/* ===== Document Upload Card ===== */

.home-upload-card {
  max-width: 700px;
  margin: 0 auto 24px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.home-upload-card .hc-left {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.upload-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.upload-dropzone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.upload-dropzone:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.04);
}

.upload-dropzone.dragover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.08);
}

.dropzone-icon {
  font-size: 1.6rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.dropzone-text {
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 500;
}

.dropzone-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.dropzone-file {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
}

.dropzone-filename {
  font-weight: 600;
  color: var(--text);
}

.dropzone-filesize {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.dropzone-clear {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
}

.dropzone-clear:hover {
  color: #f87171;
  background: rgba(248, 113, 113, 0.1);
}

.upload-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.upload-divider::before,
.upload-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.upload-url-row {
  display: flex;
  gap: 8px;
}

.upload-url-input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-surface);
  color: var(--text);
  font-size: 0.9rem;
}

.upload-url-input.shake {
  animation: shake 0.4s;
}

.upload-instructions { margin-top: 4px; }
.upload-instructions-input {
  width: 100%;
  padding: 8px 12px;
  font-size: 0.88rem;
  line-height: 1.5;
  background: var(--bg-surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  resize: vertical;
}
.upload-instructions-input:focus {
  outline: none;
  border-color: var(--primary);
}
.upload-instructions-input::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.upload-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 4px;
}

.upload-model-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.upload-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.upload-model-select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-surface);
  color: var(--text);
  font-size: 0.85rem;
}

.upload-start-btn {
  padding: 8px 20px;
}

.upload-start-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.upload-status {
  font-size: 0.85rem;
  min-height: 1.2em;
}

.upload-status.error {
  color: #f87171;
}

/* ===== Source Badge (session sidebar) ===== */
.source-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 6px;
  max-width: 100%;
  overflow: hidden;
}

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

/* ===== Milestone Headers (session sidebar) ===== */
.milestone-header {
  padding: 10px 16px 4px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: 8px;
}

.milestone-header:first-child {
  border-top: none;
  margin-top: 0;
}

/* ===== Right Panel Tabs (Ask AI / Source) ===== */
.right-panel-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-surface);
  border-radius: 8px;
  padding: 2px;
}

.rp-tab {
  background: none;
  border: none;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

.rp-tab:hover {
  color: var(--text);
}

.rp-tab.active {
  background: var(--primary);
  color: white;
}

/* ===== Document Viewer ===== */
.doc-viewer {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
}

.doc-viewer-loading {
  display: flex;
  justify-content: center;
  padding: 40px 0;
}

.doc-viewer-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.doc-viewer-icon {
  font-size: 1.4rem;
}

.doc-viewer-filename {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  word-break: break-word;
}

.doc-viewer-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.doc-viewer-text {
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text);
}

.doc-viewer-text .doc-page-header,
.doc-viewer-text .doc-slide-header {
  display: block;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--primary-light);
  margin-top: 20px;
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}

.doc-viewer-text .doc-page-header:first-child,
.doc-viewer-text .doc-slide-header:first-child {
  margin-top: 0;
}

.doc-viewer-rendered {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text);
  overflow-y: auto;
  padding: 0 4px;
}
.doc-viewer-rendered h1, .doc-viewer-rendered h2, .doc-viewer-rendered h3 {
  color: var(--text);
  margin: 1.2em 0 0.4em;
  line-height: 1.3;
}
.doc-viewer-rendered h1 { font-size: 1.35rem; }
.doc-viewer-rendered h2 { font-size: 1.15rem; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.doc-viewer-rendered h3 { font-size: 1rem; }
.doc-viewer-rendered p { margin-bottom: 0.8em; }
.doc-viewer-rendered ul, .doc-viewer-rendered ol { padding-left: 1.4em; margin-bottom: 0.8em; }
.doc-viewer-rendered li { margin-bottom: 0.3em; }
.doc-viewer-rendered code {
  background: var(--bg-surface);
  border-radius: 4px;
  padding: 2px 5px;
  font-family: 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.88em;
  color: var(--primary-light);
}
.doc-viewer-rendered pre {
  background: #1a1a2e;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  overflow-x: auto;
  margin: 1em 0;
}
.doc-viewer-rendered pre code { background: none; padding: 0; color: #e2e8f0; }
.doc-viewer-rendered blockquote {
  border-left: 3px solid var(--primary);
  padding-left: 14px;
  margin: 0.8em 0;
  color: var(--text-muted);
  font-style: italic;
}
.doc-viewer-rendered table { width: 100%; border-collapse: collapse; margin: 0.8em 0; }
.doc-viewer-rendered th, .doc-viewer-rendered td { padding: 8px 12px; border: 1px solid var(--border); text-align: left; }
.doc-viewer-rendered th { background: var(--bg-surface); font-weight: 600; }
.doc-viewer-rendered img { max-width: 100%; border-radius: 6px; }
.doc-viewer-rendered a { color: var(--primary-light); text-decoration: underline; }

.doc-viewer-image {
  max-width: 100%;
  border-radius: 8px;
  margin-top: 8px;
}

.doc-viewer-url-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(99, 102, 241, 0.08);
  border-radius: 8px;
  color: var(--primary-light);
  font-size: 0.82rem;
  text-decoration: none;
  margin-bottom: 16px;
  word-break: break-all;
}

.doc-viewer-url-link:hover {
  background: rgba(99, 102, 241, 0.15);
}

.doc-copy-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}

.doc-copy-btn:hover {
  color: var(--text);
  border-color: var(--primary);
}

/* ===== Native Document Viewer (PDF / URL iframe) ===== */
.doc-viewer-native {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.doc-viewer-pdf {
  flex: 1;
  width: 100%;
  min-height: 400px;
  border: none;
  border-radius: 8px;
  background: var(--bg-surface);
}

.doc-viewer-iframe {
  flex: 1;
  width: 100%;
  min-height: 400px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
}

.doc-iframe-fallback {
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.doc-iframe-fallback a {
  color: var(--primary-light);
}

.doc-iframe-fallback .doc-copy-btn {
  margin-top: 12px;
}

/* ===== Mobile overrides ===== */
@media (max-width: 768px) {
  .home-upload-card { padding: 16px; }
  .home-upload-card .hc-left { margin-bottom: 12px; }
  .upload-dropzone { padding: 20px 16px; }
  .dropzone-text { font-size: 0.88rem; }
  .upload-url-row { flex-direction: column; }
  .upload-url-row .btn-sm { padding: 10px; font-size: 0.9rem; }
  .upload-url-input { width: 100%; font-size: 16px; /* prevent iOS zoom */ }
  .upload-footer { flex-direction: column; align-items: stretch; }
  .upload-model-row { justify-content: space-between; }
  .upload-start-btn { width: 100%; padding: 12px; font-size: 0.95rem; }
  .upload-status { font-size: 0.82rem; }
}