/* Design System & Custom Properties */
:root {
    --bg-app: #090d16;
    --bg-chat: #0d1321;
    --bg-sidebar: rgba(13, 19, 33, 0.75);
    --border-color: rgba(255, 255, 255, 0.07);
    --border-hover: rgba(99, 102, 241, 0.4);
    
    --color-text-primary: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-primary-light: rgba(99, 102, 241, 0.15);
    
    --color-secondary: #06b6d4;
    --color-secondary-hover: #0891b2;
    
    --color-danger: #ef4444;
    
    --glass-bg: rgba(30, 41, 59, 0.45);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    --font-sans: 'Outfit', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --sidebar-width: 280px;
    --header-height: 70px;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-app);
    color: var(--color-text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    -webkit-font-smoothing: antialiased;
}

/* App Layout */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    position: relative;
}

/* Sidebar Styles */
.sidebar {
    width: var(--sidebar-width);
    height: 100%;
    background-color: #0b0f19;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
}

.sidebar-header {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
}

.brand {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 2px 0;
    width: 100%;
}

.brand-logo-img {
    max-width: 180px;
    height: auto;
    max-height: 42px;
    object-fit: contain;
    display: block;
}

.new-chat-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    background: linear-gradient(135deg, var(--color-primary), #4f46e5);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

.new-chat-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
    background: linear-gradient(135deg, #7073f4, #5a52e8);
}

.new-chat-btn:active {
    transform: translateY(1px);
}

/* Sessions List */
.sessions-container {
    flex: 1;
    overflow-y: auto;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    padding-left: 8px;
    margin-bottom: 6px;
    font-weight: 600;
}

.sessions-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.session-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    group: relative;
}

.session-item:hover {
    background-color: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.05);
}

.session-item.active {
    background-color: var(--color-primary-light);
    border-color: rgba(99, 102, 241, 0.25);
}

.session-content {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex: 1;
}

.session-icon {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.session-item.active .session-icon {
    color: var(--color-primary);
}

.session-title-text {
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--color-text-secondary);
}

.session-item.active .session-title-text {
    color: var(--color-text-primary);
}

.delete-session-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    opacity: 0;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.session-item:hover .delete-session-btn {
    opacity: 1;
}

.delete-session-btn:hover {
    color: var(--color-danger);
    background-color: rgba(239, 68, 68, 0.1);
}

/* Sidebar Footer & Settings */
.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.settings-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px;
}

.settings-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.settings-row label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.settings-select {
    width: 100%;
    background-color: #121824;
    border: 1px solid var(--border-color);
    color: var(--color-text-primary);
    padding: 8px 10px;
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s ease;
}

.settings-select:focus {
    border-color: var(--color-primary);
}

.system-prompt-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    cursor: pointer;
    user-select: none;
    padding-top: 4px;
}

.system-prompt-toggle .chevron {
    transition: transform 0.2s ease;
}

.system-prompt-toggle:hover {
    color: var(--color-primary);
}

.system-prompt-container {
    transition: max-height 0.3s ease-in-out, opacity 0.3s ease;
    max-height: 200px;
    opacity: 1;
    overflow: hidden;
}

.system-prompt-container.collapsed {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

.settings-textarea {
    width: 100%;
    min-height: 70px;
    background-color: #121824;
    border: 1px solid var(--border-color);
    color: var(--color-text-primary);
    padding: 8px 10px;
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    resize: vertical;
    outline: none;
    margin-top: 6px;
    transition: border-color 0.2s ease;
}

.settings-textarea:focus {
    border-color: var(--color-primary);
}

/* Connection Status */
.connection-status {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 6px;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-indicator.online {
    background-color: #10b981;
    box-shadow: 0 0 8px #10b981;
}

.status-indicator.offline {
    background-color: var(--color-danger);
    box-shadow: 0 0 8px var(--color-danger);
}

.status-details {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.status-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.status-url {
    font-size: 0.65rem;
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Main Chat Area */
.chat-area {
    flex: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-chat);
    position: relative;
}

/* Chat Header */
.chat-header {
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    background-color: rgba(13, 19, 33, 0.6);
    backdrop-filter: blur(10px);
    z-index: 90;
}

.menu-btn {
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    display: none;
    transition: background-color 0.2s ease;
}

.menu-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.active-chat-info {
    display: flex;
    flex-direction: column;
}

.active-chat-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.active-chat-meta {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.clear-chat-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.clear-chat-btn:hover {
    color: var(--color-text-primary);
    background-color: rgba(255, 255, 255, 0.03);
    border-color: var(--border-color);
}

/* Messages Viewport */
.messages-viewport {
    flex: 1;
    overflow-y: auto;
    padding: 24px 0;
    display: flex;
    flex-direction: column;
}

/* Welcome View */
.welcome-container {
    max-width: 720px;
    margin: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.welcome-logo {
    width: 60px;
    height: 60px;
    color: var(--color-primary);
    background: var(--color-primary-light);
    border-radius: 16px;
    padding: 14px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.2);
}

.welcome-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.02em;
}

.welcome-subtitle {
    color: var(--color-text-secondary);
    font-size: 1.05rem;
    margin-bottom: 40px;
    max-width: 480px;
    line-height: 1.5;
}

.suggestions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    width: 100%;
}

.suggestion-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 16px;
    text-align: left;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.suggestion-card:hover {
    background: rgba(30, 41, 59, 0.65);
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.suggestion-icon {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.suggestion-text-container {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.suggestion-heading {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.suggestion-description {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* Chat Messages */
.messages-container {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.message-wrapper {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 100%;
    animation: fadeInUp 0.3s ease forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    padding: 0 4px;
}

.message-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 700;
    color: white;
}

.user-message .message-avatar {
    background: linear-gradient(135deg, #818cf8, #4f46e5);
}

.assistant-message .message-avatar {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    color: #0f172a;
}

.message-bubble {
    padding: 14px 18px;
    border-radius: 14px;
    line-height: 1.6;
    font-size: 0.95rem;
    max-width: 85%;
    word-break: break-word;
}

.user-message {
    align-items: flex-end;
}

.user-message .message-bubble {
    background: linear-gradient(135deg, #4f46e5, #3730a3);
    color: white;
    border-bottom-right-radius: 2px;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.2);
}

.assistant-message {
    align-items: flex-start;
}

.assistant-message .message-bubble {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--color-text-primary);
    border-bottom-left-radius: 2px;
    box-shadow: var(--glass-shadow);
}

/* Markdown Rendering in Chat Bubbles */
.message-bubble p {
    margin-bottom: 12px;
}

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

.message-bubble ul, .message-bubble ol {
    margin-left: 20px;
    margin-bottom: 12px;
}

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

.message-bubble code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background-color: rgba(0, 0, 0, 0.35);
    padding: 2px 6px;
    border-radius: 4px;
    color: #f43f5e;
}

.message-bubble pre code {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    color: inherit;
}

.message-bubble pre {
    margin: 14px 0;
    padding: 14px;
    background-color: #0b0f19 !important;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    overflow-x: auto;
    position: relative;
}

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    padding: 4px 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s ease;
    font-family: var(--font-sans);
}

.copy-code-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--color-text-primary);
}

.copy-code-btn.copied {
    color: #10b981;
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
}

.message-bubble table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 0.85rem;
}

.message-bubble th, .message-bubble td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
}

.message-bubble th {
    background-color: rgba(255, 255, 255, 0.04);
    font-weight: 600;
}

.message-bubble a {
    color: var(--color-secondary);
    text-decoration: none;
}

.message-bubble a:hover {
    text-decoration: underline;
}

/* Typing / Thinking Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 8px 4px;
}

.typing-dot {
    width: 7px;
    height: 7px;
    background-color: var(--color-text-secondary);
    border-radius: 50%;
    animation: typingPulse 1.4s infinite ease-in-out both;
}

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

@keyframes typingPulse {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* Chat Input Panel */
.chat-input-panel {
    padding: 16px 24px 24px;
    background: linear-gradient(180deg, transparent, var(--bg-chat) 30%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.input-container {
    max-width: 800px;
    width: 100%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 8px 12px;
    display: flex;
    align-items: flex-end;
    gap: 10px;
    box-shadow: var(--glass-shadow);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.input-container:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px rgba(99, 102, 241, 0.25), 0 8px 32px 0 rgba(99, 102, 241, 0.1);
}

.input-container textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    line-height: 1.5;
    padding: 10px 4px;
    max-height: 200px;
    resize: none;
    outline: none;
}

.input-container textarea::placeholder {
    color: var(--color-text-muted);
}

.input-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    padding-bottom: 4px;
}

.send-btn, .stop-btn {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.send-btn {
    background-color: var(--color-primary);
    color: white;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
    transform: scale(1.05);
}

.send-btn:disabled {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--color-text-muted);
    cursor: not-allowed;
}

.stop-btn {
    background-color: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.25);
    color: var(--color-danger);
}

.stop-btn:hover {
    background-color: var(--color-danger);
    color: white;
}

.stop-icon {
    width: 12px;
    height: 12px;
    background-color: currentColor;
    border-radius: 2px;
}

.hidden {
    display: none !important;
}

.input-subtext {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(99, 102, 241, 0.3);
}

/* Responsive styles */
@media (max-width: 768px) {
    .menu-btn {
        display: block;
    }
    
    .sidebar {
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
    }
    
    .sidebar.visible {
        transform: translateX(0);
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.5);
    }
    
    .suggestions-grid {
        grid-template-columns: 1fr;
    }
    
    .chat-header {
        padding: 0 16px;
    }
    
    .messages-container {
        padding: 0 12px;
    }
}