/* ui/styles.css */
:root {
    --bg-color: #f3f4f6;
    --sidebar-bg: #1f2937;
    --sidebar-text: #d1d5db;
    --sidebar-active: #111827;
    --sidebar-active-text: #ffffff;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --white: #ffffff;
    --danger: #ef4444;
    --success: #10b981;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
}

/* 布局：左侧导航 + 右侧内容 */
#app-layout {
    display: flex;
    width: 100%;
}

/* 侧边栏 */
#sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.brand {
    padding: 20px;
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--white);
    border-bottom: 1px solid #374151;
}

.nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
    flex: 1;
}

.nav-item a {
    display: block;
    padding: 12px 20px;
    color: inherit;
    text-decoration: none;
    transition: background 0.2s;
}

.nav-item a:hover {
    background-color: rgba(255,255,255,0.05);
    color: var(--white);
}

.nav-item a.active {
    background-color: var(--sidebar-active);
    color: var(--sidebar-active-text);
    border-left: 4px solid var(--primary);
}

/* 右侧主内容区 */
#main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

/* 通用组件 */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.card {
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 20px;
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: background 0.2s;
}

.btn-primary { background-color: var(--primary); color: white; }
.btn-primary:hover { background-color: var(--primary-hover); }

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: 12px;
    border-bottom: 2px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
}

td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

/* 状态徽章 */
.badge {
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-draft { background: #f3f4f6; color: #374151; }
.badge-sending { background: #dbeafe; color: #1e40af; }
.badge-finished { background: #d1fae5; color: #065f46; }
.badge-failed { background: #fee2e2; color: #991b1b; }

/* --- 追加到 ui/styles.css 末尾 --- */

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    box-sizing: border-box; /* 关键：防止padding撑大宽度 */
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
    font-family: monospace; /* 写HTML代码时等宽字体更好看 */
}

.form-row {
    display: flex;
    gap: 20px;
}

.form-col {
    flex: 1;
}

/* 帮助提示文本 */
.form-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 5px;
}

/* 预览区域样式 */
.preview-box {
    background: #f9fafb;
    border: 1px dashed var(--border);
    padding: 15px;
    border-radius: 6px;
    margin-top: 10px;
}