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

body {
  margin: 0;
  font-family: 'Segoe UI', 'Noto Sans KR', sans-serif;
  background: #f0f2f5;
  color: #222;
}

.wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}

h1 {
  margin: 0 0 4px;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

h2 {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 500;
  color: #777;
}

.meta {
  margin: 6px 0 28px;
  color: #aaa;
  font-size: 12px;
}

/* ─── Grid (통합·UIUX 인덱스용) ─── */

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
}

/* ─── Card ─── */

.card {
  background: #fff;
  border: 1px solid #dde1e9;
  border-radius: 12px;
  overflow: hidden;
}

/* Card 내 단순 ul (통합·UIUX 인덱스) */
.card > ul {
  margin: 0;
  padding: 12px 18px 14px 36px;
  max-height: 70vh;
  overflow: auto;
}

.card > h2 {
  margin: 0;
  padding: 14px 18px;
}

/* ─── 1뎁스 details (카테고리) ─── */

.card > details {
  border-top: 1px solid #eaecf0;
}

.card > details:first-child {
  border-top: none;
}

.card > details > summary {
  padding: 13px 18px;
  font-size: 14px;
  font-weight: 700;
  color: #1a1a1a;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
  transition: background 0.1s;
}

.card > details > summary:hover {
  background: #f5f7fa;
}

.card > details > summary::before {
  content: '▶';
  font-size: 8px;
  color: #bdc2cc;
  flex-shrink: 0;
  transition: transform 0.15s;
}

.card > details[open] > summary::before {
  transform: rotate(90deg);
}

/* 1뎁스 details 내 flat ul (_templates 등) */
.card > details > ul {
  margin: 0 0 10px;
  padding: 0 18px 0 40px;
  list-style: none;
}

.card > details > ul > li {
  margin: 0 0 5px;
  font-size: 13px;
  line-height: 1.4;
}

/* ─── 2뎁스 details (서브그룹: 2603, 신규회원혜택 등) ─── */

.card > details > details {
  margin: 0 14px 10px 28px;
  background: #f2f5fb;
  border: 1px solid #d8dfe9;
  border-left: 3px solid #8fa8c8;
  border-radius: 8px;
  overflow: hidden;
}

.card > details > details > summary {
  padding: 9px 12px;
  font-size: 13px;
  font-weight: 700;
  color: #3a4a60;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
  user-select: none;
  transition: background 0.1s;
}

.card > details > details > summary:hover {
  background: #e5eaf4;
}

.card > details > details > summary::before {
  content: '▶';
  font-size: 7px;
  color: #9aafc8;
  flex-shrink: 0;
  transition: transform 0.15s;
}

.card > details > details[open] > summary::before {
  transform: rotate(90deg);
}

.card > details > details > ul {
  margin: 0;
  padding: 2px 12px 10px 28px;
}

.card > details > details > ul > li {
  margin: 0 0 5px;
  font-size: 13px;
  line-height: 1.4;
}

/* ─── 3뎁스 details (d2 항목: index.html 전용) ─── */

.card > details > details > details {
  margin: 0 10px 6px 14px;
  background: #fff;
  border: 1px solid #dce2ec;
  border-left: 2px solid #b0c4d8;
  border-radius: 6px;
  overflow: hidden;
}

.card > details > details > details > summary {
  padding: 7px 11px;
  font-size: 12px;
  font-weight: 600;
  color: #556070;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 5px;
  user-select: none;
  transition: background 0.1s;
}

.card > details > details > details > summary:hover {
  background: #eef2f8;
}

.card > details > details > details > summary::before {
  content: '▶';
  font-size: 6px;
  color: #b8c8d8;
  flex-shrink: 0;
  transition: transform 0.15s;
}

.card > details > details > details[open] > summary::before {
  transform: rotate(90deg);
}

.card > details > details > details > ul {
  margin: 0;
  padding: 2px 12px 8px 26px;
}

.card > details > details > details > ul > li {
  margin: 0 0 4px;
  font-size: 12px;
  line-height: 1.4;
}

/* ─── Links ─── */

a {
  color: #1a6fc4;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: #0e4fa0;
}

/* ─── Misc ─── */

li {
  line-height: 1.4;
}

.empty {
  color: #bbb;
  font-size: 12px;
}