/* ==========================================================================
   Global Reset and Base Styles
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
}

html {
  font-size: 62.5%; /* Sets 1rem = 10px for easier calculations */
  box-sizing: border-box;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  color: #1f2a44; /* Primary text color */
  background: linear-gradient(
    135deg,
    #f8fafc 0%,
    #e2e8f0 100%
  ); /* Light gradient background */
  min-height: 100vh;
  transition: all 0.3s ease;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 80%,
      rgba(59, 130, 246, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(16, 185, 129, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 40% 40%,
      rgba(139, 92, 246, 0.05) 0%,
      transparent 50%
    );
  z-index: -1;
  animation: backgroundShift 20s ease-in-out infinite;
}

body.dark-mode {
  background: linear-gradient(
    135deg,
    #0f172a 0%,
    #1e293b 100%
  ); /* Dark mode gradient */
  color: #e2e8f0;
}

body.dark-mode::before {
  background: radial-gradient(
      circle at 20% 80%,
      rgba(59, 130, 246, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(16, 185, 129, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 40% 40%,
      rgba(139, 92, 246, 0.1) 0%,
      transparent 50%
    );
}

/* ==========================================================================
     Animations
     ========================================================================== */
@keyframes backgroundShift {
  0%,
  100% {
    transform: translateX(0) translateY(0) scale(1);
  }
  25% {
    transform: translateX(-2%) translateY(-1%) scale(1.02);
  }
  50% {
    transform: translateX(1%) translateY(-2%) scale(0.98);
  }
  75% {
    transform: translateX(-1%) translateY(1%) scale(1.01);
  }
}

@keyframes logoFloat {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

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

@keyframes textPulse {
  0%,
  100% {
    opacity: 0.7;
  }
  50% {
    opacity: 1;
  }
}

@keyframes particleFloat {
  0% {
    transform: translateY(100vh) translateX(0) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-100px) translateX(100px) rotate(360deg);
    opacity: 0;
  }
}

@keyframes headerGlow {
  0%,
  100% {
    opacity: 0.3;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(1.05);
  }
}

@keyframes titleGlow {
  0%,
  100% {
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3), 0 0 20px rgba(255, 255, 255, 0.1);
  }
  50% {
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3), 0 0 30px rgba(255, 255, 255, 0.2);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 0.9;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    transform: translateY(3rem);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes buttonPulse {
  0%,
  100% {
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
  }
  50% {
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5),
      0 0 20px rgba(59, 130, 246, 0.2);
  }
}

@keyframes float {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
  100% {
    transform: translateY(0);
  }
}

@keyframes imageReveal {
  from {
    opacity: 0;
    transform: scale(0.8) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes numberGlow {
  0%,
  100% {
    filter: brightness(1);
  }
  50% {
    filter: brightness(1.2);
  }
}

@keyframes operationsGlow {
  0%,
  100% {
    opacity: 0.5;
  }
  50% {
    opacity: 1;
  }
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes iconPulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes tabPulse {
  0%,
  100% {
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
  }
  50% {
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3), 0 0 20px rgba(59, 130, 246, 0.2);
  }
}

@keyframes contentSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes iconFloat {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
}

@keyframes menuItemFade {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ==========================================================================
     Loading Screen
     ========================================================================== */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

body.dark-mode .loading-screen {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.loading-screen::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 80%,
      rgba(59, 130, 246, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(16, 185, 129, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 40% 40%,
      rgba(139, 92, 246, 0.05) 0%,
      transparent 50%
    );
  z-index: -1;
  animation: backgroundShift 20s ease-in-out infinite;
}

body.dark-mode .loading-screen::before {
  background: radial-gradient(
      circle at 20% 80%,
      rgba(59, 130, 246, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(16, 185, 129, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 40% 40%,
      rgba(139, 92, 246, 0.1) 0%,
      transparent 50%
    );
}

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

.loading-content {
  text-align: center;
  color: #e2e8f0;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1),
    rgba(255, 255, 255, 0.05)
  );
  padding: 2rem;
  border-radius: 1rem;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

body.dark-mode .loading-content {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.05),
    rgba(255, 255, 255, 0.02)
  );
  border-color: rgba(255, 255, 255, 0.1);
}

.loading-logo {
  margin-bottom: 1.5rem;
  animation: logoFloat 2.5s ease-in-out infinite;
}

.loading-logo img {
  height: 5rem;
  filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(0%)
    hue-rotate(0deg) brightness(110%) contrast(110%);
  opacity: 0.9;
}

.loading-spinner {
  margin: 1rem 0;
}

.spinner {
  width: 4.5rem;
  height: 4.5rem;
  border: 5px solid rgba(255, 255, 255, 0.2);
  border-left: 5px solid #3b82f6;
  border-radius: 50%;
  animation: spin 0.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.4);
}

body.dark-mode .spinner {
  border-left: 5px solid #60a5fa;
  box-shadow: 0 0 15px rgba(96, 165, 250, 0.4);
}

.loading-text {
  font-size: 1.4rem;
  font-weight: 500;
  color: #e2e8f0;
  letter-spacing: 0.05rem;
  animation: textPulse 2.5s ease-in-out infinite;
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.loading-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.loading-particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(59, 130, 246, 0.4);
  border-radius: 50%;
  animation: particleFloat 15s linear infinite;
}

.loading-particle:nth-child(2n) {
  background: rgba(16, 185, 129, 0.4);
  animation-duration: 18s;
}

.loading-particle:nth-child(3n) {
  background: rgba(139, 92, 246, 0.4);
  animation-duration: 20s;
}

.loading-particle:nth-child(4n) {
  background: rgba(236, 72, 153, 0.4);
  animation-duration: 22s;
}

/* ==========================================================================
     Container
     ========================================================================== */
.container {
  max-width: 120rem;
  margin: 0 auto;
  padding: 0 3rem;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.9);
  z-index: 9999;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

body.dark-mode .nav {
  background: rgba(30, 41, 59, 0.9);
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

.nav.sticky {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  backdrop-filter: saturate(180%) blur(20px);
  transform: translateY(0);
}

body.dark-mode .nav.sticky {
  background: rgba(30, 41, 59, 0.95);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.nav__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 2rem;
  position: relative;
  z-index: 10000;
  min-height: 7rem;
}

.nav__left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav__logo {
  height: 4.5rem;
  transition: all 0.3s ease;
  filter: brightness(0) saturate(100%) invert(20%) sepia(15%) saturate(2000%)
    hue-rotate(200deg) brightness(90%) contrast(90%);
}

.nav__logo:hover {
  transform: scale(1.05) rotate(2deg);
  filter: brightness(0) saturate(100%) invert(25%) sepia(20%) saturate(2500%)
    hue-rotate(200deg) brightness(95%) contrast(95%);
}

body.dark-mode .nav__logo {
  filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(0%)
    hue-rotate(0deg) brightness(100%) contrast(100%);
}

body.dark-mode .nav__logo:hover {
  filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(0%)
    hue-rotate(0deg) brightness(110%) contrast(110%);
}

.nav__right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 1rem;
  position: relative;
  z-index: 10004;
  width: 4.4rem;
  height: 4.4rem;
  border-radius: 0.8rem;
  transition: all 0.3s ease;
  overflow: hidden;
}

.nav__toggle:hover {
  background: linear-gradient(
    135deg,
    rgba(59, 130, 246, 0.2),
    rgba(16, 185, 129, 0.2)
  );
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

body.dark-mode .nav__toggle:hover {
  background: linear-gradient(
    135deg,
    rgba(96, 165, 250, 0.2),
    rgba(52, 211, 153, 0.2)
  );
  box-shadow: 0 4px 12px rgba(96, 165, 250, 0.3);
}

.nav__toggle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.4s ease, height 0.4s ease;
}

.nav__toggle:hover::after {
  width: 200px;
  height: 200px;
}

.nav__toggle-icon {
  position: relative;
  display: block;
  width: 2.5rem;
  height: 0.3rem;
  background-color: #1f2a44;
  transition: all 0.3s ease;
  margin: auto;
}

body.dark-mode .nav__toggle-icon {
  background-color: #e2e8f0;
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 2.5rem;
  height: 0.3rem;
  background-color: #1f2a44;
  transition: all 0.3s ease;
}

body.dark-mode .nav__toggle-icon::before,
body.dark-mode .nav__toggle-icon::after {
  background-color: #e2e8f0;
}

.nav__toggle-icon::before {
  top: -0.8rem;
}

.nav__toggle-icon::after {
  top: 0.8rem;
}

.nav__toggle.active .nav__toggle-icon {
  background-color: transparent;
}

.nav__toggle.active .nav__toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.nav__toggle.active .nav__toggle-icon::after {
  transform: rotate(-45deg);
  top: 0;
}

.nav__links {
  display: flex;
  list-style: none;
  align-items: center;
  position: relative;
  z-index: 10001;
  gap: 2.5rem;
}

.nav__link {
  font-size: 1.8rem;
  font-weight: 500;
  color: #1f2a44;
  text-decoration: none;
  transition: all 0.3s ease;
  position: relative;
  z-index: 10002;
  cursor: pointer;
  padding: 0.5rem 0.8rem;
  border-radius: 0.6rem;
}

body.dark-mode .nav__link {
  color: #e2e8f0;
}

.nav__link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #3b82f6, #10b981);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

body.dark-mode .nav__link::before {
  background: linear-gradient(90deg, #60a5fa, #34d399);
}

.nav__link:hover,
.nav__link:focus {
  color: #3b82f6;
  transform: translateY(-2px);
  background: linear-gradient(
    135deg,
    rgba(59, 130, 246, 0.1),
    rgba(16, 185, 129, 0.1)
  );
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

body.dark-mode .nav__link:hover,
body.dark-mode .nav__link:focus {
  color: #60a5fa;
  background: linear-gradient(
    135deg,
    rgba(96, 165, 250, 0.1),
    rgba(52, 211, 153, 0.1)
  );
  box-shadow: 0 4px 12px rgba(96, 165, 250, 0.2);
}

.nav__link:hover::before,
.nav__link:focus::before {
  width: 80%;
}

.nav__link--btn {
  background: linear-gradient(135deg, #3b82f6, #10b981);
  color: #ffffff;
  padding: 1.2rem 2rem;
  border-radius: 0.8rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease,
    background-color 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  display: inline-block;
  text-decoration: none;
}

body.dark-mode .nav__link--btn {
  background: linear-gradient(135deg, #60a5fa, #34d399);
  box-shadow: 0 4px 12px rgba(96, 165, 250, 0.3);
}

.nav__link--btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  transition: transform 0.4s ease;
  z-index: 0;
}

.nav__link--btn:hover::after,
.nav__link--btn:focus::after {
  transform: translate(-50%, -50%) scale(1.5);
}

.nav__link--btn:hover,
.nav__link--btn:focus {
  background: linear-gradient(135deg, #2563eb, #059669);
  color: #e6e6e6;
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

body.dark-mode .nav__link--btn:hover,
body.dark-mode .nav__link--btn:focus {
  background: linear-gradient(135deg, #4b9cfa, #22c78b);
  color: #f0f0f0;
  box-shadow: 0 6px 20px rgba(96, 165, 250, 0.4);
}

.nav__link--btn > * {
  position: relative;
  z-index: 1;
}

.dark-mode-btn {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  color: #1f2a44;
  transition: all 0.3s ease;
  position: relative;
  z-index: 10003;
  overflow: hidden;
}

body.dark-mode .dark-mode-btn {
  color: #e2e8f0;
}

.dark-mode-btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.4s ease, height 0.4s ease;
}

.dark-mode-btn:hover::after,
.dark-mode-btn:focus::after {
  width: 200px;
  height: 200px;
}

.dark-mode-btn:hover,
.dark-mode-btn:focus {
  background: linear-gradient(
    135deg,
    rgba(59, 130, 246, 0.2),
    rgba(16, 185, 129, 0.2)
  );
  transform: scale(1.05) rotate(5deg);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

body.dark-mode .dark-mode-btn:hover,
body.dark-mode .dark-mode-btn:focus {
  background: linear-gradient(
    135deg,
    rgba(96, 165, 250, 0.2),
    rgba(52, 211, 153, 0.2)
  );
  box-shadow: 0 4px 12px rgba(96, 165, 250, 0.3);
}

.dark-mode-btn svg {
  width: 2.4rem;
  height: 2.4rem;
  transition: transform 0.5s ease, opacity 0.5s ease;
}

.dark-mode-btn.animating svg {
  transform: rotate(360deg);
  opacity: 0.5;
}

body.dark-mode .dark-mode-btn .sun,
body.dark-mode .dark-mode-btn .sun-ray {
  opacity: 0;
  transform: scale(0);
}

body:not(.dark-mode) .dark-mode-btn .moon {
  opacity: 0;
  transform: scale(0);
}

body.dark-mode .dark-mode-btn .moon {
  opacity: 1;
  transform: scale(1);
}

body:not(.dark-mode) .dark-mode-btn .sun,
body:not(.dark-mode) .dark-mode-btn .sun-ray {
  opacity: 1;
  transform: scale(1);
}

/* ==========================================================================
     Header
     ========================================================================== */
.header {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
      135deg,
      rgba(59, 130, 246, 0.7),
      rgba(16, 185, 129, 0.6),
      rgba(139, 92, 246, 0.5)
    ),
    url('../img/hero-img.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: #ffffff;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding-top: 8rem;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 30% 20%,
      rgba(255, 255, 255, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 70% 80%,
      rgba(255, 255, 255, 0.05) 0%,
      transparent 50%
    );
  animation: headerGlow 8s ease-in-out infinite;
}

.header__content {
  max-width: 90rem;
  position: relative;
  z-index: 2;
  padding: 0 2rem;
}

.header__title {
  font-size: 5.6rem;
  font-weight: 700;
  margin-bottom: 3rem;
  line-height: 1.2;
  text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  animation: slideUp 1s ease-out, titleGlow 3s ease-in-out infinite 1s;
  position: relative;
}

.header__subtitle {
  font-size: 2.6rem;
  font-weight: 400;
  margin-bottom: 4rem;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  animation: slideUp 1s ease-out 0.2s backwards, fadeIn 2s ease-out 0.5s both;
  opacity: 0.9;
}

.header__btns {
  display: flex;
  gap: 2rem;
  justify-content: center;
  animation: slideUp 1s ease-out 0.4s backwards;
}

/* ==========================================================================
     UI Elements
     ========================================================================== */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  width: 0%;
  background: linear-gradient(90deg, #3b82f6, #10b981);
  z-index: 9998;
  transition: width 0.1s linear;
}

.back-to-top {
  position: fixed;
  right: 2rem;
  bottom: 2rem;
  width: 4.4rem;
  height: 4.4rem;
  border-radius: 50%;
  border: none;
  background: #3b82f6;
  color: #ffffff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  cursor: pointer;
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 9997;
}

body.dark-mode .back-to-top {
  background: #60a5fa;
}

.back-to-top.show {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus {
  transform: translateY(-2px);
  background: #2563eb;
}

body.dark-mode .back-to-top:hover,
body.dark-mode .back-to-top:focus {
  background: #3b82f6;
}

/* ==========================================================================
     Buttons
     ========================================================================== */
.btn {
  background-color: #3b82f6;
  color: #ffffff;
  font-size: 1.8rem;
  font-weight: 500;
  padding: 1.2rem 2.5rem;
  border: none;
  border-radius: 0.8rem;
  text-decoration: none;
  transition: all 0.3s;
  display: inline-block;
  position: relative;
  overflow: hidden;
}

body.dark-mode .btn {
  background-color: #60a5fa;
}

.btn:hover,
.btn:focus {
  background-color: #2563eb;
  transform: scale(1.05);
}

body.dark-mode .btn:hover,
body.dark-mode .btn:focus {
  background-color: #3b82f6;
}

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

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

.btn--primary {
  background: linear-gradient(135deg, #3b82f6, #10b981);
  padding: 1.5rem 3rem;
  font-size: 2rem;
  animation: float 3s ease-in-out infinite, buttonPulse 2s ease-in-out infinite;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.btn--primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s ease;
}

.btn--primary:hover::before {
  left: 100%;
}

body.dark-mode .btn--primary {
  background: linear-gradient(135deg, #60a5fa, #34d399);
  box-shadow: 0 8px 25px rgba(96, 165, 250, 0.3);
}

.btn--primary:hover,
.btn--primary:focus {
  background: linear-gradient(135deg, #2563eb, #059669);
  transform: translateY(-2px);
  box-shadow: 0 12px 35px rgba(59, 130, 246, 0.4);
}

body.dark-mode .btn--primary:hover,
body.dark-mode .btn--primary:focus {
  background: linear-gradient(135deg, #3b82f6, #10b981);
  box-shadow: 0 12px 35px rgba(96, 165, 250, 0.4);
}

.btn--scroll-to {
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.3);
  padding: 1.5rem 3rem;
  font-size: 2rem;
  animation: float 3s ease-in-out infinite 0.5s;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.btn--scroll-to::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    45deg,
    transparent,
    rgba(255, 255, 255, 0.1),
    transparent
  );
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.btn--scroll-to:hover::before {
  transform: translateX(100%);
}

body.dark-mode .btn--scroll-to {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn--scroll-to:hover,
.btn--scroll-to:focus {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255, 255, 255, 0.1);
}

body.dark-mode .btn--scroll-to:hover,
body.dark-mode .btn--scroll-to:focus {
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 8px 25px rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
     Highlight
     ========================================================================== */
.highlight {
  position: relative;
  z-index: 1;
  color: #ffffff;
}

.highlight::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #06b6d4;
  opacity: 0.7;
  transform: skewX(-15deg);
  z-index: -1;
}

/* ==========================================================================
     Sections
     ========================================================================== */
.section {
  padding: 8rem 0;
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.section.animate {
  opacity: 1;
  transform: translateY(0);
}

.section--hidden {
  opacity: 0;
  transform: translateY(4rem);
  transition: all 0.5s;
}

.section__title {
  font-size: 4rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 5rem;
  color: #1f2a44;
}

body.dark-mode .section__title {
  color: #e2e8f0;
}

/* ==========================================================================
     Features
     ========================================================================== */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 3rem;
  perspective: 1000px;
}

.feature {
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  padding: 2.5rem;
  border-radius: 1.5rem;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1), 0 4px 10px rgba(0, 0, 0, 0.05);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(59, 130, 246, 0.05),
    rgba(16, 185, 129, 0.05)
  );
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 1;
}

.feature:hover::before {
  opacity: 1;
}

body.dark-mode .feature {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3), 0 4px 10px rgba(0, 0, 0, 0.2);
}

.feature:hover {
  transform: translateY(-8px) rotateX(5deg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15), 0 8px 16px rgba(0, 0, 0, 0.1);
}

body.dark-mode .feature:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 8px 16px rgba(0, 0, 0, 0.3);
}

.feature__img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 1rem;
  margin-bottom: 2rem;
  opacity: 0;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  z-index: 2;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.feature__img.visible {
  opacity: 1;
  animation: imageReveal 0.8s ease-out;
}

.feature:hover .feature__img {
  transform: scale(1.08) rotateY(5deg);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.feature__title {
  font-size: 2.2rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: #1f2a44;
  position: relative;
  z-index: 2;
  transition: color 0.3s ease;
}

.feature:hover .feature__title {
  color: #3b82f6;
}

body.dark-mode .feature__title {
  color: #e2e8f0;
}

body.dark-mode .feature:hover .feature__title {
  color: #60a5fa;
}

.feature p {
  font-size: 1.6rem;
  line-height: 1.6;
  color: #6b7280;
  position: relative;
  z-index: 2;
  transition: color 0.3s ease;
}

body.dark-mode .feature p {
  color: #9ca3af;
}

/* ==========================================================================
     Stats
     ========================================================================== */
.stats {
  display: flex;
  justify-content: center;
  gap: 4rem;
  margin-top: 5rem;
  flex-wrap: wrap;
  perspective: 1000px;
}

.stat {
  text-align: center;
  padding: 2rem;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1),
    rgba(255, 255, 255, 0.05)
  );
  border-radius: 1.5rem;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.stat::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(59, 130, 246, 0.1),
    rgba(16, 185, 129, 0.1)
  );
  opacity: 0;
  transition: opacity 0.3s ease;
}

.stat:hover::before {
  opacity: 1;
}

.stat:hover {
  transform: translateY(-5px) rotateX(5deg);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

body.dark-mode .stat {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.05),
    rgba(255, 255, 255, 0.02)
  );
  border-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .stat:hover {
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.stat__number {
  font-size: 3.6rem;
  font-weight: 700;
  background: linear-gradient(135deg, #3b82f6, #10b981);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: 1rem;
  position: relative;
  z-index: 2;
  animation: numberGlow 2s ease-in-out infinite;
}

body.dark-mode .stat__number {
  background: linear-gradient(135deg, #60a5fa, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat p {
  font-size: 1.6rem;
  color: #6b7280;
  position: relative;
  z-index: 2;
  font-weight: 500;
}

body.dark-mode .stat p {
  color: #9ca3af;
}

/* ==========================================================================
     Operations
     ========================================================================== */
.operations {
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  padding: 5rem;
  border-radius: 2.5rem;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1), 0 10px 20px rgba(0, 0, 0, 0.05),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.operations::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 20%,
      rgba(59, 130, 246, 0.08) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      rgba(16, 185, 129, 0.08) 0%,
      transparent 50%
    ),
    linear-gradient(135deg, rgba(139, 92, 246, 0.03), rgba(236, 72, 153, 0.03));
  z-index: 1;
  animation: operationsGlow 8s ease-in-out infinite;
}

.operations::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(
    from 0deg,
    transparent,
    rgba(59, 130, 246, 0.1),
    transparent
  );
  animation: rotate 20s linear infinite;
  z-index: 0;
}

body.dark-mode .operations {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4), 0 10px 20px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.operations__tab-container {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 3rem;
  position: relative;
  z-index: 2;
  flex-wrap: wrap;
}

.operations__tab {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: linear-gradient(135deg, #ffcb03 0%, #f59e0b 100%);
  color: #1f2a44;
  padding: 1.5rem 2.5rem;
  border-radius: 1.5rem;
  border: none;
  cursor: pointer;
  font-size: 1.6rem;
  font-weight: 600;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(255, 203, 3, 0.3);
  backdrop-filter: blur(10px);
  min-height: 4.4rem;
}

body.dark-mode .operations__tab {
  color: #e2e8f0;
}

.operations__tab-icon {
  width: 2.2rem;
  height: 2.2rem;
  stroke: currentColor;
  fill: none;
  stroke-width: 2.5;
  transition: all 0.3s ease;
}

.operations__tab:hover .operations__tab-icon {
  transform: scale(1.1);
  stroke-width: 3;
}

.operations__tab--active .operations__tab-icon {
  animation: iconPulse 2s ease-in-out infinite;
}

.operations__tab--1 {
  background: linear-gradient(135deg, #ffcb03 0%, #f59e0b 100%);
  box-shadow: 0 4px 15px rgba(255, 203, 3, 0.3);
}

.operations__tab--2 {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.operations__tab--3 {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.operations__tab--4 {
  background: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%);
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

body.dark-mode .operations__tab--4 {
  background: linear-gradient(135deg, #a78bfa 0%, #7c3aed 100%);
  box-shadow: 0 4px 15px rgba(167, 139, 250, 0.3);
}

.operations__tab::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.6s ease;
}

.operations__tab:hover::before {
  left: 100%;
}

.operations__tab:hover,
.operations__tab:focus {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.operations__tab--active {
  transform: translateY(-6px) scale(1.05);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
  animation: tabPulse 2s ease-in-out infinite;
}

.operations__content {
  display: none;
  animation: contentSlideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.8),
    rgba(248, 250, 252, 0.8)
  );
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 1.5rem;
  padding: 3rem;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  position: relative;
  overflow: hidden;
}

body.dark-mode .operations__content {
  background: linear-gradient(
    135deg,
    rgba(30, 41, 59, 0.8),
    rgba(51, 65, 85, 0.8)
  );
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.operations__content--active {
  display: block;
}

.operations__content-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  text-align: center;
  position: relative;
  z-index: 2;
}

.operations__icon {
  width: 6rem;
  height: 6rem;
  stroke: #3b82f6;
  fill: none;
  stroke-width: 2;
  background: linear-gradient(135deg, #e5e7eb 0%, #f1f5f9 100%);
  border-radius: 50%;
  padding: 1.5rem;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  transition: all 0.3s ease;
  animation: iconFloat 3s ease-in-out infinite;
}

body.dark-mode .operations__icon {
  stroke: #60a5fa;
  fill: none;
  background: linear-gradient(135deg, #334155 0%, #475569 100%);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.operations__icon:hover {
  transform: scale(1.1) rotate(5deg);
  stroke-width: 2.5;
}

.operations__title {
  font-size: 2.6rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: #1f2a44;
  background: linear-gradient(135deg, #1f2a44 0%, #3b82f6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  z-index: 2;
  animation: titleGlow 3s ease-in-out infinite;
}

body.dark-mode .operations__title {
  background: linear-gradient(135deg, #e2e8f0 0%, #60a5fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.operations p {
  font-size: 1.8rem;
  line-height: 1.7;
  color: #6b7280;
  position: relative;
  z-index: 2;
  max-width: 60rem;
  margin: 0 auto;
}

body.dark-mode .operations p {
  color: #9ca3af;
}

/* ==========================================================================
     Card Stack Slider
     ========================================================================== */
.card-stack-container {
  max-width: 100rem;
  margin: 0 auto;
  position: relative;
  perspective: 1000px;
  height: 500px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.card-stack {
  position: relative;
  width: 100%;
  max-width: 400px;
  height: 400px;
  margin: 0 auto;
  transform-style: preserve-3d;
}

.card {
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border-radius: 2rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1), 0 8px 16px rgba(0, 0, 0, 0.06);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

body.dark-mode .card {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 8px 16px rgba(0, 0, 0, 0.2);
}

.card--1 {
  z-index: 3;
  transform: translateZ(0px) rotateY(0deg) scale(1);
}

.card--2 {
  z-index: 2;
  transform: translateZ(-20px) rotateY(-5deg) scale(0.95);
  opacity: 0.8;
}

.card--3 {
  z-index: 1;
  transform: translateZ(-40px) rotateY(-10deg) scale(0.9);
  opacity: 0.6;
}

.card.active {
  transform: translateZ(0px) rotateY(0deg) scale(1);
  z-index: 10;
  opacity: 1;
}

.card.prev {
  transform: translateZ(-20px) rotateY(5deg) scale(0.95);
  z-index: 2;
  opacity: 0.8;
}

.card.next {
  transform: translateZ(-20px) rotateY(-5deg) scale(0.95);
  z-index: 2;
  opacity: 0.8;
}

.card.hidden {
  transform: translateZ(-60px) rotateY(15deg) scale(0.85);
  z-index: 1;
  opacity: 0.4;
}

.card:hover {
  transform: translateZ(10px) rotateY(0deg) scale(1.02);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15), 0 12px 24px rgba(0, 0, 0, 0.1);
}

body.dark-mode .card:hover {
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4), 0 12px 24px rgba(0, 0, 0, 0.3);
}

.card__content {
  padding: 3rem;
  height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.card__avatar {
  width: 6rem;
  height: 6rem;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid #3b82f6;
  position: relative;
}

body.dark-mode .card__avatar {
  border-color: #60a5fa;
}

.card__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.card__rating {
  display: flex;
  gap: 0.3rem;
}

.star {
  color: #fbbf24;
  font-size: 1.8rem;
  transition: transform 0.2s ease;
}

.star:hover {
  transform: scale(1.2);
}

.card__title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: #1f2a44;
  line-height: 1.3;
}

body.dark-mode .card__title {
  color: #e2e8f0;
}

.card__text {
  font-size: 1.6rem;
  line-height: 1.6;
  color: #6b7280;
  margin-bottom: 2rem;
  flex-grow: 1;
}

body.dark-mode .card__text {
  color: #9ca3af;
}

.card__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.card__author {
  flex-grow: 1;
}

.card__name {
  font-size: 1.8rem;
  font-weight: 600;
  color: #1f2a44;
  margin-bottom: 0.5rem;
}

body.dark-mode .card__name {
  color: #e2e8f0;
}

.card__location {
  font-size: 1.4rem;
  color: #6b7280;
}

body.dark-mode .card__location {
  color: #9ca3af;
}

.card__quote-icon {
  font-size: 4rem;
  color: #3b82f6;
  opacity: 0.3;
  font-family: serif;
  line-height: 1;
}

body.dark-mode .card__quote-icon {
  color: #60a5fa;
}

.card-controls {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-top: 3rem;
  z-index: 10;
  position: relative;
}

.card-btn {
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, #3b82f6, #10b981);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

body.dark-mode .card-btn {
  background: linear-gradient(135deg, #60a5fa, #34d399);
  box-shadow: 0 4px 12px rgba(96, 165, 250, 0.3);
}

.card-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

body.dark-mode .card-btn:hover {
  box-shadow: 0 6px 20px rgba(96, 165, 250, 0.4);
}

.card-btn:active {
  transform: scale(0.95);
}

.card-btn svg {
  width: 2.4rem;
  height: 2.4rem;
  stroke-width: 2.5;
}

.card-indicators {
  display: flex;
  gap: 1.2rem;
  align-items: center;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2rem;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

body.dark-mode .card-indicators {
  background: rgba(0, 0, 0, 0.2);
  border-color: rgba(255, 255, 255, 0.1);
}

.indicator {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  border: 2px solid rgba(59, 130, 246, 0.3);
  background: transparent;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.indicator::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: linear-gradient(135deg, #3b82f6, #10b981);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body.dark-mode .indicator {
  border-color: rgba(96, 165, 250, 0.3);
}

.indicator:hover {
  transform: scale(1.3);
  border-color: #3b82f6;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

body.dark-mode .indicator:hover {
  border-color: #60a5fa;
  box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.2);
}

.indicator.active {
  border-color: #3b82f6;
  transform: scale(1.4);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.indicator.active::before {
  width: 100%;
  height: 100%;
}

body.dark-mode .indicator.active {
  border-color: #60a5fa;
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.3);
}

body.dark-mode .indicator.active::before {
  background: linear-gradient(135deg, #60a5fa, #34d399);
}

/* ==========================================================================
   Signup 
   ========================================================================== */
.section--signup {
  background: linear-gradient(135deg, #1e3a8a 0%, #374151 50%, #6d28d9 100%);
  padding: clamp(6rem, 8vw, 8rem) 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  color: var(--text-primary, #e2e8f0);
  z-index: 1;
  animation: fadeIn 0.8s ease-out forwards;
}

body.dark-mode .section--signup {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #4c1d95 100%);
}

/* Dynamic Background Layers */
.section--signup::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 80%,
      rgba(59, 130, 246, 0.25) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(16, 185, 129, 0.2) 0%,
      transparent 50%
    );
  z-index: -1;
  animation: backgroundShift 15s ease-in-out infinite;
}

body.dark-mode .section--signup::before {
  background: radial-gradient(
      circle at 20% 80%,
      rgba(96, 165, 250, 0.3) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(52, 211, 153, 0.25) 0%,
      transparent 50%
    );
}

.section--signup::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(
    from 0deg,
    transparent,
    rgba(255, 255, 255, 0.05),
    transparent
  );
  z-index: -2;
  animation: rotate 20s linear infinite;
}

/* Particle-like Effect for Dynamic Background */
.section--signup .particle {
  position: absolute;
  background: rgba(59, 130, 246, 0.3);
  border-radius: 50%;
  z-index: -1;
  animation: float 10s ease-in-out infinite;
}

.section--signup .particle:nth-child(1) {
  width: 20px;
  height: 20px;
  top: 10%;
  left: 15%;
  animation-delay: 0s;
}

.section--signup .particle:nth-child(2) {
  width: 15px;
  height: 15px;
  top: 70%;
  left: 80%;
  animation-delay: 2s;
}

.section--signup .particle:nth-child(3) {
  width: 25px;
  height: 25px;
  top: 50%;
  left: 30%;
  animation-delay: 4s;
}

body.dark-mode .particle {
  background: rgba(96, 165, 250, 0.35);
}

/* Keyframes for Dynamic Background */
@keyframes backgroundShift {
  0% {
    transform: translate(0, 0);
    opacity: 0.8;
  }
  50% {
    transform: translate(10%, 10%);
    opacity: 1;
  }
  100% {
    transform: translate(0, 0);
    opacity: 0.8;
  }
}

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

.signup-hero {
  max-width: 80rem;
  margin: 0 auto;
  padding: clamp(2.5rem, 4vw, 3rem);
  position: relative;
  z-index: 2;
}

.signup-hero__title {
  font-size: clamp(3rem, 4.5vw, 3.6rem);
  font-weight: 700;
  color: #e2e8f0;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  animation: slideUp 0.6s ease-out forwards;
}

body.dark-mode .signup-hero__title {
  color: #f1f5f9;
}

.signup-hero__subtitle {
  font-size: clamp(1.6rem, 2.5vw, 1.8rem);
  color: #9ca3af;
  margin-bottom: 2.5rem;
  line-height: 1.6;
  max-width: 90%;
  margin-left: auto;
  margin-right: auto;
  animation: slideUp 0.6s ease-out 0.2s forwards;
}

body.dark-mode .signup-hero__subtitle {
  color: #cbd5e1;
}

.signup-hero__cta {
  display: inline-block;
  padding: clamp(1.2rem, 1.5vw, 1.5rem) clamp(2.5rem, 3vw, 3rem);
  font-size: clamp(1.6rem, 2vw, 1.8rem);
  font-weight: 600;
  background: linear-gradient(135deg, #06b6d4, #8b5cf6);
  color: #ffffff;
  border-radius: 0.8rem;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  animation: slideUp 0.6s ease-out 0.4s forwards;
}

body.dark-mode .signup-hero__cta {
  background: linear-gradient(135deg, #22d3ee, #a78bfa);
}

.signup-hero__cta:hover {
  background: linear-gradient(135deg, #0891b2, #7c3aed);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

body.dark-mode .signup-hero__cta:hover {
  background: linear-gradient(135deg, #06b6d4, #8b5cf6);
}

/* Newsletter Styles */
.newsletter__form {
  max-width: 50rem;
  margin: 3rem auto 0;
  padding: clamp(1.8rem, 2.5vw, 2rem);
  background: rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  border: 1px solid rgba(59, 130, 246, 0.2);
  animation: slideUp 0.6s ease-out 0.6s forwards;
}

body.dark-mode .newsletter__form {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(96, 165, 250, 0.2);
}

.newsletter__title {
  font-size: clamp(2rem, 2.5vw, 2.2rem);
  font-weight: 600;
  color: #e2e8f0;
  margin-bottom: 1rem;
}

body.dark-mode .newsletter__title {
  color: #f1f5f9;
}

.newsletter__controls {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.newsletter__input {
  flex: 1;
  min-width: 20rem;
  padding: clamp(1.2rem, 1.5vw, 1.4rem);
  font-size: clamp(1.4rem, 1.8vw, 1.6rem);
  border-radius: 0.6rem;
  border: 1px solid rgba(59, 130, 246, 0.3);
  background: rgba(255, 255, 255, 0.15);
  color: #e2e8f0;
  outline: none;
  transition: all 0.3s ease;
}

body.dark-mode .newsletter__input {
  background: rgba(255, 255, 255, 0.1);
  color: #f1f5f9;
}

.newsletter__input::placeholder {
  color: #9ca3af;
}

.newsletter__input:focus {
  border-color: #06b6d4;
  box-shadow: 0 0 8px rgba(6, 182, 212, 0.3);
}

.newsletter__input--error {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
}

.newsletter__btn {
  padding: clamp(1.2rem, 1.5vw, 1.4rem) clamp(2rem, 2.5vw, 2.4rem);
  font-size: clamp(1.4rem, 1.8vw, 1.6rem);
  font-weight: 600;
  background: linear-gradient(135deg, #06b6d4, #8b5cf6);
  color: #ffffff;
  border: none;
  border-radius: 0.6rem;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}

body.dark-mode .newsletter__btn {
  background: linear-gradient(135deg, #22d3ee, #a78bfa);
}

.newsletter__btn:hover {
  background: linear-gradient(135deg, #0891b2, #7c3aed);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.4);
}

body.dark-mode .newsletter__btn:hover {
  background: linear-gradient(135deg, #06b6d4, #8b5cf6);
}

.newsletter__hint {
  font-size: clamp(1.3rem, 1.6vw, 1.4rem);
  color: #9ca3af;
  margin-top: 1rem;
  min-height: 2rem;
}

body.dark-mode .newsletter__hint {
  color: #cbd5e1;
}

.newsletter__hint--success {
  color: #10b981;
}

body.dark-mode .newsletter__hint--success {
  color: #34d399;
}

.newsletter__hint--error {
  color: #ef4444;
}
/* ==========================================================================
   footer 
   ========================================================================== */

.footer {
  background: linear-gradient(135deg, #1f2a44 0%, #374151 100%);
  color: #e2e8f0;
  padding: 5rem 0;
  text-align: center;
}

body.dark-mode .footer {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.footer__nav {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  list-style: none;
  margin-bottom: 3rem;
}

.footer__link {
  font-size: 1.6rem;
  color: #e2e8f0;
  text-decoration: none;
  transition: color 0.3s;
}

.footer__link:hover,
.footer__link:focus {
  color: #60a5fa;
}

.footer__logo {
  height: 3.5rem;
  margin: 2.5rem 0;
  transition: all 0.3s ease;
  filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(0%)
    hue-rotate(0deg) brightness(100%) contrast(100%);
}

.footer__logo:hover {
  transform: scale(1.05);
  filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(0%)
    hue-rotate(0deg) brightness(120%) contrast(120%);
}

.footer__copyright {
  font-size: 1.4rem;
  color: #9ca3af;
}

/* ==========================================================================
     Utilities
     ========================================================================== */
.toast {
  position: fixed;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  padding: 1.5rem 3rem;
  border-radius: 0.8rem;
  color: #ffffff;
  font-size: 1.6rem;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 9996;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  min-width: 30rem;
  text-align: center;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.success {
  background-color: #10b981;
}

.toast.error {
  background-color: #ef4444;
}

.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(59, 130, 246, 0.3);
  border-radius: 50%;
  animation: particleFloat 20s linear infinite;
}

.particle:nth-child(2n) {
  background: rgba(16, 185, 129, 0.3);
  animation-duration: 25s;
}

.particle:nth-child(3n) {
  background: rgba(139, 92, 246, 0.3);
  animation-duration: 30s;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
     Responsive Design
     ========================================================================== */

/* Large Desktop */
@media (min-width: 1200px) {
  .nav__content {
    padding: 2rem 4rem;
  }

  .container {
    padding: 0 4rem;
  }
}

/* Tablet Landscape */
@media (max-width: 1024px) {
  html {
    font-size: 60%;
  }

  .nav__content {
    padding: 1.8rem 2rem;
  }

  .header__title {
    font-size: 4.8rem;
  }

  .header__subtitle {
    font-size: 2.2rem;
  }

  .section__title {
    font-size: 3.6rem;
  }

  .operations {
    padding: 4rem;
  }

  .operations__tab-container {
    flex-wrap: wrap;
    gap: 1rem;
  }
}

/* Tablet Portrait */
@media (max-width: 768px) {
  html {
    font-size: 58%;
  }

  .container {
    padding: 0 2rem;
  }

  .nav__content {
    padding: 2rem;
    min-height: 8rem;
  }

  .nav__logo {
    height: 4rem;
  }

  .nav__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav__links {
    display: none;
    position: fixed;
    top: 8rem;
    left: 0;
    width: 100%;
    height: calc(100vh - 8rem);
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    gap: 3rem;
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  }

  body.dark-mode .nav__links {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  }

  .nav__links.active {
    display: flex;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    animation: slideDown 0.4s ease-out;
  }

  .nav__link {
    font-size: 2.2rem;
    font-weight: 600;
    padding: 1rem 2rem;
    border-radius: 0.8rem;
    transition: all 0.3s ease;
    text-align: center;
    min-width: 18rem;
    background: transparent;
    color: #1f2a44;
    animation: menuItemFade 0.5s ease-out forwards;
    animation-delay: calc(var(--index) * 0.1s);
  }

  body.dark-mode .nav__link {
    color: #e2e8f0;
    background: transparent;
  }

  .nav__link:hover,
  .nav__link:focus {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
    transform: scale(1.03);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
  }

  body.dark-mode .nav__link:hover,
  body.dark-mode .nav__link:focus {
    background: rgba(96, 165, 250, 0.1);
    color: #60a5fa;
    box-shadow: 0 2px 8px rgba(96, 165, 250, 0.15);
  }

  .nav__link--btn {
    background: linear-gradient(135deg, #3b82f6, #10b981);
    color: #ffffff;
    padding: 1.2rem 2.5rem;
    font-size: 2rem;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
    border-radius: 0.8rem;
    border: none;
  }

  body.dark-mode .nav__link--btn {
    background: linear-gradient(135deg, #60a5fa, #34d399);
  }

  .nav__link--btn:hover,
  .nav__link--btn:focus {
    background: linear-gradient(135deg, #2563eb, #059669);
    transform: scale(1.03);
    box-shadow: 0 6px 15px rgba(59, 130, 246, 0.3);
  }

  body.nav-open {
    overflow: hidden;
  }

  .header {
    padding-top: 10rem;
  }

  .header__content {
    padding: 3rem 2rem;
  }

  .header__title {
    font-size: 4.2rem;
    margin-bottom: 2.5rem;
  }

  .header__subtitle {
    font-size: 2rem;
    margin-bottom: 3.5rem;
  }

  .header__btns {
    flex-direction: column;
    gap: 1.5rem;
  }

  .section {
    padding: 6rem 0;
  }

  .section__title {
    font-size: 3.2rem;
    margin-bottom: 4rem;
  }

  .features {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .stats {
    flex-direction: column;
    gap: 3rem;
    align-items: center;
  }

  .stat {
    min-width: 25rem;
  }

  .operations {
    padding: 3rem 2rem;
    border-radius: 2rem;
  }

  .operations__tab-container {
    flex-direction: column;
    gap: 1.2rem;
  }

  .operations__tab {
    width: 100%;
    justify-content: center;
    padding: 1.8rem 2rem;
    font-size: 1.8rem;
  }

  .operations__content {
    padding: 2.5rem;
  }

  .operations__content-inner {
    gap: 1.8rem;
  }

  .operations__icon {
    width: 5rem;
    height: 5rem;
  }

  .card-stack-container {
    height: 450px;
  }

  .card-stack {
    max-width: 350px;
    height: 350px;
  }

  .card__content {
    padding: 2.5rem;
  }

  .card__avatar {
    width: 5rem;
    height: 5rem;
  }

  .card__title {
    font-size: 2rem;
  }

  .card__text {
    font-size: 1.5rem;
  }

  .card__name {
    font-size: 1.6rem;
  }

  .card__location {
    font-size: 1.3rem;
  }

  .newsletter__controls {
    flex-direction: column;
  }

  .newsletter__input {
    width: 100%;
  }
}

/* Mobile (under 500px) */
@media (max-width: 500px) {
  html {
    font-size: 55%;
  }

  .nav__content {
    padding: 1.5rem 1rem;
    min-height: 7rem;
  }

  .nav__logo {
    height: 3.8rem;
  }

  .nav__toggle {
    width: 4rem;
    height: 4rem;
    padding: 0.8rem;
  }

  .nav__toggle-icon {
    width: 2.2rem;
    height: 0.25rem;
  }

  .nav__toggle-icon::before {
    top: -0.7rem;
  }

  .nav__toggle-icon::after {
    top: 0.7rem;
  }

  .nav__links {
    top: 7rem;
    height: calc(100vh - 7rem);
    padding: 3rem 1.5rem;
    gap: 2.5rem;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  }

  body.dark-mode .nav__links {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  }

  .nav__links.active {
    animation: slideDown 0.4s ease-out;
  }

  .nav__link {
    font-size: 2rem;
    font-weight: 600;
    padding: 0.8rem 1.8rem;
    min-width: 16rem;
    border-radius: 0.6rem;
    background: transparent;
    color: #1f2a44;
    animation: menuItemFade 0.5s ease-out forwards;
    animation-delay: calc(var(--index) * 0.08s);
    touch-action: manipulation;
  }

  body.dark-mode .nav__link {
    color: #e2e8f0;
    background: transparent;
  }

  .nav__link:hover,
  .nav__link:focus {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
    transform: scale(1.03);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
  }

  body.dark-mode .nav__link:hover,
  body.dark-mode .nav__link:focus {
    background: rgba(96, 165, 250, 0.1);
    color: #60a5fa;
    box-shadow: 0 2px 8px rgba(96, 165, 250, 0.15);
  }

  .nav__link--btn {
    background: linear-gradient(135deg, #3b82f6, #10b981);
    color: #ffffff;
    padding: 1rem 2rem;
    font-size: 1.8rem;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
    border-radius: 0.6rem;
    border: none;
  }

  body.dark-mode .nav__link--btn {
    background: linear-gradient(135deg, #60a5fa, #34d399);
  }

  .nav__link--btn:hover,
  .nav__link--btn:focus {
    background: linear-gradient(135deg, #2563eb, #059669);
    transform: scale(1.03);
    box-shadow: 0 6px 15px rgba(59, 130, 246, 0.3);
  }

  .header {
    padding-top: 9rem;
    background-attachment: scroll;
  }

  .header__content {
    padding: 2rem 1.5rem;
  }

  .header__title {
    font-size: 3.6rem;
    margin-bottom: 2rem;
  }

  .header__subtitle {
    font-size: 1.8rem;
    margin-bottom: 3rem;
  }

  .header__btns {
    gap: 1.2rem;
  }

  .btn--primary,
  .btn--scroll-to {
    padding: 1.2rem 2rem;
    font-size: 1.8rem;
  }

  .section {
    padding: 5rem 0;
  }

  .section__title {
    font-size: 2.8rem;
    margin-bottom: 3.5rem;
  }

  .features {
    gap: 2rem;
  }

  .feature {
    padding: 2rem;
  }

  .feature__img {
    height: 150px;
  }

  .feature__title {
    font-size: 2rem;
  }

  .feature p {
    font-size: 1.5rem;
  }

  .stats {
    gap: 2.5rem;
  }

  .stat {
    min-width: 22rem;
    padding: 1.5rem;
  }

  .stat__number {
    font-size: 3.2rem;
  }

  .stat p {
    font-size: 1.5rem;
  }

  .operations {
    padding: 2.5rem 1.5rem;
    border-radius: 1.5rem;
  }

  .operations__tab-container {
    gap: 1rem;
  }

  .operations__tab {
    padding: 1.5rem 1.8rem;
    font-size: 1.6rem;
    min-height: 4rem;
  }

  .operations__tab-icon {
    width: 2rem;
    height: 2rem;
  }

  .operations__content {
    padding: 2rem;
  }

  .operations__icon {
    width: 4.5rem;
    height: 4.5rem;
    padding: 1rem;
  }

  .operations__title {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
  }

  .operations p {
    font-size: 1.6rem;
  }

  .card-stack-container {
    height: 400px;
  }

  .card-stack {
    max-width: 300px;
    height: 300px;
  }

  .card__content {
    padding: 2rem;
  }

  .card__avatar {
    width: 4.5rem;
    height: 4.5rem;
  }

  .card__title {
    font-size: 1.8rem;
  }

  .card__text {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
  }

  .card__name {
    font-size: 1.5rem;
  }

  .card__location {
    font-size: 1.2rem;
  }

  .card__quote-icon {
    font-size: 3.5rem;
  }

  .card-controls {
    gap: 1.5rem;
    margin-top: 2.5rem;
  }

  .card-btn {
    width: 4.5rem;
    height: 4.5rem;
  }

  .card-btn svg {
    width: 2rem;
    height: 2rem;
  }

  .card-indicators {
    gap: 1rem;
    padding: 0.4rem 0.8rem;
  }

  .indicator {
    width: 1rem;
    height: 1rem;
    border-width: 2.5px;
    transform: scale(1.2);
  }

  .indicator:hover {
    transform: scale(1.5);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
  }

  body.dark-mode .indicator:hover {
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.25);
  }

  .indicator.active {
    transform: scale(1.6);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.35);
  }

  body.dark-mode .indicator.active {
    box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.35);
  }

  .newsletter {
    padding: 2rem;
  }

  .newsletter__title {
    font-size: 2.2rem;
  }

  .newsletter__subtitle {
    font-size: 1.5rem;
  }

  .newsletter__input {
    padding: 1rem 1.4rem;
    font-size: 1.5rem;
  }

  .footer {
    padding: 4rem 0;
  }

  .footer__nav {
    flex-direction: column;
    gap: 1.5rem;
  }

  .footer__link {
    font-size: 1.5rem;
  }

  .footer__logo {
    height: 3rem;
  }

  .footer__copyright {
    font-size: 1.3rem;
  }

  .toast {
    min-width: 90%;
    padding: 1.2rem 2rem;
    font-size: 1.5rem;
  }
}