.canvas-chat {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    width: 100dvw;
    /* 使用动态视口高度，适配移动端地址栏 */
    height: 100vh;
    height: 100dvh;
    height: calc(var(--vh, 1vh) * 100);
    min-height: -webkit-fill-available;
    background-color: rgba(0, 0, 0, 0.85);
    z-index: 2000;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    /* 支持安全区域（刘海屏等） */
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
}

.canvas-chat--visible {
    display: flex;
    opacity: 1;
}

.canvas-chat__container {
    position: relative;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    max-width: 95vw;
    max-width: 95dvw;
    /* 使用动态视口高度 */
    max-height: 90vh;
    max-height: 90dvh;
    max-height: calc(var(--vh, 1vh) * 90);
    display: flex;
    flex-direction: column;
    /* 移除固定的 width 和 height，让内容撑开 */
}

/* 移动端优化 */
@media (max-width: 640px) {
    .canvas-chat__container {
        max-width: 100vw;
        max-width: 100dvw;
        max-height: 100vh;
        max-height: 100dvh;
        max-height: calc(var(--vh, 1vh) * 100);
        border-radius: 0;
        /* 考虑安全区域 */
        margin-top: env(safe-area-inset-top, 0px);
        margin-bottom: env(safe-area-inset-bottom, 0px);
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .canvas-chat__container {
        background-color: #1e1e1e;
        border: 1px solid #333;
    }
}

.canvas-chat__header {
    padding: 10px 15px;
    background-color: #f5f5f5;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media (prefers-color-scheme: dark) {
    .canvas-chat__header {
        background-color: #2d2d2d;
        border-bottom-color: #444;
    }
}

.canvas-chat__title {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

@media (prefers-color-scheme: dark) {
    .canvas-chat__title {
        color: #ddd;
    }
}

.canvas-chat__status {
    font-size: 12px;
    color: #666;
    margin-left: 10px;
}

@media (prefers-color-scheme: dark) {
    .canvas-chat__status {
        color: #aaa;
    }
}

.canvas-chat__close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #666;
    padding: 0;
    line-height: 1;
    transition: color 0.2s;
}

.canvas-chat__close:hover {
    color: #d32f2f;
}

@media (prefers-color-scheme: dark) {
    .canvas-chat__close {
        color: #aaa;
    }
    .canvas-chat__close:hover {
        color: #ff5252;
    }
}

.canvas-chat__body {
    position: relative;
    background-color: #fff;
    cursor: crosshair;
    overflow: hidden;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
}

@media (prefers-color-scheme: dark) {
    .canvas-chat__body {
        background-color: #121212;
    }
}

.canvas-chat__canvas {
    display: block;
    touch-action: none; /* Prevent scrolling on touch devices */
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    background-color: #fff;
}

@media (prefers-color-scheme: dark) {
    .canvas-chat__canvas {
        border-color: #444;
        background-color: #1e1e1e;
    }
}

.canvas-chat__toolbar {
    padding: 10px;
    background-color: #f5f5f5;
    border-top: 1px solid #e0e0e0;
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

@media (prefers-color-scheme: dark) {
    .canvas-chat__toolbar {
        background-color: #2d2d2d;
        border-top-color: #444;
    }
}

.canvas-chat__tool-btn {
    width: 30px;
    height: 30px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    color: #333;
}

@media (prefers-color-scheme: dark) {
    .canvas-chat__tool-btn {
        background-color: #333;
        border-color: #555;
        color: #ddd;
    }
}

.canvas-chat__tool-btn:hover {
    background-color: #e0e0e0;
}

.canvas-chat__tool-btn--active {
    background-color: #2196f3;
    color: #fff;
    border-color: #1976d2;
}

@media (prefers-color-scheme: dark) {
    .canvas-chat__tool-btn:hover {
        background-color: #444;
    }
    .canvas-chat__tool-btn--active {
        background-color: #1565c0;
        border-color: #0d47a1;
    }
}

.canvas-chat__color-picker {
    width: 30px;
    height: 30px;
    padding: 0;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background: none;
}

.canvas-chat__size-slider {
    width: 100px;
    cursor: pointer;
}

/* Command suggestion popup in chat input */
.group-chat__commands {
    position: absolute;
    bottom: 100%;
    left: 0;
    width: 100%;
    background-color: #fff;
    border-top: 1px solid #ddd;
    border-bottom: 1px solid #ddd;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    display: none;
    z-index: 10;
}

@media (prefers-color-scheme: dark) {
    .group-chat__commands {
        background-color: #2d2d2d;
        border-color: #444;
    }
}

.group-chat__commands--visible {
    display: block;
}

.group-chat__command-item {
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    color: #333;
}

@media (prefers-color-scheme: dark) {
    .group-chat__command-item {
        color: #ddd;
    }
}

.group-chat__command-item:hover {
    background-color: #f5f5f5;
}

@media (prefers-color-scheme: dark) {
    .group-chat__command-item:hover {
        background-color: #3e3e3e;
    }
}

.group-chat__command-name {
    font-weight: bold;
    color: #2196f3;
}

.group-chat__command-desc {
    color: #888;
    font-size: 12px;
}