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

:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --border-color: #e1e5e9;
    --editor-bg: #ffffff;
    --preview-bg: #fafafa;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #f1f5f9;
    --border-color: #475569;
    --editor-bg: #0f172a;
    --preview-bg: #1e293b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.save-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    background-color: var(--preview-bg);
    border: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-color);
    opacity: 0.8;
    transition: all 0.3s ease;
}

.save-status.editing {
    background-color: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
}

#save-status-icon {
    font-size: 0.9rem;
}

#save-status-text {
    font-weight: 500;
    white-space: nowrap;
}

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

.sidebar-toggle {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    user-select: none;
    display: none;
}

.sidebar-toggle:hover {
    background-color: var(--preview-bg);
}

.export-btn {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    user-select: none;
    position: relative;
    z-index: 1000;
    display: inline-block;
}

.export-btn:hover {
    background-color: var(--preview-bg);
    transform: translateY(-1px);
}

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

.import-btn {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    user-select: none;
    position: relative;
    z-index: 1000;
    display: inline-block;
}

.import-btn:hover {
    background-color: var(--preview-bg);
    transform: translateY(-1px);
}

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

.theme-toggle {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    user-select: none;
    display: inline-block;
    text-align: center;
}

.theme-toggle:hover {
    background-color: var(--preview-bg);
    transform: translateY(-1px);
}

.theme-toggle:active {
    transform: translateY(0);
}

.container {
    flex: 1;
    display: flex;
    height: calc(100vh - 80px);
}

.sidebar {
    width: 300px;
    background-color: var(--bg-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
}

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

.new-note-btn {
    width: 100%;
    background-color: var(--preview-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.new-note-btn:hover {
    background-color: var(--border-color);
}

.search-input {
    width: 100%;
    background-color: var(--editor-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-top: 0.5rem;
    outline: none;
    transition: all 0.3s ease;
}

.search-input:focus {
    border-color: var(--text-color);
    opacity: 0.8;
}

.search-input::placeholder {
    color: var(--text-color);
    opacity: 0.5;
}

.sort-select {
    width: 100%;
    background-color: var(--editor-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-top: 0.5rem;
    outline: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.sort-select:focus {
    border-color: var(--text-color);
    opacity: 0.8;
}

@media (max-width: 768px) {
    .sort-select {
        padding: 0.75rem;
        font-size: 1rem;
        min-height: 44px;
    }
}

.notes-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.note-item {
    padding: 0.75rem;
    margin-bottom: 0.25rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    border: 1px solid transparent;
}

.note-item:hover {
    background-color: var(--preview-bg);
}

.note-item.active {
    background-color: var(--preview-bg);
    border-color: var(--border-color);
}

.note-title {
    font-weight: 500;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
    line-height: 1.2;
}

.note-date {
    font-size: 0.75rem;
    color: var(--text-color);
    opacity: 0.6;
}

.note-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.delete-note-btn {
    background: none;
    border: none;
    color: var(--text-color);
    opacity: 0.5;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 3px;
    font-size: 0.8rem;
    transition: all 0.3s ease;
}

.delete-note-btn:hover {
    opacity: 1;
    background-color: #ef4444;
    color: white;
}

.editor, .preview {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    transition: all 0.3s ease;
}

.editor {
    background-color: var(--editor-bg);
    border-right: 1px solid var(--border-color);
    position: relative;
}

.preview {
    background-color: var(--preview-bg);
}

#editor-content {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    background: var(--editor-bg);
    color: var(--text-color);
    font-size: 1rem;
    line-height: 1.6;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    resize: none;
    transition: background-color 0.3s ease, color 0.3s ease;
    padding-bottom: 3rem;
}

.word-count {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    background-color: var(--preview-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.8rem;
    opacity: 0.7;
    pointer-events: none;
    transition: all 0.3s ease;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}


.preview-content {
    line-height: 1.6;
}

.preview-content h1, .preview-content h2, .preview-content h3 {
    margin-bottom: 0.5rem;
    margin-top: 1rem;
}

.preview-content h1:first-child, .preview-content h2:first-child, .preview-content h3:first-child {
    margin-top: 0;
}

.preview-content p {
    margin-bottom: 1rem;
}

.preview-content ul, .preview-content ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.preview-content code {
    background-color: var(--border-color);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9em;
}

.preview-content pre {
    background-color: var(--border-color);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: 1rem;
}

.save-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 0.5rem 1rem;
    color: white;
    border-radius: 6px;
    font-size: 0.9rem;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 9999;
    transform: translateX(100%);
    pointer-events: none;
}

.save-indicator.show {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
}

.save-indicator.success {
    background-color: #10b981;
}

.save-indicator.info {
    background-color: #3b82f6;
}

.save-indicator.warning {
    background-color: #f59e0b;
}

.save-indicator.error {
    background-color: #ef4444;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-color);
    opacity: 0.7;
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--bg-color);
}

.sidebar.collapsed {
    display: none;
}

@media (max-width: 768px) {
    .sidebar-toggle {
        display: block;
    }

    .container {
        flex-direction: column;
    }
    
    .sidebar {
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        height: calc(100vh - 80px);
        z-index: 100;
        background-color: var(--bg-color);
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        display: none;
    }

    .sidebar.show {
        display: flex;
    }
    
    .editor {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .word-count {
        bottom: 0.5rem;
        right: 0.5rem;
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }
}