/* ==========================================================================
   logo-grid.css - 브랜드 심볼(LOGO) 그리드 공용 스타일
   /symbol 페이지와 about.html(회사소개) 두 곳에서 함께 사용한다.
   테마 컬러: primary #4829B2 / dark #151515 / border #e5e5e5
   ========================================================================== */

:root {
  --logo-primary: #4829b2;
  --logo-dark: #151515;
  --logo-border: #e5e5e5;
  --logo-muted: #777;
}

/* --------------------------------------------------------------------------
   접이식 헤더 (about.html 처럼 기본 접힌 상태로 두고 싶을 때 사용)
   native <details> 기반이라 별도 스크립트가 필요 없다.
   -------------------------------------------------------------------------- */

.logo-collapse > summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.625rem;
  padding: 1rem 3rem 1rem 1.25rem;
  margin: 0;
  cursor: pointer;
  list-style: none;
  background: #fff;
  border: 1px solid var(--logo-border);
  transition: background-color 0.2s;
}

.logo-collapse > summary::-webkit-details-marker {
  display: none;
}

.logo-collapse > summary:hover {
  background-color: #fafafa;
}

.logo-collapse > summary:focus-visible {
  outline: 2px solid var(--logo-primary);
  outline-offset: -2px;
}

.logo-collapse > summary::after {
  content: "\f107"; /* fa-angle-down */
  position: absolute;
  top: 50%;
  right: 1.25rem;
  font-family: "Font Awesome 5 Free";
  font-weight: 900;
  color: var(--logo-muted);
  transform: translateY(-50%);
  transition: transform 0.2s;
}

.logo-collapse[open] > summary::after {
  transform: translateY(-50%) rotate(180deg);
}

.logo-collapse[open] > summary {
  border-bottom-color: transparent;
}

.logo-collapse-title {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.logo-collapse-hint {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--logo-muted);
}

.logo-collapse-body {
  padding: 1.5rem 1.25rem;
  background: #fff;
  border: 1px solid var(--logo-border);
  border-top: 0;
}

/* --------------------------------------------------------------------------
   미리보기 배경 전환 툴바
   -------------------------------------------------------------------------- */

.logo-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.logo-toolbar-label {
  margin-right: 0.25rem;
  font-size: 0.8125rem;
  color: var(--logo-muted);
}

.logo-bg-btn {
  padding: 0.375rem 0.875rem;
  font-size: 0.8125rem;
  color: var(--logo-dark);
  cursor: pointer;
  background: #fff;
  border: 1px solid var(--logo-border);
  transition: all 0.2s;
}

.logo-bg-btn:hover {
  border-color: var(--logo-primary);
}

.logo-bg-btn.is-active {
  color: #fff;
  background: var(--logo-primary);
  border-color: var(--logo-primary);
}

/* --------------------------------------------------------------------------
   브랜드별 그룹
   -------------------------------------------------------------------------- */

.logo-group + .logo-group {
  margin-top: 3rem;
}

.logo-group-title {
  margin-bottom: 0.25rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.logo-group-count {
  margin-left: 0.25rem;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--logo-muted);
  vertical-align: middle;
}

.logo-group-desc {
  margin-bottom: 1.25rem;
  font-size: 0.8125rem;
  color: var(--logo-muted);
}

/* --------------------------------------------------------------------------
   그리드와 카드
   -------------------------------------------------------------------------- */

.logo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 1.25rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

@media (max-width: 575.98px) {
  .logo-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.75rem;
  }
}

.logo-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--logo-border);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.logo-card:hover {
  border-color: #cfcfcf;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

/* 미리보기 배경 - 기본은 체커보드로 두어 투명 배경 심볼을 구분할 수 있게 한다. */
.logo-thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 140px;
  padding: 0.75rem;
  border-bottom: 1px solid var(--logo-border);
  background-color: #fff;
  background-image:
    linear-gradient(45deg, #ececec 25%, transparent 25%),
    linear-gradient(-45deg, #ececec 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #ececec 75%),
    linear-gradient(-45deg, transparent 75%, #ececec 75%);
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-size: 16px 16px;
}

.logo-thumb img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.logo-preview-light .logo-thumb {
  background-color: #fff;
  background-image: none;
}

.logo-preview-dark .logo-thumb {
  background-color: #151515;
  background-image: none;
}

/* 파일명이 두 줄까지 늘어나도 카드 높이와 버튼 위치가 어긋나지 않게 한다. */
.logo-name {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  min-height: calc(0.625rem + 0.6875rem * 1.4 * 2);
  padding: 0.625rem 0.75rem 0;
  margin: 0;
  overflow: hidden;
  font-size: 0.6875rem;
  line-height: 1.4;
  color: var(--logo-muted);
  word-break: break-all;
}

/* 원본 픽셀 크기 - 다운로드 버튼 바로 위에 표시한다. */
.logo-size {
  padding: 0.25rem 0.75rem 0;
  margin: 0;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--logo-dark);
  letter-spacing: 0.01em;
}

.logo-download {
  display: block;
  padding: 0.5rem 0.75rem;
  margin: 0.625rem 0.75rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: #fff;
  text-align: center;
  background: var(--logo-dark);
  transition: background-color 0.2s;
}

.logo-download:hover,
.logo-download:focus {
  color: #fff;
  text-decoration: none;
  background: var(--logo-primary);
}

.logo-download i {
  margin-right: 0.25rem;
}