:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.07);
  --shadow-hover: 0 8px 28px rgba(0, 0, 0, 0.13);
  --radius: 14px;
  --transition: 0.2s ease;
  --accent: #546e7a;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Noto Sans JP", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

/* ---- Site Header ---- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.site-header .inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 18px 20px;
  display: flex;
  align-items: center;
}

.site-name {
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--text);
  letter-spacing: 0.02em;
}

/* ---- Hero ---- */
.hero {
  max-width: 920px;
  margin: 0 auto;
  padding: 60px 20px 48px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  line-height: 1.3;
}

.hero p {
  color: var(--muted);
  font-size: 0.975rem;
  max-width: 420px;
  margin: 0 auto;
}

/* ---- Apps Grid ---- */
.apps {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 20px 80px;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

/* ---- App Card ---- */
.app-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 24px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.app-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.app-card__icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  object-fit: cover;
}

.app-card__name {
  font-size: 1.05rem;
  font-weight: 700;
}

.app-card__desc {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.7;
  flex: 1;
}

.app-card__actions {
  display: flex;
  gap: 8px;
  width: 100%;
  margin-top: 6px;
}

.app-card__btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  text-decoration: none;
  color: #fff;
  background: var(--accent);
  transition: opacity var(--transition), transform var(--transition);
}

.app-card__btn:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.app-card__btn--disabled {
  background: var(--border);
  color: var(--muted);
  cursor: default;
  pointer-events: none;
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
}

@media (max-width: 540px) {
  .apps-grid {
    grid-template-columns: 1fr;
  }

  .app-card__actions {
    flex-direction: column;
  }
}