:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary-color: #7c3aed;
    --accent-color: #06b6d4;
    --dark-bg: #0f172a;
    --darker-bg: #020617;
    --light-bg: #ffffff;
    --light-secondary: #f8fafc;
    --dark-text: #1e293b;
    --light-text: #f1f5f9;
    --gray-text: #94a3b8;
    --border-light: #e2e8f0;
    --border-dark: #334155;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
}

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

body {
    font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--light-bg);
    color: var(--dark-text);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
    display: flex;
    flex-direction: column;
    height: 100vh;
    font-weight: 400;
}

body.dark-mode {
    background-color: var(--dark-bg);
    color: var(--light-text);
}

.app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    background: linear-gradient(180deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
    color: var(--light-text);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    z-index: 100;
    transform: translateX(-100%);
    position: fixed;
    height: 100%;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
}

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

.light-mode .sidebar {
    background: linear-gradient(180deg, var(--light-bg) 0%, var(--light-secondary) 100%);
    color: var(--dark-text);
    border-right: 1px solid var(--border-light);
}

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

.light-mode .sidebar-header {
    border-bottom: 1px solid var(--border-light);
}

.app-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 16px;
    color: var(--light-text);
}

.light-mode .app-brand {
    color: var(--dark-text);
}

.brand-icon {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 14px;
}

.new-chat-btn {
    width: 100%;
    padding: 10px 14px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    font-weight: 500;
    font-size: 14px;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.new-chat-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
}

.conversation-item {
    padding: 10px 14px;
    border-radius: 8px;
    margin-bottom: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s;
    position: relative;
    border: 1px solid transparent;
    font-size: 14px;
}

.conversation-item:hover {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: var(--border-dark);
}

.light-mode .conversation-item:hover {
    background-color: rgba(0, 0, 0, 0.04);
    border-color: var(--border-light);
}

.conversation-item.active {
    background-color: rgba(37, 99, 235, 0.15);
    border-color: var(--primary-color);
}

.light-mode .conversation-item.active {
    background-color: rgba(37, 99, 235, 0.08);
}

.conversation-title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 13px;
    font-weight: 500;
    color: var(--light-text);
}

.light-mode .conversation-title {
    color: var(--dark-text);
}

.conversation-actions {
    opacity: 0;
    transition: opacity 0.2s;
    display: flex;
    gap: 6px;
}

.conversation-item:hover .conversation-actions {
    opacity: 1;
}

.conversation-action-btn {
    background: none;
    border: none;
    color: var(--gray-text);
    cursor: pointer;
    font-size: 12px;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.conversation-action-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--light-text);
}

.light-mode .conversation-action-btn:hover {
    background-color: rgba(0, 0, 0, 0.1);
    color: var(--dark-text);
}

.sidebar-footer {
    padding: 14px;
    border-top: 1px solid var(--border-dark);
}

.light-mode .sidebar-footer {
    border-top: 1px solid var(--border-light);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    border-radius: 8px;
    transition: background-color 0.2s;
    cursor: pointer;
}

.user-info:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

.light-mode .user-info:hover {
    background-color: rgba(0, 0, 0, 0.04);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 14px;
    font-weight: 600;
}

.user-name {
    flex: 1;
    font-size: 13px;
    font-weight: 500;
    color: var(--light-text);
}

.light-mode .user-name {
    color: var(--dark-text);
}

/* Main Content Styles */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--light-bg);
    width: 100%;
    transition: margin-left 0.3s ease;
}

.dark-mode .main-content {
    background-color: var(--dark-bg);
}

.chat-header {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--light-bg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    height: 60px;
}

.dark-mode .chat-header {
    background-color: var(--dark-bg);
    border-bottom: 1px solid var(--border-dark);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.chat-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-text);
}

.dark-mode .chat-title {
    color: var(--light-text);
}

.header-actions {
    display: flex;
    gap: 10px;
}

.header-btn {
    background: none;
    border: none;
    color: var(--gray-text);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 6px;
}

.header-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--dark-text);
}

.dark-mode .header-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--light-text);
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    background-color: var(--light-bg);
}

.dark-mode .chat-container {
    background-color: var(--dark-bg);
}

.message {
    display: flex;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-light);
    animation: fadeIn 0.3s ease;
}

.dark-mode .message {
    border-bottom: 1px solid var(--border-dark);
}

.message:last-child {
    border-bottom: none;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 14px;
    font-size: 13px;
    font-weight: 600;
    flex-shrink: 0;
}

.user-avatar-message {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.ai-avatar-message {
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
    color: white;
}

.message-content {
    flex: 1;
}

.message-text {
    line-height: 1.6;
    word-wrap: break-word;
    color: var(--dark-text);
}

.dark-mode .message-text {
    color: var(--light-text);
}

.message-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    opacity: 0;
    transition: opacity 0.2s;
}

.message:hover .message-actions {
    opacity: 1;
}

.action-btn {
    background: none;
    border: none;
    color: var(--gray-text);
    cursor: pointer;
    font-size: 13px;
    padding: 5px 10px;
    border-radius: 5px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: 500;
}

.action-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--dark-text);
}

.dark-mode .action-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--light-text);
}

/* Input Area Styles */
.input-container {
    padding: 12px 16px;
    border-top: 1px solid var(--border-light);
    background-color: var(--light-bg);
    height: 100px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.dark-mode .input-container {
    background-color: var(--dark-bg);
    border-top: 1px solid var(--border-dark);
}

.input-box {
    max-width: 768px;
    margin: 0 auto;
    position: relative;
    width: 100%;
}

.mode-selector {
    display: flex;
    gap: 6px;
    margin-bottom: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.mode-btn {
    padding: 5px 10px;
    border: 1px solid var(--border-light);
    background: white;
    border-radius: 16px;
    font-size: 11px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
    color: var(--dark-text);
}

.dark-mode .mode-btn {
    background: var(--darker-bg);
    border: 1px solid var(--border-dark);
    color: var(--light-text);
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: transparent;
    color: white;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.2);
}

.input-group {
    position: relative;
}

.message-input {
    width: 100%;
    padding: 8px 42px 8px 12px;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    resize: none;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.4;
    background-color: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: all 0.2s;
    max-height: 80px;
    /* Remove resize handle */
    resize: none;
    /* Ensure proper scrolling */
    overflow-y: auto;
    color: var(--dark-text);
}

.message-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.1);
}

.dark-mode .message-input {
    background-color: var(--darker-bg);
    border: 1px solid var(--border-dark);
    color: var(--light-text);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.dark-mode .message-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.2);
}

/* Hide scrollbar for textarea but keep functionality */
.message-input::-webkit-scrollbar {
    width: 6px;
}

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

.message-input::-webkit-scrollbar-thumb {
    background: var(--gray-text);
    border-radius: 3px;
}

.message-input::-webkit-scrollbar-thumb:hover {
    background: var(--dark-text);
}

.dark-mode .message-input::-webkit-scrollbar-thumb {
    background: var(--border-dark);
}

.dark-mode .message-input::-webkit-scrollbar-thumb:hover {
    background: var(--light-text);
}

.send-button {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.2);
}

.send-button:hover {
    transform: translateY(-50%) scale(1.05);
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.send-button:disabled {
    background: var(--gray-text);
    cursor: not-allowed;
    transform: translateY(-50%);
    box-shadow: none;
}

.input-footer {
    text-align: center;
    margin-top: 6px;
    font-size: 10px;
    color: var(--gray-text);
}

/* Typing Indicator */
.typing-indicator {
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

.typing-dot {
    height: 6px;
    width: 6px;
    border-radius: 50%;
    background-color: var(--gray-text);
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
    0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

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

/* Typewriter effect */
.typewriter {
    overflow: hidden;
    white-space: pre-wrap;
    border-right: 2px solid transparent;
    animation: blink-caret 1s infinite;
}

.typewriter-content {
    display: inline;
}

@keyframes blink-caret {
    0%, 100% { border-color: transparent; }
    50% { border-color: var(--primary-color); }
}

/* Code Block Styles */
.code-block {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    margin: 12px 0;
    background: #1e1e1e;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: #2d2d2d;
    color: #f8f9fa;
    font-size: 12px;
    font-weight: 500;
}

.code-actions {
    display: flex;
    gap: 6px;
}

.code-action-btn {
    background: none;
    border: none;
    color: #f8f9fa;
    cursor: pointer;
    font-size: 12px;
    padding: 4px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.code-action-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.code-content {
    padding: 12px;
    overflow-x: auto;
}

/* Mobile Styles */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100%;
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
        display: none;
    }
    
    .overlay.show {
        display: block;
    }
    
    .message {
        padding: 12px 0;
    }
    
    .chat-container {
        padding: 12px;
    }
    
    .input-container {
        padding: 10px;
        height: 90px;
    }
}

/* Welcome Screen */
.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 30px 20px;
}

.welcome-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.welcome-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    font-size: 16px;
    color: var(--gray-text);
    margin-bottom: 30px;
    max-width: 600px;
    line-height: 1.5;
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    max-width: 800px;
    width: 100%;
}

.capability-card {
    padding: 20px;
    border-radius: 10px;
    background-color: var(--light-secondary);
    text-align: center;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.capability-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
    border-color: var(--border-light);
}

.dark-mode .capability-card {
    background-color: var(--darker-bg);
    border-color: var(--border-dark);
}

.dark-mode .capability-card:hover {
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.capability-icon {
    font-size: 24px;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.capability-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark-text);
}

.dark-mode .capability-title {
    color: var(--light-text);
}

.capability-desc {
    font-size: 13px;
    color: var(--gray-text);
    line-height: 1.4;
}

/* Footer */
.app-footer {
    padding: 14px 20px;
    border-top: 1px solid var(--border-light);
    text-align: center;
    font-size: 12px;
    color: var(--gray-text);
    background-color: var(--light-bg);
    height: 50px;
}

.dark-mode .app-footer {
    background-color: var(--dark-bg);
    border-top: 1px solid var(--border-dark);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-left, .footer-right {
    flex: 1;
}

.footer-right {
    text-align: right;
}

.footer-love {
    color: var(--error-color);
}

/* Login Modal */
.modal-content {
    border-radius: 12px;
    overflow: hidden;
    border: none;
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.1);
}

.dark-mode .modal-content {
    background-color: var(--dark-bg);
    color: var(--light-text);
}

.modal-header {
    border-bottom: none;
    padding: 20px 20px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.modal-body {
    padding: 12px 20px;
}

.modal-footer {
    border-top: none;
    padding: 0 20px 20px;
}

.form-control {
    border-radius: 8px;
    padding: 10px 14px;
    border: 1px solid var(--border-light);
    transition: all 0.2s;
    background-color: white;
    color: var(--dark-text);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(37, 99, 235, 0.15);
}

.dark-mode .form-control {
    background-color: var(--darker-bg);
    border: 1px solid var(--border-dark);
    color: var(--light-text);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 500;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-outline-danger {
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 500;
}

/* Toast Styles */
.toast {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 9999;
}

/* Responsive adjustments for chat area */
@media (min-width: 769px) {
    .main-content.sidebar-open {
        margin-left: 280px;
        transition: margin-left 0.3s ease;
    }
}