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

:root {
    --primary: #0084ff;
    --primary-hover: #3399ff;
    --secondary: #66b3ff;
    --accent: #0084ff;
    --success: #0084ff;
    --warning: #3399ff;
    --error: #0084ff;
    --info: #66b3ff;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f0f2f5;
    --bg-hover: #e8eaed;
    --text-primary: #1a1a1a;
    --text-secondary: #555555;
    --text-tertiary: #888888;
    --border: #e0e0e0;
    --border-dark: #d0d0d0;
    --border-focus: #0084ff;
    --glass: rgba(255, 255, 255, 0.95);
    --shadow: rgba(0, 132, 255, 0.08);
    --message-user: #0084ff;
    --message-ai: #f5f5f5;
    --message-ai-text: #1a1a1a;
    --input-bg: #ffffff;
    --sidebar-bg: #f8f9fa;
    --code-bg: #f0f2f5;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #050505;
    --bg-tertiary: #151515;
    --bg-hover: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --border: #2a2a2a;
    --border-dark: #333333;
    --border-focus: #0084ff;
    --glass: rgba(10, 10, 10, 0.95);
    --shadow: rgba(0, 132, 255, 0.2);
    --message-user: #0084ff;
    --message-ai: #151515;
    --message-ai-text: #ffffff;
    --input-bg: #151515;
    --sidebar-bg: #050505;
    --code-bg: #1a1a1a;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, background 0.3s ease;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.new-chat-btn {
    width: 100%;
    padding: 0.875rem;
    background: var(--primary);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.new-chat-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--shadow);
}

.new-chat-btn::before {
    content: '+';
    font-size: 1.3rem;
    font-weight: 300;
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.chat-history-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 0.75rem;
    padding: 0 0.5rem;
}

.chat-item {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text-secondary);
    border: 1px solid transparent;
}

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

.chat-item.active {
    background: var(--bg-hover);
    color: var(--primary);
    font-weight: 500;
    border-color: var(--primary);
}

.chat-item-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.9rem;
}

.chat-item-date {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.delete-chat {
    opacity: 0;
    padding: 0.25rem;
    color: var(--text-tertiary);
    transition: all 0.2s ease;
    cursor: pointer;
    border-radius: 4px;
}

.chat-item:hover .delete-chat {
    opacity: 1;
}

.delete-chat:hover {
    color: var(--primary);
    background: var(--bg-hover);
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid var(--border);
}

.theme-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
}

.theme-toggle-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.theme-switch {
    position: relative;
    width: 48px;
    height: 24px;
    background: var(--border);
    border-radius: 12px;
    transition: background 0.3s ease;
    border: 1px solid var(--border-dark);
}

.theme-switch::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    transition: transform 0.3s ease;
}

[data-theme="dark"] .theme-switch {
    background: var(--primary);
}

[data-theme="dark"] .theme-switch::after {
    transform: translateX(24px);
    background: #ffffff;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.chat-header {
    background: var(--glass);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s ease;
}

.toggle-sidebar {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 6px;
    transition: all 0.2s ease;
}

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

.chat-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.chat-logo::before {
    content: '◉';
    font-size: 1.2rem;
    color: var(--primary);
}

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

.limit-display {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.limit-display strong {
    color: var(--primary);
    font-weight: 600;
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    background: var(--bg-secondary);
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}

.messages-container::-webkit-scrollbar {
    width: 8px;
}

.messages-container::-webkit-scrollbar-track {
    background: transparent;
}

.messages-container::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}

.messages-container::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}

.message {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 0.3s ease;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.1rem;
    border: 2px solid var(--border);
}

.message.ai .message-avatar {
    background: var(--bg-primary);
    border-color: var(--primary);
    color: var(--primary);
}

.message.user .message-avatar {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

.message-content {
    max-width: 70%;
    padding: 1rem 1.25rem;
    border-radius: 16px;
    line-height: 1.6;
    font-size: 0.95rem;
    border: 1px solid var(--border);
}

.message.ai .message-content {
    background: var(--message-ai);
    color: var(--message-ai-text);
    border-top-left-radius: 4px;
}

.message.user .message-content {
    background: var(--message-user);
    color: #ffffff;
    border-top-right-radius: 4px;
    border-color: var(--message-user);
}

.message-content pre {
    background: var(--code-bg);
    padding: 0.75rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 0.5rem 0;
    font-family: 'Courier New', monospace;
    border: 1px solid var(--border);
}

.message-content code {
    background: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    border: 1px solid var(--border);
}

/* Markdown styling */
.message-content h1,
.message-content h2,
.message-content h3 {
    color: inherit;
    font-weight: 600;
}

.message-content h1 {
    font-size: 1.8rem;
    margin: 1rem 0 0.5rem 0;
}

.message-content h2 {
    font-size: 1.4rem;
    margin: 0.8rem 0 0.4rem 0;
}

.message-content h3 {
    font-size: 1.2rem;
    margin: 0.6rem 0 0.3rem 0;
}

.message-content ul,
.message-content ol {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.message-content li {
    margin: 0.25rem 0;
    line-height: 1.6;
}

.message-content blockquote {
    border-left: 3px solid var(--primary);
    padding-left: 1rem;
    margin: 0.5rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

.message-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1rem 0;
}

.message-content a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: opacity 0.2s;
}

.message-content a:hover {
    opacity: 0.7;
}

.message-content img {
    border: 2px solid var(--border);
}

.welcome-message {
    text-align: center;
    padding: 4rem 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.welcome-message h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    letter-spacing: -1px;
}

.welcome-message p {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.suggestion-chip {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    padding: 1rem 1.25rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.suggestion-chip:hover {
    border-color: var(--primary);
    background: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.suggestion-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.suggestion-desc {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--text-tertiary);
}

.input-container {
    padding: 1.5rem 2rem;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
}

.input-wrapper {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

.input-field {
    flex: 1;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.875rem 1.25rem;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    resize: none;
    outline: none;
    transition: all 0.2s ease;
    max-height: 240px;
    overflow-y: auto;
    line-height: 1.5;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}

.input-field::-webkit-scrollbar {
    width: 6px;
}

.input-field::-webkit-scrollbar-track {
    background: transparent;
}

.input-field::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

.input-field:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 132, 255, 0.1);
}

.input-field::placeholder {
    color: var(--text-tertiary);
}

.send-button {
    background: var(--primary);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.send-button:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: scale(1.05);
    box-shadow: 0 4px 12px var(--shadow);
}

.send-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.send-button svg {
    width: 20px;
    height: 20px;
}

.typing-indicator {
    display: flex;
    gap: 0.3rem;
    padding: 1rem;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: translateY(0);
    }
    30% {
        opacity: 1;
        transform: translateY(-10px);
    }
}

/* Mobile Overlay */
.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 1000;
        transform: translateX(-100%);
    }

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

    .mobile-overlay.show {
        display: block;
    }

    .toggle-sidebar {
        display: block;
    }

    .message-content {
        max-width: 85%;
    }

    .suggestions {
        grid-template-columns: 1fr;
    }

    .welcome-message h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 85%;
    }

    .messages-container {
        padding: 1rem;
    }

    .input-container {
        padding: 1rem;
    }

    .message-content {
        max-width: 90%;
        padding: 0.875rem 1rem;
    }
}  
/* Mobile Header Fixes */
@media (max-width: 768px) {
    .chat-header {
        padding: 0.75rem 1rem;
    }

    .toggle-sidebar {
        display: block;
        font-size: 1.3rem;
        padding: 0.4rem;
        margin-right: 0.5rem;
    }

    .chat-logo {
        font-size: 1rem;
        letter-spacing: -0.3px;
    }

    .chat-logo::before {
        display: none; /* Убираем иконку */
    }

    .limit-display {
        font-size: 0.7rem;
        text-align: right;
        line-height: 1.2;
        max-width: 80px;
    }

    .limit-display br {
        display: block;
    }
}

@media (max-width: 480px) {
    .chat-header {
        padding: 0.6rem 0.75rem;
    }

    .toggle-sidebar {
        font-size: 1.2rem;
        padding: 0.3rem;
        margin-right: 0.4rem;
    }

    .chat-logo {
        font-size: 0.9rem;
    }

    .limit-display {
        font-size: 0.65rem;
        max-width: 70px;
    }
}  

/* Общий вид блоков кода в сообщениях */
.message-content pre[class*="language-"],
.message-content pre code[class*="language-"] {
  background: var(--code-bg) !important;
  border: 1px solid var(--border);
  border-radius: 8px;
}

/* Отступы и скролл */
.message-content pre {
  padding: 1rem !important;
  margin: 0.75rem 0;
  overflow: auto;
}

/* Моноширинный */
.message-content code,
.message-content pre code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Courier New", monospace;
  font-size: 0.9em;
}

/* Номера строк Prism */
.message-content pre.line-numbers {
  padding-left: 3.5em; /* место для номеров */
  position: relative;
}

/* Подстройка темы Prism под тёмную схему */
[data-theme="dark"] .token.comment,
[data-theme="dark"] .token.prolog,
[data-theme="dark"] .token.doctype,
[data-theme="dark"] .token.cdata { color: #7f8c8d; }