/* ===== Shared components (main page + share pages) ===== */

/* Lang toggle button — all pages */
.btn-lang {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #fff;
  border: none;
  cursor: pointer;
  padding: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #6b7280;
  transition: color .15s, background .15s;
  flex-shrink: 0;
}

.btn-lang:hover {
  color: #0066ff;
  background: #f0f4ff;
}

.lang-icon {
  width: 22px;
  height: 22px;
  display: block;
}

/* Page-level fixed positioning (login + share pages) */
.btn-lang-fixed {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1001;
}

/* ===== Preview Modal ===== */
.preview-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .5);
  z-index: 600;
  display: none;
  align-items: center;
  justify-content: center;
}

.preview-overlay.visible {
  display: flex;
}

.preview-container {
  background: #fff;
  border-radius: 12px;
  width: 90vw;
  height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 40px rgba(0, 0, 0, .2);
  overflow: hidden;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  border-bottom: 1px solid #e8e8e8;
  flex-shrink: 0;
  gap: 12px;
}

.preview-title {
  font-size: 14px;
  font-weight: 500;
  color: #333;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.preview-header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.preview-charset-group {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: #888;
}

.preview-charset {
  font-size: 12px;
  padding: 3px 6px;
  border: 1px solid #d0d0d0;
  border-radius: 4px;
  background: #fff;
  color: #555;
  cursor: pointer;
  outline: none;
}

.preview-charset:focus {
  border-color: #0066ff;
}

.preview-close {
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  font-size: 20px;
  cursor: pointer;
  color: #999;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: color .15s, background .15s;
  line-height: 1;
}

.preview-close:hover {
  color: #e00;
  background: #fef2f2;
}

.preview-body {
  flex: 1;
  min-height: 0;
}

.preview-body iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.preview-pdf-container {
  width: 100%;
  height: 100%;
  overflow: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px;
  background: #525659;
}

.pdf-page-canvas {
  box-shadow: 0 2px 12px rgba(0, 0, 0, .5);
  max-width: 100%;
  height: auto;
}

.preview-office-container {
  width: 100%;
  height: 100%;
  overflow: auto;
  padding: 24px 32px;
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.7;
  color: #333;
}

.preview-office-container table {
  border-collapse: collapse;
  width: auto;
  font-size: 13px;
  margin-bottom: 16px;
}

.preview-office-container td,
.preview-office-container th {
  border: 1px solid #d0d0d0;
  padding: 4px 10px;
  min-width: 56px;
}

.preview-office-container th {
  background: #f5f5f5;
  font-weight: 600;
}

.xlsx-sheet h3 {
  margin: 20px 0 8px;
  font-size: 15px;
  color: #555;
}

.xlsx-sheet:first-child h3 {
  margin-top: 0;
}

.preview-loading,
.preview-error {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-size: 16px;
  color: #aaa;
}

.preview-loading::before {
  content: '';
  width: 36px;
  height: 36px;
  border: 3px solid #e0e0e0;
  border-top-color: #0066ff;
  border-radius: 50%;
  animation: preview-spin .7s linear infinite;
  margin-right: 12px;
  flex-shrink: 0;
}

@keyframes preview-spin {
  to { transform: rotate(360deg); }
}

.preview-error {
  color: #e74c3c;
}