body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    /* background-color: #f4f4f4; */ /* Removed for background image */
    display: flex;
    /* justify-content: center; */ /* Removed for left alignment */
    align-items: center;
    min-height: 100vh;
}

#chat-container {
    width: 95%; /* 左右加宽多一点 */
    max-width: 1100px; /* 左右加宽多一点 */
    height: 92vh; /* 上下加高一点点 */
    max-height: 950px; /* 上下加高一点点 */
    /* background-color: #fff; */ /* Removed for background image */
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    margin-left: 20px; /* Align left with same margin as floating window right */
}

#chat-header {
    padding: 15px 20px;
    background-color: #4a90e2;
    color: white;
    border-bottom: 1px solid #ddd;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px; /* Add some space between title and controls */
}

#controls-area {
    display: flex;
    align-items: center;
    gap: 15px; /* Space between select dropdown and AI status */
}

#chat-session-select {
    padding: 5px 8px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 0.9em;
    cursor: pointer;
}

#chat-session-select:focus {
    outline: none;
    border-color: white;
}

/* Style options within the select dropdown */
#chat-session-select option {
    background-color: #4a90e2; /* Match header background */
    color: white;
}

#chat-header h1 {
    margin: 0;
    font-size: 1.2em;
}

#ai-status {
    font-size: 0.9em;
}

#ai-status span {
    display: inline-block;
    margin-left: 10px;
    padding: 3px 8px;
    border-radius: 4px;
    background-color: rgba(255, 255, 255, 0.2);
}


#chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    flex-direction: column;
    background-size: cover; /* Ensure background covers the area */
    background-position: center center; /* Center the background */
    background-repeat: no-repeat; /* Prevent tiling */
}

.message {
    margin-bottom: 15px;
    display: flex; /* Use flexbox for layout */
    align-items: flex-end; /* Align avatar and bubble bottom */
    /* max-width, padding, border-radius, word-wrap, line-height moved to .message-content */
}

/* New class for the avatar image */
.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%; /* Circular avatar */
    margin: 0 10px; /* Space between avatar and message bubble */
    object-fit: cover; /* Ensure image covers the area well */
    flex-shrink: 0; /* Prevent avatar from shrinking */
    align-self: flex-start; /* Align avatar to the top of the flex container */
}

/* New class to wrap the actual message text and sender */
.message-content {
    padding: 10px 15px;
    border-radius: 18px;
    max-width: 75%; /* Max width for the bubble */
    word-wrap: break-word;
    line-height: 1.4;
}

.user-message {
    /* background-color moved to .message-content */
    align-self: flex-end; /* Keep the whole message row to the right */
    flex-direction: row-reverse; /* Avatar on the right */
    /* border-bottom-right-radius moved to .message-content */
}

/* Apply styles specifically to user message content */
.user-message .message-content {
    background-color: rgba(220, 248, 198, 0.7); /* Semi-transparent light green */
    border-bottom-right-radius: 5px;
    backdrop-filter: blur(8px); /* Add blur effect */
    -webkit-backdrop-filter: blur(8px); /* For Safari compatibility */
    border: 1px solid rgba(255, 255, 255, 0.1); /* Optional: subtle border */
}

.ai-message {
    /* background-color moved to .message-content */
    align-self: flex-start; /* Keep the whole message row to the left */
    flex-direction: row; /* Avatar on the left (default, but explicit) */
    /* border-bottom-left-radius moved to .message-content */
}

/* Apply styles specifically to AI message content */
.ai-message .message-content {
    background-color: rgba(255, 255, 255, 0.6); /* More transparent white */
    border-bottom-left-radius: 5px;
    backdrop-filter: blur(10px); /* Add blur effect */
    -webkit-backdrop-filter: blur(10px); /* For Safari compatibility */
    border: 1px solid rgba(255, 255, 255, 0.18); /* Optional: subtle border */
}

.message .sender {
    font-weight: bold;
    margin-bottom: 5px;
    font-size: 0.9em;
    color: #555;
}

.ai-message .sender {
     color: #4a69bd; /* Different color for AI sender */
}

.user-message .sender {
     color: #3a7a3e; /* Different color for User sender */
     /* text-align: right; /* Alignment handled by flexbox now */
}


#input-wrapper {
    display: flex;
    flex-direction: column; /* Stack preview area on top of input area */
    border-top: 1px solid #eee;
    background-color: #f9f9f9;
}

#image-preview-area {
    padding: 10px 15px 5px 15px; /* Padding around the preview */
    position: relative; /* For positioning the remove button */
    max-width: 150px; /* Limit preview width */
    align-self: flex-start; /* Align preview to the left */
}

#image-preview {
    max-width: 100%;
    max-height: 80px; /* Limit preview height */
    border-radius: 4px;
    border: 1px solid #ddd;
    display: block; /* Ensure img behaves like a block */
}

#remove-image-button {
    position: absolute;
    top: 2px;
    right: 2px;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    border: none;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    font-size: 12px;
    line-height: 16px; /* Center the 'x' */
    text-align: center;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

#remove-image-button:hover {
    background-color: rgba(0, 0, 0, 0.8);
}


/* --- Global Input Area Styles (Applies to Desktop & Mobile unless overridden) --- */
#chat-input-area {
    display: flex;
    padding: 10px 15px; /* Consistent padding */
    align-items: stretch; /* Stretch items to match tallest */
    gap: 8px; /* Space between elements */
}

/* Global style for the left button container */
.left-input-buttons {
    display: flex;
    flex-direction: column; /* Stack buttons vertically */
    gap: 4px; /* Space between stacked buttons */
    order: 1; /* This group is the first item */
    flex-shrink: 0;
}

/* Global styles for buttons inside the left vertical group */
.left-input-buttons button {
    padding: 0;
    border-radius: 8px; /* Rounded rectangle */
    height: 32px; /* Smaller height */
    width: 36px;  /* Adjust width */
    font-size: 0.8em; /* Smaller font size */
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    border: none;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

/* Global specific styles for NEW button */
#new-chat-button {
     background-color: #f39c12;
     font-size: 0.7em; /* Even smaller font for "NEW" */
     font-weight: bold;
}
#new-chat-button:hover {
     background-color: #e67e22;
}

/* Styles for Attach button (label) to match NEW button */
#attach-image-button { /* ID selector still works on the label */
    /* --- Copy common styles from .left-input-buttons button --- */
    padding: 0; /* Reset label padding */
    border-radius: 8px; /* Explicitly add rounded rectangle */
    height: 32px; /* Explicitly set height */
    width: 36px;  /* Explicitly set width */
    flex-shrink: 0;
    display: flex; /* Use flex for alignment */
    align-items: center; /* Center content vertically */
    justify-content: center; /* Center content horizontally */
    box-sizing: border-box;
    border: none; /* Remove default label border */
    cursor: pointer;
    transition: background-color 0.3s ease;
    /* --- Copy specific styles from #new-chat-button --- */
    background-color: #f39c12; /* Match NEW button background */
    font-size: 0.7em; /* Match NEW button font size */
    font-weight: bold; /* Match NEW button font weight */
    color: white; /* Explicitly set text color to white */
    /* Note: The text "File" might need a slightly larger font-size than "NEW" */
    /* You can adjust the font-size here if needed, e.g., font-size: 0.8em; */
}
#attach-image-button:hover {
     background-color: #e67e22; /* Match NEW button hover */
}


/* Global styles for message input */
#message-input {
    flex-grow: 1; /* Allow input to take available space */
    order: 2; /* Input field is the second item */
    padding: 8px 12px; /* Keep padding */
    border: 1px solid #ccc;
    border-radius: 18px; /* Keep input radius */
    resize: none;
    /* height: 68px; Removed fixed height, rely on stretch */
    max-height: 80px; /* Limit max height */
    overflow-y: auto;
    font-size: 0.95em; /* Default font size */
    line-height: 1.4;
    box-sizing: border-box; /* Ensure padding/border are included in height calculation */
}

/* Global styles for Send button */
#send-button {
    order: 3; /* Send button is the third item */
    padding: 0 15px; /* Horizontal padding for text */
    /* height: 68px; Removed fixed height, rely on stretch */
    width: auto; /* Auto width based on text */
    border-radius: 18px; /* Match input radius */
    font-size: 0.9em; /* Default font size */
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box; /* Ensure padding/border are included */
    border: none;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
    background-color: #4a90e2;
}
#send-button:hover {
    background-color: #357abd;
}


#ai-buttons {
    margin-top: 10px; /* Add space above AI buttons */
    padding-left: 10px; /* Align with input field */
    display: flex; /* Use flexbox for layout */
    flex-wrap: wrap; /* Allow buttons to wrap */
    gap: 5px; /* Space between buttons */
}

#ai-buttons button {
    padding: 5px 10px;
    border: 1px solid #ccc;
    background-color: #f0f0f0;
    border-radius: 15px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.3s ease;
}

#ai-buttons button:hover {
    background-color: #e0e0e0;
}

/* Style for loading indicator */
.loading-indicator {
    display: inline-block;
    margin-left: 5px;
    width: 10px;
    height: 10px;
    border: 2px solid rgba(0, 0, 0, 0.3);
    border-radius: 50%;
    border-top-color: #000;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Floating AI Status Window Styles */
#floating-ai-status-window {
    position: absolute; /* Changed from fixed to absolute relative to chat-container */
    top: 75px; /* Adjust top position below the header */
    right: 20px; /* Position on the right */
    width: 180px; /* Adjust width as needed */
    max-height: calc(92vh - 100px); /* Adjust max height based on container height and top offset */
    background-color: rgba(255, 255, 255, 0.9); /* Slightly transparent background */
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.15);
    padding: 10px;
    z-index: 100; /* Ensure it's above other elements */
    overflow-y: auto; /* Add scroll if content overflows */
    display: none; /* Initially hidden */
}

#floating-ai-status-window h4 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 0.9em;
    color: #333;
    text-align: center;
    border-bottom: 1px solid #eee;
    padding-bottom: 5px;
}

#current-round-ais {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ai-status-item {
    display: flex;
    align-items: center;
    justify-content: space-between; /* Push button to the right */
    padding: 5px;
    background-color: #f9f9f9;
    border-radius: 4px;
    font-size: 0.85em;
}

.ai-status-item img {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    margin-right: 8px;
    object-fit: cover;
    transition: filter 0.3s ease, opacity 0.3s ease; /* Add transition for smooth greying */
}

.ai-status-item span {
    flex-grow: 1; /* Allow name to take available space */
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ai-status-item .close-ai-btn {
    background-color: #ff6b6b;
    color: white;
    border: none;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    font-size: 11px;
    line-height: 16px;
    text-align: center;
    cursor: pointer;
    padding: 0;
    margin-left: 5px; /* Space between name and button */
    flex-shrink: 0; /* Prevent button from shrinking */
}

.ai-status-item .close-ai-btn:hover {
    background-color: #e05252;
}

/* Style for the X button when AI is excluded for the next round */
.ai-status-item .close-ai-btn.excluded-next-round {
    background-color: #bbb; /* Grey background */
    opacity: 0.6;
    cursor: not-allowed; /* Indicate it's already marked for exclusion */
}

/* Style for inactive AI avatars in the floating window */
.ai-status-item img.inactive-avatar {
    filter: grayscale(80%);
    opacity: 0.5;
}
.ai-status-item .close-ai-btn.excluded-next-round:hover {
     background-color: #aaa; /* Slightly darker grey on hover */
}

.ai-status-item .mute-ai-btn {
    background-color: #ffae42; /* Orange default */
    color: white;
    border: none;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    font-size: 12px;
    font-weight: bold;
    line-height: 16px;
    text-align: center;
    cursor: pointer;
    padding: 0;
    margin-left: 4px; /* Space between close and mute buttons */
    flex-shrink: 0;
    transition: background-color 0.3s ease;
}

.ai-status-item .mute-ai-btn.muted {
    background-color: #888; /* Grey when muted */
    opacity: 0.7;
}

.ai-status-item .mute-ai-btn:hover:not(.muted) {
    background-color: #ff9a1f;
}

.ai-status-item .mute-ai-btn:hover.muted {
    background-color: #666;
}

/* Responsive Design for Mobile Devices */
@media (max-width: 768px) {
    body {
        /* Remove flex centering for mobile, allow natural flow */
        display: block;
        min-height: auto; /* Allow body height to adjust */
        padding: 0; /* Remove default padding if any */
    }

    #chat-container {
        width: 100%;
        max-width: none;
        height: 100vh; /* Full viewport height */
        max-height: none;
        border-radius: 0; /* Remove rounded corners */
        box-shadow: none; /* Remove shadow */
        padding-top: 50px; /* Reduced padding to match the slimmer floating bar */
        margin-left: 0; /* Reset left margin for mobile */
    }

    #chat-header {
        padding: 10px 15px; /* Reduce padding */
        flex-direction: column; /* Stack title and controls */
        align-items: flex-start; /* Align items to the start */
        gap: 8px; /* Reduce gap */
    }

    #chat-header h1 {
        /* Hide the main title on mobile */
        display: none;
    }
    #controls-area {
        width: 100%; /* Take full width */
        justify-content: space-between; /* Space out controls */
        gap: 10px; /* Adjust gap */
    }

    #chat-session-select,
    #config-select { /* Apply to config select too */
        font-size: 0.85em;
        padding: 4px 6px;
        flex-grow: 1; /* Allow selects to grow */
    }

    #ai-status {
        /* Hide the AI status display entirely on small screens */
        display: none;
    }

    #chat-messages {
        padding: 15px; /* Adjust padding */
    }

    .message {
        margin-bottom: 10px; /* Reduce margin */
    }

    .avatar {
        width: 40px; /* Smaller avatar */
        height: 40px;
        margin: 0 8px; /* Adjust margin */
    }

    .message-content {
        padding: 8px 12px; /* Smaller padding */
        max-width: 85%; /* Allow slightly wider bubbles */
        font-size: 0.95em; /* Adjust font size if needed */
    }

    #input-wrapper {
        /* No changes needed unless specific issues arise */
    }

    #image-preview-area {
        padding: 8px 10px 4px 10px;
        max-width: 100px;
    }

    #image-preview {
        max-height: 60px;
    }

    #remove-image-button {
        width: 16px;
        height: 16px;
        font-size: 10px;
        line-height: 14px;
    }

    /* --- Mobile Specific Overrides --- */
    /* Remove redundant layout rules for input area and buttons, as they are now global */

    #chat-input-area {
        /* Mobile inherits flex, stretch, gap */
        padding: 8px 10px; /* Slightly less padding on mobile */
        align-items: flex-end; /* Align items to the bottom */
    }

    .left-input-buttons {
        flex-direction: row; /* Stack buttons horizontally */
    }

    /* Ensure left buttons match Send button's border-radius on mobile */
    .left-input-buttons button {
        border-radius: 18px; /* Match send button radius */
        /* Inherit other styles like height, width from global */
    }
    /* Keep specific mobile style overrides if needed below */
    /* #attach-image-button { ... } */
    /* #new-chat-button { ... } */
    /* Ensure attach button (label) also gets mobile border-radius */
    #attach-image-button {
        border-radius: 18px; /* Match other mobile buttons */
    }


    #message-input {
        /* Mobile inherits flex-grow, order, max-height from global */
        height: 32px; /* Match button height */
        font-size: 0.9em; /* Slightly smaller font on mobile */
        padding: 8px 10px; /* Adjust mobile horizontal padding */
    }

    #send-button {
        /* Mobile inherits order, border-radius, background from global */
        height: 32px; /* Match button height */
        padding: 0 12px; /* Adjust mobile horizontal padding */
        font-size: 0.85em; /* Slightly smaller font on mobile */
    }


    #ai-buttons {
        order: 3; /* Place AI buttons last */
        width: 100%; /* Take full width */
        justify-content: center; /* Center buttons */
        margin-top: 8px;
        padding-left: 0; /* Remove left padding */
    }

    #ai-buttons button {
        padding: 4px 8px;
        font-size: 0.8em;
    }

    #floating-ai-status-window {
        /* --- Mobile Horizontal Bar Style --- */
        display: flex; /* Use flex for layout */
        flex-direction: column; /* Stack title (hidden) and ais */
        position: fixed; /* Float at the top */
        top: 0;
        left: 0;
        right: 0;
        width: 100%;
        height: auto; /* Adjust height based on content */
        min-height: 40px; /* Reduced minimum height */
        background-color: rgba(29, 91, 161, 1); /* Use header color with transparency */
        padding: 5px 10px; /* Reduced padding */
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
        z-index: 101; /* Ensure it's above chat header */
        border-radius: 0; /* No rounded corners */
        overflow-x: auto; /* Allow horizontal scrolling if too many avatars */
        overflow-y: hidden;
        border: none; /* Remove border */
    }

    #floating-ai-status-window h4 {
        /* Hide the title on mobile */
        display: none;
    }

    #current-round-ais {
        /* Arrange items horizontally */
        flex-direction: row;
        justify-content: center; /* Center the avatars */
        gap: 15px; /* Increased space between AI items */
        align-items: center; /* Vertically align items */
        /* gap: 10px; /* Space between AI items - overridden by justify-content? Use margin/padding on items if needed */
        width: 100%; /* Take full width */
        padding: 5px 0; /* Add some vertical padding */
        position: relative; /* Enable positioning */
        left: -10px; /* Move the container 10px to the left */
    }

    .ai-status-item {
        /* Adjust item layout: Avatar on left, buttons stacked vertically on right */
        display: flex; /* Use flex for avatar + button group layout */
        flex-direction: row; /* Avatar and button group side-by-side */
        align-items: center; /* Align avatar and button group vertically */
        background-color: transparent; /* Remove item background */
        gap: 5px; /* Space between avatar and button group */
        padding: 0; /* Remove item padding */
        gap: 3px; /* Small gap between avatar and buttons */
        min-width: 40px; /* Ensure minimum width */
    }

    .ai-status-item span {
        /* Hide the AI name */
        display: none;
    }

    .ai-status-item img {
        /* Adjust avatar size */
        width: 30px;
        height: 30px;
        margin-right: 0; /* Remove margin */
    }

     /* Container for buttons to the right of avatar */
    .ai-status-item .button-group {
        display: flex;
        flex-direction: column; /* Stack buttons vertically */
        gap: 3px; /* Space between buttons */
    }

    .ai-status-item .close-ai-btn,
    .ai-status-item .mute-ai-btn {
        /* Adjust button size and position */
        width: 15px;
        height: 15px;
        font-size: 9px;
        line-height: 14px; /* Adjust line height */
        margin-left: 0; /* Remove margin */
        position: static; /* Override absolute positioning if any */
        border-radius: 3px; /* Slightly rounded corners */
    }

     /* Specific adjustments if needed */
    .ai-status-item .close-ai-btn {
         /* background-color: rgba(255, 107, 107, 0.8); */
    }
    .ai-status-item .mute-ai-btn {
         /* background-color: rgba(255, 174, 66, 0.8); */
    }
    .ai-status-item .mute-ai-btn.muted {
        /* background-color: rgba(136, 136, 136, 0.8); */
    }
}

/* Style for highlighted @mentions */
.mention-highlight {
    color: #007bff; /* Standard blue color */
    font-weight: bold; /* Make it bold */
    background-color: rgba(0, 123, 255, 0.1); /* Optional: subtle background highlight */
    padding: 1px 3px; /* Optional: add some padding */
    border-radius: 3px; /* Optional: rounded corners */
}
/* Generic label styles removed, specific styles applied above */
/* Ensure the hidden file input doesn't affect layout (keep this part) */
#image-input {
    display: none;
}
/* --- Markdown Table Styles --- */
.message-content table {
    border-collapse: collapse; /* 合并单元格边框 */
    width: auto; /* 表格宽度自适应内容，或设为 100% 如果需要 */
    margin-top: 1em; /* 表格上方留白 */
    margin-bottom: 1em; /* 表格下方留白 */
    border: 1px solid rgba(0, 0, 0, 0.2); /* 整体表格外边框，颜色较浅 */
    font-size: 0.95em; /* 调整表格内字体大小 */
}

.message-content th,
.message-content td {
    border: 1px solid rgba(0, 0, 0, 0.15); /* 单元格边框，颜色更浅 */
    padding: 8px 12px; /* 单元格内边距 */
    text-align: left; /* 文本左对齐 */
}

.message-content th {
    background-color: rgba(0, 0, 0, 0.05); /* 表头单元格浅灰色背景 */
    font-weight: bold; /* 表头字体加粗 */
}

/* 可选：为奇数行添加微弱背景色，增加可读性 */
.message-content tr:nth-child(odd) td {
    background-color: rgba(0, 0, 0, 0.02);
}