/* styles.css - Scrolling Presentation Style */
:root {
  --bg: #0f1724;
  --text: #f8fafc;
  --accent: #0ea5a4;
}

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

body {
  font-family: "Inter", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  scroll-behavior: smooth;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(15, 23, 36, 0.7);
  backdrop-filter: blur(6px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.topbar .brand {
  font-weight: 700;
  font-size: 1.1rem;
}

.topbar nav a {
  color: var(--text);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 6px;
}
.topbar nav a:hover {
  background: rgba(255,255,255,0.1);
}

/* Slides container */
#presentation {
  margin-top: 60px;
}

.slide {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: #000;
  transition: opacity 0.8s ease, transform 0.8s ease;
  opacity: 0;
  transform: translateY(40px);
}

.slide.visible {
  opacity: 1;
  transform: none;
}

.slide img {
  width: 100%;
  height: auto;
  max-height: 100vh;
  object-fit: contain;
  display: block;
}

/* Footer */
footer {
  background: rgba(15,23,36,0.8);
  text-align: center;
  padding: 50px 20px;
}

.footer-inner {
  max-width: 800px;
  margin: 0 auto;
}

.footer-inner a {
  color: var(--accent);
  text-decoration: none;
}

@media (max-width: 768px) {
  .topbar {
    height: 56px;
    padding: 0 15px;
  }

  .slide {
    min-height: calc(100dvh - 56px);
    padding: 10px;
  }

  .slide img {
    border-radius: 8px;
    max-width: 100%;
    height: auto;
  }
}