styles.css

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: #333;
}

.app {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 250px;
    min-width: 250px;
    max-width: 250px;
    background-color: #f7f7f7;
    border-right: 1px solid #e0e0e0;
    padding: 20px;
    overflow-y: auto;
    flex-shrink: 0;
}

.sidebar-header {
    margin-bottom: 20px;
}

.page-list {
    position: relative;
    margin-bottom: 20px;
}

#new-page-btn, #reset-btn {
    width: 100%;
    padding: 10px;
    background-color: #e0e0e0;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    margin-bottom: 10px;
    transition: background-color 0.3s ease;
}

#new-page-btn:hover, #reset-btn:hover {
    background-color: #d0d0d0;
}

#reset-btn {
    background-color: #ff4d4f;
    color: white;
}

#reset-btn:hover {
    background-color: #ff7875;
}

.main-content {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    overflow-x: hidden;
    word-wrap: break-word;
}

.content-header {
    margin-bottom: 20px;
}

#page-title {
    font-size: 2em;
    font-weight: bold;
    border: none;
    outline: none;
    width: 100%;
}

.editor {
    outline: none;
    min-height: 200px;
}

.editor:empty:before {
    content: 'Type something...';
    color: #999;
}

.command-palette {
    position: absolute;
    background-color: white;
    border: 1px solid #e0e0e0;
    border-radius: 3px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    padding: 5px 0;
}

.command-item {
    padding: 5px 10px;
    cursor: pointer;
}

.command-item:hover {
    background-color: #f0f0f0;
}

.hidden {
    display: none;
}

.heading1 {
    font-size: 1.8em;
    font-weight: bold;
    margin-top: 1em;
    margin-bottom: 0.5em;
}

.heading2 {
    font-size: 1.5em;
    font-weight: bold;
    margin-top: 0.8em;
    margin-bottom: 0.4em;
}

.bullet-list {
    padding-left: 20px;
    list-style-type: disc;
}

.numbered-list {
    padding-left: 20px;
    list-style-type: decimal;
}

.todo-item {
    display: flex;
    align-items: center;
    margin-bottom: 5px;
}

.todo-item input[type="checkbox"] {
    margin-right: 10px;
}

.search-bar {
    margin-bottom: 15px;
}

.search-bar input {
    width: 100%;
    padding: 5px;
    border: 1px solid #e0e0e0;
    border-radius: 3px;
}

.toolbar {
    margin-bottom: 10px;
}

.toolbar button {
    background: none;
    border: 1px solid #ccc;
    border-radius: 3px;
    cursor: pointer;
    padding: 5px 10px;
    margin-right: 5px;
    font-size: 16px;
}

.toolbar button:hover {
    background-color: #f0f0f0;
}

.toolbar button.active {
    background-color: #e0e0e0;
}

.tags-container {
    margin-top: 10px;
}

#tag-input {
    width: 100%;
    padding: 5px;
    border: 1px solid #e0e0e0;
    border-radius: 3px;
}

#tags-list {
    display: flex;
    flex-wrap: wrap;
    margin-top: 5px;
}

.tag {
    background-color: #e0e0e0;
    border-radius: 3px;
    padding: 2px 5px;
    margin-right: 5px;
    margin-bottom: 5px;
    font-size: 0.9em;
}

.tag .remove-tag {
    margin-left: 5px;
    cursor: pointer;
}

.subpage {
    margin-left: 20px;
    padding: 5px;
    background-color: #f7f7f7;
    border-left: 2px solid #e0e0e0;
    cursor: pointer;
}

.page-list-item {
    padding: 5px 10px;
    margin-bottom: 5px;
    cursor: move;
    background-color: #f0f0f0;
    border-radius: 3px;
    align-items: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.page-list-item.dragging {
    opacity: 0.5;
}

.editor img {
    max-width: 100%;
    height: auto;
}

.todo-list {
    list-style-type: none;
    padding-left: 0;
}

.todo-item {
    display: flex;
    align-items: center;
    margin-bottom: 5px;
}

.todo-item input[type="checkbox"] {
    margin-right: 10px;
}

.todo-item span {
    flex-grow: 1;
}

.delete-page-btn {
    position: absolute;
    right: 5px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    color: #999;
    padding: 2px 5px;
    border-radius: 3px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.delete-page-btn:hover {
    background-color: #ff4d4f;
    color: white;
}

.page-list-item:hover .delete-page-btn {
    visibility: visible;
}

.page-list-item .delete-page-btn {
    visibility: hidden;
}

/* Мобильная версия (экраны до 768px) */
@media (max-width: 768px) {
    .app {
        flex-direction: column;
        height: auto;
    }

    .sidebar {
        width: 100%;
        max-width: none;
        padding: 10px;
        border-right: none;
        border-bottom: 1px solid #e0e0e0;
    }

    .main-content {
        padding: 10px;
    }

    .toolbar {
        flex-wrap: wrap;
        justify-content: space-around;
    }

    .toolbar button {
        margin-bottom: 10px;
        width: 48%;
        box-sizing: border-box;
    }

    #page-title {
        font-size: 1.5em;
    }

    .tags-container {
        margin-top: 10px;
    }

    .page-list-item {
        padding: 10px;
        font-size: 1em;
    }

    .delete-page-btn {
        position: static;
        margin-left: 10px;
    }

    .search-bar input {
        padding: 8px;
    }

    .command-palette {
        width: 100%;
        left: 0;
    }
}

/* Очень маленькие экраны (экраны до 480px) */
@media (max-width: 480px) {
    .toolbar button {
        width: 100%;
        margin-bottom: 5px;
    }

    .page-list-item {
        padding: 8px;
        font-size: 0.9em;
    }

    .search-bar input {
        padding: 6px;
    }
}