:root {
    --bg-color: var(--tg-theme-bg-color, #ffffff);
    --text-color: var(--tg-theme-text-color, #000000);
    --hint-color: var(--tg-theme-hint-color, #999999);
    --link-color: var(--tg-theme-link-color, #2481cc);
    --button-color: var(--tg-theme-button-color, #2481cc);
    --button-text-color: var(--tg-theme-button-text-color, #ffffff);
    --secondary-bg-color: var(--tg-theme-secondary-bg-color, #f0f0f0);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

#app {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    box-sizing: border-box;
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 80vh;
    color: var(--hint-color);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--secondary-bg-color);
    border-top: 4px solid var(--button-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.markdown-body {
    font-size: 16px;
    color: var(--text-color);
}

/* Улучшенные заголовки */
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
    margin-top: 1.5em;
    margin-bottom: 0.8em;
    font-weight: 700;
    line-height: 1.2;
}

/* Markdown rendering styles (Telegram native look) */
#content, #editor-preview {
    font-size: 16px;
    line-height: 1.5;
    word-wrap: break-word;
}

#content p, #editor-preview p {
    margin-bottom: 12px;
}

/* Tables */
.markdown-body table, 
#content table, 
#editor-preview table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 16px;
    display: block;
    overflow-x: auto; /* Horizontal scroll for wide tables */
    border: 1px solid var(--tg-theme-hint-color);
}

.markdown-body th, .markdown-body td,
#content th, #content td,
#editor-preview th, #editor-preview td {
    padding: 8px 12px;
    border: 1px solid var(--tg-theme-hint-color);
    text-align: left;
}

.markdown-body th,
#content th,
#editor-preview th {
    background-color: var(--tg-theme-secondary-bg-color);
    font-weight: bold;
}

/* KaTeX Fonts and Math */
.katex {
    font-size: 1.1em;
}

.katex-display {
    margin: 1em 0;
    overflow-x: auto;
    overflow-y: hidden;
}

/* Code Syntax Highlighting */
pre.hljs {
    background-color: var(--tg-theme-secondary-bg-color);
    border-radius: 8px;
    padding: 12px;
    margin: 12px 0;
    overflow-x: auto;
    border: 1px solid rgba(0,0,0,0.1);
}

code.hljs {
    padding: 0;
    background: transparent;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
}

/* Telegram-like headings */
h1, h2, h3, h4 {
    margin-top: 24px;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--tg-theme-link-color);
}

h1 { font-size: 1.4em; border-bottom: 1px solid var(--tg-theme-hint-color); padding-bottom: 8px; }
h2 { font-size: 1.3em; }
h3 { font-size: 1.2em; }
h4 { font-size: 1.1em; }

/* Horizontal Divider */
hr {
    height: 1px;
    border: none;
    background-color: var(--tg-theme-hint-color);
    margin: 20px 0;
}

/* Mermaid diagrams center */
.mermaid {
    display: flex;
    justify-content: center;
    margin: 20px 0;
    background: white; /* Mermaid often works better on white bg */
    padding: 10px;
    border-radius: 8px;
}

/* Расширенное форматирование */
.markdown-body mark {
    background-color: #ffd33d44;
    color: inherit;
}

.text-red { color: #ff5252; }
.text-green { color: #4caf50; }
.text-blue { color: #2196f3; }
.text-yellow { color: #ffeb3b; }
.text-purple { color: #9c27b0; }

.bg-red { background-color: #ff525222; padding: 2px 4px; border-radius: 3px; }
.bg-green { background-color: #4caf5022; padding: 2px 4px; border-radius: 3px; }
.bg-blue { background-color: #2196f322; padding: 2px 4px; border-radius: 3px; }

/* Кнопки действий */
.action-btn {
    padding: 6px 12px;
    background-color: var(--secondary-bg-color);
    color: var(--text-color);
    border: 1px solid var(--hint-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.action-btn:hover {
    background-color: var(--button-color);
    color: var(--button-text-color);
}

.action-btn.active {
    background-color: var(--button-color);
    color: var(--button-text-color);
    border-color: var(--button-color);
}

/* Toolbar Styles */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px;
    background-color: var(--secondary-bg-color);
    border-radius: 12px;
    margin-bottom: 15px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.toolbar-group {
    display: flex;
    gap: 4px;
    padding-right: 8px;
    border-right: 1px solid var(--hint-color);
}

.toolbar-group:last-child {
    border-right: none;
}

.toolbar-group button {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
    border: 1px solid var(--hint-color);
    border-radius: 6px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s;
    font-weight: bold;
}

.toolbar-group button:hover {
    background-color: var(--button-color);
    color: white;
    border-color: var(--button-color);
}

.toolbar-group button svg {
    width: 18px;
    height: 18px;
}

.save-group {
    margin-left: auto;
}

.save-btn {
    width: auto !important;
    padding: 0 15px !important;
    background-color: #4caf50 !important;
    color: white !important;
    border-color: #43a047 !important;
}

.save-btn:hover {
    background-color: #43a047 !important;
}

/* Editor Styles */
#editor-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#editor-textarea {
    width: 100%;
    min-height: 300px;
    padding: 15px;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 2px solid var(--secondary-bg-color);
    border-radius: 12px;
    font-family: 'Fira Code', 'Courier New', Courier, monospace;
    font-size: 14px;
    line-height: 1.5;
    resize: vertical;
    outline: none;
    box-sizing: border-box;
}

#editor-textarea:focus {
    border-color: var(--button-color);
}

.editor-preview-label {
    font-weight: bold;
    color: var(--hint-color);
    margin-top: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--secondary-bg-color);
}

#editor-preview {
    min-height: 100px;
    padding: 15px;
    background-color: var(--bg-color);
    border: 1px dashed var(--hint-color);
    border-radius: 12px;
}

/* Печать */
@media print {
    #header-actions { display: none !important; }
    body { background-color: white !important; color: black !important; }
    .markdown-body { font-size: 12pt; }
    .action-btn { display: none !important; }
}

/* Responsive Image Scaling */
.markdown-body img, #content img, #editor-preview img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    transition: transform 0.2s;
}

.error {
    text-align: center;
    padding: 20px;
    color: #ff5252;
}

.error button {
    margin-top: 10px;
    padding: 8px 16px;
    background-color: var(--button-color);
    color: var(--button-text-color);
    border: none;
    border-radius: 4px;
    cursor: pointer;
}