:root {
  --bg-main: #070b0e;
  --bg-surface: #0d131a;
  --bg-card: #121a24;
  --bg-input: #0a0f16;
  --neon-green: #00ff66;
  --neon-green-glow: rgba(0, 255, 102, 0.35);
  --neon-green-dim: #00b347;
  --neon-cyan: #00e5ff;
  --neon-cyan-glow: rgba(0, 229, 255, 0.3);
  --neon-red: #ff3366;
  --neon-yellow: #ffea00;
  --text-main: #e2f1e7;
  --text-muted: #728998;
  --border-neon: rgba(0, 255, 102, 0.25);
  --border-glow: 0 0 10px rgba(0, 255, 102, 0.2);
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Menlo, Consolas, monospace;
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-mono);
  min-height: 100vh;
  overflow: hidden;
  background-image: 
    radial-gradient(ellipse at top right, rgba(0, 255, 102, 0.05), transparent 60%),
    radial-gradient(ellipse at bottom left, rgba(0, 229, 255, 0.04), transparent 60%);
}

/* Cyberpunk scanlines effect */
body::before {
  content: " ";
  display: block;
  position: fixed;
  top: 0; left: 0; bottom: 0; right: 0;
  background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.03), rgba(0, 255, 0, 0.01), rgba(0, 0, 255, 0.03));
  z-index: 999;
  background-size: 100% 3px, 6px 100%;
  pointer-events: none;
  opacity: 0.4;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: var(--neon-green-dim);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--neon-green);
  box-shadow: 0 0 8px var(--neon-green);
}

/* Layout */
.app-container {
  display: grid;
  grid-template-columns: 260px 340px 1fr;
  height: 100vh;
  overflow: hidden;
}

@media (max-width: 900px) {
  .app-container {
    grid-template-columns: 1fr;
    height: auto;
    overflow-y: auto;
  }
}

/* Columns */
.sidebar, .notes-panel, .editor-panel {
  display: flex;
  flex-direction: column;
  height: 100vh;
  border-right: 1px solid var(--border-neon);
  background-color: var(--bg-surface);
  overflow: hidden;
}

.editor-panel {
  border-right: none;
  background-color: var(--bg-main);
  height: 100vh;
}

/* Header Sections */
.panel-header {
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-neon);
  background: linear-gradient(180deg, rgba(0, 255, 102, 0.06), transparent);
  min-height: 54px;
  flex-shrink: 0;
}

.brand-title {
  color: var(--neon-green);
  font-size: 1.1rem;
  font-weight: bold;
  letter-spacing: 1px;
  text-shadow: 0 0 8px var(--neon-green-glow);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Checkbox de Formato Cyberpunk */
.cyber-checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.8rem;
  color: var(--text-main);
  cursor: pointer;
  user-select: none;
  padding: 4px 8px;
  border: 1px solid rgba(0, 255, 102, 0.2);
  border-radius: 3px;
  background: rgba(18, 26, 36, 0.4);
  transition: all 0.2s ease;
}

.cyber-checkbox-label:hover {
  border-color: var(--neon-green);
  color: var(--neon-green);
}

.cyber-checkbox-label input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border: 1px solid var(--neon-green);
  background: transparent;
  cursor: pointer;
  outline: none;
  position: relative;
  display: inline-block;
  vertical-align: middle;
}

.cyber-checkbox-label input[type="checkbox"]:checked {
  background-color: var(--neon-green);
  box-shadow: 0 0 6px var(--neon-green-glow);
}

.cyber-checkbox-label input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: -2px;
  left: 2px;
  color: #070b0e;
  font-size: 11px;
  font-weight: bold;
}

/* Inputs & Search */
.cyber-input {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-neon);
  color: var(--neon-green);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  outline: none;
  transition: all 0.2s ease;
}

.cyber-input:focus {
  border-color: var(--neon-green);
  box-shadow: 0 0 10px var(--neon-green-glow);
}

/* Buttons */
.cyber-btn {
  background: transparent;
  color: var(--neon-green);
  border: 1px solid var(--neon-green);
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.cyber-btn:hover {
  background: var(--neon-green);
  color: #070b0e;
  box-shadow: 0 0 14px var(--neon-green-glow);
}

.cyber-btn-cyan {
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
}
.cyber-btn-cyan:hover {
  background: var(--neon-cyan);
  color: #070b0e;
  box-shadow: 0 0 14px var(--neon-cyan-glow);
}

.cyber-btn-danger {
  color: var(--neon-red);
  border-color: var(--neon-red);
}
.cyber-btn-danger:hover {
  background: var(--neon-red);
  color: #fff;
  box-shadow: 0 0 14px rgba(255, 51, 102, 0.4);
}

/* Barra de Herramientas de Edición Rápida (Markdown Toolbar) */
.editor-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(13, 19, 26, 0.95);
  border: 1px solid var(--border-neon);
  border-bottom: none;
  border-radius: 3px 3px 0 0;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.toolbar-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--neon-green);
  letter-spacing: 0.5px;
  margin-right: 2px;
}

.toolbar-btn {
  background: rgba(18, 26, 36, 0.8);
  color: var(--neon-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 2px;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.toolbar-btn:hover {
  background: var(--neon-cyan);
  color: #070b0e;
  border-color: var(--neon-cyan);
  box-shadow: 0 0 8px var(--neon-cyan-glow);
}

.toolbar-btn-tool {
  color: var(--text-main);
  border-color: rgba(0, 255, 102, 0.25);
  background: rgba(10, 15, 22, 0.7);
}

.toolbar-btn-tool:hover {
  background: var(--neon-green);
  color: #070b0e;
  border-color: var(--neon-green);
  box-shadow: 0 0 8px var(--neon-green-glow);
}

.toolbar-select {
  background: var(--bg-input);
  color: var(--neon-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
  padding: 3px 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border-radius: 2px;
  cursor: pointer;
  outline: none;
  transition: all 0.15s ease;
}

.toolbar-select:focus, .toolbar-select:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 8px var(--neon-cyan-glow);
}

/* Lists */
.panel-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.item-card {
  padding: 12px;
  background-color: var(--bg-card);
  border: 1px solid rgba(0, 255, 102, 0.15);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.item-card:hover {
  border-color: var(--neon-green);
  box-shadow: 0 0 8px rgba(0, 255, 102, 0.2);
  transform: translateX(3px);
}

.item-card.active {
  border-color: var(--neon-green);
  background-color: rgba(0, 255, 102, 0.08);
  box-shadow: inset 3px 0 0 var(--neon-green);
}

.item-title {
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.item-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.badge-tag {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 2px;
  background: rgba(0, 229, 255, 0.15);
  color: var(--neon-cyan);
  border: 1px solid var(--neon-cyan);
}

.badge-locked {
  background: rgba(255, 51, 102, 0.15);
  color: var(--neon-red);
  border-color: var(--neon-red);
}

/* Editor & Content Area */
.editor-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 16px 24px 20px 24px;
  gap: 10px;
  overflow: hidden;
  height: calc(100vh - 54px);
}

.note-title-input {
  font-size: 1.4rem;
  font-weight: 700;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-neon);
  color: var(--neon-green);
  padding: 6px 0;
  outline: none;
  font-family: var(--font-mono);
  transition: border-color 0.2s ease;
  flex-shrink: 0;
}

.note-title-input:focus {
  border-bottom-color: var(--neon-cyan);
  text-shadow: 0 0 8px var(--neon-cyan-glow);
}

.note-content-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  height: 100%;
}

/* Textarea de Texto / Código Libre (Modo por defecto) */
.note-textarea {
  flex: 1;
  width: 100%;
  height: 100%;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-neon);
  border-top: 1px solid rgba(0, 255, 102, 0.15);
  color: var(--text-main);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.65;
  resize: none;
  outline: none;
  overflow-y: auto;
  user-select: text;
  -webkit-user-select: text;
  border-radius: 0 0 2px 2px;
  transition: border-color 0.2s ease;
}

.note-textarea:focus {
  border-color: var(--neon-green);
  box-shadow: 0 0 10px var(--neon-green-glow);
}

/* Visor Markdown Opcional */
.note-viewer {
  flex: 1;
  width: 100%;
  height: 100%;
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-main);
  overflow-y: auto;
  user-select: text;
  -webkit-user-select: text;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-neon);
  border-radius: 2px;
  display: none;
}

.note-viewer h1, .note-viewer h2, .note-viewer h3, .note-viewer h4 {
  color: var(--neon-green);
  margin-top: 1.2em;
  margin-bottom: 0.6em;
  font-weight: 700;
}

.note-viewer h1 {
  font-size: 1.35rem;
  border-bottom: 1px solid rgba(0, 255, 102, 0.2);
  padding-bottom: 4px;
}

.note-viewer h2 {
  font-size: 1.15rem;
  color: var(--neon-cyan);
}

.note-viewer h3 {
  font-size: 1.05rem;
}

.note-viewer p {
  margin-bottom: 1em;
}

.note-viewer ul, .note-viewer ol {
  padding-left: 24px;
  margin-bottom: 1em;
}

.note-viewer li {
  margin-bottom: 0.3em;
}

.note-viewer blockquote {
  border-left: 4px solid var(--neon-cyan);
  padding: 8px 16px;
  margin: 1em 0;
  background: rgba(0, 229, 255, 0.05);
  color: #a0c0d0;
}

.note-viewer hr {
  border: none;
  border-top: 1px solid rgba(0, 255, 102, 0.2);
  margin: 1.5em 0;
}

.note-viewer a {
  color: var(--neon-cyan);
  text-decoration: none;
  border-bottom: 1px dotted var(--neon-cyan);
}

.note-viewer a:hover {
  color: var(--neon-green);
  border-bottom-style: solid;
}

.note-viewer table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
}

.note-viewer th, .note-viewer td {
  border: 1px solid rgba(0, 255, 102, 0.2);
  padding: 8px 12px;
  text-align: left;
}

.note-viewer th {
  background-color: rgba(0, 255, 102, 0.1);
  color: var(--neon-green);
}

.note-viewer code:not(pre code) {
  background: rgba(0, 255, 102, 0.12);
  color: var(--neon-green);
  padding: 2px 5px;
  border-radius: 3px;
  font-size: 0.88rem;
}

/* Highlight.js Markdown Cyberpunk Styling */
pre {
  background-color: #070b0e !important;
  border: 1px solid rgba(0, 255, 102, 0.25) !important;
  border-left: 4px solid var(--neon-green) !important;
  padding: 12px 16px !important;
  border-radius: 3px;
  overflow-x: auto;
  margin: 12px 0 !important;
}

code {
  font-family: var(--font-mono) !important;
  font-size: 0.9rem;
}

/* Highlight.js Neon Overrides */
.hljs-keyword, .hljs-selector-tag { color: #ff007f !important; font-weight: bold; }
.hljs-string, .hljs-title.class_ { color: #00ff66 !important; }
.hljs-comment, .hljs-quote { color: #5c7080 !important; font-style: italic; }
.hljs-number, .hljs-literal { color: #ffea00 !important; }
.hljs-function, .hljs-title.function_ { color: #00e5ff !important; }
.hljs-variable, .hljs-params { color: #ff9900 !important; }
.hljs-type, .hljs-built_in { color: #00e5ff !important; font-weight: bold; }

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal-overlay.hidden { display: none; }

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--neon-green);
  box-shadow: 0 0 25px var(--neon-green-glow);
  padding: 24px;
  width: 90%;
  max-width: 440px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}