/* Base Variables - Premium Light Theme */
:root {
    --bg-main: #FFFFFF;
    --bg-sidebar: #F7F7F8;
    --bg-input: #F3F4F6;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --accent: #5E6AD2;
    --accent-hover: #727DF5;
    --border: rgba(0, 0, 0, 0.1);
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.05);
    
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-main);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    line-height: 1.6;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar Styling */
.sidebar {
    width: 280px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    border-radius: 8px;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, color 0.2s;
}

.icon-btn:hover {
    background: var(--bg-input);
    color: var(--accent);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 10px 15px;
}

.chat-history-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: background 0.2s, color 0.2s;
    font-size: 0.95rem;
}

.chat-history-item:hover, .chat-history-item.active {
    background: var(--bg-input);
    color: var(--text-primary);
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    cursor: pointer;
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

/* Main Content Styling */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: all 0.3s ease;
    border-right: 1px solid var(--border);
}

.app-container.chat-collapsed .main-content {
    flex: 0 0 0;
    width: 0;
    overflow: hidden;
    opacity: 0;
    border-right: none;
}

.app-container.chat-collapsed .preview-pane {
    width: auto !important;
}

.floating-uncollapse-btn {
    display: none;
    position: absolute;
    top: 14px;
    left: 16px;
    z-index: 10000;
    background: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    padding: 8px 14px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(0,0,0,0.35);
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.floating-uncollapse-btn:hover {
    filter: brightness(1.15);
    transform: translateY(-1px);
}

.app-container.chat-collapsed #floating-uncollapse-btn {
    display: inline-flex !important;
}

#preview-content iframe, #preview-content textarea {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    resize: none;
    background: transparent;
    padding: 15px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 14px;
    color: var(--text-primary);
}

#preview-content iframe {
    padding: 0;
    background: white;
}

.top-nav {
    padding: 15px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.85);
    position: sticky;
    top: 0;
    z-index: 10;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.mobile-only {
    display: none;
}

/* Chat Area */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 40px 20px 220px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.messages-wrapper {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Welcome Screen */
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    gap: 20px;
    color: var(--text-secondary);
}

.welcome-icon {
    font-size: 3rem;
    color: var(--accent);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

/* Messages */
.message {
    display: flex;
    gap: 16px;
    opacity: 0;
    transform: translateY(10px);
    animation: fadeIn 0.4s forwards ease-out;
}

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

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

.msg-avatar {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message.ai .msg-avatar {
    background: var(--accent);
    color: white;
}

.message.user .msg-avatar {
    background: #E5E7EB;
    color: var(--text-primary);
}

.msg-content {
    background: var(--bg-input);
    padding: 16px 20px;
    border-radius: 12px;
    max-width: 85%;
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    font-size: 1rem;
    border: 1px solid var(--border);
}

.message.user .msg-content {
    background: #FFFFFF;
    border-bottom-right-radius: 4px;
}

.message.ai .msg-content {
    border-bottom-left-radius: 4px;
    background: var(--bg-input);
}

/* Loading Dot Animation */
.typing-indicator {
    display: flex;
    gap: 6px;
    padding: 8px 0;
}

.dot {
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out both;
}

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

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

/* Input Area */
.input-area {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    background: linear-gradient(transparent, var(--bg-main) 30%);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.input-container {
    width: 100%;
    max-width: 800px;
    position: relative;
    background: var(--bg-main);
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-soft);
    display: flex;
    align-items: flex-end;
    padding: 12px 16px;
    transition: border-color 0.3s;
}

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

#message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    resize: none;
    max-height: 200px;
    padding: 4px 10px 4px 0;
    outline: none;
    line-height: 1.5;
}

#message-input::placeholder {
    color: #9CA3AF;
}

.send-btn {
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 10px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background 0.2s, transform 0.1s;
    margin-bottom: 2px;
}

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

.send-btn:active {
    transform: scale(0.95);
}

.send-btn:disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
    opacity: 0.5;
}

.input-footer {
    margin-top: 10px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        z-index: 100;
        height: 100%;
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .mobile-only {
        display: block;
    }
    
    .msg-content {
        max-width: 90%;
    }
}

/* Markdown Styles within msg-content */
.msg-content h1, .msg-content h2, .msg-content h3, .msg-content h4 {
    margin-top: 1.2em;
    margin-bottom: 0.6em;
    font-weight: 600;
}
.msg-content p {
    margin-bottom: 0.8em;
}
.msg-content p:last-child {
    margin-bottom: 0;
}
.msg-content ul, .msg-content ol {
    margin-bottom: 0.8em;
    padding-left: 24px;
}
.msg-content li {
    margin-bottom: 0.2em;
}
.msg-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 1.2em 0;
    font-size: 0.9em;
}
.msg-content th, .msg-content td {
    border: 1px solid var(--border);
    padding: 10px 12px;
    text-align: left;
}
.msg-content th {
    background: rgba(0,0,0,0.03);
    font-weight: 600;
}
.msg-content pre {
    background: #1e1e1e !important; /* For hljs */
    color: #d4d4d4;
    padding: 14px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1em 0;
    font-size: 0.9em;
}
.msg-content code {
    font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    background: rgba(0,0,0,0.06);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
}
.msg-content pre code {
    background: transparent;
    padding: 0;
    font-size: 1em;
}
.msg-content blockquote {
    border-left: 4px solid var(--accent);
    margin: 1em 0;
    padding-left: 12px;
    color: var(--text-secondary);
    font-style: italic;
}
.msg-content hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 1.5em 0;
}


/* Workspace Styles */
.workspace-section {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.workspace-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    padding: 0 10px;
}

.workspace-header h3 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 0;
}

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

.workspace-actions button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.workspace-actions button:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.file-tree {
    flex-grow: 1;
    overflow-y: auto;
    padding: 0 5px;
}

.tree-item {
    display: flex;
    align-items: center;
    padding: 6px 8px;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all 0.2s;
    user-select: none;
    position: relative;
    gap: 0;
}

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

.tree-item i {
    margin-right: 8px;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.tree-item .ph-folder {
    color: var(--accent);
}

.tree-item .ph-file {
    color: var(--text-secondary);
}

.tree-item-name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding-right: 4px;
}

.tree-item-actions {
    display: none;
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-sidebar);
    padding: 2px 4px;
    border-radius: 4px;
    z-index: 5;
    gap: 2px;
    align-items: center;
    box-shadow: -8px 0 6px -2px var(--bg-sidebar);
}

.tree-item:hover .tree-item-actions {
    display: flex;
    gap: 2px;
}

.tree-item-actions button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 2px 3px;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.tree-children {
    padding-left: 15px;
    display: none;
}

.tree-children.expanded {
    display: block;
}

/* Modal styles for prompt dialogs */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border: 1px solid var(--border);
}

.modal-content h3 {
    margin-bottom: 15px;
}

.modal-content input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 15px;
    background: var(--bg-input);
    color: var(--text-primary);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.modal-btn {
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    border: none;
    font-weight: 500;
}

.modal-btn.cancel {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.modal-btn.confirm {
    background: var(--accent);
    color: white;
}

/* MENTION DROPDOWN */
.mention-dropdown {
    position: absolute;
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    max-height: 200px;
    overflow-y: auto;
    z-index: 1000;
    min-width: 200px;
    max-width: 300px;
}
.mention-item {
    padding: 8px 12px;
    cursor: pointer;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: #334155;
}
.mention-item:hover {
    background: #f1f5f9;
}
.mention-item i {
    font-size: 16px;
    color: #64748b;
}