:root {
    --sidebar-width: 250px;
    --primary-blue: #007bff;
}

body { 
    font-size: 0.9rem; 
    background-color: #f8f9fa; 
    overflow-x: hidden; 
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* === 输入框与提示文本样式 === */
/* 强制覆盖 Bootstrap 默认样式以匹配原项目风格 */
::placeholder { color: #aaaaaa !important; opacity: 1; }
.text-muted { color: #999999 !important; }
.form-text { color: #999999 !important; }

.form-control, .form-select {
    font-size: 0.9rem;
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
    outline: none;
}

/* === 布局结构 === */
#wrapper {
    display: flex;
    width: 100%;
    align-items: stretch;
}

/* 侧边栏 */
#sidebar-wrapper {
    min-width: var(--sidebar-width);
    max-width: var(--sidebar-width);
    background: #343a40; /* 深色背景 */
    color: #fff;
    min-height: 100vh;
    border-right: 1px solid rgba(0,0,0,0.1);
    position: fixed; /* 固定在左侧 */
    z-index: 1000;
}

.sidebar-heading {
    padding: 1.5rem;
    font-size: 1.2rem;
    font-weight: bold;
    text-align: center;
    background: rgba(0,0,0,0.1);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

#sidebar-wrapper .list-group-item {
    background-color: transparent;
    color: #ced4da;
    border: none;
    padding: 1rem 1.5rem;
    border-left: 4px solid transparent;
    border-radius: 0;
}

#sidebar-wrapper .list-group-item:hover {
    background-color: rgba(255,255,255,0.05);
    color: #fff;
}

#sidebar-wrapper .list-group-item.active {
    background-color: rgba(255,255,255,0.1);
    color: #fff;
    border-left-color: var(--primary-blue);
    font-weight: bold;
}

/* 主内容区域 */
#page-content-wrapper {
    width: 100%;
    padding: 20px;
    margin-left: var(--sidebar-width); /* 让出侧边栏位置 */
    background-color: #f8f9fa;
}

/* 内容板块切换 */
.content-section { 
    display: none; 
    animation: fadeIn 0.3s ease-in-out;
}
.content-section.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.content-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #333;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 10px;
}

/* === 收件箱分栏布局 (Split View) === */
.split-view { 
    display: flex; 
    height: calc(100vh - 80px); /* 减去顶部padding */
    background: #fff;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.col-c { 
    width: 320px; 
    border-right: 1px solid #dee2e6; 
    background: #f8f9fa; 
    display: flex; 
    flex-direction: column;
}

.col-d { 
    flex: 1; 
    background: #fff; 
    overflow-y: auto; 
    position: relative;
}

/* 左侧账号列表项样式 */
#inbox-account-list .list-group-item {
    border-left: 3px solid transparent;
    border-radius: 0;
    margin-bottom: 0;
    border-right: none;
    border-top: none;
    border-bottom: 1px solid #e9ecef;
}

#inbox-account-list .list-group-item.active {
    background-color: #fff;
    color: var(--primary-blue);
    border-left-color: var(--primary-blue);
    font-weight: 600;
    z-index: 1;
}

/* === 登录遮罩 === */
#login-overlay {
    position: fixed; 
    top: 0; left: 0; width: 100%; height: 100%;
    background: #e9ecef; 
    z-index: 9999; 
    display: flex;
    align-items: center; 
    justify-content: center;
}

/* === 表格与工具样式 === */
.text-truncate-cell {
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: inline-block;
    vertical-align: middle;
}

.api-config-cell {
    font-family: monospace;
    font-size: 0.8rem;
    color: #666;
    max-width: 250px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cursor-pointer { cursor: pointer; }

/* === Toast 提示 === */
#mouse-toast {
    position: absolute;
    background: rgba(0, 0, 0, 0.85);
    color: white;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.85rem;
    pointer-events: none;
    z-index: 10000;
    display: none;
    white-space: nowrap;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

/* 按钮微调 */
.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}