:root {
  --color-bg: #ffffff;
  --color-surface: #f7f8fa;
  --color-border: #e2e5ea;
  --color-text: #1a1d23;
  --color-text-muted: #5b6270;
  --color-primary: #1f5eff;
  --color-primary-text: #ffffff;
  --color-badge-public-bg: #e6f6ec;
  --color-badge-public-text: #1a7a41;
  --color-badge-partner-bg: #fff4e5;
  --color-badge-partner-text: #9a5b00;
  --font-base: "Hiragino Sans", "Meiryo", system-ui, sans-serif;
  --radius: 10px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14161a;
    --color-surface: #1c1f25;
    --color-border: #2b2f37;
    --color-text: #eceef1;
    --color-text-muted: #a2a8b4;
    --color-primary: #5b8cff;
    --color-primary-text: #0c0f14;
    --color-badge-public-bg: #123420;
    --color-badge-public-text: #7fe0a0;
    --color-badge-partner-bg: #3a2a10;
    --color-badge-partner-text: #f0b458;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-base);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.site-header .brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.site-header nav a.active {
  color: var(--color-text);
  font-weight: 700;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-3);
}

.hero h1 {
  font-size: 2rem;
  margin-bottom: var(--space-2);
}

.hero p {
  color: var(--color-text-muted);
  max-width: 640px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.category-card {
  display: block;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  transition: border-color 0.15s ease;
}

.category-card:hover {
  border-color: var(--color-primary);
}

.category-card h2 {
  margin: 0 0 var(--space-1);
  font-size: 1.05rem;
  color: var(--color-text);
}

.category-card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.resource-list {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.resource-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  flex-wrap: wrap;
}

.resource-title {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.resource-desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

.resource-meta {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-top: 4px;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
}

.badge-public {
  background: var(--color-badge-public-bg);
  color: var(--color-badge-public-text);
}

.badge-partner {
  background: var(--color-badge-partner-bg);
  color: var(--color-badge-partner-text);
}

.btn-download {
  display: inline-block;
  padding: 8px 18px;
  border-radius: var(--radius);
  background: var(--color-primary);
  color: var(--color-primary-text);
  font-weight: 600;
  white-space: nowrap;
}

.access-note,
.empty-state {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-top: var(--space-3);
}

.site-footer {
  padding: var(--space-3);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

.login-form {
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.login-form label {
  font-weight: 600;
}

.login-form input[type="password"] {
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
}

.login-form .btn-download {
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.login-error {
  color: #c0392b;
  font-size: 0.9rem;
  margin: 0;
}