body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 400px;
    margin: 40px auto;
    background: #fff;
    padding: 24px 32px 32px 32px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
h1 {
    text-align: center;
    color: #333;
}
#todo-form {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}
#todo-input {
    flex: 1;
    padding: 8px;
    border: 1px solid #bbb;
    border-radius: 4px;
    font-size: 16px;
}
#todo-form button {
    padding: 8px 16px;
    background: #4caf50;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s;
}
#todo-form button:hover {
    background: #388e3c;
}
#todo-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.todo-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}
.todo-item:last-child {
    border-bottom: none;
}
.todo-text {
    flex: 1;
    font-size: 16px;
    color: #222;
}
.todo-timer {
    margin-left: 12px;
    font-size: 14px;
    color: #888;
    min-width: 70px;
    text-align: right;
}
.complete-btn {
    margin-left: 12px;
    background: #2196f3;
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 4px 10px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}
.complete-btn:hover {
    background: #1565c0;
}
.completed .todo-text {
    text-decoration: line-through;
    color: #aaa;
}
.completed .todo-timer {
    color: #4caf50;
}