/* --- 全局样式和 Kite 风格变量 --- */
:root {
    --primary-blue: #387ed1;
    --primary-blue-darker: #316ab7;
    --text-dark: #2c3e50;
    --text-light: #5a6b7b;
    --border-color: #e0e6ed;
    --background-light: #f8f9fa;
    --background-white: #ffffff;
    --success-green: #27ae60;
    --warning-orange: #f39c12;
    --danger-red: #e74c3c;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 1px 3px rgba(0,0,0,0.06);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* --- 新增：背景图片设置 --- */
    background-image: url('background-image.jpg');
    background-size: cover; /* 让图片完全覆盖整个背景区域，可能会裁剪图片 */
    background-position: center center; /* 将图片在视口中居中 */
    background-repeat: no-repeat; /* 防止图片平铺重复 */
    background-attachment: fixed; /* 这是关键，使背景图片固定，内容滚动时背景不动 */
    
    /* --- 保留一个备用背景色，以防图片加载失败 --- */
    background-color: var(--background-light);
    
    margin: 0;
    padding: 40px 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    color: var(--text-dark);
}

/* --- 主容器卡片样式 (磨砂玻璃效果) --- */
.container {
    /* 使用带透明度的白色作为背景 */
    background-color: rgba(255, 255, 255, 0.85); 
    
    /* 关键：添加背景模糊滤镜，实现磨砂效果 */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px); /* 兼容 Safari */

    padding: 40px;
    border-radius: 16px; /* 可以让圆角更明显一些 */
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 650px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.4); /* 使用半透明边框 */
}

/* --- 标题和头部 --- */
h1 {
    font-weight: 700;
    font-size: 28px;
    margin-bottom: 10px;
}

h2 {
    font-size: 20px;
    font-weight: 500;
    color: var(--text-dark);
    text-align: left;
    margin: 40px 0 15px 0;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

p {
    color: var(--text-light);
    margin-bottom: 30px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

header h1 {
    margin: 0;
    font-size: 24px;
}

/* --- 表单元素（输入框和按钮） --- */
input[type="text"] {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 16px;
    background-color: #fafbfc;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(56, 126, 209, 0.2);
}

form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

form input {
    flex-grow: 1;
}

button {
    background-color: var(--primary-blue);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.3s, transform 0.2s;
}

button:hover {
    background-color: var(--primary-blue-darker);
    transform: translateY(-1px);
}

#logout-btn {
    background: none;
    color: var(--text-light);
    padding: 5px;
    font-weight: normal;
}

#logout-btn:hover {
    background: none;
    color: var(--danger-red);
    transform: none;
}


/* --- 任务列表样式 --- */
.lists-container {
    text-align: left;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    background-color: var(--background-white);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    word-break: break-all;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s, transform 0.3s, border-color 0.3s;
}

li:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: #c8d4e1;
}

li.completed {
    opacity: 0.6;
}

li.completed span {
    text-decoration: line-through;
    color: var(--text-light);
}

/* --- 任务内的操作按钮 --- */
li .actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 15px; /* 与文字隔开 */
}

li .actions button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 20px;
    padding: 5px;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}
li .actions button:hover {
    background-color: #f0f2f5;
    transform: none;
}

li .actions .complete-btn {
    color: var(--success-green);
}

li.completed .actions .complete-btn {
    color: var(--warning-orange);
}

li .actions .delete-btn {
    color: var(--danger-red);
}

li .time-info {
    display: block;
    font-size: 12px;
    color: #888;
    margin-top: 6px;
    text-align: left;
}