 var(--spacing-lg);
  border-top: 4px solid var(--color-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.footer-logo span {
  display: block;
  font-size: 0.75rem;
  color: var(--color-secondary);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.footer-about p {
  color: #a0aec0;
  font-size: 0.9rem;
  max-width: 400px;
}

.footer-title {
  color: var(--color-text-light);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--color-secondary);
}

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

.footer-links a {
  color: #a0aec0;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-secondary);
  padding-left: 5px;
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 1rem;
  color: #a0aec0;
  font-size: 0.9rem;
}

.footer-contact i {
  color: var(--color-secondary);
  margin-top: 3px;
  font-size: 1rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: #718096;
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.footer-bottom a {
  color: #a0aec0;
}

.footer-bottom a:hover {
  color: var(--color-secondary);
}

/* Accessibility Focus Indicator styling */
:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 3px;
}

/* ==========================================================================
   Lightbox Gallery Overlay Styles
   ========================================================================== */
.lightbox-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(4, 2, 43, 0.95);
  backdrop-filter: blur(8px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

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

.lightbox-content {
  position: relative;
  max-width: 85%;
  max-height: 80%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-img {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--border-radius-sm);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  border: 4px solid var(--color-primary);
}

.lightbox-caption {
  margin-top: var(--spacing-sm);
  color: var(--color-text-light);
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 500;
  text-align: center;
  text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.lightbox-close {
  position: absolute;
  top: 30px;
  right: 40px;
  color: var(--color-text-light);
  font-size: 2.5rem;
  font-weight: 300;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.lightbox-close:hover {
  color: var(--color-secondary);
}

.lightbox-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--color-text-light);
  font-size: 2.5rem;
  cursor: pointer;
  padding: var(--spacing-md);
  transition: color var(--transition-fast), transform var(--transition-fast);
  user-select: none;
  z-index: 2100;
}

.lightbox-btn:hover {
  color: var(--color-secondary);
  transform: translateY(-50%) scale(1.1);
}

.lightbox-prev {
  left: 20px;
}

.lightbox-next {
  right: 20px;
}

body.no-scroll {
  overflow: hidden !important;
}

/* Page Preloader spinner overlay styling */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-left-color: var(--color-secondary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.page-loader.loaded {
  opacity: 0;
  visibility: hidden;
}