/* 全局重置 */
* { margin:0; padding:0; box-sizing:border-box; }
body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: #f5f7fa;
    color: #333;
}

/* 登录页 */
.login-container {
    max-width: 420px;
    margin: 100px auto;
    padding: 30px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.08);
    text-align: center;
}
.login-container h1 {
    font-size: 24px;
    margin-bottom: 30px;
    color: #2c3e50;
}
.login-box input {
    width: 100%;
    padding: 12px;
    margin-bottom: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
}
.login-box button {
    width: 100%;
    padding: 12px;
    background: #3498db;
    border: none;
    color: white;
    font-size: 18px;
    border-radius: 6px;
    cursor: pointer;
}
.login-box button:hover { background: #2980b9; }
.error { color: #e74c3c; margin-top: 10px; }
.scroll-area {
    margin-top: 30px;
    background: #fef9e7;
    padding: 10px;
    border-radius: 8px;
    overflow: hidden;
    white-space: nowrap;
}
.scroll-area marquee {
    font-size: 18px;
    color: #e67e22;
}

/* 后台通用 */
.header {
    background: #2c3e50;
    color: white;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.header .logo { font-size: 22px; font-weight: bold; }
.header .user-info a {
    color: #ecf0f1;
    margin-left: 20px;
    text-decoration: none;
}
.header .user-info a:hover { text-decoration: underline; }

.nav {
    background: #34495e;
    padding: 0 30px;
    display: flex;
}
.nav a {
    padding: 12px 20px;
    color: #ecf0f1;
    text-decoration: none;
    transition: background 0.2s;
}
.nav a:hover, .nav a.active {
    background: #2c3e50;
    border-bottom: 3px solid #3498db;
}

.container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}
.stats {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
}
.stat-card {
    background: white;
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    flex: 1;
    font-size: 18px;
    text-align: center;
}

.sections {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}
.section {
    flex: 1;
    min-width: 250px;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.section h3 {
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 10px;
    margin-bottom: 15px;
    color: #2c3e50;
}
.section ul {
    list-style: none;
}
.section ul li {
    padding: 8px 0;
    border-bottom: 1px solid #f5f5f5;
}
.empty { color: #999; font-style: italic; }

.search-box {
    margin-top: 30px;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    display: flex;
    gap: 10px;
}
.search-box input[type="text"] {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
}
.search-box button {
    padding: 10px 25px;
    background: #27ae60;
    border: none;
    color: white;
    border-radius: 6px;
    cursor: pointer;
}
.search-box button:hover { background: #219a52; }

/* 表单卡片 */
.form-card {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}
.form-card input, .form-card select, .form-card textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
}
.form-card textarea { height: 60px; }
.form-card button {
    background: #2980b9;
    color: white;
    border: none;
    padding: 10px 30px;
    border-radius: 6px;
    cursor: pointer;
}
.form-card button:hover { background: #1f618d; }

.list-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.list-card table {
    width: 100%;
    border-collapse: collapse;
}
.list-card th, .list-card td {
    padding: 10px 8px;
    text-align: left;
    border-bottom: 1px solid #ecf0f1;
}
.list-card th { background: #f8f9fa; }
.list-card a {
    color: #e74c3c;
    text-decoration: none;
    margin-right: 10px;
}
.list-card a:hover { text-decoration: underline; }

.msg { padding: 12px; border-radius: 6px; margin-bottom: 20px; }
.success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* 共享多选 */
#share_users { margin-top: 10px; }
#share_users select { height: 80px; }

/* ========== 移动端适配（宽度 ≤ 768px） ========== */
@media (max-width: 768px) {
    /* 全局调整 */
    body {
        font-size: 15px;
        padding: 0 10px;
    }
    .container {
        padding: 0 5px;
    }

    /* 头部：LOGO和用户信息换行 */
    .header {
        flex-wrap: wrap;
        padding: 10px 15px;
    }
    .header .logo {
        font-size: 18px;
        width: 100%;
        margin-bottom: 5px;
        text-align: center;
    }
    .header .user-info {
        width: 100%;
        text-align: center;
        font-size: 14px;
        display: flex;
        justify-content: center;
        gap: 12px;
    }
    .header .user-info a {
        margin: 0;
    }

    /* 导航：变为可折叠的汉堡菜单 */
    .nav {
        flex-wrap: wrap;
        padding: 0;
        position: relative;
    }
    .nav a {
        display: none; /* 默认隐藏 */
        width: 100%;
        padding: 12px 15px;
        border-bottom: 1px solid #2c3e50;
        text-align: center;
        font-size: 16px;
    }
    .nav a.active {
        display: block; /* 当前页保持可见，但仅此一个，我们需要显示所有项 */
        /* 但实际我们要显示所有，所以用JS控制显示全部 */
    }
    /* 汉堡按钮 */
    .nav-toggle {
        display: block;
        background: #34495e;
        color: white;
        padding: 12px 20px;
        font-size: 20px;
        cursor: pointer;
        text-align: center;
        width: 100%;
        border: none;
        outline: none;
    }
    .nav-toggle:hover {
        background: #2c3e50;
    }
    /* 展开状态 */
    .nav.open a {
        display: block;
    }

    /* 统计卡片堆叠 */
    .stats {
        flex-direction: column;
        gap: 10px;
    }
    .stat-card {
        padding: 15px;
        font-size: 16px;
    }

    /* 三栏布局改为单栏 */
    .sections {
        flex-direction: column;
        gap: 15px;
    }
    .section {
        min-width: 0;
    }

    /* 表格：横向滚动 */
    .list-card {
        overflow-x: auto;
    }
    .list-card table {
        font-size: 13px;
        min-width: 600px; /* 保证内容可读，超出滚动 */
    }
    .list-card th, .list-card td {
        padding: 6px 5px;
        white-space: nowrap;
    }

    /* 搜索框 */
    .search-box {
        flex-direction: column;
        gap: 8px;
    }
    .search-box input[type="text"] {
        width: 100%;
    }
    .search-box button {
        width: 100%;
    }

    /* 表单卡片 */
    .form-card {
        padding: 15px;
    }
    .form-card input, .form-card select, .form-card textarea {
        font-size: 16px; /* 防止iOS缩放 */
        padding: 12px 8px;
        height: 44px;
    }
    .form-card textarea {
        height: 80px;
    }
    .form-card button {
        width: 100%;
        padding: 12px;
        font-size: 18px;
    }

    /* 复选框网格：手机上一列 */
    .checkbox-grid label {
        width: 100% !important;
        white-space: normal;
    }

    /* 内联组换行 */
    .inline-group {
        flex-direction: column;
        align-items: stretch;
        gap: 6px;
    }
    .inline-group select {
        width: 100%;
    }

    /* 分页 */
    .pagination {
        flex-wrap: wrap;
        justify-content: center;
    }
    .pagination a, .pagination span {
        padding: 8px 12px;
        font-size: 14px;
    }

    /* 登录页 */
    .login-container {
        margin: 40px auto;
        padding: 20px;
    }
    .login-box input, .login-box button {
        font-size: 16px;
        padding: 14px;
    }
    .scroll-area {
        font-size: 16px;
        padding: 12px;
    }
}

/* 更小屏（≤480px）再优化 */
@media (max-width: 480px) {
    .header .user-info {
        flex-direction: column;
        gap: 4px;
    }
    .list-card table {
        font-size: 12px;
        min-width: 500px;
    }
    .checkbox-grid label {
        width: 100% !important;
    }
}