* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-white: #ffffff;
  --color-off-white: #fafafa;
  --color-light-gray: #f5f5f5;
  --color-gray: #e5e5e5;
  --color-medium-gray: #737373;
  --color-dark-gray: #404040;
  --color-black: #171717;
  --color-accent: #0a0a0a;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--color-white);
  color: var(--color-black);
  overflow-x: hidden;
  line-height: 1.6;
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray);
}

.header-content {
  max-width: 1600px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--color-black);
}

.logo-icon {
  width: 2rem; /* adjust size to match the font */
  height: auto;
  margin-right: 0.25rem;
  vertical-align: middle;
}

.nav-indicator {
  font-size: 0.875rem;
  color: var(--color-medium-gray);
  font-weight: 400;
}

.nav-indicator span {
  color: var(--color-black);
  font-weight: 500;
}

/* Main Content */
main {
  margin-top: 73px;
  min-height: calc(100vh - 73px - 120px);
}

.slide-container {
  position: relative;
  width: 100%;
  height: calc(100vh - 73px - 120px);
  overflow: hidden;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  display: flex;
}

.slide.active {
  opacity: 1;
  pointer-events: auto;
}

.slide-image {
  flex: 1;
  position: relative;
  overflow: hidden;
  background-color: var(--color-light-gray);
}

.slide-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide.active .slide-image img {
  transform: scale(1);
}

.slide-content {
  flex: 1;
  padding: 4rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background-color: var(--color-white);
}

.slide-number {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-medium-gray);
  margin-bottom: 2rem;
}

.slide-title {
  font-size: 3rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  color: var(--color-black);
  line-height: 1.1;
}

.slide-description {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-dark-gray);
  font-weight: 300;
  margin-bottom: 2rem;
  max-width: 600px;
}

.slide-details {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 2rem;
}

.detail-item {
  font-size: 0.9375rem;
  color: var(--color-medium-gray);
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.detail-label {
  font-weight: 500;
  color: var(--color-black);
  min-width: 120px;
}

/* Navigation Controls */
.controls {
  position: fixed;
  bottom: 140px;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  z-index: 100;
}

.control-btn {
  width: 48px;
  height: 48px;
  border: 1px solid var(--color-gray);
  background-color: var(--color-white);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  font-size: 1.25rem;
  color: var(--color-black);
}

.control-btn:hover {
  background-color: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.control-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.control-btn:disabled:hover {
  background-color: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-gray);
}

/* Progress Indicators */
.progress-dots {
  position: fixed;
  bottom: 140px;
  left: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 100;
}

.progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-gray);
  cursor: pointer;
  transition: all 0.3s ease;
}

.progress-dot.active {
  background-color: var(--color-black);
  transform: scale(1.5);
}

.progress-dot:hover {
  background-color: var(--color-medium-gray);
}

/* Footer */
footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-top: 1px solid var(--color-gray);
  z-index: 1000;
}

.footer-content {
  max-width: 1600px;
  margin: 0 auto;
  padding: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-text {
  font-size: 0.875rem;
  color: var(--color-medium-gray);
  font-weight: 400;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--color-medium-gray);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-link:hover {
  color: var(--color-black);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .slide {
    flex-direction: column;
  }

  .slide-image,
  .slide-content {
    flex: none;
    width: 100%;
    height: 50%;
  }

  .slide-content {
    padding: 2rem;
    overflow-y: auto;
  }

  .slide-title {
    font-size: 2rem;
  }

  .slide-description {
    font-size: 1rem;
  }

  .controls {
    flex-direction: row;
    bottom: 140px;
    right: 50%;
    transform: translateX(50%);
  }

  .progress-dots {
    flex-direction: row;
    bottom: 200px;
    left: 50%;
    transform: translateX(-50%);
  }

  .courses-container {
    flex-direction: column;
    gap: 2rem;
  }

  .courses-image {
    min-height: 400px;
  }

  .courses-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 640px) {
  .header-content {
    padding: 1rem 1.5rem;
  }

  .logo {
    font-size: 1rem;
  }

  .nav-indicator {
    font-size: 0.75rem;
  }

  .slide-content {
    padding: 1.5rem;
  }

  .slide-title {
    font-size: 1.75rem;
  }

  .slide-description {
    font-size: 0.9375rem;
  }

  .footer-content {
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
    text-align: center;
  }

  .footer-links {
    gap: 1.5rem;
  }

  .control-btn {
    width: 40px;
    height: 40px;
  }

  .courses-section {
    padding: 2rem 0;
  }

  .courses-container {
    padding: 0 1.5rem;
  }

  .courses-image {
    min-height: 300px;
  }

  .courses-title {
    font-size: 2rem;
  }

  .courses-description {
    font-size: 1rem;
  }

  .courses-cta {
    width: 100%;
    justify-content: center;
  }
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Added courses section styles */
.courses-section {
  min-height: 100vh;
  background-color: var(--color-white);
  display: flex;
  align-items: center;
  padding: 4rem 0;
}

.courses-container {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  gap: 4rem;
  padding: 0 2rem;
}

.courses-image {
  flex: 1;
  position: relative;
  overflow: hidden;
  background-color: var(--color-light-gray);
  border-radius: 8px;
  min-height: 600px;
}

.courses-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.courses-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-medium-gray);
  margin-bottom: 1.5rem;
}

.courses-title {
  font-size: 3.5rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  color: var(--color-black);
  line-height: 1.1;
}

.courses-description {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-dark-gray);
  font-weight: 300;
  margin-bottom: 2.5rem;
  max-width: 600px;
}

.courses-features {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.feature-item {
  font-size: 0.9375rem;
  color: var(--color-medium-gray);
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.feature-label {
  font-weight: 500;
  color: var(--color-black);
  min-width: 120px;
}

.courses-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  background-color: var(--color-black);
  color: var(--color-white);
  text-decoration: none;
  border-radius: 4px;
  font-weight: 500;
  font-size: 0.9375rem;
  transition: all 0.3s ease;
  align-self: flex-start;
}

.courses-cta:hover {
  background-color: var(--color-dark-gray);
  transform: translateX(4px);
}