v1.0.0 - Initial release

src/app.css

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+@import "tailwindcss";
+
+@font-face {
+    font-family: "Inter";
+    src: local("Inter");
+}
+
+:root {
+    /* Light theme */
+    --bg-primary: #ffffff;
+    --bg-secondary: #f8f9fa;
+    --bg-tertiary: #f0f1f3;
+    --bg-hover: #e9ecef;
+    --bg-active: #dde1e6;
+    --bg-editor: #ffffff;
+    --text-primary: #1a1a2e;
+    --text-secondary: #495057;
+    --text-tertiary: #868e96;
+    --text-accent: #5b6abf;
+    --border-color: #e2e5e9;
+    --border-light: #f0f1f3;
+    --accent: #5b6abf;
+    --accent-hover: #4a59b0;
+    --accent-light: #eef0f9;
+    --danger: #e55353;
+    --danger-hover: #d43d3d;
+    --success: #40c057;
+    --warning: #fab005;
+    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
+    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
+    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
+    --sidebar-width: 220px;
+    --notelist-width: 280px;
+    --panel-resize-handle: 4px;
+}
+
+:root.dark {
+    --bg-primary: #1a1b26;
+    --bg-secondary: #1f2029;
+    --bg-tertiary: #24253a;
+    --bg-hover: #2a2b3d;
+    --bg-active: #33354a;
+    --bg-editor: #1a1b26;
+    --text-primary: #cdd6f4;
+    --text-secondary: #a6adc8;
+    --text-tertiary: #6c7086;
+    --text-accent: #89b4fa;
+    --border-color: #2a2b3d;
+    --border-light: #24253a;
+    --accent: #89b4fa;
+    --accent-hover: #74a8f7;
+    --accent-light: #1e2640;
+    --danger: #f38ba8;
+    --danger-hover: #eba0ac;
+    --success: #a6e3a1;
+    --warning: #f9e2af;
+    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
+    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
+    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
+}
+
+*,
+*::before,
+*::after {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+    -webkit-user-select: none !important;
+    user-select: none !important;
+}
+
+html,
+body {
+    height: 100%;
+    overflow: hidden;
+    font-family: var(
+        --editor-font-family,
+        "Inter",
+        -apple-system,
+        BlinkMacSystemFont,
+        "Segoe UI",
+        sans-serif
+    );
+    background: var(--bg-primary);
+    color: var(--text-primary);
+    font-size: var(--editor-font-size, 14px);
+    line-height: 1.5;
+    -webkit-font-smoothing: antialiased;
+    user-select: none;
+}
+
+/* Scrollbar styling */
+::-webkit-scrollbar {
+    width: 6px;
+    height: 6px;
+}
+
+::-webkit-scrollbar-track {
+    background: transparent;
+}
+
+::-webkit-scrollbar-thumb {
+    background: var(--text-tertiary);
+    border-radius: 3px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+    background: var(--text-secondary);
+}
+
+/* Selection */
+::selection {
+    background: var(--accent);
+    color: white;
+}
+
+/* Focus ring */
+:focus-visible {
+    outline: 2px solid var(--accent);
+    outline-offset: -2px;
+}
+
+/* Allow text selection in editor and source view */
+.editor-content,
+.editor-content *,
+.source-editor {
+    -webkit-user-select: text !important;
+    user-select: text !important;
+}
+
+/* Transitions */
+.transition-colors {
+    transition:
+        color 0.15s ease,
+        background-color 0.15s ease,
+        border-color 0.15s ease;
+}
+
+/* Panel resize handle */
+.resize-handle {
+    width: var(--panel-resize-handle);
+    cursor: col-resize;
+    background: var(--border-color);
+    transition: background 0.15s ease;
+    flex-shrink: 0;
+}
+
+.resize-handle:hover,
+.resize-handle.active {
+    background: var(--accent);
+}