:root {
  --bg-color: #fcfcfc;
  --text-color: #2c3e50;
  --accent-color: #1a73e9;
  --accent-hover: #1669c1;
  --border-color: #e2e8f0;
  --warning-bg: #fffbeb;
  --warning-border: #f59e0b;
  --warning-text: #92400e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #151513;
    --text-color: #e2e8f0;
    --accent-color: #611c99;
    --accent-hover: #6e16c1;
    --border-color: #334155;
    --warning-bg: #45290a;
    --warning-border: #d97706;
    --warning-text: #fde68a;
  }
}

body {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  font-family:
    system-ui,
    -apple-system,
    sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
}
a:hover {
  text-decoration: underline;
}

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: 3rem;
  padding-top: 2rem;
}
.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}
.subtitle {
  font-size: 1.2rem;
  opacity: 0.8;
  margin-bottom: 1.5rem;
}
.btn-primary {
  display: inline-block;
  background-color: var(--accent-color);
  color: #fff !important;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: bold;
  text-decoration: none !important;
  transition: background-color 0.2s;
}
.btn-primary:hover {
  background-color: var(--accent-hover);
}

.interactive-area {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
}
@media (min-width: 768px) {
  .interactive-area {
    flex-direction: row;
  }
}

/* Callouts */
.callout {
  padding: 1rem;
  border-radius: 6px;
  border-left: 4px solid var(--border-color);
  margin-bottom: 1.5rem;
}
.warning {
  background-color: var(--warning-bg);
  border-left-color: var(--warning-border);
  color: var(--warning-text);
  font-size: 0.95rem;
}

hr {
  border: 0;
  height: 1px;
  background: var(--border-color);
  margin: 3rem 0;
}

/* Video Grid */
.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}
@media (min-width: 600px) {
  .video-grid {
    grid-template-columns: 1fr 1fr;
  }
}
.video-grid iframe {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  color: var(--text-color);
  opacity: 0.8;
}
.social-links {
  display: flex;
  gap: 1rem;
  font-size: 1.5rem;
}

/* github corner */
.github-corner {
  display: block;
  position: absolute;
  top: 0;
  border: 0;
  right: 0;
}
.github-corner:hover .octo-arm {
  animation: octocat-wave 560ms ease-in-out;
}
@keyframes octocat-wave {
  0%,
  100% {
    transform: rotate(0);
  }
  20%,
  60% {
    transform: rotate(-25deg);
  }
  40%,
  80% {
    transform: rotate(10deg);
  }
}
@media (max-width: 500px) {
  .github-corner:hover .octo-arm {
    animation: none;
  }
  .github-corner .octo-arm {
    animation: octocat-wave 560ms ease-in-out;
  }
}
@media (prefers-color-scheme: dark) {
  .github-corner {
    filter: invert(1);
  }
}

/* tweakpane */
:root {
  --tp-base-background-color: hsla(230, 5%, 90%, 1);
  --tp-base-shadow-color: hsla(0, 0%, 0%, 0.1);
  --tp-button-background-color: hsla(230, 7%, 75%, 1);
  --tp-button-background-color-active: hsla(230, 7%, 60%, 1);
  --tp-button-background-color-focus: hsla(230, 7%, 65%, 1);
  --tp-button-background-color-hover: hsla(230, 7%, 70%, 1);
  --tp-button-foreground-color: hsla(230, 10%, 30%, 1);
  --tp-container-background-color: hsla(230, 15%, 30%, 0.2);
  --tp-container-background-color-active: hsla(230, 15%, 30%, 0.32);
  --tp-container-background-color-focus: hsla(230, 15%, 30%, 0.28);
  --tp-container-background-color-hover: hsla(230, 15%, 30%, 0.24);
  --tp-container-foreground-color: hsla(230, 10%, 30%, 1);
  --tp-groove-foreground-color: hsla(230, 15%, 30%, 0.1);
  --tp-input-background-color: hsla(230, 15%, 30%, 0.1);
  --tp-input-background-color-active: hsla(230, 15%, 30%, 0.22);
  --tp-input-background-color-focus: hsla(230, 15%, 30%, 0.18);
  --tp-input-background-color-hover: hsla(230, 15%, 30%, 0.14);
  --tp-input-foreground-color: hsla(230, 10%, 30%, 1);
  --tp-label-foreground-color: hsla(230, 10%, 30%, 0.7);
  --tp-monitor-background-color: hsla(230, 15%, 30%, 0.1);
  --tp-monitor-foreground-color: hsla(230, 10%, 30%, 0.5);
  --tp-base-font-family: system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --tp-base-background-color: hsla(0, 0%, 0%, 1);
    --tp-base-shadow-color: hsla(0, 0%, 0%, 0.2);
    --tp-button-background-color: hsla(0, 0%, 70%, 1);
    --tp-button-background-color-active: hsla(0, 0%, 85%, 1);
    --tp-button-background-color-focus: hsla(0, 0%, 80%, 1);
    --tp-button-background-color-hover: hsla(0, 0%, 75%, 1);
    --tp-button-foreground-color: hsla(0, 0%, 0%, 1);
    --tp-container-background-color: hsla(0, 0%, 10%, 1);
    --tp-container-background-color-active: hsla(0, 0%, 25%, 1);
    --tp-container-background-color-focus: hsla(0, 0%, 20%, 1);
    --tp-container-background-color-hover: hsla(0, 0%, 15%, 1);
    --tp-container-foreground-color: hsla(0, 0%, 50%, 1);
    --tp-groove-foreground-color: hsla(0, 0%, 10%, 1);
    --tp-input-background-color: hsla(0, 0%, 10%, 1);
    --tp-input-background-color-active: hsla(0, 0%, 25%, 1);
    --tp-input-background-color-focus: hsla(0, 0%, 20%, 1);
    --tp-input-background-color-hover: hsla(0, 0%, 15%, 1);
    --tp-input-foreground-color: hsla(0, 0%, 70%, 1);
    --tp-label-foreground-color: hsla(0, 0%, 50%, 1);
    --tp-monitor-background-color: hsla(0, 0%, 8%, 1);
    --tp-monitor-foreground-color: hsla(0, 0%, 48%, 1);
  }
}