/* Volcanic Obsidian Architecture Studio Theme */

/* ==================== ROOT VARIABLES ==================== */
:root {
  --primary-color: #D32F2F;
  --secondary-color: #212121;
  --dark-obsidian: #0a0a0a;
  --light-obsidian: #1a1a1a;
  --volcanic-glow: rgba(211, 47, 47, 0.3);
  --text-light: #ffffff;
  --text-muted: #b0b0b0;
  --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-obsidian: 0 10px 40px rgba(0, 0, 0, 0.8);
  --glow-effect: 0 0 20px rgba(211, 47, 47, 0.5);
}

/* ==================== BASE STYLES ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--dark-obsidian) !important;
  color: var(--text-light) !important;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ==================== NAVIGATION ==================== */
.navbar {
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--dark-obsidian) 100%) !important;
  backdrop-filter: blur(10px);
  box-shadow: 0 5px 30px rgba(211, 47, 47, 0.2);
  transition: var(--transition-smooth);
  padding: 1rem 0;
  z-index: 9999;
}

.navbar.scrolled {
  background: rgba(33, 33, 33, 0.95) !important;
  box-shadow: var(--shadow-obsidian);
}

.navbar-brand {
  color: var(--text-light) !important;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  transition: var(--transition-smooth);
  position: relative;
}

.navbar-brand::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--primary-color);
  transition: var(--transition-smooth);
}

.navbar-brand:hover::after {
  width: 100%;
}

.navbar-brand:hover {
  color: var(--primary-color) !important;
  transform: translateY(-2px);
}

.navbar-toggler {
  border: 2px solid var(--primary-color) !important;
  padding: 0.5rem 0.75rem;
  transition: var(--transition-smooth);
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 0.25rem rgba(211, 47, 47, 0.25) !important;
}

.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='%23D32F2F' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}

.nav-link {
  color: var(--text-light) !important;
  font-weight: 500;
  padding: 0.5rem 1.2rem !important;
  margin: 0 0.2rem;
  position: relative;
  transition: var(--transition-smooth);
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 1px;
}

.nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition-smooth);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color) !important;
  transform: translateY(-2px);
}

.nav-link:hover::before,
.nav-link.active::before {
  width: 80%;
}

/* ==================== HERO SECTION ==================== */
.hero-section {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--dark-obsidian) 0%, var(--secondary-color) 50%, #1a0a0a 100%);
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 100px 0 50px;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(211, 47, 47, 0.15) 0%, transparent 50%);
  animation: pulseGlow 8s ease-in-out infinite;
}

.hero-section .object-fit-cover {
  object-fit: cover;
  opacity: 0.15;
  filter: grayscale(50%);
  mix-blend-mode: luminosity;
}

.obsidian-shard {
  position: absolute;
  background: linear-gradient(135deg, rgba(211, 47, 47, 0.3) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(80px);
  animation: floatShard 15s ease-in-out infinite;
}

.obsidian-shard:nth-child(1) {
  width: 400px;
  height: 400px;
  top: -100px;
  right: -100px;
  animation-delay: 0s;
}

.obsidian-shard:nth-child(2) {
  width: 300px;
  height: 300px;
  bottom: -50px;
  left: -50px;
  animation-delay: 5s;
}

.obsidian-shard:nth-child(3) {
  width: 250px;
  height: 250px;
  top: 50%;
  left: 50%;
  animation-delay: 10s;
}

@keyframes floatShard {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(30px, -30px) scale(1.1); }
  50% { transform: translate(-20px, 20px) scale(0.9); }
  75% { transform: translate(20px, 30px) scale(1.05); }
}

@keyframes pulseGlow {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.hero-content {
  position: relative;
  z-index: 2;
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.display-1,
.display-3,
.display-4,
.display-5 {
  font-weight: 800 !important;
  line-height: 1.2;
  text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.8);
  color: var(--text-light) !important;
}

.display-1 {
  background: linear-gradient(135deg, #ffffff 0%, var(--primary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lead {
  color: var(--text-muted) !important;
  font-size: 1.3rem;
  font-weight: 300;
  text-shadow: 1px 1px 5px rgba(0, 0, 0, 0.7);
}

/* ==================== BUTTONS ==================== */
.btn {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  border-radius: 50px;
  transition: var(--transition-smooth);
  border: none;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
  z-index: -1;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-lg {
  background: var(--primary-color) !important;
  color: var(--text-light) !important;
  box-shadow: 0 5px 20px rgba(211, 47, 47, 0.4);
  border: 2px solid var(--primary-color) !important;
}

.btn-lg:hover {
  background: #b71c1c !important;
  color: var(--text-light) !important;
  transform: translateY(-3px);
  box-shadow: var(--glow-effect), 0 10px 30px rgba(211, 47, 47, 0.5);
}

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

.btn-outline-light:hover {
  background: var(--text-light) !important;
  color: var(--secondary-color) !important;
  border-color: var(--text-light) !important;
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.3);
}

.btn-light {
  background: var(--text-light) !important;
  color: var(--secondary-color) !important;
  border: 2px solid var(--text-light) !important;
}

.btn-light:hover {
  background: transparent !important;
  color: var(--text-light) !important;
  border-color: var(--text-light) !important;
  transform: translateY(-3px);
}

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

.btn-outline-dark:hover {
  background: var(--primary-color) !important;
  color: var(--text-light) !important;
  border-color: var(--primary-color) !important;
  transform: translateY(-3px);
}

/* ==================== SECTIONS ==================== */
.py-5 {
  background: var(--dark-obsidian);
  position: relative;
}

.container {
  position: relative;
  z-index: 2;
}

.h2,
.h4,
.h5 {
  color: var(--text-light) !important;
  font-weight: 700;
}

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

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

.text-white-50 {
  color: rgba(255, 255, 255, 0.5) !important;
}

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

/* ==================== IMAGES ==================== */
.img-fluid {
  border-radius: 15px;
  box-shadow: var(--shadow-obsidian);
  transition: var(--transition-smooth);
  border: 3px solid rgba(211, 47, 47, 0.3);
}

.img-fluid:hover {
  transform: scale(1.05) rotate(2deg);
  box-shadow: var(--glow-effect), var(--shadow-obsidian);
}

/* ==================== CARDS ==================== */
.col-md-6,
.col-lg-4,
.col-lg-6 {
  transition: var(--transition-smooth);
}

.p-3,
.p-4,
.p-5 {
  background: linear-gradient(135deg, var(--light-obsidian) 0%, var(--secondary-color) 100%);
  border-radius: 15px;
  border: 1px solid rgba(211, 47, 47, 0.2);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.p-3::before,
.p-4::before,
.p-5::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(211, 47, 47, 0.1), transparent);
  transition: left 0.7s;
}

.p-3:hover::before,
.p-4:hover::before,
.p-5:hover::before {
  left: 100%;
}

.p-3:hover,
.p-4:hover,
.p-5:hover {
  transform: translateY(-10px);
  box-shadow: var(--glow-effect), var(--shadow-obsidian);
  border-color: var(--primary-color);
}

.card {
  background: linear-gradient(135deg, var(--light-obsidian) 0%, var(--secondary-color) 100%) !important;
  border: 1px solid rgba(211, 47, 47, 0.3) !important;
  border-radius: 15px;
  transition: var(--transition-smooth);
  color: var(--text-light) !important;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: var(--glow-effect), var(--shadow-obsidian);
}

.card-body {
  background: transparent !important;
}

/* ==================== PROGRAM CARDS ==================== */
.program-card {
  background: linear-gradient(135deg, var(--light-obsidian) 0%, var(--secondary-color) 100%) !important;
  border: 2px solid rgba(211, 47, 47, 0.3);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.program-card:hover {
  transform: translateY(-10px);
  border-color: var(--primary-color);
  box-shadow: var(--glow-effect), var(--shadow-obsidian);
}

.program-image {
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}

.program-hover-overlay {
  background: rgba(211, 47, 47, 0.9);
  opacity: 0;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.progress {
  background: rgba(255, 255, 255, 0.1) !important;
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar {
  background: linear-gradient(90deg, var(--primary-color) 0%, #ff5252 100%) !important;
  transition: width 1s ease-in-out;
}

/* ==================== ICONS ==================== */
.bi {
  transition: var(--transition-smooth);
}

.bi-lightning-charge-fill,
.bi-diagram-3-fill,
.bi-speedometer2,
.bi-person-check-fill,
.bi-people-fill,
.bi-heart-pulse-fill,
.bi-fire,
.bi-trophy,
.bi-shield-check {
  color: var(--primary-color) !important;
  font-size: 2.5rem;
  margin-bottom: 1rem;
  filter: drop-shadow(0 0 10px rgba(211, 47, 47, 0.5));
}

.p-3:hover .bi,
.p-4:hover .bi,
.card:hover .bi {
  transform: scale(1.2) rotate(10deg);
}

/* ==================== FORMS ==================== */
.form-control,
.form-select {
  background: rgba(255, 255, 255, 0.05) !important;
  border: 1px solid rgba(211, 47, 47, 0.3) !important;
  color: var(--text-light) !important;
  border-radius: 10px;
  padding: 0.75rem 1rem;
  transition: var(--transition-smooth);
}

.form-control:focus,
.form-select:focus {
  background: rgba(255, 255, 255, 0.08) !important;
  border-color: var(--primary-color) !important;
  box-shadow: 0 0 0 0.25rem rgba(211, 47, 47, 0.25) !important;
  color: var(--text-light) !important;
}

.form-control::placeholder {
  color: var(--text-muted) !important;
}

.form-label {
  color: var(--text-light) !important;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

/* ==================== ACCORDION ==================== */
.accordion {
  --bs-accordion-bg: var(--light-obsidian) !important;
  --bs-accordion-border-color: rgba(211, 47, 47, 0.3) !important;
}

.accordion-item {
  background: var(--light-obsidian) !important;
  border: 1px solid rgba(211, 47, 47, 0.3) !important;
  border-radius: 10px !important;
  margin-bottom: 1rem;
  overflow: hidden;
}

.accordion-button {
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--light-obsidian) 100%) !important;
  color: var(--text-light) !important;
  font-weight: 600;
  border: none !important;
  transition: var(--transition-smooth);
}

.accordion-button:not(.collapsed) {
  background: linear-gradient(135deg, var(--primary-color) 0%, #b71c1c 100%) !important;
  color: var(--text-light) !important;
  box-shadow: none !important;
}

.accordion-button:focus {
  box-shadow: 0 0 0 0.25rem rgba(211, 47, 47, 0.25) !important;
}

.accordion-button::after {
  filter: brightness(0) invert(1);
}

.accordion-body {
  background: var(--light-obsidian) !important;
  color: var(--text-muted) !important;
  border-top: 1px solid rgba(211, 47, 47, 0.2);
}

/* ==================== MODAL ==================== */
.modal-content {
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--dark-obsidian) 100%) !important;
  border: 2px solid rgba(211, 47, 47, 0.5) !important;
  border-radius: 20px;
  box-shadow: var(--glow-effect), var(--shadow-obsidian);
}

.modal-header {
  border-bottom: 1px solid rgba(211, 47, 47, 0.3) !important;
}

.modal-title {
  color: var(--text-light) !important;
  font-weight: 700;
}

.modal-body {
  color: var(--text-light) !important;
}

.btn-close,
.btn-close-white {
  filter: brightness(0) invert(1);
  opacity: 0.8;
}

.btn-close:hover,
.btn-close-white:hover {
  opacity: 1;
  transform: rotate(90deg);
}

/* ==================== BADGE ==================== */
.badge {
  background: var(--primary-color) !important;
  color: var(--text-light) !important;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  box-shadow: 0 5px 15px rgba(211, 47, 47, 0.4);
}

/* ==================== TABLE ==================== */
.table {
  color: var(--text-light) !important;
  border-color: rgba(211, 47, 47, 0.2) !important;
}

.table-hover tbody tr {
  transition: var(--transition-smooth);
}

.table-hover tbody tr:hover {
  background: rgba(211, 47, 47, 0.1) !important;
  color: var(--text-light) !important;
}

.bg-white {
  background: var(--light-obsidian) !important;
}

/* ==================== BENEFIT ITEMS ==================== */
.benefit-item {
  background: linear-gradient(135deg, var(--light-obsidian) 0%, var(--secondary-color) 100%);
  border: 1px solid rgba(211, 47, 47, 0.2);
  border-radius: 15px;
  padding: 1.5rem;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.benefit-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--primary-color);
  transition: height 0.4s;
}

.benefit-item:hover {
  transform: translateX(10px);
  border-color: var(--primary-color);
  box-shadow: var(--glow-effect);
}

.benefit-item:hover::before {
  height: 100%;
}

.flex-shrink-0 {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(211, 47, 47, 0.2);
  border-radius: 50%;
  transition: var(--transition-smooth);
}

.benefit-item:hover .flex-shrink-0 {
  background: var(--primary-color);
  transform: rotate(360deg);
}

/* ==================== FOOTER ==================== */
footer {
  background: linear-gradient(135deg, var(--dark-obsidian) 0%, var(--secondary-color) 100%);
  border-top: 2px solid rgba(211, 47, 47, 0.3);
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

.list-unstyled li {
  margin-bottom: 0.75rem;
}

.list-unstyled a {
  color: var(--text-muted) !important;
  text-decoration: none !important;
  transition: var(--transition-smooth);
  display: inline-block;
}

.list-unstyled a:hover {
  color: var(--primary-color) !important;
  transform: translateX(5px);
}

.text-decoration-none {
  color: var(--text-muted) !important;
  transition: var(--transition-smooth);
}

.text-decoration-none:hover {
  color: var(--primary-color) !important;
}

.bi-facebook,
.bi-instagram,
.bi-twitter,
.bi-youtube {
  font-size: 1.5rem;
  color: var(--text-light) !important;
  transition: var(--transition-smooth);
  display: inline-block;
}

.bi-facebook:hover {
  color: #1877f2 !important;
  transform: translateY(-5px);
}

.bi-instagram:hover {
  color: #e4405f !important;
  transform: translateY(-5px);
}

.bi-twitter:hover {
  color: #1da1f2 !important;
  transform: translateY(-5px);
}

.bi-youtube:hover {
  color: #ff0000 !important;
  transform: translateY(-5px);
}

/* ==================== UTILITY CLASSES ==================== */
.shadow {
  box-shadow: var(--shadow-obsidian) !important;
}

.shadow-lg {
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.9) !important;
}

.shadow-sm {
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5) !important;
}

.rounded {
  border-radius: 15px !important;
}

.rounded-3 {
  border-radius: 20px !important;
}

.rounded-circle {
  border-radius: 50% !important;
}

.opacity-75 {
  opacity: 0.75 !important;
}

.opacity-90 {
  opacity: 0.9 !important;
}

.opacity-50 {
  opacity: 0.5 !important;
}

.position-sticky {
  position: sticky !important;
  top: 80px;
  z-index: 100;
}

.text-uppercase {
  text-transform: uppercase;
  letter-spacing: 2px;
}

/* ==================== ANIMATIONS ==================== */
@keyframes slideInFromLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInFromRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 991.98px) {
  .navbar-collapse {
    background: rgba(33, 33, 33, 0.98);
    padding: 1.5rem;
    border-radius: 15px;
    margin-top: 1rem;
    border: 1px solid rgba(211, 47, 47, 0.3);
  }
  
  .nav-link {
    padding: 0.75rem 1rem !important;
    border-bottom: 1px solid rgba(211, 47, 47, 0.1);
  }
  
  .nav-link:last-child {
    border-bottom: none;
  }
  
  .display-1 {
    font-size: 3rem !important;
  }
  
  .display-3 {
    font-size: 2.5rem !important;
  }
  
  .display-4 {
    font-size: 2rem !important;
  }
  
  .display-5 {
    font-size: 1.5rem !important;
  }
  
  .hero-section {
    min-height: 80vh;
    padding: 80px 0 30px;
  }
  
  .btn-lg {
    padding: 0.75rem 2rem !important;
    font-size: 1rem;
  }
}

@media (max-width: 767.98px) {
  .display-1 {
    font-size: 2.5rem !important;
  }
  
  .display-3 {
    font-size: 2rem !important;
  }
  
  .lead {
    font-size: 1.1rem;
  }
  
  .hero-section {
    min-height: 70vh;
  }
  
  .navbar-brand {
    font-size: 1.3rem;
  }
  
  .p-3,
  .p-4,
  .p-5 {
    padding: 1.5rem !important;
  }
}

@media (max-width: 575.98px) {
  .container-fluid {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  
  .display-1 {
    font-size: 2rem !important;
  }
  
  .hero-section {
    min-height: 60vh;
  }
  
  .btn-lg {
    padding: 0.625rem 1.5rem !important;
    font-size: 0.9rem;
  }
  
  .bi-lightning-charge-fill,
  .bi-diagram-3-fill,
  .bi-speedometer2,
  .bi-person-check-fill,
  .bi-people-fill,
  .bi-heart-pulse-fill {
    font-size: 2rem;
  }
}

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--dark-obsidian);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary-color) 0%, #b71c1c 100%);
  border-radius: 10px;
  border: 2px solid var(--dark-obsidian);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, #ff5252 0%, var(--primary-color) 100%);
}

/* ==================== SELECTION ==================== */
::selection {
  background: var(--primary-color);
  color: var(--text-light);
}

::-moz-selection {
  background: var(--primary-color);
  color: var(--text-light);
}

/* ==================== LOADING ANIMATION ==================== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--dark-obsidian);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  transition: opacity 0.5s, visibility 0.5s;
}

.loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
}

.spinner {
  width: 60px;
  height: 60px;
  border: 4px solid rgba(211, 47, 47, 0.2);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ==================== BACK TO TOP BUTTON ==================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: var(--text-light);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  box-shadow: var(--glow-effect);
  z-index: 9998;
}

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

.back-to-top:hover {
  background: #b71c1c;
  transform: translateY(-5px);
  box-shadow: 0 0 30px rgba(211, 47, 47, 0.8);
}

/* ==================== ACCESSIBILITY ==================== */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* ==================== PRINT STYLES ==================== */
@media print {
  .navbar,
  .back-to-top,
  .btn,
  footer {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
}