/* うささぁの巣 - 共通デザイン */

:root {
  --bg: #1e222e;
  --surface: #252d3b;
  --surface-soft: #242c39;
  --text: #eef1f7;
  --muted: #b7bfcf;
  --accent: #85c9e5;
  --border: #303949;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "DM Sans", "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: 1120px;
  margin: auto;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 24px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

.page-heading {
  text-align: center;
  padding: 65px 20px 45px;
}

.page-heading h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 12px;
}

.page-heading p {
  color: var(--muted);
  font-size: 0.9rem;
}

.content {
  max-width: 1080px;
  margin: auto;
  padding: 0 24px 90px;
}

/* キャラクター一覧 */

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill,
      minmax(min(100%, 260px), 1fr));
  gap: 24px;
}

.model-card {
  display: block;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  transition: transform 0.2s, border-color 0.2s;
}

.model-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
}

.model-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  background: #202735;
}

.model-card-title {
  padding: 18px 20px;
  font-weight: 600;
}

/* 個別3Dビューアー */

.viewer-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
}

model-viewer {
  display: block;
  width: 100%;
  height: 68vh;
  min-height: 450px;
  background: radial-gradient(ellipse at 50% 45%,
      #444f61 0%,
      #323c4d 65%,
      #272c38 100%);
}

.model-info {
  padding: 23px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  border-top: 1px solid var(--border);
}

.controls {
  color: var(--muted);
  font-size: 0.8rem;
}

footer {
  border-top: 1px solid var(--border);
  padding: 35px 20px;
  text-align: center;
  color: #7f8ba0;
  font-size: 0.78rem;
}

@media (max-width: 650px) {
  .nav {
    flex-direction: column;
    padding: 20px 16px;
    gap: 18px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
  }

  .nav-links a {
    font-size: 0.72rem;
  }

  .content {
    padding: 0 16px 60px;
  }

  model-viewer {
    height: 58vh;
    min-height: 360px;
  }
}