/* ==========================================================================
   1. ГЛОБАЛЬНЫЕ ПЕРЕМЕННЫЕ И СБРОС СТИЛЕЙ
   Версия 3.0: Редизайн под "Hub" (корпоративные красно-серые цвета)
   ========================================================================== */
:root {
    /* Палитра - Корпоративный красный */
    --c-primary-main: #ee3523;       /* Основной красный */
    --c-primary-dark: #c0392b;       /* Темно-красный */
    --c-primary-light: #ec867c;      /* Светло-красный */
    --c-primary-bg: #feeeef;         /* Очень светлый фон для активных элементов */
    
    --c-secondary-main: #7f8c8d;     /* Основной серый */
    --c-secondary-dark: #5a6268;     /* Темно-серый */
    --c-secondary-light: #bdc3c7;    /* Светло-серый (линии в дереве) */

    --c-text-main: #2c3e50;          /* Основной цвет текста */
    --c-text-on-primary: #ffffff;    /* Текст на красном фоне */
    --c-text-disabled: #6c757d;      /* Цвет неактивного текста */

    --c-bg-body: #f8f9fa;            /* Фон страницы */
    --c-bg-panel: #ffffff;           /* Фон панелей (сайдбар, шапка) */
    --c-bg-control-hover: #f1f3f5;   /* Фон при наведении на контролы */
    --c-bg-disabled: #e9ecef;        /* Фон неактивных кнопок */
    
    --c-border-main: #dee2e6;        /* Основной цвет границ */
    --c-border-disabled: #ced4da;    /* Граница неактивных кнопок */

    --c-highlight-search: #fff3cd;   /* Подсветка поиска в документе */
    --c-highlight-tree: #ffe082;     /* Подсветка поиска в дереве */
    
    --c-error-main: #c0392b;         /* Цвет для ошибок (темно-красный) */
    --c-error-bg: #feeeef;           /* Фон для ошибок (светло-красный) */

    /* Шрифты */
    --font-primary: 'Roboto', sans-serif;
    --font-secondary: 'Open Sans', sans-serif;

    /* Тени и скругления */
    --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.07);
    --shadow-medium: 0 4px 15px rgba(0, 0, 0, 0.12);
    --radius-main: 6px;
    --radius-large: 10px;

    /* Доступность (a11y) */
    --focus-ring-color: color-mix(in srgb, var(--c-primary-main) 30%, transparent);
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-secondary);
    background-color: var(--c-bg-body);
    color: var(--c-text-main);
    line-height: 1.55;
    font-size: 15px;
}

/* Стиль фокуса для доступности */
input:focus-visible,
textarea:focus-visible,
button:focus-visible,
a.tree-item:focus-visible {
    outline: 2px solid var(--c-primary-main);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px var(--focus-ring-color);
}
input:focus, textarea:focus, button:focus, a.tree-item:focus {
    outline: none;
}

/* ==========================================================================
   2. ОСНОВНОЙ МАКЕТ ПРИЛОЖЕНИЯ
   ========================================================================== */
.app-layout {
    display: flex;
    height: 100vh;
}

/* ==========================================================================
   3. САЙДБАР (БАЗА ЗНАНИЙ)
   ========================================================================== */
.sidebar {
    width: 30%;
    max-width: 380px;
    min-width: 300px;
    background-color: var(--c-bg-panel);
    padding: 20px;
    border-right: 1px solid var(--c-border-main);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-soft);
    overflow-y: auto;
}

.sidebar-header {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--c-border-main);
}

.sidebar-title {
    font-family: var(--font-primary);
    font-size: 1.45em;
    font-weight: 700;
    color: var(--c-text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}
.sidebar-title i {
    font-size: 0.9em;
    color: var(--c-primary-main);
    transition: transform 0.2s ease-in-out;
}
.sidebar-title:hover i {
    transform: scale(1.1) rotate(-5deg);
}

.search-wrapper {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-top: 15px;
}
#treeSearchInput {
    flex-grow: 1;
    padding: 8px 12px;
    border-radius: var(--radius-main);
    border: 1px solid var(--c-border-main);
    font-size: 0.9em;
    background-color: var(--c-bg-body);
    height: 34px;
}
#resetSearchButton {
    flex-shrink: 0;
    background: none;
    border: 1px solid var(--c-border-main);
    color: var(--c-secondary-main);
    padding: 0;
    width: 34px;
    height: 34px;
    cursor: pointer;
    border-radius: var(--radius-main);
    font-size: 0.9em;
    transition: color 0.2s, border-color 0.2s, transform 0.1s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
#resetSearchButton:hover {
    color: var(--c-primary-main);
    border-color: var(--c-primary-main);
    transform: scale(1.05);
}

/* --- Структура дерева --- */
.document-tree {
    flex-grow: 1;
    font-size: 0.92em;
}
.document-tree ul {
    list-style: none;
    padding-left: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
    position: relative;
}
.document-tree ul ul { 
    padding-left: 20px; 
    max-height: 0;
}
.document-tree ul li { position: relative; }

/* Линии-связи в дереве */
.document-tree ul ul::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 1px;
    background-color: var(--c-secondary-light);
    transform: translateX(9px);
}
.document-tree ul li::before {
    content: "";
    position: absolute;
    left: -11px;
    top: 16px;
    width: 10px;
    height: 1px;
    background-color: var(--c-secondary-light);
}
.document-tree > ul > li::before { display: none; }
.document-tree ul li:last-child > ul::before { height: 18px; }

/* --- Элементы дерева --- */
.document-tree .tree-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 10px;
    border-radius: var(--radius-main);
    text-decoration: none;
    color: var(--c-text-main);
    transition: background-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
    cursor: pointer;
    white-space: normal;
    line-height: 1.4;
    position: relative;
}
.document-tree .tree-item:hover {
    background-color: var(--c-bg-control-hover);
    color: var(--c-primary-main);
    transform: translateX(2px);
}
.document-tree .tree-item.active:hover { transform: none; }

/* Состояния элемента дерева */
.document-tree .tree-item.active {
    background-color: var(--c-primary-main);
    color: var(--c-text-on-primary);
    font-weight: 500;
}
.document-tree .tree-item.active-parent {
    background-color: var(--c-primary-light);
    color: var(--c-primary-dark);
    font-weight: 500;
}
.document-tree .tree-item.active .fa-fw,
.document-tree .tree-item.active .tree-item-toggle {
    color: var(--c-text-on-primary);
}
.document-tree .tree-item.active-parent .fa-fw,
.document-tree .tree-item.active-parent .tree-item-toggle {
    color: var(--c-primary-dark);
}

.document-tree .tree-item .fa-fw {
    color: var(--c-secondary-main);
    width: 1.3em;
    text-align: center;
    flex-shrink: 0;
    transition: transform 0.2s ease;
}
.document-tree .tree-item:hover .fa-fw { transform: scale(1.1); }
.document-tree .tree-item.active:hover .fa-fw { transform: none; }
.document-tree .item-text { flex-grow: 1; word-break: break-word; }
.document-tree .has-children > .tree-item .item-text { font-weight: 500; }
.document-tree .tree-item mark {
    background-color: var(--c-highlight-tree);
    color: var(--c-text-main);
    padding: 0.1em 0;
    border-radius: 2px;
    font-weight: bold;
}

/* Переключатель вложенности */
.document-tree .tree-item-toggle {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    color: var(--c-secondary-main);
    transition: transform 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.document-tree .has-children.open > .tree-item > .tree-item-toggle {
    transform: translateY(-50%) rotate(90deg);
}

/* Кнопка просмотра документа */
.view-doc-btn {
    position: absolute;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    pointer-events: none;
    background: none;
    border: none;
    padding: 0;
    width: 24px;
    height: 24px;
    cursor: pointer;
    border-radius: 4px;
    transition: opacity 0.15s, background-color 0.15s, transform 0.15s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: inherit;
}
.document-tree .tree-item:hover .view-doc-btn,
.document-tree .tree-item.active .view-doc-btn,
.document-tree .tree-item.active-parent .view-doc-btn {
    opacity: 1;
    pointer-events: auto;
}
.view-doc-btn:hover:not(.no-action) {
    transform: translateY(-50%) scale(1.15);
    background-color: color-mix(in srgb, currentColor 10%, transparent);
}
.view-doc-btn.no-action {
    opacity: 0.3 !important;
    cursor: default !important;
}

.hidden-by-search { display: none !important; }

/* ==========================================================================
   4. ОБЛАСТЬ ЧАТА
   ========================================================================== */
.chat-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--c-bg-body);
}
.chat-header {
    background-color: var(--c-bg-panel);
    padding: 12px 20px;
    border-bottom: 1px solid var(--c-border-main);
    box-shadow: var(--shadow-soft);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
    gap: 15px;
}
.chat-title-wrapper {
    display: flex;
    flex-direction: column;
    min-width: 0;
}
.chat-title {
    font-family: var(--font-primary);
    font-size: 1.35em;
    font-weight: 700;
    color: var(--c-primary-main);
}
.current-prompt-info {
    font-size: 0.8em;
    color: var(--c-secondary-main);
    margin-top: 2px;
    font-style: italic;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.current-prompt-info.loading-state::after {
    content: " (загрузка...)";
}

/* --- Содержимое чата --- */
.chat-content {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    background-color: var(--c-bg-panel);
    position: relative;
}

/* Приветственное сообщение */
.welcome-message-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--c-secondary-main);
    padding: 20px;
}
.welcome-message-container .welcome-icon {
    font-size: 3.5em;
    color: var(--c-primary-main);
    margin-bottom: 20px;
    animation: welcomeIconPulse 2.5s infinite ease-in-out;
}
@keyframes welcomeIconPulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
    100% { transform: scale(1); opacity: 1; }
}
.welcome-message-container h3 {
    font-family: var(--font-primary);
    font-size: 1.3em;
    color: var(--c-text-main);
    margin-bottom: 10px;
}
.welcome-message-container p { font-size: 0.95em; line-height: 1.6; max-width: 500px; margin-bottom: 8px; }
.welcome-message-container ul { list-style: none; padding-left: 0; text-align: left; max-width: 480px; margin: 15px auto; }
.welcome-message-container ul li { margin-bottom: 8px; padding-left: 25px; position: relative; }
.welcome-message-container ul li::before {
    content: "\f058";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    position: absolute;
    left: 0;
    top: 2px;
    color: var(--c-primary-main);
}

/* --- Сообщения --- */
.message {
    display: flex;
    margin-bottom: 16px;
    animation: messageFadeIn 0.3s ease-out;
    align-items: flex-start;
    gap: 10px;
}
@keyframes messageFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.user-message { justify-content: flex-end; }
.assistant-message { justify-content: flex-start; }

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    color: var(--c-text-on-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1em;
    flex-shrink: 0;
    margin-top: 2px;
    transition: transform 0.2s ease;
}
.message:hover .message-avatar { transform: scale(1.08); }
.user-message .message-avatar { background-color: var(--c-primary-main); }
.assistant-message .message-avatar { background-color: var(--c-secondary-main); }

.message-content-wrapper {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: relative;
    max-width: 78%;
}
.user-message .message-content-wrapper { align-items: flex-end; }

.message-bubble {
    padding: 10px 16px;
    border-radius: var(--radius-large);
    word-wrap: break-word;
    line-height: 1.5;
    box-shadow: var(--shadow-soft);
    font-size: 0.95em;
}
.user-message .message-bubble {
    background-color: var(--c-primary-main);
    color: var(--c-text-on-primary);
    border-bottom-right-radius: 3px;
}
.assistant-message .message-bubble {
    background-color: var(--c-bg-control-hover);
    color: var(--c-text-main);
    border-bottom-left-radius: 3px;
}
.error-message .message-bubble {
    background-color: var(--c-error-bg);
    color: var(--c-error-main);
    font-weight: 500;
    border: 1px solid var(--c-error-main);
}

.copy-message-btn {
    position: absolute;
    bottom: 8px;
    right: -38px;
    background: var(--c-bg-control-hover);
    color: var(--c-secondary-main);
    border: 1px solid var(--c-border-main);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    font-size: 0.8em;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s, background-color 0.2s, transform 0.15s;
    padding: 0;
    z-index: 1;
}
.assistant-message .message-content-wrapper:hover .copy-message-btn { opacity: 1; }
.copy-message-btn:hover { background-color: var(--c-border-main); color: var(--c-text-main); transform: scale(1.1); }
.copy-message-btn.copied { background-color: var(--c-primary-light); color: var(--c-primary-main); transform: scale(1.05); }

/* Стиль контента в markdown */
.message-bubble .markdown-content p:last-child { margin-bottom: 0; }
.message-bubble .markdown-content ul, .message-bubble .markdown-content ol { margin-left: 20px; margin-bottom: 10px; }
.message-bubble .markdown-content code { background-color: #e9ecef; padding: 0.1em 0.4em; border-radius: 3px; font-family: 'Courier New', Courier, monospace; font-size: 0.9em; }
.message-bubble .markdown-content pre { background-color: #e9ecef; padding: 10px; border-radius: var(--radius-main); overflow-x: auto; margin-bottom: 10px; }
.message-bubble .markdown-content pre code { background-color: transparent; padding: 0; font-size: 0.85em; }
.message-bubble .markdown-content blockquote { border-left: 3px solid var(--c-border-main); padding-left: 10px; margin-left: 0; margin-bottom: 10px; color: var(--c-secondary-dark); }
    
/* --- Блок источников (Sources) --- */
.sources-container {
    margin-top: 15px;
    border-top: 1px dashed var(--c-border-main);
    padding-top: 10px;
    font-size: 0.85em;
    width: 100%;
}
.sources-container summary {
    font-family: var(--font-primary);
    font-weight: 500;
    color: var(--c-secondary-dark);
    margin-bottom: 8px;
    font-size: 0.95em;
    cursor: pointer;
    user-select: none;
    transition: color 0.2s;
}
.sources-container summary:hover {
    color: var(--c-primary-main);
}
.sources-container summary i {
    margin-right: 6px;
    color: var(--c-secondary-main);
}
.sources-container[open] > summary {
    margin-bottom: 10px;
}
.source-doc-group {
    margin-bottom: 12px;
    border: 1px solid var(--c-border-main);
    border-radius: var(--radius-main);
    background-color: var(--c-bg-body);
    padding: 10px 12px;
}
.source-doc-header {
    font-size: 0.9em;
    font-weight: 700;
    color: var(--c-text-main);
    margin: 0 0 8px 0;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--c-border-main);
}
.source-doc-header i {
    margin-right: 6px;
    color: var(--c-primary-main);
}
.sources-list-grouped {
    list-style: none;
    padding-left: 0;
    max-height: 200px;
    overflow-y: auto;
}
.sources-list-grouped .source-item {
    padding: 8px 4px;
    border-bottom: 1px dashed var(--c-border-disabled);
}
.sources-list-grouped .source-item:last-child {
    border-bottom: none;
}
.source-item-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9em;
    color: var(--c-secondary-dark);
    margin-bottom: 5px;
    font-style: italic;
}
.source-similarity {
    font-weight: bold;
    color: var(--c-secondary-main);
}
.source-item-text {
    margin: 0;
    color: var(--c-text-disabled);
    line-height: 1.4;
    font-size: 0.9em;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Индикатор загрузки */
.loading-indicator {
    display: none;
    position: sticky;
    bottom: 15px;
    left: 20px;
    color: var(--c-secondary-main);
    font-size: 0.9em;
    padding: 5px 0;
    z-index: 5;
}
.loading-indicator .dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: var(--c-secondary-main);
    border-radius: 50%;
    margin: 0 2px;
    animation: loadingDots 1.4s infinite ease-in-out both;
}
.loading-indicator .dot:nth-child(1) { animation-delay: -0.32s; }
.loading-indicator .dot:nth-child(2) { animation-delay: -0.16s; }
@keyframes loadingDots {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}

/* --- Область ввода --- */
.input-area-wrapper {
    background-color: var(--c-bg-panel);
    padding: 12px 20px;
    border-top: 1px solid var(--c-border-main);
    box-shadow: 0 -2px 8px rgba(0,0,0,0.04);
}
.input-area {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}
textarea#user_input {
    flex-grow: 1;
    padding: 10px 15px;
    border-radius: var(--radius-main);
    border: 1px solid var(--c-border-main);
    background-color: var(--c-bg-body);
    resize: none;
    min-height: 44px;
    max-height: 160px;
    font-family: var(--font-secondary);
    font-size: 0.95em;
    color: var(--c-text-main);
}
textarea#user_input::placeholder {
    color: var(--c-secondary-main);
    opacity: 0.8;
}
/* Подсветка поля ввода при ошибке */
textarea.error-pulse {
    animation: error-pulse 0.5s ease;
    border-color: var(--c-error-main) !important;
}
@keyframes error-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.01); }
}

/* ==========================================================================
   5. ОБЩИЕ КОМПОНЕНТЫ (КНОПКИ, МОДАЛЬНЫЕ ОКНА)
   ========================================================================== */

/* --- Кнопки --- */
button {
    padding: 0 18px;
    height: 44px;
    border-radius: var(--radius-main);
    border: none;
    cursor: pointer;
    transition: background-color 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
    font-family: var(--font-primary);
    font-size: 0.9em;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
button:not(:disabled):active {
    transform: scale(0.97);
    transition-duration: 0.05s;
}
button:disabled, button[disabled] {
    background-color: var(--c-bg-disabled) !important;
    color: var(--c-text-disabled) !important;
    border: 1px solid var(--c-border-disabled) !important;
    cursor: not-allowed !important;
    box-shadow: none !important;
    transform: none !important;
}

.input-area button {
    background-color: var(--c-primary-main);
    color: var(--c-text-on-primary);
    min-width: 100px;
}
.input-area button:hover:not(:disabled) {
    background-color: var(--c-primary-dark);
    box-shadow: var(--shadow-soft);
}
.input-area button .fa-paper-plane { margin-right: 7px; font-size: 0.9em; }

.chat-controls { display: flex; gap: 10px; }
.action-btn {
    background-color: var(--c-secondary-main);
    color: var(--c-text-on-primary);
    height: 38px;
    font-size: 0.85em;
}
.action-btn:hover:not(:disabled) {
    background-color: var(--c-secondary-dark);
    box-shadow: var(--shadow-soft);
}
.reset-btn { background-color: var(--c-primary-main); }

/* --- Модальные окна --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1050;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(44, 62, 80, 0.65);
    animation: fadeInModal 0.3s ease;
}
@keyframes fadeInModal { from { opacity: 0; } to { opacity: 1; } }

.modal-content {
    background-color: var(--c-bg-panel);
    margin: 5vh auto;
    padding: 25px 30px;
    width: 90%;
    max-width: 650px;
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-medium);
    position: relative;
    animation: slideInModal 0.3s ease-out;
}
@keyframes slideInModal {
    from { transform: translateY(-25px) scale(0.98); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--c-border-main);
}
.modal-title {
    font-family: var(--font-primary);
    font-size: 1.35em;
    font-weight: 500;
    color: var(--c-primary-main);
}
.close-modal-btn {
    background: none;
    border: none;
    font-size: 1.9em;
    line-height: 1;
    color: var(--c-secondary-main);
    cursor: pointer;
    padding: 0;
    height: auto;
    transition: color 0.2s, transform 0.2s;
}
.close-modal-btn:hover {
    color: var(--c-primary-main);
    background: none;
    box-shadow: none;
    transform: rotate(90deg) scale(1.1);
}

/* Модальное окно инструкций */
#model_instructions {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border-radius: var(--radius-main);
    border: 1px solid var(--c-border-main);
    background-color: var(--c-bg-body);
    resize: vertical;
    min-height: 200px;
    font-family: var(--font-secondary);
    font-size: 0.92em;
    line-height: 1.5;
    color: var(--c-text-main);
}
.modal-footer { text-align: right; }
.modal-footer button {
    background-color: var(--c-primary-main);
    color: var(--c-text-on-primary);
    min-width: 120px;
    height: 42px;
}
.modal-footer button:hover:not(:disabled) {
    background-color: var(--c-primary-dark);
    box-shadow: var(--shadow-soft);
}

/* ==========================================================================
   6. ПРОСМОТРЩИК ДОКУМЕНТОВ
   ========================================================================== */
.modal-content.document-viewer-content {
    max-width: 85%;
    width: 85%;
    height: 90vh;
    display: flex;
    flex-direction: column;
    padding: 20px;
}
.document-viewer-main-area {
    display: flex; 
    flex-grow: 1;
    overflow: hidden; 
    margin-top: 10px; 
}

.document-viewer-toolbar {
    padding-bottom: 10px;
    border-bottom: 1px solid var(--c-border-main);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    flex-wrap: wrap;
}
.pdf-viewer-info {
    padding-bottom: 10px;
    margin-bottom: 10px;
    border-bottom: 1px solid var(--c-border-main);
    font-size: 0.9em;
    color: var(--c-secondary-dark);
    text-align: center;
    flex-shrink: 0;
}
#documentSearchInput {
    flex-grow: 1;
    padding: 8px 12px;
    height: 34px;
    border-radius: var(--radius-main);
    border: 1px solid var(--c-border-main);
    font-size: 0.9em;
}
.doc-search-nav-btn {
    background: var(--c-bg-control-hover);
    border: 1px solid var(--c-border-main);
    color: var(--c-secondary-main);
    padding: 0 8px;
    height: 34px;
    border-radius: var(--radius-main);
    cursor: pointer;
    flex-shrink: 0;
    transition: background-color 0.15s, color 0.15s, transform 0.1s;
}
.doc-search-nav-btn:hover:not(:disabled) {
    background-color: var(--c-border-main);
    color: var(--c-text-main);
    transform: translateY(-1px);
}
#documentSearchStatus { font-size: 0.85em; color: var(--c-secondary-main); white-space: nowrap; }
#docSearchReset { margin-left: auto; }

.document-viewer-body {
    flex-grow: 1; 
    height: 100%; 
    overflow-y: auto;
    font-size: 0.9em;
    line-height: 1.6;
    padding: 15px; 
    background-color: var(--c-bg-body);
    border-radius: var(--radius-main);
    border: 1px solid var(--c-border-main);
}

/* Стили для поиска в документе (объединены) */
.document-viewer-body mark.doc-search-highlight {
    background-color: var(--c-highlight-search);
    padding: 0.1em 0;
    border-radius: 2px;
    color: var(--c-text-main);
    font-weight: bold;
}
.document-viewer-body mark.current-match {
    background-color: #ffc107;
    outline: 1px solid #e0a800;
}

.document-viewer-body table { border-collapse: collapse; width: 100%; margin-bottom: 1em; font-size: 0.9em; }
.document-viewer-body th, .document-viewer-body td { border: 1px solid #ccc; padding: 0.4em 0.6em; text-align: left; vertical-align: top; }
.document-viewer-body th { background-color: #f0f0f0; font-weight: bold; }
.document-viewer-body p { margin-bottom: 0.8em; }
.document-viewer-body h1, .document-viewer-body h2, .document-viewer-body h3, .document-viewer-body h4, .document-viewer-body h5, .document-viewer-body h6 { margin-top: 1.2em; margin-bottom: 0.6em; font-family: var(--font-primary); font-weight: 500; line-height: 1.3; }
.document-viewer-body h1 { font-size: 1.6em; } 
.document-viewer-body h2 { font-size: 1.4em; }
.document-viewer-body h3 { font-size: 1.25em; }
.document-viewer-body ul, .document-viewer-body ol { margin-left: 25px; margin-bottom: 0.8em; }
.document-viewer-body li { margin-bottom: 0.3em; }

#pdfViewerIframe {
    flex-grow: 1;
    width: 100%;
    border: none;
}

/* ==========================================================================
   7. АДАПТИВНОСТЬ (MEDIA QUERIES)
   ========================================================================== */
@media (max-width: 992px) {
    .sidebar { width: 40%; min-width: 280px; }
    .chat-title-wrapper { max-width: calc(100% - 200px); }
    .assistant-message .message-content-wrapper:hover .copy-message-btn { right: 5px; bottom: 5px; opacity: 0.8; }
    .modal-content.document-viewer-content { width: 90%; max-width: 90%; }
}

@media (max-width: 768px) {
    .app-layout { flex-direction: column; }
    .sidebar {
        width: 100%;
        max-width: none;
        height: auto;
        max-height: 45vh;
        border-right: none;
        border-bottom: 1px solid var(--c-border-main);
        padding: 15px;
    }
    .sidebar-title { font-size: 1.2em; }
    .chat-area { height: calc(100vh - 45vh); }
    .chat-header { padding: 10px 15px; }
    .chat-title { font-size: 1.1em; }
    .current-prompt-info { max-width: 150px; font-size: 0.75em; }
    .chat-content { padding: 15px; }
    .input-area-wrapper { padding: 10px 15px; }
    textarea#user_input, .input-area button { height: 42px; font-size: 0.9em; }
    .action-btn { height: 36px; padding: 0 12px; font-size: 0.8em; }
    .message-content-wrapper { max-width: 90%; }
    .message-bubble { font-size: 0.9em; }
    .assistant-message .message-content-wrapper:hover .copy-message-btn,
    .assistant-message .copy-message-btn { right: 5px; bottom: 5px; opacity: 0.6; }
    .assistant-message .message-content-wrapper:hover .copy-message-btn { opacity: 1; }
    .modal-content { width: 95%; }
    .modal-content.document-viewer-content { width: 95%; max-width: 95%; height: 90vh; }
    #docSearchReset { margin-left: 0; }
    .document-tree .tree-item { padding-right: 55px; }
    .document-tree .tree-item-toggle { right: 2px; }
    .view-doc-btn { right: 25px; }
}