:root {
  --clr-bg: #FFF9FB;           /* Snow-ish (white) */
  --clr-primary: #220C10;      /* Licorice (dark text) */
  --clr-accent: #C52233;       /* Cardinal (red for accents) */
  --clr-highlight: #0353A4;    /* Sapphire (blue for links/buttons) */
  --clr-divider: rgba(0, 0, 0, 0.1); /* Divider light */
  --clr-tag-bg: rgba(0, 0, 0, 0.05); /* Light gray for tags or subtle backgrounds */
  --clr-card-bg: #ffffff;      /* Card background - pure white or slightly off-white */
  --clr-card-shadow: rgba(0, 0, 0, 0.1);
  --clr-button-text: #ffffff;
}

body {
  font-family: 'Noto Sans JP', 'Roboto', sans-serif;
  background-color: var(--clr-bg);
  color: var(--clr-primary);
  margin: 0;
  padding: 0;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  text-align: center;
}

.page-wrapper {
  width: 100%;
  max-width: 900px;
  padding: 2rem 1rem;
  box-sizing: border-box;
}

header {
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2.5em;
  color: var(--clr-primary);
  margin-bottom: 0.5rem;
}

header .subtitle {
  font-size: 1.1em;
  color: #555; /* 少し濃いめのグレー */
  margin-bottom: 1.5rem;
}

.github-link-container {
  margin-top: 1rem;
}

.github-button {
  display: inline-block;
  background-color: var(--clr-highlight); /* Sapphire blue */
  color: var(--clr-button-text);
  padding: 0.75em 1.5em;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

.github-button:hover,
.github-button:focus {
  background-color: #024283; /* Darker Sapphire */
  transform: translateY(-2px);
  text-decoration: none;
}

.demo-container {
  background-color: var(--clr-card-bg);
  padding: 2rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  box-shadow: 0 4px 15px var(--clr-card-shadow);
  border: 1px solid var(--clr-divider); /* Subtle border */
}

.demo-container h2 {
  font-size: 1.8em;
  color: var(--clr-primary);
  margin-top: 0;
  margin-bottom: 1.5rem;
}

.prompt {
  font-weight: bold;
}

#imageCanvas {
  border: 1px solid var(--clr-divider);
  display: block;
  margin: 0 auto 1rem;
  width: 100%;
  max-width: 300px;
  aspect-ratio: 1 / 1;
  border-radius: 10px;
  background-color: var(--clr-tag-bg); /* Light gray for loading background */
}

.slider-container {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

#slider {
  width: 100%;
  margin-bottom: .5rem;
  -webkit-appearance: none;
  appearance: none;
  height: 8px;
  background: #e0e0e0; /* Light gray track */
  border-radius: 4px;
  outline: none;
}

#slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--clr-highlight); /* Sapphire blue */
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid var(--clr-card-bg); /* Card background for a slight pop */
  transition: background-color 0.2s ease;
}
#slider::-webkit-slider-thumb:hover {
  background-color: #024283; /* Darker Sapphire */
}

#slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--clr-highlight);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid var(--clr-card-bg);
}
#slider::-moz-range-thumb:hover {
  background-color: #024283;
}

.slider-label {
  font-size: 0.9em;
  color: #555;
}

footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--clr-divider);
  font-size: 0.9em;
  color: #777; /* Lighter gray for footer text */
}

footer p {
  margin: 0;
}

/* リンクの基本スタイル */
a {
  color: var(--clr-highlight); /* Sapphire blue */
  text-decoration: none;
}