/* Palette Variables */
:root {
  --clr-bg: #FFF9FB;           /* Snow-ish (white) */
  --clr-primary: #220C10;      /* Licorice (dark) */
  --clr-accent: #C52233;       /* Cardinal (red) */
  --clr-highlight: #0353A4;    /* Sapphire (blue) */
  --clr-divider: rgba(0, 0, 0, 0.1); /* Divider light */
  --clr-tag-bg: rgba(0, 0, 0, 0.05); /* Light gray for tags */
}

/* Reset & Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: var(--clr-primary);
  background: var(--clr-bg);
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { max-width: 800px; margin: 0 auto; padding: 1rem; }

/* Navigation Header */
.nav-header {
  background: var(--clr-primary);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 999;
}
.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
}
.logo { font-weight: bold; font-size: 1.2rem; color: var(--clr-bg); }

/* Desktop menu */
.nav-container {
  display: flex;
  gap: 1rem;
}
.nav-container li { list-style: none; }
.nav-container a {
  color: var(--clr-bg);
  font-weight: bold;
}
.nav-container a:hover { color: var(--clr-accent); }

/* Toggle button */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--clr-bg);
  cursor: pointer;
}

/* Mobile */
@media (max-width: 600px) {
  .nav-toggle { display: block; }
  .nav-container {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--clr-primary);
    border-top: 1px solid var(--clr-highlight);
  }
  .nav-container.open { display: flex; }
  .nav-container a {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--clr-highlight);
  }
  .nav-container a:last-child { border-bottom: none; }
}

/* Profile Header */
header { display: flex; align-items: center; padding: 2rem 0; }
.profile { display: flex; align-items: center; }
.profile img { width: 100px; height: 100px; border-radius: 50%; margin-right: 1rem; }

/* About Tags */
.tags { margin-top: 1rem; }
.tag {
  display: inline-block;
  background: var(--clr-tag-bg);
  color: var(--clr-primary);
  padding: 0.25rem 0.6rem;
  margin: 0.25rem;
  border-radius: 4px;
  font-size: 0.9rem;
  border: 1px solid var(--clr-divider);
}

/* Sections */
section { padding: 2rem 0; border-bottom: 1px solid var(--clr-divider); }
section:last-child { border: none; }

/* Works filter tags */
.work-filters {
  margin-bottom: 1rem;
}
.filter-tag {
  display: inline-block;
  background: var(--clr-bg);
  border: 1px solid var(--clr-primary);
  color: var(--clr-primary);
  padding: 0.3rem 0.8rem;
  margin: 0.2rem;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}
.filter-tag:hover,
.filter-tag.active {
  background: var(--clr-primary);
  color: var(--clr-bg);
}

/* Cards */
.card {
  background: var(--clr-bg);
  padding: 1rem;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  color: var(--clr-primary);
}

/* Subthemes container */
.card-subthemes {
  margin-bottom: 0.5rem;
}

/* Subtheme tags colored by main theme */
.card[data-type="research"] .subtheme {
  background: var(--clr-accent);
  color: var(--clr-bg);
  padding: 0.2rem 0.6rem;
  margin-right: 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--clr-accent);
  font-size: 1rem;
}

.card[data-type="community"] .subtheme {
  background: var(--clr-primary);
  color: var(--clr-bg);
  padding: 0.2rem 0.6rem;
  margin-right: 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--clr-primary);
  font-size: 1rem;
}

.card[data-type="development"] .subtheme {
  background: var(--clr-highlight);
  color: var(--clr-bg);
  padding: 0.2rem 0.6rem;
  margin-right: 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--clr-highlight);
  font-size: 1rem;
}

/* カードタイトルとの間に余白 */
.card .card-title {
  margin-bottom: 0.25rem;
}

/* Tags inside cards */
.card .card-tags {
  margin-top: 0.5rem;
}
.card .card-tag {
  display: inline-block;
  background: var(--clr-tag-bg);
  color: var(--clr-primary);
  padding: 0.2rem 0.5rem;
  margin: 0.1rem;
  border-radius: 4px;
  font-size: 0.8rem;
  border: 1px solid var(--clr-divider);
}

/* Card links styled like tags, colored by main theme */
.card-links {
  margin: 0.5rem 0;
}
.card-links a {
  display: inline-block;
  margin: 0.1rem;
  padding: 0.3rem 0.6rem;
  background: var(--clr-primary); /* default fallback */
  color: var(--clr-bg);
  border-radius: 4px;
  text-decoration: none;
  font-size: 0.9rem;
  transition: background-color 0.2s;
}
/* research cards: link bg = red */
.card[data-type="research"] .card-links a {
  background: var(--clr-accent);
}
/* development cards: link bg = blue */
.card[data-type="development"] .card-links a {
  background: var(--clr-highlight);
}
.card-links a:hover {
  background: var(--clr-primary);
}

/* SNS Links */
.sns-list { display: flex; margin-top: 0.5rem; }
.sns-list li { margin-right: 1rem; }
.sns-list a { font-size: 1.5rem; color: var(--clr-primary); }
.sns-list a:hover { color: var(--clr-highlight); }