/* 
 * Kesari Technology - Digital Marketing & IT Solutions Agency
 * Custom Stylesheet
 * Primary: #0B4EA2 (Deep Kesari Blue)
 * Secondary: #F7941D (Kesari Saffron Orange)
 * Accent: #2563EB
 * Dark: #1F2937 | Light: #F8FAFC | White: #FFFFFF
 */

:root {
  --primary: #0B4EA2;
  --primary-hover: #083b7a;
  --primary-light: #EFF6FF;
  --secondary: #F7941D;
  --secondary-hover: #e08112;
  --secondary-light: #FFF7ED;
  --accent: #2563EB;
  --dark: #1F2937;
  --dark-heading: #0F172A;
  --light-bg: #F8FAFC;
  --border-color: #F1F5F9;
  --border-glass: rgba(255, 255, 255, 0.6);
  --text-muted: #64748B;
  --body-color: #475569;
  --white: #FFFFFF;
  --shadow-sm: 0 4px 12px rgba(11, 78, 162, 0.03);
  --shadow-md: 0 10px 30px -10px rgba(11, 78, 162, 0.08);
  --shadow-lg: 0 20px 45px -15px rgba(11, 78, 162, 0.14);
  --shadow-blue: 0 12px 30px -6px rgba(37, 99, 235, 0.25);
  --shadow-orange: 0 12px 28px -8px rgba(247, 148, 29, 0.35);
  --gradient-primary: linear-gradient(135deg, #0B4EA2 0%, #2563EB 100%);
  --gradient-secondary: linear-gradient(135deg, #F7941D 0%, #FFB03A 100%);
  --gradient-text: linear-gradient(90deg, #0B4EA2 0%, #F7941D 100%);
  --gradient-mixed: linear-gradient(135deg, #0B4EA2 0%, #1e40af 50%, #F7941D 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.8) 100%);
}

/* Global Styles */
body {
  font-family: 'Poppins', system-ui, -apple-system, sans-serif;
  color: var(--body-color);
  background-color: var(--light-bg);
  overflow-x: hidden;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--dark-heading);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

a {
  text-decoration: none;
  transition: all 0.3s ease;
}

/* Typography Utilities */
.text-primary-custom { color: var(--primary) !important; }
.text-secondary-custom { color: var(--secondary) !important; }
.bg-light-custom { background-color: var(--light-bg) !important; }

.text-gradient-primary {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-secondary {
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background-color: #EFF6FF;
  color: var(--primary);
  border: 1px solid #DBEAFE;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.06);
}

.section-tag.secondary {
  background-color: #FFF7ED;
  color: var(--secondary);
  border-color: #FFEDD5;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

@media (min-width: 992px) {
  .section-title {
    font-size: 2.85rem;
  }
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.08rem;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

/* Custom Buttons */
.btn-primary-custom {
  background: var(--gradient-primary);
  color: var(--white);
  padding: 12px 30px;
  border-radius: 9999px;
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  box-shadow: var(--shadow-blue);
  transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary-custom:hover {
  background: linear-gradient(135deg, #083b7a 0%, #1d4ed8 100%);
  color: var(--white);
  transform: scale(1.04);
  box-shadow: 0 16px 36px -6px rgba(37, 99, 235, 0.4);
}

.btn-secondary-custom {
  background: #0B4EA2;
  color: var(--white);
  padding: 14px 32px;
  border-radius: 16px;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  box-shadow: 0 12px 28px -6px rgba(11, 78, 162, 0.35);
  transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-secondary-custom:hover {
  background: #2563EB;
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 18px 36px -8px rgba(37, 99, 235, 0.45);
}

.btn-outline-custom {
  background: #FFFFFF;
  color: #1F2937;
  border: 1px solid #E2E8F0;
  padding: 12px 30px;
  border-radius: 16px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
}

.btn-outline-custom:hover {
  border-color: var(--primary);
  color: var(--primary);
  background-color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Glassmorphism Card Base */
.glass-card {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 28px;
  box-shadow: 0 20px 40px -15px rgba(11, 78, 162, 0.1);
}

/* 1. Navbar & Header */
.top-bar {
  background-color: #082d5e;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.85rem;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.top-bar a {
  color: rgba(255, 255, 255, 0.9);
}

.top-bar a:hover {
  color: var(--secondary);
}

.whatsapp-top-link {
  background-color: #25D366 !important;
  color: #FFFFFF !important;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.82rem;
  display: inline-flex;
  align-items: center;
  transition: all 0.25s ease;
  box-shadow: 0 2px 8px rgba(37, 211, 102, 0.35);
  text-decoration: none !important;
}

.whatsapp-top-link:hover {
  background-color: #20BA5A !important;
  color: #FFFFFF !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.45);
}

.main-navbar {
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 16px 0;
  transition: all 0.3s ease;
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
}

.main-navbar.sticky-top-active {
  box-shadow: 0 10px 30px rgba(11, 78, 162, 0.06);
  padding: 12px 0;
  background-color: rgba(255, 255, 255, 0.95);
}

.header-logo {
  transition: transform 0.3s ease, opacity 0.3s ease;
  object-fit: contain;
}

.navbar-brand:hover .header-logo {
  transform: scale(1.02);
}

.footer-logo {
  transition: transform 0.3s ease, opacity 0.3s ease;
  object-fit: contain;
}

.footer-logo:hover {
  transform: scale(1.02);
}

.brand-logo-text {
  font-weight: 800;
  font-size: 1.45rem;
  color: var(--primary);
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.brand-tagline {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #94A3B8;
  margin-top: -4px;
}

.nav-link {
  font-weight: 600;
  color: #4B5563 !important;
  font-size: 0.85rem;
  padding: 6px 12px !important;
  transition: all 0.25s ease;
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 16px;
  right: 16px;
  height: 2px;
  background-color: var(--primary);
  transform: scaleX(0);
  transition: transform 0.25s ease;
  transform-origin: right;
  border-radius: 2px;
}

.nav-link:hover::after, .nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Mega Menu */
.dropdown-mega-menu {
  width: 100%;
  max-width: 900px;
  border-radius: 24px;
  border: 1px solid var(--border-color);
  box-shadow: 0 25px 60px -15px rgba(11, 78, 162, 0.12);
  padding: 24px;
  background: #ffffff;
  margin-top: 12px !important;
}

.mega-menu-service-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 12px;
  border-radius: 16px;
  transition: all 0.25s ease;
}

.mega-menu-service-item:hover {
  background-color: var(--primary-light);
  transform: translateX(4px);
}

.mega-icon-box {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--gradient-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
}

/* 2. Hero Section */
.hero-section {
  position: relative;
  background: #F8FAFC;
  padding: 90px 0 110px 0;
  overflow: hidden;
}

.hero-bg-circle {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.6;
  pointer-events: none;
}

.hero-bg-circle-1 {
  top: -150px;
  right: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(11, 78, 162, 0.12) 0%, rgba(37, 99, 235, 0.08) 100%);
}

.hero-bg-circle-2 {
  bottom: -100px;
  left: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(247, 148, 29, 0.1) 0%, rgba(247, 148, 29, 0.02) 100%);
}

.hero-title {
  font-size: 2.85rem;
  font-weight: 800;
  color: #0F172A;
  letter-spacing: -0.03em;
  line-height: 1.12;
}

@media (min-width: 992px) {
  .hero-title {
    font-size: 3.75rem;
  }
}

.hero-subheading {
  font-size: 1.15rem;
  color: #64748B;
  font-weight: 400;
  margin-top: 20px;
  margin-bottom: 36px;
  line-height: 1.65;
}

/* Hero Visual Canvas & Floating Cards */
.hero-visual-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 460px;
}

.hero-main-illustration {
  width: 100%;
  max-width: 480px;
  border-radius: 32px;
  box-shadow: 0 30px 70px -15px rgba(11, 78, 162, 0.2);
  border: 6px solid var(--white);
  transition: transform 0.5s ease;
  background: #FFFFFF;
}

.floating-analytics-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 14px 18px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 20px 40px rgba(11, 78, 162, 0.12);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 2;
  animation: floatCard 6s ease-in-out infinite alternate;
}

.card-google-ads {
  top: 15px;
  left: -20px;
  animation-delay: 0s;
}

.card-seo-rank {
  bottom: 25px;
  left: -10px;
  animation-delay: 1.5s;
}

.card-facebook-ads {
  top: 45px;
  right: -20px;
  animation-delay: 3s;
}

.card-lead-gen {
  bottom: 35px;
  right: -15px;
  animation-delay: 4.5s;
}

@keyframes floatCard {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-12px); }
}

.analytics-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: white;
  flex-shrink: 0;
}

/* 3. Trusted By / Counter Section */
.stats-section {
  background-color: var(--white);
  padding: 60px 0;
  border-bottom: 1px solid var(--border-color);
  margin-top: -40px;
  position: relative;
  z-index: 3;
}

.stats-card {
  background: var(--light-bg);
  border-radius: 24px;
  padding: 28px 20px;
  border: 1px solid var(--border-color);
  text-align: center;
  transition: all 0.3s ease;
}

.stats-card:hover {
  transform: translateY(-5px);
  border-color: #DBEAFE;
  box-shadow: var(--shadow-md);
  background: #FFFFFF;
}

.stats-number {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}

.stats-label {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--dark-heading);
}

/* 4. About Section */
.about-section {
  padding: 100px 0;
  background-color: var(--white);
}

.about-badge-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--secondary-light);
  color: var(--secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

/* 5. Services Section */
.services-section {
  background-color: var(--light-bg);
  padding: 100px 0;
  position: relative;
}

.service-card {
  background: var(--white);
  border-radius: 24px;
  padding: 34px 28px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(11, 78, 162, 0.03);
  transition: all 0.35s cubic-bezier(0.165, 0.84, 0.44, 1);
  height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: #DBEAFE;
}

.service-card:hover::before {
  opacity: 1;
}

.service-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 22px;
  transition: all 0.3s ease;
}

.service-card:hover .service-icon-box {
  background: var(--gradient-primary);
  color: var(--white);
  transform: scale(1.05);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

.service-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #0F172A;
}

.service-card-text {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 20px;
  flex-grow: 1;
  line-height: 1.6;
}

.service-link {
  color: var(--primary);
  font-weight: 700;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.service-card:hover .service-link {
  color: var(--secondary);
  gap: 10px;
}

/* 6. Why Choose Us (10 Cards) */
.why-section {
  padding: 100px 0;
  background-color: var(--white);
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 26px 22px;
  transition: all 0.3s ease;
  height: 100%;
}

.feature-card:hover {
  border-color: var(--secondary);
  box-shadow: 0 12px 30px rgba(247, 148, 29, 0.12);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--secondary-light);
  color: var(--secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 16px;
}

/* 7. Process Timeline */
.process-section {
  padding: 100px 0;
  background-color: var(--light-bg);
}

.timeline-step-card {
  background: var(--white);
  border-radius: 24px;
  padding: 30px 24px;
  border: 1px solid var(--border-color);
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  height: 100%;
}

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

.timeline-step-badge {
  position: absolute;
  top: -16px;
  left: 24px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--gradient-secondary);
  color: white;
  font-weight: 800;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(247, 148, 29, 0.4);
}

/* 8. Industries We Serve (10 Grid) */
.industries-section {
  padding: 100px 0;
  background-color: var(--white);
}

.industry-card {
  background: var(--light-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 26px 16px;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
}

.industry-card:hover {
  background: var(--primary);
  color: var(--white) !important;
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-blue);
}

.industry-icon {
  font-size: 2.2rem;
  color: var(--primary);
  margin-bottom: 12px;
  transition: color 0.3s ease;
}

.industry-card:hover .industry-icon {
  color: var(--secondary);
}

.industry-card:hover h5 {
  color: var(--white) !important;
}

/* 9. Calculator Widget */
.calc-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #082d5e 0%, #0B4EA2 100%);
  color: var(--white);
}

.calc-box {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 28px;
  padding: 38px;
}

/* 10. Portfolio Section */
.portfolio-section {
  padding: 100px 0;
  background-color: var(--light-bg);
}

.portfolio-filter-btn {
  background: var(--white);
  border: 1px solid var(--border-color);
  color: var(--dark);
  padding: 8px 22px;
  border-radius: 9999px;
  font-size: 0.9rem;
  font-weight: 600;
  margin: 4px;
  transition: all 0.25s ease;
}

.portfolio-filter-btn.active, .portfolio-filter-btn:hover {
  background: var(--gradient-primary);
  color: var(--white);
  border-color: var(--primary);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.25);
}

.portfolio-card {
  background: var(--white);
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.35s ease;
  height: 100%;
}

.portfolio-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.portfolio-img-wrapper {
  position: relative;
  overflow: hidden;
  height: 220px;
}

.portfolio-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.portfolio-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(11, 78, 162, 0.85);
  backdrop-filter: blur(4px);
  opacity: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s ease;
}

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

/* 11. Testimonials Slider */
.testimonials-section {
  padding: 100px 0;
  background-color: var(--white);
}

.testimonial-card {
  background: var(--light-bg);
  border-radius: 28px;
  padding: 38px 32px;
  border: 1px solid var(--border-color);
  margin: 10px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.quote-icon {
  font-size: 2.5rem;
  color: rgba(247, 148, 29, 0.35);
  margin-bottom: 12px;
}

.star-rating {
  color: #F59E0B;
  font-size: 0.95rem;
  margin-bottom: 14px;
}

/* 12. FAQ Section */
.faq-section {
  padding: 100px 0;
  background-color: var(--light-bg);
}

.accordion-item {
  border: 1px solid var(--border-color);
  border-radius: 20px !important;
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  background: #FFFFFF;
}

.accordion-button {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--dark-heading);
  padding: 22px 26px;
  background: var(--white);
}

.accordion-button:not(.collapsed) {
  color: var(--primary);
  background-color: var(--primary-light);
  box-shadow: none;
}

.accordion-button:focus {
  box-shadow: none;
  border-color: rgba(11, 78, 162, 0.25);
}

/* 13. CTA Section */
.cta-banner {
  background: var(--gradient-mixed);
  border-radius: 36px;
  padding: 64px 44px;
  color: var(--white);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* 14. Contact & Footer */
.contact-section {
  padding: 100px 0;
  background-color: var(--white);
}

.contact-info-card {
  background: var(--light-bg);
  border-radius: 24px;
  padding: 28px 24px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

.footer {
  background-color: #051a36;
  color: #94a3b8;
  padding-top: 80px;
  padding-bottom: 30px;
  font-size: 0.92rem;
}

.footer-title {
  color: var(--white);
  font-weight: 700;
  font-size: 1.15rem;
  margin-bottom: 22px;
  position: relative;
  padding-bottom: 10px;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 36px;
  height: 3px;
  background: var(--secondary);
  border-radius: 2px;
}

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

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

.footer-links a {
  color: #94a3b8;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-links a:hover {
  color: var(--secondary);
  transform: translateX(4px);
}

/* Floating Widgets */
.floating-whatsapp-btn {
  position: fixed;
  bottom: 28px;
  left: 28px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: #25D366;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.85rem;
  box-shadow: 0 10px 25px rgba(37, 211, 102, 0.4);
  z-index: 999;
  transition: all 0.3s ease;
}

.floating-whatsapp-btn:hover {
  transform: scale(1.1);
  color: white;
}

.back-to-top-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 8px 20px rgba(11, 78, 162, 0.3);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  border: none;
}

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

.back-to-top-btn:hover {
  background: var(--secondary);
  transform: translateY(-4px);
}