:root {
  --brand-primary: #69bff1;
  --brand-accent: #aadfed;
  --button-bg: #aadfed;
  --button-text: #6d6fb3;
  --bg-main: #7b7e99;
  --bg-light: #b4edf4;
  --text-main: #f9fcff;
  --text-muted: #e2e2f2;
}

body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
}

header, section, footer {
  padding: 4rem 2rem;
  max-width: 900px;
  margin: auto;
}

header {
  background: linear-gradient(120deg, var(--brand-accent), var(--bg-light));
  text-align: center;
  color: var(--brand-primary);
  border-bottom: 3px solid var(--brand-primary);
}

header {
  text-align: center;
  padding: 2rem 1rem;
}

header .logo {
  max-width: 250px;
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 1rem auto;
}

.build-process-image {
  display: block;
  margin: 2rem auto;
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}








h1, h2 {
  color: var(--brand-primary);
}

nav {
  background: var(--bg-light);
  padding: 1rem;
  text-align: center;
}

nav a {
  margin: 0 1rem;
  color: var(--brand-primary);
  text-decoration: none;
  font-weight: bold;
}

.section-title {
  margin-top: 0;
  border-bottom: 2px solid var(--brand-accent);
  padding-bottom: 0.5rem;
}

footer {
  font-size: 0.9rem;
  text-align: center;
  color: var(--text-muted);
  background-color: var(--bg-light);
}

.button {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--button-bg);
  color: var(--button-text);
  border-radius: 30px;
  font-weight: bold;
  text-decoration: none;
  border: 2px solid var(--button-text);
}

img, iframe {
  max-width: 100%;
  border-radius: 10px;
  margin-top: 1rem;
}



ul {
  padding-left: 1.5rem;
}

.bibliography-list {
  list-style: none;
  padding-left: 0;
  margin-top: 1rem;
}

.bibliography-list li {
  background-color: rgba(255, 255, 255, 0.05);
  border-left: 4px solid var(--brand-accent);
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  border-radius: 8px;
  color: var(--text-muted);
}

.site-footer {
  background-color: var(--bg-light);
  padding: 2rem 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: #1e90ff;
  border-top: 1px solid #ccc;
}

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

.footer-nav {
  margin: 1rem 0;
}

.footer-nav a,
.footer-note a {
  margin: 0 12px;
  color: #1e90ff;
  text-decoration: none;
}

.footer-nav a:hover,
.footer-note a:hover {
  text-decoration: underline;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
  max-width: 100%;
  margin: 2rem auto;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 12px;
}

@media (min-width: 768px) {
  .video-container {
    max-width: 900px;
  }
}

@media (min-width: 1200px) {
  .video-container {
    max-width: 1100px;
  }
}

#gallery {
  padding: 2rem;
  background-color: var(--bg-light, #f9f9f9);
  text-align: center;
}

#gallery .section-title {
  font-size: 2rem;
  color: var(--button-text, #333);
  margin-bottom: 1.5rem;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.image-grid img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.image-grid img:hover {
  transform: scale(1.03);
}