/* ============================================================
   Informatics Optical - Main Stylesheet (style.css)
   Premium Optical Showroom Design
   Color Palette:
   Primary: #0D6EFD
   Secondary: #0B1F3A
   Accent: #00C2FF
   White & Light Gray Backgrounds
   ============================================================ */

/* ---------- CSS Variables & Root Settings ---------- */
:root {
  --primary: #0D6EFD;
  --primary-rgb: 13, 110, 253;
  --secondary: #0B1F3A;
  --secondary-rgb: 11, 31, 58;
  --accent: #00C2FF;
  --accent-rgb: 0, 194, 255;
  --white: #ffffff;
  --light-gray: #f8f9fa;
  --medium-gray: #6c757d;
  --dark: #212529;
  --border-color: rgba(0,0,0,0.08);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.08);
  --card-radius: 1rem;
  --transition: all 0.3s ease;
  --font-family: 'Poppins', sans-serif;
}

/* Dark Mode Overrides */
[data-bs-theme="dark"] {
  --white: #1a1d23;
  --light-gray: #2a2d35;
  --dark: #f8f9fa;
  --medium-gray: #adb5bd;
  --border-color: rgba(255,255,255,0.1);
  --glass-bg: rgba(30, 33, 40, 0.75);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.3);
  --bs-body-color: #e9ecef;
  --bs-body-bg: #0f1117;
  --bs-heading-color: #f8f9fa;
}

[data-bs-theme="dark"] body {
  background-color: var(--bs-body-bg);
  color: var(--bs-body-color);
}

[data-bs-theme="dark"] .bg-light-subtle {
  background-color: var(--light-gray) !important;
}

[data-bs-theme="dark"] .bg-white {
  background-color: #1e2128 !important;
}

[data-bs-theme="dark"] .text-muted {
  color: #ced4da !important;
}

/* ---------- Global Styles ---------- */
body {
  font-family: var(--font-family);
  overflow-x: hidden;
  scroll-behavior: smooth;
  transition: background-color 0.3s ease, color 0.3s ease;
}

::selection {
  background: var(--primary);
  color: #fff;
}

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

a:hover {
  color: #0b5ed7;
}

.btn-primary {
  background-color: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.3);
}

.btn-primary:hover {
  background-color: #0b5ed7;
  border-color: #0a58ca;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.4);
}

.btn-accent {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #000;
  font-weight: 600;
}

.btn-accent:hover {
  background-color: #00aee0;
  border-color: #00a3d4;
  color: #000;
}

.text-accent {
  color: var(--accent) !important;
}

/* ---------- Preloader ---------- */
.preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  transition: opacity 0.4s ease, visibility 0.4s;
}

.preloader.fade-out {
  opacity: 0;
  visibility: hidden;
}

.spinner {
  text-align: center;
}

/* ---------- Top Header ---------- */
.top-header {
  background-color: var(--secondary);
  font-size: 0.9rem;
}

.top-header a {
  color: rgba(255,255,255,0.8);
}

.top-header a:hover {
  color: #fff;
}

/* ---------- Sticky Navigation ---------- */
.navbar {
  transition: var(--transition);
  background-color: var(--white);
}

[data-bs-theme="dark"] .navbar {
  background-color: #1e2128;
}

.navbar.sticky-active {
  box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

.navbar-brand {
  font-size: 1.6rem;
  letter-spacing: -0.5px;
}

.nav-link {
  position: relative;
  color: var(--dark) !important;
  padding: 0.5rem 1rem !important;
  font-weight: 500;
}

[data-bs-theme="dark"] .nav-link {
  color: #e9ecef !important;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

/* ---------- Search Overlay ---------- */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.85);
  z-index: 1050;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 20vh;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease;
}

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

.search-overlay-content {
  width: 90%;
  max-width: 600px;
  position: relative;
}

.btn-close-search {
  position: absolute;
  top: -60px;
  right: 0;
  background: none;
  border: none;
  color: #fff;
  font-size: 2.5rem;
  cursor: pointer;
  line-height: 1;
}

.search-input {
  padding: 1rem 1.5rem;
  border-radius: 50px;
  font-size: 1.1rem;
  border: none;
  background: rgba(255,255,255,0.15);
  color: #fff;
  backdrop-filter: blur(10px);
}

.search-input::placeholder {
  color: rgba(255,255,255,0.6);
}

.search-results {
  max-height: 60vh;
  overflow-y: auto;
}

/* ---------- Hero Carousel ---------- */
.hero-slide {
  position: relative;
  height: 85vh;
  min-height: 600px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
}

.slide-1 { background-image: url('https://images.unsplash.com/photo-1574258495973-f010dfbb5371?w=1400&h=800&fit=crop'); }
.slide-2 { background-image: url('https://images.unsplash.com/photo-1588776814546-1ffcf47267a5?w=1400&h=800&fit=crop'); }
.slide-3 { background-image: url('https://images.unsplash.com/photo-1572635196237-14b3f281503f?w=1400&h=800&fit=crop'); }

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(11,31,58,0.8) 0%, rgba(13,110,253,0.6) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-content h1 {
  line-height: 1.2;
  text-shadow: 2px 2px 8px rgba(0,0,0,0.4);
}

.carousel-indicators [data-bs-target] {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: transparent;
  opacity: 1;
}

.carousel-indicators .active {
  background: #fff;
  border-color: #fff;
}

/* ---------- Glassmorphism Cards ---------- */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--card-radius);
  box-shadow: var(--glass-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}

[data-bs-theme="dark"] .glass-card:hover {
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

/* ---------- Feature Cards ---------- */
.feature-card {
  padding: 2rem 1.5rem;
  text-align: center;
}

.feature-icon i {
  transition: var(--transition);
  display: inline-block;
}

.feature-card:hover .feature-icon i {
  transform: scale(1.2) rotate(-10deg);
  color: var(--accent);
}

/* ---------- About Section ---------- */
.about-image-wrapper {
  border-radius: 1rem;
  overflow: hidden;
}

.about-badge {
  background: rgba(255,255,255,0.9);
}

/* ---------- Product Cards ---------- */
.product-card {
  border-radius: var(--card-radius);
  overflow: hidden;
  background: var(--white);
}

[data-bs-theme="dark"] .product-card {
  background: #1e2128;
}

.product-img-wrapper {
  position: relative;
  overflow: hidden;
}

.product-img {
  transition: transform 0.4s ease;
  height: 250px;
  object-fit: cover;
}

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

.product-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  opacity: 0;
  transition: var(--transition);
  display: flex;
  gap: 10px;
  z-index: 3;
}

.product-card:hover .product-overlay {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.product-overlay button {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.quick-view-btn, .add-to-cart-btn {
  cursor: pointer;
}

/* ---------- Service Cards ---------- */
.service-card {
  transition: var(--transition);
}

.service-card:hover {
  border-color: var(--primary);
}

.service-icon i {
  transition: var(--transition);
}

.service-card:hover .service-icon i {
  transform: rotateY(180deg);
  color: var(--accent);
}

/* ---------- Special Offer Banner ---------- */
.offer-banner {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
  position: relative;
}

.offer-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(255,255,255,0.05)"/></svg>');
  background-size: cover;
}

.countdown-item {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(5px);
}

/* ---------- Gallery ---------- */
.gallery-card {
  position: relative;
  cursor: pointer;
  overflow: hidden;
  border-radius: 0.5rem;
}

.gallery-img {
  transition: transform 0.5s ease;
  height: 250px;
  object-fit: cover;
}

.gallery-card:hover .gallery-img {
  transform: scale(1.1);
}

.gallery-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(13,110,253,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.gallery-card:hover .gallery-overlay {
  opacity: 1;
}

/* Gallery Filter Buttons */
.filter-btn.active {
  background: var(--primary) !important;
  color: #fff !important;
  border-color: var(--primary) !important;
}

/* ---------- Lightbox ---------- */
.lightbox {
  display: none;
  position: fixed;
  z-index: 2000;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.9);
  align-items: center;
  justify-content: center;
}

.lightbox.active {
  display: flex;
}

.lightbox-content {
  max-width: 90%;
  max-height: 80vh;
  border-radius: 0.5rem;
}

.lightbox-close {
  position: absolute;
  top: 30px;
  right: 40px;
  color: #fff;
  font-size: 3rem;
  cursor: pointer;
}

.lightbox-caption {
  position: absolute;
  bottom: 20px;
  color: #fff;
  font-size: 1.1rem;
}

/* ---------- Testimonials ---------- */
.testimonial-card {
  background: var(--white);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-color);
}

.testimonial-avatar {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border: 3px solid var(--primary);
}

/* ---------- FAQ Accordion ---------- */
.accordion-button:not(.collapsed) {
  background-color: rgba(var(--primary-rgb), 0.1);
  color: var(--primary);
  box-shadow: none;
}

.accordion-button:focus {
  box-shadow: none;
  border-color: var(--primary);
}

/* ---------- Contact Form ---------- */
.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 0.2rem rgba(var(--primary-rgb), 0.25);
}

/* ---------- Footer ---------- */
.footer {
  background-color: var(--secondary);
}

.footer a:hover {
  color: var(--accent) !important;
}

.footer .social-icons a:hover {
  transform: translateY(-3px);
  display: inline-block;
}

/* ---------- Back to Top Button ---------- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.4);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-5px);
}

/* ---------- Responsive Adjustments (partially) ---------- */
@media (max-width: 768px) {
  .hero-slide {
    height: 70vh;
    min-height: 450px;
  }
  .hero-content h1 {
    font-size: 2rem;
  }
  .about-image-wrapper img {
    height: auto;
  }
}