:root {
  --text: #0a1e30;
  --sub: #4a6d8a;
  --muted: #7fa8c0;
  --bg: #f0f5f9;
  --card: #ffffff;
  --border: #cfe0ec;
  --secondary: #e6f0f7;
  --info: #3b82f6;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Hiragino Kaku Gothic ProN", "Pretendard", "Malgun Gothic", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

.back-link {
  display: inline-block;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  margin-bottom: 16px;
}

.back-link:hover { color: var(--info); }

h1 {
  font-size: 28px;
  font-weight: 900;
  margin: 0 0 8px;
}

.effective {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 28px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 20px 22px;
  margin-bottom: 14px;
}

.card h2 {
  font-size: 17px;
  font-weight: 900;
  margin: 0 0 10px;
  color: var(--text);
}

.card p,
.card li {
  font-size: 14.5px;
  color: var(--sub);
  margin: 0 0 8px;
}

.card ul {
  margin: 8px 0;
  padding-left: 18px;
}

.card ul li {
  margin-bottom: 4px;
}

.card a {
  color: var(--info);
  text-decoration: none;
}

.card a:hover { text-decoration: underline; }

.info-card {
  background: rgba(59, 130, 246, 0.07);
  border-color: rgba(59, 130, 246, 0.25);
}

.info-card h2 {
  color: var(--info);
}

.warning-card {
  background: rgba(217, 119, 6, 0.07);
  border-color: rgba(217, 119, 6, 0.25);
}

.warning-card h2 {
  color: var(--warning);
}

.collection-box {
  background: var(--secondary);
  border-radius: 14px;
  padding: 16px;
  margin-top: 12px;
}

.collection-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 8px 0;
}

.collection-item + .collection-item {
  border-top: 1px solid var(--border);
}

.collection-item .icon {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: rgba(22, 163, 74, 0.13);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
}

.collection-item .title {
  font-size: 13.5px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 2px;
}

.collection-item .desc {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.55;
}

.footer {
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  margin-top: 40px;
}

.footer a {
  color: var(--info);
  text-decoration: none;
}

/* App index (landing) styles */
.app-grid {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.app-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.12s, border-color 0.12s;
}

.app-card:hover {
  transform: translateY(-1px);
  border-color: var(--info);
}

.app-card .name {
  font-size: 18px;
  font-weight: 900;
}

.app-card .desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.app-card .links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.app-card .links span {
  font-size: 12px;
  color: var(--info);
  background: rgba(59, 130, 246, 0.1);
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 700;
}

/* Doc landing inside each app folder */
.doc-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.doc-link {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 20px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 16px;
  transition: transform 0.1s, border-color 0.12s;
}

.doc-link:hover {
  transform: translateY(-1px);
  border-color: var(--info);
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e5edf5;
    --sub: #b3c5d6;
    --muted: #7090a8;
    --bg: #0a1928;
    --card: #102a40;
    --border: #1f3a55;
    --secondary: #15324a;
  }
}