:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --panel-hover: #273449;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --radius: 16px;

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(900px 500px at 12% -10%, rgba(56, 189, 248, 0.16), transparent 60%),
    radial-gradient(700px 420px at 95% 105%, rgba(52, 211, 153, 0.1), transparent 60%), var(--bg);
  color: var(--text);
  font-family:
    system-ui,
    -apple-system,
    'Hiragino Kaku Gothic ProN',
    'Noto Sans JP',
    Meiryo,
    sans-serif;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 1040px;
  margin: 0 auto;
  padding: 64px 24px 48px;
  display: flex;
  flex-direction: column;
  gap: 40px;
  min-height: 100vh;
}

/* ---------- ヘッダ ---------- */

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.head h1 {
  margin: 0 0 12px;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  letter-spacing: -0.01em;
}

.lead {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

/* ---------- カード ---------- */

.grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
}

.placeholder {
  color: var(--muted);
  padding: 24px 4px;
}

.card {
  display: flex;
}

.card__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  padding: 22px 24px 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: inherit;
  text-decoration: none;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    transform 0.15s ease;
}

.card__link:hover,
.card__link:focus-visible {
  background: var(--panel-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.card__title {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.4;
}

/* 外部サービスのカードには行き先が別ドメインだと分かる印を付ける */
.card--external .card__title::after {
  content: '↗';
  margin-left: 0.4em;
  font-size: 0.85em;
  color: var(--accent);
}

.card__description {
  margin: 0;
  flex: 1;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

.card__tags {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.card__tags li {
  padding: 2px 9px;
  font-size: 0.6875rem;
  color: var(--muted);
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid var(--border);
  border-radius: 999px;
}

/* ---------- その他 ---------- */

.error {
  margin: 16px 0 0;
  padding: 14px 16px;
  color: #fecaca;
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.35);
  border-radius: 12px;
  font-size: 0.875rem;
}

@media (prefers-reduced-motion: reduce) {
  .card__link {
    transition: none;
  }

  .card__link:hover,
  .card__link:focus-visible {
    transform: none;
  }
}