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

/* IDE Color Scheme - Dark Theme (Default) */
:root {
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #2d2d30;
    --border-color: #3e3e42;
    --text-primary: #cccccc;
    --text-secondary: #858585;
    --accent-blue: #007acc;
    --accent-hover: #094771;
    --success-green: #4ec9b0;
    --warning-yellow: #dcdcaa;
    --tab-active: #1e1e1e;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f3f3f3;
    --bg-tertiary: #e8e8e8;
    --border-color: #d4d4d4;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent-blue: #0066cc;
    --accent-hover: #e6f2ff;
    --success-green: #047857;
    --warning-yellow: #92400e;
    --tab-active: #ffffff;
}

body {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

/* Main IDE Container */
.ide-container {
    display: grid;
    grid-template-columns: 250px 1fr 320px;
    height: 100vh;
    width: 100vw;
}

/* Left Sidebar */
.sidebar {
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

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

.sidebar-header h1 {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--text-primary);
}

.header-buttons {
    display: flex;
    gap: 8px;
}

.theme-toggle,
.mobile-menu-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 20px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.theme-toggle:hover,
.mobile-menu-toggle:hover {
    background-color: var(--bg-secondary);
}

.mobile-menu-toggle {
    display: none;
}

.theme-icon,
.hamburger-icon {
    display: inline-block;
    transition: transform 0.3s;
}

.theme-toggle:hover .theme-icon {
    transform: rotate(20deg);
}

.project-nav {
    padding: 12px 0;
}

.nav-section {
    margin-bottom: 20px;
}

.nav-section h3 {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 8px 16px;
    letter-spacing: 0.5px;
}

.nav-section ul {
    list-style: none;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 6px 16px;
    cursor: pointer;
    transition: background-color 0.2s;
    font-size: 13px;
    gap: 8px;
}

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

.nav-item.active {
    background-color: var(--accent-hover);
    color: var(--text-primary);
}

.nav-item .icon {
    font-size: 16px;
    width: 20px;
}

/* Main Content Area */
.content-area {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    height: 100vh;
    overflow: hidden;
}

.tab-bar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    height: 36px;
    overflow-x: auto;
}

.tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--bg-tertiary);
    border-right: 1px solid var(--border-color);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: background-color 0.2s;
}

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

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

.tab-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 18px;
    padding: 0;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 3px;
}

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

.editor-area {
    flex: 1;
    overflow-y: auto;
    position: relative;
}

.page-content {
    display: none;
    padding: 24px 32px;
    padding-bottom: 80px;
    max-width: 900px;
    line-height: 1.6;
    min-height: 100%;
}

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

.page-content h1 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--success-green);
    font-weight: 600;
}

.page-content h2 {
    font-size: 22px;
    margin-top: 24px;
    margin-bottom: 12px;
    color: var(--warning-yellow);
    font-weight: 500;
}

.page-content h3 {
    font-size: 18px;
    margin-top: 20px;
    margin-bottom: 10px;
    color: var(--accent-blue);
}

.page-content p {
    margin-bottom: 16px;
    font-size: 14px;
    color: var(--text-primary);
}

.page-content ul, .page-content ol {
    margin-left: 24px;
    margin-bottom: 16px;
}

.page-content li {
    margin-bottom: 8px;
    font-size: 14px;
}

.page-content a {
    color: var(--accent-blue);
    text-decoration: none;
}

.page-content a:hover {
    text-decoration: underline;
}

.page-content code {
    background-color: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    color: var(--success-green);
}

.page-content pre {
    background-color: var(--bg-tertiary);
    padding: 16px;
    border-radius: 4px;
    overflow-x: auto;
    margin-bottom: 16px;
    border-left: 3px solid var(--accent-blue);
}

.page-content pre code {
    background: none;
    padding: 0;
}

/* Right Chat Panel */
.chat-panel {
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

.chat-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-tertiary);
}

.chat-header h2 {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.chat-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 16px;
    padding: 4px 8px;
}

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

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-message {
    font-size: 13px;
    line-height: 1.5;
}

.chat-message.system {
    color: var(--text-secondary);
    font-style: italic;
}

.chat-message.user {
    background-color: var(--bg-tertiary);
    padding: 8px 12px;
    border-radius: 4px;
    border-left: 3px solid var(--accent-blue);
}

.chat-message.assistant {
    background-color: var(--bg-primary);
    padding: 8px 12px;
    border-radius: 4px;
    border-left: 3px solid var(--success-green);
}

.chat-timestamp {
    font-size: 11px;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 4px;
}

.token-usage {
    display: block;
    font-size: 10px;
    color: var(--text-secondary);
    margin-top: 6px;
    opacity: 0.7;
    font-style: italic;
}

.chat-input-container {
    padding: 12px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
}

.chat-input {
    width: 100%;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    resize: vertical;
    min-height: 60px;
    border-radius: 3px;
}

.chat-input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.chat-send {
    margin-top: 8px;
    width: 100%;
    background-color: var(--accent-blue);
    color: white;
    border: none;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 13px;
    border-radius: 3px;
    font-weight: 500;
    transition: background-color 0.2s;
}

.chat-send:hover {
    background-color: var(--accent-hover);
}

.chat-send:active {
    transform: scale(0.98);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

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

/* Responsive Design */
@media (max-width: 1200px) {
    .ide-container {
        grid-template-columns: 220px 1fr 300px;
    }
}

@media (max-width: 968px) {
    .ide-container {
        grid-template-columns: 180px 1fr;
    }
    
    .chat-panel {
        display: none;
    }
}

@media (max-width: 768px) {
    body {
        overflow-y: auto;
    }
    
    .ide-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
        height: auto;
        min-height: 100vh;
    }
    
    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        height: auto;
        max-height: none;
    }
    
    .sidebar-header h1 {
        font-size: 16px;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .project-nav {
        display: none;
    }
    
    .sidebar.menu-open .project-nav {
        display: block;
    }
    
    .nav-section {
        margin-bottom: 12px;
    }
    
    .nav-section h3 {
        padding: 6px 12px;
    }
    
    .nav-item {
        padding: 8px 12px;
        font-size: 14px;
    }
    
    .content-area {
        height: auto;
        min-height: calc(100vh - 200px);
    }
    
    .tab-bar {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab {
        white-space: nowrap;
    }
    
    .editor-area {
        height: auto;
        overflow-y: visible;
    }
    
    .page-content {
        padding: 16px 20px;
        padding-bottom: 40px;
        max-width: 100%;
    }
    
    .page-content h1 {
        font-size: 24px;
    }
    
    .page-content h2 {
        font-size: 20px;
    }
    
    .page-content h3 {
        font-size: 16px;
    }
    
    .chat-panel {
        display: none;
    }
}