.upload-page { max-width: 680px; margin: 0 auto; padding: 24px 16px 48px; }
.upload-section { background: var(--md-surface-container-low); border: 1px solid var(--md-outline-variant); border-radius: 16px; padding: 20px; margin-bottom: 16px; }
.upload-section-header { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.upload-section-header .material-symbols-outlined { font-size: 22px; color: var(--md-primary); }
.upload-section-header h2 { font-size: 1.125rem; font-weight: 600; margin: 0; color: var(--md-on-surface); }
.upload-field { margin-bottom: 16px; }
.upload-field:last-child { margin-bottom: 0; }
.upload-row { display: flex; gap: 12px; }
.upload-field-half { flex: 1; }
.upload-hint { font-size: 0.8125rem; color: var(--md-on-surface-variant); margin-top: 4px; }
.upload-errors { background: color-mix(10%, var(--md-error), transparent); border: 1px solid var(--md-error); border-radius: 12px; padding: 12px 16px; margin-bottom: 16px; }
.upload-error-item { color: var(--md-error); font-size: 0.875rem; margin-bottom: 4px; }
.upload-error-item:last-child { margin-bottom: 0; }
.upload-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 16px; margin-top: 16px; }
.upload-note { display: flex; align-items: flex-start; gap: 8px; font-size: 0.8125rem; color: var(--md-on-surface-variant); flex: 1; min-width: 200px; }
.upload-note .material-symbols-outlined { font-size: 18px; margin-top: 1px; }
.upload-alt { text-align: center; margin-top: 24px; padding: 16px; font-size: 0.9375rem; color: var(--md-on-surface-variant); }
.upload-alt a { color: var(--md-primary); text-decoration: none; font-weight: 500; }
.upload-alt a:hover { text-decoration: underline; }

/* Collapsible details */
.upload-details { background: var(--md-surface-container-low); border: 1px solid var(--md-outline-variant); border-radius: 16px; margin-bottom: 16px; overflow: hidden; }
.upload-details[open] { border-color: var(--md-primary-container); }
.upload-details-summary { display: flex; align-items: center; gap: 10px; padding: 16px 20px; cursor: pointer; font-size: 1.125rem; font-weight: 600; color: var(--md-on-surface); list-style: none; }
.upload-details-summary::-webkit-details-marker { display: none; }
.upload-details-summary::after { content: ''; margin-left: auto; border: solid var(--md-on-surface-variant); border-width: 0 2px 2px 0; padding: 3px; transform: rotate(45deg); transition: transform 0.2s; }
.upload-details[open] .upload-details-summary::after { transform: rotate(-135deg); }
.upload-details-summary .material-symbols-outlined { font-size: 22px; color: var(--md-primary); }
.upload-details-badge { font-size: 0.6875rem; font-weight: 500; background: var(--md-primary-container); color: var(--md-on-primary-container); padding: 2px 8px; border-radius: 8px; margin-left: 8px; text-transform: uppercase; letter-spacing: 0.03em; }
.upload-details-content { padding: 0 20px 20px; }

/* Dropzone */
.upload-dropzone {
  border: 2px dashed var(--md-outline-variant);
  border-radius: 16px;
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
}
.upload-dropzone:hover, .upload-dropzone.dragover {
  border-color: var(--md-primary);
  background: color-mix(5%, var(--md-primary), transparent);
}
.upload-dropzone.has-file {
  border-color: var(--md-primary);
  border-style: solid;
  background: color-mix(5%, var(--md-primary), transparent);
  padding: 20px;
  cursor: default;
}
.upload-file-input {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}
.upload-dropzone-icon { font-size: 48px; color: var(--md-primary); display: block; margin: 0 auto 8px; }
.upload-dropzone-text { margin: 0; color: var(--md-on-surface-variant); font-size: 0.9375rem; }
.upload-browse-link { color: var(--md-primary); font-weight: 600; cursor: pointer; text-decoration: underline; }
.upload-dropzone-hint { margin: 4px 0 0; font-size: 0.8125rem; color: var(--md-on-surface-variant); opacity: 0.7; }

/* Files list for multiple uploads */
.upload-files-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}
.upload-file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--md-surface-container-high);
  border: 1px solid var(--md-outline-variant);
  border-radius: 12px;
  padding: 12px 16px;
  min-width: 0; /* Critical for ellipsis */
  cursor: default;
}
.upload-file-icon {
  font-size: 28px;
  color: var(--md-primary);
  flex-shrink: 0;
}
.upload-file-info {
  flex: 1;
  text-align: left;
  min-width: 0; /* Critical for ellipsis */
}
.upload-file-name {
  display: block;
  font-weight: 600;
  color: var(--md-on-surface);
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.upload-file-size {
  display: block;
  font-size: 0.75rem;
  color: var(--md-on-surface-variant);
  margin-top: 2px;
}
.upload-file-remove {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  color: var(--md-on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s, color 0.2s;
  position: relative;
  z-index: 3;
}
.upload-file-remove:hover {
  background: color-mix(10%, var(--md-error), transparent);
  color: var(--md-error);
}
.upload-file-remove .material-symbols-outlined { font-size: 20px; }

/* Divider */
.upload-divider { display: flex; align-items: center; gap: 12px; margin: 12px 0 16px; color: var(--md-on-surface-variant); font-size: 0.8125rem; }
.upload-divider::before, .upload-divider::after { content: ''; flex: 1; height: 1px; background: var(--md-outline-variant); }

/* Subject chips */
.subject-chips-area { display: flex; flex-direction: column; gap: 8px; }
.subject-chips { display: flex; flex-wrap: wrap; gap: 6px; min-height: 0; }
.subject-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  padding: 4px 8px 4px 12px;
  border-radius: 20px;
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.4;
}
.subject-chip-remove {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--md-on-primary-container);
  opacity: 0.7;
  border-radius: 50%;
  width: 18px;
  height: 18px;
}
.subject-chip-remove:hover { opacity: 1; background: color-mix(15%, var(--md-on-primary-container), transparent); }
.subject-chip-remove .material-symbols-outlined { font-size: 14px; }
.subject-input-row { display: flex; gap: 8px; }
.subject-input-row .md-input { flex: 1; }
.subject-pick-btn { white-space: nowrap; padding: 8px 16px; }
.subject-pick-btn .material-symbols-outlined { font-size: 18px; }

@media (max-width: 600px) {
  .upload-row { flex-direction: column; gap: 0; }
  .upload-dropzone { padding: 24px 16px; }
  .upload-details-content { padding: 0 16px 16px; }
}

/* Upload progress overlay */
.upload-progress-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.upload-progress-dialog {
  background: var(--md-surface-container-low);
  border-radius: 24px;
  padding: 32px 28px;
  max-width: 380px;
  width: 100%;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.24);
}
.upload-progress-icon {
  margin-bottom: 16px;
}
.upload-progress-icon .material-symbols-outlined {
  font-size: 48px;
  color: var(--md-primary);
  animation: upload-pulse 1.5s ease-in-out infinite;
}
@keyframes upload-pulse {
  0%, 100% { opacity: 1; transform: translateY(0); }
  50% { opacity: 0.6; transform: translateY(-4px); }
}
.upload-progress-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--md-on-surface);
  margin: 0 0 6px;
}
.upload-progress-subtitle {
  font-size: 0.8125rem;
  color: var(--md-on-surface-variant);
  margin: 0 0 20px;
}
.upload-progress-bar-track {
  width: 100%;
  height: 6px;
  background: var(--md-surface-variant);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 12px;
}
.upload-progress-bar-fill {
  height: 100%;
  background: var(--md-primary);
  border-radius: 3px;
  transition: width 0.3s ease;
}
.upload-progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--md-on-surface-variant);
}