:root {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #6c757d;
  --color-primary: #3a86ff;
  --color-primary-hover: #2667cc;
  --color-danger: #e63946;
  --color-danger-hover: #b82d38;
  --color-border: #dee2e6;
  --color-tag-bg: #e8eefb;
  --color-tag-text: #2667cc;
  --radius: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

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

body {
  margin: 0;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 1rem;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
}

.nav-links a:hover {
  color: var(--color-primary);
  background: var(--color-tag-bg);
}

/* Content */
.content {
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.page-header h2 {
  margin: 0;
  font-size: 1.5rem;
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 1rem;
  font-size: 1rem;
}

.detail-grid {
  display: grid;
  gap: 1rem;
}

/* Definition lists */
dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.4rem 1rem;
  margin: 0;
  font-size: 0.9rem;
}

dt {
  font-weight: 600;
  color: var(--color-text-secondary);
}

dd {
  margin: 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-bg);
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

/* Tables */
.file-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.file-table th,
.file-table td {
  padding: 0.6rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}

.file-table th {
  background: var(--color-bg);
  font-weight: 600;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.file-table a {
  color: var(--color-primary);
  text-decoration: none;
}

.file-table a:hover {
  text-decoration: underline;
}

/* File grid */
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1rem;
}

.file-card {
  position: relative;
}

.file-card .file-checkbox {
  position: absolute;
  top: 0.35rem;
  left: 0.35rem;
  z-index: 1;
  cursor: pointer;
}

.file-card-link {
  display: block;
  text-decoration: none;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.file-card-link:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow);
}

.file-card-thumb {
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  overflow: hidden;
}

.file-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-card-ext {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.file-card-name {
  padding: 0.4rem 0.5rem;
  font-size: 0.75rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Detail preview */
.detail-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  border-radius: var(--radius);
  overflow: hidden;
}

.detail-preview img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Select all label */
.select-all-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  cursor: pointer;
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.5rem;
  padding: 0.5rem 0;
}

.pagination-info {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  font-family: var(--font);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--color-bg);
  border-color: var(--color-text-secondary);
}

.btn-small {
  padding: 0.25rem 0.6rem;
  font-size: 0.8rem;
}

.btn-secondary {
  background: var(--color-bg);
}

.btn-danger {
  color: var(--color-danger);
  border-color: var(--color-danger);
}

.btn-danger:hover {
  background: var(--color-danger);
  color: white;
}

/* Tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
}

.tag-remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-tag-text);
  font-size: 1rem;
  line-height: 1;
  padding: 0;
  opacity: 0.6;
}

.tag-remove:hover {
  opacity: 1;
}

/* Tag management list */
.tag-management-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.tag-management-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

/* Forms */
.inline-form {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1.5rem;
}

.inline-form input,
.inline-form select {
  padding: 0.45rem 0.75rem;
  font-size: 0.875rem;
  font-family: var(--font);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.inline-form input:focus,
.inline-form select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: -1px;
}

/* Actions */
.actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Dashboard links */
.dashboard-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* Utilities */
.empty {
  color: var(--color-text-secondary);
  font-style: italic;
}

.error {
  color: var(--color-danger);
}

/* Login */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  width: 100%;
  max-width: 360px;
  box-shadow: var(--shadow);
}

.login-form h1 {
  margin: 0 0 1.5rem;
  font-size: 1.4rem;
  text-align: center;
}

.form-field {
  margin-bottom: 1rem;
}

.form-field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--color-text-secondary);
}

.form-field input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  font-family: var(--font);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.form-field input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: -1px;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

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

.btn-full {
  width: 100%;
  margin-top: 0.5rem;
}

/* Nav logout */
.nav-logout {
  margin-left: auto;
}

/* Checkbox column */
.col-checkbox {
  width: 2.5rem;
  text-align: center;
}

/* Batch action bar */
.batch-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.08);
  z-index: 100;
}

.batch-bar[hidden] {
  display: none;
}

.batch-bar span {
  font-size: 0.9rem;
  font-weight: 600;
}

.batch-actions {
  display: flex;
  gap: 0.5rem;
}

/* Batch dialog */
.batch-dialog {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
  padding: 0;
  min-width: 340px;
  max-width: 480px;
  font-family: var(--font);
}

.batch-dialog::backdrop {
  background: rgba(0, 0, 0, 0.3);
}

.batch-dialog h3 {
  margin: 0;
  padding: 1rem 1.25rem;
  font-size: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.dialog-body {
  padding: 1rem 1.25rem;
  max-height: 50vh;
  overflow-y: auto;
}

.dialog-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--color-border);
}

.checkbox-label {
  display: block;
  padding: 0.3rem 0;
  font-size: 0.9rem;
  cursor: pointer;
}

.checkbox-label input {
  margin-right: 0.4rem;
}

/* Drop zone */
.dropzone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.dropzone:hover {
  border-color: var(--color-primary);
  background: var(--color-tag-bg);
}

.dropzone.dragover {
  border-color: var(--color-primary);
  background: var(--color-tag-bg);
  color: var(--color-primary);
}

/* Upload list */
.upload-list {
  margin-top: 1rem;
}

.upload-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.upload-item-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.upload-item-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.upload-item-name a {
  color: var(--color-primary);
  text-decoration: none;
}

.upload-item-name a:hover {
  text-decoration: underline;
}

.upload-item-size {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  white-space: nowrap;
}

.upload-item-status {
  white-space: nowrap;
  font-size: 0.8rem;
}

.upload-item-status.pending {
  color: var(--color-text-secondary);
}

.upload-item-status.uploading {
  color: var(--color-primary);
}

.upload-item-status.done {
  color: #2d6a4f;
}

.upload-item-status.error {
  color: var(--color-danger);
}

/* Dialog form fields */
.batch-dialog .form-field select,
.batch-dialog .form-field input[type="text"],
.batch-dialog .form-field input[type="number"],
.batch-dialog .form-field input[type="date"] {
  width: 100%;
  padding: 0.45rem 0.75rem;
  font-size: 0.875rem;
  font-family: var(--font);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}