/* =========================================================
   공용 UI 컴포넌트 — 기능 페이지 전반에서 재사용
   (버튼 / 카드 / 페이지헤더 / 그리드 / 업로드 / 로더 / 탭 …)
   ========================================================= */

/* ----- 페이지 헤더 (제목 + 설명) ----- */
.page-head {
  margin-bottom: 24px;
}
.page-head h1 {
  margin: 0;
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.page-head p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

/* ----- 카드 ----- */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
}
.card + .card,
.card.mt {
  margin-top: 18px;
}
.card h3 {
  margin: 0 0 12px;
  font-size: 17px;
}

/* ----- 그리드 (12컬럼) ----- */
.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(12, 1fr);
  margin: 0 0 2rem;
}
.grid > .card {
  grid-column: span 12;
}
@media (min-width: 720px) {
  .span-3 {
    grid-column: span 3;
  }
  .span-4 {
    grid-column: span 4;
  }
  .span-6 {
    grid-column: span 6;
  }
  .span-8 {
    grid-column: span 8;
  }
}

/* ----- 버튼 ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--brand);
  color: #06120a;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 700;
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
  transition: var(--transition);
}
.btn:hover {
  background: var(--brand-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}
.btn:active {
  transform: translateY(0);
}
.btn.secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}
.btn.secondary:hover {
  background: var(--surface);
  border-color: var(--brand);
}
.btn.ghost {
  background: transparent;
  color: var(--muted);
}
.btn.ghost:hover {
  background: var(--surface);
  color: var(--fg);
}
.btn.block {
  width: 100%;
}
.btn.lg {
  padding: 14px 20px;
  font-size: 1.05rem;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* 버튼 묶음 */
.controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 12px 0;
}

/* ----- 복사 표시 박스 ----- */
.copy {
  border: 1px dashed var(--border);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  background: var(--surface);
}

/* ----- 키-값 목록 ----- */
.kvs {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 6px;
  font-size: 13px;
}

/* ----- 세그먼트 탭 (인코딩 방식, 카테고리 등) ----- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tab {
  padding: 9px 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  transition: var(--transition);
}
.tab:hover {
  border-color: var(--brand);
  color: var(--fg);
}
.tab.active {
  background: var(--brand);
  color: #06120a;
  border-color: var(--brand);
}

/* ----- 도구 대시보드 카드 (PDF 등) ----- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.tool-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
  transition: var(--transition);
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--brand);
}
.tool-icon {
  font-size: 2.4rem;
  color: var(--brand);
  margin-bottom: 14px;
  transition: var(--transition);
}
.tool-card:hover .tool-icon {
  transform: scale(1.1);
}
.tool-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.tool-desc {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.45;
}

/* ----- 업로드 / 드롭존 ----- */
.upload-area,
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  background: var(--surface);
  transition: var(--transition);
}
.upload-area:hover,
.upload-area.dragover,
.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--brand);
  background: var(--brand-soft);
}
.upload-area .upload-icon,
.drop-zone .upload-icon {
  font-size: 40px;
  margin-bottom: 10px;
  color: var(--brand);
}
.upload-area input[type="file"] {
  display: none;
}

/* ----- 로더 오버레이 (loader.js가 사용) ----- */
.loader-overlay {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}
.loader-overlay.active {
  opacity: 1;
  visibility: visible;
}
.spinner {
  width: 52px;
  height: 52px;
  border: 5px solid var(--border);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: ui-spin 1s linear infinite;
  margin-bottom: 18px;
}
.loader-text {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 6px;
}
.loader-subtext {
  font-size: 0.9rem;
  color: var(--muted);
}
@keyframes ui-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ----- 진행 바 ----- */
.progress-track {
  background: var(--surface-2);
  height: 14px;
  border-radius: 999px;
  overflow: hidden;
}
.progress-track > i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--brand), var(--brand-hover));
  transition: width 0.3s ease;
}

/* ----- 스크롤바 ----- */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
::-webkit-scrollbar {
  height: 8px;
  width: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--muted);
}