/* ============================================================
   AI Script Generator — Web Edition
   Стили интерфейса с поддержкой тёмной/светлой темы
   ============================================================ */

/* === CSS-переменные (тёмная тема по умолчанию) === */
:root,
[data-theme="dark"] {
    /* Основные цвета */
    --color-bg-primary: #1a1a2e;
    --color-bg-secondary: #16213e;
    --color-bg-tertiary: #0f3460;
    --color-bg-hover: #1e2a4a;
    --color-bg-active: #253a5e;

    /* Поверхности */
    --color-surface: #1e2640;
    --color-surface-raised: #243050;
    --color-surface-overlay: rgba(0, 0, 0, 0.6);

    /* Текст */
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #a0a8b8;
    --color-text-muted: #6b7280;
    --color-text-inverse: #1a1a2e;

    /* Акценты */
    --color-accent: #4f8cff;
    --color-accent-hover: #6ba0ff;
    --color-accent-active: #3a7aef;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-error: #f87171;

    /* Границы */
    --color-border: #2d3748;
    --color-border-light: #374151;

    /* Тени */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);

    /* Скругления */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Шрифты */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;

    /* Размеры layout */
    --sidebar-width: 280px;
    --project-panel-width: 320px;
    --chat-max-width: 900px;
    --header-height: 56px;
    --input-area-min-height: 70px;

    /* Переходы */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* === Светлая тема === */
[data-theme="light"] {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #e2e8f0;
    --color-bg-hover: #f1f5f9;
    --color-bg-active: #e2e8f0;

    --color-surface: #ffffff;
    --color-surface-raised: #f8fafc;
    --color-surface-overlay: rgba(0, 0, 0, 0.4);

    --color-text-primary: #1e293b;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
    --color-text-inverse: #ffffff;

    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-accent-active: #1d4ed8;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

/* === Сброс и базовые стили === */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    height: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    height: 100%;
    overflow: hidden;
    line-height: 1.5;
}

/* === Layout: основной контейнер === */
.app-container {
    display: flex;
    /* 100vh — запасной вариант для старых браузеров,
       100dvh — динамическая высота (не обрезает низ на мобильных) */
    height: 100vh;
    height: 100dvh;
    width: 100%;
    overflow: hidden;
}

/* ============================================================
   БОКОВАЯ ПАНЕЛЬ (Sidebar)
   ============================================================ */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    height: 100vh;
    height: 100dvh;
    background-color: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal), width var(--transition-normal);
    z-index: 100;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sidebar-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-accent);
}

.sidebar-search {
    padding: 8px 16px;
}

.input-search {
    width: 100%;
    padding: 8px 12px;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    outline: none;
    transition: border-color var(--transition-fast);
}

.input-search:focus {
    border-color: var(--color-accent);
}

.sessions-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.session-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
    margin-bottom: 2px;
    gap: 8px;
}

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

.session-item.active {
    background-color: var(--color-bg-active);
}

.session-item-title {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.session-item-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    white-space: nowrap;
}

.session-item-actions {
    display: none;
    gap: 4px;
}

.session-item:hover .session-item-actions {
    display: flex;
}

.session-item-actions .btn-icon {
    width: 24px;
    height: 24px;
    font-size: var(--font-size-xs);
}

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ============================================================
   ОСНОВНАЯ ОБЛАСТЬ (Main Content)
   ============================================================ */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    min-width: 0;
    background-color: var(--color-bg-primary);
}

/* === Шапка чата === */
.chat-header {
    height: var(--header-height);
    min-height: var(--header-height);
    padding: 0 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-secondary);
}

.chat-header-info {
    flex: 1;
    min-width: 0;
}

.chat-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-model {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.chat-header-actions {
    display: flex;
    gap: 4px;
}

.btn-sidebar-toggle {
    display: none;
}

/* === Область сообщений === */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
}

.messages-list {
    max-width: var(--chat-max-width);
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex: 1;
}

/* === Приветственный экран === */
.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    text-align: center;
    padding: 40px 20px;
}

.welcome-message h2 {
    font-size: var(--font-size-xl);
    color: var(--color-accent);
    margin-bottom: 8px;
}

.welcome-message p {
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

.welcome-hints {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.hint-card {
    padding: 10px 16px;
    background-color: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.hint-card:hover {
    border-color: var(--color-accent);
    background-color: var(--color-bg-hover);
}

/* === Сообщения === */
.message {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    max-width: 85%;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message-user {
    align-self: flex-end;
    background-color: var(--color-accent);
    color: var(--color-text-inverse);
    border-bottom-right-radius: var(--radius-sm);
}

.message-assistant {
    align-self: flex-start;
    background-color: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-bottom-left-radius: var(--radius-sm);
}

.message-role {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.7;
}

.message-content {
    font-size: var(--font-size-base);
    line-height: 1.6;
}

/* Markdown в сообщениях */
.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content ul,
.message-content ol {
    padding-left: 20px;
    margin-bottom: 8px;
}

.message-content li {
    margin-bottom: 4px;
}

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4 {
    margin-top: 12px;
    margin-bottom: 6px;
    font-weight: 600;
}

.message-content h1 { font-size: 1.3em; }
.message-content h2 { font-size: 1.2em; }
.message-content h3 { font-size: 1.1em; }

/* Блоки кода */
.message-content pre {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px;
    margin: 8px 0;
    overflow-x: auto;
    position: relative;
}

.message-content code {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
}

.message-content :not(pre) > code {
    background-color: var(--color-bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

/* Кнопка "Копировать код" */
.code-block-wrapper {
    position: relative;
}

.code-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 12px;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-bottom: none;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.code-block-header + pre {
    margin-top: 0;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}

.btn-copy-code {
    padding: 2px 8px;
    font-size: var(--font-size-xs);
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.btn-copy-code:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-copy-code.copied {
    color: var(--color-success);
    border-color: var(--color-success);
}

/* === Индикатор печати === */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    max-width: var(--chat-max-width);
    width: 100%;
    margin: 0 auto;
}

.typing-dots {
    display: flex;
    gap: 4px;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    background-color: var(--color-accent);
    border-radius: 50%;
    animation: typing-bounce 1.4s infinite both;
}

.typing-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing-bounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-4px);
        opacity: 1;
    }
}

.typing-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* === Область ввода === */
.input-area {
    padding: 12px 16px;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg-secondary);
}

.input-row {
    max-width: var(--chat-max-width);
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 8px;
}

/* Кнопки в строке ввода не должны сжиматься:
   при нехватке места flex сжимал кнопку «Отправить» и обрезала стрелку */
.input-row .btn {
    flex-shrink: 0;
}

.input-message {
    flex: 1;
    min-width: 0; /* textarea может сжиматься — кнопки всегда видны полностью */
    padding: 10px 14px;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    resize: none;
    outline: none;
    max-height: 200px;
    min-height: 42px;
    line-height: 1.5;
    transition: border-color var(--transition-fast);
}

.input-message:focus {
    border-color: var(--color-accent);
}

.input-message:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* === Прикреплённые файлы === */
.attached-files {
    max-width: var(--chat-max-width);
    margin: 0 auto 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.attached-file-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background-color: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.attached-file-item .btn-remove {
    cursor: pointer;
    color: var(--color-text-muted);
    background: none;
    border: none;
    font-size: var(--font-size-sm);
    line-height: 1;
    padding: 0;
    transition: color var(--transition-fast);
}

.attached-file-item .btn-remove:hover {
    color: var(--color-error);
}

/* ============================================================
   ПАНЕЛЬ ФАЙЛОВ ПРОЕКТА
   ============================================================ */
.project-panel {
    width: var(--project-panel-width);
    min-width: var(--project-panel-width);
    height: 100vh;
    height: 100dvh;
    background-color: var(--color-bg-secondary);
    border-left: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal);
}

.project-panel-header {
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-panel-header h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
}

.project-tree {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.tree-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: background-color var(--transition-fast);
}

.tree-item:hover {
    background-color: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.tree-item-icon {
    font-size: var(--font-size-base);
    width: 20px;
    text-align: center;
}

.tree-item-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tree-item-dir {
    font-weight: 500;
}

.project-panel-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--color-border);
}

/* ============================================================
   КНОПКИ
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    font-family: var(--font-family);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast), opacity var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-text-inverse);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-accent-hover);
}

.btn-primary:active:not(:disabled) {
    background-color: var(--color-accent-active);
}

.btn-secondary {
    background-color: var(--color-surface-raised);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-bg-hover);
    border-color: var(--color-border-light);
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    background: none;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.btn-icon:hover:not(:disabled) {
    background-color: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.btn-icon:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-danger {
    background-color: var(--color-error);
    color: #fff;
}

.btn-danger:hover:not(:disabled) {
    opacity: 0.9;
}

.btn-new-session {
    width: 100%;
    padding: 10px;
}

.btn-send {
    /* width: 42px; */
    height: 42px;
    padding: 0;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
}

/* ============================================================
   ФОРМЫ И ИНПУТЫ
   ============================================================ */
.input {
    width: 100%;
    padding: 8px 12px;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    outline: none;
    transition: border-color var(--transition-fast);
}

.input:focus {
    border-color: var(--color-accent);
}

select.input {
    cursor: pointer;
}

textarea.input {
    resize: vertical;
    min-height: 80px;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}

/* ============================================================
   МОДАЛЬНЫЕ ОКНА
   ============================================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-surface-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fade-in var(--transition-fast);
}

.modal {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 480px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    animation: slide-up var(--transition-normal);
}

.modal-large {
    max-width: 680px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 12px 20px;
    border-top: 1px solid var(--color-border);
}

/* ============================================================
   ВКЛАДКИ (Tabs)
   ============================================================ */
.settings-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 8px;
}

.tab {
    padding: 6px 14px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.tab:hover {
    color: var(--color-text-primary);
    background-color: var(--color-bg-hover);
}

.tab.active {
    color: var(--color-accent);
    background-color: var(--color-bg-active);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ============================================================
   ПРОМПТЫ (в настройках)
   ============================================================ */
.prompts-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 12px;
}

.prompt-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.prompt-item-info {
    flex: 1;
    min-width: 0;
}

.prompt-item-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.prompt-item-preview {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.prompt-item-badge {
    font-size: var(--font-size-xs);
    padding: 2px 6px;
    background-color: var(--color-accent);
    color: var(--color-text-inverse);
    border-radius: var(--radius-full);
}

/* ============================================================
   СКРОЛЛБАР
   ============================================================ */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: 3px;
}

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

/* ============================================================
   АНИМАЦИИ
   ============================================================ */
@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slide-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes message-appear {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message {
    animation: message-appear var(--transition-normal);
}

/* ============================================================
   УВЕДОМЛЕНИЯ (Toast)
   ============================================================ */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: #fff;
    box-shadow: var(--shadow-md);
    animation: slide-up var(--transition-normal);
    max-width: 320px;
}

.toast-success {
    background-color: var(--color-success);
}

.toast-error {
    background-color: var(--color-error);
}

.toast-warning {
    background-color: var(--color-warning);
    color: #1a1a2e;
}

/* ============================================================
   АДАПТИВНОСТЬ (мобильные устройства)
   ============================================================ */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .btn-sidebar-toggle {
        display: flex;
    }

    .project-panel {
        position: fixed;
        top: 0;
        right: 0;
        transform: translateX(100%);
        box-shadow: var(--shadow-lg);
    }

    .project-panel[hidden] {
        display: none;
    }

    .project-panel:not([hidden]) {
        transform: translateX(0);
    }

    .message {
        max-width: 95%;
    }

    .welcome-hints {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .chat-header-actions {
        display: none;
    }

    .input-row {
        gap: 4px;
    }

    .btn-attach {
        display: none;
    }
}

/* ============================================================
   DRAG & DROP (состояние перетаскивания файла)
   ============================================================ */
.drag-over .messages-container {
    position: relative;
}

.drag-over .messages-container::after {
    content: '📎 Перетащите файлы сюда';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-accent);
    background-color: var(--color-surface-overlay);
    border: 2px dashed var(--color-accent);
    border-radius: var(--radius-lg);
    z-index: 50;
}

/* ============================================================
   УТИЛИТАРНЫЕ КЛАССЫ
   ============================================================ */
[hidden] {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}