:root {
  --bg-main-light: #ffffff;
  --bg-sidebar-light: #f5f5f5;
  --bg-card-light: #ffffff;
  --text-main-light: #000000;
  --text-secondary-light: #666666;
  --accent: #333333;
  --accent-hover: #000000;
  --accent-light: #e5e5e5;
  --success: #4a4a4a;
  --warning: #666666;
  --error: #333333;
  --border-light: #cccccc;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.15), 0 2px 4px -2px rgb(0 0 0 / 0.15);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.2), 0 4px 6px -4px rgb(0 0 0 / 0.2);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.25), 0 8px 10px -6px rgb(0 0 0 / 0.25);

  --bg-main-dark: #1a1a1a;
  --bg-sidebar-dark: #2d2d2d;
  --bg-card-dark: #333333;
  --text-main-dark: #ffffff;
  --text-secondary-dark: #b3b3b3;
  --border-dark: #4d4d4d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.light {
  background: var(--bg-main-light);
  color: var(--text-main-light);
}

body.dark {
  background: var(--bg-main-dark);
  color: var(--text-main-dark);
}

.container {
  display: flex;
  flex-direction: row;
  height: 100vh;
  gap: 0;
}

/* Sidebar vertical à esquerda */
.sidebar {
  width: 360px;
  padding: 16px 20px;
  background: var(--bg-sidebar-light);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
  overflow-x: hidden;
  border-right: 1px solid var(--border-light);
  flex-shrink: 0;
}

body.dark .sidebar {
  background: var(--bg-sidebar-dark);
  border-right-color: var(--border-dark);
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.3);
}

/* Cards para seções */
.upload-section,
section {
  background: var(--bg-card-light);
  padding: 16px;
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
  width: 100%;
  display: flex;
  flex-direction: column;
}

body.dark .upload-section,
body.dark section {
  background: var(--bg-card-dark);
  border-color: var(--border-dark);
}

.upload-section:hover,
section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Section header com ações */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 8px;
}

.header-actions {
  display: flex;
  gap: 4px;
  align-items: center;
}

.btn-icon {
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid var(--border-light);
  background: var(--bg-card-light);
  cursor: pointer;
  font-size: 0.75rem;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 24px;
}

body.dark .btn-icon {
  background: var(--bg-card-dark);
  border-color: var(--border-dark);
  color: var(--text-main-dark);
}

.btn-icon:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  transform: scale(1.05);
}

body.dark .btn-icon:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-icon:active {
  transform: scale(0.95);
}

.upload-section h3,
section h3 {
  margin: 0 0 12px 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main-light);
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

body.dark .upload-section h3,
body.dark section h3 {
  color: var(--text-main-dark);
}

.section-header h3::before,
.upload-section h3::before {
  content: '📤';
  font-size: 0.85rem;
}

.prompt-title {
  margin-top: 8px !important;
  margin-bottom: 6px !important;
}

.prompt-title::before {
  content: '✏️';
  font-size: 0.85rem;
}

.model-title {
  margin-top: 12px !important;
  margin-bottom: 6px !important;
}

.model-title::before {
  content: '🤖';
  font-size: 0.85rem;
}

section h3::before {
  content: '📁';
  font-size: 0.85rem;
}

/* Input de arquivo moderno */
.upload-section input[type="file"] {
  width: 100%;
  margin-bottom: 8px;
  padding: 6px 10px;
  font-size: 0.75rem;
  border: 1px dashed var(--border-light);
  border-radius: 6px;
  background: var(--bg-main-light);
  cursor: pointer;
  transition: all 0.3s ease;
}

body.dark .upload-section input[type="file"] {
  border-color: var(--border-dark);
  background: var(--bg-main-dark);
}

.upload-section input[type="file"]:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

body.dark .upload-section input[type="file"]:hover {
  background: rgba(255, 255, 255, 0.1);
}

.prompt-help-text {
  font-size: 0.7rem;
  color: var(--text-secondary-light);
  margin-top: 4px;
  margin-bottom: 6px;
  font-style: italic;
  padding-left: 2px;
  line-height: 1.2;
}

body.dark .prompt-help-text {
  color: var(--text-secondary-dark);
}

.model-select {
  width: 100%;
  margin-bottom: 8px;
  padding: 8px 10px;
  font-size: 0.75rem;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  background: var(--bg-main-light);
  color: var(--text-main-light);
  cursor: pointer;
  transition: all 0.3s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 12px;
  padding-right: 30px;
}

body.dark .model-select {
  border-color: var(--border-dark);
  background: var(--bg-main-dark);
  color: var(--text-main-dark);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23fff' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
}

.model-select:hover {
  border-color: var(--accent);
  background-color: var(--accent-light);
}

body.dark .model-select:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.model-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(51, 51, 51, 0.1);
}

body.dark .model-select:focus {
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

.model-help-text {
  font-size: 0.7rem;
  color: var(--text-secondary-light);
  margin-top: 4px;
  margin-bottom: 6px;
  font-style: italic;
  padding-left: 2px;
  line-height: 1.2;
}

body.dark .model-help-text {
  color: var(--text-secondary-dark);
}

.status-text {
  font-size: 0.7rem;
  margin-top: 6px;
  min-height: 18px;
  padding: 4px 8px;
  border-radius: 4px;
  background: var(--bg-main-light);
  border-left: 2px solid var(--accent);
  font-weight: 500;
  transition: all 0.3s ease;
  line-height: 1.3;
}

body.dark .status-text {
  background: var(--bg-main-dark);
}

.status-text:empty {
  border-left-color: transparent;
}

.status-text.status-success,
.status-text[style*="green"] {
  border-left-color: var(--success);
  background: rgba(0, 0, 0, 0.05);
  color: var(--success);
}

body.dark .status-text.status-success,
body.dark .status-text[style*="green"] {
  background: rgba(255, 255, 255, 0.1);
}

.status-text.status-error,
.status-text[style*="red"] {
  border-left-color: var(--error);
  background: rgba(0, 0, 0, 0.05);
  color: var(--error);
}

body.dark .status-text.status-error,
body.dark .status-text[style*="red"] {
  background: rgba(255, 255, 255, 0.1);
}

/* Botões modernos */
.btn-primary,
.btn-secondary {
  padding: 6px 12px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  color: #fff;
  width: 100%;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn-primary:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-card-light);
  color: var(--accent);
  border: 2px solid var(--accent);
}

body.dark .btn-secondary {
  background: var(--bg-card-dark);
  color: #fff;
  border-color: var(--accent);
}

.btn-secondary:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Tabs modernas */
.tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  background: var(--bg-main-light);
  padding: 4px;
  border-radius: 8px;
}

body.dark .tabs {
  background: var(--bg-main-dark);
}

.tab {
  flex: 1;
  padding: 6px 12px;
  border-radius: 6px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all 0.3s ease;
  color: var(--text-secondary-light);
}

body.dark .tab {
  color: var(--text-secondary-dark);
}

.tab.active {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.tab:hover:not(.active) {
  background: var(--accent-light);
  color: var(--accent);
}

body.dark .tab:hover:not(.active) {
  background: rgba(255, 255, 255, 0.15);
}

/* Lista de arquivos moderna */
.file-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
  overflow-x: hidden;
  max-height: 300px;
  padding-right: 4px;
}

.file-list::-webkit-scrollbar {
  width: 8px;
}

.file-list::-webkit-scrollbar-track {
  background: var(--bg-main-light);
  border-radius: 4px;
}

body.dark .file-list::-webkit-scrollbar-track {
  background: var(--bg-main-dark);
}

.file-list::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}

body.dark .file-list::-webkit-scrollbar-thumb {
  background: var(--border-dark);
}

.file-list::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

.file-item {
  padding: 10px 14px;
  text-align: left;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  border: 2px solid var(--border-light);
  background: var(--bg-card-light);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.file-item-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-item-delete {
  flex-shrink: 0;
  padding: 4px 6px;
  border: none;
  background: transparent;
  cursor: pointer;
  opacity: 0.6;
  border-radius: 4px;
  transition: opacity 0.2s, background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  color: inherit;
}

.file-item-delete:hover {
  opacity: 1;
  background: rgba(239, 68, 68, 0.2);
  color: #dc2626;
}

.file-item:hover .file-item-delete {
  opacity: 0.9;
}

body.dark .file-item {
  background: var(--bg-card-dark);
  border-color: var(--border-dark);
}

.file-item::before {
  content: '📄';
  font-size: 1.1rem;
}

.file-item:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

body.dark .file-item:hover {
  background: rgba(255, 255, 255, 0.15);
}

.file-item.selected {
  border-color: var(--accent);
  background: var(--accent-light);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.2);
  font-weight: 600;
}

body.dark .file-item.selected {
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
}

/* Preview panel moderno */
.preview-panel {
  flex: 1;
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow: hidden;
  min-height: 0;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border-light);
}

body.dark .preview-header {
  border-bottom-color: var(--border-dark);
}

.preview-header h2 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

body.dark .preview-header h2 {
  color: var(--text-main-dark);
}

.preview-header h2::before {
  content: '👁️';
  font-size: 1.5rem;
}

.preview-content {
  flex: 1;
  border-radius: 16px;
  padding: 32px 40px;
  overflow-y: auto;
  font-size: 1rem;
  line-height: 1.7;
  background: var(--bg-card-light);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
}

body.dark .preview-content {
  background: var(--bg-card-dark);
  border-color: var(--border-dark);
}

.preview-content::-webkit-scrollbar {
  width: 10px;
}

.preview-content::-webkit-scrollbar-track {
  background: var(--bg-main-light);
  border-radius: 5px;
}

body.dark .preview-content::-webkit-scrollbar-track {
  background: var(--bg-main-dark);
}

.preview-content::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 5px;
}

body.dark .preview-content::-webkit-scrollbar-thumb {
  background: var(--border-dark);
}

.preview-content::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Estilos para Markdown */
.preview-content h1,
.preview-content h2,
.preview-content h3,
.preview-content h4,
.preview-content h5,
.preview-content h6 {
  margin-top: 32px;
  margin-bottom: 16px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main-light);
}

body.dark .preview-content h1,
body.dark .preview-content h2,
body.dark .preview-content h3,
body.dark .preview-content h4,
body.dark .preview-content h5,
body.dark .preview-content h6 {
  color: var(--text-main-dark);
}

.preview-content h1 {
  font-size: 2.25em;
  border-bottom: 3px solid var(--border-light);
  padding-bottom: 12px;
}

body.dark .preview-content h1 {
  border-bottom-color: var(--border-dark);
}

.preview-content h2 {
  font-size: 1.75em;
  border-bottom: 2px solid var(--border-light);
  padding-bottom: 10px;
}

body.dark .preview-content h2 {
  border-bottom-color: var(--border-dark);
}

.preview-content h3 {
  font-size: 1.5em;
}

.preview-content p {
  margin-bottom: 16px;
  color: var(--text-main-light);
}

body.dark .preview-content p {
  color: var(--text-main-dark);
}

.preview-content ul,
.preview-content ol {
  margin-bottom: 16px;
  padding-left: 32px;
}

.preview-content li {
  margin-bottom: 8px;
}

.preview-content li > p {
  margin-top: 16px;
}

.preview-content blockquote {
  padding: 16px 20px;
  color: var(--text-secondary-light);
  border-left: 4px solid var(--accent);
  margin: 20px 0;
  background: var(--accent-light);
  border-radius: 0 8px 8px 0;
}

body.dark .preview-content blockquote {
  color: var(--text-secondary-dark);
  background: rgba(255, 255, 255, 0.05);
}

.preview-content a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: all 0.2s ease;
}

.preview-content a:hover {
  border-bottom-color: var(--accent);
}

.preview-content table {
  border-collapse: collapse;
  margin: 24px 0;
  width: 100%;
  box-shadow: var(--shadow-sm);
  border-radius: 8px;
  overflow: hidden;
}

.preview-content table th,
.preview-content table td {
  padding: 12px 16px;
  border: 1px solid var(--border-light);
}

body.dark .preview-content table th,
body.dark .preview-content table td {
  border-color: var(--border-dark);
}

.preview-content table th {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  color: #fff;
  font-weight: 600;
  text-align: left;
}

.preview-content table tr:nth-child(2n) {
  background-color: var(--bg-main-light);
}

body.dark .preview-content table tr:nth-child(2n) {
  background-color: rgba(255, 255, 255, 0.05);
}

.preview-content hr {
  height: 2px;
  padding: 0;
  margin: 32px 0;
  background: linear-gradient(90deg, transparent, var(--border-light), transparent);
  border: 0;
}

body.dark .preview-content hr {
  background: linear-gradient(90deg, transparent, var(--border-dark), transparent);
}

.preview-content img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin: 24px 0;
  box-shadow: var(--shadow-md);
}

/* Syntax highlighting */
.preview-content pre {
  padding: 20px;
  overflow: auto;
  font-size: 0.9rem;
  line-height: 1.6;
  background: var(--bg-main-light);
  border-radius: 12px;
  margin: 20px 0;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}

body.dark .preview-content pre {
  background: #2d2d2d;
  border-color: var(--border-dark);
}

.preview-content code {
  padding: 3px 8px;
  font-size: 0.9em;
  background: var(--accent-light);
  border-radius: 6px;
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Source Code Pro', monospace;
  color: var(--accent);
  font-weight: 500;
}

body.dark .preview-content code {
  background: rgba(255, 255, 255, 0.15);
  color: #e5e5e5;
}

.preview-content pre code {
  padding: 0;
  background: transparent;
  border-radius: 0;
  font-size: inherit;
  color: inherit;
}

.preview-content pre {
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Source Code Pro', monospace;
}

.preview-content .hljs {
  background: var(--bg-main-light);
  padding: 20px;
  border-radius: 12px;
}

body.dark .preview-content .hljs {
  background: #2d2d2d;
}

.preview-content pre.hljs {
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* Estilos para diagramas Mermaid */
.preview-content .mermaid {
  margin: 32px 0;
  padding: 24px;
  background: var(--bg-main-light);
  border-radius: 16px;
  border: 2px solid var(--border-light);
  text-align: center;
  overflow-x: auto;
  overflow-y: hidden;
  box-shadow: var(--shadow-md);
  position: relative;
}

body.dark .preview-content .mermaid {
  background: var(--bg-main-dark);
  border-color: var(--border-dark);
}

.preview-content .mermaid svg {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.preview-content .mermaid:empty::before {
  content: 'Carregando diagrama...';
  color: var(--text-secondary-light);
  font-style: italic;
}

/* Integração com github-markdown-css (WYSIWYG) - evita padding duplicado e garante contraste */
.preview-content .markdown-body {
  padding: 0;
  background: transparent;
  color: var(--text-main-light);
  font-size: inherit;
}

body.dark .preview-content .markdown-body {
  color: var(--text-main-dark);
}

/* Garante contraste adequado - evita texto muito claro */
.preview-content .markdown-body p,
.preview-content .markdown-body li,
.preview-content .markdown-body td {
  color: var(--text-main-light);
}

body.dark .preview-content .markdown-body p,
body.dark .preview-content .markdown-body li,
body.dark .preview-content .markdown-body td {
  color: var(--text-main-dark);
}

/* Tabelas: contraste adequado - sobrescreve github-markdown-css */
/* Modo claro: fundo claro, texto escuro */
.preview-content table td,
.preview-content .markdown-body table td {
  color: #000000 !important;
  background-color: #ffffff !important;
}

.preview-content table tr:nth-child(2n) td,
.preview-content .markdown-body table tr:nth-child(2n) td {
  background-color: #f6f8fa !important;
  color: #000000 !important;
}

/* Modo escuro: fundo escuro, texto branco */
body.dark .preview-content table td,
body.dark .preview-content .markdown-body table td {
  color: #ffffff !important;
  background-color: var(--bg-card-dark) !important;
}

body.dark .preview-content table tr:nth-child(2n) td,
body.dark .preview-content .markdown-body table tr:nth-child(2n) td {
  background-color: rgba(255, 255, 255, 0.08) !important;
  color: #ffffff !important;
}

body.dark .preview-content .markdown-body table,
body.dark .preview-content table {
  border-color: var(--border-dark);
}

body.dark .preview-content .markdown-body table th,
body.dark .preview-content table th {
  background: var(--accent) !important;
  color: #fff !important;
  border-color: var(--border-dark);
}

body.dark .preview-content .mermaid:empty::before {
  color: var(--text-secondary-dark);
}

/* Task lists (GitHub Flavored Markdown) */
.preview-content input[type="checkbox"] {
  margin-right: 8px;
  cursor: pointer;
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.preview-content li:has(input[type="checkbox"]) {
  list-style: none;
  margin-left: -20px;
}

.preview-content li:has(input[type="checkbox"][checked]) {
  text-decoration: line-through;
  opacity: 0.7;
}

/* Melhorias para tabelas GFM */
.preview-content table {
  display: table;
  width: 100%;
  margin: 24px 0;
  border-collapse: collapse;
}

@media (max-width: 768px) {
  .preview-content table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

.preview-content table thead {
  position: sticky;
  top: 0;
  z-index: 10;
}

.hidden {
  display: none;
}

/* Animações */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.file-item,
.upload-section,
section {
  animation: fadeIn 0.3s ease-out;
}

/* Responsividade */
@media (max-width: 900px) {
  .container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-light);
    max-height: 50vh;
  }

  body.dark .sidebar {
    border-bottom-color: var(--border-dark);
  }

  .file-list {
    max-height: 200px;
  }

  .preview-panel {
    padding: 20px;
  }
}