.tips-box {
  padding: 0.1rem 0.9rem;
  margin-bottom: 1rem;
  border-radius: var(--border-radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.tips-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  max-height: 1.5rem;
}

.tips-content {
  margin-top: 1rem;
  font-size: 0.75rem;
  line-height: 1.5;
  text-align: left;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 220ms ease, opacity 180ms ease;
}

.tips-box.open .tips-content {
  max-height: 50rem;
  opacity: 1;
}

.tips-content li {
  margin-bottom: 0.15rem;
}

#toggle-tips {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  margin-top: 1rem;
  min-height: auto;
}

.drop-zone {
  padding: 1.5rem;
  border: 2px dashed var(--primary-color);
  border-radius: var(--border-radius);
  background-color: var(--surface-alt);
  text-align: center;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), transform var(--transition-normal);
  cursor: pointer;
  margin-bottom: 1rem;
}

.drop-zone.dragover {
  background-color: var(--primary-light);
  border-color: var(--primary-hover);
  transform: scale(1.01);
}

.drop-zone .fa-upload {
  font-size: 2.8rem;
  color: #007bff;
  margin-bottom: 10px;
  transition: transform var(--transition-normal), color var(--transition-normal);
}

.drop-zone.dragover .fa-upload {
  color: var(--primary-hover);
  transform: scale(1.12);
}

.drop-zone h4 {
  margin: 0.5rem 0;
  font-weight: 600;
}

.drop-zone p {
  margin: 0.5rem 0 0;
  color: var(--text-muted);
}

.drop-zone a {
  color: var(--primary-color);
  font-weight: 600;
}

.drop-zone a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.formats {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  opacity: 0.8;
  color: var(--text-muted);
}

.selection-info {
  border-left: 4px solid var(--primary-color);
  background-color: var(--primary-light);
  margin-bottom: 1rem;
  padding: 0.6rem 0.8rem;
  border-radius: var(--border-radius-sm);
  font-weight: 500;
  margin-top: 1rem;
}

.file-list-container {
  display: none;
  margin-top: 1rem;
}

.file-list-container.show {
  display: block;
}

.file-list-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.file-list-title h5 {
  margin: 0;
  font-weight: 600;
}

.file-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 0.7rem;
}

.file-item {
  background: var(--surface);
  border-radius: var(--border-radius);
  padding: 0.45rem;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.file-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.file-item img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 0.25rem;
}

.file-info {
  font-size: 0.75rem;
  line-height: 1.35;
}

.file-name {
  font-weight: 500;
  margin-bottom: 0.15rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  color: var(--text-muted);
}

.remove-btn {
  color: var(--danger-color);
  cursor: pointer;
  padding: 4px 6px;
  border-radius: var(--border-radius-sm);
  transition: background-color var(--transition-fast);
  text-align: center;
  font-size: 0.85rem;
  background: transparent;
  border: none;
  display: block;
  width: 100%;
  min-width: 2rem;
}

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

.session-card {
  margin-bottom: 1rem;
}

.session-card img {
  border-radius: var(--border-radius-sm);
}

.session-thumb {
  position: relative;
}

.session-thumb button {
  position: absolute;
  bottom: 6px;
  right: 6px;
  z-index: 10;
}

#session-uploaded-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 0.75rem;
}

.session-thumb img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
}

.upload-btn-wrapper {
  margin-top: 1.25rem;
  position: sticky;
  bottom: 1rem;
  z-index: var(--z-sticky);
}

#upload-btn {
  padding: 0.95rem;
  width: 100%;
  font-size: 1rem;
}

.compact-alert {
  padding: 0.6rem 0.9rem;
  font-size: 0.9rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.compact-alert .alert-main {
  flex-grow: 1;
}

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

.compact-alert .btn {
  padding: 0.25rem 0.6rem;
  font-size: 0.8rem;
  min-height: auto;
}

#upload-progress {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  align-items: center;
  justify-content: center;
  padding: 16px;
}

#upload-progress .upload-progress-bar,
#upload-progress .upload-progress-spinner {
  width: min(520px, calc(100vw - 32px));
  background: #fff;
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

#upload-progress .upload-progress-spinner {
  display: none;
  text-align: center;
}

#upload-progress .upload-progress-spinner .spinner-border {
  width: 3rem;
  height: 3rem;
}

#upload-progress .upload-progress-text {
  margin-top: 10px;
  font-weight: 700;
}

#upload-progress.show {
  display: flex !important;
}

@media (max-width: 576px) {
  .drop-zone {
    border: none !important;
    padding: 0 !important;
    background: transparent !important;
  }

  .drop-desktop {
    display: none !important;
  }

  .drop-mobile button {
    border-radius: var(--border-radius);
    padding: 1rem;
    font-size: 1.05rem;
  }

  .file-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .file-item {
    padding: 0;
    border: none;
    background: transparent;
    box-shadow: none;
  }

  .file-item img {
    border-radius: 6px;
    margin: 0;
  }

  .file-info,
  .file-name,
  .file-size {
    display: none !important;
  }

  .remove-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--border-radius-sm);
    padding: 4px 6px;
    width: auto;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  }

  .compact-alert {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }

  .compact-alert .alert-actions {
    justify-content: center;
  }

  #upload-progress .upload-progress-bar {
    display: none !important;
  }

  #upload-progress .upload-progress-spinner {
    display: block !important;
    background: transparent !important;
    box-shadow: none !important;
    padding: 0 !important;
    width: auto !important;
  }

  #upload-progress .upload-progress-text {
    display: none !important;
  }
}