:root {
  --bg-main: #0f172a;
  --bg-surface: #1e293b;
  --bg-pane: #111827;
  --border: #334155;
  --text-primary: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --success: #10b981;
  --error: #ef4444;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.app-header {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo {
  font-size: 1.75rem;
}

.brand h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-primary {
  background-color: var(--accent);
  color: #0f172a;
}

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

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--border);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  color: var(--text-primary);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-sm {
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
}

.workbench {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 0;
}

.editor-pane, .preview-pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background-color: var(--bg-pane);
}

.editor-pane {
  border-right: 1px solid var(--border);
}

.pane-header {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.editor-controls, .preview-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  user-select: none;
}

textarea#code-input {
  flex: 1;
  background: transparent;
  color: #e2e8f0;
  border: none;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  resize: none;
  outline: none;
  tab-size: 2;
}

.pane-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 0.4rem 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

.shortcut-tip kbd {
  background-color: var(--border);
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
  font-family: var(--font-mono);
}

.preview-body {
  flex: 1;
  overflow: auto;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, rgba(51,65,85,0.2) 1px, transparent 1px);
  background-size: 16px 16px;
}

.preview-body svg,
.preview-body img {
  max-width: 100%;
  max-height: 100%;
  height: auto;
  border-radius: 8px;
  background-color: #ffffff !important;
  color: #0f172a;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.5rem;
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  max-width: 320px;
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.error-card {
  background-color: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error);
  color: #fca5a5;
  border-radius: 6px;
  padding: 1rem;
  width: 90%;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-all;
}

.status-bar {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 0.35rem 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.lang-select {
  background-color: var(--bg-pane);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 0.45rem 0.65rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s ease;
}

.lang-select:focus {
  border-color: var(--accent);
}

/* --- Suporte a Right-to-Left (RTL) para Árabe (Norma GOST Seção 10.3) --- */
html[dir="rtl"] {
  direction: rtl;
}

html[dir="rtl"] body {
  text-align: right;
}

html[dir="rtl"] .pane-footer {
  flex-direction: row-reverse;
}

html[dir="rtl"] textarea#code-input {
  direction: ltr; /* Código-fonte (R, CSV, Mermaid) permanece LTR */
  text-align: left;
}

/* --- Guia de Campos & Modal do Heredograma --- */
.btn-guide-link {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.btn-guide-link:hover {
  background-color: rgba(56, 189, 248, 0.12);
  border-color: var(--accent);
}

.hidden {
  display: none !important;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.82);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-container {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  max-width: 820px;
  width: 100%;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  animation: modalFadeIn 0.15s ease-out;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.97);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.modal-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  transition: color 0.15s, background-color 0.15s;
}

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

.modal-body {
  padding: 1.25rem;
  overflow-y: auto;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-primary);
}

.guide-intro {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.guide-intro code,
.modal-body code {
  background-color: var(--bg-pane);
  border: 1px solid var(--border);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
}

.modal-body h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin: 1.25rem 0 0.5rem;
  color: var(--text-primary);
}

.guide-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
  font-size: 0.8rem;
}

.guide-table th,
.guide-table td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.guide-table th {
  background-color: var(--bg-pane);
  color: var(--text-muted);
  font-weight: 600;
}

.guide-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

.guide-code {
  background-color: var(--bg-pane);
  border: 1px solid var(--border);
  padding: 0.65rem 0.85rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #a5f3fc;
  margin-bottom: 0.75rem;
  overflow-x: auto;
}

.guide-list {
  padding-left: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
}

.guide-list li {
  margin-bottom: 0.35rem;
}

@media (max-width: 860px) {
  body {
    overflow: auto;
    height: auto;
  }
  .app-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
  }
  .actions {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .actions .btn {
    flex: 1;
    justify-content: center;
  }
  .workbench {
    grid-template-columns: 1fr;
    height: auto;
  }
  textarea#code-input {
    min-height: 250px;
  }
  .preview-body {
    min-height: 350px;
  }
}