:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-main: #f8fafc;
    --sidebar-bg: #1e293b;
    --sidebar-text: #f1f5f9;
    --sidebar-hover: #334155;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --danger-color: #ef4444;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.5;
}

.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar Styling */
.sidebar {
    width: 280px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    box-shadow: 4px 0 10px rgba(0,0,0,0.1);
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--sidebar-hover);
}

.sidebar-header h1 {
    font-size: 1.5rem;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--white);
}

.sidebar-actions {
    padding: 16px;
}

#new-note-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
}

#new-note-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

#contact-btn {
    width: 100%;
    padding: 12px;
    background-color: transparent;
    color: var(--sidebar-text);
    border: 1px solid var(--sidebar-hover);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 10px;
    transition: all 0.2s;
}

#contact-btn:hover {
    background-color: var(--sidebar-hover);
}

.note-list {
    flex: 1;
    list-style: none;
    padding: 8px;
    margin: 0;
    overflow-y: auto;
}

.note-list li {
    margin-bottom: 4px;
}

.note-list li a {
    display: block;
    padding: 12px 16px;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: 6px;
    transition: background 0.2s;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.note-list li a:hover {
    background-color: var(--sidebar-hover);
}

.note-list li.active a {
    background-color: var(--sidebar-hover);
    border-left: 4px solid var(--primary-color);
}

/* Main Content Styling */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.content-header {
    background-color: var(--white);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

#note-title {
    flex: 1;
    border: none;
    font-size: 1.5rem;
    font-weight: 700;
    outline: none;
    color: var(--text-main);
}

.header-actions {
    display: flex;
    gap: 12px;
}

.header-actions button {
    padding: 8px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

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

.btn-danger {
    background-color: var(--white);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

.btn-danger:hover {
    background-color: var(--danger-color);
    color: white;
}

/* Workspace Layout */
.workspace {
    flex: 1;
    display: flex;
    overflow: hidden;
    padding: 20px;
    gap: 20px;
}

.editor-pane, .preview-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

/* EasyMDE Customization */
.CodeMirror {
    border: none !important;
    height: 100% !important;
    font-family: 'Fira Code', monospace;
    font-size: 1rem;
}

.editor-toolbar {
    border: none !important;
    border-bottom: 1px solid var(--border-color) !important;
    padding: 8px !important;
}

/* Preview Pane */
.preview-header {
    padding: 12px 20px;
    background-color: #f1f5f9;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
}

.markdown-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

/* Contact Section Styles */
.contact-pane {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px 20px;
    overflow-y: auto;
}

.contact-container {
    background-color: var(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    max-width: 600px;
    width: 100%;
    border: 1px solid var(--border-color);
}

.contact-container h2 {
    margin-top: 0;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.contact-container p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary-color);
}

/* Markdown Styling */
.markdown-body h1 { font-size: 2rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; margin-bottom: 16px; }
.markdown-body h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; margin-top: 24px; margin-bottom: 16px; }
.markdown-body blockquote { border-left: 4px solid var(--border-color); padding-left: 16px; color: var(--text-muted); font-style: italic; }
.markdown-body pre { background-color: #f1f5f9; padding: 16px; border-radius: 8px; overflow-x: auto; }
.markdown-body code { background-color: #f1f5f9; padding: 0.2em 0.4em; border-radius: 4px; font-size: 85%; }

/* Scrollbar Styling */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }